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Date: Wed, 28 May 2008 16:30:47 -0700
From: Harvey Harrison <harvey.harrison@...il.com>
To: Hirokazu Takata <takata@...ux-m32r.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] m32r: module.c use kernel-provided unaligned helpers
Replace the hand-rolled COPY_UNALIGNED_WORD/HWORD
This also possibly fixes a bug in the R_M32R_16_RELA case as it was reading
2 bytes from hlocation, applying the relocation, but writing back 4 bytes
(perhaps it meant to use COPY_UNALIGNED_HWORD rather than _WORD) two bytes of
which were not calculated. This patch writes back only two bytes as hvalue
is a short.
Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
---
arch/m32r/kernel/module.c | 150 ++++++++++++++++-----------------------------
1 files changed, 53 insertions(+), 97 deletions(-)
diff --git a/arch/m32r/kernel/module.c b/arch/m32r/kernel/module.c
index 8d42057..375ddf0 100644
--- a/arch/m32r/kernel/module.c
+++ b/arch/m32r/kernel/module.c
@@ -21,6 +21,7 @@
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
+#include <asm/unaligned.h>
#if 0
#define DEBUGP printk
@@ -57,46 +58,6 @@ int module_frob_arch_sections(Elf_Ehdr *hdr,
return 0;
}
-#define COPY_UNALIGNED_WORD(sw, tw, align) \
-{ \
- void *__s = &(sw), *__t = &(tw); \
- unsigned short *__s2 = __s, *__t2 =__t; \
- unsigned char *__s1 = __s, *__t1 =__t; \
- switch ((align)) \
- { \
- case 0: \
- *(unsigned long *) __t = *(unsigned long *) __s; \
- break; \
- case 2: \
- *__t2++ = *__s2++; \
- *__t2 = *__s2; \
- break; \
- default: \
- *__t1++ = *__s1++; \
- *__t1++ = *__s1++; \
- *__t1++ = *__s1++; \
- *__t1 = *__s1; \
- break; \
- } \
-}
-
-#define COPY_UNALIGNED_HWORD(sw, tw, align) \
- { \
- void *__s = &(sw), *__t = &(tw); \
- unsigned short *__s2 = __s, *__t2 =__t; \
- unsigned char *__s1 = __s, *__t1 =__t; \
- switch ((align)) \
- { \
- case 0: \
- *__t2 = *__s2; \
- break; \
- default: \
- *__t1++ = *__s1++; \
- *__t1 = *__s1; \
- break; \
- } \
- }
-
int apply_relocate_add(Elf32_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
@@ -112,7 +73,6 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
unsigned short *hlocation;
unsigned short hvalue;
int svalue;
- int align;
DEBUGP("Applying relocate section %u to %u\n", relsec,
sechdrs[relsec].sh_info);
@@ -125,102 +85,98 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ ELF32_R_SYM(rel[i].r_info);
relocation = sym->st_value + rel[i].r_addend;
- align = (int)location & 3;
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_M32R_32_RELA:
- COPY_UNALIGNED_WORD (*location, value, align);
+ value = get_unaligned(location);
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_HI16_ULO_RELA:
- COPY_UNALIGNED_WORD (*location, value, align);
- relocation = (relocation >>16) & 0xffff;
+ value = get_unaligned(location);
+ relocation = (relocation >> 16) & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_HI16_SLO_RELA:
- COPY_UNALIGNED_WORD (*location, value, align);
- if (relocation & 0x8000) relocation += 0x10000;
- relocation = (relocation >>16) & 0xffff;
+ value = get_unaligned(location);
+ if (relocation & 0x8000)
+ relocation += 0x10000;
+ relocation = (relocation >> 16) & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_16_RELA:
hlocation = (unsigned short *)location;
- relocation = relocation & 0xffff;
+ relocation = relocation & 0xffff;
/* RELA must has 0 at relocation field. */
hvalue = relocation;
- COPY_UNALIGNED_WORD (hvalue, *hlocation, align);
+ put_unaligned(hvalue, hlocation);
break;
case R_M32R_SDA16_RELA:
case R_M32R_LO16_RELA:
- COPY_UNALIGNED_WORD (*location, value, align);
- relocation = relocation & 0xffff;
+ value = get_unaligned(location);
+ relocation = relocation & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_24_RELA:
- COPY_UNALIGNED_WORD (*location, value, align);
- relocation = relocation & 0xffffff;
+ value = get_unaligned(location);
+ relocation = relocation & 0xffffff;
/* RELA must has 0 at relocation field. */
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_18_PCREL_RELA:
- relocation = (relocation - (Elf32_Addr) location);
- if (relocation < -0x20000 || 0x1fffc < relocation)
- {
- printk(KERN_ERR "module %s: relocation overflow: %u\n",
- me->name, relocation);
- return -ENOEXEC;
- }
- COPY_UNALIGNED_WORD (*location, value, align);
- if (value & 0xffff)
- {
- /* RELA must has 0 at relocation field. */
- printk(KERN_ERR "module %s: illegal relocation field: %u\n",
- me->name, value);
- return -ENOEXEC;
- }
- relocation = (relocation >> 2) & 0xffff;
+ relocation = (relocation - (Elf32_Addr) location);
+ if (relocation < -0x20000 || 0x1fffc < relocation) {
+ printk(KERN_ERR "module %s: relocation overflow: %u\n",
+ me->name, relocation);
+ return -ENOEXEC;
+ }
+ value = get_unaligned(location);
+ if (value & 0xffff) {
+ /* RELA must has 0 at relocation field. */
+ printk(KERN_ERR "module %s: illegal relocation field: %u\n",
+ me->name, value);
+ return -ENOEXEC;
+ }
+ relocation = (relocation >> 2) & 0xffff;
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
case R_M32R_10_PCREL_RELA:
hlocation = (unsigned short *)location;
- relocation = (relocation - (Elf32_Addr) location);
- COPY_UNALIGNED_HWORD (*hlocation, hvalue, align);
+ relocation = (relocation - (Elf32_Addr) location);
+ hvalue = get_unaligned(hlocation);
svalue = (int)hvalue;
svalue = (signed char)svalue << 2;
relocation += svalue;
- relocation = (relocation >> 2) & 0xff;
+ relocation = (relocation >> 2) & 0xff;
hvalue = hvalue & 0xff00;
hvalue += relocation;
- COPY_UNALIGNED_HWORD (hvalue, *hlocation, align);
+ put_unaligned(hvalue, hlocation);
break;
case R_M32R_26_PCREL_RELA:
- relocation = (relocation - (Elf32_Addr) location);
- if (relocation < -0x2000000 || 0x1fffffc < relocation)
- {
- printk(KERN_ERR "module %s: relocation overflow: %u\n",
- me->name, relocation);
- return -ENOEXEC;
- }
- COPY_UNALIGNED_WORD (*location, value, align);
- if (value & 0xffffff)
- {
- /* RELA must has 0 at relocation field. */
- printk(KERN_ERR "module %s: illegal relocation field: %u\n",
- me->name, value);
- return -ENOEXEC;
- }
- relocation = (relocation >> 2) & 0xffffff;
+ relocation = (relocation - (Elf32_Addr) location);
+ if (relocation < -0x2000000 || 0x1fffffc < relocation) {
+ printk(KERN_ERR "module %s: relocation overflow: %u\n",
+ me->name, relocation);
+ return -ENOEXEC;
+ }
+ value = get_unaligned(location);
+ if (value & 0xffffff) {
+ /* RELA must has 0 at relocation field. */
+ printk(KERN_ERR "module %s: illegal relocation field: %u\n",
+ me->name, value);
+ return -ENOEXEC;
+ }
+ relocation = (relocation >> 2) & 0xffffff;
value += relocation;
- COPY_UNALIGNED_WORD (value, *location, align);
+ put_unaligned(value, location);
break;
default:
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
--
1.5.6.rc0.277.g804cf
--
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