diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2020-04-01 09:17:02 +0800 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-04-03 11:14:17 +0800 |
| commit | 33e53ae1ce413a081254e686d9b27cc1b3585e2f (patch) | |
| tree | dd6ddbf5a1707f1d0351143cedc00147a465abf4 /arch/csky/kernel/probes/simulate-insn.h | |
| parent | 000591f1ca3312d9a29e15a9e3fe5c4171f75586 (diff) | |
csky: Add kprobes supported
This patch enable kprobes, kretprobes, ftrace interface. It utilized
software breakpoint and single step debug exceptions, instructions
simulation on csky.
We use USR_BKPT replace origin instruction, and the kprobe handler
prepares an excutable memory slot for out-of-line execution with a
copy of the original instruction being probed. Most of instructions
could be executed by single-step, but some instructions need origin
pc value to execute and we need software simulate these instructions.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/csky/kernel/probes/simulate-insn.h')
| -rw-r--r-- | arch/csky/kernel/probes/simulate-insn.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/csky/kernel/probes/simulate-insn.h b/arch/csky/kernel/probes/simulate-insn.h new file mode 100644 index 000000000000..ba4cb7ef062e --- /dev/null +++ b/arch/csky/kernel/probes/simulate-insn.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ + +#ifndef __CSKY_KERNEL_PROBES_SIMULATE_INSN_H +#define __CSKY_KERNEL_PROBES_SIMULATE_INSN_H + +#define __CSKY_INSN_FUNCS(name, mask, val) \ +static __always_inline bool csky_insn_is_##name(probe_opcode_t code) \ +{ \ + BUILD_BUG_ON(~(mask) & (val)); \ + return (code & (mask)) == (val); \ +} \ +void simulate_##name(u32 opcode, long addr, struct pt_regs *regs); + +#define CSKY_INSN_SET_SIMULATE(name, code) \ + do { \ + if (csky_insn_is_##name(code)) { \ + api->handler = simulate_##name; \ + return INSN_GOOD_NO_SLOT; \ + } \ + } while (0) + +__CSKY_INSN_FUNCS(br16, 0xfc00, 0x0400) +__CSKY_INSN_FUNCS(bt16, 0xfc00, 0x0800) +__CSKY_INSN_FUNCS(bf16, 0xfc00, 0x0c00) +__CSKY_INSN_FUNCS(jmp16, 0xffc3, 0x7800) +__CSKY_INSN_FUNCS(jsr16, 0xffc3, 0x7801) +__CSKY_INSN_FUNCS(lrw16, 0xfc00, 0x1000) +__CSKY_INSN_FUNCS(pop16, 0xffe0, 0x1480) + +__CSKY_INSN_FUNCS(br32, 0x0000ffff, 0x0000e800) +__CSKY_INSN_FUNCS(bt32, 0x0000ffff, 0x0000e860) +__CSKY_INSN_FUNCS(bf32, 0x0000ffff, 0x0000e840) +__CSKY_INSN_FUNCS(jmp32, 0xffffffe0, 0x0000e8c0) +__CSKY_INSN_FUNCS(jsr32, 0xffffffe0, 0x0000e8e0) +__CSKY_INSN_FUNCS(lrw32, 0x0000ffe0, 0x0000ea80) +__CSKY_INSN_FUNCS(pop32, 0xfe00ffff, 0x0000ebc0) + +__CSKY_INSN_FUNCS(bez32, 0x0000ffe0, 0x0000e900) +__CSKY_INSN_FUNCS(bnez32, 0x0000ffe0, 0x0000e920) +__CSKY_INSN_FUNCS(bnezad32, 0x0000ffe0, 0x0000e820) +__CSKY_INSN_FUNCS(bhsz32, 0x0000ffe0, 0x0000e9a0) +__CSKY_INSN_FUNCS(bhz32, 0x0000ffe0, 0x0000e940) +__CSKY_INSN_FUNCS(blsz32, 0x0000ffe0, 0x0000e960) +__CSKY_INSN_FUNCS(blz32, 0x0000ffe0, 0x0000e980) +__CSKY_INSN_FUNCS(bsr32, 0x0000fc00, 0x0000e000) +__CSKY_INSN_FUNCS(jmpi32, 0x0000ffff, 0x0000eac0) +__CSKY_INSN_FUNCS(jsri32, 0x0000ffff, 0x0000eae0) + +#endif /* __CSKY_KERNEL_PROBES_SIMULATE_INSN_H */ |