/* $OpenBSD: md_init.h,v 1.19 2024/08/17 09:48:31 phessler Exp $ */

/*-
 * Copyright (c) 2001 Ross Harvey
 * 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 the NetBSD
 *      Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * arm overrides these because it uses %progbits instead of @progbits
 */
#define MD_DATA_SECTION_FLAGS_SYMBOL(section, flags, type, symbol)      \
        extern __dso_hidden type symbol[];                              \
        __asm(" .section "section",\""flags"\",%progbits                \n" \
        "       .balign 4                                               \n" \
        #symbol":                                                       \n" \
        "       .previous")
#define MD_DATA_SECTION_SYMBOL_VALUE(section, type, symbol, value)      \
        extern __dso_hidden type symbol[];                              \
        __asm(" .section "section",\"aw\",%progbits                     \n" \
        "       .balign 4                                               \n" \
        #symbol":                                                       \n" \
        "       .int "#value"                                           \n" \
        "       .previous")
#define MD_DATA_SECTION_FLAGS_VALUE(section, flags, value)              \
        __asm(" .section "section",\""flags"\",%progbits                \n" \
        "       .balign 4                                               \n" \
        "       .int "#value"                                           \n" \
        "       .previous")

#define MD_SECT_CALL_FUNC(section, func) \
        __asm (".section "#section", \"ax\"             \n" \
        "       movw    r0, #:lower16:" #func "- 1f - 8 \n" \
        "       movt    r0, #:upper16:" #func "- 1f - 8 \n" \
        "1:     add     r0, r0, pc                      \n" \
        "       blx     r0                              \n" \
        "       .previous")

#define MD_SECTION_PROLOGUE(sect, entry_pt)     \
        __asm (                                 \
        ".section "#sect",\"ax\",%progbits      \n" \
        "       .globl " #entry_pt "            \n" \
        "       .type " #entry_pt ",%function   \n" \
        "       .align 4                        \n" \
        #entry_pt":                             \n" \
        "       push    {r4, lr}                \n" \
        "       /* fall thru */                 \n" \
        "       .previous")


#define MD_SECTION_EPILOGUE(sect)               \
        __asm (                                 \
        ".section "#sect",\"ax\",%progbits      \n" \
        "       pop     {r4, pc}                \n" \
        "       .previous")


/*
 * The definitions of environ and __progname prevent the creation
 * of COPY relocations for WEAK symbols.
 */
#define MD_CRT0_START                           \
        __asm(                                  \
        ".text                                  \n" \
        "       .align  0                       \n" \
        "       .globl  _start                  \n" \
        "       .globl  __start                 \n" \
        "_start:                                \n" \
        "__start:                               \n" \
        "       mov     r3, r0  /* cleanup */   \n" \
        "/* Get argc/argv/envp from stack */    \n" \
        "       ldr     r0, [sp, #0]            \n" \
        "       add     r1, sp, #4              \n" \
        "       add     r2, r1, r0, lsl #2      \n" \
        "       add     r2, r2, #4              \n" \
        "                                       \n" \
        "/*                                     \n" \
        " * Ensure the stack is properly        \n" \
        " * aligned before calling C code.      \n" \
        " */                                    \n" \
        "       bic     sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ "     \n" \
        "       b       ___start                \n" \
        ".previous");

#define MD_RCRT0_START                          \
        char **environ, *__progname;            \
        __asm(                                  \
        ".text                                  \n" \
        "       .align  0                       \n" \
        "       .globl  _start                  \n" \
        "       .globl  __start                 \n" \
        "_start:                                \n" \
        "__start:                               \n" \
        "       mov     fp, sp                  \n" \
        "       mov     r0, fp                  \n" \
        "                                       \n" \
        "       sub     sp, sp, #4+4+(16*4)     \n" \
        "       add     r1, sp, #4              \n" \
        "                                       \n" \
        "       ldr     r8, .L_GOT              \n" \
        "1:     add     r8, pc, r8              \n" \
        "       ldr     r2, .L__DYNAMIC         \n" \
        "       add     r2, r2, r8              \n" \
        "                                       \n" \
        "       bl      _dl_boot_bind           \n" \
        "                                       \n" \
        "       mov     sp, fp                  \n" \
        "       mov     fp, #0                  \n" \
        "                                       \n" \
        "       mov     r3, #0  /* cleanup */   \n" \
        "/* Get argc/argv/envp from stack */    \n" \
        "       ldr     r0, [sp, #0]            \n" \
        "       add     r1, sp, #4              \n" \
        "       add     r2, r1, r0, lsl #2      \n" \
        "       add     r2, r2, #4              \n" \
        "                                       \n" \
        "/*                                     \n" \
        " * Ensure the stack is properly        \n" \
        " * aligned before calling C code.      \n" \
        " */                                    \n" \
        "       bic     sp, sp, #7" /*__STRING(STACKALIGNBYTES)*/ "     \n" \
        "       b       ___start                \n" \
        "                                       \n" \
        ".L_GOT:                                \n" \
        "       .long   _GLOBAL_OFFSET_TABLE_-(1b+8)    \n" \
        ".L__DYNAMIC:                           \n" \
        "       .long   _DYNAMIC(GOTOFF)        \n" \
        "                                       \n" \
        "_csu_abort:                            \n" \
        "       udf     #0                      \n" \
        ".previous");