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Sat Jul 22 01:56:03 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

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* sysdeps/unix/i386/sysdep.h (JUMPTARGET): New macro; use name@PLT
 	#ifdef PIC.
	(PSEUDO): Use JUMPTARGET(syscall_error) in jump insn.
	* sysdeps/unix/i386/syscall.S: Use JUMPTARGET(syscall_error) in
 	jump insn.

	* sysdeps/unix/sysv/sysv4/linux/i386/sysdep.h: Rewritten.
	* sysdeps/unix/sysv/sysv4/linux/i386/syscall.S: New file.
	* sysdeps/unix/sysv/sysv4/linux/i386/socket.S: Include
 	<sys/socketcall.h>.  Save %ebx in call-clobbered %edx instead of
 	stack.  Use JUMPTARGET(syscall_error) in jump insn.

	* Makeconfig (+gccwarn): Add -Wbad-function-cast -Wconversion.

	* sysdeps/unix/i386/sysdep.h (ENTRY): Use ASM_GLOBAL_DIRECTIVE and
 	ASM_TYPE_DIRECTIVE.
	(ASM_TYPE_DIRECTIVE): New macro; defined using `.type' #ifdef ELF.

	* sysdeps/unix/sysv/sysv4/linux/i386/sysdep.S (__syscall_error): 
	Rewritten, #include'ing unix/i386/sysdep.S for most of the code.
	* sysdeps/unix/i386/sysdep.S [PIC]: Store into `errno' through the GOT.

	Fixes to help Linux, inspired by drepper's work:
	* configure.in (os=linux*): Use unix/sysv/sysv4 for $base_os,
 	instead of unix/sysv.
	* sysdeps/posix/utimes.c: New file.
	* sysdeps/generic/getdomain.c: New file.
	* sysdeps/i386/init-first.c: Removed gratuitous #include <hurd.h>.
	* sysdeps/generic/dl-sysdep.c: Include <unistd.h> and declare
 	externals _dl_argc, _dl_argc, and _environ.
	* sysdeps/unix/sysv/linux/{accept,connect,getsockname,rename,
	socketpair,waitpid,bind,getpeername,listen,setsid,wait4}.S: Moved
	to new directory sysdeps/unix/sysv/sysv4/linux.
	* sysdeps/unix/sysv/linux: Directory removed.
	* sysdeps/unix/sysv/i386/linux/{socket.S,sysdep.h,sysdep.S}: Moved
	to new directory sysdeps/unix/sysv/sysv4/linux/i386.
	* sysdeps/unix/sysv/linux/i386: Directory removed.
This commit is contained in:
Roland McGrath 1995-07-22 10:48:43 +00:00
parent 0bf9d0eb2b
commit 439d1d4560
27 changed files with 259 additions and 236 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
ChangeLog
View File

@ -1,3 +1,43 @@
Sat Jul 22 01:56:03 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* sysdeps/unix/i386/sysdep.h (JUMPTARGET): New macro; use name@PLT
#ifdef PIC.
(PSEUDO): Use JUMPTARGET(syscall_error) in jump insn.
* sysdeps/unix/i386/syscall.S: Use JUMPTARGET(syscall_error) in
jump insn.
* sysdeps/unix/sysv/sysv4/linux/i386/sysdep.h: Rewritten.
* sysdeps/unix/sysv/sysv4/linux/i386/syscall.S: New file.
* sysdeps/unix/sysv/sysv4/linux/i386/socket.S: Include
<sys/socketcall.h>. Save %ebx in call-clobbered %edx instead of
stack. Use JUMPTARGET(syscall_error) in jump insn.
* Makeconfig (+gccwarn): Add -Wbad-function-cast -Wconversion.
* sysdeps/unix/i386/sysdep.h (ENTRY): Use ASM_GLOBAL_DIRECTIVE and
ASM_TYPE_DIRECTIVE.
(ASM_TYPE_DIRECTIVE): New macro; defined using `.type' #ifdef ELF.
* sysdeps/unix/sysv/sysv4/linux/i386/sysdep.S (__syscall_error):
Rewritten, #include'ing unix/i386/sysdep.S for most of the code.
* sysdeps/unix/i386/sysdep.S [PIC]: Store into `errno' through the GOT.
Fixes to help Linux, inspired by drepper's work:
* configure.in (os=linux*): Use unix/sysv/sysv4 for $base_os,
instead of unix/sysv.
* sysdeps/posix/utimes.c: New file.
* sysdeps/generic/getdomain.c: New file.
* sysdeps/i386/init-first.c: Removed gratuitous #include <hurd.h>.
* sysdeps/generic/dl-sysdep.c: Include <unistd.h> and declare
externals _dl_argc, _dl_argc, and _environ.
* sysdeps/unix/sysv/linux/{accept,connect,getsockname,rename,
socketpair,waitpid,bind,getpeername,listen,setsid,wait4}.S: Moved
to new directory sysdeps/unix/sysv/sysv4/linux.
* sysdeps/unix/sysv/linux: Directory removed.
* sysdeps/unix/sysv/i386/linux/{socket.S,sysdep.h,sysdep.S}: Moved
to new directory sysdeps/unix/sysv/sysv4/linux/i386.
* sysdeps/unix/sysv/linux/i386: Directory removed.
Fri Jul 21 12:57:29 1995 Michael I Bushnell <mib@geech.gnu.ai.mit.edu>
* sysdeps/mach/hurd/socket.c (socket): Consider MIG_BAD_ID and

3
Makeconfig
View File

@ -294,7 +294,8 @@ RANLIB = ranlib
endif
# Extra flags to pass to GCC.
+gccwarn := -Wall -Wwrite-strings -Wno-parentheses -Winline
+gccwarn := -Wall -Wwrite-strings -Wno-parentheses -Winline \
-Wbad-function-cast -Wconversion
# This is the program that generates makefile
# dependencies from C source files.

4
configure.in
View File

@ -111,9 +111,9 @@ netbsd* | 386bsd* | freebsd* | bsdi*)
base_os=unix/bsd/bsd4.4 ;;
osf* | sunos* | ultrix* | newsos* | dynix* | *bsd*)
base_os=unix/bsd ;;
linux* | sysv* | isc* | esix* | sco* | minix* | irix4*)
sysv* | isc* | esix* | sco* | minix* | irix4*)
base_os=unix/sysv ;;
solaris[2-9]*)
linux* | solaris[2-9]*)
base_os=unix/sysv/sysv4 ;;
none)
base_os=standalone ;;

5
sysdeps/generic/dl-sysdep.c
View File

@ -21,6 +21,11 @@ Cambridge, MA 02139, USA. */
#include <sys/types.h>
#include <fcntl.h>
#include <link.h>
#include <unistd.h>
extern int _dl_argc;
extern char **_dl_argv;
extern char **_environ;
Elf32_Addr
_dl_sysdep_start (void **start_argptr,

43
sysdeps/unix/sysv/i386/linux/sysdep.S → sysdeps/generic/getdomain.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
/* Copyright (C) 1994, 1995 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
@ -16,23 +16,28 @@ 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. */
#include <sysdep.h>
#define _ERRNO_H
#include <errnos.h>
#include <errno.h>
#include <unistd.h>
#include <sys/utsname.h>
/* We jump here when a system call gets an error.
The error number is negated in %eax. */
.globl syscall_error
syscall_error:
negl %eax /* Make it positive. */
#if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
/* We translate the system's EWOULDBLOCK error into EAGAIN.
The GNU C library always defines EWOULDBLOCK==EAGAIN.
EWOULDBLOCK_sys is the original number. */
cmpl %eax, $EWOULDBLOCK_sys /* Is it the old EWOULDBLOCK? */
jne 0f /* Branch if not. */
move $EAGAIN, %eax /* Yes; translate it to EAGAIN. */
#if _UTSNAME_DOMAIN_LENGTH
/* The `uname' information includes the domain name. */
/* Put the name of the current YP domain in no more than LEN bytes of NAME.
The result is null-terminated if LEN is large enough for the full
name and the terminator. */
int
getdomainname (char *name, size_t len)
{
struct utsname u;
if (uname (&u) < 0)
return -1;
strncpy (name, u.domainname, len);
return 0;
}
#else
#include <sysdeps/stub/getdomain.c>
#endif
0: movl %eax, _errno /* Store it in `errno'. */
move $-1, %eax /* Return -1. */
ret

42
sysdeps/posix/utimes.c Normal file
View File

@ -0,0 +1,42 @@
/* Copyright (C) 1995 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. */
#include <sys/time.h>
#include <errno.h>
#include <stddef.h>
/* Change the access time of FILE to TVP[0] and
the modification time of FILE to TVP[1]. */
int
__utimes (const char *file, struct timeval tvp[2])
{
struct utimbuf buf, *times;
if (tvp)
{
times = &buf;
times->actime = tvp[0].tv_sec + tvp[0].tv_usec / 1000;
times->modtime = tvp[1].tv_sec + tvp[1].tv_usec / 1000;
}
else
times = NULL;
return utime (path, times);
}
weak_alias (__utimes, utimes)

4
sysdeps/unix/i386/syscall.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1993 Free Software Foundation, Inc.
/* Copyright (C) 1993, 1995 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
@ -24,5 +24,5 @@ ENTRY (syscall)
popl %eax /* Pop syscall number into %eax. */
pushl %ecx /* Push back return address. */
.byte 0x9a, 0, 0, 0, 0, 7, 0 /* lcall $7, $0 -- gas bug */
jb syscall_error
jb JUMPTARGET(syscall_error)
ret

14
sysdeps/unix/i386/sysdep.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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
@ -37,6 +37,16 @@ syscall_error:
jne notb /* Branch if not. */
movl $EAGAIN, %eax /* Yes; translate it to EAGAIN. */
#endif
notb: movl %eax, C_SYMBOL_NAME(errno)
notb:
#ifndef PIC
movl %eax, C_SYMBOL_NAME(errno)
#else
/* Standard PIC nonsense to store into `errno' through the GOT. */
call here
here: popl %ecx
addl $_GLOBAL_OFFSET_TABLE_+[.-here], %ecx
movl C_SYMBOL_NAME(errno@GOT)(%ecx), %ecx
movl %eax, (%ecx)
#endif
movl $-1, %eax
ret

19
sysdeps/unix/i386/sysdep.h
View File

@ -20,11 +20,20 @@ Cambridge, MA 02139, USA. */
#ifdef ASSEMBLER
/* Define an entry point visible from C. */
#define ENTRY(name) \
.globl C_SYMBOL_NAME(name); \
ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \
.align 4; \
C_LABEL(name)
/* For ELF we need the `.type' directive to make shared libs work right. */
#ifdef HAVE_ELF
#define ASM_TYPE_DIRECTIVE(name,type) .type name,type;
#else
#define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
#endif
#ifdef NO_UNDERSCORES
/* Since C identifiers are not normally prefixed with an underscore
on this system, the asm identifier `syscall_error' intrudes on the
@ -36,7 +45,13 @@ Cambridge, MA 02139, USA. */
.globl syscall_error; \
ENTRY (name) \
DO_CALL (syscall_name, args); \
jb syscall_error
jb JUMPTARGET(syscall_error)
#ifdef PIC
#define JUMPTARGET(name) name@PLT
#else
#define JUMPTARGET(name) name
#endif
/* This is defined as a separate macro so that other sysdep.h files
can include this one and then redefine DO_CALL. */

57
sysdeps/unix/sysv/i386/linux/sysdep.h
View File

@ -1,57 +0,0 @@
/* Copyright (C) 1992, 1993 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. */
#include <sysdeps/unix/sysdep.h>
#define ENTRY(name) \
.globl _##name; \
.align 2; \
_##name##:
#define PSEUDO(name, syscall_name, args) \
.text; \
.globl syscall_error; \
ENTRY (name) \
XCHG_##args
movl $SYS_##syscall_name, %eax; \
int $0x80; \
test %eax, %eax; \
jl syscall_error; \
XCHG_##args
/* Linux takes system call arguments in registers:
1: %ebx
2: %ecx
3: %edx
4: %esi
5: %edi
We put the arguments into registers from the stack,
and save the registers, by using the 386 `xchg' instruction
to swap the values in both directions. */
#define XCHG_0 /* No arguments to frob. */
#define XCHG_1 xchg 8(%esp), %ebx; XCHG_0
#define XCHG_2 xchg 12(%esp), %ecx; XCHG_1
#define XCHG_3 xchg 16(%esp), %edx; XCHG_2
#define XCHG_4 xchg 20(%esp), %esi; XCHG_3
#define XCHG_5 xchg 24(%esp), %edi; XCHG_3
#define r0 %eax /* Normal return-value register. */
#define r1 %edx /* Secondary return-value register. */
#define scratch %ecx /* Call-clobbered register for random use. */
#define MOVE(x,y) movl x, y

2
sysdeps/unix/sysv/linux/Implies
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@ -1,2 +0,0 @@
# Linux has the set of things which are also common to BSD and SVR4.
unix/common

124
sysdeps/unix/sysv/linux/syscall.h
View File

@ -1,124 +0,0 @@
#ifndef _SYSCALL_H
#define _SYSCALL_H
#define SYS_setup 0 /* Used only by init, to get system going. */
#define SYS_exit 1
#define SYS_fork 2
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_waitpid 7
#define SYS_creat 8
#define SYS_link 9
#define SYS_unlink 10
#define SYS_execve 11
#define SYS_chdir 12
#define SYS_time 13
#define SYS_mknod 14
#define SYS_chmod 15
#define SYS_chown 16
#define SYS_brk 17
#define SYS_oldstat 18
#define SYS_lseek 19
#define SYS_getpid 20
#define SYS_mount 21
#define SYS_umount 22
#define SYS_setuid 23
#define SYS_getuid 24
#define SYS_stime 25
#define SYS_ptrace 26
#define SYS_alarm 27
#define SYS_oldfstat 28
#define SYS_pause 29
#define SYS_utime 30
#define SYS_stty 31
#define SYS_gtty 32
#define SYS_access 33
#define SYS_nice 34
#define SYS_ftime 35
#define SYS_sync 36
#define SYS_kill 37
#define SYS_rename 38
#define SYS_mkdir 39
#define SYS_rmdir 40
#define SYS_dup 41
#define SYS_pipe 42
#define SYS_times 43
#define SYS_prof 44
#if 0
#define SYS_brk 45 /* Where did this bogosity crom from? */
#endif
#define SYS_setgid 46
#define SYS_getgid 47
#define SYS_signal 48
#define SYS_geteuid 49
#define SYS_getegid 50
#define SYS_acct 51
#define SYS_phys 52
#define SYS_lock 53
#define SYS_ioctl 54
#define SYS_fcntl 55
#define SYS_mpx 56
#define SYS_setpgrp 57
#define SYS_ulimit 58
#define SYS_olduname 59
#define SYS_umask 60
#define SYS_chroot 61
#define SYS_ustat 62
#define SYS_dup2 63
#define SYS_getppid 64
#define SYS_getpgrp 65
#define SYS_setsid 66
#define SYS_sigaction 67
#define SYS_siggetmask 68
#define SYS_sigsetmask 69
#define SYS_setreuid 70
#define SYS_setregid 71
#define SYS_sigsuspend 72
#define SYS_sigpending 73
#define SYS_sethostname 74
#define SYS_setrlimit 75
#define SYS_getrlimit 76
#define SYS_getrusage 77
#define SYS_gettimeofday 78
#define SYS_settimeofday 79
#define SYS_getgroups 80
#define SYS_setgroups 81
#define SYS_select 82
#define SYS_symlink 83
#define SYS_oldlstat 84
#define SYS_readlink 85
#define SYS_uselib 86
#define SYS_swapon 87
#define SYS_reboot 88
#define SYS_readdir 89
#define SYS_mmap 90
#define SYS_munmap 91
#define SYS_truncate 92
#define SYS_ftruncate 93
#define SYS_fchmod 94
#define SYS_fchown 95
#define SYS_getpriority 96
#define SYS_setpriority 97
#define SYS_profil 98
#define SYS_statfs 99
#define SYS_fstatfs 100
#define SYS_ioperm 101
#define SYS_socketcall 102
#define SYS_syslog 103
#define SYS_setitimer 104
#define SYS_getitimer 105
#define SYS_stat 106
#define SYS_lstat 107
#define SYS_fstat 108
#define SYS_uname 109
#define SYS_iopl 110
#define SYS_vhangup 111
#define SYS_idle 112
#define SYS_vm86 113
#define SYS_wait4 114
#define SYS_swapoff 115
#endif /* syscall.h */

0
sysdeps/unix/sysv/linux/accept.S → sysdeps/unix/sysv/sysv4/linux/accept.S
View File

0
sysdeps/unix/sysv/linux/bind.S → sysdeps/unix/sysv/sysv4/linux/bind.S
View File

0
sysdeps/unix/sysv/linux/connect.S → sysdeps/unix/sysv/sysv4/linux/connect.S
View File

0
sysdeps/unix/sysv/linux/getpeername.S → sysdeps/unix/sysv/sysv4/linux/getpeername.S
View File

0
sysdeps/unix/sysv/linux/getsockname.S → sysdeps/unix/sysv/sysv4/linux/getsockname.S
View File

17
sysdeps/unix/sysv/i386/linux/socket.S → sysdeps/unix/sysv/sysv4/linux/i386/socket.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
/* Copyright (C) 1995 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
@ -17,6 +17,7 @@ not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <sysdep.h>
#include <sys/socketcall.h>
.globl syscall_error
@ -24,32 +25,30 @@ Cambridge, MA 02139, USA. */
They are all gated through the single `socketcall' system call number.
`socketcall' takes two arguments: the first is the subcode, specifying
which socket function is being called; and the second is a pointer to
the arguments to specific function.
the arguments to the specific function.
The .S files for the other calls just #define socket and #include this. */
ENTRY (socket)
/* Save registers. */
pushl %ebx
pushl %ecx
movl %ebx, %edx
movl $__NR_socketcall, %eax /* System call number in %eax. */
movl $SYS_socketcall, %eax /* System call number in %eax. */
/* Use ## so `socket' is a separate token that might be #define'd. */
movl $SYS_##socket, %ebx /* Subcode is first arg to syscall. */
lea 12(%esp), %ecx /* Address of args in 2nd arg. */
lea 8(%esp), %ecx /* Address of args is 2nd arg. */
/* Do the system call trap. */
int $0x80
/* Restore registers. */
popl %ecx
popl %ebx
movl %edx, %ebx
/* %eax is < 0 if there was an error. */
testl %eax, %eax
jl syscall_error
jl JUMPTARGET(syscall_error)
/* Successful; return the syscall's value. */
ret

22
sysdeps/unix/sysv/i386/linux/wait.S → sysdeps/unix/sysv/sysv4/linux/i386/syscall.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
/* Copyright (C) 1995 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
@ -18,14 +18,12 @@ Cambridge, MA 02139, USA. */
#include <sysdep.h>
ENTRY (__wait)
movl 0(%esp), %eax /* Fetch the return address. */
movl $-1, 0(%esp) /* First arg is -1. */
/* Second arg is our arg at 4(%esp). */
pushl $0 /* Third arg is 0. */
pushl %eax /* Push the return address. */
/* Jump to waitpid; it will return to our caller. */
jmp ___waitpid
weak_alias (__wait, wait)
ASM_GLOBAL_DIRECTIVE syscall_error
ENTRY (syscall)
popl %ecx /* Pop return address into %ecx. */
popl %eax /* Pop syscall number into %eax. */
pushl %ecx /* Push back return address. */
DO_CALL (5) /* Frob the args and do the system call. */
testl %eax, %eax /* Check %eax for error. */
jl JUMPTARGET(syscall_error) /* Jump to error handler if negative. */
ret /* Return to caller. */

13
sysdeps/unix/sysv/linux/getpgrp.S → sysdeps/unix/sysv/sysv4/linux/i386/sysdep.S
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
/* Copyright (C) 1995 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
@ -16,7 +16,12 @@ 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. */
#include <sysdep.h>
/* The syscall stubs jump here when they detect an error.
The code for Linux is almost identical to the canonical Unix/i386
code, except that the error number in %eax is negated. */
SYSCALL (getpgrp, 0)
ret
__syscall_error:
negl %eax
#define __syscall_error __syscall_error_1
#include <sysdeps/unix/i386/sysdep.S>

86
sysdeps/unix/sysv/sysv4/linux/i386/sysdep.h Normal file
View File

@ -0,0 +1,86 @@
/* Copyright (C) 1992, 1993, 1995 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. */
/* In the Linux/ELF world, C symbols are asm symbols. */
#define NO_UNDERSCORES
/* There is some commonality. */
#include <sysdeps/unix/i386/sysdep.h>
#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; \
.globl __syscall_error; \
ENTRY (name) \
movl $SYS_##syscall_name, %eax; \
DO_CALL (args) \
testl %eax, %eax; \
jl JUMPTARGET(__syscall_error)
/* 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:
24(%esp) Arg# 5
20(%esp) Arg# 4
16(%esp) Arg# 3
12(%esp) Arg# 2
8(%esp) Arg# 1
4(%esp) Return address
(%esp)
(Of course a function with e.g. 3 argumentS does not have entries for
arguments 4 and 5.)
We put the arguments into registers from the stack, and save the
call-saved registers, by using the 386 `xchg' instruction to swap the
values in both directions. */
#undef DO_CALL
#define DO_CALL(args) \
DOARGS_##args \
int $0x80; \
UNDOARGS_##args \
#define DOARGS_0 /* No arguments to frob. */
#define UNDOARGS_0 /* No arguments to unfrob. */
#define DOARGS_1 xchg 8(%esp), %ebx; DOARGS_0 /* Save %ebx on stack. */
#define UNDOARGS_1 xchg 8(%esp), %ebx; UNDOARGS_0 /* Restore %ebx */
#define DOARGS_2 movel 12(%esp), %ecx; DOARGS_1
#define UNDOARGS_2 UNDOARGS_1 /* %ecx is clobbered. */
#define DOARGS_3 movel 16(%esp), %edx; DOARGS_2
#define UNDOARGS_3 UNDOARGS_2 /* %edx is clobbered. */
#define DOARGS_4 xchg 20(%esp), %esi; DOARGS_3 /* Save %esi on stack. */
#define UNDOARGS_4 xchg 20(%esp), %esi; UNDOARGS_3 /* Restore %esi. */
#define DOARGS_5 xchg 24(%esp), %edi; DOARGS_3 /* Save %edi on stack. */
#define UNDOARGS_5 xchg 24(%esp), %edi; UNDOARGS_3 /* Restore %edi. */
#endif /* ASSEMBLER */

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sysdeps/unix/sysv/linux/listen.S → sysdeps/unix/sysv/sysv4/linux/listen.S
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sysdeps/unix/sysv/linux/rename.S → sysdeps/unix/sysv/sysv4/linux/rename.S
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sysdeps/unix/sysv/linux/setsid.S → sysdeps/unix/sysv/sysv4/linux/setsid.S
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sysdeps/unix/sysv/linux/socketpair.S → sysdeps/unix/sysv/sysv4/linux/socketpair.S
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sysdeps/unix/sysv/linux/wait4.S → sysdeps/unix/sysv/sysv4/linux/wait4.S
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sysdeps/unix/sysv/linux/waitpid.S → sysdeps/unix/sysv/sysv4/linux/waitpid.S
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