mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-19 11:30:06 +00:00
a182affdd9
* Rules (others): Depend on $(extra-objs), $(install-lib), $(install-bin), $(install-sbin), in object directory. * Makeconfig (link-libc): Don't pass -rpath option with default path, since ld.so should use the same default. * Makerules (build-shlib): Likewise. * Makerules (make-target-directory): Use mkinstalldirs. * sysdeps/mach/i386/sysdep.h: Include unix/i386/sysdep.h to redefine ENTRY et al. * sysdeps/unix/sysv/linux/i386/sysdep.h (NO_UNDERSCORES, ENTRY): Macros removed. The code in unix/i386/sysdep.h should now suffice. * sysdeps/unix/i386/sysdep.h (ALIGNARG): New macro, defns for [HAVE_ELF] and not. (ENTRY): Use it in .align directive. (CALL_MCOUNT): New macro, empty unless [PROF]. (ENTRY): Do CALL_MCOUNT just after the label. * Makeconfig (CPPFLAGS-.po): New variable, use -DPROF so assembly code can call mcount. Tue Feb 20 23:05:16 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * time/private.h, time/zdump.c, time/zic.c: Updated verbatim from ADO; translation markings are now integrated in his distribution. * stdlib/strtod.c (round_and_return): Add missing (mp_limb) 1 cast. * po: New directory where `LANG.po' files for message translations will reside. * po/SYS_libc.pot: New file, template of message strings as in source. * MakeTAGS: New rules to build po/SYS_libc.pot automatically from the source using xgettext. * Makerules ($(..)po/%.pot): New rule. * manual/Makefile (../po/manual.pot): New target, make it empty. * sysdeps/unix/bsd/alarm.c: Moved to sysdeps/unix/alarm.c. * sysdeps/unix/bsd/nice.c: Moved to sysdeps/unix/nice.c. * sysdeps/unix/bsd/stime.c: Moved to sysdeps/unix/stime.c. * sysdeps/unix/bsd/time.c: Moved to sysdeps/unix/time.c. * sysdeps/unix/bsd/utime.c: Moved to sysdeps/unix/utime.c.
159 lines
5.4 KiB
C
159 lines
5.4 KiB
C
/* Copyright (C) 1992, 93, 95, 96 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
|
|
|
|
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. */
|
|
|
|
/* There is some commonality. */
|
|
#include <sysdeps/unix/i386/sysdep.h>
|
|
|
|
/* For Linux we can use the system call table in the header file
|
|
/usr/include/asm/unistd.h
|
|
of the kernel. But these symbols do not follow the SYS_* syntax
|
|
so we have to redefine the `SYS_ify' macro here. */
|
|
#undef SYS_ify
|
|
#ifdef __STDC__
|
|
# define SYS_ify(syscall_name) __NR_##syscall_name
|
|
#else
|
|
# define SYS_ify(syscall_name) __NR_/**/syscall_name
|
|
#endif
|
|
|
|
|
|
#ifdef ASSEMBLER
|
|
|
|
/* Linux uses a negative return value to indicate syscall errors, unlike
|
|
most Unices, which use the condition codes' carry flag. */
|
|
#undef PSEUDO
|
|
#define PSEUDO(name, syscall_name, args) \
|
|
.text; \
|
|
SYSCALL_ERROR_HANDLER \
|
|
ENTRY (name) \
|
|
DO_CALL (args, syscall_name); \
|
|
testl %eax, %eax; \
|
|
jl syscall_error;
|
|
|
|
#ifndef PIC
|
|
#define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */
|
|
#else
|
|
/* Store (- %eax) into errno through the GOT. */
|
|
#define SYSCALL_ERROR_HANDLER \
|
|
syscall_error: \
|
|
call 0f; \
|
|
0:popl %ecx; \
|
|
negl %eax; \
|
|
addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ecx; \
|
|
movl errno@GOT(%ecx), %ecx; \
|
|
movl %eax, (%ecx); \
|
|
movl $-1, %eax; \
|
|
ret;
|
|
#endif
|
|
|
|
/* Linux takes system call arguments in registers:
|
|
|
|
syscall number %eax call-clobbered
|
|
arg 1 %ebx call-saved
|
|
arg 2 %ecx call-clobbered
|
|
arg 3 %edx call-clobbered
|
|
arg 4 %esi call-saved
|
|
arg 5 %edi call-saved
|
|
|
|
The stack layout upon entering the function is:
|
|
|
|
20(%esp) Arg# 5
|
|
16(%esp) Arg# 4
|
|
12(%esp) Arg# 3
|
|
8(%esp) Arg# 2
|
|
4(%esp) Arg# 1
|
|
(%esp) Return address
|
|
|
|
(Of course a function with say 3 arguments does not have entries for
|
|
arguments 4 and 5.)
|
|
|
|
The following code tries hard to be optimal. A general assuption
|
|
(which is true according to the data books I have) is that
|
|
|
|
2 * xchg is more expensive than pushl + movl + popl
|
|
|
|
Beside this a neat trick is used. The calling conventions for Linux
|
|
tell that among the registers used for parameters %ecx and %edx need
|
|
not be saved. Beside this we may clobber this registers even when
|
|
they are not used for parameter passing.
|
|
|
|
As a result one can see below that we save the content of the %ebx
|
|
register in the %edx register when we have less than 3 arguments
|
|
(2 * movl is less expensive than pushl + popl).
|
|
|
|
Second unlike for the other registers we don't save the content of
|
|
%ecx and %edx when we have than 1 and 2 registers resp.
|
|
|
|
The code below might look a bit long but we have to take care for
|
|
the pipelined processors (i586 and up). Here the `pushl' and `popl'
|
|
instructions are marked as NP (not pairable) but the exception is
|
|
two consecutive of these instruction. This gives no penalty on
|
|
i386 and i486 processors though. */
|
|
|
|
#undef DO_CALL
|
|
#define DO_CALL(args, syscall_name) \
|
|
PUSHARGS_##args \
|
|
DOARGS_##args \
|
|
movl $SYS_ify (syscall_name), %eax; \
|
|
int $0x80 \
|
|
POPARGS_##args
|
|
|
|
#define PUSHARGS_0 /* No arguments to push. */
|
|
#define DOARGS_0 /* No arguments to frob. */
|
|
#define POPARGS_0 /* No arguments to pop. */
|
|
#define _PUSHARGS_0 /* No arguments to push. */
|
|
#define _DOARGS_0(n) /* No arguments to frob. */
|
|
#define _POPARGS_0 /* No arguments to pop. */
|
|
|
|
#define PUSHARGS_1 movl %ebx, %edx; PUSHARGS_0
|
|
#define DOARGS_1 _DOARGS_1 (4)
|
|
#define POPARGS_1 POPARGS_0; movl %edx, %ebx
|
|
#define _PUSHARGS_1 pushl %ebx; _PUSHARGS_0
|
|
#define _DOARGS_1(n) movl n(%esp), %ebx; _DOARGS_0(n-4)
|
|
#define _POPARGS_1 _POPARGS_0; popl %ebx
|
|
|
|
#define PUSHARGS_2 PUSHARGS_1
|
|
#define DOARGS_2 _DOARGS_2 (8)
|
|
#define POPARGS_2 POPARGS_1
|
|
#define _PUSHARGS_2 _PUSHARGS_1
|
|
#define _DOARGS_2(n) movl n(%esp), %ecx; _DOARGS_1 (n-4)
|
|
#define _POPARGS_2 _POPARGS_1
|
|
|
|
#define PUSHARGS_3 _PUSHARGS_2
|
|
#define DOARGS_3 _DOARGS_3 (16)
|
|
#define POPARGS_3 _POPARGS_3
|
|
#define _PUSHARGS_3 _PUSHARGS_2
|
|
#define _DOARGS_3(n) movl n(%esp), %edx; _DOARGS_2 (n-4)
|
|
#define _POPARGS_3 _POPARGS_2
|
|
|
|
#define PUSHARGS_4 _PUSHARGS_4
|
|
#define DOARGS_4 _DOARGS_4 (24)
|
|
#define POPARGS_4 _POPARGS_4
|
|
#define _PUSHARGS_4 pushl %esi; _PUSHARGS_3
|
|
#define _DOARGS_4(n) movl n(%esp), %esi; _DOARGS_3 (n-4)
|
|
#define _POPARGS_4 _POPARGS_3; popl %esi
|
|
|
|
#define PUSHARGS_5 _PUSHARGS_5
|
|
#define DOARGS_5 _DOARGS_5 (32)
|
|
#define POPARGS_5 _POPARGS_5
|
|
#define _PUSHARGS_5 pushl %edi; _PUSHARGS_4
|
|
#define _DOARGS_5(n) movl n(%esp), %edi; _DOARGS_4 (n-4)
|
|
#define _POPARGS_5 _POPARGS_4; popl %edi
|
|
|
|
#endif /* ASSEMBLER */
|