558 lines
13 KiB
ArmAsm
558 lines
13 KiB
ArmAsm
/*
|
|
* 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>
|
|
|
|
#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
|
|
LDIMM (r4, PREEMPT_ACTIVE)
|
|
st r4, @(TI_PRE_COUNT, r8)
|
|
ENABLE_INTERRUPTS(r4)
|
|
bl schedule
|
|
ldi r4, #0
|
|
st r4, @(TI_PRE_COUNT, r8)
|
|
DISABLE_INTERRUPTS(r4)
|
|
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)
|