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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
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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
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@ -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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