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ARM: kprobes: Fix emulation of LDRH, STRH, LDRSB and LDRSH instructions

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The decoding of these instructions got the register indexed and
immediate indexed forms the wrong way around, causing incorrect
emulation.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-04-08 15:32:54 +01:00 committed by Nicolas Pitre
parent ec58d7f237
commit 6823fc85fc
1 changed files with 3 additions and 2 deletions
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5
arch/arm/kernel/kprobes-decode.c
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@ -883,11 +883,12 @@ emulate_alu_tests(struct kprobe *p, struct pt_regs *regs)
static enum kprobe_insn __kprobes static enum kprobe_insn __kprobes
prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi) prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi)
{ {
int ibit = (insn & (1 << 26)) ? 25 : 22; int not_imm = (insn & (1 << 26)) ? (insn & (1 << 25))
: (~insn & (1 << 22));
insn &= 0xfff00fff; insn &= 0xfff00fff;
insn |= 0x00001000; /* Rn = r0, Rd = r1 */ insn |= 0x00001000; /* Rn = r0, Rd = r1 */
if (insn & (1 << ibit)) { if (not_imm) {
insn &= ~0xf; insn &= ~0xf;
insn |= 2; /* Rm = r2 */ insn |= 2; /* Rm = r2 */
} }