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240 lines
5.5 KiB
240 lines
5.5 KiB
/* |
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* entry.S -- non-mmu 68000 interrupt and exception entry points |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file README.legal in the main directory of this archive |
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* for more details. |
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* |
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* Linux/m68k support by Hamish Macdonald |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/thread_info.h> |
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#include <asm/unistd.h> |
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#include <asm/errno.h> |
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#include <asm/setup.h> |
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#include <asm/traps.h> |
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#include <asm/asm-offsets.h> |
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#include <asm/entry.h> |
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.text |
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.globl system_call |
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.globl resume |
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.globl ret_from_exception |
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.globl sys_call_table |
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.globl bad_interrupt |
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.globl inthandler1 |
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.globl inthandler2 |
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.globl inthandler3 |
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.globl inthandler4 |
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.globl inthandler5 |
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.globl inthandler6 |
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.globl inthandler7 |
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badsys: |
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movel #-ENOSYS,%sp@(PT_OFF_D0) |
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jra ret_from_exception |
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do_trace: |
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movel #-ENOSYS,%sp@(PT_OFF_D0) /* needed for strace*/ |
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subql #4,%sp |
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SAVE_SWITCH_STACK |
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jbsr syscall_trace_enter |
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RESTORE_SWITCH_STACK |
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addql #4,%sp |
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movel %sp@(PT_OFF_ORIG_D0),%d1 |
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movel #-ENOSYS,%d0 |
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cmpl #NR_syscalls,%d1 |
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jcc 1f |
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lsl #2,%d1 |
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lea sys_call_table, %a0 |
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jbsr %a0@(%d1) |
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1: movel %d0,%sp@(PT_OFF_D0) /* save the return value */ |
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subql #4,%sp /* dummy return address */ |
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SAVE_SWITCH_STACK |
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jbsr syscall_trace_leave |
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RESTORE_SWITCH_STACK |
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addql #4,%sp |
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jra ret_from_exception |
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ENTRY(system_call) |
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SAVE_ALL_SYS |
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/* save top of frame*/ |
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pea %sp@ |
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jbsr set_esp0 |
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addql #4,%sp |
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movel %sp@(PT_OFF_ORIG_D0),%d0 |
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movel %sp,%d1 /* get thread_info pointer */ |
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andl #-THREAD_SIZE,%d1 |
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movel %d1,%a2 |
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btst #(TIF_SYSCALL_TRACE%8),%a2@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8) |
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jne do_trace |
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cmpl #NR_syscalls,%d0 |
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jcc badsys |
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lsl #2,%d0 |
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lea sys_call_table,%a0 |
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movel %a0@(%d0), %a0 |
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jbsr %a0@ |
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movel %d0,%sp@(PT_OFF_D0) /* save the return value*/ |
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ret_from_exception: |
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btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel*/ |
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jeq Luser_return /* if so, skip resched, signals*/ |
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Lkernel_return: |
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RESTORE_ALL |
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Luser_return: |
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/* only allow interrupts when we are really the last one on the*/ |
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/* kernel stack, otherwise stack overflow can occur during*/ |
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/* heavy interrupt load*/ |
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andw #ALLOWINT,%sr |
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movel %sp,%d1 /* get thread_info pointer */ |
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andl #-THREAD_SIZE,%d1 |
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movel %d1,%a2 |
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1: |
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move %a2@(TINFO_FLAGS),%d1 /* thread_info->flags */ |
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jne Lwork_to_do |
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RESTORE_ALL |
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Lwork_to_do: |
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movel %a2@(TINFO_FLAGS),%d1 /* thread_info->flags */ |
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btst #TIF_NEED_RESCHED,%d1 |
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jne reschedule |
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Lsignal_return: |
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subql #4,%sp /* dummy return address*/ |
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SAVE_SWITCH_STACK |
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pea %sp@(SWITCH_STACK_SIZE) |
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bsrw do_notify_resume |
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addql #4,%sp |
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RESTORE_SWITCH_STACK |
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addql #4,%sp |
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jra 1b |
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/* |
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* This is the main interrupt handler, responsible for calling process_int() |
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*/ |
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inthandler1: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #65,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler2: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #66,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler3: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #67,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler4: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #68,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler5: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #69,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler6: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #70,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler7: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel #71,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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inthandler: |
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SAVE_ALL_INT |
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movew %sp@(PT_OFF_FORMATVEC), %d0 |
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and #0x3ff, %d0 |
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movel %sp,%sp@- |
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movel %d0,%sp@- /* put vector # on stack*/ |
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jbsr process_int /* process the IRQ*/ |
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3: addql #8,%sp /* pop parameters off stack*/ |
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bra ret_from_exception |
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/* |
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* Handler for uninitialized and spurious interrupts. |
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*/ |
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ENTRY(bad_interrupt) |
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addql #1,irq_err_count |
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rte |
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/* |
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* Beware - when entering resume, prev (the current task) is |
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* in a0, next (the new task) is in a1, so don't change these |
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* registers until their contents are no longer needed. |
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*/ |
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ENTRY(resume) |
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movel %a0,%d1 /* save prev thread in d1 */ |
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movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */ |
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SAVE_SWITCH_STACK |
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movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ |
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movel %usp,%a3 /* save usp */ |
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movel %a3,%a0@(TASK_THREAD+THREAD_USP) |
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movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore user stack */ |
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movel %a3,%usp |
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movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ |
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RESTORE_SWITCH_STACK |
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movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ |
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rts |
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