/* Copyright (C) 1992,1997-2003,2004,2005,2006 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _BITS_SYSCALLS_H #define _BITS_SYSCALLS_H #ifndef _SYSCALL_H # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead." #endif /* For Linux we can use the system call table in the header file /usr/include/asm/unistd.h of the kernel. But these symbols do not follow the SYS_* syntax so we have to redefine the `SYS_ify' macro here. */ #undef SYS_ify #define SYS_ify(syscall_name) __NR_##syscall_name #ifndef __ASSEMBLER__ # include <errno.h> # ifdef SHARED # define INLINE_VSYSCALL(name, nr, args...) \ ({ \ __label__ out; \ __label__ iserr; \ INTERNAL_SYSCALL_DECL (sc_err); \ long int sc_ret; \ \ if (__vdso_##name != NULL) \ { \ sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args); \ if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \ goto out; \ if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \ goto iserr; \ } \ \ sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \ if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \ { \ iserr: \ __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \ sc_ret = -1L; \ } \ out: \ sc_ret; \ }) # else # define INLINE_VSYSCALL(name, nr, args...) \ INLINE_SYSCALL (name, nr, ##args) # endif # ifdef SHARED # define INTERNAL_VSYSCALL(name, err, nr, args...) \ ({ \ __label__ out; \ long int v_ret; \ \ if (__vdso_##name != NULL) \ { \ v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \ if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \ || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \ goto out; \ } \ v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \ out: \ v_ret; \ }) # else # define INTERNAL_VSYSCALL(name, err, nr, args...) \ INTERNAL_SYSCALL (name, err, nr, ##args) # endif # define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...) \ ({ \ long int sc_ret = ENOSYS; \ \ if (__vdso_##name != NULL) \ sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \ else \ err = 1 << 28; \ sc_ret; \ }) /* List of system calls which are supported as vsyscalls. */ # define HAVE_CLOCK_GETRES_VSYSCALL 1 # define HAVE_CLOCK_GETTIME_VSYSCALL 1 /* Define a macro which expands inline into the wrapper code for a VDSO call. This use is for internal calls that do not need to handle errors normally. It will never touch errno. On powerpc a system call basically clobbers the same registers like a function call, with the exception of LR (which is needed for the "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal an error return status). */ # define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \ ({ \ register void *r0 __asm__ ("r0"); \ register long int r3 __asm__ ("r3"); \ register long int r4 __asm__ ("r4"); \ register long int r5 __asm__ ("r5"); \ register long int r6 __asm__ ("r6"); \ register long int r7 __asm__ ("r7"); \ register long int r8 __asm__ ("r8"); \ register long int r9 __asm__ ("r9"); \ register long int r10 __asm__ ("r10"); \ register long int r11 __asm__ ("r11"); \ register long int r12 __asm__ ("r12"); \ LOADARGS_##nr (funcptr, args); \ __asm__ __volatile__ \ ("mtctr %0\n\t" \ "bctrl\n\t" \ "mfcr %0" \ : "=&r" (r0), \ "=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \ "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \ : ASM_INPUT_##nr \ : "cr0", "ctr", "lr", "memory"); \ err = (long int) r0; \ (int) r3; \ }) # undef INLINE_SYSCALL # define INLINE_SYSCALL(name, nr, args...) \ ({ \ INTERNAL_SYSCALL_DECL (sc_err); \ long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \ if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \ { \ __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \ sc_ret = -1L; \ } \ sc_ret; \ }) /* Define a macro which expands inline into the wrapper code for a system call. This use is for internal calls that do not need to handle errors normally. It will never touch errno. On powerpc a system call basically clobbers the same registers like a function call, with the exception of LR (which is needed for the "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal an error return status). */ # undef INTERNAL_SYSCALL_DECL # define INTERNAL_SYSCALL_DECL(err) long int err # undef INTERNAL_SYSCALL # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ ({ \ register long int r0 __asm__ ("r0"); \ register long int r3 __asm__ ("r3"); \ register long int r4 __asm__ ("r4"); \ register long int r5 __asm__ ("r5"); \ register long int r6 __asm__ ("r6"); \ register long int r7 __asm__ ("r7"); \ register long int r8 __asm__ ("r8"); \ register long int r9 __asm__ ("r9"); \ register long int r10 __asm__ ("r10"); \ register long int r11 __asm__ ("r11"); \ register long int r12 __asm__ ("r12"); \ LOADARGS_##nr(name, args); \ __asm__ __volatile__ \ ("sc \n\t" \ "mfcr %0" \ : "=&r" (r0), \ "=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \ "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \ : ASM_INPUT_##nr \ : "cr0", "ctr", "memory"); \ err = r0; \ (int) r3; \ }) # define INTERNAL_SYSCALL(name, err, nr, args...) \ INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args) # undef INTERNAL_SYSCALL_ERROR_P # define INTERNAL_SYSCALL_ERROR_P(val, err) \ ((void) (val), __builtin_expect ((err) & (1 << 28), 0)) # undef INTERNAL_SYSCALL_ERRNO # define INTERNAL_SYSCALL_ERRNO(val, err) (val) # define LOADARGS_0(name, dummy) \ r0 = name # define LOADARGS_1(name, __arg1) \ long int arg1 = (long int) (__arg1); \ LOADARGS_0(name, 0); \ extern void __illegally_sized_syscall_arg1 (void); \ if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \ __illegally_sized_syscall_arg1 (); \ r3 = arg1 # define LOADARGS_2(name, __arg1, __arg2) \ long int arg2 = (long int) (__arg2); \ LOADARGS_1(name, __arg1); \ extern void __illegally_sized_syscall_arg2 (void); \ if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \ __illegally_sized_syscall_arg2 (); \ r4 = arg2 # define LOADARGS_3(name, __arg1, __arg2, __arg3) \ long int arg3 = (long int) (__arg3); \ LOADARGS_2(name, __arg1, __arg2); \ extern void __illegally_sized_syscall_arg3 (void); \ if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \ __illegally_sized_syscall_arg3 (); \ r5 = arg3 # define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \ long int arg4 = (long int) (__arg4); \ LOADARGS_3(name, __arg1, __arg2, __arg3); \ extern void __illegally_sized_syscall_arg4 (void); \ if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \ __illegally_sized_syscall_arg4 (); \ r6 = arg4 # define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \ long int arg5 = (long int) (__arg5); \ LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \ extern void __illegally_sized_syscall_arg5 (void); \ if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \ __illegally_sized_syscall_arg5 (); \ r7 = arg5 # define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \ long int arg6 = (long int) (__arg6); \ LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \ extern void __illegally_sized_syscall_arg6 (void); \ if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \ __illegally_sized_syscall_arg6 (); \ r8 = arg6 # define ASM_INPUT_0 "0" (r0) # define ASM_INPUT_1 ASM_INPUT_0, "1" (r3) # define ASM_INPUT_2 ASM_INPUT_1, "2" (r4) # define ASM_INPUT_3 ASM_INPUT_2, "3" (r5) # define ASM_INPUT_4 ASM_INPUT_3, "4" (r6) # define ASM_INPUT_5 ASM_INPUT_4, "5" (r7) # define ASM_INPUT_6 ASM_INPUT_5, "6" (r8) #undef _syscall0 #define _syscall0(type,name) \ type name(void){ \ return (type) INLINE_SYSCALL(name, 0); \ } #undef _syscall1 #define _syscall1(type,name,type1,arg1) \ type name(type1 arg1){ \ return (type) INLINE_SYSCALL(name, 1, arg1); \ } #undef _syscall2 #define _syscall2(type,name,type1,arg1,type2,arg2) \ type name(type1 arg1, type2 arg2){ \ return (type) INLINE_SYSCALL(name, 2, arg1, arg2); \ } #undef _syscall3 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ type name(type1 arg1, type2 arg2, type3 arg3){ \ return (type) INLINE_SYSCALL(name, 3, arg1, arg2, arg3); \ } #undef _syscall4 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4){ \ return (type) INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4); \ } #undef _syscall5 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5){ \ return (type) INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5); \ } #undef _syscall6 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5,type6,arg6) \ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5, type6 arg6){ \ return (type) INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6); \ } #endif /* __ASSEMBLER__ */ /* Pointer mangling support. */ #if defined NOT_IN_libc && defined IS_IN_rtld /* We cannot use the thread descriptor because in ld.so we use setjmp earlier than the descriptor is initialized. */ #else # ifdef __ASSEMBLER__ # define PTR_MANGLE(reg, tmpreg) \ lwz tmpreg,POINTER_GUARD(r2); \ xor reg,tmpreg,reg # define PTR_MANGLE2(reg, tmpreg) \ xor reg,tmpreg,reg # define PTR_MANGLE3(destreg, reg, tmpreg) \ lwz tmpreg,POINTER_GUARD(r2); \ xor destreg,tmpreg,reg # define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg) # define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg) # define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg) # else # define PTR_MANGLE(var) \ (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) # define PTR_DEMANGLE(var) PTR_MANGLE (var) # endif #endif #endif /* _BITS_SYSCALLS_H */