projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * arch/alpha/kernel/entry.S | |
| 3 | * | |
| 4 | * Kernel entry-points. | |
| 5 | */ | |
| 6 | ||
| e2d5df93 | 7 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
8 | #include <asm/thread_info.h> |
| 9 | #include <asm/pal.h> | |
| 10 | #include <asm/errno.h> | |
| 11 | #include <asm/unistd.h> | |
| 12 | ||
| 13 | .text | |
| 14 | .set noat | |
| 15 | ||
| 16 | /* Stack offsets. */ | |
| 17 | #define SP_OFF 184 | |
| 18 | #define SWITCH_STACK_SIZE 320 | |
| 19 | ||
| 20 | /* | |
| 21 | * This defines the normal kernel pt-regs layout. | |
| 22 | * | |
| 23 | * regs 9-15 preserved by C code | |
| 24 | * regs 16-18 saved by PAL-code | |
| 25 | * regs 29-30 saved and set up by PAL-code | |
| 26 | * JRP - Save regs 16-18 in a special area of the stack, so that | |
| 27 | * the palcode-provided values are available to the signal handler. | |
| 28 | */ | |
| 29 | ||
| 30 | #define SAVE_ALL \ | |
| 31 | subq $sp, SP_OFF, $sp; \ | |
| 32 | stq $0, 0($sp); \ | |
| 33 | stq $1, 8($sp); \ | |
| 34 | stq $2, 16($sp); \ | |
| 35 | stq $3, 24($sp); \ | |
| 36 | stq $4, 32($sp); \ | |
| 37 | stq $28, 144($sp); \ | |
| 38 | lda $2, alpha_mv; \ | |
| 39 | stq $5, 40($sp); \ | |
| 40 | stq $6, 48($sp); \ | |
| 41 | stq $7, 56($sp); \ | |
| 42 | stq $8, 64($sp); \ | |
| 43 | stq $19, 72($sp); \ | |
| 44 | stq $20, 80($sp); \ | |
| 45 | stq $21, 88($sp); \ | |
| 46 | ldq $2, HAE_CACHE($2); \ | |
| 47 | stq $22, 96($sp); \ | |
| 48 | stq $23, 104($sp); \ | |
| 49 | stq $24, 112($sp); \ | |
| 50 | stq $25, 120($sp); \ | |
| 51 | stq $26, 128($sp); \ | |
| 52 | stq $27, 136($sp); \ | |
| 53 | stq $2, 152($sp); \ | |
| 54 | stq $16, 160($sp); \ | |
| 55 | stq $17, 168($sp); \ | |
| 56 | stq $18, 176($sp) | |
| 57 | ||
| 58 | #define RESTORE_ALL \ | |
| 59 | lda $19, alpha_mv; \ | |
| 60 | ldq $0, 0($sp); \ | |
| 61 | ldq $1, 8($sp); \ | |
| 62 | ldq $2, 16($sp); \ | |
| 63 | ldq $3, 24($sp); \ | |
| 64 | ldq $21, 152($sp); \ | |
| 65 | ldq $20, HAE_CACHE($19); \ | |
| 66 | ldq $4, 32($sp); \ | |
| 67 | ldq $5, 40($sp); \ | |
| 68 | ldq $6, 48($sp); \ | |
| 69 | ldq $7, 56($sp); \ | |
| 70 | subq $20, $21, $20; \ | |
| 71 | ldq $8, 64($sp); \ | |
| 72 | beq $20, 99f; \ | |
| 73 | ldq $20, HAE_REG($19); \ | |
| 74 | stq $21, HAE_CACHE($19); \ | |
| 75 | stq $21, 0($20); \ | |
| 76 | ldq $0, 0($sp); \ | |
| 77 | ldq $1, 8($sp); \ | |
| 78 | 99:; \ | |
| 79 | ldq $19, 72($sp); \ | |
| 80 | ldq $20, 80($sp); \ | |
| 81 | ldq $21, 88($sp); \ | |
| 82 | ldq $22, 96($sp); \ | |
| 83 | ldq $23, 104($sp); \ | |
| 84 | ldq $24, 112($sp); \ | |
| 85 | ldq $25, 120($sp); \ | |
| 86 | ldq $26, 128($sp); \ | |
| 87 | ldq $27, 136($sp); \ | |
| 88 | ldq $28, 144($sp); \ | |
| 89 | addq $sp, SP_OFF, $sp | |
| 90 | ||
| 91 | /* | |
| 92 | * Non-syscall kernel entry points. | |
| 93 | */ | |
| 94 | ||
| 95 | .align 4 | |
| 96 | .globl entInt | |
| 97 | .ent entInt | |
| 98 | entInt: | |
| 99 | SAVE_ALL | |
| 100 | lda $8, 0x3fff | |
| 101 | lda $26, ret_from_sys_call | |
| 102 | bic $sp, $8, $8 | |
| 103 | mov $sp, $19 | |
| 104 | jsr $31, do_entInt | |
| 105 | .end entInt | |
| 106 | ||
| 107 | .align 4 | |
| 108 | .globl entArith | |
| 109 | .ent entArith | |
| 110 | entArith: | |
| 111 | SAVE_ALL | |
| 112 | lda $8, 0x3fff | |
| 113 | lda $26, ret_from_sys_call | |
| 114 | bic $sp, $8, $8 | |
| 115 | mov $sp, $18 | |
| 116 | jsr $31, do_entArith | |
| 117 | .end entArith | |
| 118 | ||
| 119 | .align 4 | |
| 120 | .globl entMM | |
| 121 | .ent entMM | |
| 122 | entMM: | |
| 123 | SAVE_ALL | |
| 124 | /* save $9 - $15 so the inline exception code can manipulate them. */ | |
| 125 | subq $sp, 56, $sp | |
| 126 | stq $9, 0($sp) | |
| 127 | stq $10, 8($sp) | |
| 128 | stq $11, 16($sp) | |
| 129 | stq $12, 24($sp) | |
| 130 | stq $13, 32($sp) | |
| 131 | stq $14, 40($sp) | |
| 132 | stq $15, 48($sp) | |
| 133 | addq $sp, 56, $19 | |
| 134 | /* handle the fault */ | |
| 135 | lda $8, 0x3fff | |
| 136 | bic $sp, $8, $8 | |
| 137 | jsr $26, do_page_fault | |
| 138 | /* reload the registers after the exception code played. */ | |
| 139 | ldq $9, 0($sp) | |
| 140 | ldq $10, 8($sp) | |
| 141 | ldq $11, 16($sp) | |
| 142 | ldq $12, 24($sp) | |
| 143 | ldq $13, 32($sp) | |
| 144 | ldq $14, 40($sp) | |
| 145 | ldq $15, 48($sp) | |
| 146 | addq $sp, 56, $sp | |
| 147 | /* finish up the syscall as normal. */ | |
| 148 | br ret_from_sys_call | |
| 149 | .end entMM | |
| 150 | ||
| 151 | .align 4 | |
| 152 | .globl entIF | |
| 153 | .ent entIF | |
| 154 | entIF: | |
| 155 | SAVE_ALL | |
| 156 | lda $8, 0x3fff | |
| 157 | lda $26, ret_from_sys_call | |
| 158 | bic $sp, $8, $8 | |
| 159 | mov $sp, $17 | |
| 160 | jsr $31, do_entIF | |
| 161 | .end entIF | |
| 162 | ||
| 163 | .align 4 | |
| 164 | .globl entUna | |
| 165 | .ent entUna | |
| 166 | entUna: | |
| 167 | lda $sp, -256($sp) | |
| 168 | stq $0, 0($sp) | |
| 169 | ldq $0, 256($sp) /* get PS */ | |
| 170 | stq $1, 8($sp) | |
| 171 | stq $2, 16($sp) | |
| 172 | stq $3, 24($sp) | |
| 173 | and $0, 8, $0 /* user mode? */ | |
| 174 | stq $4, 32($sp) | |
| 175 | bne $0, entUnaUser /* yup -> do user-level unaligned fault */ | |
| 176 | stq $5, 40($sp) | |
| 177 | stq $6, 48($sp) | |
| 178 | stq $7, 56($sp) | |
| 179 | stq $8, 64($sp) | |
| 180 | stq $9, 72($sp) | |
| 181 | stq $10, 80($sp) | |
| 182 | stq $11, 88($sp) | |
| 183 | stq $12, 96($sp) | |
| 184 | stq $13, 104($sp) | |
| 185 | stq $14, 112($sp) | |
| 186 | stq $15, 120($sp) | |
| 187 | /* 16-18 PAL-saved */ | |
| 188 | stq $19, 152($sp) | |
| 189 | stq $20, 160($sp) | |
| 190 | stq $21, 168($sp) | |
| 191 | stq $22, 176($sp) | |
| 192 | stq $23, 184($sp) | |
| 193 | stq $24, 192($sp) | |
| 194 | stq $25, 200($sp) | |
| 195 | stq $26, 208($sp) | |
| 196 | stq $27, 216($sp) | |
| 197 | stq $28, 224($sp) | |
| d70ddac1 | 198 | mov $sp, $19 |
| 1da177e4 LT |
199 | stq $gp, 232($sp) |
| 200 | lda $8, 0x3fff | |
| 201 | stq $31, 248($sp) | |
| 202 | bic $sp, $8, $8 | |
| 203 | jsr $26, do_entUna | |
| 204 | ldq $0, 0($sp) | |
| 205 | ldq $1, 8($sp) | |
| 206 | ldq $2, 16($sp) | |
| 207 | ldq $3, 24($sp) | |
| 208 | ldq $4, 32($sp) | |
| 209 | ldq $5, 40($sp) | |
| 210 | ldq $6, 48($sp) | |
| 211 | ldq $7, 56($sp) | |
| 212 | ldq $8, 64($sp) | |
| 213 | ldq $9, 72($sp) | |
| 214 | ldq $10, 80($sp) | |
| 215 | ldq $11, 88($sp) | |
| 216 | ldq $12, 96($sp) | |
| 217 | ldq $13, 104($sp) | |
| 218 | ldq $14, 112($sp) | |
| 219 | ldq $15, 120($sp) | |
| 220 | /* 16-18 PAL-saved */ | |
| 221 | ldq $19, 152($sp) | |
| 222 | ldq $20, 160($sp) | |
| 223 | ldq $21, 168($sp) | |
| 224 | ldq $22, 176($sp) | |
| 225 | ldq $23, 184($sp) | |
| 226 | ldq $24, 192($sp) | |
| 227 | ldq $25, 200($sp) | |
| 228 | ldq $26, 208($sp) | |
| 229 | ldq $27, 216($sp) | |
| 230 | ldq $28, 224($sp) | |
| 231 | ldq $gp, 232($sp) | |
| 232 | lda $sp, 256($sp) | |
| 233 | call_pal PAL_rti | |
| 234 | .end entUna | |
| 235 | ||
| 236 | .align 4 | |
| 237 | .ent entUnaUser | |
| 238 | entUnaUser: | |
| 239 | ldq $0, 0($sp) /* restore original $0 */ | |
| 240 | lda $sp, 256($sp) /* pop entUna's stack frame */ | |
| 241 | SAVE_ALL /* setup normal kernel stack */ | |
| 242 | lda $sp, -56($sp) | |
| 243 | stq $9, 0($sp) | |
| 244 | stq $10, 8($sp) | |
| 245 | stq $11, 16($sp) | |
| 246 | stq $12, 24($sp) | |
| 247 | stq $13, 32($sp) | |
| 248 | stq $14, 40($sp) | |
| 249 | stq $15, 48($sp) | |
| 250 | lda $8, 0x3fff | |
| 251 | addq $sp, 56, $19 | |
| 252 | bic $sp, $8, $8 | |
| 253 | jsr $26, do_entUnaUser | |
| 254 | ldq $9, 0($sp) | |
| 255 | ldq $10, 8($sp) | |
| 256 | ldq $11, 16($sp) | |
| 257 | ldq $12, 24($sp) | |
| 258 | ldq $13, 32($sp) | |
| 259 | ldq $14, 40($sp) | |
| 260 | ldq $15, 48($sp) | |
| 261 | lda $sp, 56($sp) | |
| 262 | br ret_from_sys_call | |
| 263 | .end entUnaUser | |
| 264 | ||
| 265 | .align 4 | |
| 266 | .globl entDbg | |
| 267 | .ent entDbg | |
| 268 | entDbg: | |
| 269 | SAVE_ALL | |
| 270 | lda $8, 0x3fff | |
| 271 | lda $26, ret_from_sys_call | |
| 272 | bic $sp, $8, $8 | |
| 273 | mov $sp, $16 | |
| 274 | jsr $31, do_entDbg | |
| 275 | .end entDbg | |
| 276 | \f | |
| 277 | /* | |
| 278 | * The system call entry point is special. Most importantly, it looks | |
| 279 | * like a function call to userspace as far as clobbered registers. We | |
| 280 | * do preserve the argument registers (for syscall restarts) and $26 | |
| 281 | * (for leaf syscall functions). | |
| 282 | * | |
| 283 | * So much for theory. We don't take advantage of this yet. | |
| 284 | * | |
| 285 | * Note that a0-a2 are not saved by PALcode as with the other entry points. | |
| 286 | */ | |
| 287 | ||
| 288 | .align 4 | |
| 289 | .globl entSys | |
| 290 | .globl ret_from_sys_call | |
| 291 | .ent entSys | |
| 292 | entSys: | |
| 293 | SAVE_ALL | |
| 294 | lda $8, 0x3fff | |
| 295 | bic $sp, $8, $8 | |
| 296 | lda $4, NR_SYSCALLS($31) | |
| 297 | stq $16, SP_OFF+24($sp) | |
| 298 | lda $5, sys_call_table | |
| 299 | lda $27, sys_ni_syscall | |
| 300 | cmpult $0, $4, $4 | |
| 301 | ldl $3, TI_FLAGS($8) | |
| 302 | stq $17, SP_OFF+32($sp) | |
| 303 | s8addq $0, $5, $5 | |
| 304 | stq $18, SP_OFF+40($sp) | |
| 305 | blbs $3, strace | |
| 306 | beq $4, 1f | |
| 307 | ldq $27, 0($5) | |
| 308 | 1: jsr $26, ($27), alpha_ni_syscall | |
| 309 | ldgp $gp, 0($26) | |
| 310 | blt $0, $syscall_error /* the call failed */ | |
| 311 | stq $0, 0($sp) | |
| 312 | stq $31, 72($sp) /* a3=0 => no error */ | |
| 313 | ||
| 314 | .align 4 | |
| 315 | ret_from_sys_call: | |
| 316 | cmovne $26, 0, $19 /* $19 = 0 => non-restartable */ | |
| 317 | ldq $0, SP_OFF($sp) | |
| 318 | and $0, 8, $0 | |
| 319 | beq $0, restore_all | |
| 320 | ret_from_reschedule: | |
| 321 | /* Make sure need_resched and sigpending don't change between | |
| 322 | sampling and the rti. */ | |
| 323 | lda $16, 7 | |
| 324 | call_pal PAL_swpipl | |
| 325 | ldl $5, TI_FLAGS($8) | |
| 326 | and $5, _TIF_WORK_MASK, $2 | |
| 327 | bne $5, work_pending | |
| 328 | restore_all: | |
| 329 | RESTORE_ALL | |
| 330 | call_pal PAL_rti | |
| 331 | ||
| 332 | .align 3 | |
| 333 | $syscall_error: | |
| 334 | /* | |
| 335 | * Some system calls (e.g., ptrace) can return arbitrary | |
| 336 | * values which might normally be mistaken as error numbers. | |
| 337 | * Those functions must zero $0 (v0) directly in the stack | |
| 338 | * frame to indicate that a negative return value wasn't an | |
| 339 | * error number.. | |
| 340 | */ | |
| 341 | ldq $19, 0($sp) /* old syscall nr (zero if success) */ | |
| 342 | beq $19, $ret_success | |
| 343 | ||
| 344 | ldq $20, 72($sp) /* .. and this a3 */ | |
| 345 | subq $31, $0, $0 /* with error in v0 */ | |
| 346 | addq $31, 1, $1 /* set a3 for errno return */ | |
| 347 | stq $0, 0($sp) | |
| 348 | mov $31, $26 /* tell "ret_from_sys_call" we can restart */ | |
| 349 | stq $1, 72($sp) /* a3 for return */ | |
| 350 | br ret_from_sys_call | |
| 351 | ||
| 352 | $ret_success: | |
| 353 | stq $0, 0($sp) | |
| 354 | stq $31, 72($sp) /* a3=0 => no error */ | |
| 355 | br ret_from_sys_call | |
| 356 | .end entSys | |
| 357 | ||
| 358 | /* | |
| 359 | * Do all cleanup when returning from all interrupts and system calls. | |
| 360 | * | |
| 361 | * Arguments: | |
| 362 | * $5: TI_FLAGS. | |
| 363 | * $8: current. | |
| 364 | * $19: The old syscall number, or zero if this is not a return | |
| 365 | * from a syscall that errored and is possibly restartable. | |
| 366 | * $20: Error indication. | |
| 367 | */ | |
| 368 | ||
| 369 | .align 4 | |
| 370 | .ent work_pending | |
| 371 | work_pending: | |
| 372 | and $5, _TIF_NEED_RESCHED, $2 | |
| 373 | beq $2, $work_notifysig | |
| 374 | ||
| 375 | $work_resched: | |
| 376 | subq $sp, 16, $sp | |
| 377 | stq $19, 0($sp) /* save syscall nr */ | |
| 378 | stq $20, 8($sp) /* and error indication (a3) */ | |
| 379 | jsr $26, schedule | |
| 380 | ldq $19, 0($sp) | |
| 381 | ldq $20, 8($sp) | |
| 382 | addq $sp, 16, $sp | |
| 383 | /* Make sure need_resched and sigpending don't change between | |
| 384 | sampling and the rti. */ | |
| 385 | lda $16, 7 | |
| 386 | call_pal PAL_swpipl | |
| 387 | ldl $5, TI_FLAGS($8) | |
| 388 | and $5, _TIF_WORK_MASK, $2 | |
| 389 | beq $2, restore_all | |
| 390 | and $5, _TIF_NEED_RESCHED, $2 | |
| 391 | bne $2, $work_resched | |
| 392 | ||
| 393 | $work_notifysig: | |
| b927b3e2 | 394 | mov $sp, $16 |
| 1da177e4 | 395 | br $1, do_switch_stack |
| b927b3e2 RH |
396 | mov $sp, $17 |
| 397 | mov $5, $18 | |
| 1da177e4 LT |
398 | jsr $26, do_notify_resume |
| 399 | bsr $1, undo_switch_stack | |
| 400 | br restore_all | |
| 401 | .end work_pending | |
| 402 | ||
| 403 | /* | |
| 404 | * PTRACE syscall handler | |
| 405 | */ | |
| 406 | ||
| 407 | .align 4 | |
| 408 | .ent strace | |
| 409 | strace: | |
| 410 | /* set up signal stack, call syscall_trace */ | |
| 411 | bsr $1, do_switch_stack | |
| 412 | jsr $26, syscall_trace | |
| 413 | bsr $1, undo_switch_stack | |
| 414 | ||
| 415 | /* get the system call number and the arguments back.. */ | |
| 416 | ldq $0, 0($sp) | |
| 417 | ldq $16, SP_OFF+24($sp) | |
| 418 | ldq $17, SP_OFF+32($sp) | |
| 419 | ldq $18, SP_OFF+40($sp) | |
| 420 | ldq $19, 72($sp) | |
| 421 | ldq $20, 80($sp) | |
| 422 | ldq $21, 88($sp) | |
| 423 | ||
| 424 | /* get the system call pointer.. */ | |
| 425 | lda $1, NR_SYSCALLS($31) | |
| 426 | lda $2, sys_call_table | |
| 427 | lda $27, alpha_ni_syscall | |
| 428 | cmpult $0, $1, $1 | |
| 429 | s8addq $0, $2, $2 | |
| 430 | beq $1, 1f | |
| 431 | ldq $27, 0($2) | |
| 432 | 1: jsr $26, ($27), sys_gettimeofday | |
| 53293638 | 433 | ret_from_straced: |
| 1da177e4 LT |
434 | ldgp $gp, 0($26) |
| 435 | ||
| 436 | /* check return.. */ | |
| 437 | blt $0, $strace_error /* the call failed */ | |
| 438 | stq $31, 72($sp) /* a3=0 => no error */ | |
| 439 | $strace_success: | |
| 440 | stq $0, 0($sp) /* save return value */ | |
| 441 | ||
| 442 | bsr $1, do_switch_stack | |
| 443 | jsr $26, syscall_trace | |
| 444 | bsr $1, undo_switch_stack | |
| 445 | br $31, ret_from_sys_call | |
| 446 | ||
| 447 | .align 3 | |
| 448 | $strace_error: | |
| 449 | ldq $19, 0($sp) /* old syscall nr (zero if success) */ | |
| 450 | beq $19, $strace_success | |
| 451 | ldq $20, 72($sp) /* .. and this a3 */ | |
| 452 | ||
| 453 | subq $31, $0, $0 /* with error in v0 */ | |
| 454 | addq $31, 1, $1 /* set a3 for errno return */ | |
| 455 | stq $0, 0($sp) | |
| 456 | stq $1, 72($sp) /* a3 for return */ | |
| 457 | ||
| 458 | bsr $1, do_switch_stack | |
| 459 | mov $19, $9 /* save old syscall number */ | |
| 460 | mov $20, $10 /* save old a3 */ | |
| 461 | jsr $26, syscall_trace | |
| 462 | mov $9, $19 | |
| 463 | mov $10, $20 | |
| 464 | bsr $1, undo_switch_stack | |
| 465 | ||
| 466 | mov $31, $26 /* tell "ret_from_sys_call" we can restart */ | |
| 467 | br ret_from_sys_call | |
| 468 | .end strace | |
| 469 | \f | |
| 470 | /* | |
| 471 | * Save and restore the switch stack -- aka the balance of the user context. | |
| 472 | */ | |
| 473 | ||
| 474 | .align 4 | |
| 475 | .ent do_switch_stack | |
| 476 | do_switch_stack: | |
| 477 | lda $sp, -SWITCH_STACK_SIZE($sp) | |
| 478 | stq $9, 0($sp) | |
| 479 | stq $10, 8($sp) | |
| 480 | stq $11, 16($sp) | |
| 481 | stq $12, 24($sp) | |
| 482 | stq $13, 32($sp) | |
| 483 | stq $14, 40($sp) | |
| 484 | stq $15, 48($sp) | |
| 485 | stq $26, 56($sp) | |
| 486 | stt $f0, 64($sp) | |
| 487 | stt $f1, 72($sp) | |
| 488 | stt $f2, 80($sp) | |
| 489 | stt $f3, 88($sp) | |
| 490 | stt $f4, 96($sp) | |
| 491 | stt $f5, 104($sp) | |
| 492 | stt $f6, 112($sp) | |
| 493 | stt $f7, 120($sp) | |
| 494 | stt $f8, 128($sp) | |
| 495 | stt $f9, 136($sp) | |
| 496 | stt $f10, 144($sp) | |
| 497 | stt $f11, 152($sp) | |
| 498 | stt $f12, 160($sp) | |
| 499 | stt $f13, 168($sp) | |
| 500 | stt $f14, 176($sp) | |
| 501 | stt $f15, 184($sp) | |
| 502 | stt $f16, 192($sp) | |
| 503 | stt $f17, 200($sp) | |
| 504 | stt $f18, 208($sp) | |
| 505 | stt $f19, 216($sp) | |
| 506 | stt $f20, 224($sp) | |
| 507 | stt $f21, 232($sp) | |
| 508 | stt $f22, 240($sp) | |
| 509 | stt $f23, 248($sp) | |
| 510 | stt $f24, 256($sp) | |
| 511 | stt $f25, 264($sp) | |
| 512 | stt $f26, 272($sp) | |
| 513 | stt $f27, 280($sp) | |
| 514 | mf_fpcr $f0 # get fpcr | |
| 515 | stt $f28, 288($sp) | |
| 516 | stt $f29, 296($sp) | |
| 517 | stt $f30, 304($sp) | |
| 518 | stt $f0, 312($sp) # save fpcr in slot of $f31 | |
| 519 | ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state. | |
| 520 | ret $31, ($1), 1 | |
| 521 | .end do_switch_stack | |
| 522 | ||
| 523 | .align 4 | |
| 524 | .ent undo_switch_stack | |
| 525 | undo_switch_stack: | |
| 526 | ldq $9, 0($sp) | |
| 527 | ldq $10, 8($sp) | |
| 528 | ldq $11, 16($sp) | |
| 529 | ldq $12, 24($sp) | |
| 530 | ldq $13, 32($sp) | |
| 531 | ldq $14, 40($sp) | |
| 532 | ldq $15, 48($sp) | |
| 533 | ldq $26, 56($sp) | |
| 534 | ldt $f30, 312($sp) # get saved fpcr | |
| 535 | ldt $f0, 64($sp) | |
| 536 | ldt $f1, 72($sp) | |
| 537 | ldt $f2, 80($sp) | |
| 538 | ldt $f3, 88($sp) | |
| 539 | mt_fpcr $f30 # install saved fpcr | |
| 540 | ldt $f4, 96($sp) | |
| 541 | ldt $f5, 104($sp) | |
| 542 | ldt $f6, 112($sp) | |
| 543 | ldt $f7, 120($sp) | |
| 544 | ldt $f8, 128($sp) | |
| 545 | ldt $f9, 136($sp) | |
| 546 | ldt $f10, 144($sp) | |
| 547 | ldt $f11, 152($sp) | |
| 548 | ldt $f12, 160($sp) | |
| 549 | ldt $f13, 168($sp) | |
| 550 | ldt $f14, 176($sp) | |
| 551 | ldt $f15, 184($sp) | |
| 552 | ldt $f16, 192($sp) | |
| 553 | ldt $f17, 200($sp) | |
| 554 | ldt $f18, 208($sp) | |
| 555 | ldt $f19, 216($sp) | |
| 556 | ldt $f20, 224($sp) | |
| 557 | ldt $f21, 232($sp) | |
| 558 | ldt $f22, 240($sp) | |
| 559 | ldt $f23, 248($sp) | |
| 560 | ldt $f24, 256($sp) | |
| 561 | ldt $f25, 264($sp) | |
| 562 | ldt $f26, 272($sp) | |
| 563 | ldt $f27, 280($sp) | |
| 564 | ldt $f28, 288($sp) | |
| 565 | ldt $f29, 296($sp) | |
| 566 | ldt $f30, 304($sp) | |
| 567 | lda $sp, SWITCH_STACK_SIZE($sp) | |
| 568 | ret $31, ($1), 1 | |
| 569 | .end undo_switch_stack | |
| 570 | \f | |
| 571 | /* | |
| 572 | * The meat of the context switch code. | |
| 573 | */ | |
| 574 | ||
| 575 | .align 4 | |
| 576 | .globl alpha_switch_to | |
| 577 | .ent alpha_switch_to | |
| 578 | alpha_switch_to: | |
| 579 | .prologue 0 | |
| 580 | bsr $1, do_switch_stack | |
| 581 | call_pal PAL_swpctx | |
| 582 | lda $8, 0x3fff | |
| 583 | bsr $1, undo_switch_stack | |
| 584 | bic $sp, $8, $8 | |
| 585 | mov $17, $0 | |
| 586 | ret | |
| 587 | .end alpha_switch_to | |
| 588 | ||
| 589 | /* | |
| 590 | * New processes begin life here. | |
| 591 | */ | |
| 592 | ||
| 593 | .globl ret_from_fork | |
| 594 | .align 4 | |
| 595 | .ent ret_from_fork | |
| 596 | ret_from_fork: | |
| 597 | lda $26, ret_from_sys_call | |
| 598 | mov $17, $16 | |
| 599 | jmp $31, schedule_tail | |
| 600 | .end ret_from_fork | |
| 601 | ||
| 602 | /* | |
| 603 | * kernel_thread(fn, arg, clone_flags) | |
| 604 | */ | |
| 605 | .align 4 | |
| 606 | .globl kernel_thread | |
| 607 | .ent kernel_thread | |
| 608 | kernel_thread: | |
| 609 | /* We can be called from a module. */ | |
| 610 | ldgp $gp, 0($27) | |
| 611 | .prologue 1 | |
| 612 | subq $sp, SP_OFF+6*8, $sp | |
| 613 | br $1, 2f /* load start address */ | |
| 614 | ||
| 615 | /* We've now "returned" from a fake system call. */ | |
| 616 | unop | |
| 617 | blt $0, 1f /* error? */ | |
| 618 | ldi $1, 0x3fff | |
| 619 | beq $20, 1f /* parent or child? */ | |
| 620 | ||
| 621 | bic $sp, $1, $8 /* in child. */ | |
| 622 | jsr $26, ($27) | |
| 623 | ldgp $gp, 0($26) | |
| 624 | mov $0, $16 | |
| 625 | mov $31, $26 | |
| 626 | jmp $31, sys_exit | |
| 627 | ||
| 628 | 1: ret /* in parent. */ | |
| 629 | ||
| 630 | .align 4 | |
| 631 | 2: /* Fake a system call stack frame, as we can't do system calls | |
| 632 | from kernel space. Note that we store FN and ARG as they | |
| 633 | need to be set up in the child for the call. Also store $8 | |
| 634 | and $26 for use in the parent. */ | |
| 635 | stq $31, SP_OFF($sp) /* ps */ | |
| 636 | stq $1, SP_OFF+8($sp) /* pc */ | |
| 637 | stq $gp, SP_OFF+16($sp) /* gp */ | |
| 638 | stq $16, 136($sp) /* $27; FN for child */ | |
| 639 | stq $17, SP_OFF+24($sp) /* $16; ARG for child */ | |
| 640 | stq $8, 64($sp) /* $8 */ | |
| 641 | stq $26, 128($sp) /* $26 */ | |
| 642 | /* Avoid the HAE being gratuitously wrong, to avoid restoring it. */ | |
| 643 | ldq $2, alpha_mv+HAE_CACHE | |
| 644 | stq $2, 152($sp) /* HAE */ | |
| 645 | ||
| 646 | /* Shuffle FLAGS to the front; add CLONE_VM. */ | |
| 647 | ldi $1, CLONE_VM|CLONE_UNTRACED | |
| 648 | or $18, $1, $16 | |
| 649 | bsr $26, sys_clone | |
| 650 | ||
| 651 | /* We don't actually care for a3 success widgetry in the kernel. | |
| 652 | Not for positive errno values. */ | |
| 653 | stq $0, 0($sp) /* $0 */ | |
| 654 | br restore_all | |
| 655 | .end kernel_thread | |
| 656 | ||
| 657 | /* | |
| 3db03b4a | 658 | * kernel_execve(path, argv, envp) |
| 1da177e4 LT |
659 | */ |
| 660 | .align 4 | |
| 3db03b4a AB |
661 | .globl kernel_execve |
| 662 | .ent kernel_execve | |
| 663 | kernel_execve: | |
| 1da177e4 LT |
664 | /* We can be called from a module. */ |
| 665 | ldgp $gp, 0($27) | |
| 666 | lda $sp, -(32+SIZEOF_PT_REGS+8)($sp) | |
| 667 | .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0 | |
| 668 | stq $26, 0($sp) | |
| 669 | stq $16, 8($sp) | |
| 670 | stq $17, 16($sp) | |
| 671 | stq $18, 24($sp) | |
| 672 | .prologue 1 | |
| 673 | ||
| 674 | lda $16, 32($sp) | |
| 675 | lda $17, 0 | |
| 676 | lda $18, SIZEOF_PT_REGS | |
| 677 | bsr $26, memset !samegp | |
| 678 | ||
| 679 | /* Avoid the HAE being gratuitously wrong, which would cause us | |
| 680 | to do the whole turn off interrupts thing and restore it. */ | |
| 681 | ldq $2, alpha_mv+HAE_CACHE | |
| 682 | stq $2, 152+32($sp) | |
| 683 | ||
| 684 | ldq $16, 8($sp) | |
| 685 | ldq $17, 16($sp) | |
| 686 | ldq $18, 24($sp) | |
| 687 | lda $19, 32($sp) | |
| 688 | bsr $26, do_execve !samegp | |
| 689 | ||
| 690 | ldq $26, 0($sp) | |
| 691 | bne $0, 1f /* error! */ | |
| 692 | ||
| 693 | /* Move the temporary pt_regs struct from its current location | |
| 694 | to the top of the kernel stack frame. See copy_thread for | |
| 695 | details for a normal process. */ | |
| 696 | lda $16, 0x4000 - SIZEOF_PT_REGS($8) | |
| 697 | lda $17, 32($sp) | |
| 698 | lda $18, SIZEOF_PT_REGS | |
| 699 | bsr $26, memmove !samegp | |
| 700 | ||
| 701 | /* Take that over as our new stack frame and visit userland! */ | |
| 702 | lda $sp, 0x4000 - SIZEOF_PT_REGS($8) | |
| 703 | br $31, ret_from_sys_call | |
| 704 | ||
| 705 | 1: lda $sp, 32+SIZEOF_PT_REGS+8($sp) | |
| 706 | ret | |
| 3db03b4a | 707 | .end kernel_execve |
| 1da177e4 LT |
708 | |
| 709 | \f | |
| 710 | /* | |
| 711 | * Special system calls. Most of these are special in that they either | |
| 712 | * have to play switch_stack games or in some way use the pt_regs struct. | |
| 713 | */ | |
| 714 | .align 4 | |
| 715 | .globl sys_fork | |
| 716 | .ent sys_fork | |
| 717 | sys_fork: | |
| 718 | .prologue 0 | |
| 719 | mov $sp, $21 | |
| 720 | bsr $1, do_switch_stack | |
| 721 | bis $31, SIGCHLD, $16 | |
| 722 | mov $31, $17 | |
| 723 | mov $31, $18 | |
| 724 | mov $31, $19 | |
| 725 | mov $31, $20 | |
| 726 | jsr $26, alpha_clone | |
| 727 | bsr $1, undo_switch_stack | |
| 728 | ret | |
| 729 | .end sys_fork | |
| 730 | ||
| 731 | .align 4 | |
| 732 | .globl sys_clone | |
| 733 | .ent sys_clone | |
| 734 | sys_clone: | |
| 735 | .prologue 0 | |
| 736 | mov $sp, $21 | |
| 737 | bsr $1, do_switch_stack | |
| 738 | /* $16, $17, $18, $19, $20 come from the user. */ | |
| 739 | jsr $26, alpha_clone | |
| 740 | bsr $1, undo_switch_stack | |
| 741 | ret | |
| 742 | .end sys_clone | |
| 743 | ||
| 744 | .align 4 | |
| 745 | .globl sys_vfork | |
| 746 | .ent sys_vfork | |
| 747 | sys_vfork: | |
| 748 | .prologue 0 | |
| 749 | mov $sp, $16 | |
| 750 | bsr $1, do_switch_stack | |
| 751 | jsr $26, alpha_vfork | |
| 752 | bsr $1, undo_switch_stack | |
| 753 | ret | |
| 754 | .end sys_vfork | |
| 755 | ||
| 756 | .align 4 | |
| 757 | .globl sys_sigreturn | |
| 758 | .ent sys_sigreturn | |
| 759 | sys_sigreturn: | |
| 760 | .prologue 0 | |
| 53293638 AV |
761 | lda $9, ret_from_straced |
| 762 | cmpult $26, $9, $9 | |
| 1da177e4 LT |
763 | mov $sp, $17 |
| 764 | lda $18, -SWITCH_STACK_SIZE($sp) | |
| 765 | lda $sp, -SWITCH_STACK_SIZE($sp) | |
| 766 | jsr $26, do_sigreturn | |
| 53293638 AV |
767 | bne $9, 1f |
| 768 | jsr $26, syscall_trace | |
| 769 | 1: br $1, undo_switch_stack | |
| 1da177e4 LT |
770 | br ret_from_sys_call |
| 771 | .end sys_sigreturn | |
| 772 | ||
| 773 | .align 4 | |
| 774 | .globl sys_rt_sigreturn | |
| 775 | .ent sys_rt_sigreturn | |
| 776 | sys_rt_sigreturn: | |
| 777 | .prologue 0 | |
| 53293638 AV |
778 | lda $9, ret_from_straced |
| 779 | cmpult $26, $9, $9 | |
| 1da177e4 LT |
780 | mov $sp, $17 |
| 781 | lda $18, -SWITCH_STACK_SIZE($sp) | |
| 782 | lda $sp, -SWITCH_STACK_SIZE($sp) | |
| 783 | jsr $26, do_rt_sigreturn | |
| 53293638 AV |
784 | bne $9, 1f |
| 785 | jsr $26, syscall_trace | |
| 786 | 1: br $1, undo_switch_stack | |
| 1da177e4 LT |
787 | br ret_from_sys_call |
| 788 | .end sys_rt_sigreturn | |
| 789 | ||
| 1da177e4 LT |
790 | .align 4 |
| 791 | .globl sys_sethae | |
| 792 | .ent sys_sethae | |
| 793 | sys_sethae: | |
| 794 | .prologue 0 | |
| 795 | stq $16, 152($sp) | |
| 796 | ret | |
| 797 | .end sys_sethae | |
| 798 | ||
| 799 | .align 4 | |
| 800 | .globl osf_getpriority | |
| 801 | .ent osf_getpriority | |
| 802 | osf_getpriority: | |
| 803 | lda $sp, -16($sp) | |
| 804 | stq $26, 0($sp) | |
| 805 | .prologue 0 | |
| 806 | ||
| 807 | jsr $26, sys_getpriority | |
| 808 | ||
| 809 | ldq $26, 0($sp) | |
| 810 | blt $0, 1f | |
| 811 | ||
| 812 | /* Return value is the unbiased priority, i.e. 20 - prio. | |
| 813 | This does result in negative return values, so signal | |
| 814 | no error by writing into the R0 slot. */ | |
| 815 | lda $1, 20 | |
| 816 | stq $31, 16($sp) | |
| 817 | subl $1, $0, $0 | |
| 818 | unop | |
| 819 | ||
| 820 | 1: lda $sp, 16($sp) | |
| 821 | ret | |
| 822 | .end osf_getpriority | |
| 823 | ||
| 824 | .align 4 | |
| 825 | .globl sys_getxuid | |
| 826 | .ent sys_getxuid | |
| 827 | sys_getxuid: | |
| 828 | .prologue 0 | |
| 829 | ldq $2, TI_TASK($8) | |
| b6dff3ec DH |
830 | ldq $3, TASK_CRED($2) |
| 831 | ldl $0, CRED_UID($3) | |
| 832 | ldl $1, CRED_EUID($3) | |
| 1da177e4 LT |
833 | stq $1, 80($sp) |
| 834 | ret | |
| 835 | .end sys_getxuid | |
| 836 | ||
| 837 | .align 4 | |
| 838 | .globl sys_getxgid | |
| 839 | .ent sys_getxgid | |
| 840 | sys_getxgid: | |
| 841 | .prologue 0 | |
| 842 | ldq $2, TI_TASK($8) | |
| b6dff3ec DH |
843 | ldq $3, TASK_CRED($2) |
| 844 | ldl $0, CRED_GID($3) | |
| 845 | ldl $1, CRED_EGID($3) | |
| 1da177e4 LT |
846 | stq $1, 80($sp) |
| 847 | ret | |
| 848 | .end sys_getxgid | |
| 849 | ||
| 850 | .align 4 | |
| 851 | .globl sys_getxpid | |
| 852 | .ent sys_getxpid | |
| 853 | sys_getxpid: | |
| 854 | .prologue 0 | |
| 855 | ldq $2, TI_TASK($8) | |
| 856 | ||
| 857 | /* See linux/kernel/timer.c sys_getppid for discussion | |
| 858 | about this loop. */ | |
| 9a5e7339 EB |
859 | ldq $3, TASK_GROUP_LEADER($2) |
| 860 | ldq $4, TASK_REAL_PARENT($3) | |
| 861 | ldl $0, TASK_TGID($2) | |
| 862 | 1: ldl $1, TASK_TGID($4) | |
| 1da177e4 | 863 | #ifdef CONFIG_SMP |
| 9a5e7339 | 864 | mov $4, $5 |
| 1da177e4 | 865 | mb |
| 9a5e7339 EB |
866 | ldq $3, TASK_GROUP_LEADER($2) |
| 867 | ldq $4, TASK_REAL_PARENT($3) | |
| 868 | cmpeq $4, $5, $5 | |
| 869 | beq $5, 1b | |
| 1da177e4 LT |
870 | #endif |
| 871 | stq $1, 80($sp) | |
| 1da177e4 LT |
872 | ret |
| 873 | .end sys_getxpid | |
| 874 | ||
| 875 | .align 4 | |
| 1134723e HC |
876 | .globl sys_alpha_pipe |
| 877 | .ent sys_alpha_pipe | |
| 878 | sys_alpha_pipe: | |
| 1da177e4 LT |
879 | lda $sp, -16($sp) |
| 880 | stq $26, 0($sp) | |
| 881 | .prologue 0 | |
| 882 | ||
| 10f303ae | 883 | mov $31, $17 |
| 1da177e4 | 884 | lda $16, 8($sp) |
| 10f303ae | 885 | jsr $26, do_pipe_flags |
| 1da177e4 LT |
886 | |
| 887 | ldq $26, 0($sp) | |
| 888 | bne $0, 1f | |
| 889 | ||
| 890 | /* The return values are in $0 and $20. */ | |
| 891 | ldl $1, 12($sp) | |
| 892 | ldl $0, 8($sp) | |
| 893 | ||
| 894 | stq $1, 80+16($sp) | |
| 895 | 1: lda $sp, 16($sp) | |
| 896 | ret | |
| 1134723e | 897 | .end sys_alpha_pipe |
| 1da177e4 | 898 | |
| 1da177e4 LT |
899 | .align 4 |
| 900 | .globl sys_execve | |
| 901 | .ent sys_execve | |
| 902 | sys_execve: | |
| 903 | .prologue 0 | |
| 904 | mov $sp, $19 | |
| 905 | jmp $31, do_sys_execve | |
| 906 | .end sys_execve | |
| 907 | ||
| 908 | .align 4 | |
| 909 | .globl osf_sigprocmask | |
| 910 | .ent osf_sigprocmask | |
| 911 | osf_sigprocmask: | |
| 912 | .prologue 0 | |
| 913 | mov $sp, $18 | |
| e5d9a90c | 914 | jmp $31, sys_osf_sigprocmask |
| 1da177e4 LT |
915 | .end osf_sigprocmask |
| 916 | ||
| 917 | .align 4 | |
| 918 | .globl alpha_ni_syscall | |
| 919 | .ent alpha_ni_syscall | |
| 920 | alpha_ni_syscall: | |
| 921 | .prologue 0 | |
| 922 | /* Special because it also implements overflow handling via | |
| 923 | syscall number 0. And if you recall, zero is a special | |
| 924 | trigger for "not an error". Store large non-zero there. */ | |
| 925 | lda $0, -ENOSYS | |
| 926 | unop | |
| 927 | stq $0, 0($sp) | |
| 928 | ret | |
| 929 | .end alpha_ni_syscall |