setjmp.S revision 1.2
1 1.1 glass /*- 2 1.1 glass * Copyright (c) 1991, 1993 3 1.1 glass * The Regents of the University of California. All rights reserved. 4 1.1 glass * 5 1.1 glass * This code is derived from software contributed to Berkeley by 6 1.1 glass * Ralph Campbell. 7 1.1 glass * 8 1.1 glass * Redistribution and use in source and binary forms, with or without 9 1.1 glass * modification, are permitted provided that the following conditions 10 1.1 glass * are met: 11 1.1 glass * 1. Redistributions of source code must retain the above copyright 12 1.1 glass * notice, this list of conditions and the following disclaimer. 13 1.1 glass * 2. Redistributions in binary form must reproduce the above copyright 14 1.1 glass * notice, this list of conditions and the following disclaimer in the 15 1.1 glass * documentation and/or other materials provided with the distribution. 16 1.1 glass * 3. All advertising materials mentioning features or use of this software 17 1.1 glass * must display the following acknowledgement: 18 1.1 glass * This product includes software developed by the University of 19 1.1 glass * California, Berkeley and its contributors. 20 1.1 glass * 4. Neither the name of the University nor the names of its contributors 21 1.1 glass * may be used to endorse or promote products derived from this software 22 1.1 glass * without specific prior written permission. 23 1.1 glass * 24 1.1 glass * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 1.1 glass * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 1.1 glass * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 1.1 glass * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 1.1 glass * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 1.1 glass * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 1.1 glass * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 1.1 glass * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 1.1 glass * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 1.1 glass * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 1.1 glass * SUCH DAMAGE. 35 1.1 glass */ 36 1.1 glass 37 1.1 glass #include <sys/syscall.h> 38 1.1 glass #include <machine/reg.h> 39 1.1 glass #include <machine/machAsmDefs.h> 40 1.1 glass 41 1.1 glass #if defined(LIBC_SCCS) && !defined(lint) 42 1.1 glass ASMSTR("from: @(#)setjmp.s 8.1 (Berkeley) 6/4/93") 43 1.2 dean ASMSTR("$Id: setjmp.S,v 1.2 1994/11/14 23:34:42 dean Exp $") 44 1.1 glass #endif /* LIBC_SCCS and not lint */ 45 1.1 glass 46 1.1 glass /* 47 1.1 glass * C library -- setjmp, longjmp 48 1.1 glass * 49 1.1 glass * longjmp(a,v) 50 1.1 glass * will generate a "return(v)" from 51 1.1 glass * the last call to 52 1.1 glass * setjmp(a) 53 1.1 glass * by restoring registers from the stack, 54 1.1 glass * and a struct sigcontext, see <signal.h> 55 1.1 glass */ 56 1.1 glass 57 1.1 glass #define SETJMP_FRAME_SIZE (STAND_FRAME_SIZE + 12) 58 1.1 glass 59 1.2 dean NON_LEAF(_setjmp, SETJMP_FRAME_SIZE, ra) 60 1.1 glass subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame 61 1.1 glass .mask 0x80000000, (STAND_RA_OFFSET - STAND_FRAME_SIZE) 62 1.1 glass sw ra, STAND_RA_OFFSET(sp) # save state 63 1.1 glass sw a0, SETJMP_FRAME_SIZE(sp) 64 1.1 glass move a0, zero # get current signal mask 65 1.2 dean jal _sigblock 66 1.1 glass lw v1, SETJMP_FRAME_SIZE(sp) # v1 = jmpbuf 67 1.1 glass sw v0, (1 * 4)(v1) # save sc_mask = sigblock(0) 68 1.1 glass move a0, zero 69 1.1 glass addu a1, sp, STAND_FRAME_SIZE # pointer to struct sigaltstack 70 1.2 dean jal _sigaltstack 71 1.1 glass lw a0, SETJMP_FRAME_SIZE(sp) # restore jmpbuf 72 1.1 glass lw v1, STAND_FRAME_SIZE+8(sp) # get old ss_onstack 73 1.1 glass and v1, v1, 1 # extract onstack flag 74 1.1 glass sw v1, 0(a0) # save it in sc_onstack 75 1.1 glass lw ra, STAND_RA_OFFSET(sp) 76 1.1 glass addu sp, sp, SETJMP_FRAME_SIZE 77 1.1 glass blt v0, zero, botch # check for sigstack() error 78 1.1 glass sw ra, (2 * 4)(a0) # sc_pc = return address 79 1.1 glass li v0, 0xACEDBADE # sigcontext magic number 80 1.1 glass sw v0, ((ZERO + 3) * 4)(a0) # saved in sc_regs[0] 81 1.1 glass sw s0, ((S0 + 3) * 4)(a0) 82 1.1 glass sw s1, ((S1 + 3) * 4)(a0) 83 1.1 glass sw s2, ((S2 + 3) * 4)(a0) 84 1.1 glass sw s3, ((S3 + 3) * 4)(a0) 85 1.1 glass sw s4, ((S4 + 3) * 4)(a0) 86 1.1 glass sw s5, ((S5 + 3) * 4)(a0) 87 1.1 glass sw s6, ((S6 + 3) * 4)(a0) 88 1.1 glass sw s7, ((S7 + 3) * 4)(a0) 89 1.1 glass sw gp, ((GP + 3) * 4)(a0) 90 1.1 glass sw sp, ((SP + 3) * 4)(a0) 91 1.1 glass sw s8, ((S8 + 3) * 4)(a0) 92 1.1 glass li v0, 1 # be nice if we could tell 93 1.1 glass sw v0, (37 * 4)(a0) # sc_fpused = 1 94 1.1 glass cfc1 v0, $31 95 1.1 glass swc1 $f20, ((20 + 38) * 4)(a0) 96 1.1 glass swc1 $f21, ((21 + 38) * 4)(a0) 97 1.1 glass swc1 $f22, ((22 + 38) * 4)(a0) 98 1.1 glass swc1 $f23, ((23 + 38) * 4)(a0) 99 1.1 glass swc1 $f24, ((24 + 38) * 4)(a0) 100 1.1 glass swc1 $f25, ((25 + 38) * 4)(a0) 101 1.1 glass swc1 $f26, ((26 + 38) * 4)(a0) 102 1.1 glass swc1 $f27, ((27 + 38) * 4)(a0) 103 1.1 glass swc1 $f28, ((28 + 38) * 4)(a0) 104 1.1 glass swc1 $f29, ((29 + 38) * 4)(a0) 105 1.1 glass swc1 $f30, ((30 + 38) * 4)(a0) 106 1.1 glass swc1 $f31, ((31 + 38) * 4)(a0) 107 1.1 glass sw v0, ((32 + 38) * 4)(a0) 108 1.1 glass move v0, zero 109 1.1 glass j ra 110 1.2 dean END(_setjmp) 111 1.1 glass 112 1.2 dean LEAF(_longjmp) 113 1.1 glass sw a1, ((V0 + 3) * 4)(a0) # save return value in sc_regs[V0] 114 1.1 glass li v0, SYS_sigreturn 115 1.1 glass syscall 116 1.1 glass botch: 117 1.2 dean jal _longjmperror 118 1.2 dean jal _abort 119 1.2 dean END(_longjmp) 120
Indexes created Wed Oct 01 07:09:59 GMT 2025