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Diffstat (limited to 'arch/m32r/kernel/entry.S')
| -rw-r--r-- | arch/m32r/kernel/entry.S | 553 |
1 files changed, 0 insertions, 553 deletions
diff --git a/arch/m32r/kernel/entry.S b/arch/m32r/kernel/entry.S deleted file mode 100644 index bbf48f2aa2a7..000000000000 --- a/arch/m32r/kernel/entry.S +++ /dev/null @@ -1,553 +0,0 @@ -/* 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) |