setjmp.S revision 1.7
1 /* $NetBSD: setjmp.S,v 1.7 1997/12/05 02:10:47 thorpej 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 <mips/regnum.h> 41 #include <mips/asm.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 1.7 1997/12/05 02:10:47 thorpej Exp $") 46 #endif /* LIBC_SCCS and not lint */ 47 48 #ifdef ABICALLS 49 .abicalls 50 #endif 51 52 /* 53 * C library -- setjmp, longjmp 54 * 55 * longjmp(a,v) 56 * will generate a "return(v)" from 57 * the last call to 58 * setjmp(a) 59 * by restoring registers from the stack, 60 * and a struct sigcontext, see <signal.h> 61 */ 62 63 #define SETJMP_FRAME_SIZE (STAND_FRAME_SIZE + 12) 64 65 NON_LEAF(setjmp, SETJMP_FRAME_SIZE, ra) 66 .mask 0x80000000, (STAND_RA_OFFSET - STAND_FRAME_SIZE) 67 #ifdef ABICALLS 68 .set noreorder 69 .cpload t9 70 .set reorder 71 #endif 72 subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame 73 #ifdef ABICALLS 74 .cprestore 16 75 #endif 76 sw ra, STAND_RA_OFFSET(sp) # save state 77 sw a0, SETJMP_FRAME_SIZE(sp) 78 move a0, zero # get current signal mask 79 jal _C_LABEL(sigblock) 80 lw v1, SETJMP_FRAME_SIZE(sp) # v1 = jmpbuf 81 sw v0, (1 * 4)(v1) # save sc_mask = sigblock(0) 82 move a0, zero 83 addu a1, sp, STAND_FRAME_SIZE # pointer to struct sigaltstack 84 jal _C_LABEL(__sigaltstack14) 85 lw a0, SETJMP_FRAME_SIZE(sp) # restore jmpbuf 86 lw v1, STAND_FRAME_SIZE+8(sp) # get old ss_onstack 87 and v1, v1, 1 # extract onstack flag 88 sw v1, 0(a0) # save it in sc_onstack 89 lw ra, STAND_RA_OFFSET(sp) 90 addu sp, sp, SETJMP_FRAME_SIZE 91 blt v0, zero, botch # check for sigstack() error 92 sw ra, (2 * 4)(a0) # sc_pc = return address 93 li v0, 0xACEDBADE # sigcontext magic number 94 sw v0, ((ZERO + 3) * 4)(a0) # saved in sc_regs[0] 95 sw s0, ((S0 + 3) * 4)(a0) 96 sw s1, ((S1 + 3) * 4)(a0) 97 sw s2, ((S2 + 3) * 4)(a0) 98 sw s3, ((S3 + 3) * 4)(a0) 99 sw s4, ((S4 + 3) * 4)(a0) 100 sw s5, ((S5 + 3) * 4)(a0) 101 sw s6, ((S6 + 3) * 4)(a0) 102 sw s7, ((S7 + 3) * 4)(a0) 103 sw gp, ((GP + 3) * 4)(a0) 104 sw sp, ((SP + 3) * 4)(a0) 105 sw s8, ((S8 + 3) * 4)(a0) 106 li v0, 1 # be nice if we could tell 107 sw v0, (37 * 4)(a0) # sc_fpused = 1 108 cfc1 v0, $31 109 swc1 $f20, ((20 + 38) * 4)(a0) 110 swc1 $f21, ((21 + 38) * 4)(a0) 111 swc1 $f22, ((22 + 38) * 4)(a0) 112 swc1 $f23, ((23 + 38) * 4)(a0) 113 swc1 $f24, ((24 + 38) * 4)(a0) 114 swc1 $f25, ((25 + 38) * 4)(a0) 115 swc1 $f26, ((26 + 38) * 4)(a0) 116 swc1 $f27, ((27 + 38) * 4)(a0) 117 swc1 $f28, ((28 + 38) * 4)(a0) 118 swc1 $f29, ((29 + 38) * 4)(a0) 119 swc1 $f30, ((30 + 38) * 4)(a0) 120 swc1 $f31, ((31 + 38) * 4)(a0) 121 sw v0, ((32 + 38) * 4)(a0) 122 move v0, zero 123 j ra 124 END(setjmp) 125 126 LEAF(longjmp) 127 #ifdef ABICALLS 128 .set noreorder 129 .cpload t9 130 .set reorder 131 subu sp, sp, 32 132 .cprestore 16 133 #endif 134 sw a1, ((V0 + 3) * 4)(a0) # save return value in sc_regs[V0] 135 li v0, SYS_sigreturn 136 syscall 137 botch: 138 jal _C_LABEL(longjmperror) 139 jal _C_LABEL(abort) 140 END(longjmp) 141
Indexes created Tue Sep 30 20:09:53 GMT 2025