[PATCH 12/19] ARM: traps: use <asm/opcodes.h> to get correct instruction order
Dave Martin
Dave.Martin at arm.com
Wed Aug 28 07:22:53 EDT 2013
On Tue, Aug 27, 2013 at 10:38:22PM +0100, Ben Dooks wrote:
> The trap handler needs to take into account the endian configuration of
> the system when loading instructions. Use <asm/opcodes.h> to provide the
> necessary conversion functions.
>
> Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
> ---
> arch/arm/kernel/traps.c | 16 ++++++++++------
> 1 file changed, 10 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
> index ab517fc..99bcd0e3 100644
> --- a/arch/arm/kernel/traps.c
> +++ b/arch/arm/kernel/traps.c
> @@ -34,6 +34,7 @@
> #include <asm/unwind.h>
> #include <asm/tls.h>
> #include <asm/system_misc.h>
> +#include <asm/opcodes.h>
>
> static const char *handler[]= { "prefetch abort", "data abort", "address exception", "interrupt" };
>
> @@ -402,25 +403,28 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
> if (processor_mode(regs) == SVC_MODE) {
> #ifdef CONFIG_THUMB2_KERNEL
> if (thumb_mode(regs)) {
> - instr = ((u16 *)pc)[0];
> + instr = __mem_to_opcode_thumb16(((u16 *)pc)[0]);
> if (is_wide_instruction(instr)) {
> - instr <<= 16;
> - instr |= ((u16 *)pc)[1];
> + u16 inst2;
> + instr2 = __mem_to_opcode_thumb16(((u16 *)pc)[1]);
Typo?
inst2 versus instr2.
Cheers
---Dave
> + instr = __opcode_thumb32_compose(instr, instr2);
> }
> } else
> #endif
> - instr = *(u32 *) pc;
> + instr = __mem_to_opcode_arm(*(u32 *) pc);
> } else if (thumb_mode(regs)) {
> if (get_user(instr, (u16 __user *)pc))
> goto die_sig;
> + instr = __mem_to_opcode_thumb16(instr);
> if (is_wide_instruction(instr)) {
> unsigned int instr2;
> if (get_user(instr2, (u16 __user *)pc+1))
> goto die_sig;
> - instr <<= 16;
> - instr |= instr2;
> + instr2 = __mem_to_opcode_thumb16(instr2);
> + instr = __opcode_thumb32_compose(instr, instr2);
> }
> } else if (get_user(instr, (u32 __user *)pc)) {
> + instr = __mem_to_opcode_arm(instr);
> goto die_sig;
> }
>
> --
> 1.7.10.4
>
>
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