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freebsd-nq/lib/libc/arm/SYS.h

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Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
/* $NetBSD: SYS.h,v 1.8 2003/08/07 16:42:02 agc Exp $ */
/*-
General further adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
2017-11-20 19:49:47 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* 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.
* 3. 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.
*
* from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
* $FreeBSD$
*/
#include <machine/asm.h>
#include <sys/syscall.h>
#include <machine/swi.h>
Update the syscall calling convention for ARM EABI. We store the syscall in r7 and use ip to store the old version of r7 as it is not guaranteed to be kept when calling a subroutine. The kernel will preserve the register across system calls.
2013-01-19 04:03:18 +00:00
#define SYSTRAP(x) \
mov ip, r7; \
ldr r7, =SYS_ ## x; \
swi 0; \
mov r7, ip
Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
#define CERROR _C_LABEL(cerror)
#define CURBRK _C_LABEL(curbrk)
#define _SYSCALL_NOERROR(x) \
ENTRY(__CONCAT(__sys_, x)); \
.weak _C_LABEL(x); \
.set _C_LABEL(x), _C_LABEL(__CONCAT(__sys_,x)); \
.weak _C_LABEL(__CONCAT(_,x)); \
.set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x)); \
SYSTRAP(x)
#define _SYSCALL(x) \
_SYSCALL_NOERROR(x); \
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
it cs; \
Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
bcs PIC_SYM(CERROR, PLT)
#define SYSCALL(x) \
_SYSCALL(x)
#define PSEUDO(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
ENTRY(__CONCAT(__sys_, x)); \
.weak _C_LABEL(__CONCAT(_,x)); \
.set _C_LABEL(__CONCAT(_,x)),_C_LABEL(__CONCAT(__sys_,x)); \
Fix remaining syntax errors (missing semicolons) Submitted by: Björn König <bkoenig@cs.tu-berlin.de> Approved by: re (kensmith, followup commits)
2007-07-05 17:42:00 +00:00
SYSTRAP(x); \
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
it cs; \
Fix remaining syntax errors (missing semicolons) Submitted by: Björn König <bkoenig@cs.tu-berlin.de> Approved by: re (kensmith, followup commits)
2007-07-05 17:42:00 +00:00
bcs PIC_SYM(CERROR, PLT); \
Use the RET macro. For setjmp() and longjmp(), put the signal mask where it's supposed to be, instead of in the space reserved for fp regs.
2004-11-09 16:49:14 +00:00
RET
Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
#define RSYSCALL(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
_SYSCALL(x); \
RET
Import the FreeBSD/arm libc bits. Obtained from: NetBSD
2004-05-14 12:04:31 +00:00
.globl CERROR
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