diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2020-04-14 20:14:12 +0800 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-05-13 17:55:05 +0800 |
| commit | c2e59d1f4df8783856a4e6a05a7d4a76d7cf7082 (patch) | |
| tree | b4668a9c98af02140494cb7ae5ee84702f3d5c22 /arch/csky/kernel/ptrace.c | |
| parent | bd11aabd35287b6961d197539aa61da5ab8fc0d7 (diff) | |
csky: Fixup perf probe -x hungup
case:
# perf probe -x /lib/libc-2.28.9000.so memcpy
# perf record -e probe_libc:memcpy -aR sleep 1
System hangup and cpu get in trap_c loop, because our hardware
singlestep state could still get interrupt signal. When we get in
uprobe_xol singlestep slot, we should disable irq in pt_regs->psr.
And is_swbp_insn() need a csky arch implementation with a low 16bit
mask.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/csky/kernel/ptrace.c')
| -rw-r--r-- | arch/csky/kernel/ptrace.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c index 21ac2608f205..5a82230bddf9 100644 --- a/arch/csky/kernel/ptrace.c +++ b/arch/csky/kernel/ptrace.c @@ -41,6 +41,9 @@ static void singlestep_disable(struct task_struct *tsk) regs = task_pt_regs(tsk); regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_RUN; + + /* Enable irq */ + regs->sr |= BIT(6); } static void singlestep_enable(struct task_struct *tsk) @@ -49,6 +52,9 @@ static void singlestep_enable(struct task_struct *tsk) regs = task_pt_regs(tsk); regs->sr = (regs->sr & TRACE_MODE_MASK) | TRACE_MODE_SI; + + /* Disable irq */ + regs->sr &= ~BIT(6); } /* |