/* $NetBSD: __setjmp14.S,v 1.9 2021/07/06 12:38:40 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>
#include "assym.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(__setjmp14, 1)
        LDGP(pv)
        stq     ra, SC_PC(a0)                   /* sc_pc = return address */
        stq     s0, (SC_REGS+_REG_S0*8)(a0)     /* saved bits of sc_regs */
        stq     s1, (SC_REGS+_REG_S1*8)(a0)
        stq     s2, (SC_REGS+_REG_S2*8)(a0)
        stq     s3, (SC_REGS+_REG_S3*8)(a0)
        stq     s4, (SC_REGS+_REG_S4*8)(a0)
        stq     s5, (SC_REGS+_REG_S5*8)(a0)
        stq     s6, (SC_REGS+_REG_S6*8)(a0)
        stq     ra, (SC_REGS+_REG_RA*8)(a0)
        stq     sp, (SC_REGS+_REG_SP*8)(a0)
        stq     gp, (SC_REGS+_REG_GP*8)(a0)

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

        /* see what's blocked */
        mov     zero, a0                        /* how (insignificant) */
        mov     zero, a1                        /* set (NULL) */
        lda     a2, SC_MASK(s0)                 /* point to mask in sc */
        CALL(__sigprocmask14)

        lda     sp, -32(sp)     /* roundup(sizeof(struct sigaltstack), 16) */
        mov     zero, a0
        mov     sp, a1
        CALL(__sigaltstack14)
        ldl     t0, 16(sp)                      /* offset of ss_flags */
        lda     sp, 32(sp)                      /* pop the sigaltstack */
        ldq     ra, (SC_REGS+_REG_RA*8)(s0)     /* restore return address */
        blt     v0, botch                       /* check for error */
        and     t0, 0x1, t0                     /* get SA_ONSTACK flag */
        stq     t0, SC_ONSTACK(s0)              /* and save it in sc_onstack */
        /*
         * Restore old s0 and a0, and continue saving registers
         */
        mov     s0, a0
        ldq     s0, (SC_REGS+_REG_S0*8)(a0)

        ldq     t0, magic                       /* sigcontext magic number */
        stq     t0, (SC_REGS+_REG_UNIQUE*8)(a0) /* magic in sc_regs[31] */
        /* Too bad we can't check if we actually used FP */
        ldiq    t0, 1
        stq     t0, SC_OWNEDFP(a0)              /* say we've used FP.  */
        stt     fs0, (2*8 + SC_FPREGS)(a0)      /* saved bits of sc_fpregs */
        stt     fs1, (3*8 + SC_FPREGS)(a0)
        stt     fs2, (4*8 + SC_FPREGS)(a0)
        stt     fs3, (5*8 + SC_FPREGS)(a0)
        stt     fs4, (6*8 + SC_FPREGS)(a0)
        stt     fs5, (7*8 + SC_FPREGS)(a0)
        stt     fs6, (8*8 + SC_FPREGS)(a0)
        stt     fs7, (9*8 + SC_FPREGS)(a0)
        excb                                    /* required 4.7.8.1 Alpha ARM */
        mf_fpcr ft0                             /* get FP control reg */
        excb                                    /* required 4.7.8.1 Alpha ARM */
        stt     ft0, SC_FPCR(a0)                /* and store it in sc_fpcr */
        stq     zero, SC_FP_CONTROL(a0)         /* FP software control XXX */
        stq     zero, (SC_RESERVED + 0*8)(a0)   /* sc_reserved[0] */
        stq     zero, (SC_RESERVED + 1*8)(a0)   /* sc_reserved[1] */
        stq     zero, (SC_XXX + 0*8)(a0)        /* sc_xxx[0] */
        stq     zero, (SC_XXX + 1*8)(a0)        /* sc_xxx[1] */
        stq     zero, (SC_XXX + 2*8)(a0)        /* sc_xxx[2] */
        stq     zero, (SC_XXX + 3*8)(a0)        /* sc_xxx[3] */
        stq     zero, (SC_XXX + 4*8)(a0)        /* sc_xxx[4] */
        stq     zero, (SC_XXX + 5*8)(a0)        /* sc_xxx[5] */
        stq     zero, (SC_XXX + 6*8)(a0)        /* sc_xxx[6] */
        stq     zero, (SC_XXX + 7*8)(a0)        /* sc_xxx[7] */

        mov     zero, v0                        /* return zero */
        RET
botch:
        CALL(abort)
        RET                                     /* "can't" get here... */
magic:
        .quad   0xacedbade                      /* sigcontext magic number */
END(__setjmp14)