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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 | /* 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, see <http://www.gnu.org/licenses/>. */ #ifndef _BITS_SYSCALLS_H #define _BITS_SYSCALLS_H #ifndef _SYSCALL_H # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead." #endif #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"); \ LOAD_ARGS_##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; \ }) /* 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). */ # define INTERNAL_SYSCALL_DECL(err) long int err # define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ (__extension__ \ ({ \ 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"); \ LOAD_ARGS_##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_ERROR_P(val, err) \ ((void) (val), unlikely ((err) & (1 << 28))) # define INTERNAL_SYSCALL_ERRNO(val, err) (val) extern void __illegally_sized_syscall_arg1(void); extern void __illegally_sized_syscall_arg2(void); extern void __illegally_sized_syscall_arg3(void); extern void __illegally_sized_syscall_arg4(void); extern void __illegally_sized_syscall_arg5(void); extern void __illegally_sized_syscall_arg6(void); # define LOAD_ARGS_0(name, dummy) \ r0 = name # define LOAD_ARGS_1(name, __arg1) \ long int arg1 = (long int) (__arg1); \ LOAD_ARGS_0(name, 0); \ if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \ __illegally_sized_syscall_arg1 (); \ r3 = arg1 # define LOAD_ARGS_2(name, __arg1, __arg2) \ long int arg2 = (long int) (__arg2); \ LOAD_ARGS_1(name, __arg1); \ if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \ __illegally_sized_syscall_arg2 (); \ r4 = arg2 # define LOAD_ARGS_3(name, __arg1, __arg2, __arg3) \ long int arg3 = (long int) (__arg3); \ LOAD_ARGS_2(name, __arg1, __arg2); \ if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \ __illegally_sized_syscall_arg3 (); \ r5 = arg3 # define LOAD_ARGS_4(name, __arg1, __arg2, __arg3, __arg4) \ long int arg4 = (long int) (__arg4); \ LOAD_ARGS_3(name, __arg1, __arg2, __arg3); \ if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \ __illegally_sized_syscall_arg4 (); \ r6 = arg4 # define LOAD_ARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \ long int arg5 = (long int) (__arg5); \ LOAD_ARGS_4(name, __arg1, __arg2, __arg3, __arg4); \ if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \ __illegally_sized_syscall_arg5 (); \ r7 = arg5 # define LOAD_ARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \ long int arg6 = (long int) (__arg6); \ LOAD_ARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \ 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) #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 */ |