[thirdparty/glibc.git] / sysdeps / arm / setjmp.S

/* setjmp for ARM.
   Copyright (C) 1997-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <stap-probe.h>
#include <bits/setjmp.h>
#include <rtld-global-offsets.h>
#include <arm-features.h>

ENTRY (__sigsetjmp)
#ifdef PTR_MANGLE
	PTR_MANGLE_LOAD (a3, ip)
#endif
	mov	ip, r0

	/* setjmp probe expects sigsetjmp first argument (4@r0), second
	   argument (-4@r1), and target address (4@r14), respectively.  */
	LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14)

	/* Save sp and lr */
#ifdef PTR_MANGLE
	mov	a4, sp
	PTR_MANGLE2 (a4, a4, a3)
	str	a4, [ip], #4
	PTR_MANGLE2 (a4, lr, a3)
	str	a4, [ip], #4
#else
	str	sp, [ip], #4
	str	lr, [ip], #4
#endif
	/* Save registers */
	stmia	ip!, JMP_BUF_REGLIST

#if !defined ARM_ASSUME_NO_IWMMXT || defined __SOFTFP__
# define NEED_HWCAP 1
#endif

#ifdef NEED_HWCAP
	/* Check if we have a VFP unit.  */
# if IS_IN (rtld)
	LDST_PCREL (ldr, a3, a4, \
		    C_SYMBOL_NAME(_rtld_local_ro) \
		    + RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
# else
#  ifdef SHARED
	LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \
		    RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
#  else
	LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_dl_hwcap), 0)
#  endif
# endif
#endif

#ifdef __SOFTFP__
	tst	a3, #HWCAP_ARM_VFP
	beq	.Lno_vfp
#endif

	/* Store the VFP registers.
	   Don't use VFP instructions directly because this code
	   is used in non-VFP multilibs.  */
	/* Following instruction is vstmia ip!, {d8-d15}.  */
	stc	p11, cr8, [ip], #64
.Lno_vfp:

#ifndef ARM_ASSUME_NO_IWMMXT
	tst	a3, #HWCAP_ARM_IWMMXT
	beq	.Lno_iwmmxt

	/* Save the call-preserved iWMMXt registers.  */
	/* Following instructions are wstrd wr10, [ip], #8 (etc.)  */
	stcl	p1, cr10, [r12], #8
	stcl	p1, cr11, [r12], #8
	stcl	p1, cr12, [r12], #8
	stcl	p1, cr13, [r12], #8
	stcl	p1, cr14, [r12], #8
	stcl	p1, cr15, [r12], #8
.Lno_iwmmxt:
#endif

	/* Make a tail call to __sigjmp_save; it takes the same args.  */
	B	PLTJMP(C_SYMBOL_NAME(__sigjmp_save))

END (__sigsetjmp)

hidden_def (__sigsetjmp)
Commit	Line	Data
f10eff58	1	/* setjmp for ARM.
2b778ceb	2	Copyright (C) 1997-2021 Free Software Foundation, Inc.
f10eff58 DJ	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
22423683	15	You should have received a copy of the GNU Lesser General Public
ab84e3ff	16	License along with the GNU C Library. If not, see
5a82c748	17	<https://www.gnu.org/licenses/>. */
f10eff58 DJ	18
f10eff58 DJ	19	#include <sysdep.h>
80a56cc3	20	#include <stap-probe.h>
f10eff58	21	#include <bits/setjmp.h>
f10eff58	22	#include <rtld-global-offsets.h>
2aa5b9c1	23	#include <arm-features.h>
f10eff58 DJ	24
f10eff58 DJ	25	ENTRY (__sigsetjmp)
b7f2d27d	26	#ifdef PTR_MANGLE
2f10c4d6	27	PTR_MANGLE_LOAD (a3, ip)
b7f2d27d	28	#endif
f10eff58 DJ	29	mov ip, r0
f10eff58 DJ	30
80a56cc3 WN	31	/* setjmp probe expects sigsetjmp first argument (4@r0), second
	32	argument (-4@r1), and target address (4@r14), respectively. */
	33	LIBC_PROBE (setjmp, 3, 4@r0, -4@r1, 4@r14)
	34
	35	/* Save sp and lr */
b7f2d27d	36	#ifdef PTR_MANGLE
41bc5e09 WN	37	mov a4, sp
41bc5e09 WN	38	PTR_MANGLE2 (a4, a4, a3)
81cb7a0b	39	str a4, [ip], #4
b7f2d27d	40	PTR_MANGLE2 (a4, lr, a3)
81cb7a0b	41	str a4, [ip], #4
b7f2d27d	42	#else
81cb7a0b ZW	43	str sp, [ip], #4
81cb7a0b ZW	44	str lr, [ip], #4
b7f2d27d	45	#endif
80a56cc3	46	/* Save registers */
81cb7a0b	47	stmia ip!, JMP_BUF_REGLIST
f10eff58	48
2aa5b9c1 RM	49	#if !defined ARM_ASSUME_NO_IWMMXT \|\| defined __SOFTFP__
	50	# define NEED_HWCAP 1
	51	#endif
	52
	53	#ifdef NEED_HWCAP
f10eff58	54	/* Check if we have a VFP unit. */
a3848485	55	# if IS_IN (rtld)
8c2b1ed8 RM	56	LDST_PCREL (ldr, a3, a4, \
	57	C_SYMBOL_NAME(_rtld_local_ro) \
	58	+ RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
2aa5b9c1	59	# else
3ee57869	60	# ifdef SHARED
8c2b1ed8 RM	61	LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_rtld_global_ro), \
8c2b1ed8 RM	62	RTLD_GLOBAL_RO_DL_HWCAP_OFFSET)
2aa5b9c1	63	# else
8c2b1ed8	64	LDR_GLOBAL (a3, a4, C_SYMBOL_NAME(_dl_hwcap), 0)
2aa5b9c1 RM	65	# endif
2aa5b9c1 RM	66	# endif
f10eff58 DJ	67	#endif
f10eff58 DJ	68
6dcf80c7	69	#ifdef __SOFTFP__
4b860fb9	70	tst a3, #HWCAP_ARM_VFP
6dcf80c7 RM	71	beq .Lno_vfp
6dcf80c7 RM	72	#endif
f10eff58	73
fbc4c20a AS	74	/* Store the VFP registers.
	75	Don't use VFP instructions directly because this code
	76	is used in non-VFP multilibs. */
	77	/* Following instruction is vstmia ip!, {d8-d15}. */
81cb7a0b	78	stc p11, cr8, [ip], #64
6dcf80c7	79	.Lno_vfp:
f10eff58	80
2aa5b9c1	81	#ifndef ARM_ASSUME_NO_IWMMXT
4b860fb9	82	tst a3, #HWCAP_ARM_IWMMXT
6dcf80c7	83	beq .Lno_iwmmxt
4b860fb9 DJ	84
	85	/* Save the call-preserved iWMMXt registers. */
	86	/* Following instructions are wstrd wr10, [ip], #8 (etc.) */
81cb7a0b ZW	87	stcl p1, cr10, [r12], #8
	88	stcl p1, cr11, [r12], #8
	89	stcl p1, cr12, [r12], #8
	90	stcl p1, cr13, [r12], #8
	91	stcl p1, cr14, [r12], #8
	92	stcl p1, cr15, [r12], #8
6dcf80c7	93	.Lno_iwmmxt:
2aa5b9c1	94	#endif
4b860fb9	95
f10eff58 DJ	96	/* Make a tail call to __sigjmp_save; it takes the same args. */
	97	B PLTJMP(C_SYMBOL_NAME(__sigjmp_save))
	98
f10eff58 DJ	99	END (__sigsetjmp)
f10eff58 DJ	100
5de92c17	101	hidden_def (__sigsetjmp)