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

   1 /* Copyright (C) 1992-2015 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _LINUX_POWERPC_SYSDEP_H
  19 #define _LINUX_POWERPC_SYSDEP_H 1
  20
  21 #include <sysdeps/unix/powerpc/sysdep.h>
  22 #include <tls.h>
  23
  24 /* Some systen calls got renamed over time, but retained the same semantics.
  25    Handle them here so they can be catched by both C and assembler stubs in
  26    glibc.  */
  27
  28 #ifdef __NR_pread64
  29 # ifdef __NR_pread
  30 #  error "__NR_pread and __NR_pread64 both defined???"
  31 # endif
  32 # define __NR_pread __NR_pread64
  33 #endif
  34
  35 #ifdef __NR_pwrite64
  36 # ifdef __NR_pwrite
  37 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  38 # endif
  39 # define __NR_pwrite __NR_pwrite64
  40 #endif
  41
  42 /* For Linux we can use the system call table in the header file
  43         /usr/include/asm/unistd.h
  44    of the kernel.  But these symbols do not follow the SYS_* syntax
  45    so we have to redefine the `SYS_ify' macro here.  */
  46 #undef SYS_ify
  47 #define SYS_ify(syscall_name)   __NR_##syscall_name
  48
  49 #ifndef __ASSEMBLER__
  50
  51 # include <errno.h>
  52
  53 /* Define a macro which expands inline into the wrapper code for a VDSO
  54    call. This use is for internal calls that do not need to handle errors
  55    normally. It will never touch errno.
  56    On powerpc a system call basically clobbers the same registers like a
  57    function call, with the exception of LR (which is needed for the
  58    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
  59    an error return status).  */
  60 # define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, type, args...)         \
  61   ({                                                                          \
  62     register void *r0  __asm__ ("r0");                                        \
  63     register long int r3  __asm__ ("r3");                                     \
  64     register long int r4  __asm__ ("r4");                                     \
  65     register long int r5  __asm__ ("r5");                                     \
  66     register long int r6  __asm__ ("r6");                                     \
  67     register long int r7  __asm__ ("r7");                                     \
  68     register long int r8  __asm__ ("r8");                                     \
  69     register long int r9  __asm__ ("r9");                                     \
  70     register long int r10 __asm__ ("r10");                                    \
  71     register long int r11 __asm__ ("r11");                                    \
  72     register long int r12 __asm__ ("r12");                                    \
  73     register type rval  __asm__ ("r3");                                       \
  74     LOADARGS_##nr (funcptr, args);                                            \
  75     __asm__ __volatile__                                                      \
  76       ("mtctr %0\n\t"                                                         \
  77        "bctrl\n\t"                                                            \
  78        "mfcr %0"                                                              \
  79        : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),  "+r" (r7),  \
  80          "+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12)             \
  81        : : "cr0", "ctr", "lr", "memory");                                     \
  82     err = (long int) r0;                                                      \
  83     __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4));             \
  84     rval;                                                                     \
  85   })
  86
  87 #define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
  88   INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, nr, long int, args)
  89
  90 # undef INLINE_SYSCALL
  91 # define INLINE_SYSCALL(name, nr, args...)                              \
  92   ({                                                                    \
  93     INTERNAL_SYSCALL_DECL (sc_err);                                     \
  94     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
  95     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
  96       {                                                                 \
  97         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
  98         sc_ret = -1L;                                                   \
  99       }                                                                 \
 100     sc_ret;                                                             \
 101   })
 102
 103 /* Define a macro which expands inline into the wrapper code for a system
 104    call. This use is for internal calls that do not need to handle errors
 105    normally. It will never touch errno.
 106    On powerpc a system call basically clobbers the same registers like a
 107    function call, with the exception of LR (which is needed for the
 108    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
 109    an error return status).  */
 110
 111 # undef INTERNAL_SYSCALL_DECL
 112 # define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
 113
 114 # undef INTERNAL_SYSCALL
 115 # define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                   \
 116   ({                                                                    \
 117     register long int r0  __asm__ ("r0");                               \
 118     register long int r3  __asm__ ("r3");                               \
 119     register long int r4  __asm__ ("r4");                               \
 120     register long int r5  __asm__ ("r5");                               \
 121     register long int r6  __asm__ ("r6");                               \
 122     register long int r7  __asm__ ("r7");                               \
 123     register long int r8  __asm__ ("r8");                               \
 124     register long int r9  __asm__ ("r9");                               \
 125     register long int r10 __asm__ ("r10");                              \
 126     register long int r11 __asm__ ("r11");                              \
 127     register long int r12 __asm__ ("r12");                              \
 128     LOADARGS_##nr(name, args);                                          \
 129     ABORT_TRANSACTION;                                                  \
 130     __asm__ __volatile__                                                \
 131       ("sc   \n\t"                                                      \
 132        "mfcr %0"                                                        \
 133        : "=&r" (r0),                                                    \
 134          "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),  \
 135          "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)  \
 136        : ASM_INPUT_##nr                                                 \
 137        : "cr0", "ctr", "memory");                                       \
 138     err = r0;                                                           \
 139     (int) r3;                                                           \
 140   })
 141 # define INTERNAL_SYSCALL(name, err, nr, args...) \
 142   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
 143
 144 # undef INTERNAL_SYSCALL_ERROR_P
 145 # define INTERNAL_SYSCALL_ERROR_P(val, err) \
 146   ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
 147
 148 # undef INTERNAL_SYSCALL_ERRNO
 149 # define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 150
 151 # define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)  \
 152   ({                                                                          \
 153     type sc_ret = ENOSYS;                                                     \
 154                                                                               \
 155     __typeof (__vdso_##name) vdsop = __vdso_##name;                           \
 156     PTR_DEMANGLE (vdsop);                                                     \
 157     if (vdsop != NULL)                                                        \
 158       sc_ret =                                                                \
 159         INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, nr, type, ##args);           \
 160     else                                                                      \
 161       err = 1 << 28;                                                          \
 162     sc_ret;                                                                   \
 163   })
 164
 165 /* List of system calls which are supported as vsyscalls.  */
 166 # define HAVE_CLOCK_GETRES_VSYSCALL     1
 167 # define HAVE_CLOCK_GETTIME_VSYSCALL    1
 168
 169
 170 # define LOADARGS_0(name, dummy)                                              \
 171         r0 = name
 172 # define LOADARGS_1(name, __arg1) \
 173         long int arg1 = (long int) (__arg1);    \
 174   LOADARGS_0(name, 0);                                     \
 175         extern void __illegally_sized_syscall_arg1 (void); \
 176         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
 177           __illegally_sized_syscall_arg1 (); \
 178         r3 = arg1
 179 # define LOADARGS_2(name, __arg1, __arg2) \
 180         long int arg2 = (long int) (__arg2); \
 181         LOADARGS_1(name, __arg1); \
 182         extern void __illegally_sized_syscall_arg2 (void); \
 183         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
 184           __illegally_sized_syscall_arg2 (); \
 185         r4 = arg2
 186 # define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 187         long int arg3 = (long int) (__arg3); \
 188         LOADARGS_2(name, __arg1, __arg2); \
 189         extern void __illegally_sized_syscall_arg3 (void); \
 190         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
 191           __illegally_sized_syscall_arg3 (); \
 192         r5 = arg3
 193 # define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 194         long int arg4 = (long int) (__arg4); \
 195         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 196         extern void __illegally_sized_syscall_arg4 (void); \
 197         if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
 198           __illegally_sized_syscall_arg4 (); \
 199         r6 = arg4
 200 # define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 201         long int arg5 = (long int) (__arg5); \
 202         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 203         extern void __illegally_sized_syscall_arg5 (void); \
 204         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
 205           __illegally_sized_syscall_arg5 (); \
 206         r7 = arg5
 207 # define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 208         long int arg6 = (long int) (__arg6); \
 209         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 210         extern void __illegally_sized_syscall_arg6 (void); \
 211         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
 212           __illegally_sized_syscall_arg6 (); \
 213         r8 = arg6
 214
 215 # define ASM_INPUT_0 "0" (r0)
 216 # define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 217 # define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 218 # define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 219 # define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 220 # define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 221 # define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 222
 223 #endif /* __ASSEMBLER__ */
 224
 225
 226 /* Pointer mangling support.  */
 227 #if IS_IN (rtld)
 228 /* We cannot use the thread descriptor because in ld.so we use setjmp
 229    earlier than the descriptor is initialized.  */
 230 #else
 231 # ifdef __ASSEMBLER__
 232 #  define PTR_MANGLE(reg, tmpreg) \
 233         lwz     tmpreg,POINTER_GUARD(r2); \
 234         xor     reg,tmpreg,reg
 235 #  define PTR_MANGLE2(reg, tmpreg) \
 236         xor     reg,tmpreg,reg
 237 #  define PTR_MANGLE3(destreg, reg, tmpreg) \
 238         lwz     tmpreg,POINTER_GUARD(r2); \
 239         xor     destreg,tmpreg,reg
 240 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 241 #  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
 242 #  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
 243 # else
 244 #  define PTR_MANGLE(var) \
 245   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 246 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 247 # endif
 248 #endif
 249
 250 #endif /* linux/powerpc/powerpc32/sysdep.h */