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freebsd-dev/lib/libc/amd64/SYS.h

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BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
/*-
First crack at making libc work with the new make macros. It compiles on my machine, and a simple static (genassym) and shared (sysctl) executable both work. Still to be done: RPCand YP merge.
1994-08-05 01:19:12 +00:00
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
Fix the style of the SCM ID's. I believe have made all of libc .h's as consistent as possible.
2002-03-22 23:42:05 +00:00
* @(#)SYS.h 5.5 (Berkeley) 5/7/91
$Id$ -> $FreeBSD$
1999-08-28 00:22:10 +00:00
* $FreeBSD$
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
*/
#include <sys/syscall.h>
De-orbit DEFS.h - the other arches do not use it, and it got replaced with <machine/asm.h>. Reviewed by: bde
2001-10-24 20:29:14 +00:00
#include <machine/asm.h>
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
Repair PIC mode. It seems I was a bit too excited about the implications of native PC relative addressing.
2003-05-24 17:35:23 +00:00
#ifdef PIC
Change the syscall stub branch orders so that the static branch prediction will assume that syscalls will succeed rather than fail.
2004-02-22 02:11:39 +00:00
#define RSYSCALL(x) ENTRY(__CONCAT(__sys_,x)); \
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
.weak CNAME(x); \
.set CNAME(x),CNAME(__CONCAT(__sys_,x)); \
.weak CNAME(__CONCAT(_,x)); \
.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
Change the syscall stub branch orders so that the static branch prediction will assume that syscalls will succeed rather than fail.
2004-02-22 02:11:39 +00:00
mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2f; ret; \
2: movq PIC_GOT(HIDENAME(cerror)),%rcx; jmp *%rcx
Adjust the syscall stub macros to be consistent in their meaning. In particular: SYSCALL() makes a syscall, with errno handling, and continues execution directly after the macro in the non-error case. RSYSCALL() is just like SYSCALL(), but returns after success. Both SYSCALL(name) and RSYSCALL(name) export "__sys_name" as a strong symbol, with "_name" and "name" as weak aliases. PSEUDO() is just like RSYSCALL(), but skipping the "name" weak alias. It still does "__sys_name" and "_name". Change i386 to add errno handling to PSEUDO. The same for amd64 and sparc64, with appear to have copied the behavior. ia64 was correct (as was alpha). Just remove some apparently unused variants of the macros. (untested!) I believe powerpc is correct. Fix arm to not export "name" from the PSEUDO case. Remove apparently extra unused variants. (untested!) The errno problem manifested on i386/amd64/sparc64 by having "PSEUDO" classified syscalls return without setting errno. eg: "addr = mmap()" could return with "addr" = 22 instead of setting errno to 22 and returning -1. Approved by: re (kensmith)
2007-07-04 23:18:38 +00:00
#define PSEUDO(x) ENTRY(__CONCAT(__sys_,x)); \
.weak CNAME(__CONCAT(_,x)); \
.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2f; ret ; \
2: movq PIC_GOT(HIDENAME(cerror)),%rcx; jmp *%rcx
Repair PIC mode. It seems I was a bit too excited about the implications of native PC relative addressing.
2003-05-24 17:35:23 +00:00
#else
Change the syscall stub branch orders so that the static branch prediction will assume that syscalls will succeed rather than fail.
2004-02-22 02:11:39 +00:00
#define RSYSCALL(x) ENTRY(__CONCAT(__sys_,x)); \
Repair PIC mode. It seems I was a bit too excited about the implications of native PC relative addressing.
2003-05-24 17:35:23 +00:00
.weak CNAME(x); \
.set CNAME(x),CNAME(__CONCAT(__sys_,x)); \
.weak CNAME(__CONCAT(_,x)); \
.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
Change the syscall stub branch orders so that the static branch prediction will assume that syscalls will succeed rather than fail.
2004-02-22 02:11:39 +00:00
mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2f; ret; \
2: jmp HIDENAME(cerror)
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
Clean up syscall generation in libc by removing HIDDEN_SYSCALLS and treating (almost) all system calls the same way: __sys_foo - actual syscall foo, _foo - weak definitions to __sys_foo Change PSEUDO syscalls (currently only _exit and _getlogin) to be __sys_foo (T) and _foo (W). Add $FreeBSD$ to a few files to satisfy commitprep. Suggested by: bde
2001-01-29 03:23:46 +00:00
#define PSEUDO(x) ENTRY(__CONCAT(__sys_,x)); \
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
.weak CNAME(__CONCAT(_,x)); \
.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
Adjust the syscall stub macros to be consistent in their meaning. In particular: SYSCALL() makes a syscall, with errno handling, and continues execution directly after the macro in the non-error case. RSYSCALL() is just like SYSCALL(), but returns after success. Both SYSCALL(name) and RSYSCALL(name) export "__sys_name" as a strong symbol, with "_name" and "name" as weak aliases. PSEUDO() is just like RSYSCALL(), but skipping the "name" weak alias. It still does "__sys_name" and "_name". Change i386 to add errno handling to PSEUDO. The same for amd64 and sparc64, with appear to have copied the behavior. ia64 was correct (as was alpha). Just remove some apparently unused variants of the macros. (untested!) I believe powerpc is correct. Fix arm to not export "name" from the PSEUDO case. Remove apparently extra unused variants. (untested!) The errno problem manifested on i386/amd64/sparc64 by having "PSEUDO" classified syscalls return without setting errno. eg: "addr = mmap()" could return with "addr" = 22 instead of setting errno to 22 and returning -1. Approved by: re (kensmith)
2007-07-04 23:18:38 +00:00
mov __CONCAT($SYS_,x),%rax; KERNCALL; jb 2f; ret; \
2: jmp HIDENAME(cerror)
#endif
Clean up syscall generation in libc by removing HIDDEN_SYSCALLS and treating (almost) all system calls the same way: __sys_foo - actual syscall foo, _foo - weak definitions to __sys_foo Change PSEUDO syscalls (currently only _exit and _getlogin) to be __sys_foo (T) and _foo (W). Add $FreeBSD$ to a few files to satisfy commitprep. Suggested by: bde
2001-01-29 03:23:46 +00:00
Update for AMD64-style syscalls. Repocopied from i386/SYS.h. Note that the syscall instruction clobbers %rcx, which is inconvenient because it is the fourth syscall argument, so we use %r10 (another scratch register) for the 4th syscall arg instead (I picked %r10 to be the same as NetBSD). int 0x80 is still possible though, and it uses %rcx as usual. Note that the syscall style syscall does *NOT* preserve all the registers, unlike int 0x80. We do not preserve the scratch registers except for %rdi and %rsi. int 0x80 does preserve everything but the return values.
2003-04-30 18:06:14 +00:00
#define KERNCALL movq %rcx, %r10; syscall
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