/*      $OpenBSD: ldasm.S,v 1.24 2019/09/02 12:43:54 mortimer Exp $ */

/*
 * Copyright (c) 1998-2002 Opsycon AB, Sweden.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/syscall.h>

/* Stack at this stage is:
 * struct stack {
 *      int     kargc;
 *      char    *kargv[1];      size depends on kargc
 *      char    kargstr[1];     size varies
 *      char    kenvstr[1];     size varies
 * };
 */

FRAMESZ= MKFSIZ(4,16)
GPOFF= FRAMESZ-2*REGSZ
RAOFF= FRAMESZ-1*REGSZ
A0OFF= FRAMESZ-3*REGSZ
A1OFF= FRAMESZ-4*REGSZ
A2OFF= FRAMESZ-5*REGSZ
A3OFF= FRAMESZ-6*REGSZ
A4OFF= FRAMESZ-7*REGSZ
A5OFF= FRAMESZ-8*REGSZ
A6OFF= FRAMESZ-9*REGSZ
A7OFF= FRAMESZ-10*REGSZ
S0OFF= FRAMESZ-11*REGSZ

LEAF(_dl_start, FRAMESZ)                /* Not really LEAF, but we simplify */
        PTR_SUBU sp, FRAMESZ            # Some space.
        SETUP_GP64(GPOFF, _dl_start)

        LA      s1, 1f
        bgezal  zero, 1f
1:
        PTR_SUBU s0, ra, s1             # This is the load offset

        PTR_ADDU a0, sp, FRAMESZ        # Where stack info is.
        PTR_ADDU a1, sp, 0              # Where fast AUX info will be.
        LA      a2, _DYNAMIC
        PTR_ADDU a2, s0                 # Where _DYNAMIC is
        LA      t9, _dl_boot_bind
        PTR_ADDU t9, s0
        jalr    t9                      # Relocate ourself.

        REG_L   a3, FRAMESZ(sp)         # argc
        PTR_ADDU a0, sp, FRAMESZ+REGSZ  # argv
        PTR_ADDU a1, a0, REGSZ
        PTR_SLL  a3, a3, LOGREGSZ
        PTR_ADDU a1, a3
        PTR_ADDU a3, sp, 0              # Where fast AUX info will be.
        move    a2, s0                  # Load offset
        jal     _dl_boot                # Go do the linking.

        move    t9, v0                  # Entry address from _dl_boot.
        LA      v0, _dl_dtors           # cleanup

        RESTORE_GP64
        PTR_ADDU sp, FRAMESZ            # Restore stack pointer.
        move    ra, zero                # Mark last stack frame.
        j       t9                      # Go execute the 'real' program.
END(_dl_start)

        .globl  _dl_bind_start
        .ent    _dl_bind_start, 0
_dl_bind_start:
        ld      v1, -32744(gp)
        PTR_SUBU sp, FRAMESZ
        SETUP_GP64(GPOFF, _dl_bind_start)
        REG_S   a0, A0OFF(sp)
        REG_S   a1, A1OFF(sp)
        REG_S   a2, A2OFF(sp)
        REG_S   a3, A3OFF(sp)
        REG_S   a4, A4OFF(sp)
        REG_S   a5, A5OFF(sp)
        REG_S   a6, A6OFF(sp)
        REG_S   a7, A7OFF(sp)
        REG_S   $15, RAOFF(sp)
        REG_S   s0, S0OFF(sp)
        move    s0, sp
        move    a0, v1
        move    a1, t8
        jal     _dl_bind

        move    sp, s0
        REG_L   ra, RAOFF(sp)
        REG_L   s0, S0OFF(sp)
        REG_L   a0, A0OFF(sp)
        REG_L   a1, A1OFF(sp)
        REG_L   a2, A2OFF(sp)
        REG_L   a3, A3OFF(sp)
        REG_L   a4, A4OFF(sp)
        REG_L   a5, A5OFF(sp)
        REG_L   a6, A6OFF(sp)
        REG_L   a7, A7OFF(sp)
        RESTORE_GP64
        PTR_ADDU sp, FRAMESZ
        move    t9, v0
        jr      t9
        .end    _dl_bind_start