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authorBen Dooks <ben.dooks@codethink.co.uk>2013-07-18 21:10:56 +0100
committerBen Dooks <ben.dooks@codethink.co.uk>2013-10-19 20:46:34 +0100
commit8592edf0dec8159fde379eb7e056eaddbbd697f2 (patch)
tree9865e21372daae64f705b167a00af979b9ff931f /arch/arm/mm
parent98dec91fa36a4a74f7c44dd2dfb000203656f4f4 (diff)
ARM: alignment: correctly decode instructions in BE8 mode.
If we are in BE8 mode, we must deal with the instruction stream being in LE order when data is being loaded in BE order. Ensure the data is swapped before processing to avoid thre following: Change to using <asm/opcodes.h> to provide the necessary conversion functions to change the byte ordering. This stops the following warning messages from the kernel on a fault: Unhandled fault: alignment exception (0x001) at 0xbfa09567 Alignment trap: not handling instruction 030091e8 at [<80333e8c>] Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Reviewed-by: Dave Martin <Dave.Martin@arm.com> Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'arch/arm/mm')
-rw-r--r--arch/arm/mm/alignment.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 6f4585b8907..924036473b1 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -25,6 +25,7 @@
#include <asm/cp15.h>
#include <asm/system_info.h>
#include <asm/unaligned.h>
+#include <asm/opcodes.h>
#include "fault.h"
@@ -762,21 +763,25 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
if (thumb_mode(regs)) {
u16 *ptr = (u16 *)(instrptr & ~1);
fault = probe_kernel_address(ptr, tinstr);
+ tinstr = __mem_to_opcode_thumb16(tinstr);
if (!fault) {
if (cpu_architecture() >= CPU_ARCH_ARMv7 &&
IS_T32(tinstr)) {
/* Thumb-2 32-bit */
u16 tinst2 = 0;
fault = probe_kernel_address(ptr + 1, tinst2);
- instr = (tinstr << 16) | tinst2;
+ tinst2 = __mem_to_opcode_thumb16(tinst2);
+ instr = __opcode_thumb32_compose(tinstr, tinst2);
thumb2_32b = 1;
} else {
isize = 2;
instr = thumb2arm(tinstr);
}
}
- } else
+ } else {
fault = probe_kernel_address(instrptr, instr);
+ instr = __mem_to_opcode_arm(instr);
+ }
if (fault) {
type = TYPE_FAULT;