From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/m68k/kernel/entry.S | 712 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 712 insertions(+) create mode 100644 arch/m68k/kernel/entry.S (limited to 'arch/m68k/kernel/entry.S') diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S new file mode 100644 index 00000000000..e964015a31d --- /dev/null +++ b/arch/m68k/kernel/entry.S @@ -0,0 +1,712 @@ +/* -*- 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. + * + * 6/05/00 RZ: addedd writeback completion after return from sighandler + * for 68040 + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +.globl system_call, buserr, trap +.globl resume, ret_from_exception +.globl ret_from_signal +.globl inthandler, sys_call_table +.globl sys_fork, sys_clone, sys_vfork +.globl ret_from_interrupt, bad_interrupt + +.text +ENTRY(buserr) + SAVE_ALL_INT + GET_CURRENT(%d0) + movel %sp,%sp@- | stack frame pointer argument + bsrl buserr_c + addql #4,%sp + jra ret_from_exception + +ENTRY(trap) + SAVE_ALL_INT + GET_CURRENT(%d0) + movel %sp,%sp@- | stack frame pointer argument + bsrl trap_c + addql #4,%sp + jra ret_from_exception + + | After a fork we jump here directly from resume, + | so that %d1 contains the previous task + | schedule_tail now used regardless of CONFIG_SMP +ENTRY(ret_from_fork) + movel %d1,%sp@- + jsr schedule_tail + addql #4,%sp + jra ret_from_exception + +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 + jbsr @(sys_call_table,%d1:l:4)@(0) +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 +/* on 68040 complete pending writebacks if any */ +#ifdef CONFIG_M68040 + bfextu %sp@(PT_VECTOR){#0,#4},%d0 + subql #7,%d0 | bus error frame ? + jbne 1f + movel %sp,%sp@- + jbsr berr_040cleanup + addql #4,%sp +1: +#endif + jra ret_from_exception + +ENTRY(system_call) + SAVE_ALL_SYS + + GET_CURRENT(%d1) + | save top of frame + movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0) + + tstb %curptr@(TASK_SYSCALL_TRACE) + jne do_trace + cmpl #NR_syscalls,%d0 + jcc badsys + jbsr @(sys_call_table,%d0:l:4)@(0) + movel %d0,%sp@(PT_D0) | save the return value + + |oriw #0x0700,%sr + movel %curptr@(TASK_WORK),%d0 + jne syscall_exit_work +1: RESTORE_ALL + +syscall_exit_work: + btst #5,%sp@(PT_SR) | check if returning to kernel + bnes 1b | if so, skip resched, signals + tstw %d0 + jeq do_signal_return + tstb %d0 + jne do_delayed_trace + + pea resume_userspace + jmp schedule + +ret_from_exception: + btst #5,%sp@(PT_SR) | check if returning to kernel + bnes 1f | 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 interrupt load + andw #ALLOWINT,%sr + +resume_userspace: + movel %curptr@(TASK_WORK),%d0 + lsrl #8,%d0 + jne exit_work +1: RESTORE_ALL + +exit_work: + | save top of frame + movel %sp,%curptr@(TASK_THREAD+THREAD_ESP0) + tstb %d0 + jeq do_signal_return + + pea resume_userspace + jmp schedule + +do_signal_return: + |andw #ALLOWINT,%sr + subql #4,%sp | dummy return address + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + clrl %sp@- + bsrl do_signal + addql #8,%sp + RESTORE_SWITCH_STACK + addql #4,%sp + jbra resume_userspace + +do_delayed_trace: + bclr #7,%sp@(PT_SR) | clear trace bit in SR + pea 1 | send SIGTRAP + movel %curptr,%sp@- + pea LSIGTRAP + jbsr send_sig + addql #8,%sp + addql #4,%sp + jbra resume_userspace + + +#if 0 +#ifdef CONFIG_AMIGA +ami_inthandler: + addql #1,irq_stat+CPUSTAT_LOCAL_IRQ_COUNT + SAVE_ALL_INT + GET_CURRENT(%d0) + + bfextu %sp@(PT_VECTOR){#4,#12},%d0 + movel %d0,%a0 + addql #1,%a0@(kstat+STAT_IRQ-VECOFF(VEC_SPUR)) + movel %a0@(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@(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() +*/ +inthandler: + SAVE_ALL_INT + GET_CURRENT(%d0) + addqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2) + | 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 floppy_hardint + jbra 3f +1: +#endif + jbsr process_int | process the IRQ +3: addql #8,%sp | pop parameters off stack + +ret_from_interrupt: + subqb #1,%curptr@(TASK_INFO+TINFO_PREEMPT+2) + jeq 1f +2: + RESTORE_ALL +1: + moveq #(~ALLOWINT>>8)&0xff,%d0 + andb %sp@(PT_SR),%d0 + jne 2b + + /* check if we need to do software interrupts */ + tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING + jeq ret_from_exception + pea ret_from_exception + jra do_softirq + + +/* Handler for uninitialized and spurious interrupts */ + +bad_interrupt: + addql #1,num_spurious + rte + +ENTRY(sys_fork) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr m68k_fork + addql #4,%sp + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_clone) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr m68k_clone + addql #4,%sp + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_vfork) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr m68k_vfork + addql #4,%sp + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_sigsuspend) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr do_sigsuspend + addql #4,%sp + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_rt_sigsuspend) + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jbsr do_rt_sigsuspend + addql #4,%sp + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_sigreturn) + SAVE_SWITCH_STACK + jbsr do_sigreturn + RESTORE_SWITCH_STACK + rts + +ENTRY(sys_rt_sigreturn) + SAVE_SWITCH_STACK + jbsr do_rt_sigreturn + RESTORE_SWITCH_STACK + rts + +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 m68k_fputype + jeq 3f +#endif + fsave %a0@(TASK_THREAD+THREAD_FPSTATE) + +#if defined(CONFIG_M68060) +#if !defined(CPU_M68060_ONLY) + btst #3,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 m68k_fputype + jeq 4f +#endif +#if defined(CONFIG_M68060) +#if !defined(CPU_M68060_ONLY) + btst #3,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 +sys_call_table: + .long sys_ni_syscall /* 0 - old "setup()" system call*/ + .long sys_exit + .long sys_fork + .long sys_read + .long sys_write + .long sys_open /* 5 */ + .long sys_close + .long sys_waitpid + .long sys_creat + .long sys_link + .long sys_unlink /* 10 */ + .long sys_execve + .long sys_chdir + .long sys_time + .long sys_mknod + .long sys_chmod /* 15 */ + .long sys_chown16 + .long sys_ni_syscall /* old break syscall holder */ + .long sys_stat + .long sys_lseek + .long sys_getpid /* 20 */ + .long sys_mount + .long sys_oldumount + .long sys_setuid16 + .long sys_getuid16 + .long sys_stime /* 25 */ + .long sys_ptrace + .long sys_alarm + .long sys_fstat + .long sys_pause + .long sys_utime /* 30 */ + .long sys_ni_syscall /* old stty syscall holder */ + .long sys_ni_syscall /* old gtty syscall holder */ + .long sys_access + .long sys_nice + .long sys_ni_syscall /* 35 */ /* old ftime syscall holder */ + .long sys_sync + .long sys_kill + .long sys_rename + .long sys_mkdir + .long sys_rmdir /* 40 */ + .long sys_dup + .long sys_pipe + .long sys_times + .long sys_ni_syscall /* old prof syscall holder */ + .long sys_brk /* 45 */ + .long sys_setgid16 + .long sys_getgid16 + .long sys_signal + .long sys_geteuid16 + .long sys_getegid16 /* 50 */ + .long sys_acct + .long sys_umount /* recycled never used phys() */ + .long sys_ni_syscall /* old lock syscall holder */ + .long sys_ioctl + .long sys_fcntl /* 55 */ + .long sys_ni_syscall /* old mpx syscall holder */ + .long sys_setpgid + .long sys_ni_syscall /* old ulimit syscall holder */ + .long sys_ni_syscall + .long sys_umask /* 60 */ + .long sys_chroot + .long sys_ustat + .long sys_dup2 + .long sys_getppid + .long sys_getpgrp /* 65 */ + .long sys_setsid + .long sys_sigaction + .long sys_sgetmask + .long sys_ssetmask + .long sys_setreuid16 /* 70 */ + .long sys_setregid16 + .long sys_sigsuspend + .long sys_sigpending + .long sys_sethostname + .long sys_setrlimit /* 75 */ + .long sys_old_getrlimit + .long sys_getrusage + .long sys_gettimeofday + .long sys_settimeofday + .long sys_getgroups16 /* 80 */ + .long sys_setgroups16 + .long old_select + .long sys_symlink + .long sys_lstat + .long sys_readlink /* 85 */ + .long sys_uselib + .long sys_swapon + .long sys_reboot + .long old_readdir + .long old_mmap /* 90 */ + .long sys_munmap + .long sys_truncate + .long sys_ftruncate + .long sys_fchmod + .long sys_fchown16 /* 95 */ + .long sys_getpriority + .long sys_setpriority + .long sys_ni_syscall /* old profil syscall holder */ + .long sys_statfs + .long sys_fstatfs /* 100 */ + .long sys_ni_syscall /* ioperm for i386 */ + .long sys_socketcall + .long sys_syslog + .long sys_setitimer + .long sys_getitimer /* 105 */ + .long sys_newstat + .long sys_newlstat + .long sys_newfstat + .long sys_ni_syscall + .long sys_ni_syscall /* 110 */ /* iopl for i386 */ + .long sys_vhangup + .long sys_ni_syscall /* obsolete idle() syscall */ + .long sys_ni_syscall /* vm86old for i386 */ + .long sys_wait4 + .long sys_swapoff /* 115 */ + .long sys_sysinfo + .long sys_ipc + .long sys_fsync + .long sys_sigreturn + .long sys_clone /* 120 */ + .long sys_setdomainname + .long sys_newuname + .long sys_cacheflush /* modify_ldt for i386 */ + .long sys_adjtimex + .long sys_mprotect /* 125 */ + .long sys_sigprocmask + .long sys_ni_syscall /* old "create_module" */ + .long sys_init_module + .long sys_delete_module + .long sys_ni_syscall /* 130 - old "get_kernel_syms" */ + .long sys_quotactl + .long sys_getpgid + .long sys_fchdir + .long sys_bdflush + .long sys_sysfs /* 135 */ + .long sys_personality + .long sys_ni_syscall /* for afs_syscall */ + .long sys_setfsuid16 + .long sys_setfsgid16 + .long sys_llseek /* 140 */ + .long sys_getdents + .long sys_select + .long sys_flock + .long sys_msync + .long sys_readv /* 145 */ + .long sys_writev + .long sys_getsid + .long sys_fdatasync + .long sys_sysctl + .long sys_mlock /* 150 */ + .long sys_munlock + .long sys_mlockall + .long sys_munlockall + .long sys_sched_setparam + .long sys_sched_getparam /* 155 */ + .long sys_sched_setscheduler + .long sys_sched_getscheduler + .long sys_sched_yield + .long sys_sched_get_priority_max + .long sys_sched_get_priority_min /* 160 */ + .long sys_sched_rr_get_interval + .long sys_nanosleep + .long sys_mremap + .long sys_setresuid16 + .long sys_getresuid16 /* 165 */ + .long sys_getpagesize + .long sys_ni_syscall /* old sys_query_module */ + .long sys_poll + .long sys_nfsservctl + .long sys_setresgid16 /* 170 */ + .long sys_getresgid16 + .long sys_prctl + .long sys_rt_sigreturn + .long sys_rt_sigaction + .long sys_rt_sigprocmask /* 175 */ + .long sys_rt_sigpending + .long sys_rt_sigtimedwait + .long sys_rt_sigqueueinfo + .long sys_rt_sigsuspend + .long sys_pread64 /* 180 */ + .long sys_pwrite64 + .long sys_lchown16; + .long sys_getcwd + .long sys_capget + .long sys_capset /* 185 */ + .long sys_sigaltstack + .long sys_sendfile + .long sys_ni_syscall /* streams1 */ + .long sys_ni_syscall /* streams2 */ + .long sys_vfork /* 190 */ + .long sys_getrlimit + .long sys_mmap2 + .long sys_truncate64 + .long sys_ftruncate64 + .long sys_stat64 /* 195 */ + .long sys_lstat64 + .long sys_fstat64 + .long sys_chown + .long sys_getuid + .long sys_getgid /* 200 */ + .long sys_geteuid + .long sys_getegid + .long sys_setreuid + .long sys_setregid + .long sys_getgroups /* 205 */ + .long sys_setgroups + .long sys_fchown + .long sys_setresuid + .long sys_getresuid + .long sys_setresgid /* 210 */ + .long sys_getresgid + .long sys_lchown + .long sys_setuid + .long sys_setgid + .long sys_setfsuid /* 215 */ + .long sys_setfsgid + .long sys_pivot_root + .long sys_ni_syscall + .long sys_ni_syscall + .long sys_getdents64 /* 220 */ + .long sys_gettid + .long sys_tkill + .long sys_setxattr + .long sys_lsetxattr + .long sys_fsetxattr /* 225 */ + .long sys_getxattr + .long sys_lgetxattr + .long sys_fgetxattr + .long sys_listxattr + .long sys_llistxattr /* 230 */ + .long sys_flistxattr + .long sys_removexattr + .long sys_lremovexattr + .long sys_fremovexattr + .long sys_futex /* 235 */ + .long sys_sendfile64 + .long sys_mincore + .long sys_madvise + .long sys_fcntl64 + .long sys_readahead /* 240 */ + .long sys_io_setup + .long sys_io_destroy + .long sys_io_getevents + .long sys_io_submit + .long sys_io_cancel /* 245 */ + .long sys_fadvise64 + .long sys_exit_group + .long sys_lookup_dcookie + .long sys_epoll_create + .long sys_epoll_ctl /* 250 */ + .long sys_epoll_wait + .long sys_remap_file_pages + .long sys_set_tid_address + .long sys_timer_create + .long sys_timer_settime /* 255 */ + .long sys_timer_gettime + .long sys_timer_getoverrun + .long sys_timer_delete + .long sys_clock_settime + .long sys_clock_gettime /* 260 */ + .long sys_clock_getres + .long sys_clock_nanosleep + .long sys_statfs64 + .long sys_fstatfs64 + .long sys_tgkill /* 265 */ + .long sys_utimes + .long sys_fadvise64_64 + .long sys_mbind + .long sys_get_mempolicy + .long sys_set_mempolicy /* 270 */ + .long sys_mq_open + .long sys_mq_unlink + .long sys_mq_timedsend + .long sys_mq_timedreceive + .long sys_mq_notify /* 275 */ + .long sys_mq_getsetattr + .long sys_waitid + .long sys_ni_syscall /* for sys_vserver */ + .long sys_add_key + .long sys_request_key /* 280 */ + .long sys_keyctl + -- cgit v1.2.3