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powerpc/pseries: hvcall stack frame overhead 

This call may use the min size stack frame. The scratch space used is
in the caller's parameter area frame, not this function's frame.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221127124942.1665522-6-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-11-27 22:49:30 +10:00 committed by Michael Ellerman
parent bc0677363d
commit baa49d81a9
1 changed files with 20 additions and 18 deletions
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38
arch/powerpc/platforms/pseries/hvCall.S
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@ -27,7 +27,9 @@ hcall_tracepoint_refcount:
/*
* precall must preserve all registers. use unused STK_PARAM()
* areas to save snapshots and opcode.
* areas to save snapshots and opcode. STK_PARAM() in the caller's
* frame will be available even on ELFv2 because these are all
* variadic functions.
*/
#define HCALL_INST_PRECALL(FIRST_REG) \
mflr r0; \
@ -41,29 +43,29 @@ hcall_tracepoint_refcount:
std r10,STK_PARAM(R10)(r1); \
std r0,16(r1); \
addi r4,r1,STK_PARAM(FIRST_REG); \
stdu r1,-STACK_FRAME_OVERHEAD(r1); \
stdu r1,-STACK_FRAME_MIN_SIZE(r1); \
bl __trace_hcall_entry; \
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)
ld r3,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
ld r4,STACK_FRAME_MIN_SIZE+STK_PARAM(R4)(r1); \
ld r5,STACK_FRAME_MIN_SIZE+STK_PARAM(R5)(r1); \
ld r6,STACK_FRAME_MIN_SIZE+STK_PARAM(R6)(r1); \
ld r7,STACK_FRAME_MIN_SIZE+STK_PARAM(R7)(r1); \
ld r8,STACK_FRAME_MIN_SIZE+STK_PARAM(R8)(r1); \
ld r9,STACK_FRAME_MIN_SIZE+STK_PARAM(R9)(r1); \
ld r10,STACK_FRAME_MIN_SIZE+STK_PARAM(R10)(r1)
/*
* postcall is performed immediately before function return which
* allows liberal use of volatile registers.
*/
#define __HCALL_INST_POSTCALL \
ld r0,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
std r3,STACK_FRAME_OVERHEAD+STK_PARAM(R3)(r1); \
ld r0,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
std r3,STACK_FRAME_MIN_SIZE+STK_PARAM(R3)(r1); \
mr r4,r3; \
mr r3,r0; \
bl __trace_hcall_exit; \
ld r0,STACK_FRAME_OVERHEAD+16(r1); \
addi r1,r1,STACK_FRAME_OVERHEAD; \
ld r0,STACK_FRAME_MIN_SIZE+16(r1); \
addi r1,r1,STACK_FRAME_MIN_SIZE; \
ld r3,STK_PARAM(R3)(r1); \
mtlr r0
@ -303,14 +305,14 @@ plpar_hcall9_trace:
mr r7,r8
mr r8,r9
mr r9,r10
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)
ld r10,STACK_FRAME_MIN_SIZE+STK_PARAM(R11)(r1)
ld r11,STACK_FRAME_MIN_SIZE+STK_PARAM(R12)(r1)
ld r12,STACK_FRAME_MIN_SIZE+STK_PARAM(R13)(r1)
HVSC
mr r0,r12
ld r12,STACK_FRAME_OVERHEAD+STK_PARAM(R4)(r1)
ld r12,STACK_FRAME_MIN_SIZE+STK_PARAM(R4)(r1)
std r4,0(r12)
std r5,8(r12)
std r6,16(r12)