| /* |
| * linux/arch/m68knommu/platform/68328/entry.S |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file README.legal in the main directory of this archive |
| * for more details. |
| * |
| * Linux/m68k support by Hamish Macdonald |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/sys.h> |
| #include <linux/linkage.h> |
| #include <asm/thread_info.h> |
| #include <asm/unistd.h> |
| #include <asm/errno.h> |
| #include <asm/setup.h> |
| #include <asm/segment.h> |
| #include <asm/traps.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/entry.h> |
| |
| .text |
| |
| .globl system_call |
| .globl resume |
| .globl ret_from_exception |
| .globl ret_from_signal |
| .globl sys_call_table |
| .globl ret_from_interrupt |
| .globl bad_interrupt |
| .globl inthandler1 |
| .globl inthandler2 |
| .globl inthandler3 |
| .globl inthandler4 |
| .globl inthandler5 |
| .globl inthandler6 |
| .globl inthandler7 |
| |
| badsys: |
| movel #-ENOSYS,%sp@(PT_D0) |
| jra ret_from_exception |
| |
| do_trace: |
| movel #-ENOSYS,%sp@(PT_D0) /* needed for strace*/ |
| subql #4,%sp |
| SAVE_SWITCH_STACK |
| jbsr syscall_trace |
| RESTORE_SWITCH_STACK |
| addql #4,%sp |
| movel %sp@(PT_ORIG_D0),%d1 |
| movel #-ENOSYS,%d0 |
| cmpl #NR_syscalls,%d1 |
| jcc 1f |
| lsl #2,%d1 |
| lea sys_call_table, %a0 |
| jbsr %a0@(%d1) |
| |
| 1: movel %d0,%sp@(PT_D0) /* save the return value */ |
| subql #4,%sp /* dummy return address */ |
| SAVE_SWITCH_STACK |
| jbsr syscall_trace |
| |
| ret_from_signal: |
| RESTORE_SWITCH_STACK |
| addql #4,%sp |
| jra ret_from_exception |
| |
| ENTRY(system_call) |
| SAVE_ALL |
| |
| /* save top of frame*/ |
| pea %sp@ |
| jbsr set_esp0 |
| addql #4,%sp |
| |
| movel %sp@(PT_ORIG_D0),%d0 |
| |
| movel %sp,%d1 /* get thread_info pointer */ |
| andl #0xffffe000,%d1 |
| movel %d1,%a2 |
| btst #TIF_SYSCALL_TRACE,%a2@(TI_FLAGS) |
| jne do_trace |
| cmpl #NR_syscalls,%d0 |
| jcc badsys |
| lsl #2,%d0 |
| lea sys_call_table,%a0 |
| movel %a0@(%d0), %a0 |
| jbsr %a0@ |
| movel %d0,%sp@(PT_D0) /* save the return value*/ |
| |
| ret_from_exception: |
| btst #5,%sp@(PT_SR) /* check if returning to kernel*/ |
| jeq Luser_return /* if so, skip resched, signals*/ |
| |
| Lkernel_return: |
| RESTORE_ALL |
| |
| Luser_return: |
| /* only allow interrupts when we are really the last one on the*/ |
| /* kernel stack, otherwise stack overflow can occur during*/ |
| /* heavy interrupt load*/ |
| andw #ALLOWINT,%sr |
| |
| movel %sp,%d1 /* get thread_info pointer */ |
| andl #0xffffe000,%d1 |
| movel %d1,%a2 |
| move %a2@(TI_FLAGS),%d1 /* thread_info->flags */ |
| andl #_TIF_WORK_MASK,%d1 |
| jne Lwork_to_do |
| RESTORE_ALL |
| |
| Lwork_to_do: |
| movel %a2@(TI_FLAGS),%d1 /* thread_info->flags */ |
| btst #TIF_NEED_RESCHED,%d1 |
| jne reschedule |
| |
| Lsignal_return: |
| subql #4,%sp /* dummy return address*/ |
| SAVE_SWITCH_STACK |
| pea %sp@(SWITCH_STACK_SIZE) |
| clrl %sp@- |
| bsrw do_signal |
| addql #8,%sp |
| RESTORE_SWITCH_STACK |
| addql #4,%sp |
| Lreturn: |
| RESTORE_ALL |
| |
| /* |
| * This is the main interrupt handler, responsible for calling process_int() |
| */ |
| inthandler1: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #65,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler2: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #66,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler3: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #67,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler4: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #68,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler5: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #69,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler6: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #70,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler7: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel #71,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| inthandler: |
| SAVE_ALL |
| addql #1,local_irq_count /* put exception # in d0*/ |
| movew %sp@(PT_VECTOR), %d0 |
| and #0x3ff, %d0 |
| |
| movel %sp,%sp@- |
| movel %d0,%sp@- /* put vector # on stack*/ |
| jbsr process_int /* process the IRQ*/ |
| 3: addql #8,%sp /* pop parameters off stack*/ |
| bra ret_from_interrupt |
| |
| ret_from_interrupt: |
| subql #1,local_irq_count |
| jeq 1f |
| 2: |
| RESTORE_ALL |
| 1: |
| moveb %sp@(PT_SR), %d0 |
| and #7, %d0 |
| jhi 2b |
| |
| /* check if we need to do software interrupts */ |
| movel local_irq_count,%d0 |
| jeq ret_from_exception |
| |
| pea ret_from_exception |
| jra do_softirq |
| |
| |
| /* |
| * Handler for uninitialized and spurious interrupts. |
| */ |
| ENTRY(bad_interrupt) |
| addql #1,num_spurious |
| rte |
| |
| /* |
| * Beware - when entering resume, prev (the current task) is |
| * in a0, next (the new task) is in a1,so don't change these |
| * registers until their contents are no longer needed. |
| */ |
| ENTRY(resume) |
| movel %a0,%d1 /* save prev thread in d1 */ |
| movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */ |
| movel %usp,%a2 /* save usp */ |
| movel %a2,%a0@(TASK_THREAD+THREAD_USP) |
| |
| SAVE_SWITCH_STACK |
| movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ |
| movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ |
| RESTORE_SWITCH_STACK |
| |
| movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */ |
| movel %a0,%usp |
| movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ |
| rts |
| |
