/*      $NetBSD: setjmp.S,v 1.22 2025/05/08 00:28:31 uwe 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.
 */

#if !defined(__SOFTFP__) && !defined(__VFP_FP__) && !defined(__ARM_PCS)
#error FPA is not supported anymore
#endif

#if defined(__ARM_EABI__) && !defined(__ARM_PCS_VFP)
        .fpu    vfp
#endif

#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(__setjmp14)
        /* Get the signal mask. */
        push    {r0-r2, lr}
#if !defined(__thumb__)
        adds    r2, r0, #(_JB_SIGMASK * 4)
#else
        movs    r2, r0
        adds    r2, r2, #(_JB_SIGMASK * 4)
#endif
        movs    r1, #0
        movs    r0, #0
        bl      PLT_SYM(_C_LABEL(__sigprocmask14))
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        pop     {r0-r2, lr}
#else
        pop     {r0-r3}
        mov     lr, r3
#endif

        ldr     r1, .Lsetjmp_magic

#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
        ldr     r2, .Lfpu_present
#ifdef __PIC__
        add     r2, r2, pc      /* pc = &.LPIC0 */
#endif
        ldr     r2, [r2]
.LPIC0:
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
        cbz     r2, 1f          /* don't save if we don't have a FPU */
#else
        cmp     r2, #0          /* do we have a FPU? */
        beq     1f              /*   no, don't save VFP registers */
#endif

        orrs    r1, r1, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
                                /* change magic to VFP magic */
        adds    r2, r0, #(_JB_REG_D8 * 4)
        vstmia  r2, {d8-d15}
        vmrs    r2, fpscr
        str     r2, [r0, #(_JB_REG_FPSCR * 4)]
1:
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */

        str     r1, [r0]                /* store magic */

        /* Store integer registers */
        adds    r0, r0, #(_JB_REG_R4 * 4)
#if !defined(__thumb__)
        stmia   r0!, {r4-lr}
#else
        stmia   r0!, {r4-r7}
        mov     r2, r8
        mov     r3, r9
        stmia   r0!, {r2-r3}
        mov     r2, r10
        mov     r3, r11
        stmia   r0!, {r2-r3}
        mov     r2, sp
        mov     r3, lr
        str     r2, [r0, #4]
        str     r3, [r0, #8]
#endif
        movs    r0, #0
        RET

#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
        .align  0
.Lfpu_present:
        .word   REL_SYM(_libc_arm_fpu_present, .LPIC0)
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */
END(__setjmp14)

ENTRY(__longjmp14)
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        ldr     r2, [r0]
        ldr     ip, .Lsetjmp_magic
        bic     r3, r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
#else
        ldr     r3, .Lsetjmp_magic
        mov     ip, r3
        ldr     r3, [r0]
        movs    r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
        bics    r3, r2
        /* r2 is not the magic but we don't need it since we can't do VFP */
#endif
        cmp     r3, ip
        bne     .Lbotch

        /* Validate sp and lr */
        ldr     r2, [r0, #(_JB_REG_R13 * 4)]
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
        cbz     r2, .Lbotch
#else
        cmp     r2, #0
        beq     .Lbotch
#endif

        ldr     r3, [r0, #(_JB_REG_R14 * 4)]
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
        cbz     r3, .Lbotch
#else
        cmp     r3, #0
        beq     .Lbotch
#endif
        mov     sp, r2
        mov     lr, r3

        /* Restore the signal mask. */
        push    {r0-r2, lr}
        movs    r2, #0
#if !defined(__thumb__)
        adds    r1, r0, #(_JB_SIGMASK * 4)
#else
        movs    r1, r0
        adds    r1, r1, #(_JB_SIGMASK * 4)
#endif
        movs    r0, #3                          /* SIG_SETMASK */
        bl      PLT_SYM(_C_LABEL(__sigprocmask14))
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        pop     {r0-r2, lr}
#else
        pop     {r0-r3}
        mov     lr, r3
#endif

#if defined(__ARM_EABI__) && (!defined(__thumb__) || defined(_ARM_ARCH_T2))
        tst     r2, #(_JB_MAGIC_SETJMP ^ _JB_MAGIC_SETJMP_VFP)
                                                /* is this a VFP magic? */
        beq     1f                              /*   no, don't restore VFP */
        adds    r2, r0, #(_JB_REG_D8 * 4)
        vldmia  r2, {d8-d15}
        ldr     r2, [r0, #(_JB_REG_FPSCR * 4)]
        vmsr    fpscr, r2
1:
#endif /* __ARM_EABI__ && (!__thumb__ || _ARM_ARCH_T2) */

        adds    r0, r0, #(_JB_REG_R4 * 4)
        /* Restore integer registers */
#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
        ldmia   r0!, {r4-r12}
#else
        ldmia   r0!, {r4-r7}
        ldmia   r0!, {r2-r3}
        mov     r8, r2
        mov     r9, r3
        ldmia   r0!, {r2-r3}
        mov     r10, r2
        mov     r11, r3
        adds    r0, r0, #4      /* skip ip(r12) */
#endif

        /* Set return value */
        movs    r0, r1
#if !defined(__thumb__)
        moveq   r0, #1
#else
        bne     1f
        movs    r0, #1
1:
#endif
        RET

        /* validation failed, die die die. */
.Lbotch:
        bl      PLT_SYM(_C_LABEL(longjmperror))
        bl      PLT_SYM(_C_LABEL(abort))
1:      b       1b              /* Cannot get here */

        .align  0
.Lsetjmp_magic:
        .word   _JB_MAGIC_SETJMP
END(__longjmp14)