730 lines
16 KiB
ArmAsm
730 lines
16 KiB
ArmAsm
#include <asm/asm-offsets.h>
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#include <asm/bug.h>
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#ifdef CONFIG_PPC_BOOK3S
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#include <asm/exception-64s.h>
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#else
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#include <asm/exception-64e.h>
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#endif
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#include <asm/feature-fixups.h>
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#include <asm/head-64.h>
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#include <asm/hw_irq.h>
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#include <asm/kup.h>
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#include <asm/mmu.h>
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#include <asm/ppc_asm.h>
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#include <asm/ptrace.h>
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.section ".toc","aw"
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SYS_CALL_TABLE:
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.tc sys_call_table[TC],sys_call_table
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#ifdef CONFIG_COMPAT
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COMPAT_SYS_CALL_TABLE:
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.tc compat_sys_call_table[TC],compat_sys_call_table
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#endif
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.previous
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.align 7
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.macro DEBUG_SRR_VALID srr
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#ifdef CONFIG_PPC_RFI_SRR_DEBUG
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.ifc \srr,srr
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mfspr r11,SPRN_SRR0
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ld r12,_NIP(r1)
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clrrdi r11,r11,2
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clrrdi r12,r12,2
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100: tdne r11,r12
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EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE)
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mfspr r11,SPRN_SRR1
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ld r12,_MSR(r1)
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100: tdne r11,r12
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EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE)
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.else
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mfspr r11,SPRN_HSRR0
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ld r12,_NIP(r1)
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clrrdi r11,r11,2
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clrrdi r12,r12,2
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100: tdne r11,r12
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EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE)
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mfspr r11,SPRN_HSRR1
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ld r12,_MSR(r1)
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100: tdne r11,r12
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EMIT_WARN_ENTRY 100b,__FILE__,__LINE__,(BUGFLAG_WARNING | BUGFLAG_ONCE)
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.endif
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#endif
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.endm
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#ifdef CONFIG_PPC_BOOK3S
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.macro system_call_vectored name trapnr
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.globl system_call_vectored_\name
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system_call_vectored_\name:
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_ASM_NOKPROBE_SYMBOL(system_call_vectored_\name)
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SCV_INTERRUPT_TO_KERNEL
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mr r10,r1
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ld r1,PACAKSAVE(r13)
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std r10,0(r1)
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std r11,_NIP(r1)
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std r12,_MSR(r1)
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std r0,GPR0(r1)
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std r10,GPR1(r1)
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std r2,GPR2(r1)
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ld r2,PACATOC(r13)
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mfcr r12
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li r11,0
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/* Can we avoid saving r3-r8 in common case? */
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std r3,GPR3(r1)
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std r4,GPR4(r1)
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std r5,GPR5(r1)
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std r6,GPR6(r1)
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std r7,GPR7(r1)
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std r8,GPR8(r1)
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/* Zero r9-r12, this should only be required when restoring all GPRs */
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std r11,GPR9(r1)
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std r11,GPR10(r1)
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std r11,GPR11(r1)
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std r11,GPR12(r1)
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std r9,GPR13(r1)
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SAVE_NVGPRS(r1)
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std r11,_XER(r1)
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std r11,_LINK(r1)
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std r11,_CTR(r1)
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li r11,\trapnr
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std r11,_TRAP(r1)
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std r12,_CCR(r1)
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addi r10,r1,STACK_FRAME_OVERHEAD
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ld r11,exception_marker@toc(r2)
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std r11,-16(r10) /* "regshere" marker */
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BEGIN_FTR_SECTION
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HMT_MEDIUM
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END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
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/*
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* scv enters with MSR[EE]=1 and is immediately considered soft-masked.
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* The entry vector already sets PACAIRQSOFTMASK to IRQS_ALL_DISABLED,
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* and interrupts may be masked and pending already.
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* system_call_exception() will call trace_hardirqs_off() which means
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* interrupts could already have been blocked before trace_hardirqs_off,
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* but this is the best we can do.
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*/
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/* Calling convention has r9 = orig r0, r10 = regs */
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mr r9,r0
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bl system_call_exception
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.Lsyscall_vectored_\name\()_exit:
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addi r4,r1,STACK_FRAME_OVERHEAD
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li r5,1 /* scv */
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bl syscall_exit_prepare
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std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
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.Lsyscall_vectored_\name\()_rst_start:
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lbz r11,PACAIRQHAPPENED(r13)
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andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
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bne- syscall_vectored_\name\()_restart
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li r11,IRQS_ENABLED
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stb r11,PACAIRQSOFTMASK(r13)
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li r11,0
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stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
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ld r2,_CCR(r1)
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ld r4,_NIP(r1)
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ld r5,_MSR(r1)
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BEGIN_FTR_SECTION
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stdcx. r0,0,r1 /* to clear the reservation */
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END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
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BEGIN_FTR_SECTION
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HMT_MEDIUM_LOW
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END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
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cmpdi r3,0
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bne .Lsyscall_vectored_\name\()_restore_regs
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/* rfscv returns with LR->NIA and CTR->MSR */
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mtlr r4
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mtctr r5
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/* Could zero these as per ABI, but we may consider a stricter ABI
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* which preserves these if libc implementations can benefit, so
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* restore them for now until further measurement is done. */
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ld r0,GPR0(r1)
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ld r4,GPR4(r1)
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ld r5,GPR5(r1)
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ld r6,GPR6(r1)
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ld r7,GPR7(r1)
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ld r8,GPR8(r1)
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/* Zero volatile regs that may contain sensitive kernel data */
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li r9,0
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li r10,0
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li r11,0
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li r12,0
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mtspr SPRN_XER,r0
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/*
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* We don't need to restore AMR on the way back to userspace for KUAP.
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* The value of AMR only matters while we're in the kernel.
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*/
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mtcr r2
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REST_GPRS(2, 3, r1)
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REST_GPR(13, r1)
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REST_GPR(1, r1)
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RFSCV_TO_USER
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b . /* prevent speculative execution */
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.Lsyscall_vectored_\name\()_restore_regs:
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mtspr SPRN_SRR0,r4
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mtspr SPRN_SRR1,r5
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ld r3,_CTR(r1)
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ld r4,_LINK(r1)
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ld r5,_XER(r1)
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REST_NVGPRS(r1)
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ld r0,GPR0(r1)
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mtcr r2
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mtctr r3
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mtlr r4
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mtspr SPRN_XER,r5
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REST_GPRS(2, 13, r1)
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REST_GPR(1, r1)
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RFI_TO_USER
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.Lsyscall_vectored_\name\()_rst_end:
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syscall_vectored_\name\()_restart:
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_ASM_NOKPROBE_SYMBOL(syscall_vectored_\name\()_restart)
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GET_PACA(r13)
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ld r1,PACA_EXIT_SAVE_R1(r13)
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ld r2,PACATOC(r13)
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ld r3,RESULT(r1)
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addi r4,r1,STACK_FRAME_OVERHEAD
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li r11,IRQS_ALL_DISABLED
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stb r11,PACAIRQSOFTMASK(r13)
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bl syscall_exit_restart
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std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
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b .Lsyscall_vectored_\name\()_rst_start
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1:
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SOFT_MASK_TABLE(.Lsyscall_vectored_\name\()_rst_start, 1b)
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RESTART_TABLE(.Lsyscall_vectored_\name\()_rst_start, .Lsyscall_vectored_\name\()_rst_end, syscall_vectored_\name\()_restart)
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.endm
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system_call_vectored common 0x3000
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/*
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* We instantiate another entry copy for the SIGILL variant, with TRAP=0x7ff0
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* which is tested by system_call_exception when r0 is -1 (as set by vector
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* entry code).
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*/
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system_call_vectored sigill 0x7ff0
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/*
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* Entered via kernel return set up by kernel/sstep.c, must match entry regs
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*/
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.globl system_call_vectored_emulate
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system_call_vectored_emulate:
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_ASM_NOKPROBE_SYMBOL(system_call_vectored_emulate)
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li r10,IRQS_ALL_DISABLED
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stb r10,PACAIRQSOFTMASK(r13)
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b system_call_vectored_common
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#endif /* CONFIG_PPC_BOOK3S */
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.balign IFETCH_ALIGN_BYTES
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.globl system_call_common_real
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system_call_common_real:
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_ASM_NOKPROBE_SYMBOL(system_call_common_real)
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ld r10,PACAKMSR(r13) /* get MSR value for kernel */
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mtmsrd r10
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.balign IFETCH_ALIGN_BYTES
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.globl system_call_common
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system_call_common:
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_ASM_NOKPROBE_SYMBOL(system_call_common)
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mr r10,r1
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ld r1,PACAKSAVE(r13)
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std r10,0(r1)
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std r11,_NIP(r1)
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std r12,_MSR(r1)
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std r0,GPR0(r1)
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std r10,GPR1(r1)
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std r2,GPR2(r1)
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#ifdef CONFIG_PPC_FSL_BOOK3E
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START_BTB_FLUSH_SECTION
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BTB_FLUSH(r10)
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END_BTB_FLUSH_SECTION
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#endif
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ld r2,PACATOC(r13)
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mfcr r12
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li r11,0
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/* Can we avoid saving r3-r8 in common case? */
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std r3,GPR3(r1)
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std r4,GPR4(r1)
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std r5,GPR5(r1)
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std r6,GPR6(r1)
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std r7,GPR7(r1)
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std r8,GPR8(r1)
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/* Zero r9-r12, this should only be required when restoring all GPRs */
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std r11,GPR9(r1)
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std r11,GPR10(r1)
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std r11,GPR11(r1)
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std r11,GPR12(r1)
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std r9,GPR13(r1)
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SAVE_NVGPRS(r1)
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std r11,_XER(r1)
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std r11,_CTR(r1)
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mflr r10
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/*
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* This clears CR0.SO (bit 28), which is the error indication on
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* return from this system call.
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*/
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rldimi r12,r11,28,(63-28)
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li r11,0xc00
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std r10,_LINK(r1)
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std r11,_TRAP(r1)
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std r12,_CCR(r1)
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addi r10,r1,STACK_FRAME_OVERHEAD
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ld r11,exception_marker@toc(r2)
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std r11,-16(r10) /* "regshere" marker */
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#ifdef CONFIG_PPC_BOOK3S
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li r11,1
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stb r11,PACASRR_VALID(r13)
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#endif
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/*
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* We always enter kernel from userspace with irq soft-mask enabled and
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* nothing pending. system_call_exception() will call
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* trace_hardirqs_off().
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*/
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li r11,IRQS_ALL_DISABLED
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stb r11,PACAIRQSOFTMASK(r13)
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#ifdef CONFIG_PPC_BOOK3S
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li r12,-1 /* Set MSR_EE and MSR_RI */
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mtmsrd r12,1
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#else
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wrteei 1
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#endif
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/* Calling convention has r9 = orig r0, r10 = regs */
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mr r9,r0
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bl system_call_exception
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.Lsyscall_exit:
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addi r4,r1,STACK_FRAME_OVERHEAD
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li r5,0 /* !scv */
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bl syscall_exit_prepare
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std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
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#ifdef CONFIG_PPC_BOOK3S
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.Lsyscall_rst_start:
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lbz r11,PACAIRQHAPPENED(r13)
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andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
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bne- syscall_restart
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#endif
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li r11,IRQS_ENABLED
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stb r11,PACAIRQSOFTMASK(r13)
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li r11,0
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stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
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ld r2,_CCR(r1)
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ld r6,_LINK(r1)
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mtlr r6
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#ifdef CONFIG_PPC_BOOK3S
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lbz r4,PACASRR_VALID(r13)
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cmpdi r4,0
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bne 1f
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li r4,0
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stb r4,PACASRR_VALID(r13)
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#endif
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ld r4,_NIP(r1)
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ld r5,_MSR(r1)
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mtspr SPRN_SRR0,r4
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mtspr SPRN_SRR1,r5
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1:
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DEBUG_SRR_VALID srr
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BEGIN_FTR_SECTION
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stdcx. r0,0,r1 /* to clear the reservation */
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END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
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cmpdi r3,0
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bne .Lsyscall_restore_regs
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/* Zero volatile regs that may contain sensitive kernel data */
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li r0,0
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li r4,0
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li r5,0
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li r6,0
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li r7,0
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li r8,0
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li r9,0
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li r10,0
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li r11,0
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li r12,0
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mtctr r0
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mtspr SPRN_XER,r0
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.Lsyscall_restore_regs_cont:
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BEGIN_FTR_SECTION
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HMT_MEDIUM_LOW
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END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
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/*
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* We don't need to restore AMR on the way back to userspace for KUAP.
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* The value of AMR only matters while we're in the kernel.
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*/
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mtcr r2
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REST_GPRS(2, 3, r1)
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REST_GPR(13, r1)
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REST_GPR(1, r1)
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RFI_TO_USER
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b . /* prevent speculative execution */
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.Lsyscall_restore_regs:
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ld r3,_CTR(r1)
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ld r4,_XER(r1)
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REST_NVGPRS(r1)
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mtctr r3
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mtspr SPRN_XER,r4
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ld r0,GPR0(r1)
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REST_GPRS(4, 12, r1)
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b .Lsyscall_restore_regs_cont
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.Lsyscall_rst_end:
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#ifdef CONFIG_PPC_BOOK3S
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syscall_restart:
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_ASM_NOKPROBE_SYMBOL(syscall_restart)
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GET_PACA(r13)
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ld r1,PACA_EXIT_SAVE_R1(r13)
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ld r2,PACATOC(r13)
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ld r3,RESULT(r1)
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addi r4,r1,STACK_FRAME_OVERHEAD
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li r11,IRQS_ALL_DISABLED
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stb r11,PACAIRQSOFTMASK(r13)
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bl syscall_exit_restart
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std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
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b .Lsyscall_rst_start
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1:
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SOFT_MASK_TABLE(.Lsyscall_rst_start, 1b)
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RESTART_TABLE(.Lsyscall_rst_start, .Lsyscall_rst_end, syscall_restart)
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#endif
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/*
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* If MSR EE/RI was never enabled, IRQs not reconciled, NVGPRs not
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* touched, no exit work created, then this can be used.
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*/
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.balign IFETCH_ALIGN_BYTES
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.globl fast_interrupt_return_srr
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fast_interrupt_return_srr:
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_ASM_NOKPROBE_SYMBOL(fast_interrupt_return_srr)
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kuap_check_amr r3, r4
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ld r5,_MSR(r1)
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andi. r0,r5,MSR_PR
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#ifdef CONFIG_PPC_BOOK3S
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beq 1f
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kuap_user_restore r3, r4
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b .Lfast_user_interrupt_return_srr
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1: kuap_kernel_restore r3, r4
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andi. r0,r5,MSR_RI
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li r3,0 /* 0 return value, no EMULATE_STACK_STORE */
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bne+ .Lfast_kernel_interrupt_return_srr
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addi r3,r1,STACK_FRAME_OVERHEAD
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bl unrecoverable_exception
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b . /* should not get here */
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#else
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bne .Lfast_user_interrupt_return_srr
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b .Lfast_kernel_interrupt_return_srr
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#endif
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.macro interrupt_return_macro srr
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.balign IFETCH_ALIGN_BYTES
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.globl interrupt_return_\srr
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interrupt_return_\srr\():
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_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\())
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ld r4,_MSR(r1)
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andi. r0,r4,MSR_PR
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beq interrupt_return_\srr\()_kernel
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interrupt_return_\srr\()_user: /* make backtraces match the _kernel variant */
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_ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user)
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addi r3,r1,STACK_FRAME_OVERHEAD
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bl interrupt_exit_user_prepare
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cmpdi r3,0
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bne- .Lrestore_nvgprs_\srr
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.Lrestore_nvgprs_\srr\()_cont:
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std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
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#ifdef CONFIG_PPC_BOOK3S
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.Linterrupt_return_\srr\()_user_rst_start:
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lbz r11,PACAIRQHAPPENED(r13)
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andi. r11,r11,(~PACA_IRQ_HARD_DIS)@l
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bne- interrupt_return_\srr\()_user_restart
|
|
#endif
|
|
li r11,IRQS_ENABLED
|
|
stb r11,PACAIRQSOFTMASK(r13)
|
|
li r11,0
|
|
stb r11,PACAIRQHAPPENED(r13) # clear out possible HARD_DIS
|
|
|
|
.Lfast_user_interrupt_return_\srr\():
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
.ifc \srr,srr
|
|
lbz r4,PACASRR_VALID(r13)
|
|
.else
|
|
lbz r4,PACAHSRR_VALID(r13)
|
|
.endif
|
|
cmpdi r4,0
|
|
li r4,0
|
|
bne 1f
|
|
#endif
|
|
ld r11,_NIP(r1)
|
|
ld r12,_MSR(r1)
|
|
.ifc \srr,srr
|
|
mtspr SPRN_SRR0,r11
|
|
mtspr SPRN_SRR1,r12
|
|
1:
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
stb r4,PACASRR_VALID(r13)
|
|
#endif
|
|
.else
|
|
mtspr SPRN_HSRR0,r11
|
|
mtspr SPRN_HSRR1,r12
|
|
1:
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
stb r4,PACAHSRR_VALID(r13)
|
|
#endif
|
|
.endif
|
|
DEBUG_SRR_VALID \srr
|
|
|
|
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
|
|
lbz r4,PACAIRQSOFTMASK(r13)
|
|
tdnei r4,IRQS_ENABLED
|
|
#endif
|
|
|
|
BEGIN_FTR_SECTION
|
|
ld r10,_PPR(r1)
|
|
mtspr SPRN_PPR,r10
|
|
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
|
|
|
|
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_GPRS(7, 13, r1)
|
|
|
|
mtcr r3
|
|
mtlr r4
|
|
mtctr r5
|
|
mtspr SPRN_XER,r6
|
|
|
|
REST_GPRS(2, 6, r1)
|
|
REST_GPR(0, r1)
|
|
REST_GPR(1, r1)
|
|
.ifc \srr,srr
|
|
RFI_TO_USER
|
|
.else
|
|
HRFI_TO_USER
|
|
.endif
|
|
b . /* prevent speculative execution */
|
|
.Linterrupt_return_\srr\()_user_rst_end:
|
|
|
|
.Lrestore_nvgprs_\srr\():
|
|
REST_NVGPRS(r1)
|
|
b .Lrestore_nvgprs_\srr\()_cont
|
|
|
|
#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
|
|
li r11,IRQS_ALL_DISABLED
|
|
stb r11,PACAIRQSOFTMASK(r13)
|
|
bl interrupt_exit_user_restart
|
|
std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
|
|
b .Linterrupt_return_\srr\()_user_rst_start
|
|
1:
|
|
|
|
SOFT_MASK_TABLE(.Linterrupt_return_\srr\()_user_rst_start, 1b)
|
|
RESTART_TABLE(.Linterrupt_return_\srr\()_user_rst_start, .Linterrupt_return_\srr\()_user_rst_end, interrupt_return_\srr\()_user_restart)
|
|
#endif
|
|
|
|
.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
|
|
|
|
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
|
|
#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:
|
|
|
|
.Lfast_kernel_interrupt_return_\srr\():
|
|
cmpdi cr1,r3,0
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
.ifc \srr,srr
|
|
lbz r4,PACASRR_VALID(r13)
|
|
.else
|
|
lbz r4,PACAHSRR_VALID(r13)
|
|
.endif
|
|
cmpdi r4,0
|
|
li r4,0
|
|
bne 1f
|
|
#endif
|
|
ld r11,_NIP(r1)
|
|
ld r12,_MSR(r1)
|
|
.ifc \srr,srr
|
|
mtspr SPRN_SRR0,r11
|
|
mtspr SPRN_SRR1,r12
|
|
1:
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
stb r4,PACASRR_VALID(r13)
|
|
#endif
|
|
.else
|
|
mtspr SPRN_HSRR0,r11
|
|
mtspr SPRN_HSRR1,r12
|
|
1:
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
stb r4,PACAHSRR_VALID(r13)
|
|
#endif
|
|
.endif
|
|
DEBUG_SRR_VALID \srr
|
|
|
|
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_GPRS(7, 12, 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_GPRS(2, 5, r1)
|
|
|
|
bne- cr1,1f /* emulate stack store */
|
|
mtcr r6
|
|
REST_GPR(6, r1)
|
|
REST_GPR(0, r1)
|
|
REST_GPR(1, r1)
|
|
.ifc \srr,srr
|
|
RFI_TO_KERNEL
|
|
.else
|
|
HRFI_TO_KERNEL
|
|
.endif
|
|
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)
|
|
|
|
.ifc \srr,srr
|
|
RFI_TO_KERNEL
|
|
.else
|
|
HRFI_TO_KERNEL
|
|
.endif
|
|
b . /* prevent speculative execution */
|
|
.Linterrupt_return_\srr\()_kernel_rst_end:
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
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
|
|
li r11,IRQS_ALL_DISABLED
|
|
stb r11,PACAIRQSOFTMASK(r13)
|
|
bl interrupt_exit_kernel_restart
|
|
std r1,PACA_EXIT_SAVE_R1(r13) /* save r1 for restart */
|
|
b .Linterrupt_return_\srr\()_kernel_rst_start
|
|
1:
|
|
|
|
SOFT_MASK_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, 1b)
|
|
RESTART_TABLE(.Linterrupt_return_\srr\()_kernel_rst_start, .Linterrupt_return_\srr\()_kernel_rst_end, interrupt_return_\srr\()_kernel_restart)
|
|
#endif
|
|
|
|
.endm
|
|
|
|
interrupt_return_macro srr
|
|
#ifdef CONFIG_PPC_BOOK3S
|
|
interrupt_return_macro hsrr
|
|
|
|
.globl __end_soft_masked
|
|
__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)
|
|
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
|