glibc/sysdeps/alpha/stxncpy.S
Ulrich Drepper cccda09fd7 update from main archive 961005
Sun Oct  6 02:05:52 1996  Ulrich Drepper  <drepper@cygnus.com>

	* posix/getopt.c: Add casts to prevent warnings.
	* posix/regex.c: Likewise.

	* math/Makefile (long-m-routines, long-m-yes): Define to correct
	values to make `long double' functions available.
	(distribute): Add $(long-m-yes:=.c).

	* sysdeps/libm-i387/s_ceill.S: Correct loading of return value.
	Use long double instruction.

	* sysdeps/libm-ieee754/e_atanhl.c (huge): Correct constant.
	* sysdeps/libm-ieee754/e_asinhl.c: Likewise.
	* sysdeps/libm-ieee754/s_tanhl.c: Likewise.

	* sysdeps/libm-ieee754/e_coshl.c: New file.

	* sysdeps/libm-ieee754/s_asinh.c [!NO_LONG_DOUBLE]: Define names
	for `long double' version as alias.
	* sysdeps/libm-ieee754/s_atan.c: Likewise.
	* sysdeps/libm-ieee754/s_cbrt.c: Likewise.
	* sysdeps/libm-ieee754/s_ceil.c: Likewise.
	* sysdeps/libm-ieee754/s_copysign.c: Likewise.
	* sysdeps/libm-ieee754/s_cos.c: Likewise.
	* sysdeps/libm-ieee754/s_erf.c: Likewise.
	* sysdeps/libm-ieee754/s_expm1.c: Likewise.
	* sysdeps/libm-ieee754/s_fabs.c: Likewise.
	* sysdeps/libm-ieee754/s_finite.c: Likewise.
	* sysdeps/libm-ieee754/s_floor.c: Likewise.
	* sysdeps/libm-ieee754/s_frexp.c: Likewise.
	* sysdeps/libm-ieee754/s_ilogb.c: Likewise.
	* sysdeps/libm-ieee754/s_ldexp.c: Likewise.
	* sysdeps/libm-ieee754/s_log1p.c: Likewise.
	* sysdeps/libm-ieee754/s_logb.c: Likewise.
	* sysdeps/libm-ieee754/s_modf.c: Likewise.
	* sysdeps/libm-ieee754/s_nextafter.c: Likewise.
	* sysdeps/libm-ieee754/s_rint.c: Likewise.
	* sysdeps/libm-ieee754/s_scalbn.c: Likewise.
	* sysdeps/libm-ieee754/s_significand.c: Likewise.
	* sysdeps/libm-ieee754/s_sin.c: Likewise.
	* sysdeps/libm-ieee754/s_tan.c: Likewise.
	* sysdeps/libm-ieee754/s_tanh.c: Likewise.
	* sysdeps/libm-ieee754/w_acos.c: Likewise.
	* sysdeps/libm-ieee754/w_acosh.c: Likewise.
	* sysdeps/libm-ieee754/w_sin.c: Likewise.
	* sysdeps/libm-ieee754/w_atan2.c: Likewise.
	* sysdeps/libm-ieee754/w_atanh.c: Likewise.
	* sysdeps/libm-ieee754/w_cabs.c: Likewise.
	* sysdeps/libm-ieee754/w_cosh.c: Likewise.
	* sysdeps/libm-ieee754/w_drem.c: Likewise.
	* sysdeps/libm-ieee754/w_exp.c: Likewise.
	* sysdeps/libm-ieee754/w_fmod.c: Likewise.
	* sysdeps/libm-ieee754/w_gamma.c: Likewise.
	* sysdeps/libm-ieee754/w_gamma_r.c: Likewise.
	* sysdeps/libm-ieee754/w_hypot.c: Likewise.
	* sysdeps/libm-ieee754/w_j0.c: Likewise.
	* sysdeps/libm-ieee754/w_j1.c: Likewise.
	* sysdeps/libm-ieee754/w_jn.c: Likewise.
	* sysdeps/libm-ieee754/w_lgamma.c: Likewise.
	* sysdeps/libm-ieee754/w_lgamma_r.c: Likewise.
	* sysdeps/libm-ieee754/w_log.c: Likewise.
	* sysdeps/libm-ieee754/w_log10.c: Likewise.
	* sysdeps/libm-ieee754/w_pow.c: Likewise.
	* sysdeps/libm-ieee754/w_remainder.c: Likewise.
	* sysdeps/libm-ieee754/w_scalb.c: Likewise.
	* sysdeps/libm-ieee754/w_sinh.c: Likewise.
	* sysdeps/libm-ieee754/w_sqrt.c: Likewise.

	Stub files for missing long double math functions.
	* sysdeps/stub/e_acoshl.c: New file.
	* sysdeps/stub/e_hypotl.c: New file.
	* sysdeps/stub/e_j0l.c: New file.
	* sysdeps/stub/e_j1l.c: New file.
	* sysdeps/stub/e_jnl.c: New file.
	* sysdeps/stub/e_lgammal_r.c: New file.
	* sysdeps/stub/e_powl.c: New file.
	* sysdeps/stub/e_rem_pio2l.c: New file.
	* sysdeps/stub/e_sinhl.c: New file.
	* sysdeps/stub/k_cosl.c: New file.
	* sysdeps/stub/k_rem_pio2l.c: New file.
	* sysdeps/stub/k_sinl.c: New file.
	* sysdeps/stub/k_tanl.c: New file.
	* sysdeps/stub/s_erfl.c: New file.
	* sysdeps/stub/s_expm1l.c: New file.

	* sysdeps/i386/__longjmp.S: Use PSEUDO_END macro to provide
	.size directive.
	* sysdeps/i386/bsd-_setjmp.S: Likewise.
	* sysdeps/i386/bsd-setjmp.S: Likewise.
	* sysdeps/i386/memchr.S: Likewise.
	* sysdeps/i386/memcmp.S: Likewise.
	* sysdeps/i386/setjmp.S: Likewise.
	* sysdeps/i386/stpcpy.S: Likewise.
	* sysdeps/i386/stpncpy.S: Likewise.
	* sysdeps/i386/strchr.S: Likewise.
	* sysdeps/i386/strcspn.S: Likewise.
	* sysdeps/i386/strpbrk.S: Likewise.
	* sysdeps/i386/strrchr.S: Likewise.
	* sysdeps/i386/strspn.S: Likewise.
	* sysdeps/i386/strtok.S: Likewise.
	* sysdeps/i386/i486/strcat.S: Likewise.
	* sysdeps/i386/i486/strlen.S: Likewise.
	* sysdeps/i386/i586/memset.S: Likewise.
	* sysdeps/i386/i586/strchr.S: Likewise.
	* sysdeps/i386/i586/strlen.S: Likewise.
	* sysdeps/libm-i387/e_acos.S: Likewise.
	* sysdeps/libm-i387/e_acosl.S: Likewise.
	* sysdeps/libm-i387/e_asin.S: Likewise.
	* sysdeps/libm-i387/e_asinl.S: Likewise.
	* sysdeps/libm-i387/e_atan2.S: Likewise.
	* sysdeps/libm-i387/e_atan2l.S: Likewise.
	* sysdeps/libm-i387/e_exp.S: Likewise.
	* sysdeps/libm-i387/e_expl.S: Likewise.
	* sysdeps/libm-i387/e_fmod.S: Likewise.
	* sysdeps/libm-i387/e_fmodl.S: Likewise.
	* sysdeps/libm-i387/e_log.S: Likewise.
	* sysdeps/libm-i387/e_log10.S: Likewise.
	* sysdeps/libm-i387/e_log10l.S: Likewise.
	* sysdeps/libm-i387/e_logl.S: Likewise.
	* sysdeps/libm-i387/e_remainder.S: Likewise.
	* sysdeps/libm-i387/e_remainderf.S: Likewise.
	* sysdeps/libm-i387/e_remainderl.S: Likewise.
	* sysdeps/libm-i387/e_scalb.S: Likewise.
	* sysdeps/libm-i387/e_scalbl.S: Likewise.
	* sysdeps/libm-i387/e_sqrt.S: Likewise.
	* sysdeps/libm-i387/e_sqrtf.S: Likewise.
	* sysdeps/libm-i387/e_sqrtl.S: Likewise.
	* sysdeps/libm-i387/s_atan.S: Likewise.
	* sysdeps/libm-i387/s_atanf.S: Likewise.
	* sysdeps/libm-i387/s_atanl.S: Likewise.
	* sysdeps/libm-i387/s_ceil.S: Likewise.
	* sysdeps/libm-i387/s_ceilf.S: Likewise.
	* sysdeps/libm-i387/s_ceill.S: Likewise.
	* sysdeps/libm-i387/s_copysign.S: Likewise.
	* sysdeps/libm-i387/s_copysignf.S: Likewise.
	* sysdeps/libm-i387/s_copysignl.S: Likewise.
	* sysdeps/libm-i387/s_cos.S: Likewise.
	* sysdeps/libm-i387/s_cosf.S: Likewise.
	* sysdeps/libm-i387/s_cosl.S: Likewise.
	* sysdeps/libm-i387/s_finite.S: Likewise.
	* sysdeps/libm-i387/s_finitef.S: Likewise.
	* sysdeps/libm-i387/s_finitel.S: Likewise.
	* sysdeps/libm-i387/s_floor.S: Likewise.
	* sysdeps/libm-i387/s_floorf.S: Likewise.
	* sysdeps/libm-i387/s_floorl.S: Likewise.
	* sysdeps/libm-i387/s_ilogb.S: Likewise.
	* sysdeps/libm-i387/s_ilogbf.S: Likewise.
	* sysdeps/libm-i387/s_ilogbl.S: Likewise.
	* sysdeps/libm-i387/s_log1p.S: Likewise.
	* sysdeps/libm-i387/s_log1pf.S: Likewise.
	* sysdeps/libm-i387/s_log1pl.S: Likewise.
	* sysdeps/libm-i387/s_logb.S: Likewise.
	* sysdeps/libm-i387/s_logbf.S: Likewise.
	* sysdeps/libm-i387/s_logbl.S: Likewise.
	* sysdeps/libm-i387/s_rint.S: Likewise.
	* sysdeps/libm-i387/s_rintf.S: Likewise.
	* sysdeps/libm-i387/s_rintl.S: Likewise.
	* sysdeps/libm-i387/s_scalbn.S: Likewise.
	* sysdeps/libm-i387/s_scalbnf.S: Likewise.
	* sysdeps/libm-i387/s_scalbnl.S: Likewise.
	* sysdeps/libm-i387/s_significand.S: Likewise.
	* sysdeps/libm-i387/s_significandf.S: Likewise.
	* sysdeps/libm-i387/s_significandl.S: Likewise.
	* sysdeps/libm-i387/s_sin.S: Likewise.
	* sysdeps/libm-i387/s_sinf.S: Likewise.
	* sysdeps/libm-i387/s_sinl.S: Likewise.
	* sysdeps/libm-i387/s_tan.S: Likewise.
	* sysdeps/libm-i387/s_tanf.S: Likewise.
	* sysdeps/libm-i387/s_tanl.S: Likewise.

	* sysdeps/unix/sysv/linux/i386/clone.S: Add .size directive.
	* sysdeps/unix/sysv/linux/i386/mmap.S. Likewise.
	* sysdeps/unix/sysv/linux/i386/socket.S. Likewise.
	* sysdeps/unix/sysv/linux/i386/sysdep.S. More compact .size line.

	* sysdeps/i386/sysdep.h (ASM_SIZE_DIRECTIVE): New macro.  Used
	to provide .size directive on ELF systems.

	* sysdeps/unix/sysv/linux/i386/profil-counter.h: Include
	<sigcontext.h> and rename parameter type to sigcontext.
	* sysdeps/unix/sysv/linux/i386/sigcontext.h New file.

	* sysdeps/unix/sysv/linux/i386/syscall.S: From Linux 2.1 on
	negative values might occur as positive results.  Test against
	-125 to decide for error or not.
	* sysdeps/unix/sysv/linux/i386/sysdep.h: Likewise for system calls.

Thu Oct  3 21:07:58 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* elf/dl-open.c: Use _DYNAMIC instead of _dl_start to decide
	whether this is a statically linked program.  The latter is now
	always defined.

Fri Oct  4 02:08:10 1996  Bang Jun-Young  <bangjy@nownuri.nowcom.co.kr>

	* po/ko.po: Update.

Fri Oct  4 02:07:46 1996  Michel Robitaille  <robitail@IRO.UMontreal.CA>

	* po/fr.po: New file.

Fri Oct  4 05:04:52 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/i386/sigcontext.h: New file.

	Add support for MD5 crypt replacement.
	* Makefile (subdirs): Add crypt.
	* shlib-versions: Add entry for libcrypt.
	* crypt/md5-crypt.c: New file.
	* crypt/md5.c: New file.
	* crypt/md5.h: New file.
	* sysdeps/generic/crypt-entry.c: New file.
	* sysdeps/generic/crypt.h: New file.

Thu Oct  3 20:53:23 1996  Andreas Jaeger  <aj@arthur.pfalz.de>

	* dirent/tst-seekdir.c: Provide correct prototypes.
	* io/test-utime.c: Likewise.
	* malloc/mallocbug.c: Likewise.
	* posix/testfnm.c: Likewise.
	* stdio-common/xbug.c: Likewise.
	* sysdeps/posix/cuserid.c: Likewise.

Wed Oct  2 13:33:48 1996  Richard Henderson  <rth@tamu.edu>

	Provide optimized string functions for Alpha processors.
	* sysdeps/alpha/bzero.S: New file.
	* sysdeps/alpha/memset.S: New file.
	* sysdeps/alpha/stpcpy.S: New file.
	* sysdeps/alpha/stpncpy.S: New file.
	* sysdeps/alpha/strcat.S: New file.
	* sysdeps/alpha/strchr.S: New file.
	* sysdeps/alpha/strcpy.S: New file.
	* sysdeps/alpha/strncat.S: New file.
	* sysdeps/alpha/strncpy.S: New file.
	* sysdeps/alpha/strrchr.S: New file.
	* sysdeps/alpha/stxcpy.S: New file.
	* sysdeps/alpha/stxncpy.S: New file.

	* sysdeps/alpha/Makefile [$(sudir)==string]: Add stxcpy and
	stxncpy to sysdep_routines.
	Minor correction.

Wed Oct  2 13:41:48 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/generic/strtok.c: Don't set stored pointer to NULL when
 	notheing is found.  This guarantees all subsequent calls behave
 	the same.
	* sysdeps/generic/strtok_r.c: Likewise.

Mon Sep 30 22:27:36 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/posix/tempname.c (__stdio_gen_tempname): Don't declare
	`i' as const.

Mon Sep 30 22:38:29 1996  Richard Henderson  <rth@tamu.edu>

	* sysdeps/generic/strtok.c: When we hit EOS, don't set olds to
	NULL immediately; we're going to get called one more time.
	* sysdeps/generic/strtok_r.c: Likewise.

Tue Oct  1 09:12:21 1996  Ulrich Drepper  <drepper@cygnus.com>

	* locale/programs/ld-time.c: Always write some bytes at the end of
 	the file even if no `era's are specified.

	* stdio-common/tmpname.c (tmpbuf): Don't define as array of
 	pointers.

Tue Oct  1 01:43:11 1996  Ulrich Drepper  <drepper@cygnus.com>

	* libio/iofclose.c: Move unlocking to right position.

Mon Sep 30 03:08:34 1996  Richard Henderson  <rth@tamu.edu>

	* misc/Makefile: Kill force-wrapper.
	* misc/force-wrapper.c: Delete.

	* elf/eval.c: Add <string.h>.

	* gmon/sys/gmon_out.h: Nonsense like `char foo[sizeof(char*)]'
	followed by `bcopy(&ptr, &foo, sizeof(foo))' helps portability
	and binary compatibility not at all.  Better to do `char *foo'
	followed by `foo = ptr' as it is much cleaner.
	(struct gmon_hdr): Fix version.
	(struct gmon_hist_hdr): Fix low_pc, high_pc, hist_size, prof_rate.
	(struct gmon_cg_arc_record): Fix from_pc, self_pc, count.
	* gmon/gmon.c: De-ansidecl-ify.
	(write_hist): De-bcopy-fy.
	(write_call_graph): Likewise.

	* gmon/mcount.c: Assume _MCOUNT_DECL does the entire declaration.
	* sysdeps/alpha/machine-gmon.h: Update _MCOUNT_DECL.
	* sysdeps/generic/machine-gmon.h: Likewise.

	* resolv/netdb.h: Add __set_h_errno to mimic __set_errno.
	* nss/getXXent_r.c: Use __set_h_errno to set h_errno in all funcs.
	* nss/nss_dns/dns-network.c: Likewise.
	* resolv/getunamaddr.c: Likewise.  Also use __set_errno where needed.
	* resolv/getnetnamadr.c: Likewise.
	* resolv/res_debug.c: Likewise.
	* resolv/res_mkquery.c: Likewise.
	* resolv/res_query.c: Likewise.

	* libio/clearerr_u.c: It's not necessary to define __ protected
	function so don't do it.
	* libio/feof_u.c, libio/ferror_u.c, libio/fputc_u.c,
	  libio/getc_u.c, libio/getchar_u.c, libio/iofflush_u.c: Likewise.

	* libio/fgetc.c: Avoid a warning by casting _IO_funlockfile for
	the cleanup registrar.
	* libio/fputc.c, libio/freopen.c, libio/fseek.c, libio/getc.c,
	  libio/getchar.c, libio/iofclose.c, libio/iofflush.c,
	  libio/iofgetpos.c, libio/iofgets.c, libio/iofputs.c,
	  libio/iofread.c, libio/iofsetpos.c, libio/ioftell.c,
	  libio/iofwrite.c, libio/iogetdelim.c, libio/iogets.c,
	  libio/ioputs.c, libio/iosetbuffer.c, libio/iosetvbuf.c,
	  libio/ioungetc.c, libio/putc.c, libio/putchar.c, libio/rewind.c:
	Likewise.

	* locale/programs/ld-ctype.c: Include <alloca.h>.

	* login/login_tty.c: Get login_tty prototype from <utmp.h>.

	* posix/sys/types.h: Change #defines to typedefs.  This is looking
	forward to more comprehensive namespace cleanups for C++.
	* posix/unistd.h: Likewise for ssize_t.

	* pwd/getpw.c: Prototype and rename getpw -> __getpw and add a
	weak alias.

	* resolv/base64.c: Don't do `for (NULL; ...)' as it causes
	`statement with no effect' warnings.
	* resolv/inet_neta.c: Include <string.h> for strlen.

	* stdio-common/getline.c: Undef ssize_t before libio redefinition.
	* stdio-common/tstgetln.c: Same.  De-ansidecl-ify.
	* stdio-common/vfprintf.c: Same for va_list.
	* stdio-common/vfscanf.c: Same.
	* stdio-common/reg-printf.c: Prototype the __ function.
	* stdio-common/scanf.c [USE_IN_LIBIO]: Include <libioP.h> for
	_IO_vscanf declaration.

	* string/tester.c: Tsk, tsk.  Don't cast pointers to int,
	but to unsigned long for the health of 64-bit systems.

	* sunrpc/svc_udp.c: Define MAX only if we don't have it yet.
	Many system's <sys/param.h> pulls this in.

	* sysdeps/generic/dl-cache.c: Kill the bottom half of the
	patch doubled file.

	* sysdeps/generic/pty.c (forkpty): Get login_tty decl from <utmp.h>
	instead of defining it locally.

	* sysdeps/posix/sigvec.c: Prototype wrapper_handler and convert_mask.
	* sysdeps/stub/chflags.c: Prototype chflags.
	* sysdeps/stub/fchflags.c: Prototype fchflags.
	* sysdeps/stub/sstk.c: Prototype sstk.

	* sysdeps/unix/alpha/sysdep.S:  Add strong alias from errno
	variable to __errno.  Update __syscall_error to store to both
	the global and per-thread variables.

	* sysdeps/unix/sysv/linux/init-first.c: Change include of
	init-first.h from "" to <> as "" does not search the include path.
	Prototype _dl_start.

Sun Sep 29 14:41:17 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/Makefile ($(common-objpfx)s-proto.d): Make it a
	pattern rule to get the right stem.

Sat Sep 28 01:30:06 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* Makefile ($(objpfx)version-info.h): Fix typo in previous change.

Sat Sep 28 00:44:38 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/posix/euidaccess.c (__set_errno): Fix typo.

Sat Sep 28 00:40:38 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* malloc/free.c (_free_internal): Don't call free recursively, use
	the internal functions instead.

Sat Sep 28 00:23:20 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/posix/tempname.c (__stdio_gen_tempname) [USE_IN_LIBIO &&
	_IO_MTSAFE_IO]: Allocate and initialize the file lock.

Fri Sep 27 23:58:17 1996  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* catgets/gencat.c (main): Print version information on stdout,
	not stderr.
	* db/makedb.c: Likewise.
	* locale/programs/locale.c: Likewise.
	* locale/programs/localedef.c: Likewise.

Mon Sep 30 00:14:26 1996  Ulrich Drepper  <drepper@cygnus.com>

	Add implementation of netgroup.
	* inet/Makefile (distributes): Add netgroup.h.
	(routines): Add getnetgrent.c and getnetgrent_r.c.
	* inet/getnetgrent.c: New file.
	* inet/getnetgrent_r.c: New file.
	* inet/netgroup.h: New file.
	* netgroup.h: New file.
	* nsswitch.h: New file.
	* nss/Makefile (databases): Add getgrp.
	* nss/databases.def: Add netgroup.
	* nss/db-Makefile: Add rules for netgroup.
	* nss/netgrp-lookup.c: New file.
	* nss/nss.h: Add new status value NSS_STATUS_RETURN which will
	always return without a check of the transition table.
	* nss/nsswitch.h (struct service_user): Extend actions array to
	five elements.
	* nss/nsswitch.c (__nss_next): Allow NSS_STATUS_RETURN as legal
	status value.
	(nss_parse_service_list): Initialize action for NSS_STATUS_RETURN
	to NSS_ACTION_RETURN.
	* nss/nss_db/db-netgrp.c: New file.
	* nss/nss_files/files-netgrp.c: New file.
	* nss/nsswitch.conf: Add entry for netgroup.
	* resolv/netdb.h: Add prototypes for netgroup functions.

	* nss/nss_db/db-XXX.c: Use `enum nss_status' type when status
	value is used.

Sun Sep 29 12:55:58 1996  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/syscalls.list: Change funciton name for
 	_llseek to _llseek (not llseek).
	Reported by Matthias Urlichs <smurf@smurf.noris.de>.

Sun Sep 29 05:34:32 1996  Ulrich Drepper  <drepper@cygnus.com>

	* inet/rcmd.c: Remove definition of MIN.

Sat Sep 28 14:22:51 1996  Ulrich Drepper  <drepper@cygnus.com>

	* dirent/readdir_r.c: Removed.  We indeed need a real implementation.
	* sysdeps/unix/readdir_r.c: New file.
	* sysdeps/unix/readdir.c: Remove check for correct parameter
	values.  Let them simply die.
	* manual/filesys.texi: Document readdir_r.

	* sysdeps/gnu/errlist.awk: Define _sys_errlist as `const char* const'.
	Proposed by Per Abrahamsen <abraham@dina.kvl.dk>.
1996-10-06 02:05:11 +00:00

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ArmAsm

/* Copyright (C) 1996 Free Software Foundation, Inc.
Contributed by Richard Henderson (rth@tamu.edu)
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. */
/* Copy no more than COUNT bytes of the null-terminated string from
SRC to DST.
This is an internal routine used by strncpy, stpncpy, and strncat.
As such, it uses special linkage conventions to make implementation
of these public functions more efficient.
On input:
t9 = return address
a0 = DST
a1 = SRC
a2 = COUNT
Furthermore, COUNT may not be zero.
On output:
t0 = last word written
t8 = bitmask (with one bit set) indicating the last byte written
t10 = bitmask (with one bit set) indicating the byte position of
the end of the range specified by COUNT
a0 = unaligned address of the last *word* written
a2 = the number of full words left in COUNT
Furthermore, v0, a3-a5, t11, and t12 are untouched.
*/
/* This is generally scheduled for the EV5, but should still be pretty
good for the EV4 too. */
#include <sysdep.h>
.set noat
.set noreorder
.text
/* There is a problem with either gdb (as of 4.16) or gas (as of 2.7) that
doesn't like putting the entry point for a procedure somewhere in the
middle of the procedure descriptor. Work around this by putting the
aligned copy in its own procedure descriptor */
.ent stxncpy_aligned
.align 3
stxncpy_aligned:
.frame sp, 0, t9, 0
.prologue 0
/* On entry to this basic block:
t0 == the first destination word for masking back in
t1 == the first source word. */
/* Create the 1st output word and detect 0's in the 1st input word. */
lda t2, -1 # e1 : build a mask against false zero
mskqh t2, a1, t2 # e0 : detection in the src word
mskqh t1, a1, t3 # e0 :
ornot t1, t2, t2 # .. e1 :
mskql t0, a1, t0 # e0 : assemble the first output word
cmpbge zero, t2, t7 # .. e1 : bits set iff null found
or t0, t3, t0 # e0 :
beq a2, $a_eoc # .. e1 :
bne t7, $a_eos # .. e1 :
/* On entry to this basic block:
t0 == a source word not containing a null. */
$a_loop:
stq_u t0, 0(a0) # e0 :
addq a0, 8, a0 # .. e1 :
ldq_u t0, 0(a1) # e0 :
addq a1, 8, a1 # .. e1 :
subq a2, 1, a2 # e0 :
cmpbge zero, t0, t7 # .. e1 (stall)
beq a2, $a_eoc # e1 :
beq t7, $a_loop # e1 :
/* Take care of the final (partial) word store. At this point
the end-of-count bit is set in t7 iff it applies.
On entry to this basic block we have:
t0 == the source word containing the null
t7 == the cmpbge mask that found it. */
$a_eos:
negq t7, t8 # e0 : find low bit set
and t7, t8, t8 # e1 (stall)
/* For the sake of the cache, don't read a destination word
if we're not going to need it. */
and t8, 0x80, t6 # e0 :
bne t6, 1f # .. e1 (zdb)
/* We're doing a partial word store and so need to combine
our source and original destination words. */
ldq_u t1, 0(a0) # e0 :
subq t8, 1, t6 # .. e1 :
or t8, t6, t7 # e0 :
unop #
zapnot t0, t7, t0 # e0 : clear src bytes > null
zap t1, t7, t1 # .. e1 : clear dst bytes <= null
or t0, t1, t0 # e1 :
1: stq_u t0, 0(a0) # e0 :
ret (t9) # e1 :
/* Add the end-of-count bit to the eos detection bitmask. */
$a_eoc:
or t10, t7, t7
br $a_eos
.end stxncpy_aligned
.align 3
.ent __stxncpy
.globl __stxncpy
__stxncpy:
.frame sp, 0, t9, 0
.prologue 0
/* Are source and destination co-aligned? */
xor a0, a1, t1 # e0 :
and a0, 7, t0 # .. e1 : find dest misalignment
and t1, 7, t1 # e0 :
addq a2, t0, a2 # .. e1 : bias count by dest misalignment
subq a2, 1, a2 # e0 :
and a2, 7, t2 # e1 :
srl a2, 3, a2 # e0 : a2 = loop counter = (count - 1)/8
addq zero, 1, t10 # .. e1 :
sll t10, t2, t10 # e0 : t10 = bitmask of last count byte
bne t1, $unaligned # .. e1 :
/* We are co-aligned; take care of a partial first word. */
ldq_u t1, 0(a1) # e0 : load first src word
addq a1, 8, a1 # .. e1 :
beq t0, stxncpy_aligned # avoid loading dest word if not needed
ldq_u t0, 0(a0) # e0 :
br stxncpy_aligned # .. e1 :
/* The source and destination are not co-aligned. Align the destination
and cope. We have to be very careful about not reading too much and
causing a SEGV. */
.align 3
$u_head:
/* We know just enough now to be able to assemble the first
full source word. We can still find a zero at the end of it
that prevents us from outputting the whole thing.
On entry to this basic block:
t0 == the first dest word, unmasked
t1 == the shifted low bits of the first source word
t6 == bytemask that is -1 in dest word bytes */
ldq_u t2, 8(a1) # e0 : load second src word
addq a1, 8, a1 # .. e1 :
mskql t0, a0, t0 # e0 : mask trailing garbage in dst
extqh t2, a1, t4 # e0 :
or t1, t4, t1 # e1 : first aligned src word complete
mskqh t1, a0, t1 # e0 : mask leading garbage in src
or t0, t1, t0 # e0 : first output word complete
or t0, t6, t6 # e1 : mask original data for zero test
cmpbge zero, t6, t7 # e0 :
beq a2, $u_eocfin # .. e1 :
bne t7, $u_final # e1 :
lda t6, -1 # e1 : mask out the bits we have
mskql t6, a1, t6 # e0 : already seen
stq_u t0, 0(a0) # e0 : store first output word
or t6, t2, t2 # .. e1 :
cmpbge zero, t2, t7 # e0 : find nulls in second partial
addq a0, 8, a0 # .. e1 :
subq a2, 1, a2 # e0 :
bne t7, $u_late_head_exit # .. e1 :
/* Finally, we've got all the stupid leading edge cases taken care
of and we can set up to enter the main loop. */
extql t2, a1, t1 # e0 : position hi-bits of lo word
ldq_u t2, 8(a1) # .. e1 : read next high-order source word
addq a1, 8, a1 # e0 :
cmpbge zero, t2, t7 # e1 (stall)
beq a2, $u_eoc # e1 :
bne t7, $u_eos # e1 :
/* Unaligned copy main loop. In order to avoid reading too much,
the loop is structured to detect zeros in aligned source words.
This has, unfortunately, effectively pulled half of a loop
iteration out into the head and half into the tail, but it does
prevent nastiness from accumulating in the very thing we want
to run as fast as possible.
On entry to this basic block:
t1 == the shifted high-order bits from the previous source word
t2 == the unshifted current source word
We further know that t2 does not contain a null terminator. */
.align 3
$u_loop:
extqh t2, a1, t0 # e0 : extract high bits for current word
addq a1, 8, a1 # .. e1 :
extql t2, a1, t3 # e0 : extract low bits for next time
addq a0, 8, a0 # .. e1 :
or t0, t1, t0 # e0 : current dst word now complete
ldq_u t2, 0(a1) # .. e1 : load high word for next time
stq_u t0, -8(a0) # e0 : save the current word
mov t3, t1 # .. e1 :
subq a2, 1, a2 # e0 :
cmpbge zero, t2, t7 # .. e1 : test new word for eos
beq a2, $u_eoc # e1 :
beq t7, $u_loop # e1 :
/* We've found a zero somewhere in the source word we just read.
If it resides in the lower half, we have one (probably partial)
word to write out, and if it resides in the upper half, we
have one full and one partial word left to write out.
On entry to this basic block:
t1 == the shifted high-order bits from the previous source word
t2 == the unshifted current source word. */
$u_eos:
extqh t2, a1, t0 # e0 :
or t0, t1, t0 # e1 : first (partial) source word complete
cmpbge zero, t0, t7 # e0 : is the null in this first bit?
bne t7, $u_final # .. e1 (zdb)
stq_u t0, 0(a0) # e0 : the null was in the high-order bits
addq a0, 8, a0 # .. e1 :
subq a2, 1, a2 # e1 :
$u_late_head_exit:
extql t2, a1, t0 # .. e0 :
cmpbge zero, t0, t7 # e0 :
or t7, t10, t6 # e1 :
cmoveq a2, t6, t7 # e0 :
nop # .. e1 :
/* Take care of a final (probably partial) result word.
On entry to this basic block:
t0 == assembled source word
t7 == cmpbge mask that found the null. */
$u_final:
negq t7, t6 # e0 : isolate low bit set
and t6, t7, t8 # e1 :
and t8, 0x80, t6 # e0 : avoid dest word load if we can
bne t6, 1f # .. e1 (zdb)
ldq_u t1, 0(a0) # e0 :
subq t8, 1, t6 # .. e1 :
or t6, t8, t7 # e0 :
zapnot t0, t7, t0 # .. e1 : kill source bytes > null
zap t1, t7, t1 # e0 : kill dest bytes <= null
or t0, t1, t0 # e1 :
1: stq_u t0, 0(a0) # e0 :
ret (t9) # .. e1 :
$u_eoc: # end-of-count
extqh t2, a1, t0
or t0, t1, t0
cmpbge zero, t0, t7
$u_eocfin: # end-of-count, final word
or t10, t7, t7
br $u_final
/* Unaligned copy entry point. */
.align 3
$unaligned:
ldq_u t1, 0(a1) # e0 : load first source word
and a0, 7, t4 # .. e1 : find dest misalignment
and a1, 7, t5 # e0 : find src misalignment
/* Conditionally load the first destination word and a bytemask
with 0xff indicating that the destination byte is sacrosanct. */
mov zero, t0 # .. e1 :
mov zero, t6 # e0 :
beq t4, 1f # .. e1 :
ldq_u t0, 0(a0) # e0 :
lda t6, -1 # .. e1 :
mskql t6, a0, t6 # e0 :
1:
subq a1, t4, a1 # .. e1 : sub dest misalignment from src addr
/* If source misalignment is larger than dest misalignment, we need
extra startup checks to avoid SEGV. */
cmplt t4, t5, t8 # e1 :
extql t1, a1, t1 # .. e0 : shift src into place
lda t2, -1 # e0 : for creating masks later
beq t8, $u_head # e1 :
mskqh t2, t5, t2 # e0 : begin src byte validity mask
cmpbge zero, t1, t7 # .. e1 : is there a zero?
extql t2, a1, t2 # e0 :
or t7, t10, t6 # .. e1 : test for end-of-count too
cmpbge zero, t2, t3 # e0 :
cmoveq a2, t6, t7 # .. e1 :
andnot t7, t3, t7 # e0 :
beq t7, $u_head # .. e1 (zdb)
/* At this point we've found a zero in the first partial word of
the source. We need to isolate the valid source data and mask
it into the original destination data. (Incidentally, we know
that we'll need at least one byte of that original dest word.) */
ldq_u t0, 0(a0) # e0 :
negq t7, t6 # .. e1 : build bitmask of bytes <= zero
mskqh t1, t4, t1 # e0 :
and t6, t7, t8 # .. e1 :
subq t8, 1, t6 # e0 :
or t6, t8, t7 # e1 :
zapnot t2, t7, t2 # e0 : prepare source word; mirror changes
zapnot t1, t7, t1 # .. e1 : to source validity mask
andnot t0, t2, t0 # e0 : zero place for source to reside
or t0, t1, t0 # e1 : and put it there
stq_u t0, 0(a0) # e0 :
ret (t9) # .. e1 :
.end __stxncpy