diff options
Diffstat (limited to 'arch/arm/kernel/kprobes-arm.c')
| -rw-r--r-- | arch/arm/kernel/kprobes-arm.c | 37 |
1 files changed, 20 insertions, 17 deletions
diff --git a/arch/arm/kernel/kprobes-arm.c b/arch/arm/kernel/kprobes-arm.c index 2b43d056fff5..e590ff6603c2 100644 --- a/arch/arm/kernel/kprobes-arm.c +++ b/arch/arm/kernel/kprobes-arm.c @@ -997,6 +997,23 @@ static const union decode_item arm_1111_table[] = { DECODE_END }; +static const union decode_item arm_cccc_000x_____1xx1_table[] = { + /* LDRD/STRD lr,pc,{... cccc 000x x0x0 xxxx 111x xxxx 1101 xxxx */ + DECODE_REJECT (0x0e10e0d0, 0x0000e0d0), + + /* LDRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1101 xxxx */ + /* STRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1111 xxxx */ + DECODE_EMULATEX (0x0e5000d0, 0x000000d0, emulate_ldrdstrd, + REGS(NOPCWB, NOPCX, 0, 0, NOPC)), + + /* LDRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1101 xxxx */ + /* STRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1111 xxxx */ + DECODE_EMULATEX (0x0e5000d0, 0x004000d0, emulate_ldrdstrd, + REGS(NOPCWB, NOPCX, 0, 0, 0)), + + DECODE_END +}; + static const union decode_item arm_cccc_000x_table[] = { /* Data-processing (register) */ @@ -1192,23 +1209,9 @@ space_cccc_000x(kprobe_opcode_t insn, struct arch_specific_insn *asi) } } else if ((insn & 0x0e1000d0) == 0x00000d0) { - /* STRD/LDRD */ - if ((insn & 0x0000e000) == 0x0000e000) - return INSN_REJECTED; /* Rd is LR or PC */ - if (is_writeback(insn) && is_r15(insn, 16)) - return INSN_REJECTED; /* Writeback to PC */ - - insn &= 0xfff00fff; - insn |= 0x00002000; /* Rn = r0, Rd = r2 */ - if (!(insn & (1 << 22))) { - /* Register index */ - insn &= ~0xf; - insn |= 1; /* Rm = r1 */ - } - asi->insn[0] = insn; - asi->insn_handler = - (insn & (1 << 5)) ? emulate_strd : emulate_ldrd; - return INSN_GOOD; + + return kprobe_decode_insn(insn, asi, arm_cccc_000x_____1xx1_table, + false); } /* LDRH/STRH/LDRSB/LDRSH */ |
