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[RFC,1/3] powerpc/kernel: Get pt_regs from r9 before calling do_syscall_trace_enter()

Message ID 1431678580-11160-1-git-send-email-mpe@ellerman.id.au (mailing list archive)
State RFC
Headers show

Commit Message

Michael Ellerman May 15, 2015, 8:29 a.m. UTC 
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(-)
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Patch

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index afbc20019c2e..b55c393310f3 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -236,7 +236,9 @@  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.