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-rw-r--r--arch/m32r/kernel/entry.S553
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diff --git a/arch/m32r/kernel/entry.S b/arch/m32r/kernel/entry.S
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index bbf48f2aa2a7..000000000000
--- a/arch/m32r/kernel/entry.S
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-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * linux/arch/m32r/kernel/entry.S
- *
- * Copyright (c) 2001, 2002 Hirokazu Takata, Hitoshi Yamamoto, H. Kondo
- * Copyright (c) 2003 Hitoshi Yamamoto
- * Copyright (c) 2004 Hirokazu Takata <takata at linux-m32r.org>
- *
- * Taken from i386 version.
- * Copyright (C) 1991, 1992 Linus Torvalds
- */
-
-/*
- * entry.S contains the system-call and fault low-level handling routines.
- * This also contains the timer-interrupt handler, as well as all interrupts
- * and faults that can result in a task-switch.
- *
- * NOTE: This code handles signal-recognition, which happens every time
- * after a timer-interrupt and after each system call.
- *
- * Stack layout in 'ret_from_system_call':
- * ptrace needs to have all regs on the stack.
- * if the order here is changed, it needs to be
- * updated in fork.c:copy_thread, signal.c:do_signal,
- * ptrace.c and ptrace.h
- *
- * M32R/M32Rx/M32R2
- * @(sp) - r4
- * @(0x04,sp) - r5
- * @(0x08,sp) - r6
- * @(0x0c,sp) - *pt_regs
- * @(0x10,sp) - r0
- * @(0x14,sp) - r1
- * @(0x18,sp) - r2
- * @(0x1c,sp) - r3
- * @(0x20,sp) - r7
- * @(0x24,sp) - r8
- * @(0x28,sp) - r9
- * @(0x2c,sp) - r10
- * @(0x30,sp) - r11
- * @(0x34,sp) - r12
- * @(0x38,sp) - syscall_nr
- * @(0x3c,sp) - acc0h
- * @(0x40,sp) - acc0l
- * @(0x44,sp) - acc1h ; ISA_DSP_LEVEL2 only
- * @(0x48,sp) - acc1l ; ISA_DSP_LEVEL2 only
- * @(0x4c,sp) - psw
- * @(0x50,sp) - bpc
- * @(0x54,sp) - bbpsw
- * @(0x58,sp) - bbpc
- * @(0x5c,sp) - spu (cr3)
- * @(0x60,sp) - fp (r13)
- * @(0x64,sp) - lr (r14)
- * @(0x68,sp) - spi (cr2)
- * @(0x6c,sp) - orig_r0
- */
-
-#include <linux/linkage.h>
-#include <asm/irq.h>
-#include <asm/unistd.h>
-#include <asm/assembler.h>
-#include <asm/thread_info.h>
-#include <asm/errno.h>
-#include <asm/segment.h>
-#include <asm/smp.h>
-#include <asm/page.h>
-#include <asm/m32r.h>
-#include <asm/mmu_context.h>
-#include <asm/asm-offsets.h>
-
-#if !defined(CONFIG_MMU)
-#define sys_madvise sys_ni_syscall
-#define sys_readahead sys_ni_syscall
-#define sys_mprotect sys_ni_syscall
-#define sys_msync sys_ni_syscall
-#define sys_mlock sys_ni_syscall
-#define sys_munlock sys_ni_syscall
-#define sys_mlockall sys_ni_syscall
-#define sys_munlockall sys_ni_syscall
-#define sys_mremap sys_ni_syscall
-#define sys_mincore sys_ni_syscall
-#define sys_remap_file_pages sys_ni_syscall
-#endif /* CONFIG_MMU */
-
-#define R4(reg) @reg
-#define R5(reg) @(0x04,reg)
-#define R6(reg) @(0x08,reg)
-#define PTREGS(reg) @(0x0C,reg)
-#define R0(reg) @(0x10,reg)
-#define R1(reg) @(0x14,reg)
-#define R2(reg) @(0x18,reg)
-#define R3(reg) @(0x1C,reg)
-#define R7(reg) @(0x20,reg)
-#define R8(reg) @(0x24,reg)
-#define R9(reg) @(0x28,reg)
-#define R10(reg) @(0x2C,reg)
-#define R11(reg) @(0x30,reg)
-#define R12(reg) @(0x34,reg)
-#define SYSCALL_NR(reg) @(0x38,reg)
-#define ACC0H(reg) @(0x3C,reg)
-#define ACC0L(reg) @(0x40,reg)
-#define ACC1H(reg) @(0x44,reg)
-#define ACC1L(reg) @(0x48,reg)
-#define PSW(reg) @(0x4C,reg)
-#define BPC(reg) @(0x50,reg)
-#define BBPSW(reg) @(0x54,reg)
-#define BBPC(reg) @(0x58,reg)
-#define SPU(reg) @(0x5C,reg)
-#define FP(reg) @(0x60,reg) /* FP = R13 */
-#define LR(reg) @(0x64,reg)
-#define SP(reg) @(0x68,reg)
-#define ORIG_R0(reg) @(0x6C,reg)
-
-#define nr_syscalls ((syscall_table_size)/4)
-
-#ifdef CONFIG_PREEMPT
-#define preempt_stop(x) DISABLE_INTERRUPTS(x)
-#else
-#define preempt_stop(x)
-#define resume_kernel restore_all
-#endif
-
-/* how to get the thread information struct from ASM */
-#define GET_THREAD_INFO(reg) GET_THREAD_INFO reg
- .macro GET_THREAD_INFO reg
- ldi \reg, #-THREAD_SIZE
- and \reg, sp
- .endm
-
-ENTRY(ret_from_kernel_thread)
- pop r0
- bl schedule_tail
- GET_THREAD_INFO(r8)
- ld r0, R0(r8)
- ld r1, R1(r8)
- jl r1
- bra syscall_exit
-
-ENTRY(ret_from_fork)
- pop r0
- bl schedule_tail
- GET_THREAD_INFO(r8)
- bra syscall_exit
-
-/*
- * Return to user mode is not as complex as all this looks,
- * but we want the default path for a system call return to
- * go as quickly as possible which is why some of this is
- * less clear than it otherwise should be.
- */
-
- ; userspace resumption stub bypassing syscall exit tracing
- ALIGN
-ret_from_exception:
- preempt_stop(r4)
-ret_from_intr:
- ld r4, PSW(sp)
-#ifdef CONFIG_ISA_M32R2
- and3 r4, r4, #0x8800 ; check BSM and BPM bits
-#else
- and3 r4, r4, #0x8000 ; check BSM bit
-#endif
- beqz r4, resume_kernel
-resume_userspace:
- DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
- ; setting need_resched or sigpending
- ; between sampling and the iret
- GET_THREAD_INFO(r8)
- ld r9, @(TI_FLAGS, r8)
- and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done on
- ; int/exception return?
- bnez r4, work_pending
- bra restore_all
-
-#ifdef CONFIG_PREEMPT
-ENTRY(resume_kernel)
- GET_THREAD_INFO(r8)
- ld r9, @(TI_PRE_COUNT, r8) ; non-zero preempt_count ?
- bnez r9, restore_all
-need_resched:
- ld r9, @(TI_FLAGS, r8) ; need_resched set ?
- and3 r4, r9, #_TIF_NEED_RESCHED
- beqz r4, restore_all
- ld r4, PSW(sp) ; interrupts off (exception path) ?
- and3 r4, r4, #0x4000
- beqz r4, restore_all
- bl preempt_schedule_irq
- bra need_resched
-#endif
-
- ; system call handler stub
-ENTRY(system_call)
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- ENABLE_INTERRUPTS(r4) ; Enable interrupt
- st sp, PTREGS(sp) ; implicit pt_regs parameter
- cmpui r7, #NR_syscalls
- bnc syscall_badsys
- st r7, SYSCALL_NR(sp) ; syscall_nr
- ; system call tracing in operation
- GET_THREAD_INFO(r8)
- ld r9, @(TI_FLAGS, r8)
- and3 r4, r9, #_TIF_SYSCALL_TRACE
- bnez r4, syscall_trace_entry
-syscall_call:
- slli r7, #2 ; table jump for the system call
- LDIMM (r4, sys_call_table)
- add r7, r4
- ld r7, @r7
- jl r7 ; execute system call
- st r0, R0(sp) ; save the return value
-syscall_exit:
- DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
- ; setting need_resched or sigpending
- ; between sampling and the iret
- ld r9, @(TI_FLAGS, r8)
- and3 r4, r9, #_TIF_ALLWORK_MASK ; current->work
- bnez r4, syscall_exit_work
-restore_all:
- RESTORE_ALL
-
- # perform work that needs to be done immediately before resumption
- # r9 : flags
- ALIGN
-work_pending:
- and3 r4, r9, #_TIF_NEED_RESCHED
- beqz r4, work_notifysig
-work_resched:
- bl schedule
- DISABLE_INTERRUPTS(r4) ; make sure we don't miss an interrupt
- ; setting need_resched or sigpending
- ; between sampling and the iret
- ld r9, @(TI_FLAGS, r8)
- and3 r4, r9, #_TIF_WORK_MASK ; is there any work to be done other
- ; than syscall tracing?
- beqz r4, restore_all
- and3 r4, r4, #_TIF_NEED_RESCHED
- bnez r4, work_resched
-
-work_notifysig: ; deal with pending signals and
- ; notify-resume requests
- mv r0, sp ; arg1 : struct pt_regs *regs
- mv r1, r9 ; arg2 : __u32 thread_info_flags
- bl do_notify_resume
- bra resume_userspace
-
- ; perform syscall exit tracing
- ALIGN
-syscall_trace_entry:
- ldi r4, #-ENOSYS
- st r4, R0(sp)
- bl do_syscall_trace
- ld r0, ORIG_R0(sp)
- ld r1, R1(sp)
- ld r2, R2(sp)
- ld r3, R3(sp)
- ld r4, R4(sp)
- ld r5, R5(sp)
- ld r6, R6(sp)
- ld r7, SYSCALL_NR(sp)
- cmpui r7, #NR_syscalls
- bc syscall_call
- bra syscall_exit
-
- ; perform syscall exit tracing
- ALIGN
-syscall_exit_work:
- ld r9, @(TI_FLAGS, r8)
- and3 r4, r9, #_TIF_SYSCALL_TRACE
- beqz r4, work_pending
- ENABLE_INTERRUPTS(r4) ; could let do_syscall_trace() call
- ; schedule() instead
- bl do_syscall_trace
- bra resume_userspace
-
- ALIGN
-syscall_fault:
- SAVE_ALL
- GET_THREAD_INFO(r8)
- ldi r4, #-EFAULT
- st r4, R0(sp)
- bra resume_userspace
-
- ALIGN
-syscall_badsys:
- ldi r4, #-ENOSYS
- st r4, R0(sp)
- bra resume_userspace
-
- .global eit_vector
-
- .equ ei_vec_table, eit_vector + 0x0200
-
-/*
- * EI handler routine
- */
-ENTRY(ei_handler)
-#if defined(CONFIG_CHIP_M32700)
- ; WORKAROUND: force to clear SM bit and use the kernel stack (SPI).
- SWITCH_TO_KERNEL_STACK
-#endif
- SAVE_ALL
- mv r1, sp ; arg1(regs)
- ; get ICU status
- seth r0, #shigh(M32R_ICU_ISTS_ADDR)
- ld r0, @(low(M32R_ICU_ISTS_ADDR),r0)
- push r0
-#if defined(CONFIG_SMP)
- /*
- * If IRQ == 0 --> Nothing to do, Not write IMASK
- * If IRQ == IPI --> Do IPI handler, Not write IMASK
- * If IRQ != 0, IPI --> Do do_IRQ(), Write IMASK
- */
- slli r0, #4
- srli r0, #24 ; r0(irq_num<<2)
- ;; IRQ exist check
-#if defined(CONFIG_CHIP_M32700)
- /* WORKAROUND: IMASK bug M32700-TS1, TS2 chip. */
- bnez r0, 0f
- ld24 r14, #0x00070000
- seth r0, #shigh(M32R_ICU_IMASK_ADDR)
- st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
- bra 1f
- .fillinsn
-0:
-#endif /* CONFIG_CHIP_M32700 */
- beqz r0, 1f ; if (!irq_num) goto exit
- ;; IPI check
- cmpi r0, #(M32R_IRQ_IPI0<<2) ; ISN < IPI0 check
- bc 2f
- cmpi r0, #((M32R_IRQ_IPI7+1)<<2) ; ISN > IPI7 check
- bnc 2f
- LDIMM (r2, ei_vec_table)
- add r2, r0
- ld r2, @r2
- beqz r2, 1f ; if (no IPI handler) goto exit
- mv r0, r1 ; arg0(regs)
- jl r2
- .fillinsn
-1:
- addi sp, #4
- bra restore_all
- .fillinsn
-2:
- srli r0, #2
-#else /* not CONFIG_SMP */
- srli r0, #22 ; r0(irq)
-#endif /* not CONFIG_SMP */
-
-#if defined(CONFIG_PLAT_HAS_INT1ICU)
- add3 r2, r0, #-(M32R_IRQ_INT1) ; INT1# interrupt
- bnez r2, 3f
- seth r0, #shigh(M32R_INT1ICU_ISTS)
- lduh r0, @(low(M32R_INT1ICU_ISTS),r0) ; bit10-6 : ISN
- slli r0, #21
- srli r0, #27 ; ISN
- addi r0, #(M32R_INT1ICU_IRQ_BASE)
- bra check_end
- .fillinsn
-3:
-#endif /* CONFIG_PLAT_HAS_INT1ICU */
-#if defined(CONFIG_PLAT_HAS_INT0ICU)
- add3 r2, r0, #-(M32R_IRQ_INT0) ; INT0# interrupt
- bnez r2, 4f
- seth r0, #shigh(M32R_INT0ICU_ISTS)
- lduh r0, @(low(M32R_INT0ICU_ISTS),r0) ; bit10-6 : ISN
- slli r0, #21
- srli r0, #27 ; ISN
- add3 r0, r0, #(M32R_INT0ICU_IRQ_BASE)
- bra check_end
- .fillinsn
-4:
-#endif /* CONFIG_PLAT_HAS_INT0ICU */
-#if defined(CONFIG_PLAT_HAS_INT2ICU)
- add3 r2, r0, #-(M32R_IRQ_INT2) ; INT2# interrupt
- bnez r2, 5f
- seth r0, #shigh(M32R_INT2ICU_ISTS)
- lduh r0, @(low(M32R_INT2ICU_ISTS),r0) ; bit10-6 : ISN
- slli r0, #21
- srli r0, #27 ; ISN
- add3 r0, r0, #(M32R_INT2ICU_IRQ_BASE)
- ; bra check_end
- .fillinsn
-5:
-#endif /* CONFIG_PLAT_HAS_INT2ICU */
-
-check_end:
- bl do_IRQ
- pop r14
- seth r0, #shigh(M32R_ICU_IMASK_ADDR)
- st r14, @(low(M32R_ICU_IMASK_ADDR),r0)
- bra ret_from_intr
-
-/*
- * Default EIT handler
- */
- ALIGN
-int_msg:
- .asciz "Unknown interrupt\n"
- .byte 0
-
-ENTRY(default_eit_handler)
- push r0
- mvfc r0, psw
- push r1
- push r2
- push r3
- push r0
- LDIMM (r0, __KERNEL_DS)
- mv r0, r1
- mv r0, r2
- LDIMM (r0, int_msg)
- bl printk
- pop r0
- pop r3
- pop r2
- pop r1
- mvtc r0, psw
- pop r0
-infinit:
- bra infinit
-
-#ifdef CONFIG_MMU
-/*
- * Access Exception handler
- */
-ENTRY(ace_handler)
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
-
- seth r2, #shigh(MMU_REG_BASE) /* Check status register */
- ld r4, @(low(MESTS_offset),r2)
- st r4, @(low(MESTS_offset),r2)
- srl3 r1, r4, #4
-#ifdef CONFIG_CHIP_M32700
- and3 r1, r1, #0x0000ffff
- ; WORKAROUND: ignore TME bit for the M32700(TS1).
-#endif /* CONFIG_CHIP_M32700 */
- beqz r1, inst
-oprand:
- ld r2, @(low(MDEVA_offset),r2) ; set address
- srli r1, #1
- bra 1f
-inst:
- and3 r1, r4, #2
- srli r1, #1
- or3 r1, r1, #8
- mvfc r2, bpc ; set address
- .fillinsn
-1:
- mvfc r3, psw
- mv r0, sp
- and3 r3, r3, 0x800
- srli r3, #9
- or r1, r3
- /*
- * do_page_fault():
- * r0 : struct pt_regs *regs
- * r1 : unsigned long error-code
- * r2 : unsigned long address
- * error-code:
- * +------+------+------+------+
- * | bit3 | bit2 | bit1 | bit0 |
- * +------+------+------+------+
- * bit 3 == 0:means data, 1:means instruction
- * bit 2 == 0:means kernel, 1:means user-mode
- * bit 1 == 0:means read, 1:means write
- * bit 0 == 0:means no page found 1:means protection fault
- *
- */
- bl do_page_fault
- bra ret_from_intr
-#endif /* CONFIG_MMU */
-
-
-ENTRY(alignment_check)
- /* void alignment_check(int error_code) */
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- ldi r1, #0x30 ; error_code
- mv r0, sp ; pt_regs
- bl do_alignment_check
-error_code:
- bra ret_from_exception
-
-ENTRY(rie_handler)
- /* void rie_handler(int error_code) */
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- ldi r1, #0x20 ; error_code
- mv r0, sp ; pt_regs
- bl do_rie_handler
- bra error_code
-
-ENTRY(pie_handler)
- /* void pie_handler(int error_code) */
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- ldi r1, #0 ; error_code ; FIXME
- mv r0, sp ; pt_regs
- bl do_pie_handler
- bra error_code
-
-ENTRY(debug_trap)
- /* void debug_trap(void) */
- .global withdraw_debug_trap
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- mv r0, sp ; pt_regs
- bl withdraw_debug_trap
- ldi r1, #0 ; error_code
- mv r0, sp ; pt_regs
- bl do_debug_trap
- bra error_code
-
-ENTRY(ill_trap)
- /* void ill_trap(void) */
- SWITCH_TO_KERNEL_STACK
- SAVE_ALL
- ldi r1, #0 ; error_code ; FIXME
- mv r0, sp ; pt_regs
- bl do_ill_trap
- bra error_code
-
-ENTRY(cache_flushing_handler)
- /* void _flush_cache_all(void); */
- .global _flush_cache_all
- SWITCH_TO_KERNEL_STACK
- push r0
- push r1
- push r2
- push r3
- push r4
- push r5
- push r6
- push r7
- push lr
- bl _flush_cache_all
- pop lr
- pop r7
- pop r6
- pop r5
- pop r4
- pop r3
- pop r2
- pop r1
- pop r0
- rte
-
- .section .rodata,"a"
-#include "syscall_table.S"
-
-syscall_table_size=(.-sys_call_table)