mirror of https://gitee.com/openkylin/linux.git
powerpc/64s/exception: remove bad stack branch
The bad stack test in interrupt handlers has a few problems. For performance it is taken in the common case, which is a fetch bubble and a waste of i-cache. For code development and maintainence, it requires yet another stack frame setup routine, and that constrains all exception handlers to follow the same register save pattern which inhibits future optimisation. Remove the test/branch and replace it with a trap. Teach the program check handler to use the emergency stack for this case. This does not result in quite so nice a message, however the SRR0 and SRR1 of the crashed interrupt can be seen in r11 and r12, as is the original r1 (adjusted by INT_FRAME_SIZE). These are the most important parts to debugging the issue. The original r9-12 and cr0 is lost, which is the main downside. kernel BUG at linux/arch/powerpc/kernel/exceptions-64s.S:847! Oops: Exception in kernel mode, sig: 5 [#1] BE SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted NIP: c000000000009108 LR: c000000000cadbcc CTR: c0000000000090f0 REGS: c0000000fffcbd70 TRAP: 0700 Not tainted MSR: 9000000000021032 <SF,HV,ME,IR,DR,RI> CR: 28222448 XER: 20040000 CFAR: c000000000009100 IRQMASK: 0 GPR00: 000000000000003d fffffffffffffd00 c0000000018cfb00 c0000000f02b3166 GPR04: fffffffffffffffd 0000000000000007 fffffffffffffffb 0000000000000030 GPR08: 0000000000000037 0000000028222448 0000000000000000 c000000000ca8de0 GPR12: 9000000002009032 c000000001ae0000 c000000000010a00 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: c0000000f00322c0 c000000000f85200 0000000000000004 ffffffffffffffff GPR24: fffffffffffffffe 0000000000000000 0000000000000000 000000000000000a GPR28: 0000000000000000 0000000000000000 c0000000f02b391c c0000000f02b3167 NIP [c000000000009108] decrementer_common+0x18/0x160 LR [c000000000cadbcc] .vsnprintf+0x3ec/0x4f0 Call Trace: Instruction dump: 996d098a 994d098b 38610070 480246ed 48005518 60000000 38200000 718a4000 7c2a0b78 3821fd00 41c20008 e82d0970 <0981fd00> f92101a0 f9610170 f9810178 Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -48,13 +48,6 @@
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*/
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#define MAX_MCE_DEPTH 4
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/*
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* EX_R3 is only used by the bad_stack handler. bad_stack reloads and
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* saves DAR from SPRN_DAR, and EX_DAR is not used. So EX_R3 can overlap
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* with EX_DAR.
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*/
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#define EX_R3 EX_DAR
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#ifdef __ASSEMBLY__
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#define STF_ENTRY_BARRIER_SLOT \
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@ -170,7 +170,9 @@ struct paca_struct {
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u64 kstack; /* Saved Kernel stack addr */
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u64 saved_r1; /* r1 save for RTAS calls or PM or EE=0 */
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u64 saved_msr; /* MSR saved here by enter_rtas */
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#ifdef CONFIG_PPC_BOOK3E
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u16 trap_save; /* Used when bad stack is encountered */
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#endif
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u8 irq_soft_mask; /* mask for irq soft masking */
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u8 irq_happened; /* irq happened while soft-disabled */
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u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
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@ -270,7 +270,9 @@ int main(void)
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OFFSET(ACCOUNT_STARTTIME_USER, paca_struct, accounting.starttime_user);
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OFFSET(ACCOUNT_USER_TIME, paca_struct, accounting.utime);
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OFFSET(ACCOUNT_SYSTEM_TIME, paca_struct, accounting.stime);
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#ifdef CONFIG_PPC_BOOK3E
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OFFSET(PACA_TRAP_SAVE, paca_struct, trap_save);
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#endif
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OFFSET(PACA_SPRG_VDSO, paca_struct, sprg_vdso);
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#else /* CONFIG_PPC64 */
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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@ -411,14 +411,8 @@ END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
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subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
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beq- 1f; \
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ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
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1: cmpdi cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace */ \
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blt+ cr1,3f; /* abort if it is */ \
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li r1,(trap); /* will be reloaded later */ \
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sth r1,PACA_TRAP_SAVE(r13); \
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std r3,area+EX_R3(r13); \
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addi r3,r13,area; /* r3 -> where regs are saved*/ \
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RESTORE_CTR(r1, area); \
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b bad_stack; \
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1: tdgei r1,-INT_FRAME_SIZE; /* trap if r1 is in userspace */ \
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EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0; \
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3: EXCEPTION_PROLOG_COMMON_1(); \
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kuap_save_amr_and_lock r9, r10, cr1, cr0; \
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beq 4f; /* if from kernel mode */ \
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@ -428,7 +422,6 @@ END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
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EXCEPTION_PROLOG_COMMON_3(trap); \
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ACCOUNT_STOLEN_TIME
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/*
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* Exception where stack is already set in r1, r1 is saved in r10.
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* PPR save and CPU accounting is not done (for some reason).
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@ -1453,21 +1446,25 @@ EXC_COMMON_BEGIN(program_check_common)
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* we switch to the emergency stack if we're taking a TM Bad Thing from
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* the kernel.
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*/
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li r10,MSR_PR /* Build a mask of MSR_PR .. */
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oris r10,r10,0x200000@h /* .. and SRR1_PROGTM */
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and r10,r10,r12 /* Mask SRR1 with that. */
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srdi r10,r10,8 /* Shift it so we can compare */
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cmpldi r10,(0x200000 >> 8) /* .. with an immediate. */
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bne 1f /* If != go to normal path. */
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/* SRR1 had PR=0 and SRR1_PROGTM=1, so use the emergency stack */
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andi. r10,r12,MSR_PR; /* Set CR0 correctly for label */
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andi. r10,r12,MSR_PR
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bne 2f /* If userspace, go normal path */
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andis. r10,r12,(SRR1_PROGTM)@h
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bne 1f /* If TM, emergency */
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cmpdi r1,-INT_FRAME_SIZE /* check if r1 is in userspace */
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blt 2f /* normal path if not */
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/* Use the emergency stack */
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1: andi. r10,r12,MSR_PR /* Set CR0 correctly for label */
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/* 3 in EXCEPTION_PROLOG_COMMON */
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mr r10,r1 /* Save r1 */
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ld r1,PACAEMERGSP(r13) /* Use emergency stack */
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subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
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b 3f /* Jump into the macro !! */
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1: EXCEPTION_COMMON(PACA_EXGEN, 0x700)
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2:
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EXCEPTION_COMMON(PACA_EXGEN, 0x700)
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bl save_nvgprs
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RECONCILE_IRQ_STATE(r10, r11)
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addi r3,r1,STACK_FRAME_OVERHEAD
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@ -2408,67 +2405,6 @@ handle_dabr_fault:
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bl bad_page_fault
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b ret_from_except
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/*
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* Here we have detected that the kernel stack pointer is bad.
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* R9 contains the saved CR, r13 points to the paca,
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* r10 contains the (bad) kernel stack pointer,
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* r11 and r12 contain the saved SRR0 and SRR1.
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* We switch to using an emergency stack, save the registers there,
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* and call kernel_bad_stack(), which panics.
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*/
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bad_stack:
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ld r1,PACAEMERGSP(r13)
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subi r1,r1,64+INT_FRAME_SIZE
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std r9,_CCR(r1)
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std r10,GPR1(r1)
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std r11,_NIP(r1)
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std r12,_MSR(r1)
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mfspr r11,SPRN_DAR
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mfspr r12,SPRN_DSISR
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std r11,_DAR(r1)
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std r12,_DSISR(r1)
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mflr r10
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mfctr r11
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mfxer r12
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std r10,_LINK(r1)
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std r11,_CTR(r1)
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std r12,_XER(r1)
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SAVE_GPR(0,r1)
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SAVE_GPR(2,r1)
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ld r10,EX_R3(r3)
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std r10,GPR3(r1)
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SAVE_GPR(4,r1)
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SAVE_4GPRS(5,r1)
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ld r9,EX_R9(r3)
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ld r10,EX_R10(r3)
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SAVE_2GPRS(9,r1)
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ld r9,EX_R11(r3)
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ld r10,EX_R12(r3)
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ld r11,EX_R13(r3)
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std r9,GPR11(r1)
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std r10,GPR12(r1)
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std r11,GPR13(r1)
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BEGIN_FTR_SECTION
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ld r10,EX_CFAR(r3)
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std r10,ORIG_GPR3(r1)
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END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
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SAVE_8GPRS(14,r1)
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SAVE_10GPRS(22,r1)
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lhz r12,PACA_TRAP_SAVE(r13)
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std r12,_TRAP(r1)
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addi r11,r1,INT_FRAME_SIZE
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std r11,0(r1)
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li r12,0
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std r12,0(r11)
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ld r2,PACATOC(r13)
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ld r11,exception_marker@toc(r2)
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std r12,RESULT(r1)
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std r11,STACK_FRAME_OVERHEAD-16(r1)
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1: addi r3,r1,STACK_FRAME_OVERHEAD
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bl kernel_bad_stack
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b 1b
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_ASM_NOKPROBE_SYMBOL(bad_stack);
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/*
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* When doorbell is triggered from system reset wakeup, the message is
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* not cleared, so it would fire again when EE is enabled.
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@ -2454,7 +2454,9 @@ static void dump_one_paca(int cpu)
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DUMP(p, canary, "%#-*lx");
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#endif
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DUMP(p, saved_r1, "%#-*llx");
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#ifdef CONFIG_PPC_BOOK3E
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DUMP(p, trap_save, "%#-*x");
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#endif
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DUMP(p, irq_soft_mask, "%#-*x");
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DUMP(p, irq_happened, "%#-*x");
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#ifdef CONFIG_MMIOWB
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