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| 1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | |
| 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 License as |
| 7 | published by the Free Software Foundation; either version 2.1 of the |
| 8 | 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 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _LINUX_MICROBLAZE_SYSDEP_H |
| 20 | #define _LINUX_MICROBLAZE_SYSDEP_H 1 |
| 21 | |
| 22 | #include <sysdeps/unix/sysdep.h> |
| 23 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
| 24 | #include <sysdeps/microblaze/sysdep.h> |
| 25 | |
| 26 | /* Defines RTLD_PRIVATE_ERRNO. */ |
| 27 | #include <dl-sysdep.h> |
| 28 | |
| 29 | #include <tls.h> |
| 30 | |
| 31 | /* In order to get __set_errno() definition in INLINE_SYSCALL. */ |
| 32 | #ifndef __ASSEMBLER__ |
| 33 | # include <errno.h> |
| 34 | #endif |
| 35 | |
| 36 | /* For Linux we can use the system call table in the header file |
| 37 | /usr/include/asm/unistd.h |
| 38 | of the kernel. But these symbols do not follow the SYS_* syntax |
| 39 | so we have to redefine the `SYS_ify' macro here. */ |
| 40 | #undef SYS_ify |
| 41 | #define SYS_ify(syscall_name) __NR_##syscall_name |
| 42 | |
| 43 | #ifdef __ASSEMBLER__ |
| 44 | |
| 45 | /* In microblaze ABI function call arguments are passed in registers |
| 46 | r5...r10. The return value is stored in r3 (or r3:r4 regiters pair). |
| 47 | Linux syscall uses the same convention with the addition that the |
| 48 | syscall number is passed in r12. To enter the kernel "brki r14,8" |
| 49 | instruction is used. |
| 50 | None of the abovementioned registers are presumed across function call |
| 51 | or syscall. |
| 52 | */ |
| 53 | /* Linux uses a negative return value to indicate syscall errors, unlike |
| 54 | most Unices, which use the condition codes' carry flag. |
| 55 | |
| 56 | Since version 2.1 the return value of a system call might be negative |
| 57 | even if the call succeeded. E.g., the `lseek' system call might return |
| 58 | a large offset. Therefore we must not anymore test for < 0, but test |
| 59 | for a real error by making sure the value in %d0 is a real error |
| 60 | number. Linus said he will make sure the no syscall returns a value |
| 61 | in -1 .. -4095 as a valid result so we can savely test with -4095. */ |
| 62 | |
| 63 | /* We don't want the label for the error handler to be visible in the symbol |
| 64 | table when we define it here. */ |
| 65 | # undef SYSCALL_ERROR_LABEL |
| 66 | # ifdef PIC |
| 67 | # define SYSCALL_ERROR_LABEL 0f |
| 68 | # else |
| 69 | # define SYSCALL_ERROR_LABEL __syscall_error |
| 70 | # endif |
| 71 | |
| 72 | # undef PSEUDO |
| 73 | # define PSEUDO(name, syscall_name, args) \ |
| 74 | .text; \ |
| 75 | ENTRY (name) \ |
| 76 | DO_CALL (syscall_name, args); \ |
| 77 | addik r12,r0,-4095; \ |
| 78 | cmpu r12,r12,r3; \ |
| 79 | bgei r12,SYSCALL_ERROR_LABEL; |
| 80 | |
| 81 | # undef PSEUDO_END |
| 82 | # define PSEUDO_END(name) \ |
| 83 | SYSCALL_ERROR_HANDLER; \ |
| 84 | END (name) |
| 85 | |
| 86 | # undef PSEUDO_NOERRNO |
| 87 | # define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| 88 | .text; \ |
| 89 | ENTRY (name) \ |
| 90 | DO_CALL (syscall_name, args); |
| 91 | |
| 92 | # undef PSEUDO_END_NOERRNO |
| 93 | # define PSEUDO_END_NOERRNO(name) \ |
| 94 | END (name) |
| 95 | |
| 96 | /* The function has to return the error code. */ |
| 97 | # undef PSEUDO_ERRVAL |
| 98 | # define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| 99 | .text; \ |
| 100 | ENTRY (name) \ |
| 101 | DO_CALL (syscall_name, args); \ |
| 102 | |
| 103 | # undef PSEUDO_END_ERRVAL |
| 104 | # define PSEUDO_END_ERRVAL(name) \ |
| 105 | END (name) |
| 106 | |
| 107 | # define ret_NOERRNO \ |
| 108 | rtsd r15,8; addk r0,r0,r0; |
| 109 | |
| 110 | # define ret_ERRVAL \ |
| 111 | rtsd r15,8; rsubk r3,r3,r0; |
| 112 | |
| 113 | # ifdef PIC |
| 114 | # define SYSCALL_ERROR_LABEL_DCL 0 |
| 115 | # if RTLD_PRIVATE_ERRNO |
| 116 | # define SYSCALL_ERROR_HANDLER \ |
| 117 | SYSCALL_ERROR_LABEL_DCL: \ |
| 118 | mfs r12,rpc; \ |
| 119 | addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \ |
| 120 | lwi r12,r12,rtld_errno@GOT; \ |
| 121 | rsubk r3,r3,r0; \ |
| 122 | swi r3,r12,0; \ |
| 123 | rtsd r15,8; \ |
| 124 | addik r3,r0,-1; |
| 125 | # else /* !RTLD_PRIVATE_ERRNO. */ |
| 126 | /* Store (-r3) into errno through the GOT. */ |
| 127 | # if defined _LIBC_REENTRANT |
| 128 | # define SYSCALL_ERROR_HANDLER \ |
| 129 | SYSCALL_ERROR_LABEL_DCL: \ |
| 130 | addik r1,r1,-16; \ |
| 131 | swi r15,r1,0; \ |
| 132 | swi r20,r1,8; \ |
| 133 | rsubk r3,r3,r0; \ |
| 134 | swi r3,r1,12; \ |
| 135 | mfs r20,rpc; \ |
| 136 | addik r20,r20,_GLOBAL_OFFSET_TABLE_+8; \ |
| 137 | brlid r15,__errno_location@PLT; \ |
| 138 | nop; \ |
| 139 | lwi r4,r1,12; \ |
| 140 | swi r4,r3,0; \ |
| 141 | lwi r20,r1,8; \ |
| 142 | lwi r15,r1,0; \ |
| 143 | addik r1,r1,16; \ |
| 144 | rtsd r15,8; \ |
| 145 | addik r3,r0,-1; |
| 146 | # else /* !_LIBC_REENTRANT. */ |
| 147 | # define SYSCALL_ERROR_HANDLER \ |
| 148 | SYSCALL_ERROR_LABEL_DCL: \ |
| 149 | mfs r12,rpc; \ |
| 150 | addik r12,r12,_GLOBAL_OFFSET_TABLE_+8; \ |
| 151 | lwi r12,r12,errno@GOT; \ |
| 152 | rsubk r3,r3,r0; \ |
| 153 | swi r3,r12,0; \ |
| 154 | rtsd r15,8; \ |
| 155 | addik r3,r0,-1; |
| 156 | # endif /* _LIBC_REENTRANT. */ |
| 157 | # endif /* RTLD_PRIVATE_ERRNO. */ |
| 158 | # else |
| 159 | # define SYSCALL_ERROR_HANDLER /* Nothing here; code in sysdep.S is used. */ |
| 160 | # endif /* PIC. */ |
| 161 | |
| 162 | # define DO_CALL(syscall_name, args) \ |
| 163 | addik r12,r0,SYS_ify (syscall_name); \ |
| 164 | brki r14,8; \ |
| 165 | addk r0,r0,r0; |
| 166 | |
| 167 | #else /* not __ASSEMBLER__ */ |
| 168 | |
| 169 | /* Define a macro which expands inline into the wrapper code for a system |
| 170 | call. This use is for internal calls that do not need to handle errors |
| 171 | normally. It will never touch errno. This returns just what the kernel |
| 172 | gave back. */ |
| 173 | # undef INTERNAL_SYSCALL |
| 174 | # define INTERNAL_SYSCALL(name, nr, args...) \ |
| 175 | inline_syscall##nr(SYS_ify(name), args) |
| 176 | |
| 177 | # undef INTERNAL_SYSCALL_NCS |
| 178 | # define INTERNAL_SYSCALL_NCS(name, nr, args...) \ |
| 179 | inline_syscall##nr(name, args) |
| 180 | |
| 181 | # define SYSCALL_CLOBBERS_6 "r11", "r4", "memory" |
| 182 | # define SYSCALL_CLOBBERS_5 "r10", SYSCALL_CLOBBERS_6 |
| 183 | # define SYSCALL_CLOBBERS_4 "r9", SYSCALL_CLOBBERS_5 |
| 184 | # define SYSCALL_CLOBBERS_3 "r8", SYSCALL_CLOBBERS_4 |
| 185 | # define SYSCALL_CLOBBERS_2 "r7", SYSCALL_CLOBBERS_3 |
| 186 | # define SYSCALL_CLOBBERS_1 "r6", SYSCALL_CLOBBERS_2 |
| 187 | # define SYSCALL_CLOBBERS_0 "r5", SYSCALL_CLOBBERS_1 |
| 188 | |
| 189 | # define inline_syscall0(name,dummy) \ |
| 190 | ({ \ |
| 191 | register long int __ret __asm__("r3"); \ |
| 192 | register long int __r12 __asm__("r12") = name; \ |
| 193 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 194 | : "=r"(__ret) \ |
| 195 | : "r"(__r12) \ |
| 196 | : SYSCALL_CLOBBERS_0 ); __ret; \ |
| 197 | }) |
| 198 | |
| 199 | # define inline_syscall1(name,arg1) \ |
| 200 | ({ \ |
| 201 | long int __arg1 = (long int) (arg1); \ |
| 202 | register long int __ret __asm__("r3"); \ |
| 203 | register long int __r12 __asm__("r12") = name; \ |
| 204 | register long int __r5 __asm__("r5") = __arg1; \ |
| 205 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 206 | : "=r"(__ret) \ |
| 207 | : "r"(__r5), "r"(__r12) \ |
| 208 | : SYSCALL_CLOBBERS_1 ); __ret; \ |
| 209 | }) |
| 210 | |
| 211 | # define inline_syscall2(name,arg1,arg2) \ |
| 212 | ({ \ |
| 213 | long int __arg1 = (long int) (arg1); \ |
| 214 | long int __arg2 = (long int) (arg2); \ |
| 215 | register long int __ret __asm__("r3"); \ |
| 216 | register long int __r12 __asm__("r12") = name; \ |
| 217 | register long int __r5 __asm__("r5") = __arg1; \ |
| 218 | register long int __r6 __asm__("r6") = __arg2; \ |
| 219 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 220 | : "=r"(__ret) \ |
| 221 | : "r"(__r5), "r"(__r6), "r"(__r12) \ |
| 222 | : SYSCALL_CLOBBERS_2 ); __ret; \ |
| 223 | }) |
| 224 | |
| 225 | |
| 226 | # define inline_syscall3(name,arg1,arg2,arg3) \ |
| 227 | ({ \ |
| 228 | long int __arg1 = (long int) (arg1); \ |
| 229 | long int __arg2 = (long int) (arg2); \ |
| 230 | long int __arg3 = (long int) (arg3); \ |
| 231 | register long int __ret __asm__("r3"); \ |
| 232 | register long int __r12 __asm__("r12") = name; \ |
| 233 | register long int __r5 __asm__("r5") = __arg1; \ |
| 234 | register long int __r6 __asm__("r6") = __arg2; \ |
| 235 | register long int __r7 __asm__("r7") = __arg3; \ |
| 236 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 237 | : "=r"(__ret) \ |
| 238 | : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r12) \ |
| 239 | : SYSCALL_CLOBBERS_3 ); __ret; \ |
| 240 | }) |
| 241 | |
| 242 | |
| 243 | # define inline_syscall4(name,arg1,arg2,arg3,arg4) \ |
| 244 | ({ \ |
| 245 | long int __arg1 = (long int) (arg1); \ |
| 246 | long int __arg2 = (long int) (arg2); \ |
| 247 | long int __arg3 = (long int) (arg3); \ |
| 248 | long int __arg4 = (long int) (arg4); \ |
| 249 | register long int __ret __asm__("r3"); \ |
| 250 | register long int __r12 __asm__("r12") = name; \ |
| 251 | register long int __r5 __asm__("r5") = __arg1; \ |
| 252 | register long int __r6 __asm__("r6") = __arg2; \ |
| 253 | register long int __r7 __asm__("r7") = __arg3; \ |
| 254 | register long int __r8 __asm__("r8") = __arg4; \ |
| 255 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 256 | : "=r"(__ret) \ |
| 257 | : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r12) \ |
| 258 | : SYSCALL_CLOBBERS_4 ); __ret; \ |
| 259 | }) |
| 260 | |
| 261 | |
| 262 | # define inline_syscall5(name,arg1,arg2,arg3,arg4,arg5) \ |
| 263 | ({ \ |
| 264 | long int __arg1 = (long int) (arg1); \ |
| 265 | long int __arg2 = (long int) (arg2); \ |
| 266 | long int __arg3 = (long int) (arg3); \ |
| 267 | long int __arg4 = (long int) (arg4); \ |
| 268 | long int __arg5 = (long int) (arg5); \ |
| 269 | register long int __ret __asm__("r3"); \ |
| 270 | register long int __r12 __asm__("r12") = name; \ |
| 271 | register long int __r5 __asm__("r5") = __arg1; \ |
| 272 | register long int __r6 __asm__("r6") = __arg2; \ |
| 273 | register long int __r7 __asm__("r7") = __arg3; \ |
| 274 | register long int __r8 __asm__("r8") = __arg4; \ |
| 275 | register long int __r9 __asm__("r9") = __arg5; \ |
| 276 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 277 | : "=r"(__ret) \ |
| 278 | : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r12) \ |
| 279 | : SYSCALL_CLOBBERS_5 ); __ret; \ |
| 280 | }) |
| 281 | |
| 282 | |
| 283 | # define inline_syscall6(name,arg1,arg2,arg3,arg4,arg5,arg6) \ |
| 284 | ({ \ |
| 285 | long int __arg1 = (long int) (arg1); \ |
| 286 | long int __arg2 = (long int) (arg2); \ |
| 287 | long int __arg3 = (long int) (arg3); \ |
| 288 | long int __arg4 = (long int) (arg4); \ |
| 289 | long int __arg5 = (long int) (arg5); \ |
| 290 | long int __arg6 = (long int) (arg6); \ |
| 291 | register long int __ret __asm__("r3"); \ |
| 292 | register long int __r12 __asm__("r12") = name; \ |
| 293 | register long int __r5 __asm__("r5") = __arg1; \ |
| 294 | register long int __r6 __asm__("r6") = __arg2; \ |
| 295 | register long int __r7 __asm__("r7") = __arg3; \ |
| 296 | register long int __r8 __asm__("r8") = __arg4; \ |
| 297 | register long int __r9 __asm__("r9") = __arg5; \ |
| 298 | register long int __r10 __asm__("r10") = __arg6; \ |
| 299 | __asm__ __volatile__( "brki r14,8; nop;" \ |
| 300 | : "=r"(__ret) \ |
| 301 | : "r"(__r5), "r"(__r6), "r"(__r7), "r"(__r8),"r"(__r9), "r"(__r10), \ |
| 302 | "r"(__r12) \ |
| 303 | : SYSCALL_CLOBBERS_6 ); __ret; \ |
| 304 | }) |
| 305 | |
| 306 | |
| 307 | /* Pointer mangling is not yet supported for Microblaze. */ |
| 308 | # define PTR_MANGLE(var) (void) (var) |
| 309 | # define PTR_DEMANGLE(var) (void) (var) |
| 310 | |
| 311 | # define SINGLE_THREAD_BY_GLOBAL 1 |
| 312 | |
| 313 | #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
| 314 | #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
| 315 | |
| 316 | #endif /* not __ASSEMBLER__ */ |
| 317 | |
| 318 | #endif /* _LINUX_MICROBLAZE_SYSDEP_H */ |
| 319 |
Warning: That file was not part of the compilation database. It may have many parsing errors.