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outcoff.c: Added support for 'function' type on global symbols.

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Setting the symbol type is necessary for the control flow guard (CFG)
stuff on windows.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
knut st. osmundsen 2026-05-11 01:19:23 +02:00 • committed by H. Peter Anvin (Intel)
parent 3ad8e6c533
commit c8be7b7a3f
1 changed files with 19 additions and 3 deletions
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22
output/outcoff.c
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@ -549,9 +549,8 @@ static void coff_deflabel(char *name, int32_t segment, int64_t offset,
int pos, section;
struct coff_Symbol *sym;
if (special)
nasm_nonfatal("COFF format does not support any"
" special symbol types");
nasm_debug(2, " coff_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s, coff_nsyms=%"PRIu32"\n",
name, segment, offset, is_global, special, coff_nsyms);
if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
if (strcmp(name,WRT_IMAGEBASE) && strcmp(name, WRT_SYMTAB))
@ -559,6 +558,9 @@ static void coff_deflabel(char *name, int32_t segment, int64_t offset,
return;
}
if (is_global == 3) /* discard special-retry from pass two. */
return;
if (segment == NO_SEG)
section = -1; /* absolute symbol */
else {
@ -608,6 +610,20 @@ static void coff_deflabel(char *name, int32_t segment, int64_t offset,
else
sym->value = (sym->section == 0 ? 0 : offset);
if (special) {
special = nasm_skip_spaces(special);
while (*special) {
const char *wend = nasm_skip_word(special);
size_t wlen = wend - special;
if (wlen == 8 && !nasm_strnicmp(special, "function", 8))
sym->type = 0x20; /* DT_FCN */
else
nasm_nonfatal("unrecognised symbol type `%*.*s' on `%s'",
(int)wlen, (int)wlen, special, name);
special = nasm_skip_spaces(wend);
}
}
/*
* define the references from external-symbol segment numbers
* to these symbol records.