/*
* ia32rtools
- * (C) notaz, 2013,2014
+ * (C) notaz, 2013-2015
*
* This work is licensed under the terms of 3-clause BSD license.
* See COPYING file in the top-level directory.
#include "masm_tools.h"
enum op_flags {
- OPF_RMD = (1 << 0), /* removed or optimized out */
+ OPF_RMD = (1 << 0), /* removed from code generation */
OPF_DATA = (1 << 1), /* data processing - writes to dst opr */
OPF_FLAGS = (1 << 2), /* sets flags */
OPF_JMP = (1 << 3), /* branch, call */
OPF_REP = (1 << 8), /* prefixed by rep */
OPF_REPZ = (1 << 9), /* rep is repe/repz */
OPF_REPNZ = (1 << 10), /* rep is repne/repnz */
- OPF_FARG = (1 << 11), /* push collected as func arg (no reuse) */
- OPF_EBP_S = (1 << 12), /* ebp used as scratch here, not BP */
- OPF_DF = (1 << 13), /* DF flag set */
- OPF_ATAIL = (1 << 14), /* tail call with reused arg frame */
- OPF_32BIT = (1 << 15), /* 32bit division */
- OPF_LOCK = (1 << 16), /* op has lock prefix */
- OPF_VAPUSH = (1 << 17), /* vararg ptr push (as call arg) */
+ OPF_FARG = (1 << 11), /* push collected as func arg */
+ OPF_FARGNR = (1 << 12), /* push collected as func arg (no reuse) */
+ OPF_EBP_S = (1 << 13), /* ebp used as scratch here, not BP */
+ OPF_DF = (1 << 14), /* DF flag set */
+ OPF_ATAIL = (1 << 15), /* tail call with reused arg frame */
+ OPF_32BIT = (1 << 16), /* 32bit division */
+ OPF_LOCK = (1 << 17), /* op has lock prefix */
+ OPF_VAPUSH = (1 << 18), /* vararg ptr push (as call arg) */
+ OPF_DONE = (1 << 19), /* already fully handled by analysis */
+ OPF_PPUSH = (1 << 20), /* part of complex push-pop graph */
};
enum op_op {
// x87
// mmx
OP_EMMS,
+ // undefined
+ OP_UD2,
};
enum opr_type {
unsigned char pfo;
unsigned char pfo_inv;
unsigned char operand_cnt;
- unsigned char p_argnum; // push: altered before call arg #
- unsigned char p_argpass;// push: arg of host func
- unsigned char pad[3];
+ unsigned char p_argnum; // arg push: altered before call arg #
+ unsigned char p_arggrp; // arg push: arg group # for above
+ unsigned char p_argpass;// arg push: arg of host func
+ short p_argnext;// arg push: same arg pushed elsewhere or -1
int regmask_src; // all referensed regs
int regmask_dst;
int pfomask; // flagop: parsed_flag_op that can't be delayed
};
// datap:
-// OP_CALL - parser proto hint (str)
-// (OPF_CC) - point to one of (OPF_FLAGS) that affects cc op
-// OP_POP - point to OP_PUSH in push/pop pair
+// OP_CALL - parser proto hint (str)
+// (OPF_CC) - points to one of (OPF_FLAGS) that affects cc op
+// OP_PUSH - points to OP_POP in complex push/pop graph
+// OP_POP - points to OP_PUSH in simple push/pop pair
struct parsed_equ {
char name[64];
IDAFA_FPD = (1 << 5),
};
-#define MAX_OPS 4096
+// note: limited to 32k due to p_argnext
+#define MAX_OPS 4096
+#define MAX_ARG_GRP 2
static struct parsed_op ops[MAX_OPS];
static struct parsed_equ *g_eqs;
static int g_eqcnt;
-static char g_labels[MAX_OPS][48];
+static char *g_labels[MAX_OPS];
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_stack_frame_used;
static int g_stack_fsz;
static int g_ida_func_attr;
+static int g_skip_func;
static int g_allow_regfunc;
static int g_quiet_pp;
+static int g_header_mode;
#define ferr(op_, fmt, ...) do { \
printf("%s:%d: error: [%s] '%s': " fmt, asmfn, (op_)->asmln, g_func, \
printf("%s:%d: note: [%s] '%s': " fmt, asmfn, (op_)->asmln, g_func, \
dump_op(op_), ##__VA_ARGS__)
+#define ferr_assert(op_, cond) do { \
+ if (!(cond)) ferr(op_, "assertion '%s' failed on ln :%d\n", #cond, \
+ __LINE__); \
+} while (0)
+
const char *regs_r32[] = {
"eax", "ebx", "ecx", "edx", "esi", "edi", "ebp", "esp",
// not r32, but list here for easy parsing and printing
const struct parsed_type *c_type)
{
static const char *dword_types[] = {
- "int", "_DWORD", "UINT_PTR", "DWORD",
+ "uint32_t", "int", "_DWORD", "UINT_PTR", "DWORD",
"WPARAM", "LPARAM", "UINT", "__int32",
"LONG", "HIMC", "BOOL", "size_t",
"float",
// mmx
{ "emms", OP_EMMS, 0, 0, OPF_DATA },
{ "movq", OP_MOV, 2, 2, OPF_DATA },
+ // must be last
+ { "ud2", OP_UD2 },
};
static void parse_op(struct parsed_op *op, char words[16][256], int wordc)
break;
}
- if (i == ARRAY_SIZE(op_table))
- aerr("unhandled op: '%s'\n", words[0]);
+ if (i == ARRAY_SIZE(op_table)) {
+ if (!g_skip_func)
+ aerr("unhandled op: '%s'\n", words[0]);
+ i--; // OP_UD2
+ }
w++;
op->op = op_table[i].op;
op->regmask_src = op->regmask_dst = 0;
op->asmln = asmln;
+ if (op->op == OP_UD2)
+ return;
+
for (opr = 0; opr < op_table[i].maxopr; opr++) {
if (opr >= op_table[i].minopr && w >= wordc)
break;
&& op->operand[0].reg == op->operand[1].reg
&& IS(op->operand[0].name, op->operand[1].name)) // ! ah, al..
{
- op->flags |= OPF_RMD;
+ op->flags |= OPF_RMD | OPF_DONE;
op->regmask_src = op->regmask_dst = 0;
}
break;
char buf[16];
snprintf(buf, sizeof(buf), "%s+0", op->operand[0].name);
if (IS(buf, op->operand[1].name))
- op->flags |= OPF_RMD;
+ op->flags |= OPF_RMD | OPF_DONE;
}
break;
// fptrs must use 32bit args, callsite might have no information and
// lack a cast to smaller types, which results in incorrectly masked
// args passed (callee may assume masked args, it does on ARM)
- if (!pp->is_oslib) {
+ if (!pp->is_osinc) {
for (i = 0; i < pp->argc; i++) {
ret = guess_lmod_from_c_type(&tmp_lmod, &pp->arg[i].type);
if (ret && tmp_lmod != OPLM_DWORD)
return -1; // deadend
}
- if ((po->flags & OPF_RMD)
+ if ((po->flags & (OPF_RMD|OPF_DONE))
|| (po->op == OP_PUSH && po->p_argnum != 0)) // arg push
continue;
&& po->operand[0].type == OPT_REG
&& IS(po->operand[0].name, reg))
{
- if (po->op == OP_PUSH && !(po->flags & OPF_FARG)) {
+ if (po->op == OP_PUSH && !(po->flags & OPF_FARGNR)) {
depth++;
if (depth > *maxdepth)
*maxdepth = depth;
continue;
for (j = i - 1; j >= 0; j--) {
- if (ops[j].flags & OPF_RMD)
+ if (ops[j].flags & (OPF_RMD|OPF_DONE))
continue;
if (ops[j].flags & OPF_JMP)
return -1;
- if (ops[j].op == OP_POP && ops[j].operand[0].type == OPT_REG
+ if (ops[j].op == OP_POP && ops[j].datap == NULL
+ && ops[j].operand[0].type == OPT_REG
&& IS(ops[j].operand[0].name, reg))
{
found = 1;
break;
}
- if (g_labels[j][0] != 0)
+ if (g_labels[j] != NULL)
return -1;
}
}
return found ? 0 : -1;
}
+static void scan_for_pop_const(int i, int opcnt, int *regmask_pp)
+{
+ struct parsed_op *po;
+ int is_multipath = 0;
+ int j;
+
+ for (j = i + 1; j < opcnt; j++) {
+ po = &ops[j];
+
+ if (po->op == OP_JMP && po->btj == NULL) {
+ ferr_assert(po, po->bt_i >= 0);
+ j = po->bt_i - 1;
+ continue;
+ }
+
+ if ((po->flags & (OPF_JMP|OPF_TAIL|OPF_RSAVE))
+ || po->op == OP_PUSH)
+ {
+ break;
+ }
+
+ if (g_labels[j] != NULL)
+ is_multipath = 1;
+
+ if (po->op == OP_POP && !(po->flags & OPF_RMD))
+ {
+ is_multipath |= !!(po->flags & OPF_PPUSH);
+ if (is_multipath) {
+ ops[i].flags |= OPF_PPUSH | OPF_DONE;
+ ops[i].datap = po;
+ po->flags |= OPF_PPUSH | OPF_DONE;
+ *regmask_pp |= 1 << po->operand[0].reg;
+ }
+ else {
+ ops[i].flags |= OPF_RMD | OPF_DONE;
+ po->flags |= OPF_DONE;
+ po->datap = &ops[i];
+ }
+ break;
+ }
+ }
+}
+
static void scan_propagate_df(int i, int opcnt)
{
struct parsed_op *po = &ops[i];
break;
if (po->op == OP_CLD) {
- po->flags |= OPF_RMD;
+ po->flags |= OPF_RMD | OPF_DONE;
return;
}
}
}
ops[i].cc_scratch = magic;
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
*branched = 1;
lr = &g_label_refs[i];
static int scan_for_cdq_edx(int i)
{
while (i >= 0) {
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
if (g_label_refs[i].next != NULL)
return -1;
if (i > 0 && LAST_OP(i - 1)) {
static int scan_for_reg_clear(int i, int reg)
{
while (i >= 0) {
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
if (g_label_refs[i].next != NULL)
return -1;
if (i > 0 && LAST_OP(i - 1)) {
return -1;
}
+static void patch_esp_adjust(struct parsed_op *po, int adj)
+{
+ ferr_assert(po, po->op == OP_ADD);
+ ferr_assert(po, IS(opr_name(po, 0), "esp"));
+ ferr_assert(po, po->operand[1].type == OPT_CONST);
+
+ // this is a bit of a hack, but deals with use of
+ // single adj for multiple calls
+ po->operand[1].val -= adj;
+ po->flags |= OPF_RMD;
+ if (po->operand[1].val == 0)
+ po->flags |= OPF_DONE;
+ ferr_assert(po, (int)po->operand[1].val >= 0);
+}
+
// scan for positive, constant esp adjust
-static int scan_for_esp_adjust(int i, int opcnt, int *adj,
- int *multipath)
+// multipath case is preliminary
+static int scan_for_esp_adjust(int i, int opcnt,
+ int adj_expect, int *adj, int *is_multipath, int do_update)
{
struct parsed_op *po;
int first_pop = -1;
- *adj = *multipath = 0;
+ *adj = *is_multipath = 0;
- for (; i < opcnt; i++) {
- po = &ops[i];
+ for (; i < opcnt && *adj < adj_expect; i++) {
+ if (g_labels[i] != NULL)
+ *is_multipath = 1;
- if (g_labels[i][0] != 0)
- *multipath = 1;
+ po = &ops[i];
+ if (po->flags & OPF_DONE)
+ continue;
if (po->op == OP_ADD && po->operand[0].reg == xSP) {
if (po->operand[1].type != OPT_CONST)
*adj += po->operand[1].val;
if (*adj & 3)
ferr(&ops[i], "unaligned esp adjust: %x\n", *adj);
+ if (do_update) {
+ if (!*is_multipath)
+ patch_esp_adjust(po, adj_expect);
+ else
+ po->flags |= OPF_RMD;
+ }
return i;
}
- else if (po->op == OP_PUSH && !(po->flags & OPF_RMD)) {
+ else if (po->op == OP_PUSH) {
//if (first_pop == -1)
// first_pop = -2; // none
*adj -= lmod_bytes(po, po->operand[0].lmod);
}
- else if (po->op == OP_POP && !(po->flags & OPF_RMD)) {
- // seems like msvc only uses 'pop ecx' for stack realignment..
- if (po->operand[0].type != OPT_REG || po->operand[0].reg != xCX)
- break;
- if (first_pop == -1 && *adj >= 0)
- first_pop = i;
+ else if (po->op == OP_POP) {
+ if (!(po->flags & OPF_DONE)) {
+ // seems like msvc only uses 'pop ecx' for stack realignment..
+ if (po->operand[0].type != OPT_REG || po->operand[0].reg != xCX)
+ break;
+ if (first_pop == -1 && *adj >= 0)
+ first_pop = i;
+ }
+ if (do_update && *adj >= 0) {
+ po->flags |= OPF_RMD;
+ if (!*is_multipath)
+ po->flags |= OPF_DONE;
+ }
+
*adj += lmod_bytes(po, po->operand[0].lmod);
}
else if (po->flags & (OPF_JMP|OPF_TAIL)) {
if (po->op == OP_JMP && po->btj == NULL) {
+ if (po->bt_i <= i)
+ break;
i = po->bt_i - 1;
continue;
}
break;
if (po->pp != NULL && po->pp->is_stdcall)
break;
+ // assume it's another cdecl call
}
}
int stack_ra = 0;
int offset = 0;
+ if (g_header_mode)
+ return NULL;
+
parse_stack_access(po, opr->name, ofs_reg,
&offset, &stack_ra, NULL, 0);
if (ofs_reg[0] != 0)
pp = proto_parse(g_fhdr, buf, g_quiet_pp);
}
else if (opr->type == OPT_OFFSET || opr->type == OPT_LABEL) {
- pp = proto_parse(g_fhdr, opr->name, 0);
- if (pp == NULL)
- ferr(po, "proto_parse failed for icall from '%s'\n", opr->name);
- check_func_pp(po, pp, "reg-fptr ref");
+ pp = proto_parse(g_fhdr, opr->name, g_quiet_pp);
+ if (pp == NULL) {
+ if (!g_header_mode)
+ ferr(po, "proto_parse failed for icall to '%s'\n", opr->name);
+ }
+ else
+ check_func_pp(po, pp, "reg-fptr ref");
}
return pp;
ops[i].cc_scratch = magic;
while (1) {
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
lr = &g_label_refs[i];
for (; lr != NULL; lr = lr->next) {
check_i(&ops[i], lr->i);
*pp_found = pp;
}
+// early check for tail call or branch back
+static int is_like_tailjmp(int j)
+{
+ if (!(ops[j].flags & OPF_JMP))
+ return 0;
+
+ if (ops[j].op == OP_JMP && !ops[j].operand[0].had_ds)
+ // probably local branch back..
+ return 1;
+ if (ops[j].op == OP_CALL)
+ // probably noreturn call..
+ return 1;
+
+ return 0;
+}
+
+static void scan_prologue_epilogue(int opcnt)
+{
+ int ecx_push = 0, esp_sub = 0;
+ int found;
+ int i, j, l;
+
+ 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")
+ && IS(opr_name(&ops[1], 1), "esp"))
+ {
+ g_bp_frame = 1;
+ ops[0].flags |= OPF_RMD | OPF_DONE;
+ ops[1].flags |= OPF_RMD | OPF_DONE;
+ i = 2;
+
+ if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) {
+ g_stack_fsz = opr_const(&ops[2], 1);
+ ops[2].flags |= OPF_RMD | OPF_DONE;
+ i++;
+ }
+ else {
+ // another way msvc builds stack frame..
+ i = 2;
+ while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
+ g_stack_fsz += 4;
+ ops[i].flags |= OPF_RMD | OPF_DONE;
+ 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 | OPF_DONE;
+ i++;
+ ops[i].flags |= OPF_RMD | OPF_DONE;
+ i++;
+ }
+ }
+
+ found = 0;
+ do {
+ for (; i < opcnt; i++)
+ if (ops[i].op == OP_RET)
+ break;
+ j = i - 1;
+ if (i == opcnt && (ops[j].flags & OPF_JMP)) {
+ if (found && is_like_tailjmp(j))
+ break;
+ j--;
+ }
+
+ if ((ops[j].op == OP_POP && IS(opr_name(&ops[j], 0), "ebp"))
+ || ops[j].op == OP_LEAVE)
+ {
+ ops[j].flags |= OPF_RMD | OPF_DONE;
+ }
+ else if (!(g_ida_func_attr & IDAFA_NORETURN))
+ ferr(&ops[j], "'pop ebp' expected\n");
+
+ if (g_stack_fsz != 0) {
+ if (ops[j - 1].op == OP_MOV
+ && IS(opr_name(&ops[j - 1], 0), "esp")
+ && IS(opr_name(&ops[j - 1], 1), "ebp"))
+ {
+ ops[j - 1].flags |= OPF_RMD | OPF_DONE;
+ }
+ else if (ops[j].op != OP_LEAVE
+ && !(g_ida_func_attr & IDAFA_NORETURN))
+ {
+ ferr(&ops[j - 1], "esp restore expected\n");
+ }
+
+ if (ecx_push && ops[j - 2].op == OP_POP
+ && IS(opr_name(&ops[j - 2], 0), "ecx"))
+ {
+ ferr(&ops[j - 2], "unexpected ecx pop\n");
+ }
+ }
+
+ found = 1;
+ i++;
+ } while (i < opcnt);
+
+ return;
+ }
+
+ // non-bp frame
+ i = 0;
+ while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
+ ops[i].flags |= OPF_RMD | OPF_DONE;
+ g_stack_fsz += 4;
+ ecx_push++;
+ i++;
+ }
+
+ for (; 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_stack_fsz = ops[i].operand[1].val;
+ ops[i].flags |= OPF_RMD | OPF_DONE;
+ esp_sub = 1;
+ break;
+ }
+ }
+
+ if (ecx_push && !esp_sub) {
+ // could actually be args for a call..
+ for (; i < opcnt; i++)
+ if (ops[i].op != OP_PUSH)
+ break;
+
+ if (ops[i].op == OP_CALL && ops[i].operand[0].type == OPT_LABEL) {
+ const struct parsed_proto *pp;
+ pp = proto_parse(g_fhdr, opr_name(&ops[i], 0), 1);
+ j = pp ? pp->argc_stack : 0;
+ while (i > 0 && j > 0) {
+ i--;
+ if (ops[i].op == OP_PUSH) {
+ ops[i].flags &= ~(OPF_RMD | OPF_DONE);
+ j--;
+ }
+ }
+ if (j != 0)
+ ferr(&ops[i], "unhandled prologue\n");
+
+ // recheck
+ i = g_stack_fsz = ecx_push = 0;
+ while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
+ if (!(ops[i].flags & OPF_RMD))
+ break;
+ g_stack_fsz += 4;
+ ecx_push++;
+ i++;
+ }
+ }
+ }
+
+ found = 0;
+ if (ecx_push || esp_sub)
+ {
+ g_sp_frame = 1;
+
+ i++;
+ do {
+ for (; i < opcnt; i++)
+ if (ops[i].op == OP_RET)
+ break;
+ j = i - 1;
+ if (i == opcnt && (ops[j].flags & OPF_JMP)) {
+ if (found && is_like_tailjmp(j))
+ break;
+ j--;
+ }
+
+ if (ecx_push > 0) {
+ for (l = 0; l < ecx_push; l++) {
+ if (ops[j].op == OP_POP && IS(opr_name(&ops[j], 0), "ecx"))
+ /* pop ecx */;
+ else if (ops[j].op == OP_ADD
+ && IS(opr_name(&ops[j], 0), "esp")
+ && ops[j].operand[1].type == OPT_CONST)
+ {
+ /* add esp, N */
+ l += ops[j].operand[1].val / 4 - 1;
+ }
+ else
+ ferr(&ops[j], "'pop ecx' expected\n");
+
+ ops[j].flags |= OPF_RMD | OPF_DONE;
+ j--;
+ }
+ if (l != ecx_push)
+ ferr(&ops[j], "epilogue scan failed\n");
+
+ found = 1;
+ }
+
+ if (esp_sub) {
+ if (ops[j].op != OP_ADD
+ || !IS(opr_name(&ops[j], 0), "esp")
+ || ops[j].operand[1].type != OPT_CONST
+ || ops[j].operand[1].val != g_stack_fsz)
+ ferr(&ops[j], "'add esp' expected\n");
+
+ ops[j].flags |= OPF_RMD | OPF_DONE;
+ ops[j].operand[1].val = 0; // hack for stack arg scanner
+ found = 1;
+ }
+
+ i++;
+ } while (i < opcnt);
+ }
+}
+
static const struct parsed_proto *resolve_icall(int i, int opcnt,
int *multi_src)
{
ops[i].cc_scratch = magic;
while (1) {
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
lr = &g_label_refs[i];
for (; lr != NULL; lr = lr->next) {
check_i(&ops[i], lr->i);
return -1;
}
-static int collect_call_args_r(struct parsed_op *po, int i,
- struct parsed_proto *pp, int *regmask, int *save_arg_vars, int arg,
- int magic, int need_op_saving, int may_reuse)
+static struct parsed_proto *process_call_early(int i, int opcnt,
+ int *adj_i)
{
- struct parsed_proto *pp_tmp;
- struct label_ref *lr;
- int need_to_save_current;
- int save_args;
- int ret = 0;
- int reg;
- char buf[32];
- int j, k;
+ struct parsed_op *po = &ops[i];
+ struct parsed_proto *pp;
+ int multipath = 0;
+ int adj = 0;
+ int ret;
- if (i < 0) {
- ferr(po, "dead label encountered\n");
- return -1;
+ pp = po->pp;
+ if (pp == NULL || pp->is_vararg || pp->argc_reg != 0)
+ // leave for later
+ return NULL;
+
+ // look for and make use of esp adjust
+ *adj_i = ret = -1;
+ if (!pp->is_stdcall && pp->argc_stack > 0)
+ ret = scan_for_esp_adjust(i + 1, opcnt,
+ pp->argc_stack * 4, &adj, &multipath, 0);
+ if (ret >= 0) {
+ if (pp->argc_stack > adj / 4)
+ return NULL;
+ if (multipath)
+ return NULL;
+ if (ops[ret].op == OP_POP && adj != 4)
+ return NULL;
}
- for (; arg < pp->argc; arg++)
- if (pp->arg[arg].reg == NULL)
- break;
- magic = (magic & 0xffffff) | (arg << 24);
+ *adj_i = ret;
+ return pp;
+}
- for (j = i; j >= 0 && (arg < pp->argc || pp->is_unresolved); )
+static struct parsed_proto *process_call(int i, int opcnt)
+{
+ struct parsed_op *po = &ops[i];
+ const struct parsed_proto *pp_c;
+ struct parsed_proto *pp;
+ const char *tmpname;
+ int adj = 0, multipath = 0;
+ int ret, arg;
+
+ tmpname = opr_name(po, 0);
+ pp = po->pp;
+ if (pp == NULL)
{
- 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;
+ // indirect call
+ pp_c = resolve_icall(i, opcnt, &multipath);
+ if (pp_c != NULL) {
+ if (!pp_c->is_func && !pp_c->is_fptr)
+ ferr(po, "call to non-func: %s\n", pp_c->name);
+ pp = proto_clone(pp_c);
+ my_assert_not(pp, NULL);
+ if (multipath)
+ // not resolved just to single func
+ pp->is_fptr = 1;
+
+ switch (po->operand[0].type) {
+ case OPT_REG:
+ // we resolved this call and no longer need the register
+ po->regmask_src &= ~(1 << po->operand[0].reg);
+ break;
+ case OPT_REGMEM:
+ pp->is_fptr = 1;
+ break;
+ default:
+ break;
}
- // ok: have already been here
- return 0;
}
- ops[j].cc_scratch = magic;
+ if (pp == NULL) {
+ pp = calloc(1, sizeof(*pp));
+ my_assert_not(pp, NULL);
+
+ pp->is_fptr = 1;
+ ret = scan_for_esp_adjust(i + 1, opcnt,
+ 32*4, &adj, &multipath, 0);
+ if (ret < 0 || adj < 0) {
+ if (!g_allow_regfunc)
+ ferr(po, "non-__cdecl indirect call unhandled yet\n");
+ pp->is_unresolved = 1;
+ adj = 0;
+ }
+ adj /= 4;
+ if (adj > ARRAY_SIZE(pp->arg))
+ ferr(po, "esp adjust too large: %d\n", adj);
+ pp->ret_type.name = strdup("int");
+ pp->argc = pp->argc_stack = adj;
+ for (arg = 0; arg < pp->argc; arg++)
+ pp->arg[arg].type.name = strdup("int");
+ }
+ po->pp = pp;
+ }
+
+ // look for and make use of esp adjust
+ multipath = 0;
+ ret = -1;
+ if (!pp->is_stdcall && pp->argc_stack > 0)
+ ret = scan_for_esp_adjust(i + 1, opcnt,
+ pp->argc_stack * 4, &adj, &multipath, 0);
+ if (ret >= 0) {
+ if (pp->is_vararg) {
+ if (adj / 4 < pp->argc_stack) {
+ fnote(po, "(this call)\n");
+ ferr(&ops[ret], "esp adjust is too small: %x < %x\n",
+ adj, pp->argc_stack * 4);
+ }
+ // modify pp to make it have varargs as normal args
+ arg = pp->argc;
+ pp->argc += adj / 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);
+ }
+ if (pp->argc_stack > adj / 4) {
+ fnote(po, "(this call)\n");
+ ferr(&ops[ret], "stack tracking failed for '%s': %x %x\n",
+ tmpname, pp->argc_stack * 4, adj);
+ }
- if (g_labels[j][0] != 0 && g_label_refs[j].i != -1) {
- lr = &g_label_refs[j];
- if (lr->next != NULL)
- need_op_saving = 1;
- for (; lr->next; lr = lr->next) {
+ scan_for_esp_adjust(i + 1, opcnt,
+ pp->argc_stack * 4, &adj, &multipath, 1);
+ }
+ else if (pp->is_vararg)
+ ferr(po, "missing esp_adjust for vararg func '%s'\n",
+ pp->name);
+
+ return pp;
+}
+
+static int collect_call_args_early(struct parsed_op *po, int i,
+ struct parsed_proto *pp, int *regmask)
+{
+ int arg, ret;
+ int j;
+
+ for (arg = 0; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+
+ // first see if it can be easily done
+ for (j = i; j > 0 && arg < pp->argc; )
+ {
+ if (g_labels[j] != NULL)
+ return -1;
+ j--;
+
+ if (ops[j].op == OP_CALL)
+ return -1;
+ else if (ops[j].op == OP_ADD && ops[j].operand[0].reg == xSP)
+ return -1;
+ else if (ops[j].op == OP_POP)
+ return -1;
+ else if (ops[j].flags & OPF_CJMP)
+ return -1;
+ else if (ops[j].op == OP_PUSH) {
+ if (ops[j].flags & (OPF_FARG|OPF_FARGNR))
+ return -1;
+ ret = scan_for_mod(&ops[j], j + 1, i, 1);
+ if (ret >= 0)
+ return -1;
+
+ if (pp->arg[arg].type.is_va_list)
+ return -1;
+
+ // next arg
+ for (arg++; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+ }
+ }
+
+ if (arg < pp->argc)
+ return -1;
+
+ // now do it
+ for (arg = 0; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+
+ for (j = i; j > 0 && arg < pp->argc; )
+ {
+ j--;
+
+ if (ops[j].op == OP_PUSH)
+ {
+ ops[j].p_argnext = -1;
+ ferr_assert(&ops[j], pp->arg[arg].datap == NULL);
+ pp->arg[arg].datap = &ops[j];
+
+ if (ops[j].operand[0].type == OPT_REG)
+ *regmask |= 1 << ops[j].operand[0].reg;
+
+ ops[j].flags |= OPF_RMD | OPF_DONE | OPF_FARGNR | OPF_FARG;
+ ops[j].flags &= ~OPF_RSAVE;
+
+ // next arg
+ for (arg++; arg < pp->argc; arg++)
+ if (pp->arg[arg].reg == NULL)
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int collect_call_args_r(struct parsed_op *po, int i,
+ struct parsed_proto *pp, int *regmask, int *save_arg_vars,
+ int *arg_grp, int arg, int magic, int need_op_saving, int may_reuse)
+{
+ struct parsed_proto *pp_tmp;
+ struct parsed_op *po_tmp;
+ struct label_ref *lr;
+ int need_to_save_current;
+ int arg_grp_current = 0;
+ int save_args_seen = 0;
+ int save_args;
+ int ret = 0;
+ int reg;
+ char buf[32];
+ int j, k;
+
+ if (i < 0) {
+ ferr(po, "dead label encountered\n");
+ 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 || pp->is_unresolved); )
+ {
+ 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] != NULL && g_label_refs[j].i != -1) {
+ lr = &g_label_refs[j];
+ if (lr->next != NULL)
+ need_op_saving = 1;
+ for (; lr->next; lr = lr->next) {
check_i(&ops[j], lr->i);
if ((ops[lr->i].flags & (OPF_JMP|OPF_CJMP)) != OPF_JMP)
may_reuse = 1;
ret = collect_call_args_r(po, lr->i, pp, regmask, save_arg_vars,
- arg, magic, need_op_saving, may_reuse);
+ arg_grp, arg, magic, need_op_saving, may_reuse);
if (ret < 0)
return ret;
}
}
need_op_saving = 1;
ret = collect_call_args_r(po, lr->i, pp, regmask, save_arg_vars,
- arg, magic, need_op_saving, may_reuse);
+ arg_grp, arg, magic, need_op_saving, may_reuse);
if (ret < 0)
return ret;
}
ferr(po, "arg collect %d/%d hit esp adjust of %d\n",
arg, pp->argc, ops[j].operand[1].val);
}
- else if (ops[j].op == OP_POP) {
+ else if (ops[j].op == OP_POP && !(ops[j].flags & OPF_DONE))
+ {
if (pp->is_unresolved)
break;
may_reuse = 1;
}
- else if (ops[j].op == OP_PUSH && !(ops[j].flags & OPF_FARG))
+ else if (ops[j].op == OP_PUSH
+ && !(ops[j].flags & (OPF_FARGNR|OPF_DONE)))
{
if (pp->is_unresolved && (ops[j].flags & OPF_RMD))
break;
+ ops[j].p_argnext = -1;
+ po_tmp = pp->arg[arg].datap;
+ if (po_tmp != NULL)
+ ops[j].p_argnext = po_tmp - ops;
pp->arg[arg].datap = &ops[j];
+
need_to_save_current = 0;
save_args = 0;
reg = -1;
ops[j].p_argnum = arg + 1;
save_args |= 1 << arg;
}
+
+ if (save_args_seen & (1 << (ops[j].p_argnum - 1))) {
+ save_args_seen = 0;
+ arg_grp_current++;
+ if (arg_grp_current >= MAX_ARG_GRP)
+ ferr(&ops[j], "out of arg groups (arg%d), f %s\n",
+ ops[j].p_argnum, pp->name);
+ }
}
else if (ops[j].p_argnum == 0)
ops[j].flags |= OPF_RMD;
// 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;
+ ops[j].flags |= OPF_FARGNR;
+ ops[j].flags |= OPF_FARG;
ops[j].flags &= ~OPF_RSAVE;
// check for __VALIST
if (!g_func_pp->is_vararg
|| strstr(ops[k].operand[1].name, buf))
{
- ops[k].flags |= OPF_RMD;
+ ops[k].flags |= OPF_RMD | OPF_DONE;
ops[j].flags |= OPF_RMD | OPF_VAPUSH;
save_args &= ~(1 << arg);
reg = -1;
ret = stack_frame_access(&ops[k], &ops[k].operand[1],
buf, sizeof(buf), ops[k].operand[1].name, "", 1, 0);
if (ret >= 0) {
- ops[k].flags |= OPF_RMD;
+ ops[k].flags |= OPF_RMD | OPF_DONE;
ops[j].flags |= OPF_RMD;
ops[j].p_argpass = ret + 1;
save_args &= ~(1 << arg);
}
magic = (magic & 0xffffff) | (arg << 24);
}
+
+ if (ops[j].p_arggrp > arg_grp_current) {
+ save_args_seen = 0;
+ arg_grp_current = ops[j].p_arggrp;
+ }
+ if (ops[j].p_argnum > 0)
+ save_args_seen |= 1 << (ops[j].p_argnum - 1);
}
if (arg < pp->argc) {
return -1;
}
+ if (arg_grp_current > *arg_grp)
+ *arg_grp = arg_grp_current;
+
return arg;
}
struct parsed_proto *pp, int *regmask, int *save_arg_vars,
int magic)
{
+ // arg group is for cases when pushes for
+ // multiple funcs are going on
+ struct parsed_op *po_tmp;
+ int save_arg_vars_current = 0;
+ int arg_grp = 0;
int ret;
int a;
- ret = collect_call_args_r(po, i, pp, regmask, save_arg_vars,
- 0, magic, 0, 0);
+ ret = collect_call_args_r(po, i, pp, regmask,
+ &save_arg_vars_current, &arg_grp, 0, magic, 0, 0);
if (ret < 0)
return ret;
+ if (arg_grp != 0) {
+ // propagate arg_grp
+ for (a = 0; a < pp->argc; a++) {
+ if (pp->arg[a].reg != NULL)
+ continue;
+
+ po_tmp = pp->arg[a].datap;
+ while (po_tmp != NULL) {
+ po_tmp->p_arggrp = arg_grp;
+ if (po_tmp->p_argnext > 0)
+ po_tmp = &ops[po_tmp->p_argnext];
+ else
+ po_tmp = NULL;
+ }
+ }
+ }
+ save_arg_vars[arg_grp] |= save_arg_vars_current;
+
if (pp->is_unresolved) {
pp->argc += ret;
pp->argc_stack += ret;
return ret;
}
-// early check for tail call or branch back
-static int is_like_tailjmp(int j)
-{
- if (!(ops[j].flags & OPF_JMP))
- return 0;
-
- if (ops[j].op == OP_JMP && !ops[j].operand[0].had_ds)
- // probably local branch back..
- return 1;
- if (ops[j].op == OP_CALL)
- // probably noreturn call..
- return 1;
-
- return 0;
-}
-
static void pp_insert_reg_arg(struct parsed_proto *pp, const char *reg)
{
int i;
// 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)) {
+ if (g_labels[l] != NULL && IS(g_labels[l], pd->d[j].u.label)) {
add_label_ref(&g_label_refs[l], i);
pd->d[j].bt_i = l;
break;
return pd;
}
+static void clear_labels(int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ if (g_labels[i] != NULL) {
+ free(g_labels[i]);
+ g_labels[i] = NULL;
+ }
+ }
+}
+
static void output_std_flags(FILE *fout, struct parsed_op *po,
int *pfomask, const char *dst_opr_text)
{
}
}
+enum {
+ OPP_FORCE_NORETURN = (1 << 0),
+ OPP_SIMPLE_ARGS = (1 << 1),
+ OPP_ALIGN = (1 << 2),
+};
+
static void output_pp_attrs(FILE *fout, const struct parsed_proto *pp,
- int is_noreturn)
+ int flags)
{
+ const char *cconv = "";
+
if (pp->is_fastcall)
- fprintf(fout, "__fastcall ");
+ cconv = "__fastcall ";
else if (pp->is_stdcall && pp->argc_reg == 0)
- fprintf(fout, "__stdcall ");
- if (pp->is_noreturn || is_noreturn)
+ cconv = "__stdcall ";
+
+ fprintf(fout, (flags & OPP_ALIGN) ? "%-16s" : "%s", cconv);
+
+ if (pp->is_noreturn || (flags & OPP_FORCE_NORETURN))
fprintf(fout, "noreturn ");
}
+static void output_pp(FILE *fout, const struct parsed_proto *pp,
+ int flags)
+{
+ int i;
+
+ fprintf(fout, (flags & OPP_ALIGN) ? "%-5s" : "%s ",
+ pp->ret_type.name);
+ if (pp->is_fptr)
+ fprintf(fout, "(");
+ output_pp_attrs(fout, pp, flags);
+ if (pp->is_fptr)
+ fprintf(fout, "*");
+ fprintf(fout, "%s", pp->name);
+ if (pp->is_fptr)
+ fprintf(fout, ")");
+
+ fprintf(fout, "(");
+ for (i = 0; i < pp->argc; i++) {
+ if (i > 0)
+ fprintf(fout, ", ");
+ if (pp->arg[i].fptr != NULL && !(flags & OPP_SIMPLE_ARGS)) {
+ // func pointer
+ output_pp(fout, pp->arg[i].fptr, 0);
+ }
+ else if (pp->arg[i].type.is_retreg) {
+ fprintf(fout, "u32 *r_%s", pp->arg[i].reg);
+ }
+ else {
+ fprintf(fout, "%s", pp->arg[i].type.name);
+ if (!pp->is_fptr)
+ fprintf(fout, " a%d", i + 1);
+ }
+ }
+ if (pp->is_vararg) {
+ if (i > 0)
+ fprintf(fout, ", ");
+ fprintf(fout, "...");
+ }
+ fprintf(fout, ")");
+}
+
+static int get_pp_arg_regmask(const struct parsed_proto *pp)
+{
+ int regmask = 0;
+ int i, reg;
+
+ for (i = 0; i < pp->argc; i++) {
+ if (pp->arg[i].reg != NULL) {
+ reg = char_array_i(regs_r32,
+ ARRAY_SIZE(regs_r32), pp->arg[i].reg);
+ if (reg < 0)
+ ferr(ops, "arg '%s' of func '%s' is not a reg?\n",
+ pp->arg[i].reg, pp->name);
+ regmask |= 1 << reg;
+ }
+ }
+
+ return regmask;
+}
+
+static char *saved_arg_name(char *buf, size_t buf_size, int grp, int num)
+{
+ char buf1[16];
+
+ buf1[0] = 0;
+ if (grp > 0)
+ snprintf(buf1, sizeof(buf1), "%d", grp);
+ snprintf(buf, buf_size, "s%s_a%d", buf1, num);
+
+ return buf;
+}
+
+static void gen_x_cleanup(int opcnt);
+
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_data *pd;
const char *tmpname;
unsigned int uval;
- int save_arg_vars = 0;
+ int save_arg_vars[MAX_ARG_GRP] = { 0, };
int cond_vars = 0;
int need_tmp_var = 0;
int need_tmp64 = 0;
int had_decl = 0;
int label_pending = 0;
- int regmask_save = 0;
- int regmask_arg = 0;
- int regmask_now = 0;
- int regmask_init = 0;
- int regmask = 0;
+ int regmask_save = 0; // regs saved/restored in this func
+ int regmask_arg = 0; // regs carrying function args (fastcall, etc)
+ int regmask_now; // temp
+ int regmask_init = 0; // regs that need zero initialization
+ int regmask_pp = 0; // regs used in complex push-pop graph
+ int regmask = 0; // used regs
int pfomask = 0;
int found = 0;
int depth = 0;
if (g_func_pp == NULL)
ferr(ops, "proto_parse failed for '%s'\n", funcn);
- 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);
- if (reg < 0)
- ferr(ops, "arg '%s' is not a reg?\n", g_func_pp->arg[i].reg);
- regmask_arg |= 1 << reg;
- }
- }
+ regmask_arg = get_pp_arg_regmask(g_func_pp);
// pass1:
// - 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")
- && IS(opr_name(&ops[1], 1), "esp"))
- {
- int ecx_push = 0;
-
- 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_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_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++;
- }
- }
-
- found = 0;
- do {
- for (; i < opcnt; i++)
- if (ops[i].op == OP_RET)
- break;
- j = i - 1;
- if (i == opcnt && (ops[j].flags & OPF_JMP)) {
- if (found && is_like_tailjmp(j))
- break;
- j--;
- }
-
- if ((ops[j].op == OP_POP && IS(opr_name(&ops[j], 0), "ebp"))
- || ops[j].op == OP_LEAVE)
- {
- ops[j].flags |= OPF_RMD;
- }
- else if (!(g_ida_func_attr & IDAFA_NORETURN))
- ferr(&ops[j], "'pop ebp' expected\n");
-
- if (g_stack_fsz != 0) {
- if (ops[j - 1].op == OP_MOV
- && IS(opr_name(&ops[j - 1], 0), "esp")
- && IS(opr_name(&ops[j - 1], 1), "ebp"))
- {
- ops[j - 1].flags |= OPF_RMD;
- }
- else if (ops[j].op != OP_LEAVE
- && !(g_ida_func_attr & IDAFA_NORETURN))
- {
- ferr(&ops[j - 1], "esp restore expected\n");
- }
-
- if (ecx_push && ops[j - 2].op == OP_POP
- && IS(opr_name(&ops[j - 2], 0), "ecx"))
- {
- ferr(&ops[j - 2], "unexpected ecx pop\n");
- }
- }
-
- found = 1;
- i++;
- } while (i < opcnt);
- }
- else {
- int ecx_push = 0, esp_sub = 0;
-
- i = 0;
- while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) {
- ops[i].flags |= OPF_RMD;
- g_stack_fsz += 4;
- ecx_push++;
- i++;
- }
-
- for (; 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_stack_fsz = ops[i].operand[1].val;
- ops[i].flags |= OPF_RMD;
- esp_sub = 1;
- break;
- }
- }
-
- found = 0;
- if (ecx_push || esp_sub)
- {
- g_sp_frame = 1;
-
- i++;
- do {
- for (; i < opcnt; i++)
- if (ops[i].op == OP_RET)
- break;
- j = i - 1;
- if (i == opcnt && (ops[j].flags & OPF_JMP)) {
- if (found && is_like_tailjmp(j))
- break;
- j--;
- }
-
- if (ecx_push > 0) {
- for (l = 0; l < ecx_push; l++) {
- if (ops[j].op != OP_POP
- || !IS(opr_name(&ops[j], 0), "ecx"))
- {
- ferr(&ops[j], "'pop ecx' expected\n");
- }
- ops[j].flags |= OPF_RMD;
- j--;
- }
-
- found = 1;
- }
-
- if (esp_sub) {
- if (ops[j].op != OP_ADD
- || !IS(opr_name(&ops[j], 0), "esp")
- || ops[j].operand[1].type != OPT_CONST
- || ops[j].operand[1].val != g_stack_fsz)
- ferr(&ops[j], "'add esp' expected\n");
- ops[j].flags |= OPF_RMD;
-
- found = 1;
- }
-
- i++;
- } while (i < opcnt);
- }
- }
+ scan_prologue_epilogue(opcnt);
// pass2:
// - parse calls with labels
po->bt_i = -1;
po->btj = NULL;
- if (po->flags & OPF_RMD)
+ if (po->flags & (OPF_RMD|OPF_DONE))
continue;
if (po->op == OP_CALL) {
}
for (l = 0; l < opcnt; l++) {
- if (g_labels[l][0] && IS(po->operand[0].name, g_labels[l])) {
+ if (g_labels[l] != NULL
+ && IS(po->operand[0].name, g_labels[l]))
+ {
if (l == i + 1 && po->op == OP_JMP) {
// yet another alignment type..
- po->flags |= OPF_RMD;
+ po->flags |= OPF_RMD|OPF_DONE;
break;
}
add_label_ref(&g_label_refs[l], i);
// pass3:
// - remove dead labels
- // - process calls
+ // - process trivial calls
for (i = 0; i < opcnt; i++)
{
- if (g_labels[i][0] != 0 && g_label_refs[i].i == -1)
- g_labels[i][0] = 0;
+ if (g_labels[i] != NULL && g_label_refs[i].i == -1) {
+ free(g_labels[i]);
+ g_labels[i] = NULL;
+ }
po = &ops[i];
- if (po->flags & OPF_RMD)
+ if (po->flags & (OPF_RMD|OPF_DONE))
continue;
if (po->op == OP_CALL)
{
- tmpname = opr_name(po, 0);
- pp = po->pp;
- if (pp == NULL)
- {
- // indirect call
- pp_c = resolve_icall(i, opcnt, &l);
- if (pp_c != NULL) {
- if (!pp_c->is_func && !pp_c->is_fptr)
- ferr(po, "call to non-func: %s\n", pp_c->name);
- pp = proto_clone(pp_c);
- my_assert_not(pp, NULL);
- if (l)
- // not resolved just to single func
- pp->is_fptr = 1;
-
- switch (po->operand[0].type) {
- case OPT_REG:
- // we resolved this call and no longer need the register
- po->regmask_src &= ~(1 << po->operand[0].reg);
- break;
- case OPT_REGMEM:
- pp->is_fptr = 1;
- break;
- default:
- break;
- }
- }
- if (pp == NULL) {
- pp = calloc(1, sizeof(*pp));
- my_assert_not(pp, NULL);
- pp->is_fptr = 1;
- ret = scan_for_esp_adjust(i + 1, opcnt, &j, &l);
- if (ret < 0) {
- if (!g_allow_regfunc)
- ferr(po, "non-__cdecl indirect call unhandled yet\n");
- pp->is_unresolved = 1;
- j = 0;
- }
- j /= 4;
- if (j > ARRAY_SIZE(pp->arg))
- ferr(po, "esp adjust too large: %d\n", j);
- 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");
- }
- po->pp = pp;
- }
-
- // 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, &l);
- 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);
- }
- 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;
- if (ops[ret].op == OP_POP && j > 4) {
- // deal with multi-pop stack adjust
- j = pp->argc_stack;
- while (ops[ret].op == OP_POP && j > 0 && ret < opcnt) {
- ops[ret].flags |= OPF_RMD;
- j--;
- ret++;
- }
- }
- else if (!l) {
- // a bit of a hack, but deals with use of
- // single adj for multiple calls
- ops[ret].operand[1].val -= j;
+ pp = process_call_early(i, opcnt, &j);
+ if (pp != NULL) {
+ if (!(po->flags & OPF_ATAIL))
+ // since we know the args, try to collect them
+ if (collect_call_args_early(po, i, pp, ®mask) != 0)
+ pp = NULL;
+ }
+
+ if (pp != NULL) {
+ if (j >= 0) {
+ // commit esp adjust
+ ops[j].flags |= OPF_RMD;
+ if (ops[j].op != OP_POP)
+ patch_esp_adjust(&ops[j], pp->argc_stack * 4);
+ else
+ ops[j].flags |= OPF_DONE;
}
+
+ if (strstr(pp->ret_type.name, "int64"))
+ need_tmp64 = 1;
+
+ po->flags |= OPF_DONE;
}
- else if (pp->is_vararg)
- ferr(po, "missing esp_adjust for vararg func '%s'\n",
- pp->name);
+ }
+ }
+
+ // pass4:
+ // - process calls
+ // - handle push <const>/pop pairs
+ for (i = 0; i < opcnt; i++)
+ {
+ po = &ops[i];
+ if (po->flags & (OPF_RMD|OPF_DONE))
+ continue;
+
+ if (po->op == OP_CALL && !(po->flags & OPF_DONE))
+ {
+ pp = process_call(i, opcnt);
if (!pp->is_unresolved && !(po->flags & OPF_ATAIL)) {
// since we know the args, collect them
- collect_call_args(po, i, pp, ®mask, &save_arg_vars,
+ collect_call_args(po, i, pp, ®mask, save_arg_vars,
i + opcnt * 2);
}
if (strstr(pp->ret_type.name, "int64"))
need_tmp64 = 1;
}
+ else if (po->op == OP_PUSH && !(po->flags & OPF_FARG)
+ && !(po->flags & OPF_RSAVE) && po->operand[0].type == OPT_CONST)
+ scan_for_pop_const(i, opcnt, ®mask_pp);
}
- // pass4:
+ // pass5:
// - find POPs for PUSHes, rm both
// - scan for STD/CLD, propagate DF
// - scan for all used registers
// - find flag set ops for their users
// - do unreselved calls
// - declare indirect functions
- for (i = 0; i < opcnt; i++) {
+ for (i = 0; i < opcnt; i++)
+ {
po = &ops[i];
- if (po->flags & OPF_RMD)
+ if (po->flags & (OPF_RMD|OPF_DONE))
continue;
if (po->op == OP_PUSH && (po->flags & OPF_RSAVE)) {
regmask_save |= 1 << reg;
}
- if (po->op == OP_PUSH && po->p_argnum == 0
+ if (po->op == OP_PUSH && !(po->flags & OPF_FARG)
&& !(po->flags & OPF_RSAVE) && !g_func_pp->is_userstack)
{
if (po->operand[0].type == OPT_REG)
continue;
}
}
- else if (po->operand[0].type == OPT_CONST) {
- for (j = i + 1; j < opcnt; j++) {
- if ((ops[j].flags & (OPF_JMP|OPF_TAIL|OPF_RSAVE))
- || ops[j].op == OP_PUSH || g_labels[i][0] != 0)
- {
- break;
- }
-
- if (!(ops[j].flags & OPF_RMD) && ops[j].op == OP_POP)
- {
- po->flags |= OPF_RMD;
- ops[j].datap = po;
- break;
- }
- }
- }
}
if (po->op == OP_STD) {
- po->flags |= OPF_DF | OPF_RMD;
+ po->flags |= OPF_DF | OPF_RMD | OPF_DONE;
scan_propagate_df(i + 1, opcnt);
}
need_tmp64 = 1;
}
else if (po->op == OP_CALL) {
+ // note: resolved non-reg calls are OPF_DONE already
pp = po->pp;
if (pp == NULL)
ferr(po, "NULL pp\n");
if (pp->is_unresolved) {
int regmask_stack = 0;
- collect_call_args(po, i, pp, ®mask, &save_arg_vars,
+ collect_call_args(po, i, pp, ®mask, save_arg_vars,
i + opcnt * 2);
// this is pretty rough guess:
need_tmp64 = 1;
}
else if (po->op == OP_CLD)
- po->flags |= OPF_RMD;
+ po->flags |= OPF_RMD | OPF_DONE;
if (po->op == OP_RCL || po->op == OP_RCR || po->op == OP_XCHG) {
need_tmp_var = 1;
}
}
- // pass4:
+ // pass6:
// - confirm regmask_save, it might have been reduced
if (regmask_save != 0)
{
}
// the function itself
- fprintf(fout, "%s ", g_func_pp->ret_type.name);
- output_pp_attrs(fout, g_func_pp, g_ida_func_attr & IDAFA_NORETURN);
- fprintf(fout, "%s(", g_func_pp->name);
-
- for (i = 0; i < g_func_pp->argc; i++) {
- if (i > 0)
- fprintf(fout, ", ");
- if (g_func_pp->arg[i].fptr != NULL) {
- // func pointer..
- pp = g_func_pp->arg[i].fptr;
- fprintf(fout, "%s (", pp->ret_type.name);
- output_pp_attrs(fout, pp, 0);
- 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);
- }
- if (pp->is_vararg) {
- if (j > 0)
- fprintf(fout, ", ");
- fprintf(fout, "...");
- }
- fprintf(fout, ")");
- }
- else if (g_func_pp->arg[i].type.is_retreg) {
- fprintf(fout, "u32 *r_%s", g_func_pp->arg[i].reg);
- }
- 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");
+ ferr_assert(ops, !g_func_pp->is_fptr);
+ output_pp(fout, g_func_pp,
+ (g_ida_func_attr & IDAFA_NORETURN) ? OPP_FORCE_NORETURN : 0);
+ fprintf(fout, "\n{\n");
// declare indirect functions
for (i = 0; i < opcnt; i++) {
else
snprintf(pp->name, sizeof(pp->name), "icall%d", i);
- fprintf(fout, " %s (", pp->ret_type.name);
- output_pp_attrs(fout, pp, 0);
- fprintf(fout, "*%s)(", pp->name);
- 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");
+ fprintf(fout, " ");
+ output_pp(fout, pp, OPP_SIMPLE_ARGS);
+ fprintf(fout, ";\n");
}
}
}
}
}
+ // declare normal registers
regmask_now = regmask & ~regmask_arg;
regmask_now &= ~(1 << xSP);
if (regmask_now & 0x00ff) {
}
}
- if (save_arg_vars) {
+ for (i = 0; i < ARRAY_SIZE(save_arg_vars); i++) {
+ if (save_arg_vars[i] == 0)
+ continue;
for (reg = 0; reg < 32; reg++) {
- if (save_arg_vars & (1 << reg)) {
- fprintf(fout, " u32 s_a%d;\n", reg + 1);
+ if (save_arg_vars[i] & (1 << reg)) {
+ fprintf(fout, " u32 %s;\n",
+ saved_arg_name(buf1, sizeof(buf1), i, reg + 1));
+ had_decl = 1;
+ }
+ }
+ }
+
+ // declare push-pop temporaries
+ if (regmask_pp) {
+ for (reg = 0; reg < 8; reg++) {
+ if (regmask_pp & (1 << reg)) {
+ fprintf(fout, " u32 pp_%s;\n", regs_r32[reg]);
had_decl = 1;
}
}
// output ops
for (i = 0; i < opcnt; i++)
{
- if (g_labels[i][0] != 0) {
+ if (g_labels[i] != NULL) {
fprintf(fout, "\n%s:\n", g_labels[i]);
label_pending = 1;
fprintf(fout, "a%d", tmp_op->p_argpass);
}
else if (tmp_op->p_argnum != 0) {
- fprintf(fout, "%ss_a%d", cast, tmp_op->p_argnum);
+ fprintf(fout, "%s%s", cast,
+ saved_arg_name(buf1, sizeof(buf1),
+ tmp_op->p_arggrp, tmp_op->p_argnum));
}
else {
fprintf(fout, "%s",
out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
if (po->p_argnum != 0) {
// special case - saved func arg
- fprintf(fout, " s_a%d = %s;", po->p_argnum, buf1);
+ fprintf(fout, " %s = %s;",
+ saved_arg_name(buf2, sizeof(buf2),
+ po->p_arggrp, po->p_argnum), buf1);
break;
}
else if (po->flags & OPF_RSAVE) {
fprintf(fout, " s_%s = %s;", buf1, buf1);
break;
}
+ else if (po->flags & OPF_PPUSH) {
+ tmp_op = po->datap;
+ ferr_assert(po, tmp_op != NULL);
+ out_dst_opr(buf2, sizeof(buf2), po, &tmp_op->operand[0]);
+ fprintf(fout, " pp_%s = %s;", buf2, buf1);
+ break;
+ }
else if (g_func_pp->is_userstack) {
fprintf(fout, " *(--esp) = %s;", buf1);
break;
break;
case OP_POP:
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
if (po->flags & OPF_RSAVE) {
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
fprintf(fout, " %s = s_%s;", buf1, buf1);
break;
}
+ else if (po->flags & OPF_PPUSH) {
+ // push/pop graph
+ ferr_assert(po, po->datap == NULL);
+ fprintf(fout, " %s = pp_%s;", buf1, buf1);
+ break;
+ }
else if (po->datap != NULL) {
// push/pop pair
tmp_op = po->datap;
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]);
fprintf(fout, " %s = %s;", buf1,
out_src_opr(buf2, sizeof(buf2),
tmp_op, &tmp_op->operand[0],
break;
}
else if (g_func_pp->is_userstack) {
- fprintf(fout, " %s = *esp++;",
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]));
+ fprintf(fout, " %s = *esp++;", buf1);
break;
}
else
fprintf(fout, "}\n\n");
- // cleanup
+ gen_x_cleanup(opcnt);
+}
+
+static void gen_x_cleanup(int opcnt)
+{
+ int i;
+
for (i = 0; i < opcnt; i++) {
struct label_ref *lr, *lr_del;
int id;
int argc_stack;
int regmask_dep;
- int has_ret:3; // -1, 0, 1: unresolved, no, yes
+ int has_ret:3; // -1, 0, 1: unresolved, no, yes
unsigned int dep_resolved:1;
unsigned int is_stdcall:1;
struct func_proto_dep *dep_func;
int dep_func_cnt;
+ const struct parsed_proto *pp; // seed pp, if any
};
struct func_proto_dep {
static struct func_prototype *hg_fp;
static int hg_fp_cnt;
+static struct scanned_var {
+ char name[NAMELEN];
+ enum opr_lenmod lmod;
+ unsigned int is_seeded:1;
+ unsigned int is_c_str:1;
+ const struct parsed_proto *pp; // seed pp, if any
+} *hg_vars;
+static int hg_var_cnt;
+
+static void output_hdr_fp(FILE *fout, const struct func_prototype *fp,
+ int count);
+
static struct func_proto_dep *hg_fp_find_dep(struct func_prototype *fp,
const char *name)
{
}
#endif
+// recursive register dep pass
+// - track saved regs (part 2)
+// - try to figure out arg-regs
+// - calculate reg deps
+static void gen_hdr_dep_pass(int i, int opcnt, unsigned char *cbits,
+ struct func_prototype *fp, int regmask_save, int regmask_dst,
+ int *regmask_dep, int *has_ret)
+{
+ struct func_proto_dep *dep;
+ struct parsed_op *po;
+ int from_caller = 0;
+ int depth;
+ int j, l;
+ int reg;
+ int ret;
+
+ for (; i < opcnt; i++)
+ {
+ if (cbits[i >> 3] & (1 << (i & 7)))
+ return;
+ cbits[i >> 3] |= (1 << (i & 7));
+
+ po = &ops[i];
+
+ if ((po->flags & OPF_JMP) && po->op != OP_CALL) {
+ if (po->btj != NULL) {
+ // jumptable
+ for (j = 0; j < po->btj->count; j++) {
+ gen_hdr_dep_pass(po->btj->d[j].bt_i, opcnt, cbits, fp,
+ regmask_save, regmask_dst, regmask_dep, has_ret);
+ }
+ return;
+ }
+
+ if (po->bt_i < 0) {
+ ferr(po, "dead branch\n");
+ return;
+ }
+
+ if (po->flags & OPF_CJMP) {
+ gen_hdr_dep_pass(po->bt_i, opcnt, cbits, fp,
+ regmask_save, regmask_dst, regmask_dep, has_ret);
+ }
+ else {
+ i = po->bt_i - 1;
+ }
+ continue;
+ }
+
+ if (po->flags & OPF_FARG)
+ /* (just calculate register deps) */;
+ else if (po->op == OP_PUSH && po->operand[0].type == OPT_REG)
+ {
+ reg = po->operand[0].reg;
+ if (reg < 0)
+ ferr(po, "reg not set for push?\n");
+
+ if (po->flags & OPF_RSAVE) {
+ regmask_save |= 1 << reg;
+ continue;
+ }
+ if (po->flags & OPF_DONE)
+ continue;
+
+ depth = 0;
+ ret = scan_for_pop(i + 1, opcnt,
+ po->operand[0].name, i + opcnt * 2, 0, &depth, 0);
+ if (ret == 1) {
+ regmask_save |= 1 << reg;
+ po->flags |= OPF_RMD;
+ scan_for_pop(i + 1, opcnt,
+ po->operand[0].name, i + opcnt * 3, 0, &depth, 1);
+ continue;
+ }
+ }
+ else if (po->flags & OPF_RMD)
+ continue;
+ else if (po->op == OP_CALL) {
+ po->regmask_dst |= 1 << xAX;
+
+ dep = hg_fp_find_dep(fp, po->operand[0].name);
+ if (dep != NULL)
+ dep->regmask_live = regmask_save | regmask_dst;
+ }
+ else if (po->op == OP_RET) {
+ if (po->operand_cnt > 0) {
+ fp->is_stdcall = 1;
+ if (fp->argc_stack >= 0
+ && fp->argc_stack != po->operand[0].val / 4)
+ ferr(po, "ret mismatch? (%d)\n", fp->argc_stack * 4);
+ fp->argc_stack = po->operand[0].val / 4;
+ }
+ }
+
+ if (*has_ret != 0 && (po->flags & OPF_TAIL)) {
+ if (po->op == OP_CALL) {
+ j = i;
+ ret = 1;
+ }
+ else {
+ struct parsed_opr opr = { 0, };
+ opr.type = OPT_REG;
+ opr.reg = xAX;
+ j = -1;
+ from_caller = 0;
+ ret = resolve_origin(i, &opr, i + opcnt * 4, &j, &from_caller);
+ }
+
+ if (ret == -1 && from_caller) {
+ // unresolved eax - probably void func
+ *has_ret = 0;
+ }
+ else {
+ if (ops[j].op == OP_CALL) {
+ dep = hg_fp_find_dep(fp, po->operand[0].name);
+ if (dep != NULL)
+ dep->ret_dep = 1;
+ else
+ *has_ret = 1;
+ }
+ else
+ *has_ret = 1;
+ }
+ }
+
+ l = regmask_save | regmask_dst;
+ if (g_bp_frame && !(po->flags & OPF_EBP_S))
+ l |= 1 << xBP;
+
+ l = po->regmask_src & ~l;
+#if 0
+ if (l)
+ fnote(po, "dep |= %04x, dst %04x, save %04x (f %x)\n",
+ l, regmask_dst, regmask_save, po->flags);
+#endif
+ *regmask_dep |= l;
+ regmask_dst |= po->regmask_dst;
+
+ if (po->flags & OPF_TAIL)
+ return;
+ }
+}
+
static void gen_hdr(const char *funcn, int opcnt)
{
+ int save_arg_vars[MAX_ARG_GRP] = { 0, };
+ unsigned char cbits[MAX_OPS / 8];
+ const struct parsed_proto *pp_c;
+ struct parsed_proto *pp;
struct func_prototype *fp;
- struct func_proto_dep *dep;
struct parsed_data *pd;
struct parsed_op *po;
- int regmask_save = 0;
- int regmask_dst = 0;
- int regmask_dep = 0;
+ const char *tmpname;
+ int regmask_dummy = 0;
+ int regmask_dep;
int max_bp_offset = 0;
- int has_ret = -1;
- int from_caller = 0;
+ int has_ret;
int i, j, l, ret;
- int depth, reg;
if ((hg_fp_cnt & 0xff) == 0) {
hg_fp = realloc(hg_fp, sizeof(hg_fp[0]) * (hg_fp_cnt + 0x100));
fp = &hg_fp[hg_fp_cnt];
snprintf(fp->name, sizeof(fp->name), "%s", funcn);
fp->id = hg_fp_cnt;
+ fp->argc_stack = -1;
hg_fp_cnt++;
+ // perhaps already in seed header?
+ fp->pp = proto_parse(g_fhdr, funcn, 1);
+ if (fp->pp != NULL) {
+ fp->argc_stack = fp->pp->argc_stack;
+ fp->is_stdcall = fp->pp->is_stdcall;
+ fp->regmask_dep = get_pp_arg_regmask(fp->pp);
+ fp->has_ret = !IS(fp->pp->ret_type.name, "void");
+ return;
+ }
+
+ g_bp_frame = g_sp_frame = g_stack_fsz = 0;
+ g_stack_frame_used = 0;
+
// pass1:
+ // - handle ebp/esp frame, remove ops related to it
+ scan_prologue_epilogue(opcnt);
+
+ // pass2:
// - collect calls
// - resolve all branches
for (i = 0; i < opcnt; i++)
po->bt_i = -1;
po->btj = NULL;
- if (po->flags & OPF_RMD)
+ if (po->flags & (OPF_RMD|OPF_DONE))
continue;
if (po->op == OP_CALL) {
- if (po->operand[0].type == OPT_LABEL)
- hg_fp_add_dep(fp, opr_name(po, 0));
+ tmpname = opr_name(po, 0);
+ pp = NULL;
+ if (po->operand[0].type == OPT_LABEL) {
+ hg_fp_add_dep(fp, tmpname);
+
+ // perhaps a call to already known func?
+ pp_c = proto_parse(g_fhdr, tmpname, 1);
+ if (pp_c != NULL)
+ pp = proto_clone(pp_c);
+ }
+ else if (po->datap != NULL) {
+ pp = calloc(1, sizeof(*pp));
+ my_assert_not(pp, NULL);
+
+ ret = parse_protostr(po->datap, pp);
+ if (ret < 0)
+ ferr(po, "bad protostr supplied: %s\n", (char *)po->datap);
+ free(po->datap);
+ po->datap = NULL;
+ }
+ if (pp != NULL && pp->is_noreturn)
+ po->flags |= OPF_TAIL;
+ po->pp = pp;
continue;
}
}
for (l = 0; l < opcnt; l++) {
- if (g_labels[l][0] && IS(po->operand[0].name, g_labels[l])) {
+ if (g_labels[l] != NULL
+ && IS(po->operand[0].name, g_labels[l]))
+ {
add_label_ref(&g_label_refs[l], i);
po->bt_i = l;
break;
i--; // reprocess
}
- // pass2:
+ // pass3:
// - remove dead labels
+ // - handle push <const>/pop pairs
for (i = 0; i < opcnt; i++)
{
- if (g_labels[i][0] != 0 && g_label_refs[i].i == -1)
- g_labels[i][0] = 0;
+ if (g_labels[i] != NULL && g_label_refs[i].i == -1) {
+ free(g_labels[i]);
+ g_labels[i] = NULL;
+ }
+
+ po = &ops[i];
+ if (po->flags & (OPF_RMD|OPF_DONE))
+ continue;
+
+ if (po->op == OP_PUSH && po->operand[0].type == OPT_CONST)
+ scan_for_pop_const(i, opcnt, ®mask_dummy);
}
- // pass3:
- // - track saved regs
- // - try to figure out arg-regs
+ // pass4:
+ // - process trivial calls
for (i = 0; i < opcnt; i++)
{
po = &ops[i];
- if (po->flags & OPF_RMD)
+ if (po->flags & (OPF_RMD|OPF_DONE))
continue;
- if (po->op == OP_PUSH && po->operand[0].type == OPT_REG)
+ if (po->op == OP_CALL)
{
- reg = po->operand[0].reg;
- if (reg < 0)
- ferr(po, "reg not set for push?\n");
+ pp = process_call_early(i, opcnt, &j);
+ if (pp != NULL) {
+ if (!(po->flags & OPF_ATAIL))
+ // since we know the args, try to collect them
+ if (collect_call_args_early(po, i, pp, ®mask_dummy) != 0)
+ pp = NULL;
+ }
- depth = 0;
- ret = scan_for_pop(i + 1, opcnt,
- po->operand[0].name, i + opcnt * 1, 0, &depth, 0);
- if (ret == 1) {
- regmask_save |= 1 << reg;
- po->flags |= OPF_RMD;
- scan_for_pop(i + 1, opcnt,
- po->operand[0].name, i + opcnt * 2, 0, &depth, 1);
- continue;
+ if (pp != NULL) {
+ if (j >= 0) {
+ // commit esp adjust
+ ops[j].flags |= OPF_RMD;
+ if (ops[j].op != OP_POP)
+ patch_esp_adjust(&ops[j], pp->argc_stack * 4);
+ else
+ ops[j].flags |= OPF_DONE;
+ }
+
+ po->flags |= OPF_DONE;
}
+ }
+ }
+
+ // pass5:
+ // - track saved regs (simple)
+ // - process calls
+ for (i = 0; i < opcnt; i++)
+ {
+ po = &ops[i];
+ if (po->flags & (OPF_RMD|OPF_DONE))
+ continue;
+
+ if (po->op == OP_PUSH && po->operand[0].type == OPT_REG)
+ {
ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0);
if (ret == 0) {
- regmask_save |= 1 << reg;
- po->flags |= OPF_RMD;
+ // regmask_save |= 1 << po->operand[0].reg; // do it later
+ po->flags |= OPF_RSAVE | OPF_RMD | OPF_DONE;
scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, OPF_RMD);
- continue;
}
}
- else if (po->op == OP_PUSH && po->operand[0].type == OPT_CONST) {
- for (j = i + 1; j < opcnt; j++) {
- if ((ops[j].flags & (OPF_JMP|OPF_TAIL|OPF_RSAVE))
- || ops[j].op == OP_PUSH || g_labels[i][0] != 0)
- {
- break;
- }
+ else if (po->op == OP_CALL && !(po->flags & OPF_DONE))
+ {
+ pp = process_call(i, opcnt);
- if (!(ops[j].flags & OPF_RMD) && ops[j].op == OP_POP)
- {
- po->flags |= OPF_RMD;
- ops[j].datap = po;
- break;
- }
+ if (!pp->is_unresolved && !(po->flags & OPF_ATAIL)) {
+ // since we know the args, collect them
+ ret = collect_call_args(po, i, pp, ®mask_dummy, save_arg_vars,
+ i + opcnt * 1);
}
- continue;
}
- else if (po->op == OP_CALL) {
- po->regmask_dst |= 1 << xAX;
+ }
- dep = hg_fp_find_dep(fp, po->operand[0].name);
- if (dep != NULL)
- dep->regmask_live = regmask_save | regmask_dst;
- }
- else if (po->op == OP_RET) {
- if (po->operand_cnt > 0)
- fp->is_stdcall = 1;
- }
+ // pass6
+ memset(cbits, 0, sizeof(cbits));
+ regmask_dep = 0;
+ has_ret = -1;
- if (has_ret != 0 && (po->flags & OPF_TAIL)) {
- if (po->op == OP_CALL) {
- j = i;
- ret = 1;
- }
- else {
- struct parsed_opr opr = { 0, };
- opr.type = OPT_REG;
- opr.reg = xAX;
- j = -1;
- from_caller = 0;
- ret = resolve_origin(i, &opr, i + opcnt * 3, &j, &from_caller);
- }
+ gen_hdr_dep_pass(0, opcnt, cbits, fp, 0, 0, ®mask_dep, &has_ret);
- if (ret == -1 && from_caller) {
- // unresolved eax - probably void func
- has_ret = 0;
- }
- else {
- if (ops[j].op == OP_CALL) {
- dep = hg_fp_find_dep(fp, po->operand[0].name);
- if (dep != NULL)
- dep->ret_dep = 1;
- else
- has_ret = 1;
- }
- else
- has_ret = 1;
- }
- }
+ // find unreachable code - must be fixed in IDA
+ for (i = 0; i < opcnt; i++)
+ {
+ if (cbits[i >> 3] & (1 << (i & 7)))
+ continue;
- l = po->regmask_src & ~(regmask_save | regmask_dst);
-#if 0
- if (l)
- fnote(po, "dep |= %04x, dst %04x, save %04x\n", l,
- regmask_dst, regmask_save);
-#endif
- regmask_dep |= l;
- regmask_dst |= po->regmask_dst;
+ if (ops[i].op != OP_NOP)
+ ferr(&ops[i], "unreachable code\n");
}
if (has_ret == -1 && (regmask_dep & (1 << xAX)))
has_ret = 1;
- for (i = 0; i < g_eqcnt; i++)
+ for (i = 0; i < g_eqcnt; i++) {
if (g_eqs[i].offset > max_bp_offset && g_eqs[i].offset < 4*32)
max_bp_offset = g_eqs[i].offset;
+ }
- if (max_bp_offset > 0) {
+ if (fp->argc_stack < 0) {
max_bp_offset = (max_bp_offset + 3) & ~3;
- fp->argc_stack = max_bp_offset / 4 - 1;
- if (!(g_ida_func_attr & IDAFA_BP_FRAME))
+ fp->argc_stack = max_bp_offset / 4;
+ if ((g_ida_func_attr & IDAFA_BP_FRAME) && fp->argc_stack > 0)
fp->argc_stack--;
}
fp->regmask_dep = regmask_dep & ~(1 << xSP);
fp->has_ret = has_ret;
+#if 0
+ printf("// has_ret %d, regmask_dep %x\n",
+ fp->has_ret, fp->regmask_dep);
+ output_hdr_fp(stdout, fp, 1);
+ if (IS(funcn, "sub_100073FD")) exit(1);
+#endif
+
+ gen_x_cleanup(opcnt);
}
static void hg_fp_resolve_deps(struct func_prototype *fp)
{
struct func_prototype fp_s;
+ int dep;
int i;
// this thing is recursive, so mark first..
if (!fp->dep_func[i].proto->dep_resolved)
hg_fp_resolve_deps(fp->dep_func[i].proto);
- fp->regmask_dep |= ~fp->dep_func[i].regmask_live
- & fp->dep_func[i].proto->regmask_dep;
+ dep = ~fp->dep_func[i].regmask_live
+ & fp->dep_func[i].proto->regmask_dep;
+ fp->regmask_dep |= dep;
+ // printf("dep %s %s |= %x\n", fp->name,
+ // fp->dep_func[i].name, dep);
if (fp->has_ret == -1)
fp->has_ret = fp->dep_func[i].proto->has_ret;
}
}
-static void output_hdr(FILE *fout)
+static void output_hdr_fp(FILE *fout, const struct func_prototype *fp,
+ int count)
{
- struct func_prototype *fp;
- int had_usercall = 0;
+ const struct parsed_proto *pp;
+ char *p, namebuf[NAMELEN];
+ const char *name;
int regmask_dep;
int argc_stack;
- int i, j, arg;
-
- // resolve deps
- qsort(hg_fp, hg_fp_cnt, sizeof(hg_fp[0]), hg_fp_cmp_name);
- for (i = 0; i < hg_fp_cnt; i++)
- hg_fp_resolve_deps(&hg_fp[i]);
-
- // note: messes up .proto ptr, don't use
- //qsort(hg_fp, hg_fp_cnt, sizeof(hg_fp[0]), hg_fp_cmp_id);
+ int j, arg;
- for (i = 0; i < hg_fp_cnt; i++) {
- fp = &hg_fp[i];
+ for (; count > 0; count--, fp++) {
if (fp->has_ret == -1)
fprintf(fout, "// ret unresolved\n");
#if 0
fprintf(fout, "\n");
#endif
+ p = strchr(fp->name, '@');
+ if (p != NULL) {
+ memcpy(namebuf, fp->name, p - fp->name);
+ namebuf[p - fp->name] = 0;
+ name = namebuf;
+ }
+ else
+ name = fp->name;
+ if (name[0] == '_')
+ name++;
+
+ pp = proto_parse(g_fhdr, name, 1);
+ if (pp != NULL && pp->is_include)
+ continue;
+
+ if (fp->pp != NULL) {
+ // part of seed, output later
+ continue;
+ }
+
regmask_dep = fp->regmask_dep;
argc_stack = fp->argc_stack;
- fprintf(fout, fp->has_ret ? "int " : "void ");
+ fprintf(fout, "%-5s", fp->pp ? fp->pp->ret_type.name :
+ (fp->has_ret ? "int" : "void"));
if (regmask_dep && (fp->is_stdcall || argc_stack == 0)
&& (regmask_dep & ~((1 << xCX) | (1 << xDX))) == 0)
{
- fprintf(fout, "__fastcall ");
- if (had_usercall)
- fprintf(fout, " "); // align
+ fprintf(fout, " __fastcall ");
if (!(regmask_dep & (1 << xDX)) && argc_stack == 0)
argc_stack = 1;
else
}
else if (regmask_dep && !fp->is_stdcall) {
fprintf(fout, "/*__usercall*/ ");
- had_usercall = 1;
}
else if (regmask_dep) {
fprintf(fout, "/*__userpurge*/ ");
- had_usercall = 1;
}
else if (fp->is_stdcall)
- fprintf(fout, "__stdcall ");
+ fprintf(fout, " __stdcall ");
else
- fprintf(fout, "__cdecl ");
+ fprintf(fout, " __cdecl ");
- fprintf(fout, "%s(", fp->name);
+ fprintf(fout, "%s(", name);
arg = 0;
for (j = 0; j < xSP; j++) {
arg++;
if (arg != 1)
fprintf(fout, ", ");
- fprintf(fout, "int a%d/*<%s>*/", arg, regs_r32[j]);
+ if (fp->pp != NULL)
+ fprintf(fout, "%s", fp->pp->arg[arg - 1].type.name);
+ else
+ fprintf(fout, "int");
+ fprintf(fout, " a%d/*<%s>*/", arg, regs_r32[j]);
}
}
arg++;
if (arg != 1)
fprintf(fout, ", ");
- fprintf(fout, "int a%d", arg);
+ if (fp->pp != NULL) {
+ fprintf(fout, "%s", fp->pp->arg[arg - 1].type.name);
+ if (!fp->pp->arg[arg - 1].type.is_ptr)
+ fprintf(fout, " ");
+ }
+ else
+ fprintf(fout, "int ");
+ fprintf(fout, "a%d", arg);
}
fprintf(fout, ");\n");
}
}
+static void output_hdr(FILE *fout)
+{
+ static const char *lmod_c_names[] = {
+ [OPLM_UNSPEC] = "???",
+ [OPLM_BYTE] = "uint8_t",
+ [OPLM_WORD] = "uint16_t",
+ [OPLM_DWORD] = "uint32_t",
+ [OPLM_QWORD] = "uint64_t",
+ };
+ const struct scanned_var *var;
+ char line[256] = { 0, };
+ int i;
+
+ // resolve deps
+ qsort(hg_fp, hg_fp_cnt, sizeof(hg_fp[0]), hg_fp_cmp_name);
+ for (i = 0; i < hg_fp_cnt; i++)
+ hg_fp_resolve_deps(&hg_fp[i]);
+
+ // note: messes up .proto ptr, don't use
+ //qsort(hg_fp, hg_fp_cnt, sizeof(hg_fp[0]), hg_fp_cmp_id);
+
+ // output variables
+ for (i = 0; i < hg_var_cnt; i++) {
+ var = &hg_vars[i];
+
+ if (var->pp != NULL)
+ // part of seed
+ continue;
+ else if (var->is_c_str)
+ fprintf(fout, "extern %-8s %s[];", "char", var->name);
+ else
+ fprintf(fout, "extern %-8s %s;",
+ lmod_c_names[var->lmod], var->name);
+
+ if (var->is_seeded)
+ fprintf(fout, " // seeded");
+ fprintf(fout, "\n");
+ }
+
+ fprintf(fout, "\n");
+
+ // output function prototypes
+ output_hdr_fp(fout, hg_fp, hg_fp_cnt);
+
+ // seed passthrough
+ fprintf(fout, "\n// - seed -\n");
+
+ rewind(g_fhdr);
+ while (fgets(line, sizeof(line), g_fhdr))
+ fwrite(line, 1, strlen(line), fout);
+}
+
+// read a line, truncating it if it doesn't fit
+static char *my_fgets(char *s, size_t size, FILE *stream)
+{
+ char *ret, *ret2;
+ char buf[64];
+ int p;
+
+ p = size - 2;
+ if (p >= 0)
+ s[p] = 0;
+
+ ret = fgets(s, size, stream);
+ if (ret != NULL && p >= 0 && s[p] != 0 && s[p] != '\n') {
+ p = sizeof(buf) - 2;
+ do {
+ buf[p] = 0;
+ ret2 = fgets(buf, sizeof(buf), stream);
+ }
+ while (ret2 != NULL && buf[p] != 0 && buf[p] != '\n');
+ }
+
+ return ret;
+}
+
+// '=' needs special treatment
+// also ' quote
+static char *next_word_s(char *w, size_t wsize, char *s)
+{
+ size_t i;
+
+ s = sskip(s);
+
+ i = 0;
+ if (*s == '\'') {
+ w[0] = s[0];
+ for (i = 1; i < wsize - 1; i++) {
+ if (s[i] == 0) {
+ printf("warning: missing closing quote: \"%s\"\n", s);
+ break;
+ }
+ if (s[i] == '\'')
+ break;
+ w[i] = s[i];
+ }
+ }
+
+ for (; 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;
+}
+
+static void scan_variables(FILE *fasm)
+{
+ struct scanned_var *var;
+ char line[256] = { 0, };
+ char words[3][256];
+ char *p = NULL;
+ int wordc;
+ int l;
+
+ while (!feof(fasm))
+ {
+ // skip to next data section
+ while (my_fgets(line, sizeof(line), fasm))
+ {
+ asmln++;
+
+ p = sskip(line);
+ if (*p == 0 || *p == ';')
+ continue;
+
+ p = sskip(next_word_s(words[0], sizeof(words[0]), p));
+ if (*p == 0 || *p == ';')
+ continue;
+
+ if (*p != 's' || !IS_START(p, "segment para public"))
+ continue;
+
+ break;
+ }
+
+ if (p == NULL || !IS_START(p, "segment para public"))
+ break;
+ p = sskip(p + 19);
+
+ if (!IS_START(p, "'DATA'"))
+ continue;
+
+ // now process it
+ while (my_fgets(line, sizeof(line), fasm))
+ {
+ asmln++;
+
+ p = line;
+ if (my_isblank(*p))
+ continue;
+
+ p = sskip(p);
+ if (*p == 0 || *p == ';')
+ continue;
+
+ for (wordc = 0; wordc < ARRAY_SIZE(words); wordc++) {
+ words[wordc][0] = 0;
+ p = sskip(next_word_s(words[wordc], sizeof(words[0]), p));
+ if (*p == 0 || *p == ';') {
+ wordc++;
+ break;
+ }
+ }
+
+ if (wordc == 2 && IS(words[1], "ends"))
+ break;
+ if (wordc < 2)
+ continue;
+
+ if ((hg_var_cnt & 0xff) == 0) {
+ hg_vars = realloc(hg_vars, sizeof(hg_vars[0])
+ * (hg_var_cnt + 0x100));
+ my_assert_not(hg_vars, NULL);
+ memset(hg_vars + hg_var_cnt, 0, sizeof(hg_vars[0]) * 0x100);
+ }
+
+ var = &hg_vars[hg_var_cnt++];
+ snprintf(var->name, sizeof(var->name), "%s", words[0]);
+
+ // maybe already in seed header?
+ var->pp = proto_parse(g_fhdr, var->name, 1);
+ if (var->pp != NULL) {
+ if (var->pp->is_fptr) {
+ var->lmod = OPLM_DWORD;
+ //var->is_ptr = 1;
+ }
+ else if (var->pp->is_func)
+ aerr("func?\n");
+ else if (!guess_lmod_from_c_type(&var->lmod, &var->pp->type))
+ aerr("unhandled C type '%s' for '%s'\n",
+ var->pp->type.name, var->name);
+
+ var->is_seeded = 1;
+ continue;
+ }
+
+ if (IS(words[1], "dd"))
+ var->lmod = OPLM_DWORD;
+ else if (IS(words[1], "dw"))
+ var->lmod = OPLM_WORD;
+ else if (IS(words[1], "db")) {
+ var->lmod = OPLM_BYTE;
+ if (wordc >= 3 && (l = strlen(words[2])) > 4) {
+ if (words[2][0] == '\'' && IS(words[2] + l - 2, ",0"))
+ var->is_c_str = 1;
+ }
+ }
+ else if (IS(words[1], "dq"))
+ var->lmod = OPLM_QWORD;
+ //else if (IS(words[1], "dt"))
+ else
+ aerr("type '%s' not known\n", words[1]);
+ }
+ }
+
+ rewind(fasm);
+ asmln = 0;
+}
+
static void set_label(int i, const char *name)
{
const char *p;
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_"))
+ if (g_labels[i] != NULL && !IS_START(g_labels[i], "algn_"))
aerr("dupe label '%s' vs '%s'?\n", name, g_labels[i]);
+ g_labels[i] = realloc(g_labels[i], len + 1);
+ my_assert_not(g_labels[i], NULL);
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;
oldpos = ftell(fasm);
oldasmln = asmln;
- while (fgets(line, sizeof(line), fasm))
+ while (my_fgets(line, sizeof(line), fasm))
{
wordc = 0;
asmln++;
int pending_endp = 0;
int skip_func = 0;
int skip_warned = 0;
- int header_mode = 0;
int eq_alloc;
int verbose = 0;
int multi_seg = 0;
else if (IS(argv[arg], "-m"))
multi_seg = 1;
else if (IS(argv[arg], "-hdr"))
- header_mode = g_quiet_pp = 1;
+ g_header_mode = g_quiet_pp = g_allow_regfunc = 1;
else
break;
}
if (argc < arg + 3) {
- printf("usage:\n%s [-v] [-rf] [-m] <.c> <.asm> <hdrf> [rlist]*\n"
- "%s -hdr <.h> <.asm> <seed_hdrf> [rlist]*\n",
+ printf("usage:\n%s [-v] [-rf] [-m] <.c> <.asm> <hdr.h> [rlist]*\n"
+ "%s -hdr <out.h> <.asm> <seed.h> [rlist]*\n"
+ "options:\n"
+ " -hdr - header generation mode\n"
+ " -rf - allow unannotated indirect calls\n"
+ " -m - allow multiple .text sections\n"
+ "[rlist] is a file with function names to skip,"
+ " one per line\n",
argv[0], argv[0]);
return 1;
}
frlist = fopen(argv[arg], "r");
my_assert_not(frlist, NULL);
- while (fgets(line, sizeof(line), frlist)) {
+ while (my_fgets(line, sizeof(line), frlist)) {
p = sskip(line);
if (*p == 0 || *p == ';')
continue;
g_label_refs[i].next = NULL;
}
- while (fgets(line, sizeof(line), fasm))
+ if (g_header_mode)
+ scan_variables(fasm);
+
+ while (my_fgets(line, sizeof(line), fasm))
{
wordc = 0;
asmln++;
do_pending_endp:
// do delayed endp processing to collect switch jumptables
if (pending_endp) {
- if (in_func && !skip_func && !end && wordc >= 2
+ if (in_func && !g_skip_func && !end && wordc >= 2
&& ((words[0][0] == 'd' && words[0][2] == 0)
|| (words[1][0] == 'd' && words[1][2] == 0)))
{
continue;
}
- if (in_func && !skip_func) {
- if (header_mode)
+ if (in_func && !g_skip_func) {
+ if (g_header_mode)
gen_hdr(g_func, pi);
else
gen_func(fout, g_fhdr, g_func, pi);
in_func = 0;
g_ida_func_attr = 0;
skip_warned = 0;
- skip_func = 0;
+ g_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]));
+ clear_labels(pi);
pi = 0;
}
g_eqcnt = 0;
words[0], g_func);
p = words[0];
if (bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp))
- skip_func = 1;
+ g_skip_func = 1;
strcpy(g_func, words[0]);
set_label(0, words[0]);
in_func = 1;
&& ops[0].op == OP_JMP && ops[0].operand[0].had_ds)
{
// import jump
- skip_func = 1;
+ g_skip_func = 1;
}
- if (!skip_func && func_chunks_used) {
+ if (!g_skip_func && func_chunks_used) {
// start processing chunks
struct chunk_item *ci, key = { g_func, 0 };
}
// scan for next text segment
- while (fgets(line, sizeof(line), fasm)) {
+ while (my_fgets(line, sizeof(line), fasm)) {
asmln++;
p = sskip(line);
if (*p == 0 || *p == ';')
continue;
}
- if (!in_func || skip_func) {
- if (!skip_warned && !skip_func && g_labels[pi][0] != 0) {
+ if (!in_func || g_skip_func) {
+ if (!skip_warned && !g_skip_func && g_labels[pi] != NULL) {
if (verbose)
anote("skipping from '%s'\n", g_labels[pi]);
skip_warned = 1;
}
- g_labels[pi][0] = 0;
+ free(g_labels[pi]);
+ g_labels[pi] = NULL;
continue;
}
pi++;
}
- if (header_mode)
+ if (g_header_mode)
output_hdr(fout);
fclose(fout);