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| 1 | /* Copyright (C) 2000-2024 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_MIPS_SYSDEP_H |
| 19 | #define _LINUX_MIPS_SYSDEP_H 1 |
| 20 | |
| 21 | /* There is some commonality. */ |
| 22 | #include <sysdeps/unix/sysv/linux/mips/sysdep.h> |
| 23 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
| 24 | #include <sysdeps/unix/mips/mips64/sysdep.h> |
| 25 | |
| 26 | #include <tls.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 | #ifdef __ASSEMBLER__ |
| 36 | |
| 37 | /* We don't want the label for the error handler to be visible in the symbol |
| 38 | table when we define it here. */ |
| 39 | # undef SYSCALL_ERROR_LABEL |
| 40 | # define SYSCALL_ERROR_LABEL 99b |
| 41 | |
| 42 | #else /* ! __ASSEMBLER__ */ |
| 43 | |
| 44 | #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
| 45 | #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
| 46 | |
| 47 | #if _MIPS_SIM == _ABIN32 |
| 48 | /* Convert X to a long long, without losing any bits if it is one |
| 49 | already or warning if it is a 32-bit pointer. */ |
| 50 | # define ARGIFY(X) ((long long int) (__typeof__ ((X) - (X))) (X)) |
| 51 | typedef long long int __syscall_arg_t; |
| 52 | #else |
| 53 | # define ARGIFY(X) ((long int) (X)) |
| 54 | typedef long int __syscall_arg_t; |
| 55 | #endif |
| 56 | |
| 57 | /* Note that the original Linux syscall restart convention required the |
| 58 | instruction immediately preceding SYSCALL to initialize $v0 with the |
| 59 | syscall number. Then if a restart triggered, $v0 would have been |
| 60 | clobbered by the syscall interrupted, and needed to be reinititalized. |
| 61 | The kernel would decrement the PC by 4 before switching back to the |
| 62 | user mode so that $v0 had been reloaded before SYSCALL was executed |
| 63 | again. This implied the place $v0 was loaded from must have been |
| 64 | preserved across a syscall, e.g. an immediate, static register, stack |
| 65 | slot, etc. |
| 66 | |
| 67 | The convention was relaxed in Linux with a change applied to the kernel |
| 68 | GIT repository as commit 96187fb0bc30cd7919759d371d810e928048249d, that |
| 69 | first appeared in the 2.6.36 release. Since then the kernel has had |
| 70 | code that reloads $v0 upon syscall restart and resumes right at the |
| 71 | SYSCALL instruction, so no special arrangement is needed anymore. |
| 72 | |
| 73 | For backwards compatibility with existing kernel binaries we support |
| 74 | the old convention by choosing the instruction preceding SYSCALL |
| 75 | carefully. This also means we have to force a 32-bit encoding of the |
| 76 | microMIPS MOVE instruction if one is used. */ |
| 77 | |
| 78 | #ifdef __mips_micromips |
| 79 | # define MOVE32 "move32" |
| 80 | #else |
| 81 | # define MOVE32 "move" |
| 82 | #endif |
| 83 | |
| 84 | #undef INTERNAL_SYSCALL |
| 85 | #define INTERNAL_SYSCALL(name, nr, args...) \ |
| 86 | internal_syscall##nr ("li\t%0, %2\t\t\t# " #name "\n\t", \ |
| 87 | "IK" (SYS_ify (name)), \ |
| 88 | 0, args) |
| 89 | |
| 90 | #undef INTERNAL_SYSCALL_NCS |
| 91 | #define INTERNAL_SYSCALL_NCS(number, nr, args...) \ |
| 92 | internal_syscall##nr (MOVE32 "\t%0, %2\n\t", \ |
| 93 | "r" (__s0), \ |
| 94 | number, args) |
| 95 | |
| 96 | #define internal_syscall0(v0_init, input, number, dummy...) \ |
| 97 | ({ \ |
| 98 | long int _sys_result; \ |
| 99 | \ |
| 100 | { \ |
| 101 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 102 | = (number); \ |
| 103 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 104 | register __syscall_arg_t __a3 asm ("$7"); \ |
| 105 | __asm__ volatile ( \ |
| 106 | ".set\tnoreorder\n\t" \ |
| 107 | v0_init \ |
| 108 | "syscall\n\t" \ |
| 109 | ".set reorder" \ |
| 110 | : "=r" (__v0), "=r" (__a3) \ |
| 111 | : input \ |
| 112 | : __SYSCALL_CLOBBERS); \ |
| 113 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 114 | } \ |
| 115 | _sys_result; \ |
| 116 | }) |
| 117 | |
| 118 | #define internal_syscall1(v0_init, input, number, arg1) \ |
| 119 | ({ \ |
| 120 | long int _sys_result; \ |
| 121 | \ |
| 122 | { \ |
| 123 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 124 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 125 | = (number); \ |
| 126 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 127 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 128 | register __syscall_arg_t __a3 asm ("$7"); \ |
| 129 | __asm__ volatile ( \ |
| 130 | ".set\tnoreorder\n\t" \ |
| 131 | v0_init \ |
| 132 | "syscall\n\t" \ |
| 133 | ".set reorder" \ |
| 134 | : "=r" (__v0), "=r" (__a3) \ |
| 135 | : input, "r" (__a0) \ |
| 136 | : __SYSCALL_CLOBBERS); \ |
| 137 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 138 | } \ |
| 139 | _sys_result; \ |
| 140 | }) |
| 141 | |
| 142 | #define internal_syscall2(v0_init, input, number, arg1, arg2) \ |
| 143 | ({ \ |
| 144 | long int _sys_result; \ |
| 145 | \ |
| 146 | { \ |
| 147 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 148 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
| 149 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 150 | = (number); \ |
| 151 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 152 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 153 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
| 154 | register __syscall_arg_t __a3 asm ("$7"); \ |
| 155 | __asm__ volatile ( \ |
| 156 | ".set\tnoreorder\n\t" \ |
| 157 | v0_init \ |
| 158 | "syscall\n\t" \ |
| 159 | ".set\treorder" \ |
| 160 | : "=r" (__v0), "=r" (__a3) \ |
| 161 | : input, "r" (__a0), "r" (__a1) \ |
| 162 | : __SYSCALL_CLOBBERS); \ |
| 163 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 164 | } \ |
| 165 | _sys_result; \ |
| 166 | }) |
| 167 | |
| 168 | #define internal_syscall3(v0_init, input, number, arg1, arg2, arg3) \ |
| 169 | ({ \ |
| 170 | long int _sys_result; \ |
| 171 | \ |
| 172 | { \ |
| 173 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 174 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
| 175 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
| 176 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 177 | = (number); \ |
| 178 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 179 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 180 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
| 181 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
| 182 | register __syscall_arg_t __a3 asm ("$7"); \ |
| 183 | __asm__ volatile ( \ |
| 184 | ".set\tnoreorder\n\t" \ |
| 185 | v0_init \ |
| 186 | "syscall\n\t" \ |
| 187 | ".set\treorder" \ |
| 188 | : "=r" (__v0), "=r" (__a3) \ |
| 189 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ |
| 190 | : __SYSCALL_CLOBBERS); \ |
| 191 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 192 | } \ |
| 193 | _sys_result; \ |
| 194 | }) |
| 195 | |
| 196 | #define internal_syscall4(v0_init, input, number, arg1, arg2, arg3, \ |
| 197 | arg4) \ |
| 198 | ({ \ |
| 199 | long int _sys_result; \ |
| 200 | \ |
| 201 | { \ |
| 202 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 203 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
| 204 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
| 205 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
| 206 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 207 | = (number); \ |
| 208 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 209 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 210 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
| 211 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
| 212 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
| 213 | __asm__ volatile ( \ |
| 214 | ".set\tnoreorder\n\t" \ |
| 215 | v0_init \ |
| 216 | "syscall\n\t" \ |
| 217 | ".set\treorder" \ |
| 218 | : "=r" (__v0), "+r" (__a3) \ |
| 219 | : input, "r" (__a0), "r" (__a1), "r" (__a2) \ |
| 220 | : __SYSCALL_CLOBBERS); \ |
| 221 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 222 | } \ |
| 223 | _sys_result; \ |
| 224 | }) |
| 225 | |
| 226 | #define internal_syscall5(v0_init, input, number, arg1, arg2, arg3, \ |
| 227 | arg4, arg5) \ |
| 228 | ({ \ |
| 229 | long int _sys_result; \ |
| 230 | \ |
| 231 | { \ |
| 232 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 233 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
| 234 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
| 235 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
| 236 | __syscall_arg_t _arg5 = ARGIFY (arg5); \ |
| 237 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 238 | = (number); \ |
| 239 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 240 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 241 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
| 242 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
| 243 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
| 244 | register __syscall_arg_t __a4 asm ("$8") = _arg5; \ |
| 245 | __asm__ volatile ( \ |
| 246 | ".set\tnoreorder\n\t" \ |
| 247 | v0_init \ |
| 248 | "syscall\n\t" \ |
| 249 | ".set\treorder" \ |
| 250 | : "=r" (__v0), "+r" (__a3) \ |
| 251 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4) \ |
| 252 | : __SYSCALL_CLOBBERS); \ |
| 253 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 254 | } \ |
| 255 | _sys_result; \ |
| 256 | }) |
| 257 | |
| 258 | #define internal_syscall6(v0_init, input, number, arg1, arg2, arg3, \ |
| 259 | arg4, arg5, arg6) \ |
| 260 | ({ \ |
| 261 | long int _sys_result; \ |
| 262 | \ |
| 263 | { \ |
| 264 | __syscall_arg_t _arg1 = ARGIFY (arg1); \ |
| 265 | __syscall_arg_t _arg2 = ARGIFY (arg2); \ |
| 266 | __syscall_arg_t _arg3 = ARGIFY (arg3); \ |
| 267 | __syscall_arg_t _arg4 = ARGIFY (arg4); \ |
| 268 | __syscall_arg_t _arg5 = ARGIFY (arg5); \ |
| 269 | __syscall_arg_t _arg6 = ARGIFY (arg6); \ |
| 270 | register __syscall_arg_t __s0 asm ("$16") __attribute__ ((unused))\ |
| 271 | = (number); \ |
| 272 | register __syscall_arg_t __v0 asm ("$2"); \ |
| 273 | register __syscall_arg_t __a0 asm ("$4") = _arg1; \ |
| 274 | register __syscall_arg_t __a1 asm ("$5") = _arg2; \ |
| 275 | register __syscall_arg_t __a2 asm ("$6") = _arg3; \ |
| 276 | register __syscall_arg_t __a3 asm ("$7") = _arg4; \ |
| 277 | register __syscall_arg_t __a4 asm ("$8") = _arg5; \ |
| 278 | register __syscall_arg_t __a5 asm ("$9") = _arg6; \ |
| 279 | __asm__ volatile ( \ |
| 280 | ".set\tnoreorder\n\t" \ |
| 281 | v0_init \ |
| 282 | "syscall\n\t" \ |
| 283 | ".set\treorder" \ |
| 284 | : "=r" (__v0), "+r" (__a3) \ |
| 285 | : input, "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a4), \ |
| 286 | "r" (__a5) \ |
| 287 | : __SYSCALL_CLOBBERS); \ |
| 288 | _sys_result = __a3 != 0 ? -__v0 : __v0; \ |
| 289 | } \ |
| 290 | _sys_result; \ |
| 291 | }) |
| 292 | |
| 293 | #if __mips_isa_rev >= 6 |
| 294 | # define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ |
| 295 | "$14", "$15", "$24", "$25", "memory" |
| 296 | #else |
| 297 | # define __SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ |
| 298 | "$14", "$15", "$24", "$25", "hi", "lo", "memory" |
| 299 | #endif |
| 300 | |
| 301 | #endif /* __ASSEMBLER__ */ |
| 302 | |
| 303 | #endif /* linux/mips/sysdep.h */ |
| 304 |
Warning: That file was not part of the compilation database. It may have many parsing errors.