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authorSam Ravnborg <sam@ravnborg.org>2008-01-23 19:54:27 +0100
committerSam Ravnborg <sam@ravnborg.org>2008-01-28 23:21:18 +0100
commitff13f92690249061311c7cf69a89e5a2fb068811 (patch)
treea15192d98d979afd825164ec9e999ed9a53f732f /scripts
parent157c23c80eed84194440b487658398272eaebaf4 (diff)
kbuild: introduce a few helpers in modpost
Introducing helpers to retreive symbol and section names cleaned up the code a bit. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/mod/modpost.c73
1 files changed, 38 insertions, 35 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 7dfd0395c5b..e4099cd5f08 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -605,6 +605,26 @@ static int strrcmp(const char *s, const char *sub)
return memcmp(s + slen - sublen, sub, sublen);
}
+static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
+{
+ return elf->strtab + sym->st_name;
+}
+
+static const char *sec_name(struct elf_info *elf, int shndx)
+{
+ Elf_Shdr *sechdrs = elf->sechdrs;
+ return (void *)elf->hdr +
+ elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
+ sechdrs[shndx].sh_name;
+}
+
+static const char *sech_name(struct elf_info *elf, Elf_Shdr *sechdr)
+{
+ return (void *)elf->hdr +
+ elf->sechdrs[elf->hdr->e_shstrndx].sh_offset +
+ sechdr->sh_name;
+}
+
/* if sym is empty or point to a string
* like ".[0-9]+" then return 1.
* This is the optional prefix added by ld to some sections
@@ -943,17 +963,14 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
{
Elf_Sym *sym;
Elf_Sym *near = NULL;
- Elf_Ehdr *hdr = elf->hdr;
Elf_Addr distance = ~0;
- const char *secstrings = (void *)hdr +
- elf->sechdrs[hdr->e_shstrndx].sh_offset;
for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
const char *symsec;
if (sym->st_shndx >= SHN_LORESERVE)
continue;
- symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
+ symsec = sec_name(elf, sym->st_shndx);
if (strcmp(symsec, sec) != 0)
continue;
if (!is_valid_name(elf, sym))
@@ -978,24 +995,21 @@ static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
static void warn_sec_mismatch(const char *modname, const char *fromsec,
struct elf_info *elf, Elf_Sym *sym, Elf_Rela r)
{
- const char *refsymname = "";
Elf_Sym *where;
Elf_Sym *refsym;
- Elf_Ehdr *hdr = elf->hdr;
- Elf_Shdr *sechdrs = elf->sechdrs;
- const char *secstrings = (void *)hdr +
- sechdrs[hdr->e_shstrndx].sh_offset;
- const char *secname = secstrings + sechdrs[sym->st_shndx].sh_name;
+ const char *refsymname = "";
+ const char *secname;
+ secname = sec_name(elf, sym->st_shndx);
where = find_elf_symbol2(elf, r.r_offset, fromsec);
refsym = find_elf_symbol(elf, r.r_addend, sym);
- if (refsym && strlen(elf->strtab + refsym->st_name))
- refsymname = elf->strtab + refsym->st_name;
+ if (refsym && strlen(sym_name(elf, refsym)))
+ refsymname = sym_name(elf, refsym);
/* check whitelist - we may ignore it */
if (secref_whitelist(modname, secname, fromsec,
- where ? elf->strtab + where->st_name : "",
+ where ? sym_name(elf, where) : "",
refsymname))
return;
@@ -1003,7 +1017,7 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
"in '%s'\n",
modname, fromsec, (unsigned long long)r.r_offset,
- secname, refsymname, elf->strtab + where->st_name);
+ secname, refsymname, sym_name(elf, where));
} else {
warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
modname, fromsec, (unsigned long long)r.r_offset,
@@ -1095,14 +1109,10 @@ static void section_rela(const char *modname, struct elf_info *elf,
const char *fromsec;
const char * tosec;
- Elf_Ehdr *hdr = elf->hdr;
- Elf_Rela *start = (void *)hdr + sechdr->sh_offset;
+ Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
Elf_Rela *stop = (void *)start + sechdr->sh_size;
- const char *secstrings = (void *)hdr +
- elf->sechdrs[hdr->e_shstrndx].sh_offset;
-
- fromsec = secstrings + sechdr->sh_name;
+ fromsec = sech_name(elf, sechdr);
fromsec += strlen(".rela");
/* if from section (name) is know good then skip it */
if (match(fromsec, section_white_list))
@@ -1111,7 +1121,7 @@ static void section_rela(const char *modname, struct elf_info *elf,
for (rela = start; rela < stop; rela++) {
r.r_offset = TO_NATIVE(rela->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
- if (hdr->e_machine == EM_MIPS) {
+ if (elf->hdr->e_machine == EM_MIPS) {
unsigned int r_typ;
r_sym = ELF64_MIPS_R_SYM(rela->r_info);
r_sym = TO_NATIVE(r_sym);
@@ -1131,8 +1141,7 @@ static void section_rela(const char *modname, struct elf_info *elf,
if (sym->st_shndx >= SHN_LORESERVE)
continue;
- tosec = secstrings +
- elf->sechdrs[sym->st_shndx].sh_name;
+ tosec = sec_name(elf, sym->st_shndx);
if (section_mismatch(fromsec, tosec))
warn_sec_mismatch(modname, fromsec, elf, sym, r);
}
@@ -1148,14 +1157,10 @@ static void section_rel(const char *modname, struct elf_info *elf,
const char *fromsec;
const char * tosec;
- Elf_Ehdr *hdr = elf->hdr;
- Elf_Rel *start = (void *)hdr + sechdr->sh_offset;
+ Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
Elf_Rel *stop = (void *)start + sechdr->sh_size;
- const char *secstrings = (void *)hdr +
- elf->sechdrs[hdr->e_shstrndx].sh_offset;
-
- fromsec = secstrings + sechdr->sh_name;
+ fromsec = sech_name(elf, sechdr);
fromsec += strlen(".rel");
/* if from section (name) is know good then skip it */
if (match(fromsec, section_white_list))
@@ -1164,7 +1169,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
for (rel = start; rel < stop; rel++) {
r.r_offset = TO_NATIVE(rel->r_offset);
#if KERNEL_ELFCLASS == ELFCLASS64
- if (hdr->e_machine == EM_MIPS) {
+ if (elf->hdr->e_machine == EM_MIPS) {
unsigned int r_typ;
r_sym = ELF64_MIPS_R_SYM(rel->r_info);
r_sym = TO_NATIVE(r_sym);
@@ -1179,7 +1184,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
r_sym = ELF_R_SYM(r.r_info);
#endif
r.r_addend = 0;
- switch (hdr->e_machine) {
+ switch (elf->hdr->e_machine) {
case EM_386:
if (addend_386_rel(elf, sechdr, &r))
continue;
@@ -1198,8 +1203,7 @@ static void section_rel(const char *modname, struct elf_info *elf,
if (sym->st_shndx >= SHN_LORESERVE)
continue;
- tosec = secstrings +
- elf->sechdrs[sym->st_shndx].sh_name;
+ tosec = sec_name(elf, sym->st_shndx);
if (section_mismatch(fromsec, tosec))
warn_sec_mismatch(modname, fromsec, elf, sym, r);
}
@@ -1221,11 +1225,10 @@ static void check_sec_ref(struct module *mod, const char *modname,
struct elf_info *elf)
{
int i;
- Elf_Ehdr *hdr = elf->hdr;
Elf_Shdr *sechdrs = elf->sechdrs;
/* Walk through all sections */
- for (i = 0; i < hdr->e_shnum; i++) {
+ for (i = 0; i < elf->hdr->e_shnum; i++) {
/* We want to process only relocation sections and not .init */
if (sechdrs[i].sh_type == SHT_RELA)
section_rela(modname, elf, &elf->sechdrs[i]);