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ARM: kprobes: Add emulate_rd12rn16rm0rs8_rwflags()

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This is the emulation function for the instruction format used by the
ARM data-processing instructions.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-06-09 17:35:36 +01:00 committed by Tixy
parent 7be7ee2d29
commit 9f596e5126
1 changed files with 35 additions and 0 deletions
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35
arch/arm/kernel/kprobes-arm.c
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@ -893,6 +893,41 @@ prep_emulate_rdhi16rdlo12rs8rm0_wflags(kprobe_opcode_t insn,
return INSN_GOOD;
}
static void __kprobes
emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
unsigned long pc = (unsigned long)p->addr + 8;
int rd = (insn >> 12) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
int rs = (insn >> 8) & 0xf;
register unsigned long rdv asm("r0") = regs->uregs[rd];
register unsigned long rnv asm("r2") = (rn == 15) ? pc
: regs->uregs[rn];
register unsigned long rmv asm("r3") = (rm == 15) ? pc
: regs->uregs[rm];
register unsigned long rsv asm("r1") = regs->uregs[rs];
unsigned long cpsr = regs->ARM_cpsr;
__asm__ __volatile__ (
"msr cpsr_fs, %[cpsr] \n\t"
BLX("%[fn]")
"mrs %[cpsr], cpsr \n\t"
: "=r" (rdv), [cpsr] "=r" (cpsr)
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
: "lr", "memory", "cc"
);
if (rd == 15)
alu_write_pc(rdv, regs);
else
regs->uregs[rd] = rdv;
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
}
/*
* For the instruction masking and comparisons in all the "space_*"
* functions below, Do _not_ rearrange the order of tests unless