setjmp.S revision 1.17
1 /* $NetBSD: setjmp.S,v 1.17 2005/09/17 11:49:39 tsutsui 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <machine/cdefs.h> 36 #include <sys/syscall.h> 37 #include <mips/regnum.h> 38 #include <mips/asm.h> 39 #include <machine/signal.h> 40 #include <machine/setjmp.h> 41 42 #if defined(LIBC_SCCS) && !defined(lint) 43 ASMSTR("from: @(#)setjmp.s 8.1 (Berkeley) 6/4/93") 44 ASMSTR("$NetBSD: setjmp.S,v 1.17 2005/09/17 11:49:39 tsutsui Exp $") 45 #endif /* LIBC_SCCS and not lint */ 46 47 #ifdef __ABICALLS__ 48 .abicalls 49 #endif 50 51 /* 52 * C library -- setjmp, longjmp 53 * 54 * longjmp(a,v) 55 * will generate a "return(v)" from 56 * the last call to 57 * setjmp(a) 58 * by restoring registers from the stack, 59 * and a struct sigcontext, see <signal.h> 60 */ 61 62 #define SETJMP_FRAME_SIZE (CALLFRAME_SIZ + 12) 63 64 NON_LEAF(__setjmp14, SETJMP_FRAME_SIZE, ra) 65 .mask 0x80000000, (CALLFRAME_RA - CALLFRAME_SIZ) 66 #ifdef __ABICALLS__ 67 .set noreorder 68 .cpload t9 69 .set reorder 70 #endif 71 subu sp, sp, SETJMP_FRAME_SIZE # allocate stack frame 72 #ifdef __ABICALLS__ 73 .cprestore 16 74 #endif 75 sw ra, CALLFRAME_RA(sp) # save RA 76 sw a0, SETJMP_FRAME_SIZE(sp) # squirrel away sc 77 78 /* Get the signal mask. */ 79 addu a2, a0, _OFFSETOF_SC_MASK # &sc.sc_mask 80 move a1, zero 81 jal _C_LABEL(__sigprocmask14) # get current signal mask 82 move a0, zero # (in delay slot) 83 84 /* Get the signal stack. */ 85 move a0, zero 86 addu a1, sp, CALLFRAME_SIZ # pointer to struct sigaltstack 87 jal _C_LABEL(__sigaltstack14) 88 nop 89 lw v1, CALLFRAME_SIZ+8(sp) # get old ss_onstack 90 lw a0, SETJMP_FRAME_SIZE(sp) # restore sc pointer 91 and v1, v1, 1 # extract onstack flag 92 sw v1, 0(a0) # save it in sc_onstack 93 94 lw ra, CALLFRAME_RA(sp) # restore RA 95 addu sp, sp, SETJMP_FRAME_SIZE # pop stack frame 96 97 blt v0, zero, botch # check for sigaltstack() error 98 99 REG_PROLOGUE 100 REG_S ra, (2 * 4)(a0) # sc_pc = return address 101 REG_LI v0, 0xACEDBADE # sigcontext magic number 102 REG_S v0, (_OFFSETOF_SC_REGS + _R_ZERO * SZREG)(a0) # saved in sc_regs[0] 103 REG_S s0, (_OFFSETOF_SC_REGS + _R_S0 * SZREG)(a0) 104 REG_S s1, (_OFFSETOF_SC_REGS + _R_S1 * SZREG)(a0) 105 REG_S s2, (_OFFSETOF_SC_REGS + _R_S2 * SZREG)(a0) 106 REG_S s3, (_OFFSETOF_SC_REGS + _R_S3 * SZREG)(a0) 107 REG_S s4, (_OFFSETOF_SC_REGS + _R_S4 * SZREG)(a0) 108 REG_S s5, (_OFFSETOF_SC_REGS + _R_S5 * SZREG)(a0) 109 REG_S s6, (_OFFSETOF_SC_REGS + _R_S6 * SZREG)(a0) 110 REG_S s7, (_OFFSETOF_SC_REGS + _R_S7 * SZREG)(a0) 111 REG_S gp, (_OFFSETOF_SC_REGS + _R_GP * SZREG)(a0) 112 REG_S sp, (_OFFSETOF_SC_REGS + _R_SP * SZREG)(a0) 113 REG_S s8, (_OFFSETOF_SC_REGS + _R_S8 * SZREG)(a0) 114 li v0, 1 # be nice if we could tell 115 sw v0, (_OFFSETOF_SC_REGS + 34 * SZREG)(a0) # sc_fpused = 1 116 cfc1 v0, $31 117 swc1 $f20, (20 * 4 + _OFFSETOF_SC_FPREGS)(a0) 118 swc1 $f21, (21 * 4 + _OFFSETOF_SC_FPREGS)(a0) 119 swc1 $f22, (22 * 4 + _OFFSETOF_SC_FPREGS)(a0) 120 swc1 $f23, (23 * 4 + _OFFSETOF_SC_FPREGS)(a0) 121 swc1 $f24, (24 * 4 + _OFFSETOF_SC_FPREGS)(a0) 122 swc1 $f25, (25 * 4 + _OFFSETOF_SC_FPREGS)(a0) 123 swc1 $f26, (26 * 4 + _OFFSETOF_SC_FPREGS)(a0) 124 swc1 $f27, (27 * 4 + _OFFSETOF_SC_FPREGS)(a0) 125 swc1 $f28, (28 * 4 + _OFFSETOF_SC_FPREGS)(a0) 126 swc1 $f29, (29 * 4 + _OFFSETOF_SC_FPREGS)(a0) 127 swc1 $f30, (30 * 4 + _OFFSETOF_SC_FPREGS)(a0) 128 swc1 $f31, (31 * 4 + _OFFSETOF_SC_FPREGS)(a0) 129 sw v0, (32 * 4 + _OFFSETOF_SC_FPREGS)(a0) 130 move v0, zero 131 j ra 132 REG_EPILOGUE 133 botch: 134 jal _C_LABEL(abort) 135 END(__setjmp14) 136
Indexes created Tue Sep 30 20:09:53 GMT 2025