diff options
| author | Mark Salter | 2009-06-17 22:51:11 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2009-06-18 13:10:33 -0700 |
| commit | 5ae8606d5746bc84e19018fc3753cc1faf18843f (patch) | |
| tree | b90484b42af54c43d9cce4ff089ae3b994b91e3f /arch/mn10300 | |
| parent | d2829224619866daf336141b71550e223a198838 (diff) | |
MN10300: Add support for new ELF relocs in kernel modules
Add support for new relocs which may show up in MN10300 kernel modules due to
linker relaxation.
Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/mn10300')
| -rw-r--r-- | arch/mn10300/include/asm/elf.h | 2 | ||||
| -rw-r--r-- | arch/mn10300/kernel/module.c | 39 |
2 files changed, 38 insertions, 3 deletions
diff --git a/arch/mn10300/include/asm/elf.h b/arch/mn10300/include/asm/elf.h index 49105462e6fc..75a70aa9fd6f 100644 --- a/arch/mn10300/include/asm/elf.h +++ b/arch/mn10300/include/asm/elf.h @@ -28,6 +28,8 @@ #define R_MN10300_PCREL8 6 /* PC-relative 8-bit signed. */ #define R_MN10300_24 9 /* Direct 24 bit. */ #define R_MN10300_RELATIVE 23 /* Adjust by program base. */ +#define R_MN10300_SYM_DIFF 33 /* Adjustment when relaxing. */ +#define R_MN10300_ALIGN 34 /* Alignment requirement. */ /* * ELF register definitions.. diff --git a/arch/mn10300/kernel/module.c b/arch/mn10300/kernel/module.c index 4fa0e3648d8e..6aea7fd76993 100644 --- a/arch/mn10300/kernel/module.c +++ b/arch/mn10300/kernel/module.c @@ -1,6 +1,6 @@ /* MN10300 Kernel module helper routines * - * Copyright (C) 2007, 2008 Red Hat, Inc. All Rights Reserved. + * Copyright (C) 2007, 2008, 2009 Red Hat, Inc. All Rights Reserved. * Written by Mark Salter (msalter@redhat.com) * - Derived from arch/i386/kernel/module.c * @@ -103,10 +103,10 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, unsigned int relsec, struct module *me) { - unsigned int i; + unsigned int i, sym_diff_seen = 0; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; - Elf32_Addr relocation; + Elf32_Addr relocation, sym_diff_val = 0; uint8_t *location; uint32_t value; @@ -126,6 +126,22 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, /* this is the adjustment to be made */ relocation = sym->st_value + rel[i].r_addend; + if (sym_diff_seen) { + switch (ELF32_R_TYPE(rel[i].r_info)) { + case R_MN10300_32: + case R_MN10300_24: + case R_MN10300_16: + case R_MN10300_8: + relocation -= sym_diff_val; + sym_diff_seen = 0; + break; + default: + printk(KERN_ERR "module %s: Unexpected SYM_DIFF relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } + } + switch (ELF32_R_TYPE(rel[i].r_info)) { /* for the first four relocation types, we simply * store the adjustment at the location given */ @@ -157,12 +173,29 @@ int apply_relocate_add(Elf32_Shdr *sechdrs, *location = relocation - (uint32_t) location; break; + case R_MN10300_SYM_DIFF: + /* This is used to adjust the next reloc as required + * by relaxation. */ + sym_diff_seen = 1; + sym_diff_val = sym->st_value; + break; + + case R_MN10300_ALIGN: + /* Just ignore the ALIGN relocs. + * Only interesting if kernel performed relaxation. */ + continue; + default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } + if (sym_diff_seen) { + printk(KERN_ERR "module %s: Nothing follows SYM_DIFF relocation: %u\n", + me->name, ELF32_R_TYPE(rel[i].r_info)); + return -ENOEXEC; + } return 0; } |