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ARM: kprobes: Decode 32-bit Thumb long multiply and divide 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 2011-07-03 15:15:11 +01:00 committed by Tixy
parent 31656c1a9a
commit 231fb150c6
1 changed files with 55 additions and 0 deletions
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55
arch/arm/kernel/kprobes-thumb.c
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@ -289,6 +289,32 @@ t32_emulate_rd8rn16_noflags(struct kprobe *p, struct pt_regs *regs)
regs->uregs[rd] = rdv;
}
static void __kprobes
t32_emulate_rdlo12rdhi8rn16rm0_noflags(struct kprobe *p, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;
int rdlo = (insn >> 12) & 0xf;
int rdhi = (insn >> 8) & 0xf;
int rn = (insn >> 16) & 0xf;
int rm = insn & 0xf;
register unsigned long rdlov asm("r0") = regs->uregs[rdlo];
register unsigned long rdhiv asm("r1") = regs->uregs[rdhi];
register unsigned long rnv asm("r2") = regs->uregs[rn];
register unsigned long rmv asm("r3") = regs->uregs[rm];
__asm__ __volatile__ (
"blx %[fn]"
: "=r" (rdlov), "=r" (rdhiv)
: "0" (rdlov), "1" (rdhiv), "r" (rnv), "r" (rmv),
[fn] "r" (p->ainsn.insn_fn)
: "lr", "memory", "cc"
);
regs->uregs[rdlo] = rdlov;
regs->uregs[rdhi] = rdhiv;
}
static const union decode_item t32_table_1110_100x_x0xx[] = {
/* Load/store multiple instructions */
@ -763,6 +789,29 @@ static const union decode_item t32_table_1111_1010___1111[] = {
DECODE_END
};
static const union decode_item t32_table_1111_1011_1[] = {
/* Long multiply, long multiply accumulate, and divide */
/* UMAAL 1111 1011 1110 xxxx xxxx xxxx 0110 xxxx */
DECODE_OR (0xfff000f0, 0xfbe00060),
/* SMLALxy 1111 1011 1100 xxxx xxxx xxxx 10xx xxxx */
DECODE_OR (0xfff000c0, 0xfbc00080),
/* SMLALD{X} 1111 1011 1100 xxxx xxxx xxxx 110x xxxx */
/* SMLSLD{X} 1111 1011 1101 xxxx xxxx xxxx 110x xxxx */
DECODE_OR (0xffe000e0, 0xfbc000c0),
/* SMULL 1111 1011 1000 xxxx xxxx xxxx 0000 xxxx */
/* UMULL 1111 1011 1010 xxxx xxxx xxxx 0000 xxxx */
/* SMLAL 1111 1011 1100 xxxx xxxx xxxx 0000 xxxx */
/* UMLAL 1111 1011 1110 xxxx xxxx xxxx 0000 xxxx */
DECODE_EMULATEX (0xff9000f0, 0xfb800000, t32_emulate_rdlo12rdhi8rn16rm0_noflags,
REGS(NOSPPC, NOSPPC, NOSPPC, 0, NOSPPC)),
/* SDIV 1111 1011 1001 xxxx xxxx xxxx 1111 xxxx */
/* UDIV 1111 1011 1011 xxxx xxxx xxxx 1111 xxxx */
/* Other unallocated instructions... */
DECODE_END
};
const union decode_item kprobe_decode_thumb32_table[] = {
/*
@ -833,6 +882,12 @@ const union decode_item kprobe_decode_thumb32_table[] = {
*/
DECODE_TABLE (0xff00f000, 0xfa00f000, t32_table_1111_1010___1111),
/*
* Long multiply, long multiply accumulate, and divide
* 1111 1011 1xxx xxxx xxxx xxxx xxxx xxxx
*/
DECODE_TABLE (0xff800000, 0xfb800000, t32_table_1111_1011_1),
/*
* Coprocessor instructions
* 1111 11xx xxxx xxxx xxxx xxxx xxxx xxxx