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https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable.git
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9fde034864
Add a m68k-only set_fc helper to set the SFC and DFC registers for the few places that need to override it for special MM operations, but disconnect that from the deprecated kernel-wide set_fs() API. Note that the SFC/DFC registers are context switched, so there is no need to disable preemption. Partially based on an earlier patch from Linus Torvalds <torvalds@linux-foundation.org>. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Michael Schmitz <schmitzmic@gmail.com> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Link: https://lore.kernel.org/r/20210916070405.52750-7-hch@lst.de Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
241 lines
5.5 KiB
ArmAsm
241 lines
5.5 KiB
ArmAsm
/*
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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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