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Add linenumber filename support for bounds checking.

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This commit is contained in:
herman ten brugge
2019-12-13 13:45:09 +01:00
parent 56e70bfa31
commit 87639aae7c
3 changed files with 154 additions and 124 deletions
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43
i386-gen.c
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@@ -1130,29 +1130,36 @@ ST_FUNC void gen_bounded_ptr_add(void)
{
/* save all temporary registers */
save_regs(0);
/* trick to get line/file_name in code */
o(0xb8);
gen_le32 (file->line_num);
{
int i;
int len;
char *cp = file->filename;
while (*cp) cp++;
while (cp != file->filename && cp[-1] != '/') cp--;
len = strlen (cp);
while (len > 0) {
memcpy (&i, cp, 4);
o(0xb8);
gen_le32 (i);
cp += 4;
len -= 4;
}
}
/* prepare fast i386 function call (args in eax and edx) */
gv2(RC_EAX, RC_EDX);
vtop -= 2;
/* add line, filename */
{
static addr_t offset;
static char last_filename[1024];
Sym *sym_data;
if (strcmp (last_filename, file->filename) != 0) {
void *ptr;
int len = strlen (file->filename) + 1;
offset = data_section->data_offset;
ptr = section_ptr_add(data_section, len);
memcpy (ptr, file->filename, len);
memcpy (last_filename, file->filename, len);
}
o(0xb9); /* mov $xx,%ecx */
gen_le32 (0);
sym_data = get_sym_ref(&char_pointer_type, data_section,
offset, data_section->data_offset);
greloca(cur_text_section, sym_data, ind - 4, R_386_32, 0);
o(0x51); /* push %ecx */
}
o(0xb9); /* mov $xx,%ecx */
gen_le32 (file->line_num);
/* do a fast function call */
gen_static_call(TOK___bound_ptr_add);
o(0x04c483); /* add $4,%esp */
/* returned pointer is in eax */
vtop++;
vtop->r = TREG_EAX | VT_BOUNDED;