[apple/libplatform.git] / src / setjmp / arm64 / setjmp.s

/*
 * Copyright (c) 2011-2018 Apple Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */

#define	JMP_r19_20	#0x00
#define	JMP_r21_22	#0x10
#define	JMP_r23_24	#0x20
#define	JMP_r25_26	#0x30
#define	JMP_r27_28	#0x40
#define	JMP_fp_lr	#0x50
#define	JMP_sp_rsvd	#0x60 /* second field is reserved/unused */
#define	JMP_d8_d9	#0x70
#define	JMP_d10_d11	#0x80
#define	JMP_d12_d13	#0x90
#define	JMP_d14_d15	#0xA0
#define	JMP_sig		#0xB0
#define	JMP_sigflag	#0xB8

#include <architecture/arm/asm_help.h>
#include <os/tsd.h>


/* int _setjmp(jmp_buf env); */
ENTRY_POINT(__setjmp)
	_OS_PTR_MUNGE_TOKEN(x16, x16)
	_OS_PTR_MUNGE(x10, fp, x16)
	_OS_PTR_MUNGE(x11, lr, x16)
	mov		x12, sp
	_OS_PTR_MUNGE(x12, x12, x16)
	stp		x19, x20,	[x0, JMP_r19_20]
	stp		x21, x22,	[x0, JMP_r21_22]
	stp		x23, x24,	[x0, JMP_r23_24]
	stp		x25, x26,	[x0, JMP_r25_26]
	stp		x27, x28,	[x0, JMP_r27_28]
	stp		x10, x11,	[x0, JMP_fp_lr]
	str		x12,		[x0, JMP_sp_rsvd]
	stp		d8, d9,		[x0, JMP_d8_d9]
	stp		d10, d11,	[x0, JMP_d10_d11]
	stp		d12, d13,	[x0, JMP_d12_d13]
	stp		d14, d15,	[x0, JMP_d14_d15]
	mov		w0, #0
	ret

/* void _longjmp(jmp_buf env, int val); */
ENTRY_POINT(__longjmp)
	_OS_PTR_MUNGE_TOKEN(x16, x16)
	ldp		x19, x20,	[x0, JMP_r19_20]
	ldp		x21, x22,	[x0, JMP_r21_22]
	ldp		x23, x24,	[x0, JMP_r23_24]
	ldp		x25, x26,	[x0, JMP_r25_26]
	ldp		x27, x28,	[x0, JMP_r27_28]
	ldp		x10, x11,	[x0, JMP_fp_lr]
	ldr		x12,		[x0, JMP_sp_rsvd]
	ldp		d8, d9,		[x0, JMP_d8_d9]
	ldp		d10, d11,	[x0, JMP_d10_d11]
	ldp		d12, d13,	[x0, JMP_d12_d13]
	ldp		d14, d15,	[x0, JMP_d14_d15]
	_OS_PTR_UNMUNGE(fp, x10, x16)
	_OS_PTR_UNMUNGE(lr, x11, x16)
	_OS_PTR_UNMUNGE(x12, x12, x16)
	mov		sp, x12
	cmp		w1, #0
	csinc	w0, w1, wzr, ne
	ret

/* int sigsetjmp(sigjmp_buf env, int savemask); */
ENTRY_POINT(_sigsetjmp)
	str		w1, [x0, JMP_sigflag]
	cbnz	w1, 1f
	b		__setjmp
1:
	/* else, fall through */

/* int setjmp(jmp_buf env); */
ENTRY_POINT(_setjmp)
	stp		x21, lr, [x0]
	mov		x21, x0

	orr		w0, wzr, #0x1
	mov		x1, #0
	add		x2, x21, JMP_sig
	CALL_EXTERNAL(_sigprocmask)

	mov		x0, x21
	ldp		x21, lr, [x0]
	b		__setjmp


/* void siglongjmp(sigjmp_buf env, int val); */
ENTRY_POINT(_siglongjmp)
	ldr		w8, [x0, JMP_sigflag]
	cbnz	w8, 1f
	b		__longjmp
1:
	/* else, fall through */

/* void longjmp(jmp_buf env, int val); */
ENTRY_POINT(_longjmp)
	sub     sp, sp, #16
	mov		x21, x0					// x21/x22 will be restored by __longjmp
	mov		x22, x1
	ldr		x8, [x21, JMP_sig]		// restore the signal mask
	str     x8, [sp, #8]
	orr     w0, wzr, #0x3			// SIG_SETMASK
	add     x1, sp, #8				// set
	mov		x2, #0					// oset
	CALL_EXTERNAL(_sigprocmask)
	mov		x0, x21
	mov		x1, x22
	add     sp, sp, #16
	b		__longjmp
Commit	Line	Data
ada7c492	1	/*
438624e0	2	* Copyright (c) 2011-2018 Apple Inc. All rights reserved.
ada7c492 A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23
	24	#define JMP_r19_20 #0x00
	25	#define JMP_r21_22 #0x10
	26	#define JMP_r23_24 #0x20
	27	#define JMP_r25_26 #0x30
	28	#define JMP_r27_28 #0x40
438624e0 A	29	#define JMP_fp_lr #0x50
438624e0 A	30	#define JMP_sp_rsvd #0x60 /* second field is reserved/unused */
ada7c492 A	31	#define JMP_d8_d9 #0x70
	32	#define JMP_d10_d11 #0x80
	33	#define JMP_d12_d13 #0x90
	34	#define JMP_d14_d15 #0xA0
	35	#define JMP_sig #0xB0
	36	#define JMP_sigflag #0xB8
	37
	38	#include <architecture/arm/asm_help.h>
438624e0 A	39	#include <os/tsd.h>
438624e0 A	40
ada7c492 A	41
	42	/* int _setjmp(jmp_buf env); */
	43	ENTRY_POINT(__setjmp)
438624e0 A	44	_OS_PTR_MUNGE_TOKEN(x16, x16)
	45	_OS_PTR_MUNGE(x10, fp, x16)
	46	_OS_PTR_MUNGE(x11, lr, x16)
	47	mov x12, sp
	48	_OS_PTR_MUNGE(x12, x12, x16)
ada7c492 A	49	stp x19, x20, [x0, JMP_r19_20]
	50	stp x21, x22, [x0, JMP_r21_22]
	51	stp x23, x24, [x0, JMP_r23_24]
	52	stp x25, x26, [x0, JMP_r25_26]
	53	stp x27, x28, [x0, JMP_r27_28]
438624e0 A	54	stp x10, x11, [x0, JMP_fp_lr]
438624e0 A	55	str x12, [x0, JMP_sp_rsvd]
ada7c492 A	56	stp d8, d9, [x0, JMP_d8_d9]
	57	stp d10, d11, [x0, JMP_d10_d11]
	58	stp d12, d13, [x0, JMP_d12_d13]
	59	stp d14, d15, [x0, JMP_d14_d15]
438624e0	60	mov w0, #0
ada7c492 A	61	ret
	62
	63	/* void _longjmp(jmp_buf env, int val); */
	64	ENTRY_POINT(__longjmp)
438624e0	65	_OS_PTR_MUNGE_TOKEN(x16, x16)
ada7c492 A	66	ldp x19, x20, [x0, JMP_r19_20]
	67	ldp x21, x22, [x0, JMP_r21_22]
	68	ldp x23, x24, [x0, JMP_r23_24]
	69	ldp x25, x26, [x0, JMP_r25_26]
	70	ldp x27, x28, [x0, JMP_r27_28]
438624e0 A	71	ldp x10, x11, [x0, JMP_fp_lr]
438624e0 A	72	ldr x12, [x0, JMP_sp_rsvd]
ada7c492 A	73	ldp d8, d9, [x0, JMP_d8_d9]
	74	ldp d10, d11, [x0, JMP_d10_d11]
	75	ldp d12, d13, [x0, JMP_d12_d13]
	76	ldp d14, d15, [x0, JMP_d14_d15]
438624e0 A	77	_OS_PTR_UNMUNGE(fp, x10, x16)
	78	_OS_PTR_UNMUNGE(lr, x11, x16)
	79	_OS_PTR_UNMUNGE(x12, x12, x16)
	80	mov sp, x12
	81	cmp w1, #0
	82	csinc w0, w1, wzr, ne
	83	ret
ada7c492 A	84
	85	/* int sigsetjmp(sigjmp_buf env, int savemask); */
	86	ENTRY_POINT(_sigsetjmp)
438624e0 A	87	str w1, [x0, JMP_sigflag]
438624e0 A	88	cbnz w1, 1f
ada7c492 A	89	b __setjmp
	90	1:
	91	/* else, fall through */
	92
	93	/* int setjmp(jmp_buf env); */
	94	ENTRY_POINT(_setjmp)
	95	stp x21, lr, [x0]
	96	mov x21, x0
438624e0 A	97
438624e0 A	98	orr w0, wzr, #0x1
ada7c492 A	99	mov x1, #0
	100	add x2, x21, JMP_sig
	101	CALL_EXTERNAL(_sigprocmask)
	102
	103	mov x0, x21
	104	ldp x21, lr, [x0]
	105	b __setjmp
	106
438624e0	107
ada7c492 A	108	/* void siglongjmp(sigjmp_buf env, int val); */
ada7c492 A	109	ENTRY_POINT(_siglongjmp)
438624e0 A	110	ldr w8, [x0, JMP_sigflag]
438624e0 A	111	cbnz w8, 1f
ada7c492 A	112	b __longjmp
	113	1:
	114	/* else, fall through */
	115
	116	/* void longjmp(jmp_buf env, int val); */
	117	ENTRY_POINT(_longjmp)
	118	sub sp, sp, #16
	119	mov x21, x0 // x21/x22 will be restored by __longjmp
	120	mov x22, x1
438624e0 A	121	ldr x8, [x21, JMP_sig] // restore the signal mask
438624e0 A	122	str x8, [sp, #8]
ada7c492	123	orr w0, wzr, #0x3 // SIG_SETMASK
438624e0 A	124	add x1, sp, #8 // set
438624e0 A	125	mov x2, #0 // oset
ada7c492 A	126	CALL_EXTERNAL(_sigprocmask)
	127	mov x0, x21
	128	mov x1, x22
	129	add sp, sp, #16
	130	b __longjmp