1/* $NetBSD: compat_setjmp.S,v 1.5 2020/10/15 05:27:53 skrll 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 <sys/syscall.h> 36#include <mips/asm.h> 37 38#include "assym.h" 39 40#if defined(LIBC_SCCS) && !defined(lint) 41#if 0 42 RCSID("from: @(#)setjmp.s 8.1 (Berkeley) 6/4/93") 43#else 44 RCSID("$NetBSD: compat_setjmp.S,v 1.5 2020/10/15 05:27:53 skrll Exp $") 45#endif 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 (CALLFRAME_SIZ + STACK_T_SIZE) 60 61NON_LEAF(setjmp, SETJMP_FRAME_SIZE, ra) 62 .mask 0x80010000, (CALLFRAME_RA - CALLFRAME_SIZ) 63 SETUP_GP 64 PTR_SUBU sp, sp, SETJMP_FRAME_SIZE # allocate stack frame 65 SAVE_GP(CALLFRAME_GP) 66 SETUP_GP64(CALLFRAME_GP, setjmp) 67 68 REG_S ra, CALLFRAME_RA(sp) # save RA 69 REG_S s0, CALLFRAME_S0(sp) # save S0 70 move s0, a0 # save sigcontext 71 72 /* Get the signal mask. */ 73 move a0, zero # get current sigmask 74 jal _C_LABEL(sigblock) 75 nop 76 INT_S v0, _SC_MASK13(s0) # save sc_mask13 77 78 /* Get the signal stack. */ 79 move a0, zero 80 PTR_ADDU a1, sp, CALLFRAME_SIZ # pointer to stack_t 81 jal _C_LABEL(__sigaltstack14) 82 83 move a0, s0 # restore jmpbuf 84 INT_L v1, CALLFRAME_SIZ+_STACK_T_FLAGS(sp) 85 # get old ss_onstack 86 and v1, v1, SS_ONSTACK # extract onstack flag 87 INT_S v1, _SC_ONSTACK(a0) # save it in sc_onstack 88 89 REG_L s0, CALLFRAME_S0(sp) # restore S0 90 REG_L ra, CALLFRAME_RA(sp) # restore RA 91 blt v0, zero, botch # check for sigaltstack() error 92 nop 93 /* 94 * We know we won't need this routine's GP anymore. 95 */ 96 RESTORE_GP64 97 PTR_ADDU sp, sp, SETJMP_FRAME_SIZE # pop stack frame 98 99 REG_PROLOGUE 100 REG_S ra, _SC_PC(a0) # sc_pc = return address 101 REG_LI v0, 0xACEDBADE # sigcontext magic number 102 REG_S v0, _SC_REGS(a0) # saved in sc_regs[0] 103 REG_S s0, _SC_REGS_S0(a0) 104 REG_S s1, _SC_REGS_S1(a0) 105 REG_S s2, _SC_REGS_S2(a0) 106 REG_S s3, _SC_REGS_S3(a0) 107 REG_S s4, _SC_REGS_S4(a0) 108 REG_S s5, _SC_REGS_S5(a0) 109 REG_S s6, _SC_REGS_S6(a0) 110 REG_S s7, _SC_REGS_S7(a0) 111 REG_S gp, _SC_REGS_GP(a0) 112 REG_S sp, _SC_REGS_SP(a0) 113 REG_S s8, _SC_REGS_S8(a0) 114#ifdef SOFTFLOAT_FOR_GCC 115 INT_S zero, _SC_FPUSED(a0) # sc_fpused = 0 116#else 117 li v0, 1 # be nice if we could tell 118 INT_S v0, _SC_FPUSED(a0) # sc_fpused = 1 119 cfc1 v0, $31 120 INT_S v0, _SC_FPREGS_FCSR(a0) 121#if defined(__mips_o32) || defined(__mips_o64) || defined(__mips_n32) 122 FP_S $f20, _SC_FPREGS_F20(a0) 123 FP_S $f22, _SC_FPREGS_F22(a0) 124#endif 125#if defined(__mips_o32) || defined(__mips_o64) 126 FP_S $f21, _SC_FPREGS_F21(a0) 127 FP_S $f23, _SC_FPREGS_F23(a0) 128#endif 129#if defined(__mips_n32) || defined(__mips_n64) 130 FP_S $f24, _SC_FPREGS_F24(a0) 131 FP_S $f26, _SC_FPREGS_F26(a0) 132 FP_S $f28, _SC_FPREGS_F28(a0) 133 FP_S $f30, _SC_FPREGS_F30(a0) 134#endif 135#if defined(__mips_n64) 136 FP_S $f25, _SC_FPREGS_F25(a0) 137 FP_S $f27, _SC_FPREGS_F27(a0) 138 FP_S $f29, _SC_FPREGS_F29(a0) 139 FP_S $f31, _SC_FPREGS_F31(a0) 140#endif 141#endif /* SOFTFLOAT_FOR_GCC */ 142 REG_EPILOGUE 143 j ra 144 move v0, zero 145 146botch: 147 jal _C_LABEL(abort) 148END(setjmp) 149 150LEAF(longjmp) 151 SETUP_GP 152 PTR_SUBU sp, sp, CALLFRAME_SIZ 153 SAVE_GP(CALLFRAME_S0) 154 SETUP_GP64(s0, longjmp) 155 156 REG_PROLOGUE 157 /* save return value in sc_regs[_R_V0] */ 158 REG_S a1, _SC_REGS_V0(a0) 159 REG_EPILOGUE 160 161 li v0, SYS_compat_13_sigreturn13 162 syscall 163 164 jal _C_LABEL(longjmperror) 165 jal _C_LABEL(abort) 166END(longjmp) 167