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| 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/entry.S | |
| parent | c2d9aa3b6e56de56c7f1ed9026ca6ec7cfbeef19 (diff) | |
| download | linux-ba9c1d65991a8be2e160447dd06eb803cbb9ba61.tar.bz2 | |
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/entry.S')
| -rw-r--r-- | arch/xtensa/kernel/entry.S | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S index 2ca209e71565..59af494d9940 100644 --- a/arch/xtensa/kernel/entry.S +++ b/arch/xtensa/kernel/entry.S @@ -1895,8 +1895,6 @@ ENTRY(system_call) l32i a7, a2, PT_SYSCALL 1: - s32i a7, a1, 4 - /* syscall = sys_call_table[syscall_nr] */ movi a4, sys_call_table @@ -1930,12 +1928,8 @@ ENTRY(system_call) abi_ret(4) 1: - l32i a4, a1, 4 - l32i a3, a2, PT_SYSCALL - s32i a4, a2, PT_SYSCALL mov a6, a2 call4 do_syscall_trace_leave - s32i a3, a2, PT_SYSCALL abi_ret(4) ENDPROC(system_call) |