/* -*- mode: asm -*- * * linux/arch/m68k/kernel/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 * * 68060 fixes by Jesper Skov * */ /* * entry.S contains the system-call and fault low-level handling routines. * This also contains the timer-interrupt handler, as well as all interrupts * and faults that can result in a task-switch. * * NOTE: This code handles signal-recognition, which happens every time * after a timer-interrupt and after each system call. * */ /* * 12/03/96 Jes: Currently we only support m68k single-cpu systems, so * all pointers that used to be 'current' are now entry * number 0 in the 'current_set' list. */ #include #include #include #include #include #include #include #include #include "m68k_defs.h" .globl SYMBOL_NAME(system_call), SYMBOL_NAME(buserr), SYMBOL_NAME(trap) .globl SYMBOL_NAME(resume), SYMBOL_NAME(ret_from_exception) .globl SYMBOL_NAME(ret_from_signal) .globl SYMBOL_NAME(inthandler), SYMBOL_NAME(sys_call_table) .globl SYMBOL_NAME(sys_fork), SYMBOL_NAME(sys_clone), SYMBOL_NAME(sys_vfork) .globl SYMBOL_NAME(ret_from_interrupt), SYMBOL_NAME(bad_interrupt) .text ENTRY(buserr) SAVE_ALL_INT GET_CURRENT(%d0) movel %sp,%sp@- | stack frame pointer argument bsrl SYMBOL_NAME(buserr_c) addql #4,%sp jra SYMBOL_NAME(ret_from_exception) ENTRY(trap) SAVE_ALL_INT GET_CURRENT(%d0) movel %sp,%sp@- | stack frame pointer argument bsrl SYMBOL_NAME(trap_c) addql #4,%sp jra SYMBOL_NAME(ret_from_exception) ENTRY(reschedule) | save top of frame movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0) pea SYMBOL_NAME(ret_from_exception) jmp SYMBOL_NAME(schedule) | After a fork we jump here directly from resume, | so that %d1 contains the previous task | Theoretically only needed on SMP, but let's watch | what happens in schedule_tail() in future... ENTRY(ret_from_fork) movel %d1,%sp@- jsr SYMBOL_NAME(schedule_tail) addql #4,%sp jra SYMBOL_NAME(ret_from_exception) badsys: movel #-ENOSYS,PT_D0(%sp) jra SYMBOL_NAME(ret_from_exception) do_trace: movel #-ENOSYS,PT_D0(%sp) | needed for strace subql #4,%sp SAVE_SWITCH_STACK jbsr SYMBOL_NAME(syscall_trace) RESTORE_SWITCH_STACK addql #4,%sp jbsr @(SYMBOL_NAME(sys_call_table),%d2:l:4)@(0) movel %d0,%sp@(PT_D0) | save the return value subql #4,%sp | dummy return address SAVE_SWITCH_STACK jbsr SYMBOL_NAME(syscall_trace) SYMBOL_NAME_LABEL(ret_from_signal) RESTORE_SWITCH_STACK addql #4,%sp jra SYMBOL_NAME(ret_from_exception) ENTRY(system_call) SAVE_ALL_SYS movel %d0,%d2 GET_CURRENT(%d0) | save top of frame movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0) cmpl #NR_syscalls,%d2 jcc badsys btst #PF_TRACESYS_BIT,%curptr@(TASK_FLAGS+PF_TRACESYS_OFF) jne do_trace jbsr @(SYMBOL_NAME(sys_call_table),%d2:l:4)@(0) movel %d0,%sp@(PT_D0) | save the return value SYMBOL_NAME_LABEL(ret_from_exception) btst #5,%sp@(PT_SR) | check if returning to kernel bnes 2f | if so, skip resched, signals | only allow interrupts when we are really the last one on the | kernel stack, otherwise stack overflow can occur during | heavy interupt load andw #ALLOWINT,%sr tstl %curptr@(TASK_NEEDRESCHED) jne SYMBOL_NAME(reschedule) #if 0 cmpl #SYMBOL_NAME(task),%curptr | task[0] cannot have signals jeq 2f #endif | check for delayed trace bclr #PF_DTRACE_BIT,%curptr@(TASK_FLAGS+PF_DTRACE_OFF) jne do_delayed_trace 5: tstl %curptr@(TASK_STATE) | state jne SYMBOL_NAME(reschedule) tstl %curptr@(TASK_SIGPENDING) jne Lsignal_return 2: RESTORE_ALL Lsignal_return: subql #4,%sp | dummy return address SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) clrl %sp@- bsrl SYMBOL_NAME(do_signal) addql #8,%sp RESTORE_SWITCH_STACK addql #4,%sp RESTORE_ALL do_delayed_trace: bclr #7,%sp@(PT_SR) | clear trace bit in SR pea 1 | send SIGTRAP movel %curptr,%sp@- pea LSIGTRAP jbsr SYMBOL_NAME(send_sig) addql #8,%sp addql #4,%sp jra 5b #if 0 #if CONFIG_AMIGA SYMBOL_NAME_LABEL(ami_inthandler) addql #1,SYMBOL_NAME(local_irq_count) SAVE_ALL_INT GET_CURRENT(%d0) bfextu %sp@(PT_VECTOR){#4,#12},%d0 movel %d0,%a0 addql #1,%a0@(SYMBOL_NAME(kstat)+STAT_IRQ-VECOFF(VEC_SPUR)) movel %a0@(SYMBOL_NAME(autoirq_list)-VECOFF(VEC_SPUR)),%a0 | amiga vector int handler get the req mask instead of irq vector lea CUSTOMBASE,%a1 movew %a1@(C_INTREQR),%d0 andw %a1@(C_INTENAR),%d0 | prepare stack (push frame pointer, dev_id & req mask) pea %sp@ movel %a0@(IRQ_DEVID),%sp@- movel %d0,%sp@- pea %pc@(SYMBOL_NAME(ret_from_interrupt):w) jbra @(IRQ_HANDLER,%a0)@(0) ENTRY(nmi_handler) rte #endif #endif /* ** This is the main interrupt handler, responsible for calling process_int() */ SYMBOL_NAME_LABEL(inthandler) SAVE_ALL_INT GET_CURRENT(%d0) addql #1,SYMBOL_NAME(local_irq_count) | put exception # in d0 bfextu %sp@(PT_VECTOR){#4,#10},%d0 movel %sp,%sp@- movel %d0,%sp@- | put vector # on stack #if defined(MACH_Q40_ONLY) && defined(CONFIG_BLK_DEV_FD) btstb #4,0xff000000 | Q40 floppy needs very special treatment ... jbeq 1f btstb #3,0xff000004 jbeq 1f jbsr SYMBOL_NAME(floppy_hardint) jbra 3f 1: #endif jbsr SYMBOL_NAME(process_int)| process the IRQ 3: addql #8,%sp | pop parameters off stack SYMBOL_NAME_LABEL(ret_from_interrupt) subql #1,SYMBOL_NAME(local_irq_count) jeq 1f 2: RESTORE_ALL 1: #if 1 bfextu %sp@(PT_SR){#5,#3},%d0 | Check for nested interrupt. #if MAX_NOINT_IPL > 0 cmpiw #MAX_NOINT_IPL,%d0 #endif jhi 2b #endif /* check if we need to do software interrupts */ movel SYMBOL_NAME(bh_active),%d0 andl SYMBOL_NAME(bh_mask),%d0 jeq SYMBOL_NAME(ret_from_exception) pea SYMBOL_NAME(ret_from_exception) jra SYMBOL_NAME(do_bottom_half) /* Handler for uninitialized and spurious interrupts */ SYMBOL_NAME_LABEL(bad_interrupt) addql #1,SYMBOL_NAME(num_spurious) rte ENTRY(sys_fork) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(m68k_fork) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_clone) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(m68k_clone) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_vfork) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(m68k_vfork) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_sigsuspend) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(do_sigsuspend) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_rt_sigsuspend) SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) jbsr SYMBOL_NAME(do_rt_sigsuspend) addql #4,%sp RESTORE_SWITCH_STACK rts ENTRY(sys_sigreturn) SAVE_SWITCH_STACK jbsr SYMBOL_NAME(do_sigreturn) RESTORE_SWITCH_STACK rts ENTRY(sys_rt_sigreturn) SAVE_SWITCH_STACK jbsr SYMBOL_NAME(do_rt_sigreturn) RESTORE_SWITCH_STACK rts SYMBOL_NAME_LABEL(resume) /* * 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. */ /* save sr */ movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save fs (sfc,%dfc) (may be pointing to kernel memory) */ movec %sfc,%d0 movew %d0,%a0@(TASK_THREAD+THREAD_FS) /* save usp */ /* it is better to use a movel here instead of a movew 8*) */ movec %usp,%d0 movel %d0,%a0@(TASK_THREAD+THREAD_USP) /* save non-scratch registers on stack */ SAVE_SWITCH_STACK /* save current kernel stack pointer */ movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save floating point context */ #ifndef CONFIG_M68KFPU_EMU_ONLY #ifdef CONFIG_M68KFPU_EMU tstl SYMBOL_NAME(m68k_fputype) jeq 3f #endif fsave %a0@(TASK_THREAD+THREAD_FPSTATE) #if defined(CONFIG_M68060) #if !defined(CPU_M68060_ONLY) btst #3,SYMBOL_NAME(m68k_cputype)+3 beqs 1f #endif /* The 060 FPU keeps status in bits 15-8 of the first longword */ tstb %a0@(TASK_THREAD+THREAD_FPSTATE+2) jeq 3f #if !defined(CPU_M68060_ONLY) jra 2f #endif #endif /* CONFIG_M68060 */ #if !defined(CPU_M68060_ONLY) 1: tstb %a0@(TASK_THREAD+THREAD_FPSTATE) jeq 3f #endif 2: fmovemx %fp0-%fp7,%a0@(TASK_THREAD+THREAD_FPREG) fmoveml %fpcr/%fpsr/%fpiar,%a0@(TASK_THREAD+THREAD_FPCNTL) 3: #endif /* CONFIG_M68KFPU_EMU_ONLY */ /* Return previous task in %d1 */ movel %curptr,%d1 /* switch to new task (a1 contains new task) */ movel %a1,%curptr /* restore floating point context */ #ifndef CONFIG_M68KFPU_EMU_ONLY #ifdef CONFIG_M68KFPU_EMU tstl SYMBOL_NAME(m68k_fputype) jeq 4f #endif #if defined(CONFIG_M68060) #if !defined(CPU_M68060_ONLY) btst #3,SYMBOL_NAME(m68k_cputype)+3 beqs 1f #endif /* The 060 FPU keeps status in bits 15-8 of the first longword */ tstb %a1@(TASK_THREAD+THREAD_FPSTATE+2) jeq 3f #if !defined(CPU_M68060_ONLY) jra 2f #endif #endif /* CONFIG_M68060 */ #if !defined(CPU_M68060_ONLY) 1: tstb %a1@(TASK_THREAD+THREAD_FPSTATE) jeq 3f #endif 2: fmovemx %a1@(TASK_THREAD+THREAD_FPREG),%fp0-%fp7 fmoveml %a1@(TASK_THREAD+THREAD_FPCNTL),%fpcr/%fpsr/%fpiar 3: frestore %a1@(TASK_THREAD+THREAD_FPSTATE) 4: #endif /* CONFIG_M68KFPU_EMU_ONLY */ /* restore the kernel stack pointer */ movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore non-scratch registers */ RESTORE_SWITCH_STACK /* restore user stack pointer */ movel %a1@(TASK_THREAD+THREAD_USP),%a0 movel %a0,%usp /* restore fs (sfc,%dfc) */ movew %a1@(TASK_THREAD+THREAD_FS),%a0 movec %a0,%sfc movec %a0,%dfc /* restore status register */ movew %a1@(TASK_THREAD+THREAD_SR),%sr rts .data ALIGN SYMBOL_NAME_LABEL(sys_call_table) .long SYMBOL_NAME(sys_ni_syscall) /* 0 - old "setup()" system call*/ .long SYMBOL_NAME(sys_exit) .long SYMBOL_NAME(sys_fork) .long SYMBOL_NAME(sys_read) .long SYMBOL_NAME(sys_write) .long SYMBOL_NAME(sys_open) /* 5 */ .long SYMBOL_NAME(sys_close) .long SYMBOL_NAME(sys_waitpid) .long SYMBOL_NAME(sys_creat) .long SYMBOL_NAME(sys_link) .long SYMBOL_NAME(sys_unlink) /* 10 */ .long SYMBOL_NAME(sys_execve) .long SYMBOL_NAME(sys_chdir) .long SYMBOL_NAME(sys_time) .long SYMBOL_NAME(sys_mknod) .long SYMBOL_NAME(sys_chmod) /* 15 */ .long SYMBOL_NAME(sys_chown) .long SYMBOL_NAME(sys_ni_syscall) /* old break syscall holder */ .long SYMBOL_NAME(sys_stat) .long SYMBOL_NAME(sys_lseek) .long SYMBOL_NAME(sys_getpid) /* 20 */ .long SYMBOL_NAME(sys_mount) .long SYMBOL_NAME(sys_oldumount) .long SYMBOL_NAME(sys_setuid) .long SYMBOL_NAME(sys_getuid) .long SYMBOL_NAME(sys_stime) /* 25 */ .long SYMBOL_NAME(sys_ptrace) .long SYMBOL_NAME(sys_alarm) .long SYMBOL_NAME(sys_fstat) .long SYMBOL_NAME(sys_pause) .long SYMBOL_NAME(sys_utime) /* 30 */ .long SYMBOL_NAME(sys_ni_syscall) /* old stty syscall holder */ .long SYMBOL_NAME(sys_ni_syscall) /* old gtty syscall holder */ .long SYMBOL_NAME(sys_access) .long SYMBOL_NAME(sys_nice) .long SYMBOL_NAME(sys_ni_syscall) /* 35 */ /* old ftime syscall holder */ .long SYMBOL_NAME(sys_sync) .long SYMBOL_NAME(sys_kill) .long SYMBOL_NAME(sys_rename) .long SYMBOL_NAME(sys_mkdir) .long SYMBOL_NAME(sys_rmdir) /* 40 */ .long SYMBOL_NAME(sys_dup) .long SYMBOL_NAME(sys_pipe) .long SYMBOL_NAME(sys_times) .long SYMBOL_NAME(sys_ni_syscall) /* old prof syscall holder */ .long SYMBOL_NAME(sys_brk) /* 45 */ .long SYMBOL_NAME(sys_setgid) .long SYMBOL_NAME(sys_getgid) .long SYMBOL_NAME(sys_signal) .long SYMBOL_NAME(sys_geteuid) .long SYMBOL_NAME(sys_getegid) /* 50 */ .long SYMBOL_NAME(sys_acct) .long SYMBOL_NAME(sys_umount) /* recycled never used phys() */ .long SYMBOL_NAME(sys_ni_syscall) /* old lock syscall holder */ .long SYMBOL_NAME(sys_ioctl) .long SYMBOL_NAME(sys_fcntl) /* 55 */ .long SYMBOL_NAME(sys_ni_syscall) /* old mpx syscall holder */ .long SYMBOL_NAME(sys_setpgid) .long SYMBOL_NAME(sys_ni_syscall) /* old ulimit syscall holder */ .long SYMBOL_NAME(sys_ni_syscall) .long SYMBOL_NAME(sys_umask) /* 60 */ .long SYMBOL_NAME(sys_chroot) .long SYMBOL_NAME(sys_ustat) .long SYMBOL_NAME(sys_dup2) .long SYMBOL_NAME(sys_getppid) .long SYMBOL_NAME(sys_getpgrp) /* 65 */ .long SYMBOL_NAME(sys_setsid) .long SYMBOL_NAME(sys_sigaction) .long SYMBOL_NAME(sys_sgetmask) .long SYMBOL_NAME(sys_ssetmask) .long SYMBOL_NAME(sys_setreuid) /* 70 */ .long SYMBOL_NAME(sys_setregid) .long SYMBOL_NAME(sys_sigsuspend) .long SYMBOL_NAME(sys_sigpending) .long SYMBOL_NAME(sys_sethostname) .long SYMBOL_NAME(sys_setrlimit) /* 75 */ .long SYMBOL_NAME(sys_getrlimit) .long SYMBOL_NAME(sys_getrusage) .long SYMBOL_NAME(sys_gettimeofday) .long SYMBOL_NAME(sys_settimeofday) .long SYMBOL_NAME(sys_getgroups) /* 80 */ .long SYMBOL_NAME(sys_setgroups) .long SYMBOL_NAME(old_select) .long SYMBOL_NAME(sys_symlink) .long SYMBOL_NAME(sys_lstat) .long SYMBOL_NAME(sys_readlink) /* 85 */ .long SYMBOL_NAME(sys_uselib) .long SYMBOL_NAME(sys_swapon) .long SYMBOL_NAME(sys_reboot) .long SYMBOL_NAME(old_readdir) .long SYMBOL_NAME(old_mmap) /* 90 */ .long SYMBOL_NAME(sys_munmap) .long SYMBOL_NAME(sys_truncate) .long SYMBOL_NAME(sys_ftruncate) .long SYMBOL_NAME(sys_fchmod) .long SYMBOL_NAME(sys_fchown) /* 95 */ .long SYMBOL_NAME(sys_getpriority) .long SYMBOL_NAME(sys_setpriority) .long SYMBOL_NAME(sys_ni_syscall) /* old profil syscall holder */ .long SYMBOL_NAME(sys_statfs) .long SYMBOL_NAME(sys_fstatfs) /* 100 */ .long SYMBOL_NAME(sys_ioperm) .long SYMBOL_NAME(sys_socketcall) .long SYMBOL_NAME(sys_syslog) .long SYMBOL_NAME(sys_setitimer) .long SYMBOL_NAME(sys_getitimer) /* 105 */ .long SYMBOL_NAME(sys_newstat) .long SYMBOL_NAME(sys_newlstat) .long SYMBOL_NAME(sys_newfstat) .long SYMBOL_NAME(sys_ni_syscall) .long SYMBOL_NAME(sys_ni_syscall) /* iopl for i386 */ /* 110 */ .long SYMBOL_NAME(sys_vhangup) .long SYMBOL_NAME(sys_ni_syscall) /* obsolete idle() syscall */ .long SYMBOL_NAME(sys_ni_syscall) /* vm86old for i386 */ .long SYMBOL_NAME(sys_wait4) .long SYMBOL_NAME(sys_swapoff) /* 115 */ .long SYMBOL_NAME(sys_sysinfo) .long SYMBOL_NAME(sys_ipc) .long SYMBOL_NAME(sys_fsync) .long SYMBOL_NAME(sys_sigreturn) .long SYMBOL_NAME(sys_clone) /* 120 */ .long SYMBOL_NAME(sys_setdomainname) .long SYMBOL_NAME(sys_newuname) .long SYMBOL_NAME(sys_cacheflush) /* modify_ldt for i386 */ .long SYMBOL_NAME(sys_adjtimex) .long SYMBOL_NAME(sys_mprotect) /* 125 */ .long SYMBOL_NAME(sys_sigprocmask) .long SYMBOL_NAME(sys_create_module) .long SYMBOL_NAME(sys_init_module) .long SYMBOL_NAME(sys_delete_module) .long SYMBOL_NAME(sys_get_kernel_syms) /* 130 */ .long SYMBOL_NAME(sys_quotactl) .long SYMBOL_NAME(sys_getpgid) .long SYMBOL_NAME(sys_fchdir) .long SYMBOL_NAME(sys_bdflush) .long SYMBOL_NAME(sys_sysfs) /* 135 */ .long SYMBOL_NAME(sys_personality) .long SYMBOL_NAME(sys_ni_syscall) /* for afs_syscall */ .long SYMBOL_NAME(sys_setfsuid) .long SYMBOL_NAME(sys_setfsgid) .long SYMBOL_NAME(sys_llseek) /* 140 */ .long SYMBOL_NAME(sys_getdents) .long SYMBOL_NAME(sys_select) .long SYMBOL_NAME(sys_flock) .long SYMBOL_NAME(sys_msync) .long SYMBOL_NAME(sys_readv) /* 145 */ .long SYMBOL_NAME(sys_writev) .long SYMBOL_NAME(sys_getsid) .long SYMBOL_NAME(sys_fdatasync) .long SYMBOL_NAME(sys_sysctl) .long SYMBOL_NAME(sys_mlock) /* 150 */ .long SYMBOL_NAME(sys_munlock) .long SYMBOL_NAME(sys_mlockall) .long SYMBOL_NAME(sys_munlockall) .long SYMBOL_NAME(sys_sched_setparam) .long SYMBOL_NAME(sys_sched_getparam) /* 155 */ .long SYMBOL_NAME(sys_sched_setscheduler) .long SYMBOL_NAME(sys_sched_getscheduler) .long SYMBOL_NAME(sys_sched_yield) .long SYMBOL_NAME(sys_sched_get_priority_max) .long SYMBOL_NAME(sys_sched_get_priority_min) /* 160 */ .long SYMBOL_NAME(sys_sched_rr_get_interval) .long SYMBOL_NAME(sys_nanosleep) .long SYMBOL_NAME(sys_mremap) .long SYMBOL_NAME(sys_setresuid) .long SYMBOL_NAME(sys_getresuid) /* 165 */ .long SYMBOL_NAME(sys_ni_syscall) /* for vm86 */ .long SYMBOL_NAME(sys_query_module) .long SYMBOL_NAME(sys_poll) .long SYMBOL_NAME(sys_nfsservctl) .long SYMBOL_NAME(sys_setresgid) /* 170 */ .long SYMBOL_NAME(sys_getresgid) .long SYMBOL_NAME(sys_prctl) .long SYMBOL_NAME(sys_rt_sigreturn) .long SYMBOL_NAME(sys_rt_sigaction) .long SYMBOL_NAME(sys_rt_sigprocmask) /* 175 */ .long SYMBOL_NAME(sys_rt_sigpending) .long SYMBOL_NAME(sys_rt_sigtimedwait) .long SYMBOL_NAME(sys_rt_sigqueueinfo) .long SYMBOL_NAME(sys_rt_sigsuspend) .long SYMBOL_NAME(sys_pread) /* 180 */ .long SYMBOL_NAME(sys_pwrite) .long SYMBOL_NAME(sys_lchown); .long SYMBOL_NAME(sys_getcwd) .long SYMBOL_NAME(sys_capget) .long SYMBOL_NAME(sys_capset) /* 185 */ .long SYMBOL_NAME(sys_sigaltstack) .long SYMBOL_NAME(sys_sendfile) .long SYMBOL_NAME(sys_ni_syscall) /* streams1 */ .long SYMBOL_NAME(sys_ni_syscall) /* streams2 */ .long SYMBOL_NAME(sys_vfork) /* 190 */ .rept NR_syscalls-(.-SYMBOL_NAME(sys_call_table))/4 .long SYMBOL_NAME(sys_ni_syscall) .endr