1/* $NetBSD: __sigsetjmp14.S,v 1.4 2024/04/04 00:46:30 riastradh Exp $ */ 2 3/* 4 * Copyright (c) 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 39#include <machine/asm.h> 40#include <machine/setjmp.h> 41 42#if defined(LIBC_SCCS) 43 RCSID("$NetBSD: __sigsetjmp14.S,v 1.4 2024/04/04 00:46:30 riastradh Exp $") 44#endif 45 46/* 47 * C library -- _setjmp, _longjmp 48 * 49 * longjmp(a,v) 50 * will generate a "return(v)" from the last call to 51 * setjmp(a) 52 * by restoring registers from the stack. 53 * The previous signal state is restored. 54 */ 55 56/* 57 * sigsetjmp(sigjmp_buf env@rdi, int savemask@esi) 58 * 59 * ELF symbol: __sigsetjmp14, because the size of sigjmp_buf changed on 60 * some platforms in 1.4. 61 */ 62ENTRY(__sigsetjmp14) 63 /* 64 * Save the callee-saves registers: %rbx, %rbp, %r12-r15, 65 * plus %rsp and the return address on the stack since it 66 * will be overwritten if the caller makes any subroutine 67 * calls before siglongjmp. 68 */ 69 movq (%rsp),%r11 70 movq %rbx,(_JB_RBX * 8)(%rdi) 71 movq %rbp,(_JB_RBP * 8)(%rdi) 72 movq %r12,(_JB_R12 * 8)(%rdi) 73 movq %r13,(_JB_R13 * 8)(%rdi) 74 movq %r14,(_JB_R14 * 8)(%rdi) 75 movq %r15,(_JB_R15 * 8)(%rdi) 76 movq %rsp,(_JB_RSP * 8)(%rdi) 77 movq %r11,(_JB_PC * 8)(%rdi) 78 79 movq %rsi,(_JB_SIGFLAG * 8)(%rdi) /* store savemask */ 80 testl %esi,%esi /* savemask == 0? */ 81 jz 2f /* jump if savemask == 0 */ 82 83 leaq (_JB_SIGMASK * 8)(%rdi),%rdx /* oset@rdx */ 84 xorl %edi,%edi /* how@edi := 0 (ignored) */ 85 xorl %esi,%esi /* set@rsi := NULL */ 86 87#ifdef __PIC__ 88 call PIC_PLT(_C_LABEL(__sigprocmask14)) 89#else 90 call _C_LABEL(__sigprocmask14) 91#endif 922: xorl %eax,%eax /* return 0 first time around */ 93 ret 94END(__sigsetjmp14) 95 96/* 97 * siglongjmp(sigjmp_buf env@rdi, int val@esi) 98 * 99 * ELF symbol: __siglongjmp14, because the size of sigjmp_buf changed 100 * on some platforms in 1.4. 101 */ 102ENTRY(__siglongjmp14) 103 /* 104 * Restore the callee-saves registers: %rbx, %rbp, %r12-r15, 105 * plus %rsp and the return address on the stack. 106 */ 107 movq (_JB_RBX * 8)(%rdi),%rbx 108 movq (_JB_RBP * 8)(%rdi),%rbp 109 movq (_JB_R12 * 8)(%rdi),%r12 110 movq (_JB_R13 * 8)(%rdi),%r13 111 movq (_JB_R14 * 8)(%rdi),%r14 112 movq (_JB_R15 * 8)(%rdi),%r15 113 movq (_JB_RSP * 8)(%rdi),%rsp 114 movq (_JB_PC * 8)(%rdi),%r11 115 movq %r11,0(%rsp) 116 117 /* 118 * Use pushq %rsi instead of pushl %esi in order to keep 119 * 16-byte stack alignment, even though we only care about the 120 * 32-bit int in esi. 121 */ 122 pushq %rsi /* save val@esi */ 123 124 cmpl $0, (_JB_SIGFLAG * 8)(%rdi) /* test savemask == 0? */ 125 jz 2f /* jump if savemask == 0 */ 126 127 leaq (_JB_SIGMASK * 8)(%rdi),%rsi /* set@rsi */ 128 movl $3,%edi /* how@edi := SIG_SETMASK */ 129 xorl %edx,%edx /* oset@rdx := NULL */ 130 131#ifdef __PIC__ 132 call PIC_PLT(_C_LABEL(__sigprocmask14)) 133#else 134 call _C_LABEL(__sigprocmask14) 135#endif 136 1372: popq %rax /* restore val@eax */ 138 139 testl %eax,%eax /* val@eax == 0? */ 140 jz 1f /* jump if val@eax == 0 */ 141 ret /* return val@eax */ 1421: incl %eax /* val@eax := 1 */ 143 ret /* return val@eax */ 144END(__siglongjmp14) 145