+/* 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__
-/* Define a macro which expands inline into the wrapper code for a system
+# 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). */
-
-#include <errno.h>
-
-#define SYS_ify(syscall_name) (__NR_##syscall_name)
+# 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
-#if 1
# define INLINE_SYSCALL(name, nr, args...) \
({ \
INTERNAL_SYSCALL_DECL (sc_err); \
} \
sc_ret; \
})
-#else
-# 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)) \
- { \
- sc_ret = __syscall_error(INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));\
- } \
- sc_ret; \
- })
-#endif
/* 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
register long int r10 __asm__ ("r10"); \
register long int r11 __asm__ ("r11"); \
register long int r12 __asm__ ("r12"); \
- LOADARGS_##nr(name, args); \
+ LOADARGS_##nr(name, args); \
__asm__ __volatile__ \
("sc \n\t" \
"mfcr %0" \
# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val, err) (val)
-# define LOADARGS_0(name, dummy) \
- r0 = (long int)name
+# define LOADARGS_0(name, dummy) \
+ r0 = name
# define LOADARGS_1(name, __arg1) \
- LOADARGS_0(name, 0); \
- r3 = (long int)__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); \
- r4 = (long int)__arg2
+ 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); \
- r5 = (long int)__arg3
+ 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); \
- r6 = (long int)__arg4
+ 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); \
- r7 = (long int)__arg5
+ 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); \
- r8 = (long int)__arg6
+ 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_5 ASM_INPUT_4, "5" (r7)
# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
+
#undef _syscall0
#define _syscall0(type,name) \
type name(void){ \
}
#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 */
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