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@@ -1,5 +1,451 @@
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-#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
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-#include "entry_mm.S"
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+/* -*- mode: asm -*-
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+ *
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+ * linux/arch/m68k/kernel/entry.S
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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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+ * 68060 fixes by Jesper Skov
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+ *
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+ */
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+
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+/*
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+ * entry.S contains the system-call and fault low-level handling routines.
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+ * This also contains the timer-interrupt handler, as well as all interrupts
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+ * and faults that can result in a task-switch.
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+ *
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+ * NOTE: This code handles signal-recognition, which happens every time
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+ * after a timer-interrupt and after each system call.
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+ *
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+ */
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+
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+/*
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+ * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so
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+ * all pointers that used to be 'current' are now entry
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+ * number 0 in the 'current_set' list.
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+ *
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+ * 6/05/00 RZ: addedd writeback completion after return from sighandler
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+ * for 68040
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+ */
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+
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+#include <linux/linkage.h>
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+#include <asm/errno.h>
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+#include <asm/setup.h>
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+#include <asm/segment.h>
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+#include <asm/traps.h>
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+#include <asm/unistd.h>
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+#include <asm/asm-offsets.h>
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+#include <asm/entry.h>
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+
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+.globl system_call, buserr, trap, resume
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+.globl sys_call_table
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+.globl sys_fork, sys_clone, sys_vfork
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+.globl ret_from_interrupt, bad_interrupt
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+.globl auto_irqhandler_fixup
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+.globl user_irqvec_fixup
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+
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+.text
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+ENTRY(sys_fork)
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+ SAVE_SWITCH_STACK
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+ pea %sp@(SWITCH_STACK_SIZE)
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+ jbsr m68k_fork
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+ addql #4,%sp
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+ RESTORE_SWITCH_STACK
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+ rts
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+
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+ENTRY(sys_clone)
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+ SAVE_SWITCH_STACK
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+ pea %sp@(SWITCH_STACK_SIZE)
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+ jbsr m68k_clone
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+ addql #4,%sp
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+ RESTORE_SWITCH_STACK
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+ rts
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+
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+ENTRY(sys_vfork)
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+ SAVE_SWITCH_STACK
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+ pea %sp@(SWITCH_STACK_SIZE)
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+ jbsr m68k_vfork
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+ addql #4,%sp
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+ RESTORE_SWITCH_STACK
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+ rts
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+
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+ENTRY(sys_sigreturn)
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+ SAVE_SWITCH_STACK
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+ jbsr do_sigreturn
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+ RESTORE_SWITCH_STACK
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+ rts
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+
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+ENTRY(sys_rt_sigreturn)
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+ SAVE_SWITCH_STACK
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+ jbsr do_rt_sigreturn
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+ RESTORE_SWITCH_STACK
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+ rts
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+
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+ENTRY(buserr)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %sp,%sp@- | stack frame pointer argument
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+ jbsr buserr_c
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+ addql #4,%sp
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+ jra ret_from_exception
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+
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+ENTRY(trap)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %sp,%sp@- | stack frame pointer argument
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+ jbsr trap_c
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+ addql #4,%sp
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+ jra ret_from_exception
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+
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+ | After a fork we jump here directly from resume,
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+ | so that %d1 contains the previous task
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+ | schedule_tail now used regardless of CONFIG_SMP
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+ENTRY(ret_from_fork)
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+ movel %d1,%sp@-
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+ jsr schedule_tail
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+ addql #4,%sp
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+ jra ret_from_exception
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+
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+#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
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+
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+#ifdef TRAP_DBG_INTERRUPT
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+
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+.globl dbginterrupt
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+ENTRY(dbginterrupt)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %sp,%sp@- /* stack frame pointer argument */
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+ jsr dbginterrupt_c
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+ addql #4,%sp
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+ jra ret_from_exception
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+#endif
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+
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+ENTRY(reschedule)
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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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+ pea ret_from_exception
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+ jmp schedule
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+
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+ENTRY(ret_from_user_signal)
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+ moveq #__NR_sigreturn,%d0
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+ trap #0
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+
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+ENTRY(ret_from_user_rt_signal)
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+ movel #__NR_rt_sigreturn,%d0
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+ trap #0
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+
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#else
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-#include "entry_no.S"
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+
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+do_trace_entry:
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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
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+ RESTORE_SWITCH_STACK
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+ addql #4,%sp
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+ movel %sp@(PT_OFF_ORIG_D0),%d0
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+ cmpl #NR_syscalls,%d0
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+ jcs syscall
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+badsys:
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+ movel #-ENOSYS,%sp@(PT_OFF_D0)
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+ jra ret_from_syscall
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+
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+do_trace_exit:
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+ subql #4,%sp
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+ SAVE_SWITCH_STACK
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+ jbsr syscall_trace
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+ RESTORE_SWITCH_STACK
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+ addql #4,%sp
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+ jra .Lret_from_exception
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+
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+ENTRY(ret_from_signal)
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+ movel %curptr@(TASK_STACK),%a1
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+ tstb %a1@(TINFO_FLAGS+2)
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+ jge 1f
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+ jbsr syscall_trace
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+1: RESTORE_SWITCH_STACK
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+ addql #4,%sp
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+/* on 68040 complete pending writebacks if any */
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+#ifdef CONFIG_M68040
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+ bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
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+ subql #7,%d0 | bus error frame ?
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+ jbne 1f
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+ movel %sp,%sp@-
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+ jbsr berr_040cleanup
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+ addql #4,%sp
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+1:
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+#endif
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+ jra .Lret_from_exception
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+
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+ENTRY(system_call)
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+ SAVE_ALL_SYS
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+
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+ GET_CURRENT(%d1)
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+ movel %d1,%a1
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+
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+ | save top of frame
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+ movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
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+
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+ | syscall trace?
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+ tstb %a1@(TINFO_FLAGS+2)
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+ jmi do_trace_entry
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+ cmpl #NR_syscalls,%d0
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+ jcc badsys
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+syscall:
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+ jbsr @(sys_call_table,%d0:l:4)@(0)
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+ movel %d0,%sp@(PT_OFF_D0) | save the return value
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+ret_from_syscall:
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+ |oriw #0x0700,%sr
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+ movel %curptr@(TASK_STACK),%a1
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+ movew %a1@(TINFO_FLAGS+2),%d0
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+ jne syscall_exit_work
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+1: RESTORE_ALL
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+
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+syscall_exit_work:
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+ btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
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+ bnes 1b | if so, skip resched, signals
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+ lslw #1,%d0
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+ jcs do_trace_exit
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+ jmi do_delayed_trace
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+ lslw #8,%d0
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+ jne do_signal_return
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+ pea resume_userspace
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+ jra schedule
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+
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+
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+ENTRY(ret_from_exception)
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+.Lret_from_exception:
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+ btst #5,%sp@(PT_OFF_SR) | check if returning to kernel
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+ bnes 1f | if so, skip resched, signals
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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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+
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+resume_userspace:
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+ movel %curptr@(TASK_STACK),%a1
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+ moveb %a1@(TINFO_FLAGS+3),%d0
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+ jne exit_work
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+1: RESTORE_ALL
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+
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+exit_work:
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+ | save top of frame
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+ movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0)
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+ lslb #1,%d0
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+ jne do_signal_return
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+ pea resume_userspace
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+ jra schedule
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+
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+
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+do_signal_return:
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+ |andw #ALLOWINT,%sr
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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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+ bsrl 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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+ jbra resume_userspace
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+
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+do_delayed_trace:
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+ bclr #7,%sp@(PT_OFF_SR) | clear trace bit in SR
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+ pea 1 | send SIGTRAP
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+ movel %curptr,%sp@-
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+ pea LSIGTRAP
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+ jbsr send_sig
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+ addql #8,%sp
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+ addql #4,%sp
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+ jbra resume_userspace
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+
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+
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+/* This is the main interrupt handler for autovector interrupts */
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+
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+ENTRY(auto_inthandler)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %d0,%a1
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+ addqb #1,%a1@(TINFO_PREEMPT+1)
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+ | put exception # in d0
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+ bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
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+ subw #VEC_SPUR,%d0
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+
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+ movel %sp,%sp@-
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+ movel %d0,%sp@- | put vector # on stack
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+auto_irqhandler_fixup = . + 2
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+ jsr do_IRQ | process the IRQ
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+ addql #8,%sp | pop parameters off stack
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+
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+ret_from_interrupt:
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+ movel %curptr@(TASK_STACK),%a1
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+ subqb #1,%a1@(TINFO_PREEMPT+1)
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+ jeq ret_from_last_interrupt
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+2: RESTORE_ALL
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+
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+ ALIGN
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+ret_from_last_interrupt:
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+ moveq #(~ALLOWINT>>8)&0xff,%d0
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+ andb %sp@(PT_OFF_SR),%d0
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+ jne 2b
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+
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+ /* check if we need to do software interrupts */
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+ tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
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+ jeq .Lret_from_exception
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+ pea ret_from_exception
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+ jra do_softirq
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+
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+/* Handler for user defined interrupt vectors */
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+
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+ENTRY(user_inthandler)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %d0,%a1
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+ addqb #1,%a1@(TINFO_PREEMPT+1)
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+ | put exception # in d0
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+ bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
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+user_irqvec_fixup = . + 2
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+ subw #VEC_USER,%d0
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+
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+ movel %sp,%sp@-
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+ movel %d0,%sp@- | put vector # on stack
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+ jsr do_IRQ | process the IRQ
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+ addql #8,%sp | pop parameters off stack
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+
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+ movel %curptr@(TASK_STACK),%a1
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+ subqb #1,%a1@(TINFO_PREEMPT+1)
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+ jeq ret_from_last_interrupt
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+ RESTORE_ALL
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+
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+/* Handler for uninitialized and spurious interrupts */
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+
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+ENTRY(bad_inthandler)
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+ SAVE_ALL_INT
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+ GET_CURRENT(%d0)
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+ movel %d0,%a1
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+ addqb #1,%a1@(TINFO_PREEMPT+1)
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+
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+ movel %sp,%sp@-
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+ jsr handle_badint
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+ addql #4,%sp
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+
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+ movel %curptr@(TASK_STACK),%a1
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+ subqb #1,%a1@(TINFO_PREEMPT+1)
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+ jeq ret_from_last_interrupt
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+ RESTORE_ALL
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+
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+
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+resume:
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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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+
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+ /* save sr */
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+ movew %sr,%a0@(TASK_THREAD+THREAD_SR)
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+
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+ /* save fs (sfc,%dfc) (may be pointing to kernel memory) */
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+ movec %sfc,%d0
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+ movew %d0,%a0@(TASK_THREAD+THREAD_FS)
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+
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+ /* save usp */
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+ /* it is better to use a movel here instead of a movew 8*) */
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+ movec %usp,%d0
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+ movel %d0,%a0@(TASK_THREAD+THREAD_USP)
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+
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+ /* save non-scratch registers on stack */
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+ SAVE_SWITCH_STACK
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+
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+ /* save current kernel stack pointer */
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+ movel %sp,%a0@(TASK_THREAD+THREAD_KSP)
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+
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+ /* save floating point context */
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+#ifndef CONFIG_M68KFPU_EMU_ONLY
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+#ifdef CONFIG_M68KFPU_EMU
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+ tstl m68k_fputype
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+ jeq 3f
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+#endif
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+ fsave %a0@(TASK_THREAD+THREAD_FPSTATE)
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+
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+#if defined(CONFIG_M68060)
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+#if !defined(CPU_M68060_ONLY)
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+ btst #3,m68k_cputype+3
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+ beqs 1f
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+#endif
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+ /* The 060 FPU keeps status in bits 15-8 of the first longword */
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+ tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2)
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+ jeq 3f
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+#if !defined(CPU_M68060_ONLY)
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+ jra 2f
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+#endif
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+#endif /* CONFIG_M68060 */
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+#if !defined(CPU_M68060_ONLY)
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+1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE)
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+ jeq 3f
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+#endif
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+2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG)
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+ fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL)
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+3:
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+#endif /* CONFIG_M68KFPU_EMU_ONLY */
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+ /* Return previous task in %d1 */
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+ movel %curptr,%d1
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+
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+ /* switch to new task (a1 contains new task) */
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+ movel %a1,%curptr
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+
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+ /* restore floating point context */
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+#ifndef CONFIG_M68KFPU_EMU_ONLY
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+#ifdef CONFIG_M68KFPU_EMU
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+ tstl m68k_fputype
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+ jeq 4f
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+#endif
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+#if defined(CONFIG_M68060)
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+#if !defined(CPU_M68060_ONLY)
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+ btst #3,m68k_cputype+3
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+ beqs 1f
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+#endif
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+ /* The 060 FPU keeps status in bits 15-8 of the first longword */
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+ tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2)
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+ jeq 3f
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+#if !defined(CPU_M68060_ONLY)
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+ jra 2f
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|
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+#endif
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|
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+#endif /* CONFIG_M68060 */
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|
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+#if !defined(CPU_M68060_ONLY)
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+1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE)
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|
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+ jeq 3f
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|
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#endif
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|
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+2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7
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|
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+ fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar
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|
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+3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE)
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|
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+4:
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|
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+#endif /* CONFIG_M68KFPU_EMU_ONLY */
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|
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+
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|
|
+ /* restore the kernel stack pointer */
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|
|
+ movel %a1@(TASK_THREAD+THREAD_KSP),%sp
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|
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+
|
|
|
+ /* restore non-scratch registers */
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|
|
+ RESTORE_SWITCH_STACK
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|
|
+
|
|
|
+ /* restore user stack pointer */
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|
|
+ movel %a1@(TASK_THREAD+THREAD_USP),%a0
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|
|
+ movel %a0,%usp
|
|
|
+
|
|
|
+ /* restore fs (sfc,%dfc) */
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|
|
+ movew %a1@(TASK_THREAD+THREAD_FS),%a0
|
|
|
+ movec %a0,%sfc
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|
|
+ movec %a0,%dfc
|
|
|
+
|
|
|
+ /* restore status register */
|
|
|
+ movew %a1@(TASK_THREAD+THREAD_SR),%sr
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|
|
+
|
|
|
+ rts
|
|
|
+
|
|
|
+#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
|
Greg Ungerer