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| 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/traps.c | |
| parent | 000591f1ca3312d9a29e15a9e3fe5c4171f75586 (diff) | |
| download | linux-33e53ae1ce413a081254e686d9b27cc1b3585e2f.tar.bz2 | |
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/traps.c')
| -rw-r--r-- | arch/csky/kernel/traps.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/csky/kernel/traps.c b/arch/csky/kernel/traps.c index 63715cb90ee9..c6a40806977f 100644 --- a/arch/csky/kernel/traps.c +++ b/arch/csky/kernel/traps.c @@ -14,6 +14,7 @@ #include <linux/kallsyms.h> #include <linux/rtc.h> #include <linux/uaccess.h> +#include <linux/kprobes.h> #include <asm/setup.h> #include <asm/traps.h> @@ -109,7 +110,6 @@ void buserr(struct pt_regs *regs) force_sig_fault(SIGSEGV, 0, (void __user *)regs->pc); } -#define USR_BKPT 0x1464 asmlinkage void trap_c(struct pt_regs *regs) { int sig; @@ -126,11 +126,19 @@ asmlinkage void trap_c(struct pt_regs *regs) break; /* ptrace */ case VEC_TRACE: +#ifdef CONFIG_KPROBES + if (kprobe_single_step_handler(regs)) + return; +#endif info.si_code = TRAP_TRACE; sig = SIGTRAP; break; case VEC_ILLEGAL: tsk->thread.trap_no = vector; +#ifdef CONFIG_KPROBES + if (kprobe_breakpoint_handler(regs)) + return; +#endif die_if_kernel("Kernel mode ILLEGAL", regs, vector); #ifndef CONFIG_CPU_NO_USER_BKPT if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) |