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| author | Roland McGrath <roland@redhat.com> | 2008-07-27 16:51:03 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-07-28 16:30:49 +1000 |
| commit | 4f72c4279eab1e5f3ed1ac4e55d4527617582392 (patch) | |
| tree | 5a170211e0206d4d17a008dec9c88827c95c1152 /arch/powerpc/kernel/entry_64.S | |
| parent | 6558ba2b5cc3a2f22039db30616fcd07c1b28ac8 (diff) | |
| download | lwn-4f72c4279eab1e5f3ed1ac4e55d4527617582392.tar.gz lwn-4f72c4279eab1e5f3ed1ac4e55d4527617582392.zip | |
powerpc: Make syscall tracing use tracehook.h helpers
This changes powerpc syscall tracing to use the new tracehook.h entry
points. There is no change, only cleanup.
In addition, the assembly changes allow do_syscall_trace_enter() to
abort the syscall without losing the information about the original
r0 value.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index d7369243ae44..79c089e97ce4 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -214,7 +214,12 @@ syscall_dotrace: bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl .do_syscall_trace_enter - ld r0,GPR0(r1) /* Restore original registers */ + /* + * Restore argument registers possibly just changed. + * We use the return value of do_syscall_trace_enter + * for the call number to look up in the table (r0). + */ + mr r0,r3 ld r3,GPR3(r1) ld r4,GPR4(r1) ld r5,GPR5(r1) |