/* $NetBSD: compat_setjmp.S,v 1.3 2021/05/25 00:14:41 thorpej Exp $ */

/*
 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Chris G. Demetriou
 * 
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

#include <machine/asm.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,
 * and the previous signal state.
 */

        .set    noreorder

LEAF(setjmp, 1)
        LDGP(pv)
        stq     ra, (2 * 8)(a0)                 /* sc_pc = return address */
        stq     s0, (( 9 + 4) * 8)(a0)          /* saved bits of sc_regs */
        stq     s1, ((10 + 4) * 8)(a0)
        stq     s2, ((11 + 4) * 8)(a0)
        stq     s3, ((12 + 4) * 8)(a0)
        stq     s4, ((13 + 4) * 8)(a0)
        stq     s5, ((14 + 4) * 8)(a0)
        stq     s6, ((15 + 4) * 8)(a0)
        stq     ra, ((26 + 4) * 8)(a0)
        stq     sp, ((30 + 4) * 8)(a0)

        /*
         * get signal information
         */
        mov     a0, s0                          /* squirrel away ptr to sc */

        /* see what's blocked */
        mov     zero, a0
        CALL(sigblock)                          /* see what's blocked */
        stq     v0, (1 * 8)(s0)                 /* and remember it in sc_mask */

        lda     sp, -24(sp)                     /* sizeof struct sigaltstack */
        mov     zero, a0
        mov     sp, a1
        CALL(__sigaltstack14)
        ldl     t0, 16(sp)                      /* offset of ss_flags */
        lda     sp, 24(sp)                      /* sizeof struct sigaltstack */
        ldq     ra, ((26 + 4) * 8)(s0)          /* restore return address */
        blt     v0, botch                       /* check for error */
        and     t0, 0x1, t0                     /* get SA_ONSTACK flag */
        stq     t0, (0 * 8)(s0)                 /* and save it in sc_onstack */
        /*
         * Restore old s0 and a0, and continue saving registers
         */
        mov     s0, a0
        ldq     s0, (( 9 + 4) * 8)(a0)

        ldq     t0, magic                       /* sigcontext magic number */
        stq     t0, ((31 + 4) * 8)(a0)          /* magic in sc_regs[31] */
        /* Too bad we can't check if we actually used FP */
        ldiq    t0, 1
        stq     t0, (36 * 8)(a0)                /* say we've used FP.  */
        stt     fs0, ((2 + 37) * 8)(a0)         /* saved bits of sc_fpregs */
        stt     fs1, ((3 + 37) * 8)(a0)
        stt     fs2, ((4 + 37) * 8)(a0)
        stt     fs3, ((5 + 37) * 8)(a0)
        stt     fs4, ((6 + 37) * 8)(a0)
        stt     fs5, ((7 + 37) * 8)(a0)
        stt     fs6, ((8 + 37) * 8)(a0)
        stt     fs7, ((9 + 37) * 8)(a0)
        mf_fpcr ft0                             /* get FP control reg */
        stt     ft0, (69 * 8)(a0)               /* and store it in sc_fpcr */
        stq     zero, (70 * 8)(a0)              /* FP software control XXX */
        stq     zero, (71 * 8)(a0)              /* sc_reserved[0] */
        stq     zero, (72 * 8)(a0)              /* sc_reserved[1] */
        stq     zero, (73 * 8)(a0)              /* sc_xxx[0] */
        stq     zero, (74 * 8)(a0)              /* sc_xxx[1] */
        stq     zero, (75 * 8)(a0)              /* sc_xxx[2] */
        stq     zero, (76 * 8)(a0)              /* sc_xxx[3] */
        stq     zero, (77 * 8)(a0)              /* sc_xxx[4] */
        stq     zero, (78 * 8)(a0)              /* sc_xxx[5] */
        stq     zero, (79 * 8)(a0)              /* sc_xxx[6] */
        stq     zero, (80 * 8)(a0)              /* sc_xxx[7] */

        mov     zero, v0                        /* return zero */
        RET
END(setjmp)

LEAF(longjmp, 2)
        LDGP(pv)
        bne     a1, 1f                          /* val != 0, just go */
        ldiq    a1, 1                           /* val = 1 otherwise */
1:      stq     a1, (( 0 + 4) * 8)(a0)          /* save return value */
        CALL(sigreturn)                         /* use sigreturn to return */

botch:
        CALL(longjmperror)
        CALL(abort)
        RET                                     /* "can't" get here... */
magic:
        .quad   0xacedbade                      /* sigcontext magic number */
END(longjmp)