diff options
Diffstat (limited to 'arch/powerpc/kernel/interrupt_64.S')
| -rw-r--r-- | arch/powerpc/kernel/interrupt_64.S | 352 |
1 files changed, 175 insertions, 177 deletions
diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S index d4212d2ff0b5..1ad059a9e2fe 100644 --- a/arch/powerpc/kernel/interrupt_64.S +++ b/arch/powerpc/kernel/interrupt_64.S @@ -12,17 +12,6 @@ #include <asm/mmu.h> #include <asm/ppc_asm.h> #include <asm/ptrace.h> -#include <asm/tm.h> - - .section ".toc","aw" -SYS_CALL_TABLE: - .tc sys_call_table[TC],sys_call_table - -#ifdef CONFIG_COMPAT -COMPAT_SYS_CALL_TABLE: - .tc compat_sys_call_table[TC],compat_sys_call_table -#endif - .previous .align 7 @@ -31,21 +20,25 @@ COMPAT_SYS_CALL_TABLE: .ifc \srr,srr mfspr r11,SPRN_SRR0 ld r12,_NIP(r1) + clrrdi r11,r11,2 + clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_SRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .else mfspr r11,SPRN_HSRR0 ld r12,_NIP(r1) + clrrdi r11,r11,2 + clrrdi r12,r12,2 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) mfspr r11,SPRN_HSRR1 ld r12,_MSR(r1) 100: tdne r11,r12 - EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) + EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE) .endif #endif .endm @@ -55,31 +48,21 @@ COMPAT_SYS_CALL_TABLE: .globl system_call_vectored_\name system_call_vectored_\name: _ASM_NOKPROBE_SYMBOL(system_call_vectored_\name) -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM -BEGIN_FTR_SECTION - extrdi. r10, r12, 1, (63-MSR_TS_T_LG) /* transaction active? */ - bne tabort_syscall -END_FTR_SECTION_IFSET(CPU_FTR_TM) -#endif SCV_INTERRUPT_TO_KERNEL mr r10,r1 ld r1,PACAKSAVE(r13) std r10,0(r1) - std r11,_NIP(r1) + std r11,_LINK(r1) + std r11,_NIP(r1) /* Saved LR is also the next instruction */ std r12,_MSR(r1) std r0,GPR0(r1) std r10,GPR1(r1) std r2,GPR2(r1) - ld r2,PACATOC(r13) + LOAD_PACA_TOC() mfcr r12 li r11,0 - /* Can we avoid saving r3-r8 in common case? */ - std r3,GPR3(r1) - std r4,GPR4(r1) - std r5,GPR5(r1) - std r6,GPR6(r1) - std r7,GPR7(r1) - std r8,GPR8(r1) + /* Save syscall parameters in r3-r8 */ + SAVE_GPRS(3, 8, r1) /* Zero r9-r12, this should only be required when restoring all GPRs */ std r11,GPR9(r1) std r11,GPR10(r1) @@ -88,15 +71,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM) std r9,GPR13(r1) SAVE_NVGPRS(r1) std r11,_XER(r1) - std r11,_LINK(r1) std r11,_CTR(r1) li r11,\trapnr std r11,_TRAP(r1) std r12,_CCR(r1) - addi r10,r1,STACK_FRAME_OVERHEAD - ld r11,exception_marker@toc(r2) - std r11,-16(r10) /* "regshere" marker */ + std r3,ORIG_GPR3(r1) + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) + std r11,STACK_INT_FRAME_MARKER(r1) /* "regs" marker */ + /* Calling convention has r3 = regs, r4 = orig r0 */ + addi r3,r1,STACK_INT_FRAME_REGS + mr r4,r0 BEGIN_FTR_SECTION HMT_MEDIUM @@ -111,14 +96,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) * but this is the best we can do. */ - /* Calling convention has r9 = orig r0, r10 = regs */ - mr r9,r0 - bl system_call_exception + /* + * Zero user registers to prevent influencing speculative execution + * state of kernel code. + */ + SANITIZE_SYSCALL_GPRS() + bl CFUNC(system_call_exception) .Lsyscall_vectored_\name\()_exit: - addi r4,r1,STACK_FRAME_OVERHEAD + addi r4,r1,STACK_INT_FRAME_REGS li r5,1 /* scv */ - bl syscall_exit_prepare + bl CFUNC(syscall_exit_prepare) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ .Lsyscall_vectored_\name\()_rst_start: lbz r11,PACAIRQHAPPENED(r13) @@ -141,6 +129,7 @@ BEGIN_FTR_SECTION HMT_MEDIUM_LOW END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) + SANITIZE_RESTORE_NVGPRS() cmpdi r3,0 bne .Lsyscall_vectored_\name\()_restore_regs @@ -151,17 +140,10 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) /* Could zero these as per ABI, but we may consider a stricter ABI * which preserves these if libc implementations can benefit, so * restore them for now until further measurement is done. */ - ld r0,GPR0(r1) - ld r4,GPR4(r1) - ld r5,GPR5(r1) - ld r6,GPR6(r1) - ld r7,GPR7(r1) - ld r8,GPR8(r1) + REST_GPR(0, r1) + REST_GPRS(4, 8, r1) /* Zero volatile regs that may contain sensitive kernel data */ - li r9,0 - li r10,0 - li r11,0 - li r12,0 + ZEROIZE_GPRS(9, 12) mtspr SPRN_XER,r0 /* @@ -169,10 +151,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) * The value of AMR only matters while we're in the kernel. */ mtcr r2 - ld r2,GPR2(r1) - ld r3,GPR3(r1) - ld r13,GPR13(r1) - ld r1,GPR1(r1) + REST_GPRS(2, 3, r1) + REST_GPR(13, r1) + REST_GPR(1, r1) RFSCV_TO_USER b . /* prevent speculative execution */ @@ -184,15 +165,14 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r4,_LINK(r1) ld r5,_XER(r1) - REST_NVGPRS(r1) - ld r0,GPR0(r1) + HANDLER_RESTORE_NVGPRS() + REST_GPR(0, r1) mtcr r2 mtctr r3 mtlr r4 mtspr SPRN_XER,r5 - REST_10GPRS(2, r1) - REST_2GPRS(12, r1) - ld r1,GPR1(r1) + REST_GPRS(2, 13, r1) + REST_GPR(1, r1) RFI_TO_USER .Lsyscall_vectored_\name\()_rst_end: @@ -200,12 +180,12 @@ syscall_vectored_\name\()_restart: _ASM_NOKPROBE_SYMBOL(syscall_vectored_\name\()_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) - ld r2,PACATOC(r13) + LOAD_PACA_TOC() ld r3,RESULT(r1) - addi r4,r1,STACK_FRAME_OVERHEAD + addi r4,r1,STACK_INT_FRAME_REGS li r11,IRQS_ALL_DISABLED stb r11,PACAIRQSOFTMASK(r13) - bl syscall_exit_restart + bl CFUNC(syscall_exit_restart) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ b .Lsyscall_vectored_\name\()_rst_start 1: @@ -224,16 +204,6 @@ system_call_vectored common 0x3000 */ system_call_vectored sigill 0x7ff0 - -/* - * Entered via kernel return set up by kernel/sstep.c, must match entry regs - */ - .globl system_call_vectored_emulate -system_call_vectored_emulate: -_ASM_NOKPROBE_SYMBOL(system_call_vectored_emulate) - li r10,IRQS_ALL_DISABLED - stb r10,PACAIRQSOFTMASK(r13) - b system_call_vectored_common #endif /* CONFIG_PPC_BOOK3S */ .balign IFETCH_ALIGN_BYTES @@ -247,12 +217,6 @@ _ASM_NOKPROBE_SYMBOL(system_call_common_real) .globl system_call_common system_call_common: _ASM_NOKPROBE_SYMBOL(system_call_common) -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM -BEGIN_FTR_SECTION - extrdi. r10, r12, 1, (63-MSR_TS_T_LG) /* transaction active? */ - bne tabort_syscall -END_FTR_SECTION_IFSET(CPU_FTR_TM) -#endif mr r10,r1 ld r1,PACAKSAVE(r13) std r10,0(r1) @@ -261,21 +225,16 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM) std r0,GPR0(r1) std r10,GPR1(r1) std r2,GPR2(r1) -#ifdef CONFIG_PPC_FSL_BOOK3E +#ifdef CONFIG_PPC_E500 START_BTB_FLUSH_SECTION BTB_FLUSH(r10) END_BTB_FLUSH_SECTION #endif - ld r2,PACATOC(r13) + LOAD_PACA_TOC() mfcr r12 li r11,0 - /* Can we avoid saving r3-r8 in common case? */ - std r3,GPR3(r1) - std r4,GPR4(r1) - std r5,GPR5(r1) - std r6,GPR6(r1) - std r7,GPR7(r1) - std r8,GPR8(r1) + /* Save syscall parameters in r3-r8 */ + SAVE_GPRS(3, 8, r1) /* Zero r9-r12, this should only be required when restoring all GPRs */ std r11,GPR9(r1) std r11,GPR10(r1) @@ -296,9 +255,12 @@ END_BTB_FLUSH_SECTION std r10,_LINK(r1) std r11,_TRAP(r1) std r12,_CCR(r1) - addi r10,r1,STACK_FRAME_OVERHEAD - ld r11,exception_marker@toc(r2) - std r11,-16(r10) /* "regshere" marker */ + std r3,ORIG_GPR3(r1) + LOAD_REG_IMMEDIATE(r11, STACK_FRAME_REGS_MARKER) + std r11,STACK_INT_FRAME_MARKER(r1) /* "regs" marker */ + /* Calling convention has r3 = regs, r4 = orig r0 */ + addi r3,r1,STACK_INT_FRAME_REGS + mr r4,r0 #ifdef CONFIG_PPC_BOOK3S li r11,1 @@ -319,14 +281,17 @@ END_BTB_FLUSH_SECTION wrteei 1 #endif - /* Calling convention has r9 = orig r0, r10 = regs */ - mr r9,r0 - bl system_call_exception + /* + * Zero user registers to prevent influencing speculative execution + * state of kernel code. + */ + SANITIZE_SYSCALL_GPRS() + bl CFUNC(system_call_exception) .Lsyscall_exit: - addi r4,r1,STACK_FRAME_OVERHEAD + addi r4,r1,STACK_INT_FRAME_REGS li r5,0 /* !scv */ - bl syscall_exit_prepare + bl CFUNC(syscall_exit_prepare) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ #ifdef CONFIG_PPC_BOOK3S .Lsyscall_rst_start: @@ -361,19 +326,12 @@ BEGIN_FTR_SECTION stdcx. r0,0,r1 /* to clear the reservation */ END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) + SANITIZE_RESTORE_NVGPRS() cmpdi r3,0 bne .Lsyscall_restore_regs /* Zero volatile regs that may contain sensitive kernel data */ - li r0,0 - li r4,0 - li r5,0 - li r6,0 - li r7,0 - li r8,0 - li r9,0 - li r10,0 - li r11,0 - li r12,0 + ZEROIZE_GPR(0) + ZEROIZE_GPRS(4, 12) mtctr r0 mtspr SPRN_XER,r0 .Lsyscall_restore_regs_cont: @@ -387,22 +345,20 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) * The value of AMR only matters while we're in the kernel. */ mtcr r2 - ld r2,GPR2(r1) - ld r3,GPR3(r1) - ld r13,GPR13(r1) - ld r1,GPR1(r1) + REST_GPRS(2, 3, r1) + REST_GPR(13, r1) + REST_GPR(1, r1) RFI_TO_USER b . /* prevent speculative execution */ .Lsyscall_restore_regs: ld r3,_CTR(r1) ld r4,_XER(r1) - REST_NVGPRS(r1) + HANDLER_RESTORE_NVGPRS() mtctr r3 mtspr SPRN_XER,r4 - ld r0,GPR0(r1) - REST_8GPRS(4, r1) - ld r12,GPR12(r1) + REST_GPR(0, r1) + REST_GPRS(4, 12, r1) b .Lsyscall_restore_regs_cont .Lsyscall_rst_end: @@ -411,12 +367,12 @@ syscall_restart: _ASM_NOKPROBE_SYMBOL(syscall_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) - ld r2,PACATOC(r13) + LOAD_PACA_TOC() ld r3,RESULT(r1) - addi r4,r1,STACK_FRAME_OVERHEAD + addi r4,r1,STACK_INT_FRAME_REGS li r11,IRQS_ALL_DISABLED stb r11,PACAIRQSOFTMASK(r13) - bl syscall_exit_restart + bl CFUNC(syscall_exit_restart) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ b .Lsyscall_rst_start 1: @@ -425,34 +381,6 @@ SOFT_MASK_TABLE(.Lsyscall_rst_start, 1b) RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart) #endif -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM -tabort_syscall: -_ASM_NOKPROBE_SYMBOL(tabort_syscall) - /* Firstly we need to enable TM in the kernel */ - mfmsr r10 - li r9, 1 - rldimi r10, r9, MSR_TM_LG, 63-MSR_TM_LG - mtmsrd r10, 0 - - /* tabort, this dooms the transaction, nothing else */ - li r9, (TM_CAUSE_SYSCALL|TM_CAUSE_PERSISTENT) - TABORT(R9) - - /* - * Return directly to userspace. We have corrupted user register state, - * but userspace will never see that register state. Execution will - * resume after the tbegin of the aborted transaction with the - * checkpointed register state. - */ - li r9, MSR_RI - andc r10, r10, r9 - mtmsrd r10, 1 - mtspr SPRN_SRR0, r11 - mtspr SPRN_SRR1, r12 - RFI_TO_USER - b . /* prevent speculative execution */ -#endif - /* * If MSR EE/RI was never enabled, IRQs not reconciled, NVGPRs not * touched, no exit work created, then this can be used. @@ -472,8 +400,8 @@ _ASM_NOKPROBE_SYMBOL(fast_interrupt_return_srr) andi. r0,r5,MSR_RI li r3,0 /* 0 return value, no EMULATE_STACK_STORE */ bne+ .Lfast_kernel_interrupt_return_srr - addi r3,r1,STACK_FRAME_OVERHEAD - bl unrecoverable_exception + addi r3,r1,STACK_INT_FRAME_REGS + bl CFUNC(unrecoverable_exception) b . /* should not get here */ #else bne .Lfast_user_interrupt_return_srr @@ -490,11 +418,13 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()) beq interrupt_return_\srr\()_kernel interrupt_return_\srr\()_user: /* make backtraces match the _kernel variant */ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user) - addi r3,r1,STACK_FRAME_OVERHEAD - bl interrupt_exit_user_prepare + addi r3,r1,STACK_INT_FRAME_REGS + bl CFUNC(interrupt_exit_user_prepare) +#ifndef CONFIG_INTERRUPT_SANITIZE_REGISTERS cmpdi r3,0 bne- .Lrestore_nvgprs_\srr .Lrestore_nvgprs_\srr\()_cont: +#endif std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ #ifdef CONFIG_PPC_BOOK3S .Linterrupt_return_\srr\()_user_rst_start: @@ -508,6 +438,7 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user) stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS .Lfast_user_interrupt_return_\srr\(): + SANITIZE_RESTORE_NVGPRS() #ifdef CONFIG_PPC_BOOK3S .ifc \srr,srr lbz r4,PACASRR_VALID(r13) @@ -559,17 +490,14 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) ld r6,_XER(r1) li r0,0 - REST_4GPRS(7, r1) - REST_2GPRS(11, r1) - REST_GPR(13, r1) + REST_GPRS(7, 13, r1) mtcr r3 mtlr r4 mtctr r5 mtspr SPRN_XER,r6 - REST_4GPRS(2, r1) - REST_GPR(6, r1) + REST_GPRS(2, 6, r1) REST_GPR(0, r1) REST_GPR(1, r1) .ifc \srr,srr @@ -580,20 +508,22 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) b . /* prevent speculative execution */ .Linterrupt_return_\srr\()_user_rst_end: +#ifndef CONFIG_INTERRUPT_SANITIZE_REGISTERS .Lrestore_nvgprs_\srr\(): REST_NVGPRS(r1) b .Lrestore_nvgprs_\srr\()_cont +#endif #ifdef CONFIG_PPC_BOOK3S interrupt_return_\srr\()_user_restart: _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) - ld r2,PACATOC(r13) - addi r3,r1,STACK_FRAME_OVERHEAD + LOAD_PACA_TOC() + addi r3,r1,STACK_INT_FRAME_REGS li r11,IRQS_ALL_DISABLED stb r11,PACAIRQSOFTMASK(r13) - bl interrupt_exit_user_restart + bl CFUNC(interrupt_exit_user_restart) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ b .Linterrupt_return_\srr\()_user_rst_start 1: @@ -605,25 +535,74 @@ RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr .balign IFETCH_ALIGN_BYTES interrupt_return_\srr\()_kernel: _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel) - addi r3,r1,STACK_FRAME_OVERHEAD - bl interrupt_exit_kernel_prepare + addi r3,r1,STACK_INT_FRAME_REGS + bl CFUNC(interrupt_exit_kernel_prepare) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ .Linterrupt_return_\srr\()_kernel_rst_start: ld r11,SOFTE(r1) cmpwi r11,IRQS_ENABLED stb r11,PACAIRQSOFTMASK(r13) - bne 1f + beq .Linterrupt_return_\srr\()_soft_enabled + + /* + * Returning to soft-disabled context. + * Check if a MUST_HARD_MASK interrupt has become pending, in which + * case we need to disable MSR[EE] in the return context. + * + * The MSR[EE] check catches among other things the short incoherency + * in hard_irq_disable() between clearing MSR[EE] and setting + * PACA_IRQ_HARD_DIS. + */ + ld r12,_MSR(r1) + andi. r10,r12,MSR_EE + beq .Lfast_kernel_interrupt_return_\srr\() // EE already disabled + lbz r11,PACAIRQHAPPENED(r13) + andi. r10,r11,PACA_IRQ_MUST_HARD_MASK + bne 1f // HARD_MASK is pending + // No HARD_MASK pending, clear possible HARD_DIS set by interrupt + andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l + stb r11,PACAIRQHAPPENED(r13) + b .Lfast_kernel_interrupt_return_\srr\() + + +1: /* Must clear MSR_EE from _MSR */ +#ifdef CONFIG_PPC_BOOK3S + li r10,0 + /* Clear valid before changing _MSR */ + .ifc \srr,srr + stb r10,PACASRR_VALID(r13) + .else + stb r10,PACAHSRR_VALID(r13) + .endif +#endif + xori r12,r12,MSR_EE + std r12,_MSR(r1) + b .Lfast_kernel_interrupt_return_\srr\() + +.Linterrupt_return_\srr\()_soft_enabled: + /* + * In the soft-enabled case, need to double-check that we have no + * pending interrupts that might have come in before we reached the + * restart section of code, and restart the exit so those can be + * handled. + * + * If there are none, it is be possible that the interrupt still + * has PACA_IRQ_HARD_DIS set, which needs to be cleared for the + * interrupted context. This clear will not clobber a new pending + * interrupt coming in, because we're in the restart section, so + * such would return to the restart location. + */ #ifdef CONFIG_PPC_BOOK3S lbz r11,PACAIRQHAPPENED(r13) andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l bne- interrupt_return_\srr\()_kernel_restart #endif li r11,0 - stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS -1: + stb r11,PACAIRQHAPPENED(r13) // clear the possible HARD_DIS .Lfast_kernel_interrupt_return_\srr\(): + SANITIZE_RESTORE_NVGPRS() cmpdi cr1,r3,0 #ifdef CONFIG_PPC_BOOK3S .ifc \srr,srr @@ -666,20 +645,19 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) ld r6,_CCR(r1) li r0,0 - REST_4GPRS(7, r1) - REST_2GPRS(11, r1) + REST_GPRS(7, 12, r1) mtlr r3 mtctr r4 mtspr SPRN_XER,r5 /* - * Leaving a stale exception_marker on the stack can confuse + * Leaving a stale STACK_FRAME_REGS_MARKER on the stack can confuse * the reliable stack unwinder later on. Clear it. */ - std r0,STACK_FRAME_OVERHEAD-16(r1) + std r0,STACK_INT_FRAME_MARKER(r1) - REST_4GPRS(2, r1) + REST_GPRS(2, 5, r1) bne- cr1,1f /* emulate stack store */ mtcr r6 @@ -723,11 +701,11 @@ interrupt_return_\srr\()_kernel_restart: _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_kernel_restart) GET_PACA(r13) ld r1,PACA_EXIT_SAVE_R1(r13) - ld r2,PACATOC(r13) - addi r3,r1,STACK_FRAME_OVERHEAD + LOAD_PACA_TOC() + addi r3,r1,STACK_INT_FRAME_REGS li r11,IRQS_ALL_DISABLED stb r11,PACAIRQSOFTMASK(r13) - bl interrupt_exit_kernel_restart + bl CFUNC(interrupt_exit_kernel_restart) std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */ b .Linterrupt_return_\srr\()_kernel_rst_start 1: @@ -744,31 +722,51 @@ interrupt_return_macro hsrr .globl __end_soft_masked __end_soft_masked: -DEFINE_FIXED_SYMBOL(__end_soft_masked) +DEFINE_FIXED_SYMBOL(__end_soft_masked, text) #endif /* CONFIG_PPC_BOOK3S */ #ifdef CONFIG_PPC_BOOK3S _GLOBAL(ret_from_fork_scv) - bl schedule_tail - REST_NVGPRS(r1) + bl CFUNC(schedule_tail) + HANDLER_RESTORE_NVGPRS() li r3,0 /* fork() return value */ b .Lsyscall_vectored_common_exit #endif _GLOBAL(ret_from_fork) - bl schedule_tail - REST_NVGPRS(r1) + bl CFUNC(schedule_tail) + HANDLER_RESTORE_NVGPRS() li r3,0 /* fork() return value */ b .Lsyscall_exit -_GLOBAL(ret_from_kernel_thread) - bl schedule_tail - REST_NVGPRS(r1) +_GLOBAL(ret_from_kernel_user_thread) + bl CFUNC(schedule_tail) mtctr r14 mr r3,r15 -#ifdef PPC64_ELF_ABI_v2 +#ifdef CONFIG_PPC64_ELF_ABI_V2 mr r12,r14 #endif bctrl li r3,0 + /* + * It does not matter whether this returns via the scv or sc path + * because it returns as execve() and therefore has no calling ABI + * (i.e., it sets registers according to the exec()ed entry point). + */ b .Lsyscall_exit + +_GLOBAL(start_kernel_thread) + bl CFUNC(schedule_tail) + mtctr r14 + mr r3,r15 +#ifdef CONFIG_PPC64_ELF_ABI_V2 + mr r12,r14 +#endif + bctrl + /* + * This must not return. We actually want to BUG here, not WARN, + * because BUG will exit the process which is what the kernel thread + * should have done, which may give some hope of continuing. + */ +100: trap + EMIT_BUG_ENTRY 100b,__FILE__,__LINE__,0 |