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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | /* * linux/arch/m68knommu/platform/68360/entry.S * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2001 SED Systems, a Division of Calian Ltd. * * 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 * M68360 Port by SED Systems, and Lineo. */ #include <linux/config.h> #include <linux/sys.h> #include <linux/linkage.h> #include <asm/thread_info.h> #include <asm/unistd.h> #include <asm/errno.h> #include <asm/setup.h> #include <asm/segment.h> #include <asm/traps.h> #include <asm/asm-offsets.h> #include <asm/entry.h> .text .globl system_call .globl resume .globl ret_from_exception .globl ret_from_signal .globl sys_call_table .globl ret_from_interrupt .globl bad_interrupt .globl inthandler 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 lsl #2,%d1 lea sys_call_table, %a0 jbsr %a0@(%d1) 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 jra ret_from_exception ENTRY(system_call) SAVE_ALL /* save top of frame*/ pea %sp@ jbsr set_esp0 addql #4,%sp btst #PF_TRACESYS_BIT,%a2@(TASK_FLAGS+PF_TRACESYS_OFF) jne do_trace cmpl #NR_syscalls,%d0 jcc badsys lsl #2,%d0 lea sys_call_table,%a0 movel %a0@(%d0), %a0 jbsr %a0@ movel %d0,%sp@(PT_D0) /* save the return value*/ ret_from_exception: btst #5,%sp@(PT_SR) /* check if returning to kernel*/ jeq Luser_return /* if so, skip resched, signals*/ Lkernel_return: RESTORE_ALL Luser_return: /* 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 movel %sp,%d1 /* get thread_info pointer */ andl #0xffffe000,%d1 movel %d1,%a2 move %a2@(TI_FLAGS),%d1 /* thread_info->flags */ andl #_TIF_WORK_MASK,%d1 jne Lwork_to_do RESTORE_ALL Lwork_to_do: movel %a2@(TI_FLAGS),%d1 /* thread_info->flags */ btst #TIF_NEED_RESCHED,%d1 jne reschedule Lsignal_return: subql #4,%sp /* dummy return address*/ SAVE_SWITCH_STACK pea %sp@(SWITCH_STACK_SIZE) clrl %sp@- bsrw do_signal addql #8,%sp RESTORE_SWITCH_STACK addql #4,%sp Lreturn: RESTORE_ALL /* * This is the main interrupt handler, responsible for calling process_int() */ inthandler: SAVE_ALL addql #1,local_irq_count /* put exception # in d0*/ movew %sp@(PT_VECTOR), %d0 and.l #0x3ff, %d0 lsr.l #0x02, %d0 movel %sp,%sp@- movel %d0,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_interrupt ret_from_interrupt: subql #1,local_irq_count jeq 1f 2: RESTORE_ALL 1: moveb %sp@(PT_SR), %d0 and #7, %d0 jhi 2b /* check if we need to do software interrupts */ movel irq_stat+CPUSTAT_SOFTIRQ_PENDING,%d0 jeq ret_from_exception pea ret_from_exception jra do_softirq /* * Handler for uninitialized and spurious interrupts. */ bad_interrupt: addql #1,num_spurious rte /* * 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. */ ENTRY(resume) movel %a0,%d1 /* save prev thread in d1 */ movew %sr,%a0@(TASK_THREAD+THREAD_SR) /* save sr */ movel %usp,%a2 /* save usp */ movel %a2,%a0@(TASK_THREAD+THREAD_USP) SAVE_SWITCH_STACK movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ RESTORE_SWITCH_STACK movel %a1@(TASK_THREAD+THREAD_USP),%a0 /* restore user stack */ movel %a0,%usp movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ rts |