sysdeps/unix/sysv/linux/powerpc/sysdep.h

   1 /* Syscall definitions, Linux PowerPC generic version.
   2    Copyright (C) 2019-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _LINUX_POWERPC_SYSDEP_H
  20 #define _LINUX_POWERPC_SYSDEP_H 1
  21
  22 #include <sysdeps/unix/sysv/linux/sysdep.h>
  23 #include <sysdeps/unix/powerpc/sysdep.h>
  24 #include <tls.h>
  25 /* Define __set_errno() for INLINE_SYSCALL macro below.  */
  26 #include <errno.h>
  27
  28 /* For Linux we can use the system call table in the header file
  29        /usr/include/asm/unistd.h
  30    of the kernel.  But these symbols do not follow the SYS_* syntax
  31    so we have to redefine the `SYS_ify' macro here.  */
  32 #undef SYS_ify
  33 #define SYS_ify(syscall_name)  __NR_##syscall_name
  34
  35 /* Define a macro which expands inline into the wrapper code for a system
  36    call. This use is for internal calls that do not need to handle errors
  37    normally. It will never touch errno. This returns just what the kernel
  38    gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
  39    the negation of the return value in the kernel gets reverted.  */
  40
  41 #define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, type, nr, args...)         \
  42   ({                                                                    \
  43     register void *r0  __asm__ ("r0");                                  \
  44     register long int r3  __asm__ ("r3");                               \
  45     register long int r4  __asm__ ("r4");                               \
  46     register long int r5  __asm__ ("r5");                               \
  47     register long int r6  __asm__ ("r6");                               \
  48     register long int r7  __asm__ ("r7");                               \
  49     register long int r8  __asm__ ("r8");                               \
  50     register type rval  __asm__ ("r3");                                 \
  51     LOADARGS_##nr (funcptr, args);                                      \
  52     __asm__ __volatile__                                                \
  53       ("mtctr %0\n\t"                                                   \
  54        "bctrl\n\t"                                                      \
  55        "mfcr  %0\n\t"                                                   \
  56        "0:"                                                             \
  57        : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),        \
  58          "+r" (r7), "+r" (r8)                                           \
  59        : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory");    \
  60     __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3));                 \
  61     (long int) r0 & (1 << 28) ? -rval : rval;                           \
  62   })
  63
  64 #define INTERNAL_VSYSCALL_CALL(funcptr, nr, args...)                    \
  65   INTERNAL_VSYSCALL_CALL_TYPE(funcptr, long int, nr, args)
  66
  67 #define DECLARE_REGS                            \
  68   register long int r0  __asm__ ("r0");         \
  69   register long int r3  __asm__ ("r3");         \
  70   register long int r4  __asm__ ("r4");         \
  71   register long int r5  __asm__ ("r5");         \
  72   register long int r6  __asm__ ("r6");         \
  73   register long int r7  __asm__ ("r7");         \
  74   register long int r8  __asm__ ("r8");
  75
  76 #define SYSCALL_SCV(nr)                         \
  77   ({                                            \
  78     __asm__ __volatile__                        \
  79       ("scv 0\n\t"                              \
  80        "0:"                                     \
  81        : "=&r" (r0),                            \
  82          "=&r" (r3), "=&r" (r4), "=&r" (r5),    \
  83          "=&r" (r6), "=&r" (r7), "=&r" (r8)     \
  84        : ASM_INPUT_##nr                 \
  85        : "r9", "r10", "r11", "r12",             \
  86          "lr", "ctr", "memory");                \
  87     r3;                                 \
  88   })
  89
  90 #define SYSCALL_SC(nr)                          \
  91   ({                                            \
  92     __asm__ __volatile__                        \
  93       ("sc\n\t"                         \
  94        "mfcr %0\n\t"                            \
  95        "0:"                                     \
  96        : "=&r" (r0),                            \
  97          "=&r" (r3), "=&r" (r4), "=&r" (r5),    \
  98          "=&r" (r6), "=&r" (r7), "=&r" (r8)     \
  99        : ASM_INPUT_##nr                 \
 100        : "r9", "r10", "r11", "r12",             \
 101          "cr0", "ctr", "memory");               \
 102     r0 & (1 << 28) ? -r3 : r3;                  \
 103   })
 104
 105 /* This will only be non-empty for 64-bit systems, see below.  */
 106 #define TRY_SYSCALL_SCV(nr)
 107
 108 #if defined(__PPC64__) || defined(__powerpc64__)
 109 # define SYSCALL_ARG_SIZE 8
 110
 111 /* For the static case, unlike the dynamic loader, there is no compile-time way
 112    to check if we are inside startup code.  So we need to check if the thread
 113    pointer has already been setup before trying to access the TLS.  */
 114 # ifndef SHARED
 115 #  define CHECK_THREAD_POINTER (__thread_register != 0)
 116 # else
 117 #  define CHECK_THREAD_POINTER (1)
 118 # endif
 119
 120 /* When inside the dynamic loader, the thread pointer may not have been
 121    initialized yet, so don't check for scv support in that case.  */
 122 # if !IS_IN(rtld)
 123 #  undef TRY_SYSCALL_SCV
 124 #  define TRY_SYSCALL_SCV(nr)                                           \
 125   CHECK_THREAD_POINTER && THREAD_GET_HWCAP() & PPC_FEATURE2_SCV ?       \
 126       SYSCALL_SCV(nr) :
 127 # endif
 128
 129 #else
 130 # define SYSCALL_ARG_SIZE 4
 131 #endif
 132
 133 # define INTERNAL_SYSCALL_NCS(name, nr, args...)        \
 134   ({                                                    \
 135     DECLARE_REGS;                                       \
 136     LOADARGS_##nr (name, ##args);                       \
 137     TRY_SYSCALL_SCV(nr)                                 \
 138     SYSCALL_SC(nr);                                     \
 139   })
 140
 141 #undef INTERNAL_SYSCALL
 142 #define INTERNAL_SYSCALL(name, nr, args...)                             \
 143   INTERNAL_SYSCALL_NCS (__NR_##name, nr, args)
 144
 145 #define LOADARGS_0(name, dummy) \
 146         r0 = name
 147 #define LOADARGS_1(name, __arg1) \
 148         long int _arg1 = (long int) (__arg1); \
 149         LOADARGS_0(name, 0); \
 150         extern void __illegally_sized_syscall_arg1 (void); \
 151         if (__builtin_classify_type (__arg1) != 5 \
 152             && sizeof (__arg1) > SYSCALL_ARG_SIZE) \
 153           __illegally_sized_syscall_arg1 (); \
 154         r3 = _arg1
 155 #define LOADARGS_2(name, __arg1, __arg2) \
 156         long int _arg2 = (long int) (__arg2); \
 157         LOADARGS_1(name, __arg1); \
 158         extern void __illegally_sized_syscall_arg2 (void); \
 159         if (__builtin_classify_type (__arg2) != 5 \
 160             && sizeof (__arg2) > SYSCALL_ARG_SIZE) \
 161           __illegally_sized_syscall_arg2 (); \
 162         r4 = _arg2
 163 #define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 164         long int _arg3 = (long int) (__arg3); \
 165         LOADARGS_2(name, __arg1, __arg2); \
 166         extern void __illegally_sized_syscall_arg3 (void); \
 167         if (__builtin_classify_type (__arg3) != 5 \
 168             && sizeof (__arg3) > SYSCALL_ARG_SIZE) \
 169           __illegally_sized_syscall_arg3 (); \
 170         r5 = _arg3
 171 #define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 172         long int _arg4 = (long int) (__arg4); \
 173         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 174         extern void __illegally_sized_syscall_arg4 (void); \
 175         if (__builtin_classify_type (__arg4) != 5 \
 176             && sizeof (__arg4) > SYSCALL_ARG_SIZE) \
 177           __illegally_sized_syscall_arg4 (); \
 178         r6 = _arg4
 179 #define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 180         long int _arg5 = (long int) (__arg5); \
 181         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 182         extern void __illegally_sized_syscall_arg5 (void); \
 183         if (__builtin_classify_type (__arg5) != 5 \
 184             && sizeof (__arg5) > SYSCALL_ARG_SIZE) \
 185           __illegally_sized_syscall_arg5 (); \
 186         r7 = _arg5
 187 #define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 188         long int _arg6 = (long int) (__arg6); \
 189         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 190         extern void __illegally_sized_syscall_arg6 (void); \
 191         if (__builtin_classify_type (__arg6) != 5 \
 192             && sizeof (__arg6) > SYSCALL_ARG_SIZE) \
 193           __illegally_sized_syscall_arg6 (); \
 194         r8 = _arg6
 195
 196 #define ASM_INPUT_0 "0" (r0)
 197 #define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 198 #define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 199 #define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 200 #define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 201 #define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 202 #define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 203
 204
 205 /* Pointer mangling support.  */
 206 #if IS_IN (rtld)
 207 /* We cannot use the thread descriptor because in ld.so we use setjmp
 208    earlier than the descriptor is initialized.  */
 209 #else
 210 # ifdef __ASSEMBLER__
 211 #  if defined(__PPC64__) || defined(__powerpc64__)
 212 #   define LOAD  ld
 213 #   define TPREG r13
 214 #  else
 215 #   define LOAD  lwz
 216 #   define TPREG r2
 217 #  endif
 218 #  define PTR_MANGLE(reg, tmpreg) \
 219         LOAD    tmpreg,POINTER_GUARD(TPREG); \
 220         xor     reg,tmpreg,reg
 221 #  define PTR_MANGLE2(reg, tmpreg) \
 222         xor     reg,tmpreg,reg
 223 #  define PTR_MANGLE3(destreg, reg, tmpreg) \
 224         LOAD    tmpreg,POINTER_GUARD(TPREG); \
 225         xor     destreg,tmpreg,reg
 226 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 227 #  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
 228 #  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
 229 # else
 230 #  define PTR_MANGLE(var) \
 231   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 232 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 233 # endif
 234 #endif
 235
 236 /* List of system calls which are supported as vsyscalls.  */
 237 #define VDSO_NAME  "LINUX_2.6.15"
 238 #define VDSO_HASH  123718565
 239
 240 #if defined(__PPC64__) || defined(__powerpc64__)
 241 #define HAVE_CLOCK_GETRES64_VSYSCALL    "__kernel_clock_getres"
 242 #define HAVE_CLOCK_GETTIME64_VSYSCALL   "__kernel_clock_gettime"
 243 #else
 244 #define HAVE_CLOCK_GETRES_VSYSCALL      "__kernel_clock_getres"
 245 #define HAVE_CLOCK_GETTIME_VSYSCALL     "__kernel_clock_gettime"
 246 #endif
 247 #define HAVE_GETCPU_VSYSCALL            "__kernel_getcpu"
 248 #define HAVE_TIME_VSYSCALL              "__kernel_time"
 249 #define HAVE_GETTIMEOFDAY_VSYSCALL      "__kernel_gettimeofday"
 250 #define HAVE_GET_TBFREQ                 "__kernel_get_tbfreq"
 251
 252 #if defined(__PPC64__) || defined(__powerpc64__)
 253 # define HAVE_SIGTRAMP_RT64             "__kernel_sigtramp_rt64"
 254 #else
 255 # define HAVE_SIGTRAMP_32               "__kernel_sigtramp32"
 256 # define HAVE_SIGTRAMP_RT32             "__kernel_sigtramp_rt32"
 257 #endif
 258
 259 #endif /* _LINUX_POWERPC_SYSDEP_H  */