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From b66e7caab9e6634dadce2aced6e174c095e1ca0e Mon Sep 17 00:00:00 2001
From: Peter Robinson <pbrobinson@gmail.com>
Date: Tue, 9 Feb 2016 15:00:02 +0000
Subject: [PATCH] Revert "powerpc: Simplify module TOC handling"
This reverts commit c153693d7eb9eeb28478aa2deaaf0b4e7b5ff5e9.
---
arch/powerpc/kernel/misc_64.S | 28 ++++++++++++++++++++++++++++
arch/powerpc/kernel/module_64.c | 12 +++---------
scripts/mod/modpost.c | 3 +--
3 files changed, 32 insertions(+), 11 deletions(-)
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index f28754c..db475d4 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -701,3 +701,31 @@ _GLOBAL(kexec_sequence)
li r5,0
blr /* image->start(physid, image->start, 0); */
#endif /* CONFIG_KEXEC */
+
+#ifdef CONFIG_MODULES
+#if defined(_CALL_ELF) && _CALL_ELF == 2
+
+#ifdef CONFIG_MODVERSIONS
+.weak __crc_TOC.
+.section "___kcrctab+TOC.","a"
+.globl __kcrctab_TOC.
+__kcrctab_TOC.:
+ .llong __crc_TOC.
+#endif
+
+/*
+ * Export a fake .TOC. since both modpost and depmod will complain otherwise.
+ * Both modpost and depmod strip the leading . so we do the same here.
+ */
+.section "__ksymtab_strings","a"
+__kstrtab_TOC.:
+ .asciz "TOC."
+
+.section "___ksymtab+TOC.","a"
+/* This symbol name is important: it's used by modpost to find exported syms */
+.globl __ksymtab_TOC.
+__ksymtab_TOC.:
+ .llong 0 /* .value */
+ .llong __kstrtab_TOC.
+#endif /* ELFv2 */
+#endif /* MODULES */
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index ac64ffd..59663af 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -326,10 +326,7 @@ static void dedotify_versions(struct modversion_info *vers,
}
}
-/*
- * Undefined symbols which refer to .funcname, hack to funcname. Make .TOC.
- * seem to be defined (value set later).
- */
+/* Undefined symbols which refer to .funcname, hack to funcname (or .TOC.) */
static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
{
unsigned int i;
@@ -337,11 +334,8 @@ static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
for (i = 1; i < numsyms; i++) {
if (syms[i].st_shndx == SHN_UNDEF) {
char *name = strtab + syms[i].st_name;
- if (name[0] == '.') {
- if (strcmp(name+1, "TOC.") == 0)
- syms[i].st_shndx = SHN_ABS;
+ if (name[0] == '.')
memmove(name, name+1, strlen(name));
- }
}
}
}
@@ -357,7 +351,7 @@ static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs,
numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym);
for (i = 1; i < numsyms; i++) {
- if (syms[i].st_shndx == SHN_ABS
+ if (syms[i].st_shndx == SHN_UNDEF
&& strcmp(strtab + syms[i].st_name, "TOC.") == 0)
return &syms[i];
}
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 48958d3..e080746 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -594,8 +594,7 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
- strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0 ||
- strcmp(symname, ".TOC.") == 0)
+ strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
return 1;
/* Do not ignore this symbol */
return 0;
--
2.5.0
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