[RFC PATCH 01/12] powerpc/kernel: Get pt_regs from r9 before calling do_syscall_trace_enter()
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2015-07-15 07:37:24
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
To call do_syscall_trace_enter() we need pt_regs in r3, but we don't need to recalculate it based on r1, it's already in r9. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/kernel/entry_64.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 579e0f9a2d57..0796c487d3db 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S@@ -243,7 +243,9 @@ syscall_error: /* Traced system call support */ syscall_dotrace: bl save_nvgprs - addi r3,r1,STACK_FRAME_OVERHEAD + + /* Get pt_regs into r3 */ + mr r3, r9 bl do_syscall_trace_enter /* * Restore argument registers possibly just changed.
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2.1.0