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authorRoland McGrath <roland@gnu.org>1996-06-21 21:01:27 +0000
committerRoland McGrath <roland@gnu.org>1996-06-21 21:01:27 +0000
commit4f54cdb1dd4b8929231f42e22b79a0d5c7600cba (patch)
tree7780b1282b5f0849339424c2c94fc278f2dd8767 /sysdeps/sparc/elf/start.S
parent51fbd1f60a5c43fc5bde04952bc88b5545a83d13 (diff)
* sysdeps/sparc/elf/start.S: New file.
* sysdeps/sparc/dl-machine.h: New file. * posix/fnmatch.c (fnmatch): Fix \*[*?]+ case to increment name ptr only for ?s, not for *s. Fix from Chet Ramey. Fixes thanks to Raja R Harinath <harinath@cs.umn.edu>: * sysdeps/unix/sysv/utmpbits.h: Define _HAVE_UT_{TYPE,ID,TV,HOST}. Use __{BEGIN,END}_DECLS. (_PATH_WTMP, _PATH_UTMP, _PATH_LASTLOG): New macros. * login/utmp.h (UTMP_FILE, UTMP_FILENAME, WTMP_FILE, WTMP_FILENAME): New macros, moved here from sysdeps/gnu/utmpbits.h. * sysdeps/generic/utmpbits.h (_HAVE_UT_HOST): Define it. * sysdeps/gnu/utmpbits.h (_HAVE_UT_HOST): Likewise. * login/logout.c: Use ut_host only #if _HAVE_UT_HOST. Use sizeof instead of UT_*SIZE. * login/logwtmp.c: Likewise. * misc/tsearch.c (tdelete): Define as weak alias to __tdelete. * version.c (banner): Add trailing newline.
Diffstat (limited to 'sysdeps/sparc/elf/start.S')
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1 files changed, 111 insertions, 0 deletions
diff --git a/sysdeps/sparc/elf/start.S b/sysdeps/sparc/elf/start.S
new file mode 100644
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+++ b/sysdeps/sparc/elf/start.S
@@ -0,0 +1,111 @@
+/* Startup code compliant to the ELF SPARC ABI.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library 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.
+
+The GNU C Library 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 the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* This is the canonical entry point, usually the first thing in the text
+ segment. The SVR4/SPARC ABI (NOTE: I don't actually have it) says that
+ when the entry point runs, most registers' values are unspecified,
+ except for:
+
+ %g1 Contains a function pointer to be registered with `atexit'.
+ This is how the dynamic linker arranges to have DT_FINI
+ functions called for shared libraries that have been loaded
+ before this code runs.
+
+ %sp The stack contains the arguments and environment:
+ 0(%sp) argc
+ 4(%sp) argv[0]
+ ...
+ (4*argc)(%sp) NULL
+ (4*(argc+1))(%sp) envp[0]
+ ...
+ NULL
+*/
+
+ .text
+ .align 16
+ .global _start
+_start:
+ /* %g1 contains the address of the shared library termination
+ function, which we will register with `atexit' to be called by
+ `exit'. I suspect that on some systems, and when statically
+ linked, this will not be set by anything to any function
+ pointer; hopefully it will be zero so we don't try to call
+ random pointers. */
+ orcc %g1, %g0, %o0 /* Move %g1 to %o0 while testing it. */
+ be nofini
+
+ /* In delay slot: clear the frame pointer. The ABI suggests this
+ be done, to mark the outermost frame obviously. */
+ clr %fp
+
+ /* Call atexit, argument was set in %o0 above. */
+ call atexit
+ nop
+nofini:
+
+ /* We will use some local variables in registers below. %g1 and
+ the %oN registers are call-clobbered, so we can't just use them. */
+#define ARGC %l0
+#define ARGV %l1
+#define ENVP %l2
+#define TMP %l3
+
+ /* Do essential libc initialization. In statically linked
+ programs under the GNU Hurd, this is what sets up the
+ arguments on the stack for the code below. */
+ call __libc_init_first
+ sethi %hi(_environ), TMP /* In delay slot: prepare to use &_environ. */
+
+ /* Extract the arguments and environment as encoded on the stack
+ and save them in local variables. */
+ ld [%sp + 64], ARGC /* After the register save area, ARGC. */
+ add %sp, 64+4, ARGV /* Next, the ARGV elements. */
+ /* After ARGC words that are the ARGV elements, and a zero word,
+ are the ENVP elements. Do ENVP = &ARGV[ARGC + 1]. */
+ add ARGC, 1, ENVP
+ sll ENVP, 2, ENVP
+ add ARGV, ENVP, ENVP
+ /* Store ENVP in the global variable `_environ'. */
+ st [TMP + %lo(_environ)], ENVP
+
+ /* Call `_init', which is the entry point to our own `.init'
+ section; and register with `atexit' to have `exit' call
+ `_fini', which is the entry point to our own `.fini' section. */
+ call _init
+ sethi %hi(_fini), TMP /* In delay slot of call. */
+ or TMP, %lo(_fini), %o0 /* Argument to atexit is &_fini. */
+ call atexit
+ nop
+
+ /* Call the user's main function, and exit with its value. */
+ mov ARGC, %o0
+ mov ARGV, %o1
+ call main
+ mov ENVP, %o2
+
+ call exit /* This should never return. */
+ unimp 0 /* Crash if somehow it does return. */
+
+/* Define a symbol for the first piece of initialized data. */
+ .data
+ .global __data_start
+__data_start:
+ .long 0
+ .weak data_start
+ data_start = __data_start