alpha/kernel/entry.S

1 /* SPDX-License-Identifier: GPL-2.0 */
5  * Kernel entry-points.
8 #include <asm/asm-offsets.h>
30 	.cfi_rel_offset	64, 8
39 	.size	\func, . - \func
43  * This defines the normal kernel pt-regs layout.
45  * regs 9-15 preserved by C code
46  * regs 16-18 saved by PAL-code
47  * regs 29-30 saved and set up by PAL-code
48  * JRP - Save regs 16-18 in a special area of the stack, so that
49  * the palcode-provided values are available to the signal handler.
56 	stq	$1, 8($sp)
62 	.cfi_rel_offset $1, 8
71 	stq	$8, 64($sp)
89 	.cfi_rel_offset	$8, 64
104 	ldq	$1, 8($sp)
114 	ldq	$8, 64($sp)
131 	.cfi_restore	$1
138 	.cfi_restore	$8
149 	.cfi_adjust_cfa_offset	-SP_OFF
153 	bsr	$1, do_switch_stack
156 	.cfi_rel_offset	$10, 8
165 	bsr	$1, undo_switch_stack
173 	.cfi_adjust_cfa_offset	-SWITCH_STACK_SIZE
177  * Non-syscall kernel entry points.
182 	lda	$8, 0x3fff
184 	bic	$sp, $8, $8
191 	lda	$8, 0x3fff
193 	bic	$sp, $8, $8
200 /* save $9 - $15 so the inline exception code can manipulate them.  */
204 	stq	$10, 8($sp)
211 	.cfi_rel_offset	$10, 8
219 	lda	$8, 0x3fff
220 	bic	$sp, $8, $8
224 	ldq	$10, 8($sp)
238 	.cfi_adjust_cfa_offset	-56
245 	lda	$8, 0x3fff
247 	bic	$sp, $8, $8
253 	lda	$sp, -256($sp)
259 	stq	$1, 8($sp)
262 	and	$0, 8, $0		/* user mode? */
264 	bne	$0, entUnaUser	/* yup -> do user-level unaligned fault */
268 	stq	$8, 64($sp)
276 	/* 16-18 PAL-saved */
289 	.cfi_rel_offset	$1, 1*8
290 	.cfi_rel_offset	$2, 2*8
291 	.cfi_rel_offset	$3, 3*8
292 	.cfi_rel_offset	$4, 4*8
293 	.cfi_rel_offset	$5, 5*8
294 	.cfi_rel_offset	$6, 6*8
295 	.cfi_rel_offset	$7, 7*8
296 	.cfi_rel_offset	$8, 8*8
297 	.cfi_rel_offset	$9, 9*8
298 	.cfi_rel_offset	$10, 10*8
299 	.cfi_rel_offset	$11, 11*8
300 	.cfi_rel_offset	$12, 12*8
301 	.cfi_rel_offset	$13, 13*8
302 	.cfi_rel_offset	$14, 14*8
303 	.cfi_rel_offset	$15, 15*8
304 	.cfi_rel_offset	$19, 19*8
305 	.cfi_rel_offset	$20, 20*8
306 	.cfi_rel_offset	$21, 21*8
307 	.cfi_rel_offset	$22, 22*8
308 	.cfi_rel_offset	$23, 23*8
309 	.cfi_rel_offset	$24, 24*8
310 	.cfi_rel_offset	$25, 25*8
311 	.cfi_rel_offset	$26, 26*8
312 	.cfi_rel_offset	$27, 27*8
313 	.cfi_rel_offset	$28, 28*8
314 	.cfi_rel_offset	$29, 29*8
315 	lda	$8, 0x3fff
317 	bic	$sp, $8, $8
320 	ldq	$1, 8($sp)
327 	ldq	$8, 64($sp)
335 	/* 16-18 PAL-saved */
348 	.cfi_restore	$1
355 	.cfi_restore	$8
374 	.cfi_adjust_cfa_offset	-256
383 	.cfi_adjust_cfa_offset	-256
385 	lda	$sp, -56($sp)
388 	stq	$10, 8($sp)
395 	.cfi_rel_offset	$10, 8
401 	lda	$8, 0x3fff
403 	bic	$sp, $8, $8
406 	ldq	$10, 8($sp)
420 	.cfi_adjust_cfa_offset	-56
426 	lda	$8, 0x3fff
428 	bic	$sp, $8, $8
441  * Note that a0-a2 are not saved by PALcode as with the other entry points.
450 	.cfi_rel_offset	64, 8
454 	lda	$8, 0x3fff
455 	bic	$sp, $8, $8
461 	ldl	$3, TI_FLAGS($8)
475 	beq	$4, 1f
477 1:	jsr	$26, ($27), sys_ni_syscall
482 	stq	$31, 72($sp)		/* a3=0 => no error */
487 	cmovne	$26, 0, $18		/* $18 = 0 => non-restartable */
489 	and	$0, 8, $0
496 	ldl	$17, TI_FLAGS($8)
500 	ldl	$2, TI_STATUS($8)
528 	addq	$31, 1, $1	/* set a3 for errno return */
531 	stq	$1, 72($sp)	/* a3 for return */
538  *       $8: current.
554 	 * or got through work_notifysig already.  Either case means no syscall
577 	ldl	$1, TI_STATUS($8)
578 	and	$1, TS_SAVED_FP, $3
579 	or	$1, TS_SAVED_FP, $2
580 	bne	$3, 1f
581 	stl	$2, TI_STATUS($8)
583 1:
597 	lda	$1, NR_syscalls($31)
600 	cmpult	$0, $1, $1
602 	beq	$1, 1f
604 1:	jsr	$26, ($27), sys_gettimeofday
611 	stq	$31, 72($sp)		/* a3=0 => no error */
626 	addq	$31, 1, $1	/* set a3 for errno return */
628 	stq	$1, 72($sp)	/* a3 for return */
643  * Save and restore the switch stack -- aka the balance of the user context.
651 	.cfi_register 64, $1
653 	lda	$sp, -SWITCH_STACK_SIZE($sp)
656 	stq	$10, 8($sp)
663 	ret	$31, ($1), 1
665 	.size	do_switch_stack, .-do_switch_stack
671 	.cfi_register 64, $1
674 	ldq	$10, 8($sp)
682 	ret	$31, ($1), 1
684 	.size	undo_switch_stack, .-undo_switch_stack
686 #define FR(n) n * 8 + TI_FP($8)
691 #define V(n) stt	$f##n, FR(n)  macro
692 	V( 0); V( 1); V( 2); V( 3)
693 	V( 4); V( 5); V( 6); V( 7)
694 	V( 8); V( 9); V(10); V(11)
695 	V(12); V(13); V(14); V(15)
696 	V(16); V(17); V(18); V(19)
697 	V(20); V(21); V(22); V(23)
698 	V(24); V(25); V(26); V(27)
700 	V(28); V(29); V(30)
704 #undef V
705 	.size	__save_fpu, .-__save_fpu
711 	beq	$3, 1f
712 #define V(n) ldt	$f##n, FR(n)  macro
714 	V( 0); V( 1); V( 2); V( 3)
716 	V( 4); V( 5); V( 6); V( 7)
717 	V( 8); V( 9); V(10); V(11)
718 	V(12); V(13); V(14); V(15)
719 	V(16); V(17); V(18); V(19)
720 	V(20); V(21); V(22); V(23)
721 	V(24); V(25); V(26); V(27)
722 	V(28); V(29); V(30)
723 1:	stl $2, TI_STATUS($8)
725 #undef V
737 	ldl	$1, TI_STATUS($8)
738 	and	$1, TS_RESTORE_FP, $3
739 	bne	$3, 1f
740 	or	$1, TS_RESTORE_FP | TS_SAVED_FP, $2
741 	and	$1, TS_SAVED_FP, $3
742 	stl	$2, TI_STATUS($8)
743 	bne	$3, 1f
745 1:
747 	lda	$8, 0x3fff
749 	bic	$sp, $8, $8
753 	.size	alpha_switch_to, .-alpha_switch_to
769  * ... and new kernel threads - here
795 	bsr	$1, do_switch_stack
797 	ldl	$1, TI_STATUS($8)
798 	and	$1, TS_SAVED_FP, $3
799 	or	$1, TS_SAVED_FP, $2
800 	bne	$3, 1f
801 	stl	$2, TI_STATUS($8)
803 1:
824 	lda	$sp, -SWITCH_STACK_SIZE($sp)
826 	bne	$9, 1f
828 1:	br	$1, undo_switch_stack
846 	   Store a non-zero there - -ENOSYS we need in register
849 	lda	$0, -ENOSYS