diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2019-11-25 11:51:45 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-11-29 14:39:12 -0800 |
| commit | ba9c1d65991a8be2e160447dd06eb803cbb9ba61 (patch) | |
| tree | 4ab61ab6b7bbb68a128a7a2a83551e5e901e067b /arch/xtensa/kernel/process.c | |
| parent | c2d9aa3b6e56de56c7f1ed9026ca6ec7cfbeef19 (diff) | |
| download | linux-ba9c1d65991a8be2e160447dd06eb803cbb9ba61.tar.gz | |
xtensa: rearrange syscall tracing
system_call saves and restores syscall number across system call to make
clone and execv entry and exit tracing match. This complicates things
when syscall code may be changed by ptrace.
Preserve syscall code in copy_thread and start_thread directly instead of
doing tricks in system_call.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel/process.c')
| -rw-r--r-- | arch/xtensa/kernel/process.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c index db278a9e80c7..9e1c49134c07 100644 --- a/arch/xtensa/kernel/process.c +++ b/arch/xtensa/kernel/process.c @@ -264,6 +264,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn, ®s->areg[XCHAL_NUM_AREGS - len/4], len); } + childregs->syscall = regs->syscall; + /* The thread pointer is passed in the '4th argument' (= a5) */ if (clone_flags & CLONE_SETTLS) childregs->threadptr = childregs->areg[5]; |