+++ /dev/null
-/* -*- mode: asm -*-
- *
- * linux/arch/h8300/platform/h8s/entry.S
- *
- * Yoshinori Sato <ysato@users.sourceforge.jp>
- *
- * fairly heavy changes to fix syscall args and signal processing
- * by David McCullough <davidm@snapgear.com>
- */
-
-/*
- * entry.S
- * include exception/interrupt gateway
- * system call entry
- */
-
-#include <linux/sys.h>
-#include <asm/unistd.h>
-#include <asm/setup.h>
-#include <asm/segment.h>
-#include <asm/linkage.h>
-#include <asm/asm-offsets.h>
-#include <asm/thread_info.h>
-#include <asm/errno.h>
-
- .h8300s
-
-/* CPU context save/restore macros. */
-
- .macro SAVE_ALL
- mov.l er0,@-sp
-
- stc ccr,r0l /* check kernel mode */
- btst #4,r0l
- bne 5f
-
- /* user mode */
- mov.l sp,@SYMBOL_NAME(sw_usp)
- mov.l @sp,er0 /* restore saved er0 */
- orc #0x10,ccr /* switch kernel stack */
- mov.l @SYMBOL_NAME(sw_ksp),sp
- sub.l #(LRET-LORIG),sp /* allocate LORIG - LRET */
- stm.l er0-er3,@-sp
- mov.l @SYMBOL_NAME(sw_usp),er0
- mov.l @(10:16,er0),er1 /* copy the RET addr */
- mov.l er1,@(LRET-LER3:16,sp)
- mov.w @(8:16,er0),r1
- mov.w r1,@(LEXR-LER3:16,sp) /* copy EXR */
-
- mov.w e1,r1 /* e1 highbyte = ccr */
- and #0xef,r1h /* mask mode? flag */
- sub.w r0,r0
- mov.b r1h,r0l
- mov.w r0,@(LCCR-LER3:16,sp) /* copy ccr */
- mov.l @(LORIG-LER3:16,sp),er0
- mov.l er0,@(LER0-LER3:16,sp) /* copy ER0 */
- bra 6f
-5:
- /* kernel mode */
- mov.l @sp,er0 /* restore saved er0 */
- subs #2,sp /* set dummy ccr */
- stm.l er0-er3,@-sp
- mov.w @(LRET-LER3:16,sp),r1 /* copy old ccr */
- mov.b r1h,r1l
- mov.b #0,r1h
- mov.w r1,@(LCCR-LER3:16,sp)
-6:
- mov.l er6,@-sp /* syscall arg #6 */
- mov.l er5,@-sp /* syscall arg #5 */
- mov.l er4,@-sp /* syscall arg #4 */
- .endm
-
- .macro RESTORE_ALL
- mov.l @sp+,er4
- mov.l @sp+,er5
- mov.l @sp+,er6
- ldm.l @sp+,er2-er3
- mov.w @(LCCR-LER1:16,sp),r0 /* check kernel mode */
- btst #4,r0l
- bne 7f
-
- orc #0x80,ccr
- mov.l @SYMBOL_NAME(sw_usp),er0
- mov.l @(LER0-LER1:16,sp),er1 /* restore ER0 */
- mov.l er1,@er0
- mov.w @(LEXR-LER1:16,sp),r1 /* restore EXR */
- mov.b r1l,r1h
- mov.w r1,@(8:16,er0)
- mov.w @(LCCR-LER1:16,sp),r1 /* restore the RET addr */
- mov.b r1l,r1h
- mov.b @(LRET+1-LER1:16,sp),r1l
- mov.w r1,e1
- mov.w @(LRET+2-LER1:16,sp),r1
- mov.l er1,@(10:16,er0)
-
- mov.l @sp+,er1
- add.l #(LRET-LER1),sp /* remove LORIG - LRET */
- mov.l sp,@SYMBOL_NAME(sw_ksp)
- andc #0xef,ccr /* switch to user mode */
- mov.l er0,sp
- bra 8f
-7:
- mov.l @sp+,er1
- adds #4,sp
- adds #2,sp
-8:
- mov.l @sp+,er0
- adds #4,sp /* remove the sw created LVEC */
- rte
- .endm
-
-.globl SYMBOL_NAME(system_call)
-.globl SYMBOL_NAME(ret_from_exception)
-.globl SYMBOL_NAME(ret_from_fork)
-.globl SYMBOL_NAME(ret_from_interrupt)
-.globl SYMBOL_NAME(interrupt_redirect_table)
-.globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
-.globl SYMBOL_NAME(resume)
-.globl SYMBOL_NAME(trace_break)
-.globl SYMBOL_NAME(interrupt_entry)
-
-INTERRUPTS = 128
-#if defined(CONFIG_ROMKERNEL)
- .section .int_redirect,"ax"
-SYMBOL_NAME_LABEL(interrupt_redirect_table)
- .rept 7
- .long 0
- .endr
- jsr @SYMBOL_NAME(interrupt_entry) /* NMI */
- jmp @SYMBOL_NAME(system_call) /* TRAPA #0 (System call) */
- .long 0
- .long 0
- jmp @SYMBOL_NAME(trace_break) /* TRAPA #3 (breakpoint) */
- .rept INTERRUPTS-12
- jsr @SYMBOL_NAME(interrupt_entry)
- .endr
-#endif
-#if defined(CONFIG_RAMKERNEL)
-.globl SYMBOL_NAME(interrupt_redirect_table)
- .section .bss
-SYMBOL_NAME_LABEL(interrupt_redirect_table)
- .space 4
-#endif
-
- .section .text
- .align 2
-SYMBOL_NAME_LABEL(interrupt_entry)
- SAVE_ALL
- mov.w @(LCCR,sp),r0
- btst #4,r0l
- bne 1f
- mov.l @SYMBOL_NAME(sw_usp),er0
- mov.l @(4:16,er0),er0
- bra 2f
-1:
- mov.l @(LVEC:16,sp),er0
-2:
-#if defined(CONFIG_ROMKERNEL)
- sub.l #SYMBOL_NAME(interrupt_redirect_table),er0
-#endif
-#if defined(CONFIG_RAMKERNEL)
- mov.l @SYMBOL_NAME(interrupt_redirect_table),er1
- sub.l er1,er0
-#endif
- shlr.l #2,er0
- dec.l #1,er0
- mov.l sp,er1
- subs #4,er1 /* adjust ret_pc */
- jsr @SYMBOL_NAME(process_int)
- mov.l @SYMBOL_NAME(irq_stat)+CPUSTAT_SOFTIRQ_PENDING,er0
- beq 1f
- jsr @SYMBOL_NAME(do_softirq)
-1:
- jmp @SYMBOL_NAME(ret_from_exception)
-
-SYMBOL_NAME_LABEL(system_call)
- subs #4,sp /* dummy LVEC */
- SAVE_ALL
- mov.l er0,er4
- mov.l #-ENOSYS,er0
- mov.l er0,@(LER0:16,sp)
-
- /* save top of frame */
- mov.l sp,er0
- jsr @SYMBOL_NAME(set_esp0)
- cmp.l #NR_syscalls,er4
- bcc SYMBOL_NAME(ret_from_exception):16
- shll.l #2,er4
- mov.l #SYMBOL_NAME(sys_call_table),er0
- add.l er4,er0
- mov.l @er0,er0
- mov.l er0,er4
- beq SYMBOL_NAME(ret_from_exception):16
- mov.l sp,er2
- and.w #0xe000,r2
- mov.b @((TASK_FLAGS+3-(TIF_SYSCALL_TRACE >> 3)):16,er2),r2l
- btst #(TIF_SYSCALL_TRACE & 7),r2l
- mov.l @(LER1:16,sp),er0
- mov.l @(LER2:16,sp),er1
- mov.l @(LER3:16,sp),er2
- andc #0x7f,ccr
- jsr @er4
- mov.l er0,@(LER0:16,sp) /* save the return value */
-#if defined(CONFIG_SYSCALL_PRINT)
- jsr @SYMBOL_NAME(syscall_print)
-#endif
- bra SYMBOL_NAME(ret_from_exception):8
-1:
- jsr SYMBOL_NAME(syscall_trace)
- mov.l @(LER1:16,sp),er0
- mov.l @(LER2:16,sp),er1
- mov.l @(LER3:16,sp),er2
- jsr @er4
- mov.l er0,@(LER0:16,sp) /* save the return value */
- jsr @SYMBOL_NAME(syscall_trace)
- bra SYMBOL_NAME(ret_from_exception):8
-
-SYMBOL_NAME_LABEL(ret_from_fork)
- mov.l er2,er0
- jsr @SYMBOL_NAME(schedule_tail)
- bra SYMBOL_NAME(ret_from_exception):8
-
-SYMBOL_NAME_LABEL(reschedule)
- /* save top of frame */
- mov.l sp,er0
- jsr @SYMBOL_NAME(set_esp0)
- jsr @SYMBOL_NAME(schedule)
-
-SYMBOL_NAME_LABEL(ret_from_exception)
-#if defined(CONFIG_PREEMPT)
- orc #0x80,ccr
-#endif
-SYMBOL_NAME_LABEL(ret_from_interrupt)
- mov.b @(LCCR+1:16,sp),r0l
- btst #4,r0l /* check if returning to kernel */
- bne done:8 /* if so, skip resched, signals */
- andc #0x7f,ccr
- mov.l sp,er4
- and.w #0xe000,r4
- mov.l @(TI_FLAGS:16,er4),er1
- and.l #_TIF_WORK_MASK,er1
- beq done:8
-1:
- mov.l @(TI_FLAGS:16,er4),er1
- btst #TIF_NEED_RESCHED,r1l
- bne SYMBOL_NAME(reschedule):16
- mov.l sp,er0
- subs #4,er0 /* adjust retpc */
- mov.l er2,er1
- jsr @SYMBOL_NAME(do_signal)
-#if defined(CONFIG_PREEMPT)
- bra done:8 /* userspace thoru */
-3:
- btst #4,r0l
- beq done:8 /* userspace thoru */
-4:
- mov.l @(TI_PRE_COUNT:16,er4),er1
- bne done:8
- mov.l @(TI_FLAGS:16,er4),er1
- btst #TIF_NEED_RESCHED,r1l
- beq done:8
- mov.b r0l,r0l
- bpl done:8 /* interrupt off (exception path?) */
- mov.l #PREEMPT_ACTIVE,er1
- mov.l er1,@(TI_PRE_COUNT:16,er4)
- andc #0x7f,ccr
- jsr @SYMBOL_NAME(schedule)
- sub.l er1,er1
- mov.l er1,@(TI_PRE_COUNT:16,er4)
- orc #0x80,ccr
- bra 4b:8
-#endif
-done:
- RESTORE_ALL /* Does RTE */
-
-SYMBOL_NAME_LABEL(resume)
- /*
- * er0 = prev
- * er1 = next
- * return last in er2
- */
-
- /* save sr */
- sub.w r3,r3
- stc ccr,r3l
- stc exr,r3h
- mov.w r3,@(THREAD_CCR+2:16,er0)
-
- /* disable interrupts */
- orc #0x80,ccr
- mov.l @SYMBOL_NAME(sw_usp),er3
- mov.l er3,@(THREAD_USP:16,er0)
- mov.l sp,@(THREAD_KSP:16,er0)
-
- /* Skip address space switching if they are the same. */
- /* FIXME: what did we hack out of here, this does nothing! */
-
- mov.l @(THREAD_USP:16,er1),er0
- mov.l er0,@SYMBOL_NAME(sw_usp)
- mov.l @(THREAD_KSP:16,er1),sp
-
- /* restore status register */
- mov.w @(THREAD_CCR+2:16,er1),r3
-
- ldc r3l,ccr
- ldc r3h,exr
-
- rts
-
-SYMBOL_NAME_LABEL(trace_break)
- subs #4,sp /* dummy LVEC */
- SAVE_ALL
- sub.l er1,er1
- dec.l #1,er1
- mov.l er1,@(LORIG,sp)
- mov.l sp,er0
- jsr @SYMBOL_NAME(set_esp0)
- mov.l @SYMBOL_NAME(sw_usp),er0
- mov.l @er0,er1
- subs #2,er1
- mov.l er1,@er0
- and.w #0xff,e1
- mov.l er1,er0
- jsr @SYMBOL_NAME(trace_trap)
- jmp @SYMBOL_NAME(ret_from_exception)
-
- .section .bss
-SYMBOL_NAME_LABEL(sw_ksp)
- .space 4
-SYMBOL_NAME_LABEL(sw_usp)
- .space 4
Code Review / linux-2.6.git / blobdiff