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/* $OpenBSD: md_init.h,v 1.17 2020/10/19 17:57:40 naddy 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 \
char **environ, *__progname; \
__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" \
"_dl_exit: \n" \
" mov r12, #" STR(SYS_exit) " \n" \
" swi #0 \n" \
" dsb nsh \n" \
" isb \n" \
" udf #0 \n" \
".previous");
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