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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/mm | |
| 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/mm')
| -rw-r--r-- | arch/csky/mm/fault.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c index 562c7f708749..d3c61b83e195 100644 --- a/arch/csky/mm/fault.c +++ b/arch/csky/mm/fault.c @@ -18,6 +18,7 @@ #include <linux/extable.h> #include <linux/uaccess.h> #include <linux/perf_event.h> +#include <linux/kprobes.h> #include <asm/hardirq.h> #include <asm/mmu_context.h> @@ -53,6 +54,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write, int fault; unsigned long address = mmu_meh & PAGE_MASK; + if (kprobe_page_fault(regs, tsk->thread.trap_no)) + return; + si_code = SEGV_MAPERR; #ifndef CONFIG_CPU_HAS_TLBI |