From c77a99ad05676a8f6abf7d5a1f1d0fd3922ac3ca Mon Sep 17 00:00:00 2001 From: christos Date: Sun, 10 Jan 1999 17:16:06 +0000 Subject: [PATCH] First pass at csu stuff for i386/elf. --- lib/csu/i386_elf/Makefile | 44 +++++++ lib/csu/i386_elf/crt0.c | 248 ++++++++++++++++++++++++++++++++++++ lib/csu/i386_elf/crtbegin.c | 123 ++++++++++++++++++ lib/csu/i386_elf/crtend.c | 10 ++ 4 files changed, 425 insertions(+) create mode 100644 lib/csu/i386_elf/Makefile create mode 100644 lib/csu/i386_elf/crt0.c create mode 100644 lib/csu/i386_elf/crtbegin.c create mode 100644 lib/csu/i386_elf/crtend.c diff --git a/lib/csu/i386_elf/Makefile b/lib/csu/i386_elf/Makefile new file mode 100644 index 000000000000..ad7fd0e98792 --- /dev/null +++ b/lib/csu/i386_elf/Makefile @@ -0,0 +1,44 @@ +# $NetBSD: Makefile,v 1.1 1999/01/10 17:16:06 christos Exp $ + +CPPFLAGS+= -DLIBC_SCCS -DPIC -DDYNAMIC -DELFSIZE=32 +CPPFLAGS+= -I${.CURDIR}/../../../libexec/ld.elf_so +COPTS+= -fPIC + +OBJS= crt0.o gcrt0.o crtbegin.o crtend.o + +CLEANFILES+= core a.out + +all: ${OBJS} + +crt0.o: crt0.c + @echo "${COMPILE.c} -DCRT0 ${.ALLSRC} -o ${.TARGET}" + @${COMPILE.c} -DCRT0 ${.ALLSRC} -o ${.TARGET}.o + @${LD} -x -r -o ${.TARGET} ${.TARGET}.o + @rm -f ${.TARGET}.o + +gcrt0.o: crt0.c + @echo "${COMPILE.c} -DMCRT0 ${.ALLSRC} -o ${.TARGET}" + @${COMPILE.c} -DMCRT0 ${.ALLSRC} -o ${.TARGET}.o + @${LD} -x -r -o ${.TARGET} ${.TARGET}.o + @rm -f ${.TARGET}.o + +crtbegin.o: crtbegin.c + @echo "${COMPILE.c} ${.ALLSRC} -o ${.TARGET}" + @${COMPILE.c} ${.ALLSRC} -o ${.TARGET}.o + @${LD} -x -r -o ${.TARGET} ${.TARGET}.o + @rm -f ${.TARGET}.o + +crtend.o: crtend.c + @echo "${COMPILE.c} ${.ALLSRC} -o ${.TARGET}" + @${COMPILE.c} ${.ALLSRC} -o ${.TARGET}.o + @${LD} -x -r -o ${.TARGET} ${.TARGET}.o + @rm -f ${.TARGET}.o + +install: + ${INSTALL} ${COPY} -o ${BINOWN} -g ${BINGRP} -m 444 ${OBJS} \ + ${DESTDIR}/usr/lib + rm -f ${DESTDIR}/usr/lib/crtbeginS.o ${DESTDIR}/usr/lib/crtendS.o + ln ${DESTDIR}/usr/lib/crtbegin.o ${DESTDIR}/usr/lib/crtbeginS.o + ln ${DESTDIR}/usr/lib/crtend.o ${DESTDIR}/usr/lib/crtendS.o + +.include diff --git a/lib/csu/i386_elf/crt0.c b/lib/csu/i386_elf/crt0.c new file mode 100644 index 000000000000..24ebc9bc109d --- /dev/null +++ b/lib/csu/i386_elf/crt0.c @@ -0,0 +1,248 @@ +/* $NetBSD: crt0.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */ + +/* + * Copyright (c) 1995 Christopher G. Demetriou + * 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 Christopher G. Demetriou + * for the NetBSD Project. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ + +#include +#include +#include + +#include +#ifdef DYNAMIC +#include +#include "rtld.h" +#else +typedef void Obj_Entry; +#endif + +/* + * Lots of the chunks of this file cobbled together from pieces of + * other NetBSD crt files, including the common code. + */ + +extern int __syscall __P((int, ...)); +#define _exit(v) __syscall(SYS_exit, (v)) +#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n)) + +#define _FATAL(str) \ + do { \ + write(2, str, sizeof(str)); \ + _exit(1); \ + } while (0) + +static char *_strrchr __P((char *, char)); + + +char **environ; +char *__progname = ""; +struct ps_strings *__ps_strings = 0; + +extern void _init __P((void)); +extern void _fini __P((void)); + +#ifdef DYNAMIC +void rtld_setup __P((void (*)(void), const Obj_Entry *obj)); + +const Obj_Entry *__mainprog_obj; + +/* + * Arrange for _DYNAMIC to be weak and undefined (and therefore to show up + * as being at address zero, unless something else defines it). That way, + * if we happen to be compiling without -static but with without any + * shared libs present, things will still work. + */ +asm(".weak _DYNAMIC"); +extern int _DYNAMIC; +#endif /* DYNAMIC */ + +#ifdef MCRT0 +extern void monstartup __P((u_long, u_long)); +extern void _mcleanup __P((void)); +extern unsigned char _etext, _eprol; +#endif /* MCRT0 */ + +static void ___start __P((int, char **, char **, void (*cleanup) __P((void)), + const Obj_Entry *, struct ps_strings *)); +int main __P((int, char **, char **)); + +__asm(" + .text + .align 2 + .globl __start +__start: + pushl %eax # obj + pushl %ebx # ps_strings + pushl %ecx # cleanup + movl 12(%esp),%eax + leal 20(%esp,%eax,4),%ecx + leal 16(%esp),%edx + pushl %ecx + pushl %edx + pushl %eax + call ___start +"); + +static void +___start(argc, argv, envp, cleanup, obj, ps_strings) + int argc; + char **argv; + char **envp; + void (*cleanup) __P((void)); /* from shared loader */ + const Obj_Entry *obj; /* from shared loader */ + struct ps_strings *ps_strings; +{ + char *namep; + + environ = envp; + + if ((__progname = argv[0]) != NULL) { /* NULL ptr if argc = 0 */ + if ((__progname = _strrchr(__progname, '/')) == NULL) + __progname = argv[0]; + else + __progname++; + } + + if (ps_strings != (struct ps_strings *)0) + __ps_strings = ps_strings; + +#ifdef DYNAMIC + if (&_DYNAMIC != NULL) + rtld_setup(cleanup, obj); +#endif + +#ifdef MCRT0 + atexit(_mcleanup); + monstartup((u_long)&_eprol, (u_long)&_etext); +#endif + + atexit(_fini); + _init(); + + exit(main(argc, argv, environ)); +} + +/* + * NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text. + */ +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: crt0.c,v 1.1 1999/01/10 17:16:06 christos Exp $"); +#endif /* LIBC_SCCS and not lint */ + +static char * +_strrchr(p, ch) +char *p, ch; +{ + char *save; + + for (save = NULL;; ++p) { + if (*p == ch) + save = (char *)p; + if (!*p) + return(save); + } +/* NOTREACHED */ +} + +#ifdef MCRT0 +asm (" .text"); +asm ("_eprol:"); +#endif + +#ifdef DYNAMIC +void +rtld_setup(cleanup, obj) + void (*cleanup) __P((void)); + const Obj_Entry *obj; +{ + + if ((obj == NULL) || (obj->magic != RTLD_MAGIC)) + _FATAL("Corrupt Obj_Entry pointer in GOT"); + if (obj->version != RTLD_VERSION) + _FATAL("Dynamic linker version mismatch"); + + __mainprog_obj = obj; + atexit(cleanup); +} + +void * +dlopen(name, mode) + const char *name; + int mode; +{ + + if (__mainprog_obj == NULL) + return NULL; + return (__mainprog_obj->dlopen)(name, mode); +} + +int +dlclose(fd) + void *fd; +{ + + if (__mainprog_obj == NULL) + return -1; + return (__mainprog_obj->dlclose)(fd); +} + +void * +dlsym(fd, name) + void *fd; + const char *name; +{ + + if (__mainprog_obj == NULL) + return NULL; + return (__mainprog_obj->dlsym)(fd, name); +} + +#if 0 /* not supported for ELF shlibs, apparently */ +int +dlctl(fd, cmd, arg) + void *fd, *arg; + int cmd; +{ + + if (__mainprog_obj == NULL) + return -1; + return (__mainprog_obj->dlctl)(fd, cmd, arg); +} +#endif + +char * +dlerror() +{ + + if (__mainprog_obj == NULL) + return NULL; + return (__mainprog_obj->dlerror)(); +} +#endif /* DYNAMIC */ diff --git a/lib/csu/i386_elf/crtbegin.c b/lib/csu/i386_elf/crtbegin.c new file mode 100644 index 000000000000..12e15ec01667 --- /dev/null +++ b/lib/csu/i386_elf/crtbegin.c @@ -0,0 +1,123 @@ +/* $NetBSD: crtbegin.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */ + +/*- + * Copyright (c) 1998 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Paul Kranenburg. + * + * 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. + */ + +/* + * XXX EVENTUALLY SHOULD BE MERGED BACK WITH c++rt0.c + */ + +/* + * Run-time module which handles constructors and destructors, + * and NetBSD identification. + * + * The linker constructs the following arrays of pointers to global + * constructors and destructors. The first element contains the + * number of pointers in each or -1 to indicate that the run-time + * code should figure out how many there are. The tables are also + * null-terminated. + */ + +#include /* sysident.h requires `NetBSD' constant */ +#include +#include +#include + +#include "sysident.h" + +static void (*__CTOR_LIST__[1]) __P((void)) + __attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */ +static void (*__DTOR_LIST__[1]) __P((void)) + __attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */ + +static void __dtors __P((void)); +static void __ctors __P((void)); + +static void +__dtors() +{ + unsigned long i = (unsigned long) __DTOR_LIST__[0]; + void (**p)(void); + + if (i == -1) { + for (i = 1; __DTOR_LIST__[i] != NULL; i++) + ; + i--; + } + p = __DTOR_LIST__ + i; + while (i--) + (**p--)(); +} + +static void +__ctors() +{ + void (**p)(void) = __CTOR_LIST__ + 1; + + while (*p) + (**p++)(); +} + +extern void _init(void) __attribute__((section(".init"))); + +void +_init() +{ + static int initialized = 0; + static void (*volatile call__ctors)(void) = __ctors; + /* + * Call global constructors. + * Arrange to call global destructors at exit. + */ + /* prevent function pointer constant propagation */ + if (!initialized) { + initialized = 1; + (*call__ctors)(); + } +} + +extern void _fini(void) __attribute__((section(".fini"))); + +void +_fini() +{ + static void (* volatile call__dtors)(void) = __dtors; + /* + * Call global destructors. + */ + /* prevent function pointer constant propagation */ + (*call__dtors)(); +} diff --git a/lib/csu/i386_elf/crtend.c b/lib/csu/i386_elf/crtend.c new file mode 100644 index 000000000000..bf92e4b13247 --- /dev/null +++ b/lib/csu/i386_elf/crtend.c @@ -0,0 +1,10 @@ +/* $NetBSD: crtend.c,v 1.1 1999/01/10 17:16:06 christos Exp $ */ + +#include + +static void (*__CTOR_LIST__[1]) __P((void)) + __attribute__((__unused__)) + __attribute__((section(".ctors"))) = { (void *)0 }; /* XXX */ +static void (*__DTOR_LIST__[1]) __P((void)) + __attribute__((__unused__)) + __attribute__((section(".dtors"))) = { (void *)0 }; /* XXX */