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added __start_x and __stop_x symbol generation - fp_hw fix for dynamic executables

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This commit is contained in:
bellard
2002-07-27 15:18:33 +00:00
parent 8264c257e7
commit 519ec30bcf
1 changed files with 39 additions and 7 deletions
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46
tcc.c
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@ -6962,6 +6962,8 @@ static void tcc_add_runtime(TCCState *s1)
{ {
char buf[1024]; char buf[1024];
unsigned long *ptr; unsigned long *ptr;
int i;
Section *s;
snprintf(buf, sizeof(buf), "%s/%s", tcc_lib_path, "libtcc1.o"); snprintf(buf, sizeof(buf), "%s/%s", tcc_lib_path, "libtcc1.o");
tcc_add_file(s1, buf); tcc_add_file(s1, buf);
@ -6999,6 +7001,38 @@ static void tcc_add_runtime(TCCState *s1)
bss_section->data_offset, 0, bss_section->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
bss_section->sh_num, "_end"); bss_section->sh_num, "_end");
/* add start and stop symbols for sections whose name can be
expressed in C */
for(i = 1; i < nb_sections; i++) {
s = sections[i];
if (s->sh_type == SHT_PROGBITS &&
(s->sh_flags & SHF_ALLOC)) {
const char *p;
int ch;
/* check if section name can be expressed in C */
p = s->name;
for(;;) {
ch = *p;
if (!ch)
break;
if (!isid(ch) && !isnum(ch))
goto next_sec;
p++;
}
snprintf(buf, sizeof(buf), "__start_%s", s->name);
add_elf_sym(symtab_section,
0, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
s->sh_num, buf);
snprintf(buf, sizeof(buf), "__stop_%s", s->name);
add_elf_sym(symtab_section,
s->data_offset, 0,
ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE),
s->sh_num, buf);
}
next_sec:
}
} }
/* add dynamic sections so that the executable is dynamically linked */ /* add dynamic sections so that the executable is dynamically linked */
@ -7115,13 +7149,11 @@ int tcc_output_file(TCCState *s1, const char *filename)
bss_section->data_offset = offset; bss_section->data_offset = offset;
} }
} else { } else {
/* STT_NOTYPE or STB_WEAK undefined symbols /* STB_WEAK undefined symbols are accepted */
are accepted */ /* XXX: _fp_hw seems to be part of the ABI, so we ignore
/* XXX: STT_NOTYPE is only used to exclude the it */
unreferenced '_fp_hw' symbol. need a better if (ELF32_ST_BIND(sym->st_info) == STB_WEAK ||
solution */ !strcmp(name, "_fp_hw")) {
if (ELF32_ST_TYPE(sym->st_info) == STT_NOTYPE ||
ELF32_ST_BIND(sym->st_info) == STB_WEAK) {
} else { } else {
error("undefined symbol '%s'", name); error("undefined symbol '%s'", name);
} }