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/* $OpenBSD: md_init.h,v 1.3 2015/09/01 05:40:06 guenther 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.
*/
#define MD_CRT0_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" \
" 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");
#include <sys/syscall.h>
#define MD_DISABLE_KBIND \
do { \
register long syscall_num __asm("r13") = SYS_kbind; \
register void *arg1 __asm("r2") = NULL; \
__asm volatile("tb0 0, %%r0, 450; or %%r0, %%r0, %%r0" \
: "+r" (arg1) : "r" (syscall_num) : "r3", "cc"); \
} while (0)
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