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powerpc/pseries: Optimise hcall tracepoints

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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>
This commit is contained in:
Anton Blanchard 2014-07-03 15:52:56 +10:00 committed by Benjamin Herrenschmidt
parent cc1adb5f32
commit aaad422482
1 changed files with 16 additions and 22 deletions
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38
arch/powerpc/platforms/pseries/hvCall.S
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@ -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)