sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h

   1 /* Copyright (C) 1992-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _LINUX_POWERPC_SYSDEP_H
  19 #define _LINUX_POWERPC_SYSDEP_H 1
  20
  21 #include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
  22 #include <sysdeps/unix/sysv/linux/sysdep.h>
  23 #include <sysdeps/unix/powerpc/sysdep.h>
  24 #include <tls.h>
  25
  26 /* For Linux we can use the system call table in the header file
  27         /usr/include/asm/unistd.h
  28    of the kernel.  But these symbols do not follow the SYS_* syntax
  29    so we have to redefine the `SYS_ify' macro here.  */
  30 #undef SYS_ify
  31 #define SYS_ify(syscall_name)   __NR_##syscall_name
  32
  33 #ifndef __ASSEMBLER__
  34
  35 # include <errno.h>
  36
  37 /* Define a macro which expands inline into the wrapper code for a VDSO
  38    call. This use is for internal calls that do not need to handle errors
  39    normally. It will never touch errno.
  40    On powerpc a system call basically clobbers the same registers like a
  41    function call, with the exception of LR (which is needed for the
  42    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
  43    an error return status).  */
  44 # define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, type, args...)         \
  45   ({                                                                          \
  46     register void *r0  __asm__ ("r0");                                        \
  47     register long int r3  __asm__ ("r3");                                     \
  48     register long int r4  __asm__ ("r4");                                     \
  49     register long int r5  __asm__ ("r5");                                     \
  50     register long int r6  __asm__ ("r6");                                     \
  51     register long int r7  __asm__ ("r7");                                     \
  52     register long int r8  __asm__ ("r8");                                     \
  53     register long int r9  __asm__ ("r9");                                     \
  54     register long int r10 __asm__ ("r10");                                    \
  55     register long int r11 __asm__ ("r11");                                    \
  56     register long int r12 __asm__ ("r12");                                    \
  57     register type rval  __asm__ ("r3");                                       \
  58     LOADARGS_##nr (funcptr, args);                                            \
  59     __asm__ __volatile__                                                      \
  60       ("mtctr %0\n\t"                                                         \
  61        "bctrl\n\t"                                                            \
  62        "mfcr %0"                                                              \
  63        : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),  "+r" (r7),  \
  64          "+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12)             \
  65        : : "cr0", "ctr", "lr", "memory");                                     \
  66     err = (long int) r0;                                                      \
  67     __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4));             \
  68     rval;                                                                     \
  69   })
  70
  71 #define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
  72   INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, long int, args)
  73
  74 # undef INLINE_SYSCALL
  75 # define INLINE_SYSCALL(name, nr, args...)                              \
  76   ({                                                                    \
  77     INTERNAL_SYSCALL_DECL (sc_err);                                     \
  78     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
  79     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
  80       {                                                                 \
  81         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
  82         sc_ret = -1L;                                                   \
  83       }                                                                 \
  84     sc_ret;                                                             \
  85   })
  86
  87 /* Define a macro which expands inline into the wrapper code for a system
  88    call. This use is for internal calls that do not need to handle errors
  89    normally. It will never touch errno.
  90    On powerpc a system call basically clobbers the same registers like a
  91    function call, with the exception of LR (which is needed for the
  92    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
  93    an error return status).  */
  94
  95 # undef INTERNAL_SYSCALL_DECL
  96 # define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
  97
  98 # undef INTERNAL_SYSCALL
  99 # define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                   \
 100   ({                                                                    \
 101     register long int r0  __asm__ ("r0");                               \
 102     register long int r3  __asm__ ("r3");                               \
 103     register long int r4  __asm__ ("r4");                               \
 104     register long int r5  __asm__ ("r5");                               \
 105     register long int r6  __asm__ ("r6");                               \
 106     register long int r7  __asm__ ("r7");                               \
 107     register long int r8  __asm__ ("r8");                               \
 108     register long int r9  __asm__ ("r9");                               \
 109     register long int r10 __asm__ ("r10");                              \
 110     register long int r11 __asm__ ("r11");                              \
 111     register long int r12 __asm__ ("r12");                              \
 112     LOADARGS_##nr(name, args);                                          \
 113     __asm__ __volatile__                                                \
 114       ("sc   \n\t"                                                      \
 115        "mfcr %0"                                                        \
 116        : "=&r" (r0),                                                    \
 117          "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),  \
 118          "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)  \
 119        : ASM_INPUT_##nr                                                 \
 120        : "cr0", "ctr", "memory");                                       \
 121     err = r0;                                                           \
 122     (int) r3;                                                           \
 123   })
 124 # define INTERNAL_SYSCALL(name, err, nr, args...) \
 125   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
 126
 127 # undef INTERNAL_SYSCALL_ERROR_P
 128 # define INTERNAL_SYSCALL_ERROR_P(val, err) \
 129   ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
 130
 131 # undef INTERNAL_SYSCALL_ERRNO
 132 # define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 133
 134 # define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)  \
 135   ({                                                                          \
 136     type sc_ret = ENOSYS;                                                     \
 137                                                                               \
 138     __typeof (__vdso_##name) vdsop = __vdso_##name;                           \
 139     PTR_DEMANGLE (vdsop);                                                     \
 140     if (vdsop != NULL)                                                        \
 141       sc_ret =                                                                \
 142         INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, nr, type, ##args);           \
 143     else                                                                      \
 144       err = 1 << 28;                                                          \
 145     sc_ret;                                                                   \
 146   })
 147
 148 # define LOADARGS_0(name, dummy)                                              \
 149         r0 = name
 150 # define LOADARGS_1(name, __arg1) \
 151         long int arg1 = (long int) (__arg1);    \
 152   LOADARGS_0(name, 0);                                     \
 153         extern void __illegally_sized_syscall_arg1 (void); \
 154         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
 155           __illegally_sized_syscall_arg1 (); \
 156         r3 = arg1
 157 # define LOADARGS_2(name, __arg1, __arg2) \
 158         long int arg2 = (long int) (__arg2); \
 159         LOADARGS_1(name, __arg1); \
 160         extern void __illegally_sized_syscall_arg2 (void); \
 161         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
 162           __illegally_sized_syscall_arg2 (); \
 163         r4 = arg2
 164 # define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 165         long int arg3 = (long int) (__arg3); \
 166         LOADARGS_2(name, __arg1, __arg2); \
 167         extern void __illegally_sized_syscall_arg3 (void); \
 168         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
 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 && sizeof (__arg4) > 4) \
 176           __illegally_sized_syscall_arg4 (); \
 177         r6 = arg4
 178 # define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 179         long int arg5 = (long int) (__arg5); \
 180         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 181         extern void __illegally_sized_syscall_arg5 (void); \
 182         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
 183           __illegally_sized_syscall_arg5 (); \
 184         r7 = arg5
 185 # define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 186         long int arg6 = (long int) (__arg6); \
 187         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 188         extern void __illegally_sized_syscall_arg6 (void); \
 189         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
 190           __illegally_sized_syscall_arg6 (); \
 191         r8 = arg6
 192
 193 # define ASM_INPUT_0 "0" (r0)
 194 # define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 195 # define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 196 # define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 197 # define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 198 # define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 199 # define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 200
 201 #endif /* __ASSEMBLER__ */
 202
 203
 204 /* Pointer mangling support.  */
 205 #if IS_IN (rtld)
 206 /* We cannot use the thread descriptor because in ld.so we use setjmp
 207    earlier than the descriptor is initialized.  */
 208 #else
 209 # ifdef __ASSEMBLER__
 210 #  define PTR_MANGLE(reg, tmpreg) \
 211         lwz     tmpreg,POINTER_GUARD(r2); \
 212         xor     reg,tmpreg,reg
 213 #  define PTR_MANGLE2(reg, tmpreg) \
 214         xor     reg,tmpreg,reg
 215 #  define PTR_MANGLE3(destreg, reg, tmpreg) \
 216         lwz     tmpreg,POINTER_GUARD(r2); \
 217         xor     destreg,tmpreg,reg
 218 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 219 #  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
 220 #  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
 221 # else
 222 #  define PTR_MANGLE(var) \
 223   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 224 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 225 # endif
 226 #endif
 227
 228 #endif /* linux/powerpc/powerpc32/sysdep.h */