alpha/kernel/entry.S

1 /* SPDX-License-Identifier: GPL-2.0 */
5  * Kernel entry-points.
8 #include <asm/asm-offsets.h>
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.
149 	.cfi_adjust_cfa_offset	-SP_OFF
161 	.cfi_rel_offset	$15, 48
172 	.cfi_restore	$15
173 	.cfi_adjust_cfa_offset	-SWITCH_STACK_SIZE
177  * Non-syscall kernel entry points.
200 /* save $9 - $15 so the inline exception code can manipulate them.  */
209 	stq	$15, 48($sp)
216 	.cfi_rel_offset	$15, 48
229 	ldq	$15, 48($sp)
237 	.cfi_restore	$15
238 	.cfi_adjust_cfa_offset	-56
253 	lda	$sp, -256($sp)
264 	bne	$0, entUnaUser	/* yup -> do user-level unaligned fault */
275 	stq	$15, 120($sp)
276 	/* 16-18 PAL-saved */
303 	.cfi_rel_offset	$15, 15*8
334 	ldq	$15, 120($sp)
335 	/* 16-18 PAL-saved */
362 	.cfi_restore	$15
374 	.cfi_adjust_cfa_offset	-256
383 	.cfi_adjust_cfa_offset	-256
385 	lda	$sp, -56($sp)
393 	stq	$15, 48($sp)
400 	.cfi_rel_offset	$15, 48
411 	ldq	$15, 48($sp)
419 	.cfi_restore	$15
420 	.cfi_adjust_cfa_offset	-56
441  * Note that a0-a2 are not saved by PALcode as with the other entry points.
487 	cmovne	$26, 0, $18		/* $18 = 0 => non-restartable */
643  * Save and restore the switch stack -- aka the balance of the user context.
653 	lda	$sp, -SWITCH_STACK_SIZE($sp)
661 	stq	$15, 48($sp)
665 	.size	do_switch_stack, .-do_switch_stack
679 	ldq	$15, 48($sp)
684 	.size	undo_switch_stack, .-undo_switch_stack
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
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)
725 #undef V
753 	.size	alpha_switch_to, .-alpha_switch_to
769  * ... and new kernel threads - here
824 	lda	$sp, -SWITCH_STACK_SIZE($sp)
846 	   Store a non-zero there - -ENOSYS we need in register
849 	lda	$0, -ENOSYS