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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 | /* * entry.S -- non-mmu 68000 interrupt and exception entry points * * 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 */ #include <linux/linkage.h> #include <asm/thread_info.h> #include <asm/unistd.h> #include <asm/errno.h> #include <asm/setup.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 sys_call_table .globl bad_interrupt .globl inthandler1 .globl inthandler2 .globl inthandler3 .globl inthandler4 .globl inthandler5 .globl inthandler6 .globl inthandler7 badsys: movel #-ENOSYS,%sp@(PT_OFF_D0) jra ret_from_exception do_trace: movel #-ENOSYS,%sp@(PT_OFF_D0) /* needed for strace*/ subql #4,%sp SAVE_SWITCH_STACK jbsr syscall_trace_enter RESTORE_SWITCH_STACK addql #4,%sp addql #1,%d0 jeq ret_from_exception movel %sp@(PT_OFF_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_OFF_D0) /* save the return value */ subql #4,%sp /* dummy return address */ SAVE_SWITCH_STACK jbsr syscall_trace_leave RESTORE_SWITCH_STACK addql #4,%sp jra ret_from_exception ENTRY(system_call) SAVE_ALL_SYS /* save top of frame*/ pea %sp@ jbsr set_esp0 addql #4,%sp movel %sp@(PT_OFF_ORIG_D0),%d0 movel %sp,%d1 /* get thread_info pointer */ andl #-THREAD_SIZE,%d1 movel %d1,%a2 btst #(TIF_SYSCALL_TRACE%8),%a2@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8) 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_OFF_D0) /* save the return value*/ ret_from_exception: btst #5,%sp@(PT_OFF_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 #-THREAD_SIZE,%d1 movel %d1,%a2 1: move %a2@(TINFO_FLAGS),%d1 /* thread_info->flags */ jne Lwork_to_do RESTORE_ALL Lwork_to_do: movel %a2@(TINFO_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) bsrw do_notify_resume addql #4,%sp RESTORE_SWITCH_STACK addql #4,%sp jra 1b /* * This is the main interrupt handler, responsible for calling process_int() */ inthandler1: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #65,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler2: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #66,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler3: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #67,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler4: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #68,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler5: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #69,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler6: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #70,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler7: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %d0 movel %sp,%sp@- movel #71,%sp@- /* put vector # on stack*/ jbsr process_int /* process the IRQ*/ 3: addql #8,%sp /* pop parameters off stack*/ bra ret_from_exception inthandler: SAVE_ALL_INT movew %sp@(PT_OFF_FORMATVEC), %d0 and #0x3ff, %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_exception /* * Handler for uninitialized and spurious interrupts. */ ENTRY(bad_interrupt) addql #1,irq_err_count 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 */ SAVE_SWITCH_STACK movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack */ movel %usp,%a3 /* save usp */ movel %a3,%a0@(TASK_THREAD+THREAD_USP) movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore user stack */ movel %a3,%usp movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new thread stack */ RESTORE_SWITCH_STACK movew %a1@(TASK_THREAD+THREAD_SR),%sr /* restore thread status reg */ rts |