#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#define IS(w, y) !strcmp(w, y)
+#define IS_START(w, y) !strncmp(w, y, strlen(y))
#include "protoparse.h"
-const char *asmfn;
+static const char *asmfn;
static int asmln;
+static FILE *g_fhdr;
#define anote(fmt, ...) \
printf("%s:%d: note: " fmt, asmfn, asmln, ##__VA_ARGS__)
OPF_JMP = (1 << 3), /* branches, ret and call */
OPF_CC = (1 << 4), /* uses flags */
OPF_TAIL = (1 << 5), /* ret or tail call */
- OPF_REP = (1 << 6), /* prefixed by rep */
+ OPF_RSAVE = (1 << 6), /* push/pop is local reg save/load */
+ OPF_REP = (1 << 7), /* prefixed by rep */
+ OPF_REPZ = (1 << 8), /* rep is repe/repz */
+ OPF_REPNZ = (1 << 9), /* rep is repne/repnz */
+ OPF_FARG = (1 << 10), /* push collected as func arg (no reuse) */
+ OPF_EBP_S = (1 << 11), /* ebp used as scratch, not BP */
};
enum op_op {
OP_NOT,
OP_CDQ,
OP_STOS,
+ OP_MOVS,
+ OP_CMPS,
OP_RET,
OP_ADD,
OP_SUB,
OP_SHL,
OP_SHR,
OP_SAR,
+ OP_ROL,
+ OP_ROR,
OP_ADC,
OP_SBB,
OP_INC,
OPT_CONST,
};
+// must be sorted (larger len must be further in enum)
enum opr_lenmod {
OPLM_UNSPEC,
OPLM_BYTE,
struct parsed_opr {
enum opr_type type;
enum opr_lenmod lmod;
+ unsigned int is_ptr:1; // pointer in C
+ unsigned int is_array:1; // array in C
+ unsigned int type_from_var:1; // .. in header, sometimes wrong
+ unsigned int size_mismatch:1; // type override differs from C
+ unsigned int size_lt:1; // type override is larger than C
int reg;
unsigned int val;
char name[256];
int regmask_src; // all referensed regs
int regmask_dst;
int pfomask; // flagop: parsed_flag_op that can't be delayed
- int argmask; // push: args that are altered before call
+ int argnum; // push: altered before call arg #
int cc_scratch; // scratch storage during analysis
- int bt_i; // branch target (for branches)
- struct parsed_op *lrl; // label reference list entry
+ int bt_i; // branch target for branches
+ struct parsed_data *btj;// branch targets for jumptables
void *datap;
};
// datap:
// OP_CALL - ptr to parsed_proto
-// (OPF_CC) - point to corresponding (OPF_FLAGS)
+// (OPF_CC) - point to one of (OPF_FLAGS) that affects cc op
struct parsed_equ {
char name[64];
int offset;
};
-#define MAX_OPS 1024
+struct parsed_data {
+ char label[256];
+ enum opr_type type;
+ enum opr_lenmod lmod;
+ int count;
+ int count_alloc;
+ struct {
+ union {
+ char *label;
+ unsigned int val;
+ } u;
+ int bt_i;
+ } *d;
+};
+
+struct label_ref {
+ int i;
+ struct label_ref *next;
+};
+
+enum ida_func_attr {
+ IDAFA_BP_FRAME = (1 << 0),
+ IDAFA_LIB_FUNC = (1 << 1),
+ IDAFA_STATIC = (1 << 2),
+ IDAFA_NORETURN = (1 << 3),
+ IDAFA_THUNK = (1 << 4),
+ IDAFA_FPD = (1 << 5),
+};
+
+#define MAX_OPS 4096
static struct parsed_op ops[MAX_OPS];
static struct parsed_equ *g_eqs;
static int g_eqcnt;
static char g_labels[MAX_OPS][32];
-static struct parsed_op *g_label_refs[MAX_OPS];
-static struct parsed_proto g_func_pp;
+static struct label_ref g_label_refs[MAX_OPS];
+static const struct parsed_proto *g_func_pp;
+static struct parsed_data *g_func_pd;
+static int g_func_pd_cnt;
static char g_func[256];
static char g_comment[256];
static int g_bp_frame;
-static int g_bp_stack;
+static int g_sp_frame;
+static int g_stack_fsz;
+static int g_ida_func_attr;
#define ferr(op_, fmt, ...) do { \
- printf("error:%s:#%ld: '%s': " fmt, g_func, (op_) - ops, \
+ printf("error:%s:#%zd: '%s': " fmt, g_func, (op_) - ops, \
dump_op(op_), ##__VA_ARGS__); \
fcloseall(); \
exit(1); \
} while (0)
+#define fnote(op_, fmt, ...) \
+ printf("error:%s:#%zd: '%s': " fmt, g_func, (op_) - ops, \
+ dump_op(op_), ##__VA_ARGS__)
#define MAX_REGS 8
return -1;
}
-static void printf_number(char *buf, size_t buf_size, long number)
+static void printf_number(char *buf, size_t buf_size,
+ unsigned long number)
{
// output in C-friendly form
snprintf(buf, buf_size, number < 10 ? "%lu" : "0x%02lx", number);
return -1;
}
-static long parse_number(const char *number)
+static unsigned long parse_number(const char *number)
{
int len = strlen(number);
const char *p = number;
char *endp = NULL;
+ unsigned long ret;
int neg = 0;
int bad;
- long ret;
if (*p == '-') {
neg = 1;
if (len > 1 && *p == '0')
p++;
if (number[len - 1] == 'h') {
- ret = strtol(p, &endp, 16);
+ ret = strtoul(p, &endp, 16);
bad = (*endp != 'h');
}
else {
- ret = strtol(p, &endp, 10);
+ ret = strtoul(p, &endp, 10);
bad = (*endp != 0);
}
if (bad)
*d = 0;
// skip 'ds:' prefix
- if (!strncmp(s, "ds:", 3))
+ if (IS_START(s, "ds:"))
s += 3;
s = next_idt(w, sizeof(w), s);
return c;
}
+static int is_reg_in_str(const char *s)
+{
+ int i;
+
+ if (strlen(s) < 3 || (s[3] && !my_issep(s[3]) && !my_isblank(s[3])))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(regs_r32); i++)
+ if (!strncmp(s, regs_r32[i], 3))
+ return 1;
+
+ return 0;
+}
+
+static const char *parse_stack_el(const char *name, char *extra_reg)
+{
+ const char *p, *p2, *s;
+ char *endp = NULL;
+ char buf[32];
+ long val;
+ int len;
+
+ p = name;
+ if (IS_START(p + 3, "+ebp+") && is_reg_in_str(p)) {
+ p += 4;
+ if (extra_reg != NULL) {
+ strncpy(extra_reg, name, 3);
+ extra_reg[4] = 0;
+ }
+ }
+
+ if (IS_START(p, "ebp+")) {
+ p += 4;
+
+ p2 = strchr(p, '+');
+ if (p2 != NULL && is_reg_in_str(p)) {
+ if (extra_reg != NULL) {
+ strncpy(extra_reg, p, p2 - p);
+ extra_reg[p2 - p] = 0;
+ }
+ p = p2 + 1;
+ }
+
+ if (!('0' <= *p && *p <= '9'))
+ return p;
+
+ return NULL;
+ }
+
+ if (!IS_START(name, "esp+"))
+ return NULL;
+
+ p = strchr(name + 4, '+');
+ if (p) {
+ // must be a number after esp+, already converted to 0x..
+ s = name + 4;
+ if (!('0' <= *s && *s <= '9')) {
+ aerr("%s nan?\n", __func__);
+ return NULL;
+ }
+ if (s[0] == '0' && s[1] == 'x')
+ s += 2;
+ len = p - s;
+ if (len < sizeof(buf) - 1) {
+ strncpy(buf, s, len);
+ buf[len] = 0;
+ val = strtol(buf, &endp, 16);
+ if (val == 0 || *endp != 0) {
+ aerr("%s num parse fail for '%s'\n", __func__, buf);
+ return NULL;
+ }
+ }
+ p++;
+ }
+ else
+ p = name + 4;
+
+ if ('0' <= *p && *p <= '9')
+ return NULL;
+
+ return p;
+}
+
static int guess_lmod_from_name(struct parsed_opr *opr)
{
if (!strncmp(opr->name, "dword_", 6)) {
return 0;
}
+static int guess_lmod_from_c_type(enum opr_lenmod *lmod,
+ const struct parsed_type *c_type)
+{
+ static const char *dword_types[] = {
+ "int", "_DWORD", "UINT_PTR",
+ "DWORD", "HANDLE", "HWND", "HMODULE",
+ "WPARAM", "LPARAM", "UINT",
+ };
+ static const char *word_types[] = {
+ "uint16_t", "int16_t",
+ "unsigned __int16", "__int16",
+ };
+ static const char *byte_types[] = {
+ "uint8_t", "int8_t", "char",
+ "unsigned __int8", "__int8", "BYTE",
+ "_UNKNOWN",
+ };
+ const char *n;
+ int i;
+
+ if (c_type->is_ptr) {
+ *lmod = OPLM_DWORD;
+ return 1;
+ }
+
+ n = skip_type_mod(c_type->name);
+
+ for (i = 0; i < ARRAY_SIZE(dword_types); i++) {
+ if (IS(n, dword_types[i])) {
+ *lmod = OPLM_DWORD;
+ return 1;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(word_types); i++) {
+ if (IS(n, word_types[i])) {
+ *lmod = OPLM_WORD;
+ return 1;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(byte_types); i++) {
+ if (IS(n, byte_types[i])) {
+ *lmod = OPLM_BYTE;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static enum opr_type lmod_from_directive(const char *d)
+{
+ if (IS(d, "dd"))
+ return OPLM_DWORD;
+ else if (IS(d, "dw"))
+ return OPLM_WORD;
+ else if (IS(d, "db"))
+ return OPLM_BYTE;
+
+ aerr("unhandled directive: '%s'\n", d);
+ return OPLM_UNSPEC;
+}
+
static void setup_reg_opr(struct parsed_opr *opr, int reg, enum opr_lenmod lmod,
int *regmask)
{
*regmask |= 1 << reg;
}
-static struct parsed_equ *equ_find(struct parsed_op *po, const char *name);
+static struct parsed_equ *equ_find(struct parsed_op *po, const char *name,
+ int *extra_offs);
static int parse_operand(struct parsed_opr *opr,
int *regmask, int *regmask_indirect,
- char words[16][256], int wordc, int w, unsigned int op_flags)
+ char words[16][256], int wordc, int w, unsigned int op_flags)
{
+ const struct parsed_proto *pp;
enum opr_lenmod tmplmod;
+ unsigned long number;
int ret, len;
- long number;
+ int wordc_in;
+ char *tmp;
int i;
- if (w >= wordc)
- aerr("parse_operand w %d, wordc %d\n", w, wordc);
+ if (w >= wordc)
+ aerr("parse_operand w %d, wordc %d\n", w, wordc);
- opr->reg = xUNSPEC;
+ opr->reg = xUNSPEC;
- for (i = w; i < wordc; i++) {
- len = strlen(words[i]);
- if (words[i][len - 1] == ',') {
- words[i][len - 1] = 0;
- wordc = i + 1;
- break;
- }
- }
+ for (i = w; i < wordc; i++) {
+ len = strlen(words[i]);
+ if (words[i][len - 1] == ',') {
+ words[i][len - 1] = 0;
+ wordc = i + 1;
+ break;
+ }
+ }
- if (op_flags & OPF_JMP) {
- const char *label;
-
- if (wordc - w == 3 && IS(words[w + 1], "ptr"))
- label = words[w + 2];
- else if (wordc - w == 2 && IS(words[w], "short"))
- label = words[w + 1];
- else if (wordc - w == 1)
- label = words[w];
- else
- aerr("jump parse error");
-
- opr->type = OPT_LABEL;
- strcpy(opr->name, label);
- return wordc;
- }
+ wordc_in = wordc - w;
- if (wordc - w >= 3) {
- if (IS(words[w + 1], "ptr")) {
- if (IS(words[w], "dword"))
- opr->lmod = OPLM_DWORD;
- else if (IS(words[w], "word"))
- opr->lmod = OPLM_WORD;
- else if (IS(words[w], "byte"))
- opr->lmod = OPLM_BYTE;
- else
- aerr("type parsing failed\n");
- w += 2;
- }
- }
+ if ((op_flags & OPF_JMP) && wordc_in > 0
+ && !('0' <= words[w][0] && words[w][0] <= '9'))
+ {
+ const char *label = NULL;
+
+ if (wordc_in == 3 && !strncmp(words[w], "near", 4)
+ && IS(words[w + 1], "ptr"))
+ label = words[w + 2];
+ else if (wordc_in == 2 && IS(words[w], "short"))
+ label = words[w + 1];
+ else if (wordc_in == 1
+ && strchr(words[w], '[') == NULL
+ && parse_reg(&tmplmod, words[w]) < 0)
+ label = words[w];
+
+ if (label != NULL) {
+ opr->type = OPT_LABEL;
+ if (IS_START(label, "ds:"))
+ label += 3;
+ strcpy(opr->name, label);
+ return wordc;
+ }
+ }
- if (wordc - w == 2 && IS(words[w], "offset")) {
- opr->type = OPT_OFFSET;
- strcpy(opr->name, words[w + 1]);
- return wordc;
- }
+ if (wordc_in >= 3) {
+ if (IS(words[w + 1], "ptr")) {
+ if (IS(words[w], "dword"))
+ opr->lmod = OPLM_DWORD;
+ else if (IS(words[w], "word"))
+ opr->lmod = OPLM_WORD;
+ else if (IS(words[w], "byte"))
+ opr->lmod = OPLM_BYTE;
+ else
+ aerr("type parsing failed\n");
+ w += 2;
+ wordc_in = wordc - w;
+ }
+ }
+
+ if (wordc_in == 2) {
+ if (IS(words[w], "offset")) {
+ opr->type = OPT_OFFSET;
+ strcpy(opr->name, words[w + 1]);
+ return wordc;
+ }
+ if (IS(words[w], "(offset")) {
+ char *p = strchr(words[w + 1], ')');
+ if (p == NULL)
+ aerr("parse of bracketed offset failed\n");
+ *p = 0;
+ opr->type = OPT_OFFSET;
+ strcpy(opr->name, words[w + 1]);
+ return wordc;
+ }
+ }
- if (wordc - w != 1)
+ if (wordc_in != 1)
aerr("parse_operand 1 word expected\n");
- strcpy(opr->name, words[w]);
+ tmp = words[w];
+ if (IS_START(tmp, "ds:"))
+ tmp += 3;
+ strcpy(opr->name, tmp);
if (words[w][0] == '[') {
opr->type = OPT_REGMEM;
aerr("[] parse failure\n");
parse_indmode(opr->name, regmask_indirect, 1);
- if (opr->lmod == OPLM_UNSPEC && !strncmp(opr->name, "ebp+", 4)) {
+ if (opr->lmod == OPLM_UNSPEC && parse_stack_el(opr->name, NULL)) {
// might be an equ
- struct parsed_equ *eq = equ_find(NULL, opr->name + 4);
+ struct parsed_equ *eq =
+ equ_find(NULL, parse_stack_el(opr->name, NULL), &i);
if (eq)
opr->lmod = eq->lmod;
}
// most likely var in data segment
opr->type = OPT_LABEL;
+
+ pp = proto_parse(g_fhdr, opr->name);
+ if (pp != NULL) {
+ if (pp->is_fptr) {
+ opr->lmod = OPLM_DWORD;
+ opr->is_ptr = 1;
+ }
+ else {
+ tmplmod = OPLM_UNSPEC;
+ if (!guess_lmod_from_c_type(&tmplmod, &pp->type))
+ anote("unhandled C type '%s' for '%s'\n",
+ pp->type.name, opr->name);
+
+ if (opr->lmod == OPLM_UNSPEC) {
+ opr->lmod = tmplmod;
+ opr->type_from_var = 1;
+ }
+ else if (opr->lmod != tmplmod) {
+ opr->size_mismatch = 1;
+ if (tmplmod < opr->lmod)
+ opr->size_lt = 1;
+ }
+ opr->is_ptr = pp->type.is_ptr;
+ }
+ opr->is_array = pp->type.is_array;
+ }
+
if (opr->lmod == OPLM_UNSPEC)
guess_lmod_from_name(opr);
- if (opr->lmod != OPLM_UNSPEC)
- return wordc;
-
- // TODO: scan data seg to determine type?
return wordc;
}
unsigned int flags;
} pref_table[] = {
{ "rep", OPF_REP },
+ { "repe", OPF_REP|OPF_REPZ },
+ { "repz", OPF_REP|OPF_REPZ },
+ { "repne", OPF_REP|OPF_REPNZ },
+ { "repnz", OPF_REP|OPF_REPNZ },
};
static const struct {
{ "stosb",OP_STOS, 0, 0, OPF_DATA },
{ "stosw",OP_STOS, 0, 0, OPF_DATA },
{ "stosd",OP_STOS, 0, 0, OPF_DATA },
+ { "movsb",OP_MOVS, 0, 0, OPF_DATA },
+ { "movsw",OP_MOVS, 0, 0, OPF_DATA },
+ { "movsd",OP_MOVS, 0, 0, OPF_DATA },
+ { "cmpsb",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS },
+ { "cmpsw",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS },
+ { "cmpsd",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS },
{ "add", OP_ADD, 2, 2, OPF_DATA|OPF_FLAGS },
{ "sub", OP_SUB, 2, 2, OPF_DATA|OPF_FLAGS },
{ "and", OP_AND, 2, 2, OPF_DATA|OPF_FLAGS },
{ "shr", OP_SHR, 2, 2, OPF_DATA|OPF_FLAGS },
{ "sal", OP_SHL, 2, 2, OPF_DATA|OPF_FLAGS },
{ "sar", OP_SAR, 2, 2, OPF_DATA|OPF_FLAGS },
+ { "rol", OP_ROL, 2, 2, OPF_DATA|OPF_FLAGS },
+ { "ror", OP_ROR, 2, 2, OPF_DATA|OPF_FLAGS },
{ "adc", OP_ADC, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC },
{ "sbb", OP_SBB, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC },
{ "inc", OP_INC, 1, 1, OPF_DATA|OPF_FLAGS },
{ "idiv", OP_IDIV, 1, 1, OPF_DATA|OPF_FLAGS },
{ "test", OP_TEST, 2, 2, OPF_FLAGS },
{ "cmp", OP_CMP, 2, 2, OPF_FLAGS },
- { "retn", OP_RET, 0, 1, OPF_JMP|OPF_TAIL },
- { "call", OP_CALL, 1, 1, OPF_JMP|OPF_FLAGS },
+ { "retn", OP_RET, 0, 1, OPF_TAIL },
+ { "call", OP_CALL, 1, 1, OPF_JMP|OPF_DATA|OPF_FLAGS },
{ "jmp", OP_JMP, 1, 1, OPF_JMP },
{ "jo", OP_JO, 1, 1, OPF_JMP|OPF_CC }, // 70 OF=1
{ "jno", OP_JNO, 1, 1, OPF_JMP|OPF_CC }, // 71 OF=0
static void parse_op(struct parsed_op *op, char words[16][256], int wordc)
{
- enum opr_lenmod lmod;
+ enum opr_lenmod lmod = OPLM_UNSPEC;
int prefix_flags = 0;
int regmask_ind;
int regmask;
else if (IS(words[op_w], "stosd"))
lmod = OPLM_DWORD;
op->operand_cnt = 3;
- setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_dst);
- setup_reg_opr(&op->operand[1], xCX, OPLM_DWORD, &op->regmask_dst);
+ setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src);
+ setup_reg_opr(&op->operand[1], xCX, OPLM_DWORD, &op->regmask_src);
+ op->regmask_dst = op->regmask_src;
setup_reg_opr(&op->operand[2], xAX, OPLM_DWORD, &op->regmask_src);
break;
+ case OP_MOVS:
+ case OP_CMPS:
+ if (op->operand_cnt != 0)
+ break;
+ if (words[op_w][4] == 'b')
+ lmod = OPLM_BYTE;
+ else if (words[op_w][4] == 'w')
+ lmod = OPLM_WORD;
+ else if (words[op_w][4] == 'd')
+ lmod = OPLM_DWORD;
+ op->operand_cnt = 3;
+ setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src);
+ setup_reg_opr(&op->operand[1], xSI, OPLM_DWORD, &op->regmask_src);
+ setup_reg_opr(&op->operand[2], xCX, OPLM_DWORD, &op->regmask_src);
+ op->regmask_dst = op->regmask_src;
+ break;
+
case OP_IMUL:
if (op->operand_cnt != 1)
break;
case OP_SHL:
case OP_SHR:
case OP_SAR:
+ case OP_ROL:
+ case OP_ROR:
if (op->operand[1].lmod == OPLM_UNSPEC)
op->operand[1].lmod = OPLM_BYTE;
break;
+ case OP_PUSH:
+ if (op->operand[0].lmod == OPLM_UNSPEC
+ && (op->operand[0].type == OPT_CONST
+ || op->operand[0].type == OPT_OFFSET
+ || op->operand[0].type == OPT_LABEL))
+ op->operand[0].lmod = OPLM_DWORD;
+ break;
+
+ // alignment
+ case OP_MOV:
+ if (op->operand[0].type == OPT_REG && op->operand[1].type == OPT_REG
+ && op->operand[0].reg == xDI && op->operand[1].reg == xDI)
+ {
+ op->flags |= OPF_RMD;
+ }
+ break;
+
+ case OP_LEA:
+ if (op->operand[0].type == OPT_REG
+ && op->operand[1].type == OPT_REGMEM)
+ {
+ char buf[16];
+ snprintf(buf, sizeof(buf), "%s+0", op->operand[0].name);
+ if (IS(buf, op->operand[1].name))
+ op->flags |= OPF_RMD;
+ }
+ break;
+
default:
break;
}
char *p = out;
int i;
+ if (po == NULL)
+ return "???";
+
snprintf(out, sizeof(out), "%s", op_name(po->op));
for (i = 0; i < po->operand_cnt; i++) {
p += strlen(p);
return out;
}
+static const char *lmod_type_u(struct parsed_op *po,
+ enum opr_lenmod lmod)
+{
+ switch (lmod) {
+ case OPLM_DWORD:
+ return "u32";
+ case OPLM_WORD:
+ return "u16";
+ case OPLM_BYTE:
+ return "u8";
+ default:
+ ferr(po, "invalid lmod: %d\n", lmod);
+ return "(_invalid_)";
+ }
+}
+
+static const char *lmod_cast_u(struct parsed_op *po,
+ enum opr_lenmod lmod)
+{
+ switch (lmod) {
+ case OPLM_DWORD:
+ return "";
+ case OPLM_WORD:
+ return "(u16)";
+ case OPLM_BYTE:
+ return "(u8)";
+ default:
+ ferr(po, "invalid lmod: %d\n", lmod);
+ return "(_invalid_)";
+ }
+}
+
+static const char *lmod_cast_u_ptr(struct parsed_op *po,
+ enum opr_lenmod lmod)
+{
+ switch (lmod) {
+ case OPLM_DWORD:
+ return "*(u32 *)";
+ case OPLM_WORD:
+ return "*(u16 *)";
+ case OPLM_BYTE:
+ return "*(u8 *)";
+ default:
+ ferr(po, "invalid lmod: %d\n", lmod);
+ return "(_invalid_)";
+ }
+}
+
+static const char *lmod_cast_s(struct parsed_op *po,
+ enum opr_lenmod lmod)
+{
+ switch (lmod) {
+ case OPLM_DWORD:
+ return "(s32)";
+ case OPLM_WORD:
+ return "(s16)";
+ case OPLM_BYTE:
+ return "(s8)";
+ default:
+ ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
+ return "(_invalid_)";
+ }
+}
+
+static const char *lmod_cast(struct parsed_op *po,
+ enum opr_lenmod lmod, int is_signed)
+{
+ return is_signed ?
+ lmod_cast_s(po, lmod) :
+ lmod_cast_u(po, lmod);
+}
+
+static int lmod_bytes(struct parsed_op *po, enum opr_lenmod lmod)
+{
+ switch (lmod) {
+ case OPLM_DWORD:
+ return 4;
+ case OPLM_WORD:
+ return 2;
+ case OPLM_BYTE:
+ return 1;
+ default:
+ ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
+ return 0;
+ }
+}
+
static const char *opr_name(struct parsed_op *po, int opr_num)
{
if (opr_num >= po->operand_cnt)
return regs_r32[popr->reg];
}
-static struct parsed_equ *equ_find(struct parsed_op *po, const char *name)
+static struct parsed_equ *equ_find(struct parsed_op *po, const char *name,
+ int *extra_offs)
{
+ const char *p;
+ char *endp;
+ int namelen;
int i;
+ *extra_offs = 0;
+ namelen = strlen(name);
+
+ p = strchr(name, '+');
+ if (p != NULL) {
+ namelen = p - name;
+ if (namelen <= 0)
+ ferr(po, "equ parse failed for '%s'\n", name);
+
+ if (IS_START(p, "0x"))
+ p += 2;
+ *extra_offs = strtol(p, &endp, 16);
+ if (*endp != 0)
+ ferr(po, "equ parse failed for '%s'\n", name);
+ }
+
for (i = 0; i < g_eqcnt; i++)
- if (IS(g_eqs[i].name, name))
+ if (strncmp(g_eqs[i].name, name, namelen) == 0
+ && g_eqs[i].name[namelen] == 0)
break;
if (i >= g_eqcnt) {
if (po != NULL)
return &g_eqs[i];
}
-static void bg_frame_access(struct parsed_op *po, enum opr_lenmod lmod,
- char *buf, size_t buf_size, const char *bp_arg,
- int is_src, int is_lea)
+static void stack_frame_access(struct parsed_op *po,
+ struct parsed_opr *popr, char *buf, size_t buf_size,
+ const char *name, const char *cast, int is_src, int is_lea)
{
+ enum opr_lenmod tmp_lmod = OPLM_UNSPEC;
const char *prefix = "";
+ const char *bp_arg = NULL;
+ char ofs_reg[16] = { 0, };
struct parsed_equ *eq;
+ const char *p;
+ char *endp = NULL;
int i, arg_i, arg_s;
+ int unaligned = 0;
+ int stack_ra = 0;
+ int offset = 0;
int sf_ofs;
+ int lim;
+
+ if (po->flags & OPF_EBP_S)
+ ferr(po, "stack_frame_access while ebp is scratch\n");
+
+ if (IS_START(name, "ebp-")
+ || (IS_START(name, "ebp+") && '0' <= name[4] && name[4] <= '9'))
+ {
+ p = name + 4;
+ if (IS_START(p, "0x"))
+ p += 2;
+ offset = strtoul(p, &endp, 16);
+ if (name[3] == '-')
+ offset = -offset;
+ if (*endp != 0)
+ ferr(po, "ebp- parse of '%s' failed\n", name);
+ }
+ else {
+ bp_arg = parse_stack_el(name, ofs_reg);
+ snprintf(g_comment, sizeof(g_comment), "%s", bp_arg);
+ eq = equ_find(po, bp_arg, &offset);
+ if (eq == NULL)
+ ferr(po, "detected but missing eq\n");
+ offset += eq->offset;
+ }
- snprintf(g_comment, sizeof(g_comment), "%s", bp_arg);
+ if (!strncmp(name, "ebp", 3))
+ stack_ra = 4;
- eq = equ_find(po, bp_arg);
+ if (stack_ra <= offset && offset < stack_ra + 4)
+ ferr(po, "reference to ra? %d %d\n", offset, stack_ra);
- if (eq->offset >= 0) {
- arg_i = eq->offset / 4 - 2;
- if (arg_i < 0 || arg_i >= g_func_pp.argc_stack)
- ferr(po, "offset %d doesn't map to any arg\n", eq->offset);
+ if (offset > stack_ra)
+ {
+ arg_i = (offset - stack_ra - 4) / 4;
+ if (arg_i < 0 || arg_i >= g_func_pp->argc_stack)
+ {
+ if (g_func_pp->is_vararg
+ && arg_i == g_func_pp->argc_stack && is_lea)
+ {
+ // should be va_list
+ if (cast[0] == 0)
+ cast = "(u32)";
+ snprintf(buf, buf_size, "%sap", cast);
+ return;
+ }
+ ferr(po, "offset %d (%s,%d) doesn't map to any arg\n",
+ offset, bp_arg, arg_i);
+ }
+ if (ofs_reg[0] != 0)
+ ferr(po, "offset reg on arg access?\n");
- for (i = arg_s = 0; i < g_func_pp.argc; i++) {
- if (g_func_pp.arg[i].reg != NULL)
+ for (i = arg_s = 0; i < g_func_pp->argc; i++) {
+ if (g_func_pp->arg[i].reg != NULL)
continue;
if (arg_s == arg_i)
break;
arg_s++;
}
- if (i == g_func_pp.argc)
+ if (i == g_func_pp->argc)
ferr(po, "arg %d not in prototype?\n", arg_i);
- if (is_lea)
- ferr(po, "lea to arg?\n");
- snprintf(buf, buf_size, "%sa%d", is_src ? "(u32)" : "", i + 1);
+ popr->is_ptr = g_func_pp->arg[i].type.is_ptr;
+
+ switch (popr->lmod)
+ {
+ case OPLM_BYTE:
+ if (is_lea)
+ ferr(po, "lea/byte to arg?\n");
+ if (is_src && (offset & 3) == 0)
+ snprintf(buf, buf_size, "(u8)a%d", i + 1);
+ else
+ snprintf(buf, buf_size, "BYTE%d(a%d)", offset & 3, i + 1);
+ break;
+
+ case OPLM_WORD:
+ if (is_lea)
+ ferr(po, "lea/word to arg?\n");
+ if (offset & 1) {
+ unaligned = 1;
+ if (!is_src) {
+ if (offset & 2)
+ ferr(po, "problematic arg store\n");
+ snprintf(buf, buf_size, "*(u16 *)((char *)&a%d + 1)", i + 1);
+ }
+ else
+ ferr(po, "unaligned arg word load\n");
+ }
+ else if (is_src && (offset & 2) == 0)
+ snprintf(buf, buf_size, "(u16)a%d", i + 1);
+ else
+ snprintf(buf, buf_size, "%sWORD(a%d)",
+ (offset & 2) ? "HI" : "LO", i + 1);
+ break;
+
+ case OPLM_DWORD:
+ if (cast[0])
+ prefix = cast;
+ else if (is_src)
+ prefix = "(u32)";
+
+ if (offset & 3) {
+ unaligned = 1;
+ if (is_lea)
+ snprintf(buf, buf_size, "(u32)&a%d + %d",
+ i + 1, offset & 3);
+ else if (!is_src)
+ ferr(po, "unaligned arg store\n");
+ else {
+ // mov edx, [ebp+arg_4+2]; movsx ecx, dx
+ snprintf(buf, buf_size, "%s(a%d >> %d)",
+ prefix, i + 1, (offset & 3) * 8);
+ }
+ }
+ else {
+ snprintf(buf, buf_size, "%s%sa%d",
+ prefix, is_lea ? "&" : "", i + 1);
+ }
+ break;
+
+ default:
+ ferr(po, "bp_arg bad lmod: %d\n", popr->lmod);
+ }
+
+ if (unaligned)
+ snprintf(g_comment, sizeof(g_comment), "%s unaligned", bp_arg);
+
+ // common problem
+ guess_lmod_from_c_type(&tmp_lmod, &g_func_pp->arg[i].type);
+ if (unaligned && tmp_lmod != OPLM_DWORD)
+ ferr(po, "bp_arg arg/w offset %d and type '%s'\n",
+ offset, g_func_pp->arg[i].type.name);
}
- else {
- if (g_bp_stack == 0)
- ferr(po, "bp_stack access after it was not detected\n");
+ else
+ {
+ if (g_stack_fsz == 0)
+ ferr(po, "stack var access without stackframe\n");
- sf_ofs = g_bp_stack + eq->offset;
- if (sf_ofs < 0)
- ferr(po, "bp_stack offset %d/%d\n", eq->offset, g_bp_stack);
+ sf_ofs = g_stack_fsz + offset;
+ lim = (ofs_reg[0] != 0) ? -4 : 0;
+ if (offset > 0 || sf_ofs < lim)
+ ferr(po, "bp_stack offset %d/%d\n", offset, g_stack_fsz);
if (is_lea)
prefix = "(u32)&";
+ else
+ prefix = cast;
- switch (lmod)
+ switch (popr->lmod)
{
case OPLM_BYTE:
- snprintf(buf, buf_size, "%ssf.b[%d]", prefix, sf_ofs);
+ snprintf(buf, buf_size, "%ssf.b[%d%s%s]",
+ prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg);
break;
+
case OPLM_WORD:
+ if ((sf_ofs & 1) || ofs_reg[0] != 0) {
+ // known unaligned or possibly unaligned
+ strcat(g_comment, " unaligned");
+ if (prefix[0] == 0)
+ prefix = "*(u16 *)&";
+ snprintf(buf, buf_size, "%ssf.b[%d%s%s]",
+ prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg);
+ break;
+ }
snprintf(buf, buf_size, "%ssf.w[%d]", prefix, sf_ofs / 2);
break;
+
case OPLM_DWORD:
+ if ((sf_ofs & 3) || ofs_reg[0] != 0) {
+ // known unaligned or possibly unaligned
+ strcat(g_comment, " unaligned");
+ if (prefix[0] == 0)
+ prefix = "*(u32 *)&";
+ snprintf(buf, buf_size, "%ssf.b[%d%s%s]",
+ prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg);
+ break;
+ }
snprintf(buf, buf_size, "%ssf.d[%d]", prefix, sf_ofs / 4);
break;
+
default:
- ferr(po, "bp_stack bad lmod: %d\n", lmod);
+ ferr(po, "bp_stack bad lmod: %d\n", popr->lmod);
}
}
}
-static char *out_src_opr(char *buf, size_t buf_size,
- struct parsed_op *po, struct parsed_opr *popr, int is_lea)
+static void check_label_read_ref(struct parsed_op *po, const char *name)
{
- const char *cast = "";
- char tmp1[256], tmp2[256];
+ const struct parsed_proto *pp;
+
+ pp = proto_parse(g_fhdr, name);
+ if (pp == NULL)
+ ferr(po, "proto_parse failed for ref '%s'\n", name);
+
+ // currently we can take __cdecl and __stdcall
+ if (pp->is_func && pp->argc_reg != 0)
+ ferr(po, "reg-arg func reference?\n");
+}
+
+static char *out_src_opr(char *buf, size_t buf_size,
+ struct parsed_op *po, struct parsed_opr *popr, const char *cast,
+ int is_lea)
+{
+ char tmp1[256], tmp2[256];
char expr[256];
int ret;
+ if (cast == NULL)
+ cast = "";
+
switch (popr->type) {
case OPT_REG:
if (is_lea)
switch (popr->lmod) {
case OPLM_DWORD:
- snprintf(buf, buf_size, "%s", opr_reg_p(po, popr));
+ snprintf(buf, buf_size, "%s%s", cast, opr_reg_p(po, popr));
break;
case OPLM_WORD:
snprintf(buf, buf_size, "(u16)%s", opr_reg_p(po, popr));
break;
case OPT_REGMEM:
- if (g_bp_frame && !strncmp(popr->name, "ebp+", 4)) {
- bg_frame_access(po, popr->lmod, buf, buf_size,
- popr->name + 4, 1, is_lea);
+ if (parse_stack_el(popr->name, NULL)
+ || (g_bp_frame && !(po->flags & OPF_EBP_S)
+ && IS_START(popr->name, "ebp")))
+ {
+ stack_frame_access(po, popr, buf, buf_size,
+ popr->name, cast, 1, is_lea);
break;
}
break;
}
- switch (popr->lmod) {
- case OPLM_DWORD:
- cast = "*(u32 *)";
- break;
- case OPLM_WORD:
- cast = "*(u16 *)";
- break;
- case OPLM_BYTE:
- cast = "*(u8 *)";
- break;
- default:
- ferr(po, "invalid lmod: %d\n", popr->lmod);
- }
+ if (cast[0] == 0)
+ cast = lmod_cast_u_ptr(po, popr->lmod);
snprintf(buf, buf_size, "%s(%s)", cast, expr);
break;
case OPT_LABEL:
+ check_label_read_ref(po, popr->name);
+ if (cast[0] == 0 && popr->is_ptr)
+ cast = "(u32)";
+
if (is_lea)
snprintf(buf, buf_size, "(u32)&%s", popr->name);
+ else if (popr->size_lt)
+ snprintf(buf, buf_size, "%s%s%s%s", cast,
+ lmod_cast_u_ptr(po, popr->lmod),
+ popr->is_array ? "" : "&",
+ popr->name);
else
- snprintf(buf, buf_size, "(u32)%s", popr->name);
+ snprintf(buf, buf_size, "%s%s%s", cast, popr->name,
+ popr->is_array ? "[0]" : "");
break;
case OPT_OFFSET:
+ check_label_read_ref(po, popr->name);
+ if (cast[0] == 0)
+ cast = "(u32)";
if (is_lea)
ferr(po, "lea an offset?\n");
- snprintf(buf, buf_size, "(u32)&%s", popr->name);
+ snprintf(buf, buf_size, "%s&%s", cast, popr->name);
break;
case OPT_CONST:
if (is_lea)
ferr(po, "lea from const?\n");
- printf_number(buf, buf_size, popr->val);
+ snprintf(buf, buf_size, "%s", cast);
+ ret = strlen(buf);
+ printf_number(buf + ret, buf_size - ret, popr->val);
break;
default:
return buf;
}
+// note: may set is_ptr (we find that out late for ebp frame..)
static char *out_dst_opr(char *buf, size_t buf_size,
struct parsed_op *po, struct parsed_opr *popr)
{
break;
case OPT_REGMEM:
- if (g_bp_frame && !strncmp(popr->name, "ebp+", 4)) {
- bg_frame_access(po, popr->lmod, buf, buf_size,
- popr->name + 4, 0, 0);
+ if (parse_stack_el(popr->name, NULL)
+ || (g_bp_frame && !(po->flags & OPF_EBP_S)
+ && IS_START(popr->name, "ebp")))
+ {
+ stack_frame_access(po, popr, buf, buf_size,
+ popr->name, "", 0, 0);
break;
}
- return out_src_opr(buf, buf_size, po, popr, 0);
+ return out_src_opr(buf, buf_size, po, popr, NULL, 0);
+
+ case OPT_LABEL:
+ if (popr->size_mismatch)
+ snprintf(buf, buf_size, "%s%s%s",
+ lmod_cast_u_ptr(po, popr->lmod),
+ popr->is_array ? "" : "&", popr->name);
+ else
+ snprintf(buf, buf_size, "%s%s", popr->name,
+ popr->is_array ? "[0]" : "");
+ break;
default:
ferr(po, "invalid dst type: %d\n", popr->type);
return buf;
}
-static const char *lmod_cast_u(struct parsed_op *po,
- enum opr_lenmod lmod)
-{
- switch (lmod) {
- case OPLM_DWORD:
- return "";
- case OPLM_WORD:
- return "(u16)";
- case OPLM_BYTE:
- return "(u8)";
- default:
- ferr(po, "invalid lmod: %d\n", lmod);
- return "(_invalid_)";
- }
-}
-
-static const char *lmod_cast_s(struct parsed_op *po,
- enum opr_lenmod lmod)
-{
- switch (lmod) {
- case OPLM_DWORD:
- return "(s32)";
- case OPLM_WORD:
- return "(s16)";
- case OPLM_BYTE:
- return "(s8)";
- default:
- ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
- return "(_invalid_)";
- }
-}
-
-static const char *lmod_cast(struct parsed_op *po,
- enum opr_lenmod lmod, int is_signed)
-{
- return is_signed ?
- lmod_cast_s(po, lmod) :
- lmod_cast_u(po, lmod);
-}
-
-static int lmod_bytes(struct parsed_op *po, enum opr_lenmod lmod)
+static char *out_src_opr_u32(char *buf, size_t buf_size,
+ struct parsed_op *po, struct parsed_opr *popr)
{
- switch (lmod) {
- case OPLM_DWORD:
- return 4;
- case OPLM_WORD:
- return 2;
- case OPLM_BYTE:
- return 1;
- default:
- ferr(po, "%s: invalid lmod: %d\n", __func__, lmod);
- return 0;
- }
+ return out_src_opr(buf, buf_size, po, popr, NULL, 0);
}
static enum parsed_flag_op split_cond(struct parsed_op *po,
if (po->op == OP_TEST) {
if (IS(opr_name(po, 0), opr_name(po, 1))) {
- out_src_opr(buf3, sizeof(buf3), po, &po->operand[0], 0);
+ out_src_opr_u32(buf3, sizeof(buf3), po, &po->operand[0]);
}
else {
- out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0);
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]);
snprintf(buf3, sizeof(buf3), "(%s & %s)", buf1, buf2);
}
out_test_for_cc(buf, buf_size, po, pfo, is_inv,
po->operand[0].lmod, buf3);
}
else if (po->op == OP_CMP) {
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0);
- out_src_opr(buf3, sizeof(buf3), po, &po->operand[1], 0);
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]);
+ out_src_opr_u32(buf3, sizeof(buf3), po, &po->operand[1]);
out_cmp_for_cc(buf, buf_size, po, pfo, is_inv,
po->operand[0].lmod, buf2, buf3);
}
popr1->lmod = popr2->lmod;
else if (popr2->lmod == OPLM_UNSPEC)
popr2->lmod = popr1->lmod;
- else if (popr1->lmod != popr2->lmod)
- ferr(po, "conflicting lmods: %d vs %d\n", popr1->lmod, popr2->lmod);
+ else if (popr1->lmod != popr2->lmod) {
+ if (popr1->type_from_var) {
+ popr1->size_mismatch = 1;
+ if (popr1->lmod < popr2->lmod)
+ popr1->size_lt = 1;
+ popr1->lmod = popr2->lmod;
+ }
+ else if (popr2->type_from_var) {
+ popr2->size_mismatch = 1;
+ if (popr2->lmod < popr1->lmod)
+ popr2->size_lt = 1;
+ popr2->lmod = popr1->lmod;
+ }
+ else
+ ferr(po, "conflicting lmods: %d vs %d\n",
+ popr1->lmod, popr2->lmod);
+ }
}
static const char *op_to_c(struct parsed_op *po)
}
}
+static void set_flag_no_dup(struct parsed_op *po, enum op_flags flag,
+ enum op_flags flag_check)
+{
+ if (po->flags & flag)
+ ferr(po, "flag %x already set\n", flag);
+ if (po->flags & flag_check)
+ ferr(po, "flag_check %x already set\n", flag_check);
+
+ po->flags |= flag;
+}
+
+// last op in stream - unconditional branch or ret
+#define LAST_OP(_i) ((ops[_i].flags & OPF_TAIL) \
+ || (ops[_i].flags & (OPF_JMP|OPF_CC)) == OPF_JMP)
+
static int scan_for_pop(int i, int opcnt, const char *reg,
- int magic, int do_patch)
+ int magic, int depth, int *maxdepth, int do_flags)
{
struct parsed_op *po;
int ret = 0;
+ int j;
for (; i < opcnt; i++) {
po = &ops[i];
if (po->flags & OPF_TAIL)
return -1; // deadend
- if (po->flags & OPF_RMD)
+ if ((po->flags & OPF_RMD)
+ || (po->op == OP_PUSH && po->argnum != 0)) // arg push
continue;
if ((po->flags & OPF_JMP) && po->op != OP_CALL) {
+ if (po->btj != NULL) {
+ // jumptable
+ for (j = 0; j < po->btj->count - 1; j++) {
+ ret |= scan_for_pop(po->btj->d[j].bt_i, opcnt, reg, magic,
+ depth, maxdepth, do_flags);
+ if (ret < 0)
+ return ret; // dead end
+ }
+ // follow last jumptable entry
+ i = po->btj->d[j].bt_i - 1;
+ continue;
+ }
+
if (po->bt_i < 0) {
ferr(po, "dead branch\n");
return -1;
}
if (po->flags & OPF_CC) {
- ret |= scan_for_pop(po->bt_i, opcnt, reg, magic, do_patch);
+ ret |= scan_for_pop(po->bt_i, opcnt, reg, magic,
+ depth, maxdepth, do_flags);
if (ret < 0)
return ret; // dead end
}
continue;
}
- if (po->op == OP_POP && po->operand[0].type == OPT_REG
+ if ((po->op == OP_POP || po->op == OP_PUSH)
+ && po->operand[0].type == OPT_REG
&& IS(po->operand[0].name, reg))
{
- if (do_patch)
- po->flags |= OPF_RMD;
- return 1;
+ if (po->op == OP_PUSH) {
+ depth++;
+ if (depth > *maxdepth)
+ *maxdepth = depth;
+ if (do_flags)
+ set_flag_no_dup(po, OPF_RSAVE, OPF_RMD);
+ }
+ else if (depth == 0) {
+ if (do_flags)
+ set_flag_no_dup(po, OPF_RMD, OPF_RSAVE);
+ return 1;
+ }
+ else {
+ depth--;
+ if (depth < 0) // should not happen
+ ferr(po, "fail with depth\n");
+ if (do_flags)
+ set_flag_no_dup(po, OPF_RSAVE, OPF_RMD);
+ }
}
}
}
// scan for pop starting from 'ret' op (all paths)
-static int scan_for_pop_ret(int i, int opcnt, const char *reg, int do_patch)
+static int scan_for_pop_ret(int i, int opcnt, const char *reg,
+ int flag_set)
{
int found = 0;
int j;
&& IS(ops[j].operand[0].name, reg))
{
found = 1;
- if (do_patch)
- ops[j].flags |= OPF_RMD;
+ ops[j].flags |= flag_set;
break;
}
if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA))
return 0;
- if (po_test->regmask_src & po->regmask_dst)
+ if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST)
+ return 0;
+
+ if ((po_test->regmask_src | po_test->regmask_dst) & po->regmask_dst)
+ return 1;
+
+ // in reality, it can wreck any register, but in decompiled C
+ // version it can only overwrite eax or edx:eax
+ if (po->op == OP_CALL
+ && ((po_test->regmask_src | po_test->regmask_dst)
+ & ((1 << xAX)|(1 << xDX))))
return 1;
for (i = 0; i < po_test->operand_cnt; i++)
// scan for any po_test operand modification in range given
static int scan_for_mod(struct parsed_op *po_test, int i, int opcnt)
{
+ if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST)
+ return -1;
+
for (; i < opcnt; i++) {
if (is_any_opr_modified(po_test, &ops[i]))
return i;
return -1;
}
-static int scan_for_flag_set(int i)
+static int scan_for_flag_set(int i, int magic, int *branched,
+ int *setters, int *setter_cnt)
{
- for (; i >= 0; i--) {
- if (ops[i].flags & OPF_FLAGS)
- return i;
+ struct label_ref *lr;
+ int ret;
- if ((ops[i].flags & OPF_JMP) && !(ops[i].flags & OPF_CC))
+ while (i >= 0) {
+ if (ops[i].cc_scratch == magic) {
+ ferr(&ops[i], "%s looped\n", __func__);
return -1;
- if (g_labels[i][0] != 0)
+ }
+ ops[i].cc_scratch = magic;
+
+ if (g_labels[i][0] != 0) {
+ *branched = 1;
+
+ lr = &g_label_refs[i];
+ for (; lr->next; lr = lr->next) {
+ ret = scan_for_flag_set(lr->i, magic,
+ branched, setters, setter_cnt);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (i > 0 && LAST_OP(i - 1)) {
+ i = g_label_refs[i].i;
+ continue;
+ }
+ ret = scan_for_flag_set(lr->i, magic,
+ branched, setters, setter_cnt);
+ if (ret < 0)
+ return ret;
+ }
+ i--;
+
+ if (ops[i].flags & OPF_FLAGS) {
+ setters[*setter_cnt] = i;
+ (*setter_cnt)++;
+ return 0;
+ }
+
+ if ((ops[i].flags & OPF_JMP) && !(ops[i].flags & OPF_CC))
return -1;
}
return -1;
}
+static int scan_for_reg_clear(int i, int reg)
+{
+ for (; i >= 0; i--) {
+ if (ops[i].op == OP_XOR
+ && ops[i].operand[0].lmod == OPLM_DWORD
+ && ops[i].operand[0].reg == ops[i].operand[1].reg
+ && ops[i].operand[0].reg == reg)
+ return i;
+
+ if (ops[i].regmask_dst & (1 << reg))
+ return -1;
+ if (g_labels[i][0] != 0)
+ return -1;
+ }
+
+ return -1;
+}
+
+// scan for positive, constant esp adjust
+static int scan_for_esp_adjust(int i, int opcnt, int *adj)
+{
+ struct parsed_op *po;
+ *adj = 0;
+
+ for (; i < opcnt; i++) {
+ po = &ops[i];
+
+ if (po->op == OP_ADD && po->operand[0].reg == xSP) {
+ if (po->operand[1].type != OPT_CONST)
+ ferr(&ops[i], "non-const esp adjust?\n");
+ *adj += po->operand[1].val;
+ if (*adj & 3)
+ ferr(&ops[i], "unaligned esp adjust: %x\n", *adj);
+ return i;
+ }
+ else if (po->op == OP_PUSH)
+ *adj -= lmod_bytes(po, po->operand[0].lmod);
+ else if (po->op == OP_POP)
+ *adj += lmod_bytes(po, po->operand[0].lmod);
+ else if (po->flags & (OPF_JMP|OPF_TAIL)) {
+ if (po->op != OP_CALL)
+ return -1;
+ if (po->operand[0].type != OPT_LABEL)
+ return -1;
+ // TODO: should only allow combining __cdecl calls..
+ }
+
+ if (g_labels[i][0] != 0)
+ return -1;
+ }
+
+ return -1;
+}
+
+static void scan_fwd_set_flags(int i, int opcnt, int magic, int flags)
+{
+ struct parsed_op *po;
+ int j;
+
+ if (i < 0)
+ ferr(ops, "%s: followed bad branch?\n", __func__);
+
+ for (; i < opcnt; i++) {
+ po = &ops[i];
+ if (po->cc_scratch == magic)
+ return;
+ po->cc_scratch = magic;
+ po->flags |= flags;
+
+ if ((po->flags & OPF_JMP) && po->op != OP_CALL) {
+ if (po->btj != NULL) {
+ // jumptable
+ for (j = 0; j < po->btj->count; j++)
+ scan_fwd_set_flags(po->btj->d[j].bt_i, opcnt, magic, flags);
+ return;
+ }
+
+ scan_fwd_set_flags(po->bt_i, opcnt, magic, flags);
+ if (!(po->flags & OPF_CC))
+ return;
+ }
+ if (po->flags & OPF_TAIL)
+ return;
+ }
+}
+
+static int collect_call_args(struct parsed_op *po, int i,
+ struct parsed_proto *pp, int *save_arg_vars, int arg,
+ int magic, int need_op_saving, int may_reuse)
+{
+ struct parsed_proto *pp_tmp;
+ struct label_ref *lr;
+ int need_to_save_current;
+ int ret = 0;
+ int j;
+
+ if (i < 0) {
+ ferr(po, "no refs for '%s'?\n", g_labels[i]);
+ return -1;
+ }
+
+ for (; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+ magic = (magic & 0xffffff) | (arg << 24);
+
+ for (j = i; j >= 0 && arg < pp->argc; )
+ {
+ if (((ops[j].cc_scratch ^ magic) & 0xffffff) == 0) {
+ if (ops[j].cc_scratch != magic) {
+ ferr(&ops[j], "arg collect hit same path with diff args for %s\n",
+ pp->name);
+ return -1;
+ }
+ // ok: have already been here
+ return 0;
+ }
+ ops[j].cc_scratch = magic;
+
+ if (g_labels[j][0] != 0) {
+ lr = &g_label_refs[j];
+ if (lr->next != NULL)
+ need_op_saving = 1;
+ for (; lr->next; lr = lr->next) {
+ if ((ops[lr->i].flags & (OPF_JMP|OPF_CC)) != OPF_JMP)
+ may_reuse = 1;
+ ret = collect_call_args(po, lr->i, pp, save_arg_vars,
+ arg, magic, need_op_saving, may_reuse);
+ if (ret < 0)
+ return ret;
+ }
+
+ if ((ops[lr->i].flags & (OPF_JMP|OPF_CC)) != OPF_JMP)
+ may_reuse = 1;
+ if (j > 0 && LAST_OP(j - 1)) {
+ // follow last branch in reverse
+ j = lr->i;
+ continue;
+ }
+ need_op_saving = 1;
+ ret = collect_call_args(po, lr->i, pp, save_arg_vars,
+ arg, magic, need_op_saving, may_reuse);
+ if (ret < 0)
+ return ret;
+ }
+ j--;
+
+ if (ops[j].op == OP_CALL)
+ {
+ pp_tmp = ops[j].datap;
+ if (pp_tmp == NULL)
+ ferr(po, "arg collect hit unparsed call\n");
+ if (may_reuse && pp_tmp->argc_stack > 0)
+ ferr(po, "arg collect %d/%d hit '%s' with %d stack args\n",
+ arg, pp->argc, opr_name(&ops[j], 0), pp_tmp->argc_stack);
+ }
+ else if (ops[j].op == OP_ADD && ops[j].operand[0].reg == xSP) {
+ ferr(po, "arg collect %d/%d hit esp adjust\n",
+ arg, pp->argc);
+ }
+ else if (ops[j].op == OP_POP) {
+ ferr(po, "arg collect %d/%d hit pop\n", arg, pp->argc);
+ }
+ else if ((ops[j].flags & (OPF_JMP|OPF_CC)) == (OPF_JMP|OPF_CC))
+ {
+ may_reuse = 1;
+ }
+ else if (ops[j].op == OP_PUSH && !(ops[j].flags & OPF_FARG))
+ {
+ pp->arg[arg].datap = &ops[j];
+ need_to_save_current = 0;
+ if (!need_op_saving) {
+ ret = scan_for_mod(&ops[j], j + 1, i);
+ need_to_save_current = (ret >= 0);
+ }
+ if (need_op_saving || need_to_save_current) {
+ // mark this push as one that needs operand saving
+ ops[j].flags &= ~OPF_RMD;
+ if (ops[j].argnum == 0) {
+ ops[j].argnum = arg + 1;
+ *save_arg_vars |= 1 << arg;
+ }
+ else if (ops[j].argnum < arg + 1)
+ ferr(&ops[j], "argnum conflict (%d<%d) for '%s'\n",
+ ops[j].argnum, arg + 1, pp->name);
+ }
+ else if (ops[j].argnum == 0)
+ ops[j].flags |= OPF_RMD;
+
+ // some PUSHes are reused by different calls on other branches,
+ // but that can't happen if we didn't branch, so they
+ // can be removed from future searches (handles nested calls)
+ if (!may_reuse)
+ ops[j].flags |= OPF_FARG;
+
+ // next arg
+ for (arg++; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+ magic = (magic & 0xffffff) | (arg << 24);
+ }
+ }
+
+ if (arg < pp->argc) {
+ ferr(po, "arg collect failed for '%s': %d/%d\n",
+ pp->name, arg, pp->argc);
+ ret = -1;
+ }
+ return ret;
+}
+
+static void add_label_ref(struct label_ref *lr, int op_i)
+{
+ struct label_ref *lr_new;
+
+ if (lr->i == -1) {
+ lr->i = op_i;
+ return;
+ }
+
+ lr_new = calloc(1, sizeof(*lr_new));
+ lr_new->i = op_i;
+ lr_new->next = lr->next;
+ lr->next = lr_new;
+}
+
+static void output_std_flags(FILE *fout, struct parsed_op *po,
+ int *pfomask, const char *dst_opr_text)
+{
+ if (*pfomask & (1 << PFO_Z)) {
+ fprintf(fout, "\n cond_z = (%s%s == 0);",
+ lmod_cast_u(po, po->operand[0].lmod), dst_opr_text);
+ *pfomask &= ~(1 << PFO_Z);
+ }
+ if (*pfomask & (1 << PFO_S)) {
+ fprintf(fout, "\n cond_s = (%s%s < 0);",
+ lmod_cast_s(po, po->operand[0].lmod), dst_opr_text);
+ *pfomask &= ~(1 << PFO_S);
+ }
+}
+
static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt)
{
struct parsed_op *po, *delayed_flag_op = NULL, *tmp_op;
struct parsed_opr *last_arith_dst = NULL;
- char buf1[256], buf2[256], buf3[256];
+ char buf1[256], buf2[256], buf3[256], cast[64];
+ const struct parsed_proto *pp_c;
struct parsed_proto *pp, *pp_tmp;
+ struct parsed_data *pd;
const char *tmpname;
enum parsed_flag_op pfo;
int save_arg_vars = 0;
int cmp_result_vars = 0;
int need_mul_var = 0;
+ int have_func_ret = 0;
int had_decl = 0;
+ int label_pending = 0;
+ int regmask_save = 0;
int regmask_arg = 0;
+ int regmask_now = 0;
int regmask = 0;
int pfomask = 0;
+ int found = 0;
+ int depth = 0;
int no_output;
+ int i, j, l;
int dummy;
int arg;
- int i, j;
int reg;
int ret;
- g_bp_frame = g_bp_stack = 0;
+ g_bp_frame = g_sp_frame = g_stack_fsz = 0;
- ret = proto_parse(fhdr, funcn, &g_func_pp);
- if (ret)
+ g_func_pp = proto_parse(fhdr, funcn);
+ if (g_func_pp == NULL)
ferr(ops, "proto_parse failed for '%s'\n", funcn);
- fprintf(fout, "%s %s(", g_func_pp.ret_type, funcn);
- for (i = 0; i < g_func_pp.argc; i++) {
+ fprintf(fout, "%s ", g_func_pp->ret_type.name);
+ if (g_func_pp->is_stdcall && g_func_pp->argc_reg == 0)
+ fprintf(fout, "__stdcall ");
+ if (g_ida_func_attr & IDAFA_NORETURN)
+ fprintf(fout, "noreturn ");
+ fprintf(fout, "%s(", funcn);
+
+ for (i = 0; i < g_func_pp->argc; i++) {
if (i > 0)
fprintf(fout, ", ");
- fprintf(fout, "%s a%d", g_func_pp.arg[i].type, i + 1);
+ if (g_func_pp->arg[i].fptr != NULL) {
+ // func pointer..
+ pp = g_func_pp->arg[i].fptr;
+ fprintf(fout, "%s (", pp->ret_type.name);
+ if (pp->is_stdcall && pp->argc_reg == 0)
+ fprintf(fout, "__stdcall ");
+ fprintf(fout, "*a%d)(", i + 1);
+ for (j = 0; j < pp->argc; j++) {
+ if (j > 0)
+ fprintf(fout, ", ");
+ if (pp->arg[j].fptr)
+ ferr(ops, "nested fptr\n");
+ fprintf(fout, "%s", pp->arg[j].type.name);
+ }
+ fprintf(fout, ")");
+ }
+ else {
+ fprintf(fout, "%s a%d", g_func_pp->arg[i].type.name, i + 1);
+ }
}
+ if (g_func_pp->is_vararg) {
+ if (i > 0)
+ fprintf(fout, ", ");
+ fprintf(fout, "...");
+ }
+
fprintf(fout, ")\n{\n");
// pass1:
- // - handle ebp frame, remove ops related to it
+ // - handle ebp/esp frame, remove ops related to it
if (ops[0].op == OP_PUSH && IS(opr_name(&ops[0], 0), "ebp")
&& ops[1].op == OP_MOV
&& IS(opr_name(&ops[1], 0), "ebp")
g_bp_frame = 1;
ops[0].flags |= OPF_RMD;
ops[1].flags |= OPF_RMD;
+ i = 2;
if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) {
- g_bp_stack = opr_const(&ops[2], 1);
+ g_stack_fsz = opr_const(&ops[2], 1);
ops[2].flags |= OPF_RMD;
+ i++;
}
else {
// another way msvc builds stack frame..
i = 2;
while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
- g_bp_stack += 4;
+ g_stack_fsz += 4;
ops[i].flags |= OPF_RMD;
ecx_push++;
i++;
}
+ // and another way..
+ if (i == 2 && ops[i].op == OP_MOV && ops[i].operand[0].reg == xAX
+ && ops[i].operand[1].type == OPT_CONST
+ && ops[i + 1].op == OP_CALL
+ && IS(opr_name(&ops[i + 1], 0), "__alloca_probe"))
+ {
+ g_stack_fsz += ops[i].operand[1].val;
+ ops[i].flags |= OPF_RMD;
+ i++;
+ ops[i].flags |= OPF_RMD;
+ i++;
+ }
}
- i = 2;
+ found = 0;
do {
for (; i < opcnt; i++)
if (ops[i].op == OP_RET)
break;
- if (ops[i - 1].op != OP_POP || !IS(opr_name(&ops[i - 1], 0), "ebp"))
+ if (i == opcnt && (ops[i - 1].flags & OPF_JMP) && found)
+ break;
+
+ if (ops[i - 1].op == OP_POP && IS(opr_name(&ops[i - 1], 0), "ebp"))
+ ops[i - 1].flags |= OPF_RMD;
+ else if (!(g_ida_func_attr & IDAFA_NORETURN))
ferr(&ops[i - 1], "'pop ebp' expected\n");
- ops[i - 1].flags |= OPF_RMD;
- if (g_bp_stack != 0) {
- if (ops[i - 2].op != OP_MOV
- || !IS(opr_name(&ops[i - 2], 0), "esp")
- || !IS(opr_name(&ops[i - 2], 1), "ebp"))
+ if (g_stack_fsz != 0) {
+ if (ops[i - 2].op == OP_MOV
+ && IS(opr_name(&ops[i - 2], 0), "esp")
+ && IS(opr_name(&ops[i - 2], 1), "ebp"))
{
- ferr(&ops[i - 2], "esp restore expected\n");
+ ops[i - 2].flags |= OPF_RMD;
}
- ops[i - 2].flags |= OPF_RMD;
+ else if (!(g_ida_func_attr & IDAFA_NORETURN))
+ ferr(&ops[i - 2], "esp restore expected\n");
if (ecx_push && ops[i - 3].op == OP_POP
&& IS(opr_name(&ops[i - 3], 0), "ecx"))
}
}
+ found = 1;
i++;
} while (i < opcnt);
}
-
- // pass2:
- // - resolve all branches
- for (i = 0; i < opcnt; i++) {
+ else {
+ for (i = 0; i < opcnt; i++) {
+ if (ops[i].op == OP_PUSH || (ops[i].flags & (OPF_JMP|OPF_TAIL)))
+ break;
+ if (ops[i].op == OP_SUB && ops[i].operand[0].reg == xSP
+ && ops[i].operand[1].type == OPT_CONST)
+ {
+ g_sp_frame = 1;
+ break;
+ }
+ }
+
+ if (g_sp_frame)
+ {
+ g_stack_fsz = ops[i].operand[1].val;
+ ops[i].flags |= OPF_RMD;
+
+ i++;
+ do {
+ for (; i < opcnt; i++)
+ if (ops[i].op == OP_RET)
+ break;
+ if (ops[i - 1].op != OP_ADD
+ || !IS(opr_name(&ops[i - 1], 0), "esp")
+ || ops[i - 1].operand[1].type != OPT_CONST
+ || ops[i - 1].operand[1].val != g_stack_fsz)
+ ferr(&ops[i - 1], "'add esp' expected\n");
+ ops[i - 1].flags |= OPF_RMD;
+
+ i++;
+ } while (i < opcnt);
+ }
+ }
+
+ // pass2:
+ // - resolve all branches
+ for (i = 0; i < opcnt; i++)
+ {
po = &ops[i];
po->bt_i = -1;
+ po->btj = NULL;
if ((po->flags & OPF_RMD) || !(po->flags & OPF_JMP)
|| po->op == OP_CALL || po->op == OP_RET)
continue;
- for (j = 0; j < opcnt; j++) {
- if (g_labels[j][0] && IS(po->operand[0].name, g_labels[j])) {
- po->bt_i = j;
- po->lrl = g_label_refs[j];
- g_label_refs[j] = po;
+ if (po->operand[0].type == OPT_REGMEM) {
+ char *p = strchr(po->operand[0].name, '[');
+ if (p == NULL)
+ ferr(po, "unhandled indirect branch\n");
+ ret = p - po->operand[0].name;
+ strncpy(buf1, po->operand[0].name, ret);
+ buf1[ret] = 0;
+
+ for (j = 0, pd = NULL; j < g_func_pd_cnt; j++) {
+ if (IS(g_func_pd[j].label, buf1)) {
+ pd = &g_func_pd[j];
+ break;
+ }
+ }
+ if (pd == NULL)
+ //ferr(po, "label '%s' not parsed?\n", buf1);
+ goto tailcall;
+ if (pd->type != OPT_OFFSET)
+ ferr(po, "label '%s' with non-offset data?\n", buf1);
+
+ // find all labels, link
+ for (j = 0; j < pd->count; j++) {
+ for (l = 0; l < opcnt; l++) {
+ if (g_labels[l][0] && IS(g_labels[l], pd->d[j].u.label)) {
+ add_label_ref(&g_label_refs[l], i);
+ pd->d[j].bt_i = l;
+ break;
+ }
+ }
+ }
+
+ po->btj = pd;
+ continue;
+ }
+
+ for (l = 0; l < opcnt; l++) {
+ if (g_labels[l][0] && IS(po->operand[0].name, g_labels[l])) {
+ add_label_ref(&g_label_refs[l], i);
+ po->bt_i = l;
break;
}
}
- if (po->bt_i == -1) {
+ if (po->bt_i != -1)
+ continue;
+
+ if (po->operand[0].type == OPT_LABEL)
// assume tail call
- po->op = OP_CALL;
- po->flags |= OPF_TAIL;
- }
+ goto tailcall;
+
+ ferr(po, "unhandled branch\n");
+
+tailcall:
+ po->op = OP_CALL;
+ po->flags |= OPF_TAIL;
}
// pass3:
- // - find POPs for PUSHes, rm both
- // - scan for all used registers
- // - find flag set ops for their users
// - process calls
- for (i = 0; i < opcnt; i++) {
+ for (i = 0; i < opcnt; i++)
+ {
po = &ops[i];
if (po->flags & OPF_RMD)
continue;
- if (po->op == OP_PUSH && po->operand[0].type == OPT_REG) {
- if (po->operand[0].reg < 0)
- ferr(po, "reg not set for push?\n");
- if (!(regmask & (1 << po->operand[0].reg))) { // reg save
- ret = scan_for_pop(i + 1, opcnt,
- po->operand[0].name, i + opcnt, 0);
- if (ret == 1) {
- po->flags |= OPF_RMD;
- scan_for_pop(i + 1, opcnt, po->operand[0].name,
- i + opcnt * 2, 1);
- continue;
+ if (po->op == OP_CALL)
+ {
+ pp = calloc(1, sizeof(*pp));
+ my_assert_not(pp, NULL);
+ tmpname = opr_name(po, 0);
+ if (po->operand[0].type != OPT_LABEL)
+ {
+ ret = scan_for_esp_adjust(i + 1, opcnt, &j);
+ if (ret < 0)
+ ferr(po, "non-__cdecl indirect call unhandled yet\n");
+ j /= 4;
+ if (j > ARRAY_SIZE(pp->arg))
+ ferr(po, "esp adjust too large?\n");
+ pp->ret_type.name = strdup("int");
+ pp->argc = pp->argc_stack = j;
+ for (arg = 0; arg < pp->argc; arg++)
+ pp->arg[arg].type.name = strdup("int");
+ }
+ else {
+ pp_c = proto_parse(fhdr, tmpname);
+ if (pp_c == NULL)
+ ferr(po, "proto_parse failed for call '%s'\n", tmpname);
+ pp = proto_clone(pp_c);
+ }
+
+ // look for and make use of esp adjust
+ ret = -1;
+ if (!pp->is_stdcall && pp->argc_stack > 0)
+ ret = scan_for_esp_adjust(i + 1, opcnt, &j);
+ if (ret >= 0) {
+ if (pp->is_vararg) {
+ if (j / 4 < pp->argc_stack)
+ ferr(po, "esp adjust is too small: %x < %x\n",
+ j, pp->argc_stack * 4);
+ // modify pp to make it have varargs as normal args
+ arg = pp->argc;
+ pp->argc += j / 4 - pp->argc_stack;
+ for (; arg < pp->argc; arg++) {
+ pp->arg[arg].type.name = strdup("int");
+ pp->argc_stack++;
+ }
+ if (pp->argc > ARRAY_SIZE(pp->arg))
+ ferr(po, "too many args for '%s'\n", tmpname);
}
- ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0);
- if (ret == 0) {
- po->flags |= OPF_RMD;
- scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 1);
- continue;
+ if (pp->argc_stack != j / 4)
+ ferr(po, "stack tracking failed for '%s': %x %x\n",
+ tmpname, pp->argc_stack * 4, j);
+
+ ops[ret].flags |= OPF_RMD;
+ // a bit of a hack, but deals with use of
+ // single adj for multiple calls
+ ops[ret].operand[1].val -= j;
+ }
+ else if (pp->is_vararg)
+ ferr(po, "missing esp_adjust for vararg func '%s'\n",
+ pp->name);
+
+ // can't call functions with non-__cdecl callbacks yet
+ for (arg = 0; arg < pp->argc; arg++) {
+ if (pp->arg[arg].fptr != NULL) {
+ pp_tmp = pp->arg[arg].fptr;
+ if (pp_tmp->is_stdcall || pp_tmp->argc != pp_tmp->argc_stack)
+ ferr(po, "'%s' has a non-__cdecl callback\n", tmpname);
}
}
+
+ collect_call_args(po, i, pp, &save_arg_vars,
+ 0, i + opcnt * 2, 0, 0);
+
+ if (strstr(pp->ret_type.name, "int64"))
+ need_mul_var = 1;
+ if (!(po->flags & OPF_TAIL) && !IS(pp->ret_type.name, "void"))
+ have_func_ret = 1;
+ po->datap = pp;
}
+ }
- regmask |= po->regmask_src | po->regmask_dst;
+ // pass4:
+ // - find POPs for PUSHes, rm both
+ // - scan for all used registers
+ // - find flag set ops for their users
+ // - declare indirect functions
+ for (i = 0; i < opcnt; i++) {
+ po = &ops[i];
+ if (po->flags & OPF_RMD)
+ continue;
- if (po->flags & OPF_CC)
+ if (po->op == OP_PUSH
+ && po->argnum == 0 && !(po->flags & OPF_RSAVE)
+ && po->operand[0].type == OPT_REG)
{
- ret = scan_for_flag_set(i - 1);
- if (ret < 0)
- ferr(po, "unable to trace flag setter\n");
+ reg = po->operand[0].reg;
+ if (reg < 0)
+ ferr(po, "reg not set for push?\n");
- tmp_op = &ops[ret]; // flag setter
- pfo = split_cond(po, po->op, &dummy);
- pfomask = 0;
+ depth = 0;
+ ret = scan_for_pop(i + 1, opcnt,
+ po->operand[0].name, i + opcnt * 3, 0, &depth, 0);
+ if (ret == 1) {
+ if (depth > 1)
+ ferr(po, "too much depth: %d\n", depth);
+ if (depth > 0)
+ regmask_save |= 1 << reg;
- // to get nicer code, we try to delay test and cmp;
- // if we can't because of operand modification, or if we
- // have math op, make it calculate flags explicitly
- if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) {
- if (scan_for_mod(tmp_op, ret + 1, i) >= 0)
- pfomask = 1 << pfo;
- }
- else {
- if ((pfo != PFO_Z && pfo != PFO_S && pfo != PFO_P)
- || scan_for_mod_opr0(tmp_op, ret + 1, i) >= 0)
- pfomask = 1 << pfo;
+ po->flags |= OPF_RMD;
+ scan_for_pop(i + 1, opcnt, po->operand[0].name,
+ i + opcnt * 4, 0, &depth, 1);
+ continue;
}
- if (pfomask) {
- tmp_op->pfomask |= pfomask;
- cmp_result_vars |= pfomask;
- po->datap = tmp_op;
+ ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0);
+ if (ret == 0) {
+ arg = OPF_RMD;
+ if (regmask & (1 << reg)) {
+ if (regmask_save & (1 << reg))
+ ferr(po, "%s already saved?\n", po->operand[0].name);
+ arg = OPF_RSAVE;
+ }
+ po->flags |= arg;
+ scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, arg);
+ continue;
}
+ }
- if (po->op == OP_ADC || po->op == OP_SBB)
- cmp_result_vars |= 1 << PFO_C;
+ regmask_now = po->regmask_src | po->regmask_dst;
+ if (regmask_now & (1 << xBP)) {
+ if (g_bp_frame && !(po->flags & OPF_EBP_S)) {
+ if (po->regmask_dst & (1 << xBP))
+ // compiler decided to drop bp frame and use ebp as scratch
+ scan_fwd_set_flags(i, opcnt, i + opcnt * 5, OPF_EBP_S);
+ else
+ regmask_now &= ~(1 << xBP);
+ }
}
- else if (po->op == OP_CALL)
+
+ regmask |= regmask_now;
+
+ if (po->flags & OPF_CC)
{
- pp = malloc(sizeof(*pp));
- my_assert_not(pp, NULL);
- tmpname = opr_name(&ops[i], 0);
- ret = proto_parse(fhdr, tmpname, pp);
- if (ret)
- ferr(po, "proto_parse failed for '%s'\n", tmpname);
+ int setters[16], cnt = 0, branched = 0;
- for (arg = 0; arg < pp->argc; arg++)
- if (pp->arg[arg].reg == NULL)
- break;
+ ret = scan_for_flag_set(i, i + opcnt * 6,
+ &branched, setters, &cnt);
+ if (ret < 0 || cnt <= 0)
+ ferr(po, "unable to trace flag setter(s)\n");
+ if (cnt > ARRAY_SIZE(setters))
+ ferr(po, "too many flag setters\n");
- for (j = i - 1; j >= 0 && arg < pp->argc; j--) {
- if (ops[j].op == OP_CALL) {
- pp_tmp = ops[j].datap;
- if (pp_tmp == NULL)
- ferr(po, "arg collect hit unparsed call\n");
- if (pp_tmp->argc_stack > 0)
- ferr(po, "arg collect hit '%s' with %d stack args\n",
- opr_name(&ops[j], 0), pp_tmp->argc_stack);
+ pfo = split_cond(po, po->op, &dummy);
+ for (j = 0; j < cnt; j++)
+ {
+ tmp_op = &ops[setters[j]]; // flag setter
+ pfomask = 0;
+
+ // to get nicer code, we try to delay test and cmp;
+ // if we can't because of operand modification, or if we
+ // have math op, or branch, make it calculate flags explicitly
+ if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) {
+ if (branched || scan_for_mod(tmp_op, setters[j] + 1, i) >= 0)
+ pfomask = 1 << pfo;
}
- else if ((ops[j].flags & OPF_TAIL)
- || (ops[j].flags & (OPF_JMP|OPF_CC)) == OPF_JMP)
- {
- break;
+ else if (tmp_op->op == OP_CMPS) {
+ pfomask = 1 << PFO_Z;
}
-
- if (ops[j].op == OP_PUSH) {
- pp->arg[arg].datap = &ops[j];
- ret = scan_for_mod(&ops[j], j + 1, i);
- if (ret >= 0) {
- // mark this push as one that needs operand saving
- ops[j].argmask |= 1 << arg;
- save_arg_vars |= 1 << arg;
- }
- else
- ops[j].flags |= OPF_RMD;
-
- // next arg
- for (arg++; arg < pp->argc; arg++)
- if (pp->arg[arg].reg == NULL)
- break;
+ else {
+ // see if we'll be able to handle based on op result
+ if ((tmp_op->op != OP_AND && tmp_op->op != OP_OR
+ && pfo != PFO_Z && pfo != PFO_S && pfo != PFO_P)
+ || branched
+ || scan_for_mod_opr0(tmp_op, setters[j] + 1, i) >= 0)
+ pfomask = 1 << pfo;
}
-
- if (g_labels[j][0] != 0) {
- if (j > 0 && ((ops[j - 1].flags & OPF_TAIL)
- || (ops[j - 1].flags & (OPF_JMP|OPF_CC)) == OPF_JMP))
- {
- // follow the branch in reverse
- if (g_label_refs[j] == NULL)
- ferr(po, "no refs for '%s'?\n", g_labels[j]);
- if (g_label_refs[j]->lrl != NULL)
- ferr(po, "unhandled multiple fefs to '%s'\n", g_labels[j]);
- j = (g_label_refs[j] - ops) + 1;
- continue;
- }
- break;
+ if (pfomask) {
+ tmp_op->pfomask |= pfomask;
+ cmp_result_vars |= pfomask;
}
+ // note: may overwrite, currently not a problem
+ po->datap = tmp_op;
}
- if (arg < pp->argc)
- ferr(po, "arg collect failed for '%s'\n", tmpname);
- po->datap = pp;
+
+ if (po->op == OP_ADC || po->op == OP_SBB)
+ cmp_result_vars |= 1 << PFO_C;
}
else if (po->op == OP_MUL
|| (po->op == OP_IMUL && po->operand_cnt == 1))
{
need_mul_var = 1;
}
+ else if (po->op == OP_CALL && po->operand[0].type != OPT_LABEL) {
+ pp = po->datap;
+ my_assert_not(pp, NULL);
+ fprintf(fout, " %s (*icall%d)(", pp->ret_type.name, i);
+ for (j = 0; j < pp->argc; j++) {
+ if (j > 0)
+ fprintf(fout, ", ");
+ fprintf(fout, "%s a%d", pp->arg[j].type.name, j + 1);
+ }
+ fprintf(fout, ");\n");
+ }
+ }
+
+ // output LUTs/jumptables
+ for (i = 0; i < g_func_pd_cnt; i++) {
+ pd = &g_func_pd[i];
+ fprintf(fout, " static const ");
+ if (pd->type == OPT_OFFSET) {
+ fprintf(fout, "void *jt_%s[] =\n { ", pd->label);
+
+ for (j = 0; j < pd->count; j++) {
+ if (j > 0)
+ fprintf(fout, ", ");
+ fprintf(fout, "&&%s", pd->d[j].u.label);
+ }
+ }
+ else {
+ fprintf(fout, "%s %s[] =\n { ",
+ lmod_type_u(ops, pd->lmod), pd->label);
+
+ for (j = 0; j < pd->count; j++) {
+ if (j > 0)
+ fprintf(fout, ", ");
+ fprintf(fout, "%u", pd->d[j].u.val);
+ }
+ }
+ fprintf(fout, " };\n");
}
- // declare stack frame
- if (g_bp_stack)
+ // declare stack frame, va_arg
+ if (g_stack_fsz)
fprintf(fout, " union { u32 d[%d]; u16 w[%d]; u8 b[%d]; } sf;\n",
- (g_bp_stack + 3) / 4, (g_bp_stack + 1) / 2, g_bp_stack);
+ (g_stack_fsz + 3) / 4, (g_stack_fsz + 1) / 2, g_stack_fsz);
+
+ if (g_func_pp->is_vararg)
+ fprintf(fout, " va_list ap;\n");
// declare arg-registers
- for (i = 0; i < g_func_pp.argc; i++) {
- if (g_func_pp.arg[i].reg != NULL) {
+ for (i = 0; i < g_func_pp->argc; i++) {
+ if (g_func_pp->arg[i].reg != NULL) {
reg = char_array_i(regs_r32,
- ARRAY_SIZE(regs_r32), g_func_pp.arg[i].reg);
+ ARRAY_SIZE(regs_r32), g_func_pp->arg[i].reg);
if (reg < 0)
- ferr(ops, "arg '%s' is not a reg?\n", g_func_pp.arg[i].reg);
+ ferr(ops, "arg '%s' is not a reg?\n", g_func_pp->arg[i].reg);
regmask_arg |= 1 << reg;
fprintf(fout, " u32 %s = (u32)a%d;\n",
- g_func_pp.arg[i].reg, i + 1);
+ g_func_pp->arg[i].reg, i + 1);
had_decl = 1;
}
}
// declare other regs - special case for eax
- if (!((regmask | regmask_arg) & 1) && !IS(g_func_pp.ret_type, "void")) {
+ if (!((regmask | regmask_arg) & 1) && have_func_ret
+ && !IS(g_func_pp->ret_type.name, "void"))
+ {
fprintf(fout, " u32 eax = 0;\n");
had_decl = 1;
}
regmask &= ~regmask_arg;
- if (g_bp_frame)
- regmask &= ~(1 << xBP);
+ regmask &= ~(1 << xSP);
if (regmask) {
for (reg = 0; reg < 8; reg++) {
if (regmask & (1 << reg)) {
}
}
+ if (regmask_save) {
+ for (reg = 0; reg < 8; reg++) {
+ if (regmask_save & (1 << reg)) {
+ fprintf(fout, " u32 s_%s;\n", regs_r32[reg]);
+ had_decl = 1;
+ }
+ }
+ }
+
if (save_arg_vars) {
for (reg = 0; reg < 32; reg++) {
if (save_arg_vars & (1 << reg)) {
if (had_decl)
fprintf(fout, "\n");
+ if (g_func_pp->is_vararg) {
+ if (g_func_pp->argc_stack == 0)
+ ferr(ops, "vararg func without stack args?\n");
+ fprintf(fout, " va_start(ap, a%d);\n", g_func_pp->argc);
+ }
+
// output ops
for (i = 0; i < opcnt; i++)
{
- if (g_labels[i][0] != 0)
+ if (g_labels[i][0] != 0 && g_label_refs[i].i != -1) {
fprintf(fout, "\n%s:\n", g_labels[i]);
+ label_pending = 1;
+
+ delayed_flag_op = NULL;
+ last_arith_dst = NULL;
+ }
po = &ops[i];
if (po->flags & OPF_RMD)
int is_inv = 0;
pfo = split_cond(po, po->op, &is_inv);
+ tmp_op = po->datap;
// we go through all this trouble to avoid using parsed_flag_op,
// which makes generated code much nicer
is_delayed = 1;
}
else if (last_arith_dst != NULL
- && (pfo == PFO_Z || pfo == PFO_S || pfo == PFO_P))
+ && (pfo == PFO_Z || pfo == PFO_S || pfo == PFO_P
+ || (tmp_op && (tmp_op->op == OP_AND || tmp_op->op == OP_OR))
+ ))
{
- out_src_opr(buf3, sizeof(buf3), po, last_arith_dst, 0);
+ out_src_opr_u32(buf3, sizeof(buf3), po, last_arith_dst);
out_test_for_cc(buf1, sizeof(buf1), po, pfo, is_inv,
last_arith_dst->lmod, buf3);
is_delayed = 1;
}
- else if (po->datap != NULL) {
- // use preprocessed results
- tmp_op = po->datap;
- if (!tmp_op || !(tmp_op->pfomask & (1 << pfo)))
+ else if (tmp_op != NULL) {
+ // use preprocessed flag calc results
+ if (!(tmp_op->pfomask & (1 << pfo)))
ferr(po, "not prepared for pfo %d\n", pfo);
// note: is_inv was not yet applied
case OP_MOV:
assert_operand_cnt(2);
propagate_lmod(po, &po->operand[0], &po->operand[1]);
- fprintf(fout, " %s = %s;",
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
+ fprintf(fout, " %s = %s;", buf1,
+ out_src_opr(buf2, sizeof(buf2), po, &po->operand[1],
+ po->operand[0].is_ptr ? "(void *)" : "", 0));
break;
case OP_LEA:
po->operand[1].lmod = OPLM_DWORD; // always
fprintf(fout, " %s = %s;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 1));
+ out_src_opr(buf2, sizeof(buf2), po, &po->operand[1],
+ NULL, 1));
break;
case OP_MOVZX:
assert_operand_cnt(2);
fprintf(fout, " %s = %s;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
break;
case OP_MOVSX:
fprintf(fout, " %s = %s%s;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
buf3,
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
break;
case OP_NOT:
assert_operand_cnt(2);
fprintf(fout, " %s = (s32)%s >> 31;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
strcpy(g_comment, "cdq");
break;
if (po->flags & OPF_REP) {
fprintf(fout, " for (; ecx != 0; ecx--, edi += %d)\n",
lmod_bytes(po, po->operand[0].lmod));
- fprintf(fout, " *(u32 *)edi = eax;");
+ fprintf(fout, " %sedi = eax;",
+ lmod_cast_u_ptr(po, po->operand[0].lmod));
strcpy(g_comment, "rep stos");
}
else {
- fprintf(fout, " *(u32 *)edi = eax; edi += %d;",
+ fprintf(fout, " %sedi = eax; edi += %d;",
+ lmod_cast_u_ptr(po, po->operand[0].lmod),
lmod_bytes(po, po->operand[0].lmod));
strcpy(g_comment, "stos");
}
break;
+ case OP_MOVS:
+ // assumes DF=0
+ assert_operand_cnt(3);
+ j = lmod_bytes(po, po->operand[0].lmod);
+ strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod));
+ if (po->flags & OPF_REP) {
+ fprintf(fout,
+ " for (; ecx != 0; ecx--, edi += %d, esi += %d)\n",
+ j, j);
+ fprintf(fout,
+ " %sedi = %sesi;", buf1, buf1);
+ strcpy(g_comment, "rep movs");
+ }
+ else {
+ fprintf(fout, " %sedi = %sesi; edi += %d; esi += %d;",
+ buf1, buf1, j, j);
+ strcpy(g_comment, "movs");
+ }
+ break;
+
+ case OP_CMPS:
+ // assumes DF=0
+ // repe ~ repeat while ZF=1
+ assert_operand_cnt(3);
+ j = lmod_bytes(po, po->operand[0].lmod);
+ strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod));
+ if (po->flags & OPF_REP) {
+ fprintf(fout,
+ " for (; ecx != 0; ecx--, edi += %d, esi += %d)\n",
+ j, j);
+ fprintf(fout,
+ " if ((cond_z = (%sedi == %sesi)) %s 0)\n",
+ buf1, buf1, (po->flags & OPF_REPZ) ? "==" : "!=");
+ fprintf(fout,
+ " break;");
+ snprintf(g_comment, sizeof(g_comment), "rep%s cmps",
+ (po->flags & OPF_REPZ) ? "e" : "ne");
+ }
+ else {
+ fprintf(fout,
+ " cond_z = (%sedi = %sesi); edi += %d; esi += %d;",
+ buf1, buf1, j, j);
+ strcpy(g_comment, "cmps");
+ }
+ pfomask &= ~(1 << PFO_Z);
+ last_arith_dst = NULL;
+ delayed_flag_op = NULL;
+ break;
+
// arithmetic w/flags
case OP_ADD:
case OP_SUB:
case OP_OR:
propagate_lmod(po, &po->operand[0], &po->operand[1]);
// fallthrough
- case OP_SHL:
- case OP_SHR:
dualop_arith:
assert_operand_cnt(2);
fprintf(fout, " %s %s= %s;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
op_to_c(po),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
+ output_std_flags(fout, po, &pfomask, buf1);
+ last_arith_dst = &po->operand[0];
+ delayed_flag_op = NULL;
+ break;
+
+ case OP_SHL:
+ case OP_SHR:
+ assert_operand_cnt(2);
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
+ if (pfomask & (1 << PFO_C)) {
+ if (po->operand[1].type == OPT_CONST) {
+ l = lmod_bytes(po, po->operand[0].lmod) * 8;
+ j = po->operand[1].val;
+ j %= l;
+ if (j != 0) {
+ if (po->op == OP_SHL)
+ j = l - j;
+ else
+ j -= 1;
+ fprintf(fout, " cond_c = (%s & 0x%02x) ? 1 : 0;\n",
+ buf1, 1 << j);
+ }
+ else
+ ferr(po, "zero shift?\n");
+ }
+ else
+ ferr(po, "TODO\n");
+ pfomask &= ~(1 << PFO_C);
+ }
+ fprintf(fout, " %s %s= %s;", buf1, op_to_c(po),
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
+ output_std_flags(fout, po, &pfomask, buf1);
+ last_arith_dst = &po->operand[0];
+ delayed_flag_op = NULL;
+ break;
+
+ case OP_SAR:
+ assert_operand_cnt(2);
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
+ fprintf(fout, " %s = %s%s >> %s;", buf1,
+ lmod_cast_s(po, po->operand[0].lmod), buf1,
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
+ output_std_flags(fout, po, &pfomask, buf1);
+ last_arith_dst = &po->operand[0];
+ delayed_flag_op = NULL;
+ break;
+
+ case OP_ROL:
+ case OP_ROR:
+ assert_operand_cnt(2);
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
+ if (po->operand[1].type == OPT_CONST) {
+ j = po->operand[1].val;
+ j %= lmod_bytes(po, po->operand[0].lmod) * 8;
+ fprintf(fout, po->op == OP_ROL ?
+ " %s = (%s << %d) | (%s >> %d);" :
+ " %s = (%s >> %d) | (%s << %d);",
+ buf1, buf1, j, buf1,
+ lmod_bytes(po, po->operand[0].lmod) * 8 - j);
+ }
+ else
+ ferr(po, "TODO\n");
+ output_std_flags(fout, po, &pfomask, buf1);
last_arith_dst = &po->operand[0];
delayed_flag_op = NULL;
break;
}
goto dualop_arith;
- case OP_SAR:
- assert_operand_cnt(2);
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
- fprintf(fout, " %s = %s%s >> %s;", buf1,
- lmod_cast_s(po, po->operand[0].lmod), buf1,
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
- last_arith_dst = &po->operand[0];
- delayed_flag_op = NULL;
- break;
-
case OP_ADC:
case OP_SBB:
assert_operand_cnt(2);
propagate_lmod(po, &po->operand[0], &po->operand[1]);
- fprintf(fout, " %s %s= %s + cond_c;",
+ if (po->op == OP_SBB
+ && IS(po->operand[0].name, po->operand[1].name))
+ {
+ // avoid use of unitialized var
+ fprintf(fout, " %s = -cond_c;",
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]));
+ }
+ else {
+ fprintf(fout, " %s %s= %s + cond_c;",
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
op_to_c(po),
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
+ }
last_arith_dst = &po->operand[0];
delayed_flag_op = NULL;
break;
case OP_INC:
case OP_DEC:
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
- strcpy(buf2, po->op == OP_INC ? "++" : "--");
- fprintf(fout, " %s%s;", buf1, buf2);
+ if (po->operand[0].type == OPT_REG) {
+ strcpy(buf2, po->op == OP_INC ? "++" : "--");
+ fprintf(fout, " %s%s;", buf1, buf2);
+ }
+ else {
+ strcpy(buf2, po->op == OP_INC ? "+" : "-");
+ fprintf(fout, " %s %s= 1;", buf1, buf2);
+ }
last_arith_dst = &po->operand[0];
delayed_flag_op = NULL;
break;
case OP_NEG:
out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0);
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]);
fprintf(fout, " %s = -%s%s;", buf1,
lmod_cast_s(po, po->operand[0].lmod), buf2);
last_arith_dst = &po->operand[0];
break;
case OP_IMUL:
- if (po->operand_cnt == 2)
+ if (po->operand_cnt == 2) {
+ propagate_lmod(po, &po->operand[0], &po->operand[1]);
goto dualop_arith;
+ }
if (po->operand_cnt == 3)
ferr(po, "TODO imul3\n");
// fallthrough
assert_operand_cnt(1);
strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)");
fprintf(fout, " mul_tmp = %seax * %s%s;\n", buf1, buf1,
- out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0));
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]));
fprintf(fout, " edx = mul_tmp >> 32;\n");
fprintf(fout, " eax = mul_tmp;");
last_arith_dst = NULL;
ferr(po, "unhandled lmod %d\n", po->operand[0].lmod);
// 32bit division is common, look for it
- if (scan_for_cdq_edx(i - 1) >= 0) {
- out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0);
+ if (po->op == OP_DIV)
+ ret = scan_for_reg_clear(i - 1, xDX);
+ else
+ ret = scan_for_cdq_edx(i - 1);
+ if (ret >= 0) {
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
strcpy(buf2, lmod_cast(po, po->operand[0].lmod,
po->op == OP_IDIV));
fprintf(fout, " edx = %seax %% %s%s;\n", buf2, buf2, buf1);
}
else
no_output = 1;
+ last_arith_dst = NULL;
delayed_flag_op = po;
break;
case OP_JMP:
assert_operand_cnt(1);
- if (po->operand[0].type != OPT_LABEL)
- ferr(po, "unhandled call type\n");
+ last_arith_dst = NULL;
+ delayed_flag_op = NULL;
+
+ if (po->operand[0].type == OPT_REGMEM) {
+ ret = sscanf(po->operand[0].name, "%[^[][%[^*]*4]",
+ buf1, buf2);
+ if (ret != 2)
+ ferr(po, "parse failure for jmp '%s'\n",
+ po->operand[0].name);
+ fprintf(fout, " goto *jt_%s[%s];", buf1, buf2);
+ break;
+ }
+ else if (po->operand[0].type != OPT_LABEL)
+ ferr(po, "unhandled jmp type\n");
fprintf(fout, " goto %s;", po->operand[0].name);
break;
case OP_CALL:
assert_operand_cnt(1);
- if (po->operand[0].type != OPT_LABEL)
- ferr(po, "unhandled call type\n");
-
pp = po->datap;
if (pp == NULL)
ferr(po, "NULL pp\n");
+ if (po->operand[0].type != OPT_LABEL)
+ fprintf(fout, " icall%d = (void *)%s;\n", i,
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]));
+
fprintf(fout, " ");
- if (!IS(pp->ret_type, "void")) {
+ if (strstr(pp->ret_type.name, "int64")) {
if (po->flags & OPF_TAIL)
- fprintf(fout, "return ");
- else
+ ferr(po, "int64 and tail?\n");
+ fprintf(fout, "mul_tmp = ");
+ }
+ else if (!IS(pp->ret_type.name, "void")) {
+ if (po->flags & OPF_TAIL) {
+ if (!IS(g_func_pp->ret_type.name, "void")) {
+ fprintf(fout, "return ");
+ if (g_func_pp->ret_type.is_ptr != pp->ret_type.is_ptr)
+ fprintf(fout, "(%s)", g_func_pp->ret_type.name);
+ }
+ }
+ else {
fprintf(fout, "eax = ");
- if (strchr(pp->ret_type, '*'))
- fprintf(fout, "(u32)");
+ if (pp->ret_type.is_ptr)
+ fprintf(fout, "(u32)");
+ }
+ }
+
+ if (po->operand[0].type != OPT_LABEL) {
+ fprintf(fout, "icall%d(", i);
+ }
+ else {
+ if (pp->name[0] == 0)
+ ferr(po, "missing pp->name\n");
+ fprintf(fout, "%s%s(", pp->name,
+ pp->has_structarg ? "_sa" : "");
}
- fprintf(fout, "%s(", opr_name(po, 0));
for (arg = 0; arg < pp->argc; arg++) {
if (arg > 0)
fprintf(fout, ", ");
- if (strchr(pp->arg[arg].type, '*'))
- fprintf(fout, "(%s)", pp->arg[arg].type);
+ cast[0] = 0;
+ if (pp->arg[arg].type.is_ptr)
+ snprintf(cast, sizeof(cast), "(%s)", pp->arg[arg].type.name);
if (pp->arg[arg].reg != NULL) {
- fprintf(fout, "%s", pp->arg[arg].reg);
+ fprintf(fout, "%s%s", cast, pp->arg[arg].reg);
continue;
}
tmp_op = pp->arg[arg].datap;
if (tmp_op == NULL)
ferr(po, "parsed_op missing for arg%d\n", arg);
- if (tmp_op->argmask) {
- fprintf(fout, "s_a%d", arg + 1);
+ if (tmp_op->argnum != 0) {
+ fprintf(fout, "%ss_a%d", cast, tmp_op->argnum);
}
else {
fprintf(fout, "%s",
out_src_opr(buf1, sizeof(buf1),
- tmp_op, &tmp_op->operand[0], 0));
+ tmp_op, &tmp_op->operand[0], cast, 0));
}
}
fprintf(fout, ");");
+ if (strstr(pp->ret_type.name, "int64")) {
+ fprintf(fout, "\n");
+ fprintf(fout, " edx = mul_tmp >> 32;\n");
+ fprintf(fout, " eax = mul_tmp;");
+ }
+
if (po->flags & OPF_TAIL) {
strcpy(g_comment, "tailcall");
- if (IS(pp->ret_type, "void"))
+ ret = 0;
+ if (i == opcnt - 1)
+ ret = 0;
+ else if (IS(pp->ret_type.name, "void"))
+ ret = 1;
+ else if (IS(g_func_pp->ret_type.name, "void"))
+ ret = 1;
+ // else already handled as 'return f()'
+
+ if (ret) {
fprintf(fout, "\n return;");
+ strcpy(g_comment, "^ tailcall");
+ }
}
delayed_flag_op = NULL;
last_arith_dst = NULL;
break;
case OP_RET:
- if (IS(g_func_pp.ret_type, "void"))
- fprintf(fout, " return;");
+ if (g_func_pp->is_vararg)
+ fprintf(fout, " va_end(ap);\n");
+
+ if (IS(g_func_pp->ret_type.name, "void")) {
+ if (i != opcnt - 1 || label_pending)
+ fprintf(fout, " return;");
+ }
+ else if (g_func_pp->ret_type.is_ptr) {
+ fprintf(fout, " return (%s)eax;",
+ g_func_pp->ret_type.name);
+ }
else
fprintf(fout, " return eax;");
+
+ last_arith_dst = NULL;
+ delayed_flag_op = NULL;
break;
case OP_PUSH:
- if (po->argmask) {
+ if (po->argnum != 0) {
// special case - saved func arg
- for (j = 0; j < 32; j++) {
- if (po->argmask & (1 << j)) {
- fprintf(fout, " s_a%d = %s;", j + 1,
- out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0));
- }
- }
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
+ fprintf(fout, " s_a%d = %s;", po->argnum, buf1);
+ break;
+ }
+ else if (po->flags & OPF_RSAVE) {
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
+ fprintf(fout, " s_%s = %s;", buf1, buf1);
break;
}
- ferr(po, "push encountered\n");
+ if (!(g_ida_func_attr & IDAFA_NORETURN))
+ ferr(po, "stray push encountered\n");
+ no_output = 1;
break;
case OP_POP:
- ferr(po, "pop encountered\n");
+ if (po->flags & OPF_RSAVE) {
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
+ fprintf(fout, " %s = s_%s;", buf1, buf1);
+ break;
+ }
+ ferr(po, "stray pop encountered\n");
break;
case OP_NOP:
+ no_output = 1;
break;
default:
if (!no_output)
fprintf(fout, "\n");
+ // some sanity checking
+ if ((po->flags & OPF_REP) && po->op != OP_STOS
+ && po->op != OP_MOVS && po->op != OP_CMPS)
+ ferr(po, "unexpected rep\n");
+ if ((po->flags & (OPF_REPZ|OPF_REPNZ)) && po->op != OP_CMPS)
+ ferr(po, "unexpected repz/repnz\n");
+
if (pfomask != 0)
- ferr(po, "missed flag calc, pfomask=%x\n", pfomask);
+ ferr(po, "missed flag calc, pfomask=%x\n", pfomask);
// see is delayed flag stuff is still valid
if (delayed_flag_op != NULL && delayed_flag_op != po) {
if (is_opr_modified(last_arith_dst, po))
last_arith_dst = NULL;
}
+
+ label_pending = 0;
}
fprintf(fout, "}\n\n");
// cleanup
for (i = 0; i < opcnt; i++) {
+ struct label_ref *lr, *lr_del;
+
+ lr = g_label_refs[i].next;
+ while (lr != NULL) {
+ lr_del = lr;
+ lr = lr->next;
+ free(lr_del);
+ }
+ g_label_refs[i].i = -1;
+ g_label_refs[i].next = NULL;
+
if (ops[i].op == OP_CALL) {
pp = ops[i].datap;
- if (pp) {
+ if (pp)
proto_release(pp);
- free(pp);
- }
}
}
- proto_release(&g_func_pp);
+ g_func_pp = NULL;
+}
+
+static void set_label(int i, const char *name)
+{
+ const char *p;
+ int len;
+
+ len = strlen(name);
+ p = strchr(name, ':');
+ if (p != NULL)
+ len = p - name;
+
+ if (len > sizeof(g_labels[0]) - 1)
+ aerr("label '%s' too long: %d\n", name, len);
+ if (g_labels[i][0] != 0 && !IS_START(g_labels[i], "algn_"))
+ aerr("dupe label '%s' vs '%s'?\n", name, g_labels[i]);
+ memcpy(g_labels[i], name, len);
+ g_labels[i][len] = 0;
+}
+
+// '=' needs special treatment..
+static char *next_word_s(char *w, size_t wsize, char *s)
+{
+ size_t i;
+
+ s = sskip(s);
+
+ for (i = 0; i < wsize - 1; i++) {
+ if (s[i] == 0 || my_isblank(s[i]) || (s[i] == '=' && i > 0))
+ break;
+ w[i] = s[i];
+ }
+ w[i] = 0;
+
+ if (s[i] != 0 && !my_isblank(s[i]) && s[i] != '=')
+ printf("warning: '%s' truncated\n", w);
+
+ return s + i;
+}
+
+struct chunk_item {
+ char *name;
+ long fptr;
+ int asmln;
+};
+
+static int cmp_chunks(const void *p1, const void *p2)
+{
+ const struct chunk_item *c1 = p1, *c2 = p2;
+ return strcmp(c1->name, c2->name);
+}
+
+static int cmpstringp(const void *p1, const void *p2)
+{
+ return strcmp(*(char * const *)p1, *(char * const *)p2);
}
int main(int argc, char *argv[])
{
- FILE *fout, *fasm, *fhdr;
+ FILE *fout, *fasm, *frlist;
+ struct parsed_data *pd = NULL;
+ int pd_alloc = 0;
+ char **rlist = NULL;
+ int rlist_len = 0;
+ int rlist_alloc = 0;
+ struct chunk_item *func_chunks;
+ int func_chunks_used = 0;
+ int func_chunks_sorted = 0;
+ int func_chunk_cnt = 0;
+ int func_chunk_alloc;
+ int func_chunk_i = -1;
+ long func_chunk_ret = 0;
+ int func_chunk_ret_ln = 0;
char line[256];
char words[16][256];
+ enum opr_lenmod lmod;
int in_func = 0;
+ int pending_endp = 0;
+ int skip_func = 0;
int skip_warned = 0;
int eq_alloc;
+ int verbose = 0;
+ int arg_out;
+ int arg = 1;
int pi = 0;
- int len;
+ int i, j;
+ int ret, len;
char *p;
int wordc;
- if (argc != 4) {
- printf("usage:\n%s <.c> <.asm> <hdrf>\n",
+ if (argv[1] && IS(argv[1], "-v")) {
+ verbose = 1;
+ arg++;
+ }
+
+ if (argc < arg + 3) {
+ printf("usage:\n%s [-v] <.c> <.asm> <hdrf> [rlist]*\n",
argv[0]);
return 1;
}
- hdrfn = argv[3];
- fhdr = fopen(hdrfn, "r");
- my_assert_not(fhdr, NULL);
+ arg_out = arg++;
- asmfn = argv[2];
+ asmfn = argv[arg++];
fasm = fopen(asmfn, "r");
my_assert_not(fasm, NULL);
- fout = fopen(argv[1], "w");
+ hdrfn = argv[arg++];
+ g_fhdr = fopen(hdrfn, "r");
+ my_assert_not(g_fhdr, NULL);
+
+ rlist_alloc = 64;
+ rlist = malloc(rlist_alloc * sizeof(rlist[0]));
+ my_assert_not(rlist, NULL);
+ // needs special handling..
+ rlist[rlist_len++] = "__alloca_probe";
+
+ func_chunk_alloc = 32;
+ func_chunks = malloc(func_chunk_alloc * sizeof(func_chunks[0]));
+ my_assert_not(func_chunks, NULL);
+
+ for (; arg < argc; arg++) {
+ frlist = fopen(argv[arg], "r");
+ my_assert_not(frlist, NULL);
+
+ while (fgets(line, sizeof(line), frlist)) {
+ p = sskip(line);
+ if (*p == 0 || *p == ';' || *p == '#')
+ continue;
+
+ p = next_word(words[0], sizeof(words[0]), p);
+ if (words[0][0] == 0)
+ continue;
+
+ if (rlist_len >= rlist_alloc) {
+ rlist_alloc = rlist_alloc * 2 + 64;
+ rlist = realloc(rlist, rlist_alloc * sizeof(rlist[0]));
+ my_assert_not(rlist, NULL);
+ }
+ rlist[rlist_len++] = strdup(words[0]);
+ }
+
+ fclose(frlist);
+ frlist = NULL;
+ }
+
+ if (rlist_len > 0)
+ qsort(rlist, rlist_len, sizeof(rlist[0]), cmpstringp);
+
+ fout = fopen(argv[arg_out], "w");
my_assert_not(fout, NULL);
eq_alloc = 128;
g_eqs = malloc(eq_alloc * sizeof(g_eqs[0]));
my_assert_not(g_eqs, NULL);
+ for (i = 0; i < ARRAY_SIZE(g_label_refs); i++) {
+ g_label_refs[i].i = -1;
+ g_label_refs[i].next = NULL;
+ }
+
while (fgets(line, sizeof(line), fasm))
{
+ wordc = 0;
asmln++;
p = sskip(line);
- if (*p == 0 || *p == ';')
+ if (*p == 0)
+ continue;
+
+ // get rid of random tabs
+ for (i = 0; line[i] != 0; i++)
+ if (line[i] == '\t')
+ line[i] = ' ';
+
+ if (*p == ';')
+ {
+ if (p[2] == '=' && IS_START(p, "; =============== S U B"))
+ goto do_pending_endp; // eww..
+
+ if (p[2] == 'A' && IS_START(p, "; Attributes:"))
+ {
+ static const char *attrs[] = {
+ "bp-based frame",
+ "library function",
+ "static",
+ "noreturn",
+ "thunk",
+ "fpd=",
+ };
+
+ // parse IDA's attribute-list comment
+ g_ida_func_attr = 0;
+ p = sskip(p + 13);
+
+ for (; *p != 0; p = sskip(p)) {
+ for (i = 0; i < ARRAY_SIZE(attrs); i++) {
+ if (!strncmp(p, attrs[i], strlen(attrs[i]))) {
+ g_ida_func_attr |= 1 << i;
+ p += strlen(attrs[i]);
+ break;
+ }
+ }
+ if (i == ARRAY_SIZE(attrs)) {
+ anote("unparsed IDA attr: %s\n", p);
+ break;
+ }
+ if (IS(attrs[i], "fpd=")) {
+ p = next_word(words[0], sizeof(words[0]), p);
+ // ignore for now..
+ }
+ }
+ }
+ else if (p[2] == 'S' && IS_START(p, "; START OF FUNCTION CHUNK FOR "))
+ {
+ p += 30;
+ next_word(words[0], sizeof(words[0]), p);
+ if (words[0][0] == 0)
+ aerr("missing nam for func chunk?\n");
+ if (func_chunk_cnt >= func_chunk_alloc) {
+ func_chunk_alloc *= 2;
+ func_chunks = realloc(func_chunks,
+ func_chunk_alloc * sizeof(func_chunks[0]));
+ my_assert_not(func_chunks, NULL);
+ }
+ func_chunks[func_chunk_cnt].fptr = ftell(fasm);
+ func_chunks[func_chunk_cnt].name = strdup(words[0]);
+ func_chunks[func_chunk_cnt].asmln = asmln;
+ func_chunk_cnt++;
+ func_chunks_sorted = 0;
+ }
+ else if (p[2] == 'E' && IS_START(p, "; END OF FUNCTION CHUNK"))
+ {
+ if (func_chunk_i >= 0) {
+ if (func_chunk_i < func_chunk_cnt
+ && IS(func_chunks[func_chunk_i].name, g_func))
+ {
+ // move on to next chunk
+ ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET);
+ if (ret)
+ aerr("seek failed for '%s' chunk #%d\n",
+ g_func, func_chunk_i);
+ asmln = func_chunks[func_chunk_i].asmln;
+ func_chunk_i++;
+ }
+ else {
+ if (func_chunk_ret == 0)
+ aerr("no return from chunk?\n");
+ fseek(fasm, func_chunk_ret, SEEK_SET);
+ asmln = func_chunk_ret_ln;
+ func_chunk_ret = 0;
+ pending_endp = 1;
+ }
+ }
+ }
+ else if (p[2] == 'F' && IS_START(p, "; FUNCTION CHUNK AT ")) {
+ func_chunks_used = 1;
+ p += 20;
+ if (IS_START(g_func, "sub_")) {
+ unsigned long addr = strtoul(p, NULL, 16);
+ unsigned long f_addr = strtoul(g_func + 4, NULL, 16);
+ if (addr > f_addr)
+ aerr("need a chunk %lX that is after %s\n", addr, g_func);
+ }
+ }
continue;
+ } // *p == ';'
+parse_words:
memset(words, 0, sizeof(words));
for (wordc = 0; wordc < 16; wordc++) {
- p = sskip(next_word(words[wordc], sizeof(words[0]), p));
+ p = sskip(next_word_s(words[wordc], sizeof(words[0]), p));
if (*p == 0 || *p == ';') {
wordc++;
break;
}
}
+ // alow asm patches in comments
+ if (*p == ';' && IS_START(p, "; sctpatch:")) {
+ p = sskip(p + 11);
+ if (*p == 0 || *p == ';')
+ continue;
+ goto parse_words; // lame
+ }
+
if (wordc == 0) {
// shouldn't happen
awarn("wordc == 0?\n");
continue;
}
+do_pending_endp:
+ // do delayed endp processing to collect switch jumptables
+ if (pending_endp) {
+ if (in_func && !skip_func && wordc >= 2
+ && ((words[0][0] == 'd' && words[0][2] == 0)
+ || (words[1][0] == 'd' && words[1][2] == 0)))
+ {
+ i = 1;
+ if (words[1][0] == 'd' && words[1][2] == 0) {
+ // label
+ if (g_func_pd_cnt >= pd_alloc) {
+ pd_alloc = pd_alloc * 2 + 16;
+ g_func_pd = realloc(g_func_pd,
+ sizeof(g_func_pd[0]) * pd_alloc);
+ my_assert_not(g_func_pd, NULL);
+ }
+ pd = &g_func_pd[g_func_pd_cnt];
+ g_func_pd_cnt++;
+ memset(pd, 0, sizeof(*pd));
+ strcpy(pd->label, words[0]);
+ pd->type = OPT_CONST;
+ pd->lmod = lmod_from_directive(words[1]);
+ i = 2;
+ }
+ else {
+ lmod = lmod_from_directive(words[0]);
+ if (lmod != pd->lmod)
+ aerr("lmod change? %d->%d\n", pd->lmod, lmod);
+ }
+
+ if (pd->count_alloc < pd->count + wordc) {
+ pd->count_alloc = pd->count_alloc * 2 + 14 + wordc;
+ pd->d = realloc(pd->d, sizeof(pd->d[0]) * pd->count_alloc);
+ my_assert_not(pd->d, NULL);
+ }
+ for (; i < wordc; i++) {
+ if (IS(words[i], "offset")) {
+ pd->type = OPT_OFFSET;
+ i++;
+ }
+ p = strchr(words[i], ',');
+ if (p != NULL)
+ *p = 0;
+ if (pd->type == OPT_OFFSET)
+ pd->d[pd->count].u.label = strdup(words[i]);
+ else
+ pd->d[pd->count].u.val = parse_number(words[i]);
+ pd->d[pd->count].bt_i = -1;
+ pd->count++;
+ }
+ continue;
+ }
+
+ if (in_func && !skip_func)
+ gen_func(fout, g_fhdr, g_func, pi);
+
+ pending_endp = 0;
+ in_func = 0;
+ g_ida_func_attr = 0;
+ skip_warned = 0;
+ skip_func = 0;
+ g_func[0] = 0;
+ func_chunks_used = 0;
+ func_chunk_i = -1;
+ if (pi != 0) {
+ memset(&ops, 0, pi * sizeof(ops[0]));
+ memset(g_labels, 0, pi * sizeof(g_labels[0]));
+ pi = 0;
+ }
+ g_eqcnt = 0;
+ for (i = 0; i < g_func_pd_cnt; i++) {
+ pd = &g_func_pd[i];
+ if (pd->type == OPT_OFFSET) {
+ for (j = 0; j < pd->count; j++)
+ free(pd->d[j].u.label);
+ }
+ free(pd->d);
+ pd->d = NULL;
+ }
+ g_func_pd_cnt = 0;
+ pd = NULL;
+ if (wordc == 0)
+ continue;
+ }
+
if (IS(words[1], "proc")) {
if (in_func)
aerr("proc '%s' while in_func '%s'?\n",
words[0], g_func);
+ p = words[0];
+ if ((g_ida_func_attr & IDAFA_THUNK)
+ || bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp))
+ skip_func = 1;
strcpy(g_func, words[0]);
+ set_label(0, words[0]);
in_func = 1;
continue;
}
- if (IS(words[1], "endp")) {
+ if (IS(words[1], "endp"))
+ {
if (!in_func)
aerr("endp '%s' while not in_func?\n", words[0]);
if (!IS(g_func, words[0]))
aerr("endp '%s' while in_func '%s'?\n",
words[0], g_func);
- gen_func(fout, fhdr, g_func, pi);
- in_func = 0;
- skip_warned = 0;
- g_func[0] = 0;
- if (pi != 0) {
- memset(&ops, 0, pi * sizeof(ops[0]));
- memset(g_labels, 0, pi * sizeof(g_labels[0]));
- memset(g_label_refs, 0, pi * sizeof(g_label_refs[0]));
- pi = 0;
+
+ if (!skip_func && func_chunks_used) {
+ // start processing chunks
+ struct chunk_item *ci, key = { g_func, 0 };
+
+ func_chunk_ret = ftell(fasm);
+ func_chunk_ret_ln = asmln;
+ if (!func_chunks_sorted) {
+ qsort(func_chunks, func_chunk_cnt,
+ sizeof(func_chunks[0]), cmp_chunks);
+ func_chunks_sorted = 1;
+ }
+ ci = bsearch(&key, func_chunks, func_chunk_cnt,
+ sizeof(func_chunks[0]), cmp_chunks);
+ if (ci == NULL)
+ aerr("'%s' needs chunks, but none found\n", g_func);
+ func_chunk_i = ci - func_chunks;
+ for (; func_chunk_i > 0; func_chunk_i--)
+ if (!IS(func_chunks[func_chunk_i - 1].name, g_func))
+ break;
+
+ ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET);
+ if (ret)
+ aerr("seek failed for '%s' chunk #%d\n", g_func, func_chunk_i);
+ asmln = func_chunks[func_chunk_i].asmln;
+ func_chunk_i++;
+ continue;
}
- g_eqcnt = 0;
+ pending_endp = 1;
+ continue;
+ }
+
+ p = strchr(words[0], ':');
+ if (p != NULL) {
+ set_label(pi, words[0]);
+ continue;
+ }
+
+ if (!in_func || skip_func) {
+ if (!skip_warned && !skip_func && g_labels[pi][0] != 0) {
+ if (verbose)
+ anote("skipping from '%s'\n", g_labels[pi]);
+ skip_warned = 1;
+ }
+ g_labels[pi][0] = 0;
continue;
}
- if (IS(words[1], "=")) {
+ if (wordc > 1 && IS(words[1], "=")) {
if (wordc != 5)
aerr("unhandled equ, wc=%d\n", wordc);
if (g_eqcnt >= eq_alloc) {
if (pi >= ARRAY_SIZE(ops))
aerr("too many ops\n");
- p = strchr(words[0], ':');
- if (p != NULL) {
- len = p - words[0];
- if (len > sizeof(g_labels[0]) - 1)
- aerr("label too long: %d\n", len);
- if (g_labels[pi][0] != 0)
- aerr("dupe label?\n");
- memcpy(g_labels[pi], words[0], len);
- g_labels[pi][len] = 0;
- continue;
- }
-
- if (!in_func) {
- if (!skip_warned && g_labels[pi][0] != 0) {
- anote("skipping from '%s'\n", g_labels[pi]);
- skip_warned = 1;
- }
- g_labels[pi][0] = 0;
- continue;
- }
-
parse_op(&ops[pi], words, wordc);
pi++;
}
fclose(fout);
fclose(fasm);
- fclose(fhdr);
+ fclose(g_fhdr);
return 0;
}
notaz.gp2x.de / ia32rtools.git / blobdiff