/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* Copyright 2016, Richard Lowe. */

#include <sys/asm_linkage.h>
#include <sys/stack.h>

        .file   "mach-crt1.s"
        .ident  ""

        .global _start_crt

#if defined(__sparcv9)
#define EB_MAX_SIZE     128
#else
#define EB_MAX_SIZE     64
#endif

ENTRY_NP(_start)
        /*
         * On entry, the stack is:
         *
         * .-----------------------.   <--- %sp
         * |                       |
         * |        Window         |
         * |                       |
         * |-----------------------|
         * |        argc           |
         * |-----------------------|
         * |        argv[0]        |
         * |        argv[1]        |
         * |        argv[2]        |
         * |        argv[3]        |
         * |        ...            |
         * |     argv[argc - 1]    |
         * |-----------------------|
         * |          NULL         |
         * |-----------------------|
         * |        envp[0]        |
         * |        envp[1]        |
         * |        envp[2]        |
         * |        envp[3]        |
         * |         ...           |
         * |        envp[N]        |
         * |-----------------------|
         * |          NULL         |
         * .-----------------------.
         *
         * and an exit handler from the linker is in %g1
         */
        clr     %fp             ! don't trace the stack past this point

        add     %sp, WINDOWSIZE + STACK_BIAS, %l0       ! address of argc

        ! allocate a minimally sized frame, and align ourselves
        add     %sp, -SA(MINFRAME - EB_MAX_SIZE), %sp

        ldn     [%l0], %o0                      ! argc
        add     %l0, CPTRSIZE, %o1      ! argv
        call    _start_crt
            mov %g1, %o2                        ! exit_handler in delay slot
SET_SIZE(_start)