setjmp.S revision 1.5
1 /* $NetBSD: setjmp.S,v 1.5 1996/09/16 18:11:01 jonathan Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/syscall.h> 40 #include <machine/regnum.h> 41 #include <machine/machAsmDefs.h> 42 43 #if defined(LIBC_SCCS) && !defined(lint) 44 ASMSTR("from: @(#)setjmp.s 8.1 (Berkeley) 6/4/93") 45 ASMSTR("$NetBSD: setjmp.S,v 1.5 1996/09/16 18:11:01 jonathan Exp $") 46 #endif /* LIBC_SCCS and not lint */ 47 48 /* 49 * C library -- setjmp, longjmp 50 * 51 * longjmp(a,v) 52 * will generate a "return(v)" from 53 * the last call to 54 * setjmp(a) 55 * by restoring registers from the stack, 56 * and a struct sigcontext, see <signal.h> 57 */ 58 59 #define SETJMP_FRAME_SIZE (STAND_FRAME_SIZE + 12) 60 61 NON_LEAF(setjmp, SETJMP_FRAME_SIZE, ra) 62 subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame 63 .mask 0x80000000, (STAND_RA_OFFSET - STAND_FRAME_SIZE) 64 sw ra, STAND_RA_OFFSET(sp) # save state 65 sw a0, SETJMP_FRAME_SIZE(sp) 66 move a0, zero # get current signal mask 67 jal _C_LABEL(sigblock) 68 lw v1, SETJMP_FRAME_SIZE(sp) # v1 = jmpbuf 69 sw v0, (1 * 4)(v1) # save sc_mask = sigblock(0) 70 move a0, zero 71 addu a1, sp, STAND_FRAME_SIZE # pointer to struct sigaltstack 72 jal _C_LABEL(sigaltstack) 73 lw a0, SETJMP_FRAME_SIZE(sp) # restore jmpbuf 74 lw v1, STAND_FRAME_SIZE+8(sp) # get old ss_onstack 75 and v1, v1, 1 # extract onstack flag 76 sw v1, 0(a0) # save it in sc_onstack 77 lw ra, STAND_RA_OFFSET(sp) 78 addu sp, sp, SETJMP_FRAME_SIZE 79 blt v0, zero, botch # check for sigstack() error 80 sw ra, (2 * 4)(a0) # sc_pc = return address 81 li v0, 0xACEDBADE # sigcontext magic number 82 sw v0, ((ZERO + 3) * 4)(a0) # saved in sc_regs[0] 83 sw s0, ((S0 + 3) * 4)(a0) 84 sw s1, ((S1 + 3) * 4)(a0) 85 sw s2, ((S2 + 3) * 4)(a0) 86 sw s3, ((S3 + 3) * 4)(a0) 87 sw s4, ((S4 + 3) * 4)(a0) 88 sw s5, ((S5 + 3) * 4)(a0) 89 sw s6, ((S6 + 3) * 4)(a0) 90 sw s7, ((S7 + 3) * 4)(a0) 91 sw gp, ((GP + 3) * 4)(a0) 92 sw sp, ((SP + 3) * 4)(a0) 93 sw s8, ((S8 + 3) * 4)(a0) 94 li v0, 1 # be nice if we could tell 95 sw v0, (37 * 4)(a0) # sc_fpused = 1 96 cfc1 v0, $31 97 swc1 $f20, ((20 + 38) * 4)(a0) 98 swc1 $f21, ((21 + 38) * 4)(a0) 99 swc1 $f22, ((22 + 38) * 4)(a0) 100 swc1 $f23, ((23 + 38) * 4)(a0) 101 swc1 $f24, ((24 + 38) * 4)(a0) 102 swc1 $f25, ((25 + 38) * 4)(a0) 103 swc1 $f26, ((26 + 38) * 4)(a0) 104 swc1 $f27, ((27 + 38) * 4)(a0) 105 swc1 $f28, ((28 + 38) * 4)(a0) 106 swc1 $f29, ((29 + 38) * 4)(a0) 107 swc1 $f30, ((30 + 38) * 4)(a0) 108 swc1 $f31, ((31 + 38) * 4)(a0) 109 sw v0, ((32 + 38) * 4)(a0) 110 move v0, zero 111 j ra 112 END(setjmp) 113 114 LEAF(longjmp) 115 sw a1, ((V0 + 3) * 4)(a0) # save return value in sc_regs[V0] 116 li v0, SYS_sigreturn 117 syscall 118 botch: 119 jal _C_LABEL(longjmperror) 120 jal _C_LABEL(abort) 121 END(longjmp) 122
Indexes created Tue Sep 30 20:09:53 GMT 2025