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/* $OpenBSD: md_init.h,v 1.9 2020/10/15 16:30:23 deraadt Exp $ */
/*
* Copyright (c) 2012 Miodrag Vallat.
*
* 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 ( \
"\t.section\t" #section ",\"ax\",@progbits\n" \
"\tbsr\t" #func "\n" \
"\t.previous")
#define MD_SECTION_PROLOGUE(section, entry) __asm ( \
"\t.section\t" #section ",\"ax\",@progbits\n" \
"\t.globl\t" #entry "\n" \
"\t.type\t" #entry ",@function\n" \
"\t.align\t2\n" \
#entry ":\n" \
"\tsubu\t%r31, %r31, 16\n" \
"\tst\t%r1, %r31, 0\n" \
"\t.previous")
#define MD_SECTION_EPILOGUE(section) __asm( \
"\t.section\t" #section ",\"ax\",@progbits\n" \
"\tld\t%r1, %r31, 0\n" \
"\tjmp.n\t%r1\n" \
"\taddu\t%r31, %r31, 16\n" \
"\t.previous")
/*
* When a program begins, r31 points to a structure passed by the kernel.
*
* This structure contains argc, the argv[] NULL-terminated array, and
* the envp[] NULL-terminated array.
*
* Our start code starts with two nops because execution may skip up to
* two instructions; see setregs() in the kernel for details.
*
* 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 3 \n" \
" .globl __start \n" \
" .globl _start \n" \
"__start: \n" \
"_start: \n" \
" or %r0, %r0, %r0 \n" \
" or %r0, %r0, %r0 \n" \
" ld %r2, %r31, 0 /* argc */ \n" \
" addu %r3, %r31, 4 /* argv */ \n" \
" lda %r4, %r3[%r2] \n" \
" br.n ___start \n" \
" addu %r4, %r4, 4 \n" \
" /* envp = argv + argc + 1 */ \n" \
" .previous");
#define MD_RCRT0_START \
__asm( \
" .text \n" \
" .align 3 \n" \
" .globl __start \n" \
" .globl _start \n" \
"__start: \n" \
"_start: \n" \
" or %r0, %r0, %r0 \n" \
" or %r0, %r0, %r0 \n" \
\
" or %r2, %r31, 0 \n" \
" subu %r31, %r31, 4*16 \n" \
" or %r3, %r31, 0 \n" \
" bsr 1f \n" \
" bsr _DYNAMIC#plt \n" \
"1: ld %r6, %r1, 0 \n" \
" mak %r5, %r6, 26<2> \n" \
" addu %r4, %r5, %r1 \n" \
" bsr _dl_boot_bind#plt \n" \
" addu %r31, %r31, 4*16 \n" \
\
" ld %r2, %r31, 0 /* argc */ \n" \
" addu %r3, %r31, 4 /* argv */ \n" \
" lda %r4, %r3[%r2] \n" \
" or %r5, %r0, %r0 /* cleanup */ \n" \
" br.n ___start \n" \
" addu %r4, %r4, 4 \n" \
" /* envp = argv + argc + 1 */ \n" \
\
"_dl_exit: \n" \
" or %r13, %r0, " STR(SYS_exit) " \n" \
" tb0 0, %r0, 450 \n" \
" or %r0, %r0, %r0 \n" \
" tb0 0, %r0, 130 /* breakpoint */ \n" \
" .previous");
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