setjmp.S revision 1.15
1 /* $NetBSD: setjmp.S,v 1.15 2003/08/07 16:42:15 agc 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 1.15 2003/08/07 16:42:15 agc 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(setjmp, 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 state 76 sw a0, SETJMP_FRAME_SIZE(sp) 77 move a0, zero # get current signal mask 78 jal _C_LABEL(sigblock) 79 lw v1, SETJMP_FRAME_SIZE(sp) # v1 = jmpbuf 80 sw v0, (1 * 4)(v1) # save sc_mask = sigblock(0) 81 move a0, zero 82 addu a1, sp, CALLFRAME_SIZ # pointer to struct sigaltstack 83 jal _C_LABEL(__sigaltstack14) 84 lw a0, SETJMP_FRAME_SIZE(sp) # restore jmpbuf 85 lw v1, CALLFRAME_SIZ+8(sp) # get old ss_onstack 86 and v1, v1, 1 # extract onstack flag 87 sw v1, 0(a0) # save it in sc_onstack 88 lw ra, CALLFRAME_RA(sp) 89 addu sp, sp, SETJMP_FRAME_SIZE 90 blt v0, zero, botch # check for sigstack() error 91 REG_PROLOGUE 92 REG_S ra, (2 * 4)(a0) # sc_pc = return address 93 REG_LI v0, 0xACEDBADE # sigcontext magic number 94 REG_S v0, (_OFFSETOF_SC_REGS + SZREG * ZERO)(a0) # saved in sc_regs[0] 95 REG_S s0, (_OFFSETOF_SC_REGS + SZREG * S0)(a0) 96 REG_S s1, (_OFFSETOF_SC_REGS + SZREG * S1)(a0) 97 REG_S s2, (_OFFSETOF_SC_REGS + SZREG * S2)(a0) 98 REG_S s3, (_OFFSETOF_SC_REGS + SZREG * S3)(a0) 99 REG_S s4, (_OFFSETOF_SC_REGS + SZREG * S4)(a0) 100 REG_S s5, (_OFFSETOF_SC_REGS + SZREG * S5)(a0) 101 REG_S s6, (_OFFSETOF_SC_REGS + SZREG * S6)(a0) 102 REG_S s7, (_OFFSETOF_SC_REGS + SZREG * S7)(a0) 103 REG_S gp, (_OFFSETOF_SC_REGS + SZREG * GP)(a0) 104 REG_S sp, (_OFFSETOF_SC_REGS + SZREG * SP)(a0) 105 REG_S s8, (_OFFSETOF_SC_REGS + SZREG * S8)(a0) 106 li v0, 1 # be nice if we could tell 107 sw v0, (_OFFSETOF_SC_REGS + 34 * SZREG)(a0) # sc_fpused = 1 108 cfc1 v0, $31 109 swc1 $f20, (20 * 4 + _OFFSETOF_SC_FPREGS)(a0) 110 swc1 $f21, (21 * 4 + _OFFSETOF_SC_FPREGS)(a0) 111 swc1 $f22, (22 * 4 + _OFFSETOF_SC_FPREGS)(a0) 112 swc1 $f23, (23 * 4 + _OFFSETOF_SC_FPREGS)(a0) 113 swc1 $f24, (24 * 4 + _OFFSETOF_SC_FPREGS)(a0) 114 swc1 $f25, (25 * 4 + _OFFSETOF_SC_FPREGS)(a0) 115 swc1 $f26, (26 * 4 + _OFFSETOF_SC_FPREGS)(a0) 116 swc1 $f27, (27 * 4 + _OFFSETOF_SC_FPREGS)(a0) 117 swc1 $f28, (28 * 4 + _OFFSETOF_SC_FPREGS)(a0) 118 swc1 $f29, (29 * 4 + _OFFSETOF_SC_FPREGS)(a0) 119 swc1 $f30, (30 * 4 + _OFFSETOF_SC_FPREGS)(a0) 120 swc1 $f31, (31 * 4 + _OFFSETOF_SC_FPREGS)(a0) 121 sw v0, ((32 * 4) + _OFFSETOF_SC_FPREGS)(a0) 122 REG_EPILOGUE 123 move v0, zero 124 j ra 125 END(setjmp) 126 127 LEAF(longjmp) 128 #ifdef __ABICALLS__ 129 .set noreorder 130 .cpload t9 131 .set reorder 132 subu sp, sp, 32 133 .cprestore 16 134 #endif 135 REG_PROLOGUE 136 /* save return value in sc_regs[V0] */ 137 REG_S a1, (_OFFSETOF_SC_REGS + V0 * SZREG)(a0) 138 REG_EPILOGUE 139 li v0, SYS_compat_13_sigreturn13 140 syscall 141 botch: 142 jal _C_LABEL(longjmperror) 143 jal _C_LABEL(abort) 144 END(longjmp) 145
Indexes created Tue Sep 30 20:09:53 GMT 2025