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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/alpha/kernel/entry.S
Linux-2.6.12-rc2v2.6.12-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!
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diff --git a/arch/alpha/kernel/entry.S b/arch/alpha/kernel/entry.S
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1/*
2 * arch/alpha/kernel/entry.S
3 *
4 * Kernel entry-points.
5 */
6
7#include <linux/config.h>
8#include <asm/asm_offsets.h>
9#include <asm/thread_info.h>
10#include <asm/pal.h>
11#include <asm/errno.h>
12#include <asm/unistd.h>
13
14 .text
15 .set noat
16
17/* Stack offsets. */
18#define SP_OFF 184
19#define SWITCH_STACK_SIZE 320
20
21/*
22 * This defines the normal kernel pt-regs layout.
23 *
24 * regs 9-15 preserved by C code
25 * regs 16-18 saved by PAL-code
26 * regs 29-30 saved and set up by PAL-code
27 * JRP - Save regs 16-18 in a special area of the stack, so that
28 * the palcode-provided values are available to the signal handler.
29 */
30
31#define SAVE_ALL \
32 subq $sp, SP_OFF, $sp; \
33 stq $0, 0($sp); \
34 stq $1, 8($sp); \
35 stq $2, 16($sp); \
36 stq $3, 24($sp); \
37 stq $4, 32($sp); \
38 stq $28, 144($sp); \
39 lda $2, alpha_mv; \
40 stq $5, 40($sp); \
41 stq $6, 48($sp); \
42 stq $7, 56($sp); \
43 stq $8, 64($sp); \
44 stq $19, 72($sp); \
45 stq $20, 80($sp); \
46 stq $21, 88($sp); \
47 ldq $2, HAE_CACHE($2); \
48 stq $22, 96($sp); \
49 stq $23, 104($sp); \
50 stq $24, 112($sp); \
51 stq $25, 120($sp); \
52 stq $26, 128($sp); \
53 stq $27, 136($sp); \
54 stq $2, 152($sp); \
55 stq $16, 160($sp); \
56 stq $17, 168($sp); \
57 stq $18, 176($sp)
58
59#define RESTORE_ALL \
60 lda $19, alpha_mv; \
61 ldq $0, 0($sp); \
62 ldq $1, 8($sp); \
63 ldq $2, 16($sp); \
64 ldq $3, 24($sp); \
65 ldq $21, 152($sp); \
66 ldq $20, HAE_CACHE($19); \
67 ldq $4, 32($sp); \
68 ldq $5, 40($sp); \
69 ldq $6, 48($sp); \
70 ldq $7, 56($sp); \
71 subq $20, $21, $20; \
72 ldq $8, 64($sp); \
73 beq $20, 99f; \
74 ldq $20, HAE_REG($19); \
75 stq $21, HAE_CACHE($19); \
76 stq $21, 0($20); \
77 ldq $0, 0($sp); \
78 ldq $1, 8($sp); \
7999:; \
80 ldq $19, 72($sp); \
81 ldq $20, 80($sp); \
82 ldq $21, 88($sp); \
83 ldq $22, 96($sp); \
84 ldq $23, 104($sp); \
85 ldq $24, 112($sp); \
86 ldq $25, 120($sp); \
87 ldq $26, 128($sp); \
88 ldq $27, 136($sp); \
89 ldq $28, 144($sp); \
90 addq $sp, SP_OFF, $sp
91
92/*
93 * Non-syscall kernel entry points.
94 */
95
96 .align 4
97 .globl entInt
98 .ent entInt
99entInt:
100 SAVE_ALL
101 lda $8, 0x3fff
102 lda $26, ret_from_sys_call
103 bic $sp, $8, $8
104 mov $sp, $19
105 jsr $31, do_entInt
106.end entInt
107
108 .align 4
109 .globl entArith
110 .ent entArith
111entArith:
112 SAVE_ALL
113 lda $8, 0x3fff
114 lda $26, ret_from_sys_call
115 bic $sp, $8, $8
116 mov $sp, $18
117 jsr $31, do_entArith
118.end entArith
119
120 .align 4
121 .globl entMM
122 .ent entMM
123entMM:
124 SAVE_ALL
125/* save $9 - $15 so the inline exception code can manipulate them. */
126 subq $sp, 56, $sp
127 stq $9, 0($sp)
128 stq $10, 8($sp)
129 stq $11, 16($sp)
130 stq $12, 24($sp)
131 stq $13, 32($sp)
132 stq $14, 40($sp)
133 stq $15, 48($sp)
134 addq $sp, 56, $19
135/* handle the fault */
136 lda $8, 0x3fff
137 bic $sp, $8, $8
138 jsr $26, do_page_fault
139/* reload the registers after the exception code played. */
140 ldq $9, 0($sp)
141 ldq $10, 8($sp)
142 ldq $11, 16($sp)
143 ldq $12, 24($sp)
144 ldq $13, 32($sp)
145 ldq $14, 40($sp)
146 ldq $15, 48($sp)
147 addq $sp, 56, $sp
148/* finish up the syscall as normal. */
149 br ret_from_sys_call
150.end entMM
151
152 .align 4
153 .globl entIF
154 .ent entIF
155entIF:
156 SAVE_ALL
157 lda $8, 0x3fff
158 lda $26, ret_from_sys_call
159 bic $sp, $8, $8
160 mov $sp, $17
161 jsr $31, do_entIF
162.end entIF
163
164 .align 4
165 .globl entUna
166 .ent entUna
167entUna:
168 lda $sp, -256($sp)
169 stq $0, 0($sp)
170 ldq $0, 256($sp) /* get PS */
171 stq $1, 8($sp)
172 stq $2, 16($sp)
173 stq $3, 24($sp)
174 and $0, 8, $0 /* user mode? */
175 stq $4, 32($sp)
176 bne $0, entUnaUser /* yup -> do user-level unaligned fault */
177 stq $5, 40($sp)
178 stq $6, 48($sp)
179 stq $7, 56($sp)
180 stq $8, 64($sp)
181 stq $9, 72($sp)
182 stq $10, 80($sp)
183 stq $11, 88($sp)
184 stq $12, 96($sp)
185 stq $13, 104($sp)
186 stq $14, 112($sp)
187 stq $15, 120($sp)
188 /* 16-18 PAL-saved */
189 stq $19, 152($sp)
190 stq $20, 160($sp)
191 stq $21, 168($sp)
192 stq $22, 176($sp)
193 stq $23, 184($sp)
194 stq $24, 192($sp)
195 stq $25, 200($sp)
196 stq $26, 208($sp)
197 stq $27, 216($sp)
198 stq $28, 224($sp)
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
238entUnaUser:
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
268entDbg:
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
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
292entSys:
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)
3081: 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
315ret_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
320ret_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 $5, work_pending
328restore_all:
329 RESTORE_ALL
330 call_pal PAL_rti
331
332 .align 3
333$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
371work_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:
394 mov $sp, $17
395 br $1, do_switch_stack
396 mov $5, $21
397 mov $sp, $18
398 mov $31, $16
399 jsr $26, do_notify_resume
400 bsr $1, undo_switch_stack
401 br restore_all
402.end work_pending
403
404/*
405 * PTRACE syscall handler
406 */
407
408 .align 4
409 .ent strace
410strace:
411 /* set up signal stack, call syscall_trace */
412 bsr $1, do_switch_stack
413 jsr $26, syscall_trace
414 bsr $1, undo_switch_stack
415
416 /* get the system call number and the arguments back.. */
417 ldq $0, 0($sp)
418 ldq $16, SP_OFF+24($sp)
419 ldq $17, SP_OFF+32($sp)
420 ldq $18, SP_OFF+40($sp)
421 ldq $19, 72($sp)
422 ldq $20, 80($sp)
423 ldq $21, 88($sp)
424
425 /* get the system call pointer.. */
426 lda $1, NR_SYSCALLS($31)
427 lda $2, sys_call_table
428 lda $27, alpha_ni_syscall
429 cmpult $0, $1, $1
430 s8addq $0, $2, $2
431 beq $1, 1f
432 ldq $27, 0($2)
4331: jsr $26, ($27), sys_gettimeofday
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
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
476do_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
525undo_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
571/*
572 * The meat of the context switch code.
573 */
574
575 .align 4
576 .globl alpha_switch_to
577 .ent alpha_switch_to
578alpha_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
596ret_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
608kernel_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
6281: ret /* in parent. */
629
630 .align 4
6312: /* 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/*
658 * execve(path, argv, envp)
659 */
660 .align 4
661 .globl execve
662 .ent execve
663execve:
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
7051: lda $sp, 32+SIZEOF_PT_REGS+8($sp)
706 ret
707.end execve
708
709
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
717sys_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
734sys_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
747sys_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
759sys_sigreturn:
760 .prologue 0
761 mov $sp, $17
762 lda $18, -SWITCH_STACK_SIZE($sp)
763 lda $sp, -SWITCH_STACK_SIZE($sp)
764 jsr $26, do_sigreturn
765 br $1, undo_switch_stack
766 br ret_from_sys_call
767.end sys_sigreturn
768
769 .align 4
770 .globl sys_rt_sigreturn
771 .ent sys_rt_sigreturn
772sys_rt_sigreturn:
773 .prologue 0
774 mov $sp, $17
775 lda $18, -SWITCH_STACK_SIZE($sp)
776 lda $sp, -SWITCH_STACK_SIZE($sp)
777 jsr $26, do_rt_sigreturn
778 br $1, undo_switch_stack
779 br ret_from_sys_call
780.end sys_rt_sigreturn
781
782 .align 4
783 .globl sys_sigsuspend
784 .ent sys_sigsuspend
785sys_sigsuspend:
786 .prologue 0
787 mov $sp, $17
788 br $1, do_switch_stack
789 mov $sp, $18
790 subq $sp, 16, $sp
791 stq $26, 0($sp)
792 jsr $26, do_sigsuspend
793 ldq $26, 0($sp)
794 lda $sp, SWITCH_STACK_SIZE+16($sp)
795 ret
796.end sys_sigsuspend
797
798 .align 4
799 .globl sys_rt_sigsuspend
800 .ent sys_rt_sigsuspend
801sys_rt_sigsuspend:
802 .prologue 0
803 mov $sp, $18
804 br $1, do_switch_stack
805 mov $sp, $19
806 subq $sp, 16, $sp
807 stq $26, 0($sp)
808 jsr $26, do_rt_sigsuspend
809 ldq $26, 0($sp)
810 lda $sp, SWITCH_STACK_SIZE+16($sp)
811 ret
812.end sys_rt_sigsuspend
813
814 .align 4
815 .globl sys_sethae
816 .ent sys_sethae
817sys_sethae:
818 .prologue 0
819 stq $16, 152($sp)
820 ret
821.end sys_sethae
822
823 .align 4
824 .globl osf_getpriority
825 .ent osf_getpriority
826osf_getpriority:
827 lda $sp, -16($sp)
828 stq $26, 0($sp)
829 .prologue 0
830
831 jsr $26, sys_getpriority
832
833 ldq $26, 0($sp)
834 blt $0, 1f
835
836 /* Return value is the unbiased priority, i.e. 20 - prio.
837 This does result in negative return values, so signal
838 no error by writing into the R0 slot. */
839 lda $1, 20
840 stq $31, 16($sp)
841 subl $1, $0, $0
842 unop
843
8441: lda $sp, 16($sp)
845 ret
846.end osf_getpriority
847
848 .align 4
849 .globl sys_getxuid
850 .ent sys_getxuid
851sys_getxuid:
852 .prologue 0
853 ldq $2, TI_TASK($8)
854 ldl $0, TASK_UID($2)
855 ldl $1, TASK_EUID($2)
856 stq $1, 80($sp)
857 ret
858.end sys_getxuid
859
860 .align 4
861 .globl sys_getxgid
862 .ent sys_getxgid
863sys_getxgid:
864 .prologue 0
865 ldq $2, TI_TASK($8)
866 ldl $0, TASK_GID($2)
867 ldl $1, TASK_EGID($2)
868 stq $1, 80($sp)
869 ret
870.end sys_getxgid
871
872 .align 4
873 .globl sys_getxpid
874 .ent sys_getxpid
875sys_getxpid:
876 .prologue 0
877 ldq $2, TI_TASK($8)
878
879 /* See linux/kernel/timer.c sys_getppid for discussion
880 about this loop. */
881 ldq $3, TASK_REAL_PARENT($2)
8821: ldl $1, TASK_TGID($3)
883#ifdef CONFIG_SMP
884 mov $3, $4
885 mb
886 ldq $3, TASK_REAL_PARENT($2)
887 cmpeq $3, $4, $4
888 beq $4, 1b
889#endif
890 stq $1, 80($sp)
891 ldl $0, TASK_TGID($2)
892 ret
893.end sys_getxpid
894
895 .align 4
896 .globl sys_pipe
897 .ent sys_pipe
898sys_pipe:
899 lda $sp, -16($sp)
900 stq $26, 0($sp)
901 .prologue 0
902
903 lda $16, 8($sp)
904 jsr $26, do_pipe
905
906 ldq $26, 0($sp)
907 bne $0, 1f
908
909 /* The return values are in $0 and $20. */
910 ldl $1, 12($sp)
911 ldl $0, 8($sp)
912
913 stq $1, 80+16($sp)
9141: lda $sp, 16($sp)
915 ret
916.end sys_pipe
917
918 .align 4
919 .globl sys_ptrace
920 .ent sys_ptrace
921sys_ptrace:
922 .prologue 0
923 mov $sp, $20
924 jmp $31, do_sys_ptrace
925.end sys_ptrace
926
927 .align 4
928 .globl sys_execve
929 .ent sys_execve
930sys_execve:
931 .prologue 0
932 mov $sp, $19
933 jmp $31, do_sys_execve
934.end sys_execve
935
936 .align 4
937 .globl osf_sigprocmask
938 .ent osf_sigprocmask
939osf_sigprocmask:
940 .prologue 0
941 mov $sp, $18
942 jmp $31, do_osf_sigprocmask
943.end osf_sigprocmask
944
945 .align 4
946 .globl alpha_ni_syscall
947 .ent alpha_ni_syscall
948alpha_ni_syscall:
949 .prologue 0
950 /* Special because it also implements overflow handling via
951 syscall number 0. And if you recall, zero is a special
952 trigger for "not an error". Store large non-zero there. */
953 lda $0, -ENOSYS
954 unop
955 stq $0, 0($sp)
956 ret
957.end alpha_ni_syscall
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-27 10:39:26 -0500