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ARM: probes: Use correct action types for MOVW, SEV and WFI

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This doesn't correct any bugs when probing these instructions but makes
MOVW slightly faster and makes everything more symmetric with the Thumb
instruction cases.

We can also remove the now redundant PROBES_EMULATE_NONE and
PROBES_SIMULATE_NOP actions.

Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Jon Medhurst 2015-01-07 11:42:30 +00:00
parent fca08f326a
commit 832607e79d
4 changed files with 3 additions and 9 deletions
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6
arch/arm/probes/decode-arm.c
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@ -370,17 +370,17 @@ static const union decode_item arm_cccc_001x_table[] = {
/* MOVW cccc 0011 0000 xxxx xxxx xxxx xxxx xxxx */
/* MOVT cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx */
DECODE_EMULATEX (0x0fb00000, 0x03000000, PROBES_DATA_PROCESSING_IMM,
DECODE_EMULATEX (0x0fb00000, 0x03000000, PROBES_MOV_HALFWORD,
REGS(0, NOPC, 0, 0, 0)),
/* YIELD cccc 0011 0010 0000 xxxx xxxx 0000 0001 */
DECODE_OR (0x0fff00ff, 0x03200001),
/* SEV cccc 0011 0010 0000 xxxx xxxx 0000 0100 */
DECODE_EMULATE (0x0fff00ff, 0x03200004, PROBES_EMULATE_NONE),
DECODE_EMULATE (0x0fff00ff, 0x03200004, PROBES_SEV),
/* NOP cccc 0011 0010 0000 xxxx xxxx 0000 0000 */
/* WFE cccc 0011 0010 0000 xxxx xxxx 0000 0010 */
/* WFI cccc 0011 0010 0000 xxxx xxxx 0000 0011 */
DECODE_SIMULATE (0x0fff00fc, 0x03200000, PROBES_SIMULATE_NOP),
DECODE_SIMULATE (0x0fff00fc, 0x03200000, PROBES_WFE),
/* DBG cccc 0011 0010 0000 xxxx xxxx ffff xxxx */
/* unallocated hints cccc 0011 0010 0000 xxxx xxxx xxxx xxxx */
/* MSR (immediate) cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx */

2
arch/arm/probes/decode-arm.h
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@ -18,8 +18,6 @@
#include "decode.h"
enum probes_arm_action {
PROBES_EMULATE_NONE,
PROBES_SIMULATE_NOP,
PROBES_PRELOAD_IMM,
PROBES_PRELOAD_REG,
PROBES_BRANCH_IMM,

2
arch/arm/probes/kprobes/actions-arm.c
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@ -302,8 +302,6 @@ emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(probes_opcode_t insn,
}
const union decode_action kprobes_arm_actions[NUM_PROBES_ARM_ACTIONS] = {
[PROBES_EMULATE_NONE] = {.handler = probes_emulate_none},
[PROBES_SIMULATE_NOP] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_IMM] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_REG] = {.handler = probes_simulate_nop},
[PROBES_BRANCH_IMM] = {.handler = simulate_blx1},

2
arch/arm/probes/uprobes/actions-arm.c
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@ -195,8 +195,6 @@ uprobe_decode_ldmstm(probes_opcode_t insn,
}
const union decode_action uprobes_probes_actions[] = {
[PROBES_EMULATE_NONE] = {.handler = probes_simulate_nop},
[PROBES_SIMULATE_NOP] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_IMM] = {.handler = probes_simulate_nop},
[PROBES_PRELOAD_REG] = {.handler = probes_simulate_nop},
[PROBES_BRANCH_IMM] = {.handler = simulate_blx1},