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@@ -1,26 +1,142 @@
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+/* Copyright (C) 1992,1997-2003,2004,2005,2006 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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#ifndef _BITS_SYSCALLS_H
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#define _BITS_SYSCALLS_H
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#ifndef _SYSCALL_H
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# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
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#endif
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+/* For Linux we can use the system call table in the header file
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+ /usr/include/asm/unistd.h
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+ of the kernel. But these symbols do not follow the SYS_* syntax
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+ so we have to redefine the `SYS_ify' macro here. */
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+#undef SYS_ify
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+#define SYS_ify(syscall_name) __NR_##syscall_name
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#ifndef __ASSEMBLER__
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-/* Define a macro which expands inline into the wrapper code for a system
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+# include <errno.h>
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+
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+# ifdef SHARED
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+# define INLINE_VSYSCALL(name, nr, args...) \
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+ ({ \
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+ __label__ out; \
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+ __label__ iserr; \
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+ INTERNAL_SYSCALL_DECL (sc_err); \
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+ long int sc_ret; \
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+ \
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+ if (__vdso_##name != NULL) \
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+ { \
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+ sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args); \
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+ if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
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+ goto out; \
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+ if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS) \
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+ goto iserr; \
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+ } \
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+ \
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+ sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args); \
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+ if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
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+ { \
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+ iserr: \
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+ __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
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+ sc_ret = -1L; \
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+ } \
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+ out: \
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+ sc_ret; \
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+ })
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+# else
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+# define INLINE_VSYSCALL(name, nr, args...) \
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+ INLINE_SYSCALL (name, nr, ##args)
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+# endif
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+
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+# ifdef SHARED
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+# define INTERNAL_VSYSCALL(name, err, nr, args...) \
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+ ({ \
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+ __label__ out; \
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+ long int v_ret; \
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+ \
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+ if (__vdso_##name != NULL) \
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+ { \
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+ v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
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+ if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err) \
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+ || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS) \
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+ goto out; \
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+ } \
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+ v_ret = INTERNAL_SYSCALL (name, err, nr, ##args); \
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+ out: \
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+ v_ret; \
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+ })
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+# else
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+# define INTERNAL_VSYSCALL(name, err, nr, args...) \
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+ INTERNAL_SYSCALL (name, err, nr, ##args)
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+# endif
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+
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+# define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...) \
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+ ({ \
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+ long int sc_ret = ENOSYS; \
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+ \
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+ if (__vdso_##name != NULL) \
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+ sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args); \
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+ else \
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+ err = 1 << 28; \
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+ sc_ret; \
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+ })
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+
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+/* List of system calls which are supported as vsyscalls. */
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+# define HAVE_CLOCK_GETRES_VSYSCALL 1
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+# define HAVE_CLOCK_GETTIME_VSYSCALL 1
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+
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+/* Define a macro which expands inline into the wrapper code for a VDSO
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno.
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On powerpc a system call basically clobbers the same registers like a
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function call, with the exception of LR (which is needed for the
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"sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
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an error return status). */
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-
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-#include <errno.h>
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-
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-#define SYS_ify(syscall_name) (__NR_##syscall_name)
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+# define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \
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+ ({ \
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+ register void *r0 __asm__ ("r0"); \
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+ register long int r3 __asm__ ("r3"); \
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+ register long int r4 __asm__ ("r4"); \
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+ register long int r5 __asm__ ("r5"); \
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+ register long int r6 __asm__ ("r6"); \
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+ register long int r7 __asm__ ("r7"); \
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+ register long int r8 __asm__ ("r8"); \
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+ register long int r9 __asm__ ("r9"); \
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+ register long int r10 __asm__ ("r10"); \
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+ register long int r11 __asm__ ("r11"); \
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+ register long int r12 __asm__ ("r12"); \
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+ LOADARGS_##nr (funcptr, args); \
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+ __asm__ __volatile__ \
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+ ("mtctr %0\n\t" \
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+ "bctrl\n\t" \
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+ "mfcr %0" \
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+ : "=&r" (r0), \
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+ "=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \
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+ "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \
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+ : ASM_INPUT_##nr \
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+ : "cr0", "ctr", "lr", "memory"); \
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+ err = (long int) r0; \
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+ (int) r3; \
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+ })
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# undef INLINE_SYSCALL
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-#if 1
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# define INLINE_SYSCALL(name, nr, args...) \
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({ \
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INTERNAL_SYSCALL_DECL (sc_err); \
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@@ -32,18 +148,6 @@
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} \
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sc_ret; \
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})
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-#else
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-# define INLINE_SYSCALL(name, nr, args...) \
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- ({ \
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- INTERNAL_SYSCALL_DECL (sc_err); \
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- long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
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- if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
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- { \
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- sc_ret = __syscall_error(INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));\
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- } \
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- sc_ret; \
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- })
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-#endif
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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@@ -70,7 +174,7 @@
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register long int r10 __asm__ ("r10"); \
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register long int r11 __asm__ ("r11"); \
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register long int r12 __asm__ ("r12"); \
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- LOADARGS_##nr(name, args); \
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+ LOADARGS_##nr(name, args); \
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__asm__ __volatile__ \
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("sc \n\t" \
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"mfcr %0" \
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@@ -92,26 +196,50 @@
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# undef INTERNAL_SYSCALL_ERRNO
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# define INTERNAL_SYSCALL_ERRNO(val, err) (val)
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-# define LOADARGS_0(name, dummy) \
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- r0 = (long int)name
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+# define LOADARGS_0(name, dummy) \
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+ r0 = name
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# define LOADARGS_1(name, __arg1) \
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- LOADARGS_0(name, 0); \
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- r3 = (long int)__arg1
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+ long int arg1 = (long int) (__arg1); \
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+ LOADARGS_0(name, 0); \
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+ extern void __illegally_sized_syscall_arg1 (void); \
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+ if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
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+ __illegally_sized_syscall_arg1 (); \
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+ r3 = arg1
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# define LOADARGS_2(name, __arg1, __arg2) \
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+ long int arg2 = (long int) (__arg2); \
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LOADARGS_1(name, __arg1); \
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- r4 = (long int)__arg2
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+ extern void __illegally_sized_syscall_arg2 (void); \
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+ if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
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+ __illegally_sized_syscall_arg2 (); \
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+ r4 = arg2
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# define LOADARGS_3(name, __arg1, __arg2, __arg3) \
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+ long int arg3 = (long int) (__arg3); \
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LOADARGS_2(name, __arg1, __arg2); \
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- r5 = (long int)__arg3
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+ extern void __illegally_sized_syscall_arg3 (void); \
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+ if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
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+ __illegally_sized_syscall_arg3 (); \
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+ r5 = arg3
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# define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
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+ long int arg4 = (long int) (__arg4); \
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LOADARGS_3(name, __arg1, __arg2, __arg3); \
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- r6 = (long int)__arg4
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+ extern void __illegally_sized_syscall_arg4 (void); \
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+ if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
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+ __illegally_sized_syscall_arg4 (); \
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+ r6 = arg4
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# define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
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+ long int arg5 = (long int) (__arg5); \
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LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
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- r7 = (long int)__arg5
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+ extern void __illegally_sized_syscall_arg5 (void); \
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+ if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
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+ __illegally_sized_syscall_arg5 (); \
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+ r7 = arg5
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# define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
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+ long int arg6 = (long int) (__arg6); \
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LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
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- r8 = (long int)__arg6
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+ extern void __illegally_sized_syscall_arg6 (void); \
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+ if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
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+ __illegally_sized_syscall_arg6 (); \
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+ r8 = arg6
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# define ASM_INPUT_0 "0" (r0)
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# define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
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@@ -121,6 +249,7 @@
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# define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
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# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
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+
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#undef _syscall0
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#define _syscall0(type,name) \
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type name(void){ \
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@@ -164,4 +293,30 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5, type6 arg6
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}
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#endif /* __ASSEMBLER__ */
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+
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+
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+/* Pointer mangling support. */
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+#if defined NOT_IN_libc && defined IS_IN_rtld
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+/* We cannot use the thread descriptor because in ld.so we use setjmp
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+ earlier than the descriptor is initialized. */
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+#else
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+# ifdef __ASSEMBLER__
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+# define PTR_MANGLE(reg, tmpreg) \
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+ lwz tmpreg,POINTER_GUARD(r2); \
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+ xor reg,tmpreg,reg
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+# define PTR_MANGLE2(reg, tmpreg) \
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+ xor reg,tmpreg,reg
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+# define PTR_MANGLE3(destreg, reg, tmpreg) \
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+ lwz tmpreg,POINTER_GUARD(r2); \
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+ xor destreg,tmpreg,reg
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+# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
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+# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
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+# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
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+# else
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+# define PTR_MANGLE(var) \
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+ (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
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+# define PTR_DEMANGLE(var) PTR_MANGLE (var)
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+# endif
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+#endif
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+
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#endif /* _BITS_SYSCALLS_H */
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