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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 15:50:38 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 05:22:08 +0300 |
| commit | 719e7e212c7e637a795f130dbdd5db6c291e463f (patch) | |
| tree | fb1aec6ca4bfe5d6e3481f30f749f20e67f30199 /arch/powerpc/kernel/head_40x.S | |
| parent | af6f2ce84b2f666762f75f085a7e5d6514743a84 (diff) | |
| download | linux-719e7e212c7e637a795f130dbdd5db6c291e463f.tar.xz | |
powerpc/32: Save trap number on stack in exception prolog
Saving the trap number into the stack goes into
the exception prolog, as EXC_XFER_xxx will soon disappear.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2ac7a0c9cde2ec2b23cd79e3a54cfedd816a91ae.1615552867.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_40x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_40x.S | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index a65778380704..7270caff665c 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -104,7 +104,7 @@ _ENTRY(crit_esr) * Instead we use a couple of words of memory at low physical addresses. * This is OK since we don't support SMP on these processors. */ -.macro CRITICAL_EXCEPTION_PROLOG name +.macro CRITICAL_EXCEPTION_PROLOG trapno name stw r10,crit_r10@l(0) /* save two registers to work with */ stw r11,crit_r11@l(0) mfspr r10,SPRN_SRR0 @@ -161,6 +161,8 @@ _ENTRY(crit_esr) lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */ addi r10, r10, STACK_FRAME_REGS_MARKER@l stw r10, 8(r11) + li r10, \trapno + 2 + stw r10,_TRAP(r11) SAVE_4GPRS(3, r11) SAVE_2GPRS(7, r11) _ASM_NOKPROBE_SYMBOL(\name\()_virt) @@ -184,7 +186,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) */ #define CRITICAL_EXCEPTION(n, label, hdlr) \ START_EXCEPTION(n, label); \ - CRITICAL_EXCEPTION_PROLOG label; \ + CRITICAL_EXCEPTION_PROLOG n label; \ EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \ crit_transfer_to_handler, ret_from_crit_exc) @@ -206,7 +208,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) * if they can't resolve the lightweight TLB fault. */ START_EXCEPTION(0x0300, DataStorage) - EXCEPTION_PROLOG DataStorage handle_dar_dsisr=1 + EXCEPTION_PROLOG 0x300 DataStorage handle_dar_dsisr=1 EXC_XFER_LITE(0x300, do_page_fault) /* @@ -214,7 +216,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) * This is caused by a fetch from non-execute or guarded pages. */ START_EXCEPTION(0x0400, InstructionAccess) - EXCEPTION_PROLOG InstructionAccess + EXCEPTION_PROLOG 0x400 InstructionAccess li r5,0 stw r5, _ESR(r11) /* Zero ESR */ stw r12, _DEAR(r11) /* SRR0 as DEAR */ @@ -225,12 +227,12 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) /* 0x0600 - Alignment Exception */ START_EXCEPTION(0x0600, Alignment) - EXCEPTION_PROLOG Alignment handle_dar_dsisr=1 + EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1 EXC_XFER_STD(0x600, alignment_exception) /* 0x0700 - Program Exception */ START_EXCEPTION(0x0700, ProgramCheck) - EXCEPTION_PROLOG ProgramCheck handle_dar_dsisr=1 + EXCEPTION_PROLOG 0x700 ProgramCheck handle_dar_dsisr=1 EXC_XFER_STD(0x700, program_check_exception) EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD) @@ -449,7 +451,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) */ /* 0x2000 - Debug Exception */ START_EXCEPTION(0x2000, DebugTrap) - CRITICAL_EXCEPTION_PROLOG DebugTrap + CRITICAL_EXCEPTION_PROLOG 0x2000 DebugTrap /* * If this is a single step or branch-taken exception in an @@ -498,7 +500,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt) /* Programmable Interval Timer (PIT) Exception. (from 0x1000) */ __HEAD Decrementer: - EXCEPTION_PROLOG Decrementer + EXCEPTION_PROLOG 0x1000 Decrementer lis r0,TSR_PIS@h mtspr SPRN_TSR,r0 /* Clear the PIT exception */ EXC_XFER_LITE(0x1000, timer_interrupt) @@ -506,13 +508,13 @@ Decrementer: /* Fixed Interval Timer (FIT) Exception. (from 0x1010) */ __HEAD FITException: - EXCEPTION_PROLOG FITException + EXCEPTION_PROLOG 0x1010 FITException EXC_XFER_STD(0x1010, unknown_exception) /* Watchdog Timer (WDT) Exception. (from 0x1020) */ __HEAD WDTException: - CRITICAL_EXCEPTION_PROLOG WDTException + CRITICAL_EXCEPTION_PROLOG 0x1020 WDTException EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), crit_transfer_to_handler, ret_from_crit_exc) |