First pass at csu stuff for i386/elf.
This commit is contained in:
christos
parent
d47a7fb7e0
commit
c77a99ad05
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# $NetBSD: Makefile,v 1.1 1999/01/10 17:16:06 christos Exp $
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CPPFLAGS+= -DLIBC_SCCS -DPIC -DDYNAMIC -DELFSIZE=32
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CPPFLAGS+= -I${.CURDIR}/../../../libexec/ld.elf_so
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COPTS+= -fPIC
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OBJS= crt0.o gcrt0.o crtbegin.o crtend.o
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CLEANFILES+= core a.out
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all: ${OBJS}
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crt0.o: crt0.c
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@echo "${COMPILE.c} -DCRT0 ${.ALLSRC} -o ${.TARGET}"
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@${COMPILE.c} -DCRT0 ${.ALLSRC} -o ${.TARGET}.o
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@${LD} -x -r -o ${.TARGET} ${.TARGET}.o
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@rm -f ${.TARGET}.o
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gcrt0.o: crt0.c
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@echo "${COMPILE.c} -DMCRT0 ${.ALLSRC} -o ${.TARGET}"
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@${COMPILE.c} -DMCRT0 ${.ALLSRC} -o ${.TARGET}.o
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@${LD} -x -r -o ${.TARGET} ${.TARGET}.o
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@rm -f ${.TARGET}.o
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crtbegin.o: crtbegin.c
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@echo "${COMPILE.c} ${.ALLSRC} -o ${.TARGET}"
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@${COMPILE.c} ${.ALLSRC} -o ${.TARGET}.o
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@${LD} -x -r -o ${.TARGET} ${.TARGET}.o
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@rm -f ${.TARGET}.o
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crtend.o: crtend.c
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@echo "${COMPILE.c} ${.ALLSRC} -o ${.TARGET}"
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@${COMPILE.c} ${.ALLSRC} -o ${.TARGET}.o
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@${LD} -x -r -o ${.TARGET} ${.TARGET}.o
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@rm -f ${.TARGET}.o
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install:
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${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m 444 ${OBJS} \
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${DESTDIR}/usr/lib
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rm -f ${DESTDIR}/usr/lib/crtbeginS.o ${DESTDIR}/usr/lib/crtendS.o
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ln ${DESTDIR}/usr/lib/crtbegin.o ${DESTDIR}/usr/lib/crtbeginS.o
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ln ${DESTDIR}/usr/lib/crtend.o ${DESTDIR}/usr/lib/crtendS.o
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.include <bsd.prog.mk>
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@ -0,0 +1,248 @@
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/* $NetBSD: crt0.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */
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/*
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* Copyright (c) 1995 Christopher G. Demetriou
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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 Christopher G. Demetriou
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* for the NetBSD Project.
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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/types.h>
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#include <sys/exec.h>
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#include <sys/syscall.h>
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#include <stdlib.h>
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#ifdef DYNAMIC
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#include <dlfcn.h>
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#include "rtld.h"
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#else
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typedef void Obj_Entry;
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#endif
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/*
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* Lots of the chunks of this file cobbled together from pieces of
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* other NetBSD crt files, including the common code.
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*/
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extern int __syscall __P((int, ...));
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#define _exit(v) __syscall(SYS_exit, (v))
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#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
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#define _FATAL(str) \
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do { \
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write(2, str, sizeof(str)); \
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_exit(1); \
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} while (0)
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static char *_strrchr __P((char *, char));
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char **environ;
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char *__progname = "";
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struct ps_strings *__ps_strings = 0;
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extern void _init __P((void));
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extern void _fini __P((void));
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#ifdef DYNAMIC
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void rtld_setup __P((void (*)(void), const Obj_Entry *obj));
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const Obj_Entry *__mainprog_obj;
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/*
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* Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
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* as being at address zero, unless something else defines it). That way,
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* if we happen to be compiling without -static but with without any
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* shared libs present, things will still work.
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*/
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asm(".weak _DYNAMIC");
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extern int _DYNAMIC;
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#endif /* DYNAMIC */
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#ifdef MCRT0
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extern void monstartup __P((u_long, u_long));
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extern void _mcleanup __P((void));
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extern unsigned char _etext, _eprol;
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#endif /* MCRT0 */
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static void ___start __P((int, char **, char **, void (*cleanup) __P((void)),
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const Obj_Entry *, struct ps_strings *));
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int main __P((int, char **, char **));
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__asm("
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.text
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.align 2
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.globl __start
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__start:
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pushl %eax # obj
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pushl %ebx # ps_strings
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pushl %ecx # cleanup
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movl 12(%esp),%eax
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leal 20(%esp,%eax,4),%ecx
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leal 16(%esp),%edx
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pushl %ecx
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pushl %edx
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pushl %eax
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call ___start
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");
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static void
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___start(argc, argv, envp, cleanup, obj, ps_strings)
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int argc;
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char **argv;
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char **envp;
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void (*cleanup) __P((void)); /* from shared loader */
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const Obj_Entry *obj; /* from shared loader */
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struct ps_strings *ps_strings;
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{
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char *namep;
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environ = envp;
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if ((__progname = argv[0]) != NULL) { /* NULL ptr if argc = 0 */
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if ((__progname = _strrchr(__progname, '/')) == 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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if (ps_strings != (struct ps_strings *)0)
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__ps_strings = ps_strings;
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#ifdef DYNAMIC
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if (&_DYNAMIC != NULL)
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rtld_setup(cleanup, obj);
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#endif
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#ifdef MCRT0
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atexit(_mcleanup);
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monstartup((u_long)&_eprol, (u_long)&_etext);
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#endif
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atexit(_fini);
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_init();
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exit(main(argc, argv, environ));
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}
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/*
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* NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: crt0.c,v 1.1 1999/01/10 17:16:06 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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static char *
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_strrchr(p, ch)
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char *p, ch;
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{
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char *save;
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for (save = NULL;; ++p) {
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if (*p == ch)
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save = (char *)p;
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if (!*p)
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return(save);
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}
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/* NOTREACHED */
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}
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#ifdef MCRT0
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asm (" .text");
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asm ("_eprol:");
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#endif
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#ifdef DYNAMIC
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void
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rtld_setup(cleanup, obj)
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void (*cleanup) __P((void));
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const Obj_Entry *obj;
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{
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if ((obj == NULL) || (obj->magic != RTLD_MAGIC))
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_FATAL("Corrupt Obj_Entry pointer in GOT");
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if (obj->version != RTLD_VERSION)
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_FATAL("Dynamic linker version mismatch");
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__mainprog_obj = obj;
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atexit(cleanup);
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}
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void *
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dlopen(name, mode)
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const char *name;
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int mode;
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{
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if (__mainprog_obj == NULL)
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return NULL;
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return (__mainprog_obj->dlopen)(name, mode);
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}
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int
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dlclose(fd)
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void *fd;
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{
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if (__mainprog_obj == NULL)
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return -1;
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return (__mainprog_obj->dlclose)(fd);
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}
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void *
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dlsym(fd, name)
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void *fd;
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const char *name;
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{
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if (__mainprog_obj == NULL)
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return NULL;
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return (__mainprog_obj->dlsym)(fd, name);
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}
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#if 0 /* not supported for ELF shlibs, apparently */
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int
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dlctl(fd, cmd, arg)
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void *fd, *arg;
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int cmd;
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{
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if (__mainprog_obj == NULL)
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return -1;
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return (__mainprog_obj->dlctl)(fd, cmd, arg);
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}
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#endif
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char *
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dlerror()
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{
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if (__mainprog_obj == NULL)
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return NULL;
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return (__mainprog_obj->dlerror)();
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}
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#endif /* DYNAMIC */
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@ -0,0 +1,123 @@
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/* $NetBSD: crtbegin.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Kranenburg.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* XXX EVENTUALLY SHOULD BE MERGED BACK WITH c++rt0.c
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*/
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/*
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* Run-time module which handles constructors and destructors,
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* and NetBSD identification.
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*
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* The linker constructs the following arrays of pointers to global
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* constructors and destructors. The first element contains the
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* number of pointers in each or -1 to indicate that the run-time
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* code should figure out how many there are. The tables are also
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* null-terminated.
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*/
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#include <sys/param.h> /* sysident.h requires `NetBSD' constant */
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#include <sys/exec.h>
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#include <sys/exec_elf.h>
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#include <stdlib.h>
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#include "sysident.h"
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static void (*__CTOR_LIST__[1]) __P((void))
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__attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */
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static void (*__DTOR_LIST__[1]) __P((void))
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__attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */
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static void __dtors __P((void));
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static void __ctors __P((void));
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static void
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__dtors()
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{
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unsigned long i = (unsigned long) __DTOR_LIST__[0];
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void (**p)(void);
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if (i == -1) {
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for (i = 1; __DTOR_LIST__[i] != NULL; i++)
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;
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i--;
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}
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p = __DTOR_LIST__ + i;
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while (i--)
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(**p--)();
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}
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static void
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__ctors()
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{
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void (**p)(void) = __CTOR_LIST__ + 1;
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while (*p)
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(**p++)();
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}
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extern void _init(void) __attribute__((section(".init")));
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void
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_init()
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{
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static int initialized = 0;
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static void (*volatile call__ctors)(void) = __ctors;
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/*
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* Call global constructors.
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* Arrange to call global destructors at exit.
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*/
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/* prevent function pointer constant propagation */
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if (!initialized) {
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initialized = 1;
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(*call__ctors)();
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}
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}
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extern void _fini(void) __attribute__((section(".fini")));
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void
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_fini()
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{
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static void (* volatile call__dtors)(void) = __dtors;
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/*
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* Call global destructors.
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*/
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/* prevent function pointer constant propagation */
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(*call__dtors)();
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}
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@ -0,0 +1,10 @@
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/* $NetBSD: crtend.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */
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#include <sys/cdefs.h>
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static void (*__CTOR_LIST__[1]) __P((void))
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__attribute__((__unused__))
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__attribute__((section(".ctors"))) = { (void *)0 }; /* XXX */
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static void (*__DTOR_LIST__[1]) __P((void))
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__attribute__((__unused__))
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__attribute__((section(".dtors"))) = { (void *)0 }; /* XXX */
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