diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 516 |
1 files changed, 0 insertions, 516 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 03727308d8cc..15720f8661a1 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -32,7 +32,6 @@ #include <asm/irqflags.h> #include <asm/hw_irq.h> #include <asm/context_tracking.h> -#include <asm/tm.h> #include <asm/ppc-opcode.h> #include <asm/barrier.h> #include <asm/export.h> @@ -48,372 +47,7 @@ /* * System calls. */ - .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 - -/* This value is used to mark exception frames on the stack. */ -exception_marker: - .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER - .section ".text" - .align 7 - -#ifdef CONFIG_PPC_BOOK3S -.macro system_call_vectored name trapnr - .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 .Ltabort_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 r12,_MSR(r1) - std r0,GPR0(r1) - std r10,GPR1(r1) - std r2,GPR2(r1) - ld r2,PACATOC(r13) - 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) - /* Zero r9-r12, this should only be required when restoring all GPRs */ - std r11,GPR9(r1) - std r11,GPR10(r1) - std r11,GPR11(r1) - std r11,GPR12(r1) - 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 */ - -BEGIN_FTR_SECTION - HMT_MEDIUM -END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) - - /* - * scv enters with MSR[EE]=1 and is immediately considered soft-masked. - * The entry vector already sets PACAIRQSOFTMASK to IRQS_ALL_DISABLED, - * and interrupts may be masked and pending already. - * system_call_exception() will call trace_hardirqs_off() which means - * interrupts could already have been blocked before trace_hardirqs_off, - * but this is the best we can do. - */ - - /* Calling convention has r9 = orig r0, r10 = regs */ - mr r9,r0 - bl system_call_exception - -.Lsyscall_vectored_\name\()_exit: - addi r4,r1,STACK_FRAME_OVERHEAD - li r5,1 /* scv */ - bl syscall_exit_prepare - - ld r2,_CCR(r1) - ld r4,_NIP(r1) - ld r5,_MSR(r1) - -BEGIN_FTR_SECTION - stdcx. r0,0,r1 /* to clear the reservation */ -END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) - -BEGIN_FTR_SECTION - HMT_MEDIUM_LOW -END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) - - cmpdi r3,0 - bne .Lsyscall_vectored_\name\()_restore_regs - - /* rfscv returns with LR->NIA and CTR->MSR */ - mtlr r4 - mtctr r5 - - /* 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) - /* Zero volatile regs that may contain sensitive kernel data */ - li r9,0 - li r10,0 - li r11,0 - li r12,0 - mtspr SPRN_XER,r0 - - /* - * We don't need to restore AMR on the way back to userspace for KUAP. - * 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) - RFSCV_TO_USER - b . /* prevent speculative execution */ - -.Lsyscall_vectored_\name\()_restore_regs: - li r3,0 - mtmsrd r3,1 - mtspr SPRN_SRR0,r4 - mtspr SPRN_SRR1,r5 - - ld r3,_CTR(r1) - ld r4,_LINK(r1) - ld r5,_XER(r1) - - REST_NVGPRS(r1) - ld r0,GPR0(r1) - mtcr r2 - mtctr r3 - mtlr r4 - mtspr SPRN_XER,r5 - REST_10GPRS(2, r1) - REST_2GPRS(12, r1) - ld r1,GPR1(r1) - RFI_TO_USER -.endm - -system_call_vectored common 0x3000 -/* - * We instantiate another entry copy for the SIGILL variant, with TRAP=0x7ff0 - * which is tested by system_call_exception when r0 is -1 (as set by vector - * entry code). - */ -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 - - .balign IFETCH_ALIGN_BYTES - .globl system_call_common_real -system_call_common_real: - ld r10,PACAKMSR(r13) /* get MSR value for kernel */ - mtmsrd r10 - - .balign IFETCH_ALIGN_BYTES - .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 .Ltabort_syscall -END_FTR_SECTION_IFSET(CPU_FTR_TM) -#endif - mr r10,r1 - ld r1,PACAKSAVE(r13) - std r10,0(r1) - std r11,_NIP(r1) - std r12,_MSR(r1) - std r0,GPR0(r1) - std r10,GPR1(r1) - std r2,GPR2(r1) -#ifdef CONFIG_PPC_FSL_BOOK3E -START_BTB_FLUSH_SECTION - BTB_FLUSH(r10) -END_BTB_FLUSH_SECTION -#endif - ld r2,PACATOC(r13) - 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) - /* Zero r9-r12, this should only be required when restoring all GPRs */ - std r11,GPR9(r1) - std r11,GPR10(r1) - std r11,GPR11(r1) - std r11,GPR12(r1) - std r9,GPR13(r1) - SAVE_NVGPRS(r1) - std r11,_XER(r1) - std r11,_CTR(r1) - mflr r10 - - /* - * This clears CR0.SO (bit 28), which is the error indication on - * return from this system call. - */ - rldimi r12,r11,28,(63-28) - li r11,0xc00 - 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 */ - - /* - * We always enter kernel from userspace with irq soft-mask enabled and - * nothing pending. system_call_exception() will call - * trace_hardirqs_off(). - */ - li r11,IRQS_ALL_DISABLED - li r12,PACA_IRQ_HARD_DIS - stb r11,PACAIRQSOFTMASK(r13) - stb r12,PACAIRQHAPPENED(r13) - - /* Calling convention has r9 = orig r0, r10 = regs */ - mr r9,r0 - bl system_call_exception - -.Lsyscall_exit: - addi r4,r1,STACK_FRAME_OVERHEAD - li r5,0 /* !scv */ - bl syscall_exit_prepare - - ld r2,_CCR(r1) - ld r4,_NIP(r1) - ld r5,_MSR(r1) - ld r6,_LINK(r1) - -BEGIN_FTR_SECTION - stdcx. r0,0,r1 /* to clear the reservation */ -END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) - - mtspr SPRN_SRR0,r4 - mtspr SPRN_SRR1,r5 - mtlr r6 - - 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 - mtctr r0 - mtspr SPRN_XER,r0 -.Lsyscall_restore_regs_cont: - -BEGIN_FTR_SECTION - HMT_MEDIUM_LOW -END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) - - /* - * We don't need to restore AMR on the way back to userspace for KUAP. - * 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) - RFI_TO_USER - b . /* prevent speculative execution */ - -.Lsyscall_restore_regs: - ld r3,_CTR(r1) - ld r4,_XER(r1) - REST_NVGPRS(r1) - mtctr r3 - mtspr SPRN_XER,r4 - ld r0,GPR0(r1) - REST_8GPRS(4, r1) - ld r12,GPR12(r1) - b .Lsyscall_restore_regs_cont - -#ifdef CONFIG_PPC_TRANSACTIONAL_MEM -.Ltabort_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 - -#ifdef CONFIG_PPC_BOOK3S -_GLOBAL(ret_from_fork_scv) - bl schedule_tail - REST_NVGPRS(r1) - li r3,0 /* fork() return value */ - b .Lsyscall_vectored_common_exit -#endif - -_GLOBAL(ret_from_fork) - bl schedule_tail - REST_NVGPRS(r1) - li r3,0 /* fork() return value */ - b .Lsyscall_exit - -_GLOBAL(ret_from_kernel_thread) - bl schedule_tail - REST_NVGPRS(r1) - mtctr r14 - mr r3,r15 -#ifdef PPC64_ELF_ABI_v2 - mr r12,r14 -#endif - bctrl - li r3,0 - b .Lsyscall_exit #ifdef CONFIG_PPC_BOOK3S_64 @@ -630,156 +264,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S) addi r1,r1,SWITCH_FRAME_SIZE blr - /* - * If MSR EE/RI was never enabled, IRQs not reconciled, NVGPRs not - * touched, no exit work created, then this can be used. - */ - .balign IFETCH_ALIGN_BYTES - .globl fast_interrupt_return -fast_interrupt_return: -_ASM_NOKPROBE_SYMBOL(fast_interrupt_return) - kuap_check_amr r3, r4 - ld r5,_MSR(r1) - andi. r0,r5,MSR_PR -#ifdef CONFIG_PPC_BOOK3S - bne .Lfast_user_interrupt_return_amr - kuap_kernel_restore r3, r4 - andi. r0,r5,MSR_RI - li r3,0 /* 0 return value, no EMULATE_STACK_STORE */ - bne+ .Lfast_kernel_interrupt_return - addi r3,r1,STACK_FRAME_OVERHEAD - bl unrecoverable_exception - b . /* should not get here */ -#else - bne .Lfast_user_interrupt_return - b .Lfast_kernel_interrupt_return -#endif - - .balign IFETCH_ALIGN_BYTES - .globl interrupt_return -interrupt_return: -_ASM_NOKPROBE_SYMBOL(interrupt_return) - ld r4,_MSR(r1) - andi. r0,r4,MSR_PR - beq .Lkernel_interrupt_return - addi r3,r1,STACK_FRAME_OVERHEAD - bl interrupt_exit_user_prepare - cmpdi r3,0 - bne- .Lrestore_nvgprs - -#ifdef CONFIG_PPC_BOOK3S -.Lfast_user_interrupt_return_amr: - kuap_user_restore r3, r4 -#endif -.Lfast_user_interrupt_return: - ld r11,_NIP(r1) - ld r12,_MSR(r1) -BEGIN_FTR_SECTION - ld r10,_PPR(r1) - mtspr SPRN_PPR,r10 -END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) - mtspr SPRN_SRR0,r11 - mtspr SPRN_SRR1,r12 - -BEGIN_FTR_SECTION - stdcx. r0,0,r1 /* to clear the reservation */ -FTR_SECTION_ELSE - ldarx r0,0,r1 -ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) - - ld r3,_CCR(r1) - ld r4,_LINK(r1) - ld r5,_CTR(r1) - ld r6,_XER(r1) - li r0,0 - - REST_4GPRS(7, r1) - REST_2GPRS(11, r1) - REST_GPR(13, r1) - - mtcr r3 - mtlr r4 - mtctr r5 - mtspr SPRN_XER,r6 - - REST_4GPRS(2, r1) - REST_GPR(6, r1) - REST_GPR(0, r1) - REST_GPR(1, r1) - RFI_TO_USER - b . /* prevent speculative execution */ - -.Lrestore_nvgprs: - REST_NVGPRS(r1) - b .Lfast_user_interrupt_return - - .balign IFETCH_ALIGN_BYTES -.Lkernel_interrupt_return: - addi r3,r1,STACK_FRAME_OVERHEAD - bl interrupt_exit_kernel_prepare - -.Lfast_kernel_interrupt_return: - cmpdi cr1,r3,0 - ld r11,_NIP(r1) - ld r12,_MSR(r1) - mtspr SPRN_SRR0,r11 - mtspr SPRN_SRR1,r12 - -BEGIN_FTR_SECTION - stdcx. r0,0,r1 /* to clear the reservation */ -FTR_SECTION_ELSE - ldarx r0,0,r1 -ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS) - - ld r3,_LINK(r1) - ld r4,_CTR(r1) - ld r5,_XER(r1) - ld r6,_CCR(r1) - li r0,0 - - REST_4GPRS(7, r1) - REST_2GPRS(11, r1) - - mtlr r3 - mtctr r4 - mtspr SPRN_XER,r5 - - /* - * Leaving a stale exception_marker on the stack can confuse - * the reliable stack unwinder later on. Clear it. - */ - std r0,STACK_FRAME_OVERHEAD-16(r1) - - REST_4GPRS(2, r1) - - bne- cr1,1f /* emulate stack store */ - mtcr r6 - REST_GPR(6, r1) - REST_GPR(0, r1) - REST_GPR(1, r1) - RFI_TO_KERNEL - b . /* prevent speculative execution */ - -1: /* - * Emulate stack store with update. New r1 value was already calculated - * and updated in our interrupt regs by emulate_loadstore, but we can't - * store the previous value of r1 to the stack before re-loading our - * registers from it, otherwise they could be clobbered. Use - * PACA_EXGEN as temporary storage to hold the store data, as - * interrupts are disabled here so it won't be clobbered. - */ - mtcr r6 - std r9,PACA_EXGEN+0(r13) - addi r9,r1,INT_FRAME_SIZE /* get original r1 */ - REST_GPR(6, r1) - REST_GPR(0, r1) - REST_GPR(1, r1) - std r9,0(r1) /* perform store component of stdu */ - ld r9,PACA_EXGEN+0(r13) - - RFI_TO_KERNEL - b . /* prevent speculative execution */ - #ifdef CONFIG_PPC_RTAS /* * On CHRP, the Run-Time Abstraction Services (RTAS) have to be |