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)
138 	.cfi_restore	$8
149 	.cfi_adjust_cfa_offset	-SP_OFF
155 	.cfi_rel_offset	$9, 0
156 	.cfi_rel_offset	$10, 8
166 	.cfi_restore	$9
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.  */
203 	stq	$9, 0($sp)
204 	stq	$10, 8($sp)
210 	.cfi_rel_offset	$9, 0
211 	.cfi_rel_offset	$10, 8
219 	lda	$8, 0x3fff
220 	bic	$sp, $8, $8
223 	ldq	$9, 0($sp)
224 	ldq	$10, 8($sp)
231 	.cfi_restore	$9
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)
269 	stq	$9, 72($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)
328 	ldq	$9, 72($sp)
335 	/* 16-18 PAL-saved */
355 	.cfi_restore	$8
356 	.cfi_restore	$9
374 	.cfi_adjust_cfa_offset	-256
383 	.cfi_adjust_cfa_offset	-256
385 	lda	$sp, -56($sp)
387 	stq	$9, 0($sp)
388 	stq	$10, 8($sp)
394 	.cfi_rel_offset	$9, 0
395 	.cfi_rel_offset	$10, 8
401 	lda	$8, 0x3fff
403 	bic	$sp, $8, $8
405 	ldq	$9, 0($sp)
406 	ldq	$10, 8($sp)
413 	.cfi_restore	$9
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)
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)
538  *       $8: current.
577 	ldl	$1, TI_STATUS($8)
581 	stl	$2, TI_STATUS($8)
631 	mov	$18, $9		/* save old syscall number */
634 	mov	$9, $18
643  * Save and restore the switch stack -- aka the balance of the user context.
653 	lda	$sp, -SWITCH_STACK_SIZE($sp)
655 	stq	$9, 0($sp)
656 	stq	$10, 8($sp)
665 	.size	do_switch_stack, .-do_switch_stack
673 	ldq	$9, 0($sp)
674 	ldq	$10, 8($sp)
684 	.size	undo_switch_stack, .-undo_switch_stack
686 #define FR(n) n * 8 + TI_FP($8)
694 	V( 8); V( 9); V(10); V(11)
705 	.size	__save_fpu, .-__save_fpu
717 	V( 8); V( 9); V(10); V(11)
723 1:	stl $2, TI_STATUS($8)
737 	ldl	$1, TI_STATUS($8)
742 	stl	$2, TI_STATUS($8)
747 	lda	$8, 0x3fff
749 	bic	$sp, $8, $8
753 	.size	alpha_switch_to, .-alpha_switch_to
769  * ... and new kernel threads - here
777 	mov	$9, $27
779 	jsr	$26, ($9)
797 	ldl	$1, TI_STATUS($8)
801 	stl	$2, TI_STATUS($8)
822 	lda	$9, ret_from_straced
823 	cmpult	$26, $9, $9
824 	lda	$sp, -SWITCH_STACK_SIZE($sp)
826 	bne	$9, 1f
846 	   Store a non-zero there - -ENOSYS we need in register
849 	lda	$0, -ENOSYS