555 lines
13 KiB
ArmAsm
555 lines
13 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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* Rewritten by Cort Dougan (cort@fsmlabs.com) for PReP
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* Copyright (C) 1996 Cort Dougan <cort@fsmlabs.com>
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* Adapted for Power Macintosh by Paul Mackerras.
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* Low-level exception handlers and MMU support
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* rewritten by Paul Mackerras.
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* Copyright (C) 1996 Paul Mackerras.
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* MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
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*
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* This file contains the system call entry code, context switch
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* code, and exception/interrupt return code for PowerPC.
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*/
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/sys.h>
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#include <linux/threads.h>
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#include <linux/linkage.h>
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#include <asm/reg.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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#include <asm/thread_info.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/ptrace.h>
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#include <asm/export.h>
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#include <asm/feature-fixups.h>
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#include <asm/barrier.h>
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#include <asm/kup.h>
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#include <asm/bug.h>
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#include <asm/interrupt.h>
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#include "head_32.h"
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/*
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* powerpc relies on return from interrupt/syscall being context synchronising
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* (which rfi is) to support ARCH_HAS_MEMBARRIER_SYNC_CORE without additional
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* synchronisation instructions.
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*/
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/*
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* Align to 4k in order to ensure that all functions modyfing srr0/srr1
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* fit into one page in order to not encounter a TLB miss between the
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* modification of srr0/srr1 and the associated rfi.
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*/
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.align 12
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#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_PPC_E500)
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.globl prepare_transfer_to_handler
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prepare_transfer_to_handler:
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/* if from kernel, check interrupted DOZE/NAP mode */
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lwz r12,TI_LOCAL_FLAGS(r2)
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mtcrf 0x01,r12
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bt- 31-TLF_NAPPING,4f
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bt- 31-TLF_SLEEPING,7f
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blr
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4: rlwinm r12,r12,0,~_TLF_NAPPING
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stw r12,TI_LOCAL_FLAGS(r2)
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b power_save_ppc32_restore
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7: rlwinm r12,r12,0,~_TLF_SLEEPING
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stw r12,TI_LOCAL_FLAGS(r2)
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lwz r9,_MSR(r11) /* if sleeping, clear MSR.EE */
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rlwinm r9,r9,0,~MSR_EE
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lwz r12,_LINK(r11) /* and return to address in LR */
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REST_GPR(2, r11)
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b fast_exception_return
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_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler)
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#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_PPC_E500 */
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#if defined(CONFIG_PPC_KUEP) && defined(CONFIG_PPC_BOOK3S_32)
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SYM_FUNC_START(__kuep_lock)
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lwz r9, THREAD+THSR0(r2)
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update_user_segments_by_4 r9, r10, r11, r12
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blr
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SYM_FUNC_END(__kuep_lock)
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SYM_FUNC_START_LOCAL(__kuep_unlock)
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lwz r9, THREAD+THSR0(r2)
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rlwinm r9,r9,0,~SR_NX
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update_user_segments_by_4 r9, r10, r11, r12
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blr
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SYM_FUNC_END(__kuep_unlock)
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.macro kuep_lock
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bl __kuep_lock
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.endm
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.macro kuep_unlock
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bl __kuep_unlock
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.endm
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#else
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.macro kuep_lock
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.endm
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.macro kuep_unlock
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.endm
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#endif
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.globl transfer_to_syscall
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transfer_to_syscall:
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stw r3, ORIG_GPR3(r1)
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stw r11, GPR1(r1)
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stw r11, 0(r1)
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mflr r12
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stw r12, _LINK(r1)
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#ifdef CONFIG_BOOKE_OR_40x
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rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
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#endif
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lis r12,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
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SAVE_GPR(2, r1)
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addi r12,r12,STACK_FRAME_REGS_MARKER@l
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stw r9,_MSR(r1)
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li r2, INTERRUPT_SYSCALL
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stw r12,STACK_INT_FRAME_MARKER(r1)
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stw r2,_TRAP(r1)
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SAVE_GPR(0, r1)
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SAVE_GPRS(3, 8, r1)
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addi r2,r10,-THREAD
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SAVE_NVGPRS(r1)
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kuep_lock
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/* Calling convention has r3 = regs, r4 = orig r0 */
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addi r3,r1,STACK_INT_FRAME_REGS
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mr r4,r0
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bl system_call_exception
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ret_from_syscall:
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addi r4,r1,STACK_INT_FRAME_REGS
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li r5,0
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bl syscall_exit_prepare
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#ifdef CONFIG_PPC_47x
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lis r4,icache_44x_need_flush@ha
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lwz r5,icache_44x_need_flush@l(r4)
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cmplwi cr0,r5,0
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bne- 2f
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#endif /* CONFIG_PPC_47x */
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kuep_unlock
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lwz r4,_LINK(r1)
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lwz r5,_CCR(r1)
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mtlr r4
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lwz r7,_NIP(r1)
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lwz r8,_MSR(r1)
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cmpwi r3,0
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REST_GPR(3, r1)
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syscall_exit_finish:
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mtspr SPRN_SRR0,r7
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mtspr SPRN_SRR1,r8
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bne 3f
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mtcr r5
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1: REST_GPR(2, r1)
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REST_GPR(1, r1)
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rfi
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#ifdef CONFIG_40x
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b . /* Prevent prefetch past rfi */
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#endif
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3: mtcr r5
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lwz r4,_CTR(r1)
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lwz r5,_XER(r1)
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REST_NVGPRS(r1)
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mtctr r4
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mtxer r5
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REST_GPR(0, r1)
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REST_GPRS(3, 12, r1)
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b 1b
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#ifdef CONFIG_44x
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2: li r7,0
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iccci r0,r0
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stw r7,icache_44x_need_flush@l(r4)
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b 1b
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#endif /* CONFIG_44x */
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.globl ret_from_fork
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ret_from_fork:
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REST_NVGPRS(r1)
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bl schedule_tail
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li r3,0
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b ret_from_syscall
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.globl ret_from_kernel_thread
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ret_from_kernel_thread:
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REST_NVGPRS(r1)
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bl schedule_tail
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mtctr r14
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mr r3,r15
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PPC440EP_ERR42
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bctrl
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li r3,0
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b ret_from_syscall
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/*
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* This routine switches between two different tasks. The process
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* state of one is saved on its kernel stack. Then the state
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* of the other is restored from its kernel stack. The memory
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* management hardware is updated to the second process's state.
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* Finally, we can return to the second process.
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* On entry, r3 points to the THREAD for the current task, r4
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* points to the THREAD for the new task.
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*
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* This routine is always called with interrupts disabled.
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*
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* Note: there are two ways to get to the "going out" portion
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* of this code; either by coming in via the entry (_switch)
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* or via "fork" which must set up an environment equivalent
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* to the "_switch" path. If you change this , you'll have to
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* change the fork code also.
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*
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* The code which creates the new task context is in 'copy_thread'
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* in arch/ppc/kernel/process.c
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*/
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_GLOBAL(_switch)
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stwu r1,-SWITCH_FRAME_SIZE(r1)
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mflr r0
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stw r0,SWITCH_FRAME_SIZE+4(r1)
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/* r3-r12 are caller saved -- Cort */
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SAVE_NVGPRS(r1)
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stw r0,_NIP(r1) /* Return to switch caller */
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mfcr r10
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stw r10,_CCR(r1)
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stw r1,KSP(r3) /* Set old stack pointer */
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#ifdef CONFIG_SMP
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/* We need a sync somewhere here to make sure that if the
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* previous task gets rescheduled on another CPU, it sees all
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* stores it has performed on this one.
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*/
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sync
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#endif /* CONFIG_SMP */
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tophys(r0,r4)
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mtspr SPRN_SPRG_THREAD,r0 /* Update current THREAD phys addr */
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lwz r1,KSP(r4) /* Load new stack pointer */
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/* save the old current 'last' for return value */
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mr r3,r2
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addi r2,r4,-THREAD /* Update current */
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lwz r0,_CCR(r1)
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mtcrf 0xFF,r0
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/* r3-r12 are destroyed -- Cort */
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REST_NVGPRS(r1)
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lwz r4,_NIP(r1) /* Return to _switch caller in new task */
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mtlr r4
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addi r1,r1,SWITCH_FRAME_SIZE
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blr
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.globl fast_exception_return
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fast_exception_return:
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#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
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andi. r10,r9,MSR_RI /* check for recoverable interrupt */
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beq 3f /* if not, we've got problems */
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#endif
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2: lwz r10,_CCR(r11)
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REST_GPRS(1, 6, r11)
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mtcr r10
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lwz r10,_LINK(r11)
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mtlr r10
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/* Clear the exception marker on the stack to avoid confusing stacktrace */
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li r10, 0
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stw r10, 8(r11)
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REST_GPR(10, r11)
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#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
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mtspr SPRN_NRI, r0
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#endif
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mtspr SPRN_SRR1,r9
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mtspr SPRN_SRR0,r12
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REST_GPR(9, r11)
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REST_GPR(12, r11)
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REST_GPR(11, r11)
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rfi
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#ifdef CONFIG_40x
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b . /* Prevent prefetch past rfi */
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#endif
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_ASM_NOKPROBE_SYMBOL(fast_exception_return)
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/* aargh, a nonrecoverable interrupt, panic */
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/* aargh, we don't know which trap this is */
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3:
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li r10,-1
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stw r10,_TRAP(r11)
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prepare_transfer_to_handler
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bl unrecoverable_exception
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trap /* should not get here */
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.globl interrupt_return
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interrupt_return:
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lwz r4,_MSR(r1)
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addi r3,r1,STACK_INT_FRAME_REGS
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andi. r0,r4,MSR_PR
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beq .Lkernel_interrupt_return
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bl interrupt_exit_user_prepare
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cmpwi r3,0
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kuep_unlock
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bne- .Lrestore_nvgprs
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.Lfast_user_interrupt_return:
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lwz r11,_NIP(r1)
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lwz r12,_MSR(r1)
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mtspr SPRN_SRR0,r11
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mtspr SPRN_SRR1,r12
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BEGIN_FTR_SECTION
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stwcx. r0,0,r1 /* to clear the reservation */
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FTR_SECTION_ELSE
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lwarx r0,0,r1
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ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
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lwz r3,_CCR(r1)
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lwz r4,_LINK(r1)
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lwz r5,_CTR(r1)
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lwz r6,_XER(r1)
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li r0,0
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/*
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* Leaving a stale exception marker on the stack can confuse
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* the reliable stack unwinder later on. Clear it.
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*/
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stw r0,8(r1)
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REST_GPRS(7, 12, r1)
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mtcr r3
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mtlr r4
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mtctr r5
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mtspr SPRN_XER,r6
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REST_GPRS(2, 6, r1)
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REST_GPR(0, r1)
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REST_GPR(1, r1)
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rfi
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#ifdef CONFIG_40x
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b . /* Prevent prefetch past rfi */
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#endif
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.Lrestore_nvgprs:
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REST_NVGPRS(r1)
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b .Lfast_user_interrupt_return
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.Lkernel_interrupt_return:
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bl interrupt_exit_kernel_prepare
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.Lfast_kernel_interrupt_return:
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cmpwi cr1,r3,0
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lwz r11,_NIP(r1)
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lwz r12,_MSR(r1)
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mtspr SPRN_SRR0,r11
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mtspr SPRN_SRR1,r12
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BEGIN_FTR_SECTION
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stwcx. r0,0,r1 /* to clear the reservation */
|
||
|
|
FTR_SECTION_ELSE
|
||
|
|
lwarx r0,0,r1
|
||
|
|
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
|
||
|
|
|
||
|
|
lwz r3,_LINK(r1)
|
||
|
|
lwz r4,_CTR(r1)
|
||
|
|
lwz r5,_XER(r1)
|
||
|
|
lwz 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.
|
||
|
|
*/
|
||
|
|
stw r0,8(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)
|
||
|
|
rfi
|
||
|
|
#ifdef CONFIG_40x
|
||
|
|
b . /* Prevent prefetch past rfi */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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
|
||
|
|
* SPRG Scratch0 as temporary storage to hold the store
|
||
|
|
* data, as interrupts are disabled here so it won't be clobbered.
|
||
|
|
*/
|
||
|
|
mtcr r6
|
||
|
|
#ifdef CONFIG_BOOKE
|
||
|
|
mtspr SPRN_SPRG_WSCRATCH0, r9
|
||
|
|
#else
|
||
|
|
mtspr SPRN_SPRG_SCRATCH0, r9
|
||
|
|
#endif
|
||
|
|
addi r9,r1,INT_FRAME_SIZE /* get original r1 */
|
||
|
|
REST_GPR(6, r1)
|
||
|
|
REST_GPR(0, r1)
|
||
|
|
REST_GPR(1, r1)
|
||
|
|
stw r9,0(r1) /* perform store component of stwu */
|
||
|
|
#ifdef CONFIG_BOOKE
|
||
|
|
mfspr r9, SPRN_SPRG_RSCRATCH0
|
||
|
|
#else
|
||
|
|
mfspr r9, SPRN_SPRG_SCRATCH0
|
||
|
|
#endif
|
||
|
|
rfi
|
||
|
|
#ifdef CONFIG_40x
|
||
|
|
b . /* Prevent prefetch past rfi */
|
||
|
|
#endif
|
||
|
|
_ASM_NOKPROBE_SYMBOL(interrupt_return)
|
||
|
|
|
||
|
|
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Returning from a critical interrupt in user mode doesn't need
|
||
|
|
* to be any different from a normal exception. For a critical
|
||
|
|
* interrupt in the kernel, we just return (without checking for
|
||
|
|
* preemption) since the interrupt may have happened at some crucial
|
||
|
|
* place (e.g. inside the TLB miss handler), and because we will be
|
||
|
|
* running with r1 pointing into critical_stack, not the current
|
||
|
|
* process's kernel stack (and therefore current_thread_info() will
|
||
|
|
* give the wrong answer).
|
||
|
|
* We have to restore various SPRs that may have been in use at the
|
||
|
|
* time of the critical interrupt.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_40x
|
||
|
|
#define PPC_40x_TURN_OFF_MSR_DR \
|
||
|
|
/* avoid any possible TLB misses here by turning off MSR.DR, we \
|
||
|
|
* assume the instructions here are mapped by a pinned TLB entry */ \
|
||
|
|
li r10,MSR_IR; \
|
||
|
|
mtmsr r10; \
|
||
|
|
isync; \
|
||
|
|
tophys(r1, r1);
|
||
|
|
#else
|
||
|
|
#define PPC_40x_TURN_OFF_MSR_DR
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define RET_FROM_EXC_LEVEL(exc_lvl_srr0, exc_lvl_srr1, exc_lvl_rfi) \
|
||
|
|
REST_NVGPRS(r1); \
|
||
|
|
lwz r3,_MSR(r1); \
|
||
|
|
andi. r3,r3,MSR_PR; \
|
||
|
|
bne interrupt_return; \
|
||
|
|
REST_GPR(0, r1); \
|
||
|
|
REST_GPRS(2, 8, r1); \
|
||
|
|
lwz r10,_XER(r1); \
|
||
|
|
lwz r11,_CTR(r1); \
|
||
|
|
mtspr SPRN_XER,r10; \
|
||
|
|
mtctr r11; \
|
||
|
|
stwcx. r0,0,r1; /* to clear the reservation */ \
|
||
|
|
lwz r11,_LINK(r1); \
|
||
|
|
mtlr r11; \
|
||
|
|
lwz r10,_CCR(r1); \
|
||
|
|
mtcrf 0xff,r10; \
|
||
|
|
PPC_40x_TURN_OFF_MSR_DR; \
|
||
|
|
lwz r9,_DEAR(r1); \
|
||
|
|
lwz r10,_ESR(r1); \
|
||
|
|
mtspr SPRN_DEAR,r9; \
|
||
|
|
mtspr SPRN_ESR,r10; \
|
||
|
|
lwz r11,_NIP(r1); \
|
||
|
|
lwz r12,_MSR(r1); \
|
||
|
|
mtspr exc_lvl_srr0,r11; \
|
||
|
|
mtspr exc_lvl_srr1,r12; \
|
||
|
|
REST_GPRS(9, 12, r1); \
|
||
|
|
REST_GPR(1, r1); \
|
||
|
|
exc_lvl_rfi; \
|
||
|
|
b .; /* prevent prefetch past exc_lvl_rfi */
|
||
|
|
|
||
|
|
#define RESTORE_xSRR(exc_lvl_srr0, exc_lvl_srr1) \
|
||
|
|
lwz r9,_##exc_lvl_srr0(r1); \
|
||
|
|
lwz r10,_##exc_lvl_srr1(r1); \
|
||
|
|
mtspr SPRN_##exc_lvl_srr0,r9; \
|
||
|
|
mtspr SPRN_##exc_lvl_srr1,r10;
|
||
|
|
|
||
|
|
#if defined(CONFIG_PPC_E500)
|
||
|
|
#ifdef CONFIG_PHYS_64BIT
|
||
|
|
#define RESTORE_MAS7 \
|
||
|
|
lwz r11,MAS7(r1); \
|
||
|
|
mtspr SPRN_MAS7,r11;
|
||
|
|
#else
|
||
|
|
#define RESTORE_MAS7
|
||
|
|
#endif /* CONFIG_PHYS_64BIT */
|
||
|
|
#define RESTORE_MMU_REGS \
|
||
|
|
lwz r9,MAS0(r1); \
|
||
|
|
lwz r10,MAS1(r1); \
|
||
|
|
lwz r11,MAS2(r1); \
|
||
|
|
mtspr SPRN_MAS0,r9; \
|
||
|
|
lwz r9,MAS3(r1); \
|
||
|
|
mtspr SPRN_MAS1,r10; \
|
||
|
|
lwz r10,MAS6(r1); \
|
||
|
|
mtspr SPRN_MAS2,r11; \
|
||
|
|
mtspr SPRN_MAS3,r9; \
|
||
|
|
mtspr SPRN_MAS6,r10; \
|
||
|
|
RESTORE_MAS7;
|
||
|
|
#elif defined(CONFIG_44x)
|
||
|
|
#define RESTORE_MMU_REGS \
|
||
|
|
lwz r9,MMUCR(r1); \
|
||
|
|
mtspr SPRN_MMUCR,r9;
|
||
|
|
#else
|
||
|
|
#define RESTORE_MMU_REGS
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_40x
|
||
|
|
.globl ret_from_crit_exc
|
||
|
|
ret_from_crit_exc:
|
||
|
|
lis r9,crit_srr0@ha;
|
||
|
|
lwz r9,crit_srr0@l(r9);
|
||
|
|
lis r10,crit_srr1@ha;
|
||
|
|
lwz r10,crit_srr1@l(r10);
|
||
|
|
mtspr SPRN_SRR0,r9;
|
||
|
|
mtspr SPRN_SRR1,r10;
|
||
|
|
RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, PPC_RFCI)
|
||
|
|
_ASM_NOKPROBE_SYMBOL(ret_from_crit_exc)
|
||
|
|
#endif /* CONFIG_40x */
|
||
|
|
|
||
|
|
#ifdef CONFIG_BOOKE
|
||
|
|
.globl ret_from_crit_exc
|
||
|
|
ret_from_crit_exc:
|
||
|
|
RESTORE_xSRR(SRR0,SRR1);
|
||
|
|
RESTORE_MMU_REGS;
|
||
|
|
RET_FROM_EXC_LEVEL(SPRN_CSRR0, SPRN_CSRR1, PPC_RFCI)
|
||
|
|
_ASM_NOKPROBE_SYMBOL(ret_from_crit_exc)
|
||
|
|
|
||
|
|
.globl ret_from_debug_exc
|
||
|
|
ret_from_debug_exc:
|
||
|
|
RESTORE_xSRR(SRR0,SRR1);
|
||
|
|
RESTORE_xSRR(CSRR0,CSRR1);
|
||
|
|
RESTORE_MMU_REGS;
|
||
|
|
RET_FROM_EXC_LEVEL(SPRN_DSRR0, SPRN_DSRR1, PPC_RFDI)
|
||
|
|
_ASM_NOKPROBE_SYMBOL(ret_from_debug_exc)
|
||
|
|
|
||
|
|
.globl ret_from_mcheck_exc
|
||
|
|
ret_from_mcheck_exc:
|
||
|
|
RESTORE_xSRR(SRR0,SRR1);
|
||
|
|
RESTORE_xSRR(CSRR0,CSRR1);
|
||
|
|
RESTORE_xSRR(DSRR0,DSRR1);
|
||
|
|
RESTORE_MMU_REGS;
|
||
|
|
RET_FROM_EXC_LEVEL(SPRN_MCSRR0, SPRN_MCSRR1, PPC_RFMCI)
|
||
|
|
_ASM_NOKPROBE_SYMBOL(ret_from_mcheck_exc)
|
||
|
|
#endif /* CONFIG_BOOKE */
|
||
|
|
#endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
|