diff options
| author | Eric Andersen <andersen@codepoet.org> | 2001-06-15 19:58:36 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2001-06-15 19:58:36 +0000 |
| commit | 1a5c8c4765bd07f9503282b9db75aa4466016660 (patch) | |
| tree | 5d1bc5440d5c3cec610b6a788f8273b265bf93d2 | |
| parent | e7dc0f213e99f9afcdc724780068c32a175deea6 (diff) | |
I am very proud of myself. I managed to write a working _start for
x86 entirely in C -- no asm required. muahahahaha!
-Erik
| -rw-r--r-- | libc/sysdeps/linux/i386/Makefile | 12 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/crt0.c | 40 |
2 files changed, 52 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile index f55b91355..bb7cb6e85 100644 --- a/libc/sysdeps/linux/i386/Makefile +++ b/libc/sysdeps/linux/i386/Makefile @@ -20,12 +20,20 @@ # other sundry sources. Files within this library are copyright by their # respective copyright holders. +USE_CRT0_C=true + TOPDIR=../../../../ include $(TOPDIR)Rules.mak ASFLAGS=$(CFLAGS) +ifeq ($(USE_CRT0_C),true) +CRT0=crt0.c +CRT0_OBJ=$(patsubst %.c,%.o, $(CRT0)) +else CRT0=crt0.S CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0)) +endif + SSRC=__longjmp.S setjmp.S vfork.S #_start.S #clone.S ifeq ($(UNIFIED_SYSCALL),true) @@ -47,7 +55,11 @@ ar-target: $(OBJS) $(CRT0_OBJ) $(AR) $(ARFLAGS) $(LIBC) $(OBJS) cp $(CRT0_OBJ) $(TOPDIR)libc/$(CRT0_OBJ) +ifeq ($(USE_CRT0_C),true) +$(CRT0_OBJ): %.o : %.c +else $(CRT0_OBJ): %.o : %.S +endif $(CC) $(CFLAGS) -c $< -o $@ $(STRIPTOOL) -x -R .note -R .comment $*.o diff --git a/libc/sysdeps/linux/i386/crt0.c b/libc/sysdeps/linux/i386/crt0.c new file mode 100644 index 000000000..c40224ca6 --- /dev/null +++ b/libc/sysdeps/linux/i386/crt0.c @@ -0,0 +1,40 @@ +/* + * uClibc/sysdeps/linux/i386/crt0.S + * Pull stuff off the stack and get uClibc moving. + * + * Copyright (C) 2001 by Lineo, inc. + * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> + * who is very pleased he managed to do this entirely in C code. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU Library General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License + * for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +extern void __uClibc_main(int argc,void *argv,void *envp); + +void _start(unsigned int first_arg) +{ + unsigned int argc; + char **argv, **envp; + unsigned long *stack; + + stack = (unsigned long*) &first_arg; + argc = *(stack - 1); + argv = (char **) stack; + envp = (char **)stack + argc + 1; + + __uClibc_main(argc, argv, envp); +} + |