/*      $NetBSD: _setjmp.S,v 1.27 2025/04/22 17:01:31 riastradh Exp $   */

/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/cdefs.h>
#include <mips/regnum.h>
#include <mips/asm.h>
#include <machine/setjmp.h>
#include <machine/signal.h>             /* XXX */

#include "assym.h"

#include "SYS.h"

#if defined(LIBC_SCCS) && !defined(lint)
#if 0
        RCSID("from: @(#)_setjmp.s      8.1 (Berkeley) 6/4/93")
#else
        RCSID("$NetBSD: _setjmp.S,v 1.27 2025/04/22 17:01:31 riastradh Exp $")
#endif
#endif /* LIBC_SCCS and not lint */

/*
 * C library -- _setjmp, _longjmp
 *
 *      _longjmp(a,v)
 * will generate a "return(v)" from
 * the last call to
 *      _setjmp(a)
 * by restoring registers from the stack,
 * The previous signal state is NOT restored.
 */

        .set    noreorder

LEAF(_setjmp)
        REG_PROLOGUE
        REG_LI  v0, 0xACEDBADE                  # sigcontext magic number
        REG_S   ra, _SC_PC(a0)                  # sc_pc = return address
        REG_S   v0, _SC_REGS(a0)                #   saved in sc_regs[0]
        REG_S   s0, _SC_REGS_S0(a0)
        REG_S   s1, _SC_REGS_S1(a0)
        REG_S   s2, _SC_REGS_S2(a0)
        REG_S   s3, _SC_REGS_S3(a0)
        REG_S   s4, _SC_REGS_S4(a0)
        REG_S   s5, _SC_REGS_S5(a0)
        REG_S   s6, _SC_REGS_S6(a0)
        REG_S   s7, _SC_REGS_S7(a0)
        REG_S   sp, _SC_REGS_SP(a0)
        REG_S   s8, _SC_REGS_S8(a0)
#if defined(__mips_n32) || defined(__mips_n64)
        REG_S   gp, _SC_REGS_GP(a0)             # newabi gp is callee-saved
#endif
        /*
         * In N32, FP registers F20, F22, F24, F26, F28, F30 are callee-saved.
         * In N64, FP registers F23 .. F31 are callee-saved.
         * In O32, FP registers F20 .. F23 are callee-saved.
         */
#ifndef SOFTFLOAT_FOR_GCC
        cfc1    v0, $31                         # too bad cant check if FP used
#if defined(__mips_n64) || defined(__mips_n32)
        FP_S    $f30, _SC_FPREGS_F30(a0)
        FP_S    $f28, _SC_FPREGS_F28(a0)
        FP_S    $f26, _SC_FPREGS_F26(a0)
        FP_S    $f24, _SC_FPREGS_F24(a0)
#endif
#if defined(__mips_n32) || defined(__mips_o32) || defined(__mips_o64)
        FP_S    $f22, _SC_FPREGS_F22(a0)
        FP_S    $f20, _SC_FPREGS_F20(a0)
#endif
#if defined(__mips_o32) || defined(__mips_o64)
        FP_S    $f21, _SC_FPREGS_F21(a0)
        FP_S    $f23, _SC_FPREGS_F23(a0)
#endif
#if defined(__mips_n64)
        FP_S    $f25, _SC_FPREGS_F25(a0)
        FP_S    $f27, _SC_FPREGS_F27(a0)
        FP_S    $f29, _SC_FPREGS_F29(a0)
        FP_S    $f31, _SC_FPREGS_F31(a0)
#endif
        INT_S   v0, _SC_FPREGS_FCSR(a0)
#endif  /* SOFTFLOAT_FOR_GCC */
        REG_EPILOGUE

        j       ra
         move   v0, zero
END(_setjmp)

LEAF(_longjmp)
        PIC_PROLOGUE(_longjmp)
        PTR_SUBU        sp, sp, CALLFRAME_SIZ
        SAVE_GP(CALLFRAME_GP)

        REG_PROLOGUE
        REG_L           v0, _SC_REGS(a0)        # get magic number
        REG_L           ra, _SC_PC(a0)
        REG_LI          t0, 0xACEDBADE
        bne             v0, t0, botch           # jump if error
        PTR_ADDU        sp, sp, CALLFRAME_SIZ   # does not matter, sanity
        beqz            a1, 2f                  # make sure val is nonzero
1:       REG_S          a1, _SC_REGS_V0(a0)     # save return value
        REG_L           s0, _SC_REGS_S0(a0)
        REG_L           s1, _SC_REGS_S1(a0)
        REG_L           s2, _SC_REGS_S2(a0)
        REG_L           s3, _SC_REGS_S3(a0)
        REG_L           s4, _SC_REGS_S4(a0)
        REG_L           s5, _SC_REGS_S5(a0)
        REG_L           s6, _SC_REGS_S6(a0)
        REG_L           s7, _SC_REGS_S7(a0)
#if defined(__mips_n32) || defined(__mips_n64)
        REG_L           gp, _SC_REGS_GP(a0)
#endif
#ifndef SOFTFLOAT_FOR_GCC
        # get fpu status
        INT_L           v0, _SC_FPREGS_FCSR(a0)
#endif
        REG_L           sp, _SC_REGS_SP(a0)
        REG_L           s8, _SC_REGS_S8(a0)
#ifndef SOFTFLOAT_FOR_GCC
        ctc1            v0, $31
        /*
         * In N32, FP registers F20, F22, F24, F26, F28, F30 are callee-saved.
         * In N64, FP registers F23 .. F31 are callee-saved.
         * In O32, FP registers F20 .. F23 are callee-saved.
         */
#if defined(__mips_n64) || defined(__mips_n32)
        FP_L    $f30, _SC_FPREGS_F30(a0)
        FP_L    $f28, _SC_FPREGS_F28(a0)
        FP_L    $f26, _SC_FPREGS_F26(a0)
        FP_L    $f24, _SC_FPREGS_F24(a0)
#endif
#if defined(__mips_n32) || defined(__mips_o32) || defined(__mips_o64)
        FP_L    $f22, _SC_FPREGS_F22(a0)
        FP_L    $f20, _SC_FPREGS_F20(a0)
#endif
#if defined(__mips_o32) || defined(__mips_o64)
        FP_L    $f21, _SC_FPREGS_F21(a0)
        FP_L    $f23, _SC_FPREGS_F23(a0)
#endif
#if defined(__mips_n64)
        FP_L    $f25, _SC_FPREGS_F25(a0)
        FP_L    $f27, _SC_FPREGS_F27(a0)
        FP_L    $f29, _SC_FPREGS_F29(a0)
        FP_L    $f31, _SC_FPREGS_F31(a0)
#endif
#endif  /* SOFTFLOAT_FOR_GCC */

        REG_EPILOGUE
        j       ra
         move   v0, a1                  # get return value in 1st arg

2:      b       1b                      # replace value 0 by value 1
         li     a1, 1

botch:
        /*
         * We know we aren't returning so we don't care about restoring
         * our caller's GP.
         */
        jal     _C_LABEL(longjmperror)
         nop

        PIC_TAILCALL(abort)
         nop
END(_longjmp)