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ARM: kprobes: Fix emulation of MRS instruction 

The MRS instruction should set mode and interrupt bits in the read value
so it is simpler to use a new simulation routine (simulate_mrs) rather
than some modified emulation.

prep_emulate_rd12 is now unused and removed.

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 2011-04-07 13:25:16 +01:00 committed by Nicolas Pitre
parent 51468ea91e
commit c412aba2a1
1 changed files with 12 additions and 11 deletions
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23
arch/arm/kernel/kprobes-decode.c
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@ -451,6 +451,14 @@ static void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs)
regs->ARM_cpsr |= PSR_T_BIT;
}
static void __kprobes simulate_mrs(struct kprobe *p, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rd = (insn >> 12) & 0xf;
unsigned long mask = 0xf8ff03df; /* Mask out execution state */
regs->uregs[rd] = regs->ARM_cpsr & mask;
}
static void __kprobes simulate_ldm1stm1(struct kprobe *p, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
@ -895,15 +903,6 @@ prep_emulate_rd12rm0(kprobe_opcode_t insn, struct arch_specific_insn *asi)
return INSN_GOOD;
}
static enum kprobe_insn __kprobes
prep_emulate_rd12(kprobe_opcode_t insn, struct arch_specific_insn *asi)
{
insn &= 0xffff0fff; /* Rd = r0 */
asi->insn[0] = insn;
asi->insn_handler = emulate_rd12;
return INSN_GOOD;
}
static enum kprobe_insn __kprobes
prep_emulate_rd12rn16rm0_wflags(kprobe_opcode_t insn,
struct arch_specific_insn *asi)
@ -1035,8 +1034,10 @@ space_cccc_000x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
return INSN_REJECTED;
/* MRS cpsr : cccc 0001 0000 xxxx xxxx xxxx 0000 xxxx */
if ((insn & 0x0ff000f0) == 0x01000000)
return prep_emulate_rd12(insn, asi);
if ((insn & 0x0ff000f0) == 0x01000000) {
asi->insn_handler = simulate_mrs;
return INSN_GOOD_NO_SLOT;
}
/* SMLALxy : cccc 0001 0100 xxxx xxxx xxxx 1xx0 xxxx */
if ((insn & 0x0ff00090) == 0x01400080)