Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* -*- mode: asm -*- |
| 2 | * |
| 3 | * linux/arch/h8300/platform/h8300h/entry.S |
| 4 | * |
| 5 | * Yoshinori Sato <ysato@users.sourceforge.jp> |
| 6 | * David McCullough <davidm@snapgear.com> |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * entry.S |
| 12 | * include exception/interrupt gateway |
| 13 | * system call entry |
| 14 | */ |
| 15 | |
| 16 | #include <linux/sys.h> |
| 17 | #include <linux/config.h> |
| 18 | #include <asm/unistd.h> |
| 19 | #include <asm/setup.h> |
| 20 | #include <asm/segment.h> |
| 21 | #include <asm/linkage.h> |
| 22 | #include <asm/asm-offsets.h> |
| 23 | #include <asm/thread_info.h> |
| 24 | #include <asm/errno.h> |
| 25 | |
| 26 | .h8300h |
| 27 | |
| 28 | /* CPU context save/restore macros. */ |
| 29 | |
| 30 | .macro SAVE_ALL |
| 31 | mov.l er0,@-sp |
| 32 | |
| 33 | stc ccr,r0l /* check kernel mode */ |
| 34 | orc #0x10,ccr |
| 35 | btst #4,r0l |
| 36 | bne 5f |
| 37 | |
| 38 | mov.l sp,@SYMBOL_NAME(sw_usp) /* user mode */ |
| 39 | mov.l @sp,er0 |
| 40 | mov.l @SYMBOL_NAME(sw_ksp),sp |
| 41 | sub.l #(LRET-LORIG),sp /* allocate LORIG - LRET */ |
| 42 | mov.l er0,@-sp |
| 43 | mov.l er1,@-sp |
| 44 | mov.l @SYMBOL_NAME(sw_usp),er0 |
| 45 | mov.l @(8:16,er0),er1 /* copy the RET addr */ |
| 46 | mov.l er1,@(LRET-LER1:16,sp) |
| 47 | |
| 48 | mov.w e1,r1 /* e1 highbyte = ccr */ |
| 49 | and #0xef,r1h /* mask mode? flag */ |
| 50 | sub.w r0,r0 |
| 51 | mov.b r1h,r0l |
| 52 | mov.w r0,@(LCCR-LER1:16,sp) /* copy ccr */ |
| 53 | mov.l @(LORIG-LER1:16,sp),er0 |
| 54 | mov.l er0,@(LER0-LER1:16,sp) /* copy ER0 */ |
| 55 | bra 6f |
| 56 | 5: |
| 57 | mov.l @sp,er0 /* kernel mode */ |
| 58 | subs #2,sp /* dummy ccr */ |
| 59 | mov.l er0,@-sp |
| 60 | mov.l er1,@-sp |
| 61 | mov.w @(LRET-LER1:16,sp),r1 /* copy old ccr */ |
| 62 | mov.b r1h,r1l |
| 63 | mov.b #0,r1h |
| 64 | mov.w r1,@(LCCR-LER1:16,sp) /* set ccr */ |
| 65 | 6: |
| 66 | mov.l er2,@-sp |
| 67 | mov.l er3,@-sp |
| 68 | mov.l er6,@-sp /* syscall arg #6 */ |
| 69 | mov.l er5,@-sp /* syscall arg #5 */ |
| 70 | mov.l er4,@-sp /* syscall arg #4 */ |
| 71 | .endm |
| 72 | |
| 73 | .macro RESTORE_ALL |
| 74 | mov.l @sp+,er4 |
| 75 | mov.l @sp+,er5 |
| 76 | mov.l @sp+,er6 |
| 77 | mov.l @sp+,er3 |
| 78 | mov.l @sp+,er2 |
| 79 | mov.w @(LCCR-LER1:16,sp),r0 /* check kernel mode */ |
| 80 | btst #4,r0l |
| 81 | bne 7f |
| 82 | |
| 83 | orc #0x80,ccr |
| 84 | mov.l @SYMBOL_NAME(sw_usp),er0 |
| 85 | mov.l @(LER0-LER1:16,sp),er1 /* restore ER0 */ |
| 86 | mov.l er1,@er0 |
| 87 | mov.w @(LCCR-LER1:16,sp),r1 /* restore the RET addr */ |
| 88 | mov.b r1l,r1h |
| 89 | mov.b @(LRET+1-LER1:16,sp),r1l |
| 90 | mov.w r1,e1 |
| 91 | mov.w @(LRET+2-LER1:16,sp),r1 |
| 92 | mov.l er1,@(8:16,er0) |
| 93 | |
| 94 | mov.l @sp+,er1 |
| 95 | add.l #(LRET-LER1),sp /* remove LORIG - LRET */ |
| 96 | mov.l sp,@SYMBOL_NAME(sw_ksp) |
| 97 | mov.l er0,sp |
| 98 | bra 8f |
| 99 | 7: |
| 100 | mov.l @sp+,er1 |
| 101 | adds #4,sp |
| 102 | adds #2,sp |
| 103 | 8: |
| 104 | mov.l @sp+,er0 |
| 105 | adds #4,sp /* remove the sw created LVEC */ |
| 106 | rte |
| 107 | .endm |
| 108 | |
| 109 | .globl SYMBOL_NAME(system_call) |
| 110 | .globl SYMBOL_NAME(ret_from_exception) |
| 111 | .globl SYMBOL_NAME(ret_from_fork) |
| 112 | .globl SYMBOL_NAME(ret_from_interrupt) |
| 113 | .globl SYMBOL_NAME(interrupt_redirect_table) |
| 114 | .globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp) |
| 115 | .globl SYMBOL_NAME(resume) |
| 116 | .globl SYMBOL_NAME(interrupt_redirect_table) |
| 117 | .globl SYMBOL_NAME(interrupt_entry) |
| 118 | .globl SYMBOL_NAME(system_call) |
| 119 | .globl SYMBOL_NAME(trace_break) |
| 120 | |
| 121 | #if defined(CONFIG_ROMKERNEL) |
| 122 | INTERRUPTS = 64 |
| 123 | .section .int_redirect,"ax" |
| 124 | SYMBOL_NAME_LABEL(interrupt_redirect_table) |
| 125 | .rept 7 |
| 126 | .long 0 |
| 127 | .endr |
| 128 | jsr @SYMBOL_NAME(interrupt_entry) /* NMI */ |
| 129 | jmp @SYMBOL_NAME(system_call) /* TRAPA #0 (System call) */ |
| 130 | .long 0 |
| 131 | .long 0 |
| 132 | jmp @SYMBOL_NAME(trace_break) /* TRAPA #3 (breakpoint) */ |
| 133 | .rept INTERRUPTS-12 |
| 134 | jsr @SYMBOL_NAME(interrupt_entry) |
| 135 | .endr |
| 136 | #endif |
| 137 | #if defined(CONFIG_RAMKERNEL) |
| 138 | .globl SYMBOL_NAME(interrupt_redirect_table) |
| 139 | .section .bss |
| 140 | SYMBOL_NAME_LABEL(interrupt_redirect_table) |
| 141 | .space 4 |
| 142 | #endif |
| 143 | |
| 144 | .section .text |
| 145 | .align 2 |
| 146 | SYMBOL_NAME_LABEL(interrupt_entry) |
| 147 | SAVE_ALL |
| 148 | mov.w @(LCCR,sp),r0 |
| 149 | btst #4,r0l |
| 150 | bne 1f |
| 151 | mov.l @SYMBOL_NAME(sw_usp),er0 |
| 152 | mov.l @(4:16,er0),er0 |
| 153 | bra 2f |
| 154 | 1: |
| 155 | mov.l @(LVEC,sp),er0 |
| 156 | 2: |
| 157 | #if defined(CONFIG_ROMKERNEL) |
| 158 | sub.l #SYMBOL_NAME(interrupt_redirect_table),er0 |
| 159 | #endif |
| 160 | #if defined(CONFIG_RAMKERNEL) |
| 161 | mov.l @SYMBOL_NAME(interrupt_redirect_table),er1 |
| 162 | sub.l er1,er0 |
| 163 | #endif |
| 164 | shlr.l er0 |
| 165 | shlr.l er0 |
| 166 | dec.l #1,er0 |
| 167 | mov.l sp,er1 |
| 168 | subs #4,er1 /* adjust ret_pc */ |
| 169 | jsr @SYMBOL_NAME(process_int) |
| 170 | mov.l @SYMBOL_NAME(irq_stat)+CPUSTAT_SOFTIRQ_PENDING,er0 |
| 171 | beq 1f |
| 172 | jsr @SYMBOL_NAME(do_softirq) |
| 173 | 1: |
| 174 | jmp @SYMBOL_NAME(ret_from_interrupt) |
| 175 | |
| 176 | SYMBOL_NAME_LABEL(system_call) |
| 177 | subs #4,sp /* dummy LVEC */ |
| 178 | SAVE_ALL |
| 179 | mov.w @(LCCR:16,sp),r1 |
| 180 | bset #4,r1l |
| 181 | ldc r1l,ccr |
| 182 | mov.l er0,er4 |
| 183 | mov.l #-ENOSYS,er0 |
| 184 | mov.l er0,@(LER0:16,sp) |
| 185 | |
| 186 | /* save top of frame */ |
| 187 | mov.l sp,er0 |
| 188 | jsr @SYMBOL_NAME(set_esp0) |
| 189 | cmp.l #NR_syscalls,er4 |
| 190 | bcc SYMBOL_NAME(ret_from_exception):16 |
| 191 | shll.l er4 |
| 192 | shll.l er4 |
| 193 | mov.l #SYMBOL_NAME(sys_call_table),er0 |
| 194 | add.l er4,er0 |
| 195 | mov.l @er0,er4 |
| 196 | beq SYMBOL_NAME(ret_from_exception):16 |
| 197 | mov.l sp,er2 |
| 198 | and.w #0xe000,r2 |
| 199 | mov.b @((TASK_FLAGS+3-(TIF_SYSCALL_TRACE >> 3)):16,er2),r2l |
| 200 | btst #(TIF_SYSCALL_TRACE & 7),r2l |
| 201 | bne 1f |
| 202 | mov.l @(LER1:16,sp),er0 |
| 203 | mov.l @(LER2:16,sp),er1 |
| 204 | mov.l @(LER3:16,sp),er2 |
| 205 | jsr @er4 |
| 206 | mov.l er0,@(LER0:16,sp) /* save the return value */ |
| 207 | #if defined(CONFIG_SYSCALL_PRINT) |
| 208 | jsr @SYMBOL_NAME(syscall_print) |
| 209 | #endif |
| 210 | bra SYMBOL_NAME(ret_from_exception):8 |
| 211 | 1: |
| 212 | jsr SYMBOL_NAME(syscall_trace) |
| 213 | mov.l @(LER1:16,sp),er0 |
| 214 | mov.l @(LER2:16,sp),er1 |
| 215 | mov.l @(LER3:16,sp),er2 |
| 216 | jsr @er4 |
| 217 | mov.l er0,@(LER0:16,sp) /* save the return value */ |
| 218 | jsr @SYMBOL_NAME(syscall_trace) |
| 219 | bra SYMBOL_NAME(ret_from_exception):8 |
| 220 | |
| 221 | SYMBOL_NAME_LABEL(ret_from_fork) |
| 222 | mov.l er2,er0 |
| 223 | jsr @SYMBOL_NAME(schedule_tail) |
| 224 | bra SYMBOL_NAME(ret_from_exception):8 |
| 225 | |
| 226 | SYMBOL_NAME_LABEL(reschedule) |
| 227 | /* save top of frame */ |
| 228 | mov.l sp,er0 |
| 229 | jsr @SYMBOL_NAME(set_esp0) |
| 230 | jsr @SYMBOL_NAME(schedule) |
| 231 | |
| 232 | SYMBOL_NAME_LABEL(ret_from_exception) |
| 233 | #if defined(CONFIG_PREEMPT) |
| 234 | orc #0x80,ccr |
| 235 | #endif |
| 236 | SYMBOL_NAME_LABEL(ret_from_interrupt) |
| 237 | mov.b @(LCCR+1:16,sp),r0l |
| 238 | btst #4,r0l /* check if returning to kernel */ |
| 239 | bne done:8 /* if so, skip resched, signals */ |
| 240 | andc #0x7f,ccr |
| 241 | mov.l sp,er4 |
| 242 | and.w #0xe000,r4 |
| 243 | mov.l @(TI_FLAGS:16,er4),er1 |
| 244 | and.l #_TIF_WORK_MASK,er1 |
| 245 | beq done:8 |
| 246 | 1: |
| 247 | mov.l @(TI_FLAGS:16,er4),er1 |
| 248 | btst #TIF_NEED_RESCHED,r1l |
| 249 | bne SYMBOL_NAME(reschedule):16 |
| 250 | mov.l sp,er0 |
| 251 | subs #4,er0 /* adjust retpc */ |
| 252 | mov.l er2,er1 |
| 253 | jsr @SYMBOL_NAME(do_signal) |
| 254 | #if defined(CONFIG_PREEMPT) |
| 255 | bra done:8 /* userspace thoru */ |
| 256 | 3: |
| 257 | btst #4,r0l |
| 258 | beq done:8 /* userspace thoru */ |
| 259 | 4: |
| 260 | mov.l @(TI_PRE_COUNT:16,er4),er1 |
| 261 | bne done:8 |
| 262 | mov.l @(TI_FLAGS:16,er4),er1 |
| 263 | btst #TIF_NEED_RESCHED,r1l |
| 264 | beq done:8 |
| 265 | mov.b r0l,r0l |
| 266 | bpl done:8 /* interrupt off (exception path?) */ |
| 267 | mov.l #PREEMPT_ACTIVE,er1 |
| 268 | mov.l er1,@(TI_PRE_COUNT:16,er4) |
| 269 | andc #0x7f,ccr |
| 270 | jsr @SYMBOL_NAME(schedule) |
| 271 | sub.l er1,er1 |
| 272 | mov.l er1,@(TI_PRE_COUNT:16,er4) |
| 273 | orc #0x80,ccr |
| 274 | bra 4b:8 |
| 275 | #endif |
| 276 | done: |
| 277 | RESTORE_ALL /* Does RTE */ |
| 278 | |
| 279 | SYMBOL_NAME_LABEL(resume) |
| 280 | /* |
| 281 | * Beware - when entering resume, offset of tss is in d1, |
| 282 | * prev (the current task) is in a0, next (the new task) |
| 283 | * is in a1 and d2.b is non-zero if the mm structure is |
| 284 | * shared between the tasks, so don't change these |
| 285 | * registers until their contents are no longer needed. |
| 286 | */ |
| 287 | |
| 288 | /* save sr */ |
| 289 | sub.w r3,r3 |
| 290 | stc ccr,r3l |
| 291 | mov.w r3,@(THREAD_CCR+2:16,er0) |
| 292 | |
| 293 | /* disable interrupts */ |
| 294 | orc #0x80,ccr |
| 295 | mov.l @SYMBOL_NAME(sw_usp),er3 |
| 296 | mov.l er3,@(THREAD_USP:16,er0) |
| 297 | mov.l sp,@(THREAD_KSP:16,er0) |
| 298 | |
| 299 | /* Skip address space switching if they are the same. */ |
| 300 | /* FIXME: what did we hack out of here, this does nothing! */ |
| 301 | |
| 302 | mov.l @(THREAD_USP:16,er1),er0 |
| 303 | mov.l er0,@SYMBOL_NAME(sw_usp) |
| 304 | mov.l @(THREAD_KSP:16,er1),sp |
| 305 | |
| 306 | /* restore status register */ |
| 307 | mov.w @(THREAD_CCR+2:16,er1),r3 |
| 308 | |
| 309 | ldc r3l,ccr |
| 310 | rts |
| 311 | |
| 312 | SYMBOL_NAME_LABEL(trace_break) |
| 313 | subs #4,sp |
| 314 | SAVE_ALL |
| 315 | sub.l er1,er1 |
| 316 | dec.l #1,er1 |
| 317 | mov.l er1,@(LORIG,sp) |
| 318 | mov.l sp,er0 |
| 319 | jsr @SYMBOL_NAME(set_esp0) |
| 320 | mov.l @SYMBOL_NAME(sw_usp),er0 |
| 321 | mov.l @er0,er1 |
| 322 | subs #2,er1 |
| 323 | mov.l er1,@er0 |
| 324 | and.w #0xff,e1 |
| 325 | mov.l er1,er0 |
| 326 | jsr @SYMBOL_NAME(trace_trap) |
| 327 | jmp @SYMBOL_NAME(ret_from_exception) |
| 328 | |
| 329 | .section .bss |
| 330 | SYMBOL_NAME_LABEL(sw_ksp) |
| 331 | .space 4 |
| 332 | SYMBOL_NAME_LABEL(sw_usp) |
| 333 | .space 4 |