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ARM: 6226/1: fix kprobe bug in ldr instruction emulation 

From: Bin Yang <bin.yang@marvell.com>

Cc: stable@kernel.org
Signed-off-by: Bin Yang <bin.yang@marvell.com>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2010-07-14 05:21:22 +01:00 committed by Russell King
parent d8495378e2
commit 0ebe25f90c
1 changed files with 3 additions and 2 deletions
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5
arch/arm/kernel/kprobes-decode.c
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@ -583,13 +583,14 @@ static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
{
insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
kprobe_opcode_t insn = p->opcode;
long ppc = (long)p->addr + 8;
union reg_pair fnr;
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
long rdv;
long rnv = regs->uregs[rn];
long rmv = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
long cpsr = regs->ARM_cpsr;
fnr.dr = insnslot_llret_3arg_rflags(rnv, 0, rmv, cpsr, i_fn);