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/* $NetBSD: setjmp.S,v 1.17 2013/11/30 20:20:42 joerg Exp $ */
/*
* Copyright (c) 1997 Mark Brinicombe
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS)
#error FPA is not supported anymore
#endif
#if defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP)
.fpu vfp
#endif
#include <machine/asm.h>
#include <machine/setjmp.h>
/*
* C library -- setjmp, longjmp
*
* longjmp(a,v)
* will generate a "return(v)" from the last call to
* setjmp(a)
* by restoring registers from the stack.
* The previous signal state is restored.
*/
ENTRY(__setjmp14)
/* Get the signal mask. */
push {r0-r2, lr}
#if !defined(__thumb__)
adds r2, r0, #(_JB_SIGMASK * 4)
#else
mov r2, r0
adds r2, r2, #(_JB_SIGMASK * 4)
#endif
movs r1, #0
movs r0, #0
bl PLT_SYM(_C_LABEL(__sigprocmask14))
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
pop {r0-r2, lr}
#else
pop {r0-r3}
mov lr, r3
#endif
ldr r1, .Lsetjmp_magic
#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
ldr r2, .Lfpu_present
#ifdef __PIC__
add r2, r2, pc /* pc = &.LPIC0 */
#endif
ldr r2, [r2]
.LPIC0:
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
cbz r2, 1f /* don't save if we don't have a FPU */
#else
cmp r2, #0 /* do we have a FPU? */
beq 1f /* no, don't save VFP registers */
#endif
orrs r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
/* change magic to VFP magic */
adds r2, r0, #(_JB_REG_D8 * 4)
vstmia r2, {d8-d15}
vmrs r2, fpscr
str r2, [r0, #(_JB_REG_FPSCR * 4)]
1:
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */
str r1, [r0] /* store magic */
/* Store integer registers */
adds r0, r0, #(_JB_REG_R4 * 4)
#if !defined(__thumb__)
stmia r0!, {r4-lr}
#else
stmia r0!, {r4-r7}
mov r2, r8
mov r3, r9
stmia r0!, {r2-r3}
mov r2, r10
mov r3, r11
stmia r0!, {r2-r3}
mov r2, sp
mov r3, lr
str r2, [r0, #4]
str r3, [r0, #8]
#endif
movs r0, #0
RET
#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
.align 0
.Lfpu_present:
.word REL_SYM(_libc_arm_fpu_present, .LPIC0)
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */
END(__setjmp14)
ENTRY(__longjmp14)
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
ldr r2, [r0]
ldr ip, .Lsetjmp_magic
bic r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
#else
ldr r3, .Lsetjmp_magic
mov ip, r3
ldr r3, [r0]
movs r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
bics r3, r2
/* r2 is not the magic but we don't need it since we can't do VFP */
#endif
cmp r3, ip
bne .Lbotch
/* Restore the signal mask. */
push {r0-r2, lr}
movs r2, #0
#if !defined(__thumb__)
adds r1, r0, #(_JB_SIGMASK * 4)
#else
mov r1, r0
adds r1, r1, #(_JB_SIGMASK * 4)
#endif
movs r0, #3 /* SIG_SETMASK */
bl PLT_SYM(_C_LABEL(__sigprocmask14))
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
pop {r0-r2, lr}
#else
pop {r0-r3}
mov lr, r3
#endif
#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
tst r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
/* is this a VFP magic? */
beq 1f /* no, don't restore VFP */
adds r2, r0, #(_JB_REG_D8 * 4)
vldmia r2, {d8-d15}
ldr r2, [r0, #(_JB_REG_FPSCR * 4)]
vmsr fpscr, r2
1:
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */
adds r0, r0, #(_JB_REG_R4 * 4)
/* Restore integer registers */
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
ldmia r0!, {r4-r12}
#else
ldmia r0!, {r4-r7}
ldmia r0!, {r2-r3}
mov r8, r2
mov r9, r3
ldmia r0!, {r2-r3}
mov r10, r2
mov r11, r3
adds r0, r0, #4 /* skip ip(r12) */
#endif
ldmia r0!, {r2-r3}
/* Validate sp and lr */
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
cbz r2, .Lbotch
#else
cmp r2, #0
beq .Lbotch
#endif
mov sp, r2
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
cbz r3, .Lbotch
#else
cmp r3, #0
beq .Lbotch
#endif
mov lr, r3
/* Set return value */
movs r0, r1
#if !defined(__thumb__)
moveq r0, #1
#else
bne 1f
movs r0, #1
1:
#endif
RET
/* validation failed, die die die. */
.Lbotch:
bl PLT_SYM(_C_LABEL(longjmperror))
bl PLT_SYM(_C_LABEL(abort))
1: b 1b /* Cannot get here */
.align 0
.Lsetjmp_magic:
.word _JB_MAGIC_SETJMP
END(__longjmp14)
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