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Diffstat (limited to 'lib/libc/amd64/SYS.h')
| -rw-r--r-- | lib/libc/amd64/SYS.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/lib/libc/amd64/SYS.h b/lib/libc/amd64/SYS.h new file mode 100644 index 0000000..a5daa1c --- /dev/null +++ b/lib/libc/amd64/SYS.h @@ -0,0 +1,92 @@ +/*- + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 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. + * + * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 + * + * $FreeBSD$ + */ + +#include <sys/syscall.h> +#include "DEFS.h" + +#define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \ + ENTRY(__CONCAT(_,x)); \ + .weak CNAME(x); \ + .set CNAME(x),CNAME(__CONCAT(_,x)); \ + lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b +#define RSYSCALL(x) SYSCALL(x); ret + +#define PSEUDO(x,y) ENTRY(__CONCAT(_,x)); \ + .weak CNAME(x); \ + .set CNAME(x),CNAME(__CONCAT(_,x)); \ + lea __CONCAT(SYS_,y), %eax; KERNCALL; ret +/* gas messes up offset -- although we don't currently need it, do for BCS */ +#define LCALL(x,y) .byte 0x9a ; .long y; .word x + +/* + * Design note: + * + * The macros PSYSCALL() and PRSYSCALL() are intended for use where a + * syscall needs to be renamed in the threaded library. When building + * a normal library, they default to the traditional SYSCALL() and + * RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere + * that the renamed function needs to be called. + */ +#ifdef _THREAD_SAFE +/* + * For the thread_safe versions, we prepend _thread_sys_ to the function + * name so that the 'C' wrapper can go around the real name. + */ +#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \ + ENTRY(__CONCAT(_thread_sys_,x)); \ + lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b +#define PRSYSCALL(x) PSYSCALL(x); ret +#define PPSEUDO(x,y) ENTRY(__CONCAT(_thread_sys_,x)); \ + lea __CONCAT(SYS_,y), %eax; KERNCALL; ret +#else +/* + * The non-threaded library defaults to traditional syscalls where + * the function name matches the syscall name. + */ +#define PSYSCALL(x) SYSCALL(x) +#define PRSYSCALL(x) RSYSCALL(x) +#define PPSEUDO(x,y) PSEUDO(x,y) +#endif + +#ifdef __ELF__ +#define KERNCALL int $0x80 /* Faster */ +#else +#define KERNCALL LCALL(7,0) /* The old way */ +#endif |
