diff options
| author | Jon Medhurst <tixy@yxit.co.uk> | 2011-07-02 16:10:44 +0100 |
|---|---|---|
| committer | Tixy <tixy@medhuaa1.miniserver.com> | 2011-07-13 17:32:44 +0000 |
| commit | 32818f31f8ed811ea7ef924f24642580a63a7c85 (patch) | |
| tree | 3e02542ff2e32c9da7cf3d47ef742e80a215cf8b /arch | |
| parent | 2f335829040cb16d0640e87121bef208894d4934 (diff) | |
ARM: kprobes: Decode 16-bit Thumb CBZ and bit manipulation instructions
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kernel/kprobes-thumb.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes-thumb.c b/arch/arm/kernel/kprobes-thumb.c index 2b30828d5f0c..a5bdb2dc39e7 100644 --- a/arch/arm/kernel/kprobes-thumb.c +++ b/arch/arm/kernel/kprobes-thumb.c @@ -96,6 +96,20 @@ t16_simulate_add_sp_imm(struct kprobe *p, struct pt_regs *regs) regs->ARM_sp += imm * 4; } +static void __kprobes +t16_simulate_cbz(struct kprobe *p, struct pt_regs *regs) +{ + kprobe_opcode_t insn = p->opcode; + int rn = insn & 0x7; + kprobe_opcode_t nonzero = regs->uregs[rn] ? insn : ~insn; + if (nonzero & 0x800) { + long i = insn & 0x200; + long imm5 = insn & 0xf8; + unsigned long pc = thumb_probe_pc(p); + regs->ARM_pc = pc + (i >> 3) + (imm5 >> 2); + } +} + static unsigned long __kprobes t16_emulate_loregs(struct kprobe *p, struct pt_regs *regs) { @@ -180,6 +194,21 @@ static const union decode_item t16_table_1011[] = { /* SUB (SP minus immediate) 1011 0000 1xxx xxxx */ DECODE_SIMULATE (0xff00, 0xb000, t16_simulate_add_sp_imm), + /* CBZ 1011 00x1 xxxx xxxx */ + /* CBNZ 1011 10x1 xxxx xxxx */ + DECODE_SIMULATE (0xf500, 0xb100, t16_simulate_cbz), + + /* SXTH 1011 0010 00xx xxxx */ + /* SXTB 1011 0010 01xx xxxx */ + /* UXTH 1011 0010 10xx xxxx */ + /* UXTB 1011 0010 11xx xxxx */ + /* REV 1011 1010 00xx xxxx */ + /* REV16 1011 1010 01xx xxxx */ + /* ??? 1011 1010 10xx xxxx */ + /* REVSH 1011 1010 11xx xxxx */ + DECODE_REJECT (0xffc0, 0xba80), + DECODE_EMULATE (0xf500, 0xb000, t16_emulate_loregs_rwflags), + /* * If-Then, and hints * 1011 1111 xxxx xxxx |