diff options
Diffstat (limited to 'lib/libc/amd64/SYS.h')
| -rw-r--r-- | lib/libc/amd64/SYS.h | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/lib/libc/amd64/SYS.h b/lib/libc/amd64/SYS.h index caea98ff9e23..c8a86f5ee2d5 100644 --- a/lib/libc/amd64/SYS.h +++ b/lib/libc/amd64/SYS.h @@ -35,7 +35,7 @@ * * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 * - * $Id: SYS.h,v 1.3 1996/01/22 00:00:51 julian Exp $ + * $Id: SYS.h,v 1.4 1996/05/05 07:56:03 peter Exp $ */ #include <sys/syscall.h> @@ -64,20 +64,38 @@ #define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); ENTRY(x); lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b #define RSYSCALL(x) SYSCALL(x); ret +#define PSEUDO(x,y) ENTRY(x); lea __CONCAT(SYS_,y), %eax; KERNCALL; ret +#define CALL(x,y) call CNAME(y); addl $4*x,%esp +/* gas fucks 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 /* in case */ /* * For the thread_safe versions, we prepend _thread_sys_ to the function * name so that the 'C' wrapper can go around the real name. */ -#ifdef _THREAD_SAFE /* in case */ -#define PSYSCALL(x,y) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); ENTRY(y); lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b -#define PRSYSCALL(x,y) PSYSCALL(x,y); ret +#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); ENTRY(_thread_sys_/**/x); lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b +#define PRSYSCALL(x) PSYSCALL(x); ret +#define PPSEUDO(x,y) ENTRY(_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 -#define PSEUDO(x,y) ENTRY(x); lea __CONCAT(SYS_,y), %eax; KERNCALL; ret -#define CALL(x,y) call CNAME(y); addl $4*x,%esp -/* gas fucks up offset -- although we don't currently need it, do for BCS */ -#define LCALL(x,y) .byte 0x9a ; .long y; .word x - #ifdef __ELF__ #define KERNCALL int $0x80 /* Faster */ #else |