diff options
| author | Rohan McLure <rmclure@linux.ibm.com> | 2022-09-21 09:55:46 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-26 16:00:15 +0300 |
| commit | 53ecaa6778d613807e590c320ccfcf48a4114108 (patch) | |
| tree | 0b2e5f7918be97dfe9c0e48c2df02ee048ae0e5a | |
| parent | 15ba74502ccfd0b34dad0ea022093ccc66b334d6 (diff) | |
| download | linux-53ecaa6778d613807e590c320ccfcf48a4114108.tar.xz | |
powerpc/64e: Clarify register saves and clears with {SAVE,ZEROIZE}_GPRS
The common interrupt handler prologue macro and the bad_stack
trampolines include consecutive sequences of register saves, and some
register clears. Neaten such instances by expanding use of the SAVE_GPRS
macro and employing the ZEROIZE_GPR macro when appropriate.
Also simplify an invocation of SAVE_GPRS targetting all non-volatile
registers to SAVE_NVGPRS.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reported-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220921065605.1051927-7-rmclure@linux.ibm.com
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64e.S | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S index 3afba070a5d8..d6b7aa0229be 100644 --- a/arch/powerpc/kernel/exceptions-64e.S +++ b/arch/powerpc/kernel/exceptions-64e.S @@ -216,17 +216,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) mtlr r10 mtcr r11 - ld r10,GPR10(r1) - ld r11,GPR11(r1) - ld r12,GPR12(r1) + REST_GPRS(10, 12, r1) mtspr \scratch,r0 std r10,\paca_ex+EX_R10(r13); std r11,\paca_ex+EX_R11(r13); ld r10,_NIP(r1) ld r11,_MSR(r1) - ld r0,GPR0(r1) - ld r1,GPR1(r1) + REST_GPR(0, r1) + REST_GPR(1, r1) mtspr \srr0,r10 mtspr \srr1,r11 ld r10,\paca_ex+EX_R10(r13) @@ -364,16 +362,15 @@ ret_from_mc_except: /* Core exception code for all exceptions except TLB misses. */ #define EXCEPTION_COMMON_LVL(n, scratch, excf) \ exc_##n##_common: \ - std r0,GPR0(r1); /* save r0 in stackframe */ \ - std r2,GPR2(r1); /* save r2 in stackframe */ \ - SAVE_GPRS(3, 9, r1); /* save r3 - r9 in stackframe */ \ + SAVE_GPR(0, r1); /* save r0 in stackframe */ \ + SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ std r10,_NIP(r1); /* save SRR0 to stackframe */ \ std r11,_MSR(r1); /* save SRR1 to stackframe */ \ beq 2f; /* if from kernel mode */ \ 2: ld r3,excf+EX_R10(r13); /* get back r10 */ \ ld r4,excf+EX_R11(r13); /* get back r11 */ \ mfspr r5,scratch; /* get back r13 */ \ - std r12,GPR12(r1); /* save r12 in stackframe */ \ + SAVE_GPR(12, r1); /* save r12 in stackframe */ \ ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \ mflr r6; /* save LR in stackframe */ \ mfctr r7; /* save CTR in stackframe */ \ @@ -382,7 +379,7 @@ exc_##n##_common: \ lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \ lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \ ld r12,exception_marker@toc(r2); \ - li r0,0; \ + ZEROIZE_GPR(0); \ std r3,GPR10(r1); /* save r10 to stackframe */ \ std r4,GPR11(r1); /* save r11 to stackframe */ \ std r5,GPR13(r1); /* save it to stackframe */ \ @@ -1048,15 +1045,14 @@ bad_stack_book3e: mfspr r11,SPRN_ESR std r10,_DEAR(r1) std r11,_ESR(r1) - std r0,GPR0(r1); /* save r0 in stackframe */ \ - std r2,GPR2(r1); /* save r2 in stackframe */ \ - SAVE_GPRS(3, 9, r1); /* save r3 - r9 in stackframe */ \ + SAVE_GPR(0, r1); /* save r0 in stackframe */ \ + SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \ ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \ ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \ mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \ std r3,GPR10(r1); /* save r10 to stackframe */ \ std r4,GPR11(r1); /* save r11 to stackframe */ \ - std r12,GPR12(r1); /* save r12 in stackframe */ \ + SAVE_GPR(12, r1); /* save r12 in stackframe */ \ std r5,GPR13(r1); /* save it to stackframe */ \ mflr r10 mfctr r11 @@ -1064,12 +1060,12 @@ bad_stack_book3e: std r10,_LINK(r1) std r11,_CTR(r1) std r12,_XER(r1) - SAVE_GPRS(14, 31, r1) + SAVE_NVGPRS(r1) lhz r12,PACA_TRAP_SAVE(r13) std r12,_TRAP(r1) addi r11,r1,INT_FRAME_SIZE std r11,0(r1) - li r12,0 + ZEROIZE_GPR(12) std r12,0(r11) ld r2,PACATOC(r13) 1: addi r3,r1,STACK_FRAME_OVERHEAD |