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authorSam Ravnborg <sam@mars.ravnborg.org>2006-02-19 11:53:35 +0100
committerSam Ravnborg <sam@mars.ravnborg.org>2006-02-19 11:53:35 +0100
commit93684d3b8062d1cebdeaed398ec6d1f354cb41a9 (patch)
tree65a87d5e53f8458d7574325e05f6a3cd9997e392 /scripts/mod
parent8ea80ca4f583e377c902811d42626ccfce16913f (diff)
downloadkernel-93684d3b8062d1cebdeaed398ec6d1f354cb41a9.tar.gz
kbuild: include symbol names in section mismatch warnings
Try to look up the symbol that is referenced. Include the symbol name in the warning message. Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Diffstat (limited to 'scripts/mod')
-rw-r--r--scripts/mod/modpost.c64
1 files changed, 47 insertions, 17 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index eeaf57476820..844f84b0818a 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -451,6 +451,29 @@ static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
return NULL;
}
+/**
+ * Find symbol based on relocation record info.
+ * In some cases the symbol supplied is a valid symbol so
+ * return refsym. If st_name != 0 we assume this is a valid symbol.
+ * In other cases the symbol needs to be looked up in the symbol table
+ * based on section and address.
+ * **/
+static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
+ Elf_Sym *relsym)
+{
+ Elf_Sym *sym;
+
+ if (relsym->st_name != 0)
+ return relsym;
+ for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
+ if (sym->st_shndx != relsym->st_shndx)
+ continue;
+ if (sym->st_value == addr)
+ return sym;
+ }
+ return NULL;
+}
+
/*
* Find symbols before or equal addr and after addr - in the section sec
**/
@@ -499,8 +522,9 @@ static void find_symbols_between(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)
{
- Elf_Sym *before;
- Elf_Sym *after;
+ const char *refsymname = "";
+ Elf_Sym *before, *after;
+ Elf_Sym *refsym;
Elf_Ehdr *hdr = elf->hdr;
Elf_Shdr *sechdrs = elf->sechdrs;
const char *secstrings = (void *)hdr +
@@ -509,29 +533,34 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
find_symbols_between(elf, r.r_offset, fromsec, &before, &after);
+ refsym = find_elf_symbol(elf, r.r_addend, sym);
+ if (refsym && strlen(elf->strtab + refsym->st_name))
+ refsymname = elf->strtab + refsym->st_name;
+
if (before && after) {
- warn("%s - Section mismatch: reference to %s from %s "
- "between '%s' (at offset 0x%lx) and '%s'\n",
- modname, secname, fromsec,
+ warn("%s - Section mismatch: reference to %s:%s from %s "
+ "between '%s' (at offset 0x%llx) and '%s'\n",
+ modname, secname, refsymname, fromsec,
elf->strtab + before->st_name,
- (long)(r.r_offset - before->st_value),
+ (long long)r.r_offset,
elf->strtab + after->st_name);
} else if (before) {
- warn("%s - Section mismatch: reference to %s from %s "
- "after '%s' (at offset 0x%lx)\n",
- modname, secname, fromsec,
+ warn("%s - Section mismatch: reference to %s:%s from %s "
+ "after '%s' (at offset 0x%llx)\n",
+ modname, secname, refsymname, fromsec,
elf->strtab + before->st_name,
- (long)(r.r_offset - before->st_value));
+ (long long)r.r_offset);
} else if (after) {
- warn("%s - Section mismatch: reference to %s from %s "
- "before '%s' (at offset -0x%lx)\n",
- modname, secname, fromsec,
+ warn("%s - Section mismatch: reference to %s:%s from %s "
+ "before '%s' (at offset -0x%llx)\n",
+ modname, secname, refsymname, fromsec,
elf->strtab + before->st_name,
- (long)(before->st_value - r.r_offset));
+ (long long)r.r_offset);
} else {
- warn("%s - Section mismatch: reference to %s from %s "
- "(offset 0x%lx)\n",
- modname, secname, fromsec, (long)r.r_offset);
+ warn("%s - Section mismatch: reference to %s:%s from %s "
+ "(offset 0x%llx)\n",
+ modname, secname, fromsec, refsymname,
+ (long long)r.r_offset);
}
}
@@ -575,6 +604,7 @@ static void check_sec_ref(struct module *mod, const char *modname,
const char *secname;
r.r_offset = TO_NATIVE(rela->r_offset);
r.r_info = TO_NATIVE(rela->r_info);
+ r.r_addend = TO_NATIVE(rela->r_addend);
sym = elf->symtab_start + ELF_R_SYM(r.r_info);
/* Skip special sections */
if (sym->st_shndx >= SHN_LORESERVE)