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/* $OpenBSD: md_init.h,v 1.4 2020/10/15 16:30:23 deraadt Exp $ */
/*
* Copyright (c) 2020 Dale Rahn <drahn@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#define MD_SECT_CALL_FUNC(section, func) \
__asm (".section "#section", \"ax\" \n" \
" bl " #func " \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" \
".L_"sect"_gep: \n" \
" addis %r2, %r12, .TOC.-.L_"sect"_gep@ha \n" \
" addi %r2, %r2, .TOC.-.L_"sect"_gep@l \n" \
".L_"sect"_lep: \n" \
" .localentry " #entry_pt", .L_"sect"_lep-.L_"sect"_gep; \n" \
" mflr %r0 \n" \
" std %r0,16(%r1) \n" \
" stdu %r1,-64(%r1) \n" \
" /* fall thru */ \n" \
" .previous")
#define MD_SECTION_EPILOGUE(sect) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
" addi %r1,%r1,64 \n" \
" ld %r0,16(%r1) \n" \
" mtlr %r0 \n" \
" blr \n" \
" .previous")
#define MD_CRT0_START \
__asm( \
" .text \n" \
" .section \".text\" \n" \
" .align 2 \n" \
" .globl _start \n" \
" .type _start, @function \n" \
" .globl __start \n" \
" .type __start, @function \n" \
"_start: \n" \
"__start: \n" \
" bl 1f \n" \
"1: \n" \
" mflr %r30 \n" \
" addis %r2, %r30, .TOC.-1b@ha \n" \
" addi %r2, %r2, .TOC.-1b@l \n" \
" # put cleanup in r6 instead of r7 \n" \
" mr %r6, %r7 \n" \
" li %r7, 0 \n" \
" stdu %r7, -64(%r1) \n" \
" b ___start \n" \
)
#define MD_RCRT0_START \
__asm( \
" .text \n" \
" .section \".text\" \n" \
" .align 2 \n" \
" .globl _start \n" \
" .type _start, @function \n" \
" .globl __start \n" \
" .type __start, @function \n" \
"_start: \n" \
"__start: \n" \
" bl 1f \n" \
"1: \n" \
" mflr %r31 \n" \
" addis %r2, %r31, .TOC.-1b@ha \n" \
" addi %r2, %r2, .TOC.-1b@l \n" \
" stdu 1, (-48 -((9+3)*8))(%r1) # allocate dl_data \n" \
" \n" \
" # Preserve program parameters during setup \n" \
" mr %r15, %r3 # argc \n" \
" mr %r16, %r4 # argv \n" \
" mr %r17, %r5 # envp \n" \
" \n" \
" addis %r14, %r2, _DYNAMIC@toc@ha \n" \
" addi %r14, %r14, _DYNAMIC@toc@l \n" \
" \n" \
" subi %r3, %r16, 8 # pointer to argc on stack. \n" \
" addi %r4, %r1, 48 # dl_data \n" \
" mr %r5, %r14 # dynamicp \n" \
" \n" \
" bl _dl_boot_bind \n" \
" \n" \
" # restore program arguments \n" \
" mr %r3, %r15 \n" \
" mr %r4, %r16 \n" \
" mr %r5, %r17 \n" \
" li %r6, 0 \n" \
" bl ___start \n" \
" \n" \
" .globl _dl_exit \n" \
" .type _dl_exit, @function \n" \
"_dl_exit: \n" \
" li %r0, " STR(SYS_exit) " \n" \
" sc \n" \
" .long 0 # illegal \n" \
)
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