From c3a08e93d66e9ba59ffbfb610af2f76b82200185 Mon Sep 17 00:00:00 2001 From: Oliver O'Halloran <oohall@gmail.com> Date: Thu, 23 Mar 2017 18:54:01 +1100 Subject: [PATCH] powerpc/powernv: de-deuplicate OPAL call wrappers Currently the code to perform an OPAL call is duplicated between the normal path and path taken when tracepoints are enabled. There's no real need for this and combining them makes opal_tracepoint_entry considerably easier to understand. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- .../powerpc/platforms/powernv/opal-wrappers.S | 53 ++++++++----------- 1 file changed, 22 insertions(+), 31 deletions(-) diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index da8a0f7a035c..ebf6719d241a 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -50,21 +50,13 @@ END_FTR_SECTION(0, 1); \ #define OPAL_BRANCH(LABEL) #endif -/* TODO: - * - * - Trace irqs in/off (needs saving/restoring all args, argh...) - * - Get r11 feed up by Dave so I can have better register usage +/* + * DO_OPAL_CALL assumes: + * r0 = opal call token + * r12 = msr + * LR has been saved */ - -#define OPAL_CALL(name, token) \ - _GLOBAL_TOC(name); \ - mfmsr r12; \ - mflr r0; \ - andi. r11,r12,MSR_IR|MSR_DR; \ - std r0,PPC_LR_STKOFF(r1); \ - li r0,token; \ - beq opal_real_call; \ - OPAL_BRANCH(opal_tracepoint_entry) \ +#define DO_OPAL_CALL() \ mfcr r11; \ stw r11,8(r1); \ li r11,0; \ @@ -83,6 +75,18 @@ END_FTR_SECTION(0, 1); \ mtspr SPRN_HSRR0,r12; \ hrfid +#define OPAL_CALL(name, token) \ + _GLOBAL_TOC(name); \ + mfmsr r12; \ + mflr r0; \ + andi. r11,r12,MSR_IR|MSR_DR; \ + std r0,PPC_LR_STKOFF(r1); \ + li r0,token; \ + beq opal_real_call; \ + OPAL_BRANCH(opal_tracepoint_entry) \ + DO_OPAL_CALL() + + opal_return: /* * Fixup endian on OPAL return... we should be able to simplify @@ -148,26 +152,13 @@ opal_tracepoint_entry: ld r8,STK_REG(R29)(r1) ld r9,STK_REG(R30)(r1) ld r10,STK_REG(R31)(r1) + + /* setup LR so we return via tracepoint_return */ LOAD_REG_ADDR(r11,opal_tracepoint_return) - mfcr r12 std r11,16(r1) - stw r12,8(r1) - li r11,0 + mfmsr r12 - ori r11,r11,MSR_EE - std r12,PACASAVEDMSR(r13) - andc r12,r12,r11 - mtmsrd r12,1 - LOAD_REG_ADDR(r11,opal_return) - mtlr r11 - li r11,MSR_DR|MSR_IR|MSR_LE - andc r12,r12,r11 - mtspr SPRN_HSRR1,r12 - LOAD_REG_ADDR(r11,opal) - ld r12,8(r11) - ld r2,0(r11) - mtspr SPRN_HSRR0,r12 - hrfid + DO_OPAL_CALL() opal_tracepoint_return: std r3,STK_REG(R31)(r1) -- 2.30.9