+/*
+ * ia32rtools
+ * (C) notaz, 2013,2014
+ *
+ * This work is licensed under the terms of 3-clause BSD license.
+ * See COPYING file in the top-level directory.
+ */
+
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
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) */
};
enum op_op {
unsigned char pfo;
unsigned char pfo_inv;
unsigned char operand_cnt;
- unsigned char pad;
+ unsigned char p_argnum; // push: altered before call arg #
+ unsigned char p_argpass;// push: arg of host func
+ unsigned char pad[3];
int regmask_src; // all referensed regs
int regmask_dst;
int pfomask; // flagop: parsed_flag_op that can't be delayed
- int argnum; // push: altered before call arg #
int cc_scratch; // scratch storage during analysis
int bt_i; // branch target for branches
struct parsed_data *btj;// branch targets for jumptables
static const char *dword_types[] = {
"int", "_DWORD", "UINT_PTR", "DWORD",
"WPARAM", "LPARAM", "UINT", "__int32",
- "LONG", "HIMC",
+ "LONG", "HIMC", "BOOL",
};
static const char *word_types[] = {
- "uint16_t", "int16_t", "_WORD",
+ "uint16_t", "int16_t", "_WORD", "WORD",
"unsigned __int16", "__int16",
};
static const char *byte_types[] = {
*bp_arg_out = bp_arg;
}
-static void stack_frame_access(struct parsed_op *po,
+static int 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)
{
int unaligned = 0;
int stack_ra = 0;
int offset = 0;
+ int retval = -1;
int sf_ofs;
int lim;
if (cast[0] == 0)
cast = "(u32)";
snprintf(buf, buf_size, "%sap", cast);
- return;
+ return -1;
}
ferr(po, "offset %d (%s,%d) doesn't map to any arg\n",
offset, bp_arg, arg_i);
ferr(po, "arg %d not in prototype?\n", arg_i);
popr->is_ptr = g_func_pp->arg[i].type.is_ptr;
+ retval = i;
switch (popr->lmod)
{
// common problem
guess_lmod_from_c_type(&tmp_lmod, &g_func_pp->arg[i].type);
if (tmp_lmod != OPLM_DWORD
- && (unaligned || (!is_src && tmp_lmod < popr->lmod)))
+ && (unaligned || (!is_src && lmod_bytes(po, tmp_lmod)
+ < lmod_bytes(po, popr->lmod) + (offset & 3))))
{
ferr(po, "bp_arg arg%d/w offset %d and type '%s' is too small\n",
i + 1, offset, g_func_pp->arg[i].type.name);
ferr(po, "bp_stack bad lmod: %d\n", popr->lmod);
}
}
+
+ return retval;
}
static void check_func_pp(struct parsed_op *po,
const struct parsed_proto *pp, const char *pfx)
{
+ enum opr_lenmod tmp_lmod;
char buf[256];
+ int ret, i;
if (pp->argc_reg != 0) {
if (/*!g_allow_regfunc &&*/ !pp->is_fastcall) {
ferr(po, "%s: %d reg arg(s) with %d stack arg(s)\n",
pfx, pp->argc_reg, pp->argc_stack);
}
+
+ // 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) {
+ 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)
+ ferr(po, "reference to %s with arg%d '%s'\n", pp->name,
+ i + 1, pp->arg[i].type.name);
+ }
+ }
}
static const char *check_label_read_ref(struct parsed_op *po,
}
if ((po->flags & OPF_RMD)
- || (po->op == OP_PUSH && po->argnum != 0)) // arg push
+ || (po->op == OP_PUSH && po->p_argnum != 0)) // arg push
continue;
if ((po->flags & OPF_JMP) && po->op != OP_CALL) {
return pp;
}
-static int try_resolve_const(int i, const struct parsed_opr *opr,
- int magic, unsigned int *val)
+// find an instruction that changed opr before i op
+// *op_i must be set to -1
+static int resolve_origin(int i, const struct parsed_opr *opr,
+ int magic, int *op_i)
{
struct label_ref *lr;
int ret = 0;
if (g_labels[i][0] != 0) {
lr = &g_label_refs[i];
for (; lr != NULL; lr = lr->next)
- ret |= try_resolve_const(lr->i, opr, magic, val);
+ ret |= resolve_origin(lr->i, opr, magic, op_i);
if (i > 0 && LAST_OP(i - 1))
return ret;
}
continue;
if (!is_opr_modified(opr, &ops[i]))
continue;
+
+ if (*op_i >= 0) {
+ if (*op_i == i)
+ return 1;
+ // XXX: could check if the other op does the same
+ return -1;
+ }
+
+ *op_i = i;
+ return 1;
+ }
+}
+
+static int try_resolve_const(int i, const struct parsed_opr *opr,
+ int magic, unsigned int *val)
+{
+ int s_i = -1;
+ int ret = 0;
+
+ ret = resolve_origin(i, opr, magic, &s_i);
+ if (ret == 1) {
+ i = s_i;
if (ops[i].op != OP_MOV && ops[i].operand[1].type != OPT_CONST)
return -1;
*val = ops[i].operand[1].val;
return 1;
}
+
+ return -1;
}
static int collect_call_args_r(struct parsed_op *po, int i,
struct parsed_proto *pp_tmp;
struct label_ref *lr;
int need_to_save_current;
+ int save_args;
int ret = 0;
- int j;
+ int reg;
+ char buf[32];
+ int j, k;
if (i < 0) {
ferr(po, "dead label encountered\n");
pp->arg[arg].datap = &ops[j];
need_to_save_current = 0;
+ save_args = 0;
+ reg = -1;
+ if (ops[j].operand[0].type == OPT_REG)
+ reg = ops[j].operand[0].reg;
+
if (!need_op_saving) {
ret = scan_for_mod(&ops[j], j + 1, i, 1);
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;
+ if (ops[j].p_argnum == 0) {
+ ops[j].p_argnum = arg + 1;
+ save_args |= 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].p_argnum < arg + 1)
+ ferr(&ops[j], "p_argnum conflict (%d<%d) for '%s'\n",
+ ops[j].p_argnum, arg + 1, pp->name);
}
- else if (ops[j].argnum == 0)
+ else if (ops[j].p_argnum == 0)
ops[j].flags |= OPF_RMD;
// some PUSHes are reused by different calls on other branches,
ops[j].flags &= ~OPF_RSAVE;
+ // check for __VALIST
+ if (!pp->is_unresolved && pp->arg[arg].type.is_va_list) {
+ k = -1;
+ ret = resolve_origin(j, &ops[j].operand[0], magic + 1, &k);
+ if (ret == 1 && k >= 0)
+ {
+ if (ops[k].op == OP_LEA) {
+ snprintf(buf, sizeof(buf), "arg_%X",
+ g_func_pp->argc_stack * 4);
+ if (!g_func_pp->is_vararg
+ || strstr(ops[k].operand[1].name, buf))
+ {
+ ops[k].flags |= OPF_RMD;
+ ops[j].flags |= OPF_RMD | OPF_VAPUSH;
+ save_args &= ~(1 << arg);
+ reg = -1;
+ }
+ else
+ ferr(&ops[j], "lea va_list used, but no vararg?\n");
+ }
+ // check for va_list from g_func_pp arg too
+ else if (ops[k].op == OP_MOV
+ && is_stack_access(&ops[k], &ops[k].operand[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[j].flags |= OPF_RMD;
+ ops[j].p_argpass = ret + 1;
+ save_args &= ~(1 << arg);
+ reg = -1;
+ }
+ }
+ }
+ }
+
+ *save_arg_vars |= save_args;
+
+ // tracking reg usage
+ if (reg >= 0)
+ *regmask |= 1 << reg;
+
arg++;
if (!pp->is_unresolved) {
// next arg
break;
}
magic = (magic & 0xffffff) | (arg << 24);
-
- // tracking reg usage
- if (ops[j].operand[0].type == OPT_REG)
- *regmask |= 1 << ops[j].operand[0].reg;
}
}
// 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)
regmask_save |= 1 << reg;
}
- if (po->op == OP_PUSH && po->argnum == 0
+ if (po->op == OP_PUSH && po->p_argnum == 0
&& !(po->flags & OPF_RSAVE) && !g_func_pp->is_userstack)
{
if (po->operand[0].type == OPT_REG)
pfomask = 1 << po->pfo;
}
- if (tmp_op->op == OP_ADD && po->pfo == PFO_C)
- need_tmp64 = 1;
+ if (tmp_op->op == OP_ADD && po->pfo == PFO_C) {
+ propagate_lmod(tmp_op, &tmp_op->operand[0],
+ &tmp_op->operand[1]);
+ if (tmp_op->operand[0].lmod == OPLM_DWORD)
+ need_tmp64 = 1;
+ }
}
if (pfomask) {
tmp_op->pfomask |= pfomask;
else if (po->op == OP_MUL
|| (po->op == OP_IMUL && po->operand_cnt == 1))
{
- need_tmp64 = 1;
+ if (po->operand[0].lmod == OPLM_DWORD)
+ need_tmp64 = 1;
}
else if (po->op == OP_CALL) {
pp = po->pp;
tmp_op = pp->arg[arg].datap;
if (tmp_op == NULL)
ferr(po, "parsed_op missing for arg%d\n", arg);
- if (tmp_op->argnum == 0 && tmp_op->operand[0].type == OPT_REG)
+ if (tmp_op->p_argnum == 0 && tmp_op->operand[0].type == OPT_REG)
regmask_stack |= 1 << tmp_op->operand[0].reg;
}
assert_operand_cnt(2);
propagate_lmod(po, &po->operand[0], &po->operand[1]);
if (pfomask & (1 << PFO_C)) {
- fprintf(fout, " tmp64 = (u64)%s + %s;\n",
- out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]),
- out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]));
- fprintf(fout, " cond_c = tmp64 >> 32;\n");
- fprintf(fout, " %s = (u32)tmp64;",
- out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]));
- strcat(g_comment, "add64");
+ out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]);
+ if (po->operand[0].lmod == OPLM_DWORD) {
+ fprintf(fout, " tmp64 = (u64)%s + %s;\n", buf1, buf2);
+ fprintf(fout, " cond_c = tmp64 >> 32;\n");
+ fprintf(fout, " %s = (u32)tmp64;",
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]));
+ strcat(g_comment, "add64");
+ }
+ else {
+ fprintf(fout, " cond_c = ((u32)%s + %s) >> %d;\n",
+ buf1, buf2, lmod_bytes(po, po->operand[0].lmod) * 8);
+ fprintf(fout, " %s += %s;",
+ out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]),
+ buf2);
+ }
pfomask &= ~(1 << PFO_C);
output_std_flags(fout, po, &pfomask, buf1);
last_arith_dst = &po->operand[0];
// fallthrough
case OP_MUL:
assert_operand_cnt(1);
- strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)");
- fprintf(fout, " tmp64 = %seax * %s%s;\n", buf1, buf1,
- out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]));
- fprintf(fout, " edx = tmp64 >> 32;\n");
- fprintf(fout, " eax = tmp64;");
+ switch (po->operand[0].lmod) {
+ case OPLM_DWORD:
+ strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)");
+ fprintf(fout, " tmp64 = %seax * %s%s;\n", buf1, buf1,
+ out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]));
+ fprintf(fout, " edx = tmp64 >> 32;\n");
+ fprintf(fout, " eax = tmp64;");
+ break;
+ case OPLM_BYTE:
+ strcpy(buf1, po->op == OP_IMUL ? "(s16)(s8)" : "(u16)(u8)");
+ fprintf(fout, " LOWORD(eax) = %seax * %s;", buf1,
+ out_src_opr(buf2, sizeof(buf2), po, &po->operand[0],
+ buf1, 0));
+ break;
+ default:
+ ferr(po, "TODO: unhandled mul type\n");
+ break;
+ }
last_arith_dst = NULL;
delayed_flag_op = NULL;
break;
tmp_op = pp->arg[arg].datap;
if (tmp_op == NULL)
ferr(po, "parsed_op missing for arg%d\n", arg);
- if (tmp_op->argnum != 0) {
- fprintf(fout, "%ss_a%d", cast, tmp_op->argnum);
+
+ if (tmp_op->flags & OPF_VAPUSH) {
+ fprintf(fout, "ap");
+ }
+ else if (tmp_op->p_argpass != 0) {
+ 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);
}
else {
fprintf(fout, "%s",
case OP_PUSH:
out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]);
- if (po->argnum != 0) {
+ if (po->p_argnum != 0) {
// special case - saved func arg
- fprintf(fout, " s_a%d = %s;", po->argnum, buf1);
+ fprintf(fout, " s_a%d = %s;", po->p_argnum, buf1);
break;
}
else if (po->flags & OPF_RSAVE) {
notaz.gp2x.de / ia32rtools.git / blobdiff