154 lines
4.2 KiB
ArmAsm
154 lines
4.2 KiB
ArmAsm
/* $OpenBSD: setjmp.S,v 1.2 2004/02/01 05:40:52 drahn Exp $ */
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/* $NetBSD: setjmp.S,v 1.5 2003/04/05 23:08:51 bjh21 Exp $ */
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/*
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* Copyright (c) 1997 Mark Brinicombe
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* Copyright (c) 2010 Android Open Source Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mark Brinicombe
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <private/bionic_asm.h>
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#include <machine/setjmp.h>
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#include <machine/cpu-features.h>
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/*
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* C library -- setjmp, longjmp
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*
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* longjmp(a,v)
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* will generate a "return(v)" from the last call to
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* setjmp(a)
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* by restoring registers from the stack.
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* The previous signal state is restored.
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*/
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ENTRY(setjmp)
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/* Block all signals and retrieve the old signal mask */
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stmfd sp!, {r0, r14}
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.cfi_def_cfa_offset 8
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.cfi_rel_offset r0, 0
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.cfi_rel_offset r14, 4
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mov r0, #0x00000000
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bl PIC_SYM(sigblock, PLT)
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mov r1, r0
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ldmfd sp!, {r0, r14}
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.cfi_def_cfa_offset 0
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/* Store signal mask */
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str r1, [r0, #(_JB_SIGMASK * 4)]
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ldr r1, .Lsetjmp_magic
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str r1, [r0, #(_JB_MAGIC * 4)]
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/* Store core registers */
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add r1, r0, #(_JB_CORE_BASE * 4)
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stmia r1, {r4-r14}
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#ifdef __ARM_HAVE_VFP
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/* Store floating-point registers */
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add r1, r0, #(_JB_FLOAT_BASE * 4)
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vstmia r1, {d8-d15}
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/* Store floating-point state */
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fmrx r1, fpscr
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str r1, [r0, #(_JB_FLOAT_STATE * 4)]
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#endif /* __ARM_HAVE_VFP */
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mov r0, #0x00000000
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bx lr
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END(setjmp)
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.Lsetjmp_magic:
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.word _JB_MAGIC_SETJMP
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ENTRY(longjmp)
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ldr r2, .Lsetjmp_magic
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ldr r3, [r0, #(_JB_MAGIC * 4)]
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teq r2, r3
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bne botch
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/* Fetch signal mask */
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ldr r2, [r0, #(_JB_SIGMASK * 4)]
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/* Set signal mask */
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stmfd sp!, {r0, r1, r14}
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.cfi_def_cfa_offset 12
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.cfi_rel_offset r0, 0
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.cfi_rel_offset r1, 4
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.cfi_rel_offset r14, 8
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sub sp, sp, #4 /* align the stack */
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.cfi_adjust_cfa_offset 4
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mov r0, r2
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bl PIC_SYM(sigsetmask, PLT)
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add sp, sp, #4 /* unalign the stack */
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.cfi_adjust_cfa_offset -4
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ldmfd sp!, {r0, r1, r14}
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.cfi_def_cfa_offset 0
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#ifdef __ARM_HAVE_VFP
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/* Restore floating-point registers */
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add r2, r0, #(_JB_FLOAT_BASE * 4)
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vldmia r2, {d8-d15}
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/* Restore floating-point state */
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ldr r2, [r0, #(_JB_FLOAT_STATE * 4)]
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fmxr fpscr, r2
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#endif /* __ARM_HAVE_VFP */
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/* Restore core registers */
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add r2, r0, #(_JB_CORE_BASE * 4)
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ldmia r2, {r4-r14}
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/* Validate sp and r14 */
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teq sp, #0
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teqne r14, #0
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beq botch
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/* Set return value */
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mov r0, r1
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teq r0, #0x00000000
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moveq r0, #0x00000001
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bx lr
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#ifdef __ARM_26__
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mov r15, r14
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#else
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mov r15, r14
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#endif
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/* validation failed, die die die. */
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botch:
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bl PIC_SYM(longjmperror, PLT)
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bl PIC_SYM(abort, PLT)
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b . - 8 /* Cannot get here */
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END(longjmp)
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