/* $NetBSD: setjmp.S,v 1.17.26.1 2024/08/23 16:59:52 martin Exp $ */ /*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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. 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 REGENTS 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 REGENTS 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. * * from: @(#)setjmp.s 5.1 (Berkeley) 4/23/90 */ #include #if defined(LIBC_SCCS) RCSID("$NetBSD: setjmp.S,v 1.17.26.1 2024/08/23 16:59:52 martin Exp $") #endif /* * 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. */ /* * setjmp(jmp_buf env@esp[4,8)) * * ELF symbol: __setjmp14, because the size of jmp_buf changed on some * platforms in 1.4. */ ENTRY(__setjmp14) /* * Save the callee-saves registers: %ebp, %ebx, %edi, %esi, * plus %esp and the return address on the stack since it * will be overwritten if the caller makes any subroutine * calls before longjmp. */ movl 4(%esp),%ecx /* ecx := env */ movl 0(%esp),%edx /* edx := return address */ movl %edx,0(%ecx) movl %ebx,4(%ecx) movl %esp,8(%ecx) movl %ebp,12(%ecx) movl %esi,16(%ecx) movl %edi,20(%ecx) /* Get the signal mask. */ leal 24(%ecx),%edx PIC_PROLOGUE pushl %edx /* oset (signal mask saved to) */ pushl $0 /* set := NULL */ pushl $0 /* how := 0 (ignored) */ #ifdef __PIC__ call PIC_PLT(_C_LABEL(__sigprocmask14)) #else call _C_LABEL(__sigprocmask14) #endif addl $12,%esp /* pop sigprocmask args */ PIC_EPILOGUE xorl %eax,%eax /* return 0 first time around */ ret END(__setjmp14) /* * longjmp(jmp_buf env@esp[4,8), int val@[8,12)) * * ELF symbol: __longjmp14, because the size of jmp_buf changed on some * platforms in 1.4. */ ENTRY(__longjmp14) /* * Restore the callee-saves registers: %ebp, %ebx, %edi, %esi, * plus %esp and the return address on the stack. */ movl 4(%esp),%edx /* edx := env */ movl 8(%esp),%eax /* eax := val */ movl 0(%edx),%ecx /* ecx := return address */ movl 4(%edx),%ebx movl 8(%edx),%esp movl 12(%edx),%ebp movl 16(%edx),%esi movl 20(%edx),%edi movl %ecx,0(%esp) /* restore return address */ /* Restore the signal mask. */ leal 24(%edx),%edx pushl %eax /* save val@eax */ PIC_PROLOGUE pushl $0 /* oset := NULL */ pushl %edx /* set (signal mask restored from) */ pushl $3 /* how := SIG_SETMASK */ #ifdef __PIC__ call PIC_PLT(_C_LABEL(__sigprocmask14)) #else call _C_LABEL(__sigprocmask14) #endif addl $12,%esp /* pop sigprocmask args */ PIC_EPILOGUE popl %eax /* restore val@eax */ testl %eax,%eax /* val == 0? */ jz 3f /* jump if val == 0 */ ret /* return val@eax */ 3: incl %eax /* val@eax := 1 */ ret /* return val@eax */ END(__longjmp14)