/*      $NetBSD: compat_setjmp.S,v 1.7 2026/03/23 19:50:57 skrll Exp $  */

/*
 * Copyright (c) 1997 Mark Brinicombe
 * All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Mark Brinicombe
 * 4. 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 AUTHOR 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 AUTHOR 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/asm.h>
#include <machine/setjmp.h>

/*
 * 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 restored.
 */

ENTRY(setjmp)
        /* Retrieve the old signal mask */
        push    {r0, lr}
        movs    r0, #0x00000000

        bl      PLT_SYM(_C_LABEL(sigblock))
        mov     r1, r0
        pop     {r0, lr}

        /* Store signal mask */
        str     r1, [r0, #(_JB_SIGMASK * 4)]

        ldr     r1, .Lsetjmp_magic
        str     r1, [r0]

        /* Store integer registers */
        adds    r0, r0, #(_JB_REG_R4 * 4)
#ifdef __thumb__
#ifdef _ARM_ARCH_7
        stmia   r0!, {r4-r12}
        str     sp, [r0, #0]
        str     lr, [r0, #4]
#else
        stmia   r0!, {r4-r7}
        mov     r2, r8
        mov     r3, r9
        stmia   r0!, {r2-r3}
        mov     r1, r10
        mov     r2, r11
        mov     r3, r12
        stmia   r0!, {r1-r3}
        mov     r2, sp
        mov     r3, lr
        stmia   r0!, {r2-r3}
#endif
#else
        stmia   r0, {r4-lr}
#endif
        movs    r0, #0
        RET
END(setjmp)

ENTRY(longjmp)
        ldr     r2, .Lsetjmp_magic
        ldr     r3, [r0]
        cmp     r2, r3
        bne     botch

        /* Validate sp and lr */
        ldr     r2, [r0, #(_JB_REG_R13 * 4)]

        /* Validate sp */
        cmp     r2, #0
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
        cbz     r2, botch
#else
        cmp     r2, #0
        beq     botch
#endif

        ldr     r3, [r0, #(_JB_REG_R14 * 4)]
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
        cbz     r3, botch
#else
        cmp     r3, #0
        beq     botch
#endif

        cmp     r3, #0

        mov     sp, r2
        mov     lr, r3

        /* Fetch signal mask */
        ldr     r2, [r0, #(_JB_SIGMASK * 4)]

        /* Set signal mask */
        push    {r0-r2, lr}

        mov     r0, r2
        bl      PLT_SYM(_C_LABEL(sigsetmask))

        pop     {r0-r2, lr}

        /* Restore integer registers */
        adds    r0, r0, #(_JB_REG_R4 * 4)
#if !defined(__thumb__) || defined(_ARM_ARCH_7)
        ldmia   r0!, {r4-r12}
#else
        ldmia   r0!, {r4-r7}
        ldmia   r0!, {r2-r3}
        mov     r8, r2
        mov     r9, r3
        ldmia   r0!, {r1-r3}
        mov     r10, r2
        mov     r11, r3
        ldmia   r0!, {r2}
        mov     r12, r2
#endif

        /* Set return value */
        mov     r0, r1
        cmp     r0, #0
#ifdef __thumb__
        bne     1f
        movs    r0, #1
1:
#else
        moveq   r0, #1
#endif
        RET

        /* validation failed, die die die. */
botch:
        bl      PLT_SYM(_C_LABEL(longjmperror))
        bl      PLT_SYM(_C_LABEL(abort))
2:      b       2b              /* Cannot get here */

        .align  0
.Lsetjmp_magic:
        .word   _JB_MAGIC_SETJMP
END(longjmp)