1 /* $NetBSD: _setjmp.S,v 1.12 2013/04/19 13:45:45 matt Exp $ */
4 * Copyright (c) 1997 Mark Brinicombe
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Mark Brinicombe
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS)
36 #error FPA is not supported anymore
39 #if defined(__ARM_EABI__) && !defined(_STANDALONE)
43 #include <machine/asm.h>
44 #include <machine/setjmp.h>
46 __FBSDID("$FreeBSD$");
49 * C library -- _setjmp, _longjmp
52 * will generate a "return(v)" from the last call to
54 * by restoring registers from the stack.
55 * The previous signal state is NOT restored.
57 * Note: r0 is the return value
58 * r1-r3,ip are scratch registers in functions
62 ldr r1, .L_setjmp_magic
64 #if defined(__ARM_EABI__) && !defined(_STANDALONE)
67 GOT_INIT(r3, .L_setjmp_got, .L_setjmp_gotinit)
72 teq r2, #0 /* do we have a FPU? */
73 beq 1f /* no, don't save VFP registers */
75 orr r1, r1, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
76 /* change magic to VFP magic */
77 add r2, r0, #(_JB_REG_D8 * 4)
80 str r2, [r0, #(_JB_REG_FPSCR * 4)]
82 #endif /* __ARM_EABI__ */
86 add r0, r0, #(_JB_REG_R4 * 4)
87 /* Store integer registers */
95 .word _JB_MAGIC__SETJMP
96 #if defined(__ARM_EABI__) && !defined(_STANDALONE)
97 GOT_INITSYM(.L_setjmp_got, .L_setjmp_gotinit)
99 .word PIC_SYM(_libc_arm_fpu_present, GOTOFF)
100 #endif /* __ARM_EABI__ */
102 WEAK_ALIAS(___longjmp, _longjmp)
104 ldr r2, [r0] /* get magic from jmp_buf */
105 bic r3, r2, #(_JB_MAGIC__SETJMP ^ _JB_MAGIC__SETJMP_VFP)
106 /* ignore VFP-ness of magic */
107 ldr ip, .L_setjmp_magic /* load magic */
108 teq ip, r3 /* magic correct? */
109 bne botch /* no, botch */
111 #if defined(__ARM_EABI__) && !defined(_STANDALONE)
112 teq r3, r2 /* did magic change? */
113 beq 1f /* no, don't restore VFP */
114 add ip, r0, #(_JB_REG_D8 * 4)
116 ldr ip, [r0, #(_JB_REG_FPSCR * 4)]
119 #endif /* __ARM_EABI__ */
121 add r0, r0, #(_JB_REG_R4 * 4)
122 /* Restore integer registers */
125 /* Validate sp and r14 */
130 /* Set return value */
132 moveq r0, #0x00000001
135 /* validation failed, die die die. */
137 #if !defined(_STANDALONE)
138 bl PIC_SYM(_C_LABEL(longjmperror), PLT)
139 bl PIC_SYM(_C_LABEL(abort), PLT)
140 b . - 8 /* Cannot get here */