diff options
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/kprobes-thumb.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes-thumb.c b/arch/arm/kernel/kprobes-thumb.c index b457da0e7397..cd4d03d19950 100644 --- a/arch/arm/kernel/kprobes-thumb.c +++ b/arch/arm/kernel/kprobes-thumb.c @@ -87,6 +87,47 @@ t16_emulate_loregs_noitrwflags(struct kprobe *p, struct pt_regs *regs) regs->ARM_cpsr = cpsr; } +static void __kprobes +t16_emulate_hiregs(struct kprobe *p, struct pt_regs *regs) +{ + kprobe_opcode_t insn = p->opcode; + unsigned long pc = thumb_probe_pc(p); + int rdn = (insn & 0x7) | ((insn & 0x80) >> 4); + int rm = (insn >> 3) & 0xf; + + register unsigned long rdnv asm("r1"); + register unsigned long rmv asm("r0"); + unsigned long cpsr = regs->ARM_cpsr; + + rdnv = (rdn == 15) ? pc : regs->uregs[rdn]; + rmv = (rm == 15) ? pc : regs->uregs[rm]; + + __asm__ __volatile__ ( + "msr cpsr_fs, %[cpsr] \n\t" + "blx %[fn] \n\t" + "mrs %[cpsr], cpsr \n\t" + : "=r" (rdnv), [cpsr] "=r" (cpsr) + : "0" (rdnv), "r" (rmv), "1" (cpsr), [fn] "r" (p->ainsn.insn_fn) + : "lr", "memory", "cc" + ); + + if (rdn == 15) + rdnv &= ~1; + + regs->uregs[rdn] = rdnv; + regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK); +} + +static enum kprobe_insn __kprobes +t16_decode_hiregs(kprobe_opcode_t insn, struct arch_specific_insn *asi) +{ + insn &= ~0x00ff; + insn |= 0x001; /* Set Rdn = R1 and Rm = R0 */ + ((u16 *)asi->insn)[0] = insn; + asi->insn_handler = t16_emulate_hiregs; + return INSN_GOOD; +} + static const union decode_item t16_table_1011[] = { /* Miscellaneous 16-bit instructions */ @@ -168,6 +209,14 @@ const union decode_item kprobe_decode_thumb16_table[] = { /* BLX (register) 0100 0111 1xxx xxxx */ DECODE_SIMULATE (0xff00, 0x4700, t16_simulate_bxblx), + /* ADD pc, pc 0100 0100 1111 1111 */ + DECODE_REJECT (0xffff, 0x44ff), + + /* ADD (register) 0100 0100 xxxx xxxx */ + /* CMP (register) 0100 0101 xxxx xxxx */ + /* MOV (register) 0100 0110 xxxx xxxx */ + DECODE_CUSTOM (0xfc00, 0x4400, t16_decode_hiregs), + /* * Miscellaneous 16-bit instructions * 1011 xxxx xxxx xxxx |