diff options
author | Ben Dooks <ben.dooks@codethink.co.uk> | 2013-07-25 14:38:03 +0100 |
---|---|---|
committer | Ben Dooks <ben.dooks@codethink.co.uk> | 2013-10-19 20:46:35 +0100 |
commit | 63328070eff2f4fd730c86966a0dbc976147c39f (patch) | |
tree | ac939b9767e21a42a3354bdc69aaefc23e2c62d0 /arch/arm/include | |
parent | 3460743e025addc1ecbd496db2231181a2431774 (diff) | |
download | op-kernel-dev-63328070eff2f4fd730c86966a0dbc976147c39f.zip op-kernel-dev-63328070eff2f4fd730c86966a0dbc976147c39f.tar.gz |
ARM: Correct BUG() assembly to ensure it is endian-agnostic
Currently BUG() uses .word or .hword to create the necessary illegal
instructions. However if we are building BE8 then these get swapped
by the linker into different illegal instructions in the text. This
means that the BUG() macro does not get trapped properly.
Change to using <asm/opcodes.h> to provide the necessary ARM instruction
building as we cannot rely on gcc/gas having the `.inst` instructions
which where added to try and resolve this issue (reported by Dave Martin
<Dave.Martin@arm.com>).
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r-- | arch/arm/include/asm/bug.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/arm/include/asm/bug.h b/arch/arm/include/asm/bug.h index 7af5c6c..b274bde 100644 --- a/arch/arm/include/asm/bug.h +++ b/arch/arm/include/asm/bug.h @@ -2,6 +2,8 @@ #define _ASMARM_BUG_H #include <linux/linkage.h> +#include <linux/types.h> +#include <asm/opcodes.h> #ifdef CONFIG_BUG @@ -12,10 +14,10 @@ */ #ifdef CONFIG_THUMB2_KERNEL #define BUG_INSTR_VALUE 0xde02 -#define BUG_INSTR_TYPE ".hword " +#define BUG_INSTR(__value) __inst_thumb16(__value) #else #define BUG_INSTR_VALUE 0xe7f001f2 -#define BUG_INSTR_TYPE ".word " +#define BUG_INSTR(__value) __inst_arm(__value) #endif @@ -33,7 +35,7 @@ #define __BUG(__file, __line, __value) \ do { \ - asm volatile("1:\t" BUG_INSTR_TYPE #__value "\n" \ + asm volatile("1:\t" BUG_INSTR(__value) "\n" \ ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \ "2:\t.asciz " #__file "\n" \ ".popsection\n" \ @@ -48,7 +50,7 @@ do { \ #define __BUG(__file, __line, __value) \ do { \ - asm volatile(BUG_INSTR_TYPE #__value); \ + asm volatile(BUG_INSTR(__value) "\n"); \ unreachable(); \ } while (0) #endif /* CONFIG_DEBUG_BUGVERBOSE */ |