238 lines
5.0 KiB
C
238 lines
5.0 KiB
C
/* $NetBSD: crt0.c,v 1.20 1997/10/14 11:45:25 is Exp $ */
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/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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/*
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* XXX should be __RCSID(), but the const char used in there currently
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* makes our ld bus error.
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*/
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static char __rcsid[] __attribute__((__unused__)) =
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"$NetBSD: crt0.c,v 1.20 1997/10/14 11:45:25 is Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <stdlib.h>
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#include "common.h"
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extern unsigned char etext;
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extern unsigned char eprol __asm__ ("eprol");
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extern void start __P((void)) __asm__ ("start");
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#if defined(sun) && defined(sparc)
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static void __call __P((void));
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#endif
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#ifdef BSD
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#undef mmap
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#define mmap(addr, len, prot, flags, fd, off) \
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__syscall2((quad_t)SYS_mmap, (addr), (len), (prot), (flags), \
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(fd), 0, (off_t)(off))
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extern int __syscall2 __P((quad_t, ...));
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#endif
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__asm__("
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.global start
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.text
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start:
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");
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/*
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* Set up `argc', `argv', and `envp' into local registers.
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*/
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__asm__("
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mov 0, %fp
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ld [%sp + 64], %l0 ! get argc
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add %sp, 68, %l1 ! get argv
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sll %l0, 2, %l2 !
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add %l2, 4, %l2 ! envp = argv + (argc << 2) + 4
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add %l1, %l2, %l2 !
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sethi %hi(_environ), %l3
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st %l2, [%l3+%lo(_environ)] ! *environ = l2
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");
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/*
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* We get a pointer to PSSTRINGS in %g1.
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*/
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__asm__("
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cmp %g1, 0
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be 1f
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sethi %hi(___ps_strings), %l3
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st %g1, [%l3+%lo(___ps_strings)]
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1:
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");
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/*
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* Finish diddling with stack.
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*/
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__asm__("
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andn %sp, 7, %sp ! align
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sub %sp, 24, %sp ! expand to standard stack frame size
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");
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/*
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* Set __progname:
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* if (argv[0])
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* if ((__progname = _strrchr(argv[0], '/')) == NULL)
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* __progname = argv[0];
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* else
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* ++__progname;
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*/
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__asm__("
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ld [%l1], %o0
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cmp %o0, 0
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mov %o0, %l6
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be 1f
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sethi %hi(___progname), %l7
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");
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#ifdef DYNAMIC
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__asm__("call __strrchr");
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#else
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__asm__("call _strrchr");
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#endif
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__asm__("
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mov 47, %o1
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cmp %o0, 0
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be,a 1f
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st %l6, [%l7+%lo(___progname)]
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add %o0, 1, %o0
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st %o0, [%l7+%lo(___progname)]
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1:
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");
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#ifdef DYNAMIC
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/* Resolve symbols in dynamic libraries */
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__asm__("
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sethi %hi(__DYNAMIC), %o0
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orcc %o0, %lo(__DYNAMIC), %o0
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be 1f
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nop
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call ___load_rtld
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nop
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1:
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");
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#endif
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/* From here, all symbols should have been resolved, so we can use libc */
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#ifdef MCRT0
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/*
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* atexit(_mcleanup);
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* monstartup((u_long)&eprol, (u_long)&etext);
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*/
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__asm__("
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sethi %hi(__mcleanup), %o0
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call _atexit
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or %o0, %lo(__mcleanup), %o0
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sethi %hi(_eprol), %o0
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or %o0, %lo(_eprol), %o0
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sethi %hi(_etext), %o1
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call _monstartup
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or %o1, %lo(_etext), %o1
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");
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#endif
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#ifdef sun
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/*
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* SunOS compatibility
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*/
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__asm__("
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call start_float
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nop
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");
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#endif
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/*
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* Move `argc', `argv', and `envp' from locals to parameters for `main'.
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*/
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__asm__("
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mov %l0,%o0
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mov %l1,%o1
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__callmain:
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call _main
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mov %l2,%o2
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call _exit
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nop
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");
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#ifdef DYNAMIC
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/*
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* System call entry
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*/
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__asm__("
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.set SYSCALL_G2RFLAG, 0x400
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.set SYS___syscall, 198
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___syscall2:
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sethi %hi(SYS___syscall), %g1
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ba 1f
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or %g1, %lo(SYS___syscall), %g1
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___syscall:
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clr %g1
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1:
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or %g1, SYSCALL_G2RFLAG, %g1
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add %o7, 8, %g2
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ta %g0
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mov -0x1, %o0
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jmp %o7 + 0x8
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mov -0x1, %o1
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");
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#endif
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#ifdef sun
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static
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__call()
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{
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/*
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* adjust the C generated pointer to the crt struct to the
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* likings of ld.so, which is an offset relative to its %fp
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*/
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__asm__("
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mov %i0, %o0
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mov %i1, %o1
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call %i2
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sub %o1, %sp, %o1
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");
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/*NOTREACHED, control is transferred directly to our caller */
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}
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#endif
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#include "common.c"
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#ifdef MCRT0
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__asm__ ("
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.text
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_eprol:
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");
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#endif
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