* Copyright (c) 1993 Paul Kranenburg
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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 Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough 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.
* $Id: crt0.c,v 1.6 1993/11/09 04:26:11 paul Exp $
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "%W% (Erasmus) %G%";
#endif /* LIBC_SCCS and not lint */
#define N_GETMAGIC(x) ((x).a_magic)
#define N_BSSADDR(x) (N_DATADDR(x)+(x).a_data)
#define MAP_COPY MAP_PRIVATE
extern struct link_dynamic _DYNAMIC
;
static void __do_dynamic_link ();
#define LDSO "/usr/lib/ld.so"
#define LDSO "/usr/libexec/ld.so"
extern unsigned char etext
;
extern unsigned char eprol
asm ("eprol");
extern start() asm("start");
extern mcount() asm ("mcount");
char *__progname
= empty
;
* We need these system calls, but can't use library stubs
#define _exit(v) __syscall(SYS_exit, (v))
#define open(name, f, m) __syscall(SYS_open, (name), (f), (m))
#define close(fd) __syscall(SYS_close, (fd))
#define read(fd, s, n) __syscall(SYS_read, (fd), (s), (n))
#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
#define dup(fd) __syscall(SYS_dup, (fd))
#define dup2(fd, fdnew) __syscall(SYS_dup2, (fd), (fdnew))
#define mmap(addr, len, prot, flags, fd, off) \
__syscall(SYS_mmap, (addr), (len), (prot), _MAP_NEW|(flags), (fd), (off))
#define mmap(addr, len, prot, flags, fd, off) \
__syscall(SYS_mmap, (addr), (len), (prot), (flags), (fd), (off))
write(2, str, sizeof(str)), \
/* Set up `argc', `argv', and `envp' into local registers (from GNU Emacs). */
asm (" ld [%sp + 64], %l0"); /* argc */
asm (" add %sp, 68, %l1"); /* argv */
asm (" sll %l0, 2, %l2"); /**/
asm (" add %l2, 4, %l2"); /* envp = argv + (argc << 2) + 4 */
asm (" add %l1, %l2, %l2"); /**/
asm (" sethi %hi(_environ), %l3");
asm (" st %l2, [%l3+%lo(_environ)]"); /* *environ = l2 */
/* Finish diddling with stack. */
asm (" andn %sp, 7, %sp");
asm (" sub %sp, 24, %sp");
/* Resolve symbols in dynamic libraries */
asm (" call ___do_dynamic_link");
/* From here, all symbols should have been resolved, so we can use libc */
asm (" call ___do_mcrt");
/* Stay Sun compatible (currently (SunOS 4.1.2) does nothing on sun4) */
asm (" call start_float");
/* Move `argc', `argv', and `envp' from locals to parameters for `main'. */
asm ("__callmain:"); /* Defined for the benefit of debuggers */
extern unsigned char eprol
, etext
;
monstartup(&eprol
, &etext
);
char *kargv
[1]; /* size depends on kargc */
char kargstr
[1]; /* size varies */
char kenvstr
[1]; /* size varies */
* ALL REGISTER VARIABLES!!!
register struct kframe
*kfp
;
/* just above the saved frame pointer */
asm ("lea 4(%%ebp), %0" : "=r" (kfp
) );
for (argv
= targv
= &kfp
->kargv
[0]; *targv
++; /* void */)
if (targv
>= (char **)(*argv
))
/* ld(1) convention: if DYNAMIC = 0 then statically linked */
monstartup(&eprol
, &etext
);
if ((__progname
= _strrchr(argv
[0], '/')) == NULL
)
asm ("__callmain:"); /* Defined for the benefit of debuggers */
exit(main(kfp
->kargc
, argv
, environ
));
/* Provision for alternate ld.so - security risk! */
if (!(ldso
= _getenv("LDSO")))
crt
.crt_ldfd
= open(ldso
, 0, 0);
if (crt
.crt_ldfd
== -1) {
/* Read LDSO exec header */
if (read(crt
.crt_ldfd
, &hdr
, sizeof hdr
) < sizeof hdr
) {
_FATAL("Failure reading ld.so\n");
if ((N_GETMAGIC_NET(hdr
) != ZMAGIC
) && (N_GETMAGIC(hdr
) != QMAGIC
)) {
_FATAL("Bad magic: ld.so\n");
/* Get bucket of zeroes */
crt
.crt_dzfd
= open("/dev/zero", 0, 0);
if (crt
.crt_dzfd
== -1) {
_FATAL("No /dev/zero\n");
#if defined(sun) && defined(DUPZFD)
if ((dupzfd
= dup(crt
.crt_dzfd
)) < 0) {
_FATAL("Cannot dup /dev/zero\n");
crt
.crt_ba
= mmap(0, hdr
.a_text
,
crt
.crt_ldfd
, N_TXTOFF(hdr
));
_FATAL("Cannot map ld.so\n");
* This is gross, ld.so is a ZMAGIC a.out, but has `sizeof(hdr)' for
* an entry point and not at PAGSIZ as the N_*ADDR macros assume.
#define N_DATADDR(x) ((x).a_text)
#define N_BSSADDR(x) ((x).a_text + (x).a_data)
/* Map in data segment of ld.so writable */
if (mmap(crt
.crt_ba
+N_DATADDR(hdr
), hdr
.a_data
,
MAP_FIXED
|MAP_FILE
|MAP_COPY
,
crt
.crt_ldfd
, N_DATOFF(hdr
)) == -1) {
_FATAL("Cannot map ld.so\n");
/* Map bss segment of ld.so zero */
if (hdr
.a_bss
&& mmap(crt
.crt_ba
+N_BSSADDR(hdr
), hdr
.a_bss
,
MAP_FIXED
|MAP_ANON
|MAP_COPY
,
crt
.crt_dzfd
, 0) == -1) {
_FATAL("Cannot map ld.so\n");
crt
.crt_bp
= (caddr_t
)_callmain
;
#if defined(sparc) && defined(SUN_COMPAT)
/* Call Sun's ld.so entry point: version 1, offset crt */
__call(CRT_VERSION_SUN
, &crt
, crt
.crt_ba
+ sizeof hdr
);
entry
= (void (*)())(crt
.crt_ba
+ sizeof hdr
);
(*entry
)(CRT_VERSION_SUN
, &crt
);
(*entry
)(CRT_VERSION_BSD
, &crt
);
#if defined(sun) && defined(DUPZFD)
if (dup2(dupzfd
, crt
.crt_dzfd
) < 0) {
_FATAL("Cannot dup2 /dev/zero\n");
* adjust the C generated pointer to the crt struct to the
* likings of ld.so, which is an offset relative to its %fp
asm("sub %o1, %sp, %o1"); /* adjust parameter */
asm("sub %o1, %sp, %o1");
/*NOTREACHED, control is transferred directly to our caller */
return (*(unsigned char *)s1
- *(unsigned char *)--s2
);
for (C
= name
, len
= 0; *C
&& *C
!= '='; ++C
, ++len
);
for (P
= environ
; *P
; ++P
)
if (!_strncmp(*P
, name
, len
))
if (*(C
= *P
+ len
) == '=') {
asm("bgeu Lsyscallx"); /* good result ? */
asm("mov -0x1, %o0"); /* Note: no `errno' */
for (save
= NULL
;; ++p
) {