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__chkstk support

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This commit is contained in:
bellard 2005-04-10 22:15:08 +00:00
parent 2c538d7a2b
commit 9825011ced
2 changed files with 33 additions and 5 deletions
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37
i386-gen.c
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@ -398,6 +398,12 @@ void gfunc_call(int nb_args)
vtop--;
}
#ifdef TCC_TARGET_PE
#define FUNC_PROLOG_SIZE 10
#else
#define FUNC_PROLOG_SIZE 9
#endif
/* generate function prolog of type 't' */
void gfunc_prolog(CType *func_type)
{
@ -417,9 +423,8 @@ void gfunc_prolog(CType *func_type)
}
param_index = 0;
o(0xe58955); /* push %ebp, mov %esp, %ebp */
func_sub_sp_offset = oad(0xec81, 0); /* sub $xxx, %esp */
ind += FUNC_PROLOG_SIZE;
func_sub_sp_offset = ind;
/* if the function returns a structure, then add an
implicit pointer parameter */
func_vt = sym->type;
@ -470,6 +475,8 @@ void gfunc_prolog(CType *func_type)
/* generate function epilog */
void gfunc_epilog(void)
{
int v, saved_ind;
#ifdef CONFIG_TCC_BCHECK
if (do_bounds_check && func_bound_offset != lbounds_section->data_offset) {
int saved_ind;
@ -480,7 +487,7 @@ void gfunc_epilog(void)
*bounds_ptr = 0;
/* generate bound local allocation */
saved_ind = ind;
ind = func_sub_sp_offset + 4;
ind = func_sub_sp_offset;
sym_data = get_sym_ref(&char_pointer_type, lbounds_section,
func_bound_offset, lbounds_section->data_offset);
greloc(cur_text_section, sym_data,
@ -512,7 +519,27 @@ void gfunc_epilog(void)
g(func_ret_sub >> 8);
}
/* align local size to word & save local variables */
*(int *)(cur_text_section->data + func_sub_sp_offset) = (-loc + 3) & -4;
v = (-loc + 3) & -4;
saved_ind = ind;
ind = func_sub_sp_offset - FUNC_PROLOG_SIZE;
#ifdef TCC_TARGET_PE
if (v >= 4096) {
Sym *sym = external_global_sym(TOK___chkstk, &func_old_type, 0);
oad(0xb8, v); /* mov stacksize, %eax */
oad(0xe8, -4); /* call __chkstk, (does the stackframe too) */
greloc(cur_text_section, sym, ind-4, R_386_PC32);
} else
#endif
{
o(0xe58955); /* push %ebp, mov %esp, %ebp */
o(0xec81); /* sub esp, stacksize */
gen_le32(v);
#if FUNC_PROLOG_SIZE == 10
o(0x90); /* adjust to FUNC_PROLOG_SIZE */
#endif
}
ind = saved_ind;
}
/* generate a jump to a label */

1
tcctok.h
View File

@ -155,6 +155,7 @@
DEF(TOK___fixunssfdi, "__fixunssfdi")
DEF(TOK___fixunsdfdi, "__fixunsdfdi")
DEF(TOK___fixunsxfdi, "__fixunsxfdi")
DEF(TOK___chkstk, "__chkstk")
/* bound checking symbols */
#ifdef CONFIG_TCC_BCHECK