diff options
| author | Anton Blanchard <anton@samba.org> | 2014-07-03 09:52:56 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-07-11 10:06:03 +0400 |
| commit | aaad42248202cbdcda7417ae8af2674f03ff9071 (patch) | |
| tree | 7aa3b9d4bf2831074627749d08400709210a4a68 | |
| parent | cc1adb5f32557f10f48e8febbef7278a2db9d593 (diff) | |
| download | linux-aaad42248202cbdcda7417ae8af2674f03ff9071.tar.xz | |
powerpc/pseries: Optimise hcall tracepoints
Now that we execute the hcall tracepoint entry and exit code out of
line, we can use the same stack across both functions.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/platforms/pseries/hvCall.S | 38 |
1 files changed, 16 insertions, 22 deletions
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S index 2f51abf6afa3..3fda3f17b84e 100644 --- a/arch/powerpc/platforms/pseries/hvCall.S +++ b/arch/powerpc/platforms/pseries/hvCall.S @@ -46,33 +46,27 @@ hcall_tracepoint_refcount: addi r4,r1,STK_PARAM(FIRST_REG); \ stdu r1,-STACK_FRAME_OVERHEAD(r1); \ bl __trace_hcall_entry; \ - addi r1,r1,STACK_FRAME_OVERHEAD; \ - ld r0,16(r1); \ - ld r3,STK_PARAM(R3)(r1); \ - ld r4,STK_PARAM(R4)(r1); \ - ld r5,STK_PARAM(R5)(r1); \ - ld r6,STK_PARAM(R6)(r1); \ - ld r7,STK_PARAM(R7)(r1); \ - ld r8,STK_PARAM(R8)(r1); \ - ld r9,STK_PARAM(R9)(r1); \ - ld r10,STK_PARAM(R10)(r1); \ - mtlr r0 + ld r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \ + ld r4,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1); \ + ld r5,STACK_FRAME_OVERHEAD+STK_PARAM(R5)(r1); \ + ld r6,STACK_FRAME_OVERHEAD+STK_PARAM(R6)(r1); \ + ld r7,STACK_FRAME_OVERHEAD+STK_PARAM(R7)(r1); \ + ld r8,STACK_FRAME_OVERHEAD+STK_PARAM(R8)(r1); \ + ld r9,STACK_FRAME_OVERHEAD+STK_PARAM(R9)(r1); \ + ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R10)(r1) /* * postcall is performed immediately before function return which * allows liberal use of volatile registers. */ #define __HCALL_INST_POSTCALL \ - mflr r0; \ - ld r6,STK_PARAM(R3)(r1); \ - std r3,STK_PARAM(R3)(r1); \ + ld r0,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \ + std r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \ mr r4,r3; \ - mr r3,r6; \ - std r0,16(r1); \ - stdu r1,-STACK_FRAME_OVERHEAD(r1); \ + mr r3,r0; \ bl __trace_hcall_exit; \ + ld r0,STACK_FRAME_OVERHEAD+16(r1); \ addi r1,r1,STACK_FRAME_OVERHEAD; \ - ld r0,16(r1); \ ld r3,STK_PARAM(R3)(r1); \ mtlr r0 @@ -279,14 +273,14 @@ plpar_hcall9_trace: mr r7,r8 mr r8,r9 mr r9,r10 - ld r10,STK_PARAM(R11)(r1) - ld r11,STK_PARAM(R12)(r1) - ld r12,STK_PARAM(R13)(r1) + ld r10,STACK_FRAME_OVERHEAD+STK_PARAM(R11)(r1) + ld r11,STACK_FRAME_OVERHEAD+STK_PARAM(R12)(r1) + ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R13)(r1) HVSC mr r0,r12 - ld r12,STK_PARAM(R4)(r1) + ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1) std r4,0(r12) std r5,8(r12) std r6,16(r12) |