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/* $OpenBSD: md_init.h,v 1.4 2013/12/04 00:20:31 deraadt Exp $ */
/*-
* Copyright (c) 2001 Ross Harvey
* Copyright (c) 2001 Simon Burge
* 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.
*/
#define ra "$31"
/*
* Allocate 32 bytes for the stack frame. Store GP at SP+16 (since
* this is where code generated by the compiler for fallthru processing
* expects it to be), and the RA at SP+24.
*/
/* this is gross... */
#ifdef __ABICALLS__
#define MD_FUNCTION_PROLOGUE(entry_pt) \
" .frame $sp,32,$31 \n" \
" .set reorder \n" \
" dsubu $sp,$sp,32 \n" \
" .cpsetup $25, 16, "#entry_pt" \n" \
" sd "ra",24($sp) \n"
#else
#define MD_FUNCTION_PROLOGUE(entry_pt) \
" dsubu $sp,$sp,32 \n" \
" sd "ra",24($sp) \n"
#endif
#define MD_SECTION_PROLOGUE(sect, entry_pt) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
".align 2 \n" \
".globl "#entry_pt" \n" \
".type "#entry_pt"@function \n" \
".ent "#entry_pt" \n" \
#entry_pt": \n" \
MD_FUNCTION_PROLOGUE(entry_pt) \
" /* fall thru */ \n" \
".previous")
#define MD_SECTION_EPILOGUE(sect) \
__asm ( \
".section "#sect",\"ax\",@progbits \n" \
" ld "ra",24($sp) \n" \
" # next should have been a .cpreturn \n" \
" ld $gp,16($sp) \n" \
" .set noreorder \n" \
" j "ra" \n" \
" daddu $sp,$sp,32 \n" \
" .set reorder \n" \
".previous")
#define MD_SECT_CALL_FUNC(section, func) \
__asm (".section "#section", \"ax\" \n" \
" jal " #func " \n" \
".previous")
struct kframe {
long kargc;
char *kargv[1]; /* size depends on kargc */
char kargstr[1]; /* size varies */
char kenvstr[1]; /* size varies */
};
#define MD_START __start
#define MD_START_ARGS void
/*
* XXX no cleanup() callback passed to __start yet. Need to pull
* it from v0 in ASM?
*/
#define MD_NO_CLEANUP
/*
* Do GP register setup and find the kframe struct. Differs depending
* on shared lib stuff or not.
* XXX just above the saved frame pointer?
* kfp = (struct kframe *) (¶m-1);
*/
#if defined(_NO_ABICALLS)
#define SETUP_KFP(kfp) \
asm(" dla $28,_gp \n" \
" daddiu %0,$29,32" : "=r" (kfp))
#else
#define SETUP_KFP(kfp) \
asm(" daddiu %0,$29,48" : "=r" (kfp))
#endif
#define MD_START_SETUP \
struct kframe *kfp; \
char **argv, **envp; \
int argc; \
\
SETUP_KFP(kfp); \
argc = kfp->kargc; \
argv = &kfp->kargv[0]; \
environ = envp = argv + argc + 1;
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