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| 1 | /* Copyright (C) 1992-2022 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_SH_SYSDEP_H |
| 19 | #define _LINUX_SH_SYSDEP_H 1 |
| 20 | |
| 21 | /* There is some commonality. */ |
| 22 | #include <sysdeps/unix/sysv/linux/sysdep.h> |
| 23 | #include <sysdeps/unix/sh/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 | |
| 34 | #ifdef __ASSEMBLER__ |
| 35 | |
| 36 | /* Linux uses a negative return value to indicate syscall errors, |
| 37 | unlike most Unices, which use the condition codes' carry flag. |
| 38 | |
| 39 | Since version 2.1 the return value of a system call might be |
| 40 | negative even if the call succeeded. E.g., the `lseek' system call |
| 41 | might return a large offset. Therefore we must not anymore test |
| 42 | for < 0, but test for a real error by making sure the value in R0 |
| 43 | is a real error number. Linus said he will make sure the no syscall |
| 44 | returns a value in -1 .. -4095 as a valid result so we can savely |
| 45 | test with -4095. */ |
| 46 | |
| 47 | #define _IMM1 #-1 |
| 48 | #define _IMM12 #-12 |
| 49 | #undef PSEUDO |
| 50 | #define PSEUDO(name, syscall_name, args) \ |
| 51 | .text; \ |
| 52 | ENTRY (name); \ |
| 53 | DO_CALL (syscall_name, args); \ |
| 54 | mov r0,r1; \ |
| 55 | mov _IMM12,r2; \ |
| 56 | shad r2,r1; \ |
| 57 | not r1,r1; \ |
| 58 | tst r1,r1; \ |
| 59 | bf .Lpseudo_end; \ |
| 60 | SYSCALL_ERROR_HANDLER; \ |
| 61 | .Lpseudo_end: |
| 62 | |
| 63 | #undef PSEUDO_END |
| 64 | #define PSEUDO_END(name) \ |
| 65 | END (name) |
| 66 | |
| 67 | #undef PSEUDO_NOERRNO |
| 68 | #define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| 69 | .text; \ |
| 70 | ENTRY (name); \ |
| 71 | DO_CALL (syscall_name, args) |
| 72 | |
| 73 | #undef PSEUDO_END_NOERRNO |
| 74 | #define PSEUDO_END_NOERRNO(name) \ |
| 75 | END (name) |
| 76 | |
| 77 | #define ret_NOERRNO ret |
| 78 | |
| 79 | #define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| 80 | .text; \ |
| 81 | ENTRY (name); \ |
| 82 | DO_CALL (syscall_name, args); |
| 83 | |
| 84 | #undef PSEUDO_END_ERRVAL |
| 85 | #define PSEUDO_END_ERRVAL(name) \ |
| 86 | END (name) |
| 87 | |
| 88 | #define ret_ERRVAL ret |
| 89 | |
| 90 | #ifndef PIC |
| 91 | # define SYSCALL_ERROR_HANDLER \ |
| 92 | mov.l 0f,r1; \ |
| 93 | jmp @r1; \ |
| 94 | mov r0,r4; \ |
| 95 | .align 2; \ |
| 96 | 0: .long __syscall_error |
| 97 | #else |
| 98 | # if RTLD_PRIVATE_ERRNO |
| 99 | # define SYSCALL_ERROR_HANDLER \ |
| 100 | neg r0,r1; \ |
| 101 | mov r12,r2; \ |
| 102 | cfi_register (r12, r2); \ |
| 103 | mov.l 0f,r12; \ |
| 104 | mova 0f,r0; \ |
| 105 | add r0,r12; \ |
| 106 | mov.l 1f,r0; \ |
| 107 | mov.l r1,@(r0,r12); \ |
| 108 | mov r2,r12; \ |
| 109 | cfi_restore (r12); \ |
| 110 | bra .Lpseudo_end; \ |
| 111 | mov _IMM1,r0; \ |
| 112 | .align 2; \ |
| 113 | 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 114 | 1: .long rtld_errno@GOTOFF |
| 115 | |
| 116 | # elif defined _LIBC_REENTRANT |
| 117 | |
| 118 | # if IS_IN (libc) |
| 119 | # define SYSCALL_ERROR_ERRNO __libc_errno |
| 120 | # else |
| 121 | # define SYSCALL_ERROR_ERRNO errno |
| 122 | # endif |
| 123 | # define SYSCALL_ERROR_HANDLER \ |
| 124 | neg r0,r1; \ |
| 125 | mov r12,r2; \ |
| 126 | cfi_register (r12, r2); \ |
| 127 | mov.l 0f,r12; \ |
| 128 | mova 0f,r0; \ |
| 129 | add r0,r12; \ |
| 130 | mov.l 1f,r0; \ |
| 131 | stc gbr, r4; \ |
| 132 | mov.l @(r0,r12),r0; \ |
| 133 | mov r2,r12; \ |
| 134 | cfi_restore (r12); \ |
| 135 | add r4,r0; \ |
| 136 | mov.l r1,@r0; \ |
| 137 | bra .Lpseudo_end; \ |
| 138 | mov _IMM1,r0; \ |
| 139 | .align 2; \ |
| 140 | 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 141 | 1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF |
| 142 | # else |
| 143 | /* Store (-r0) into errno through the GOT. */ |
| 144 | # define SYSCALL_ERROR_HANDLER \ |
| 145 | neg r0,r1; \ |
| 146 | mov r12,r2; \ |
| 147 | cfi_register (r12, r2); \ |
| 148 | mov.l 0f,r12; \ |
| 149 | mova 0f,r0; \ |
| 150 | add r0,r12; \ |
| 151 | mov.l 1f,r0; \ |
| 152 | mov.l @(r0,r12),r0; \ |
| 153 | mov r2,r12; \ |
| 154 | cfi_restore (r12); \ |
| 155 | mov.l r1,@r0; \ |
| 156 | bra .Lpseudo_end; \ |
| 157 | mov _IMM1,r0; \ |
| 158 | .align 2; \ |
| 159 | 0: .long _GLOBAL_OFFSET_TABLE_; \ |
| 160 | 1: .long errno@GOT |
| 161 | # endif /* _LIBC_REENTRANT */ |
| 162 | #endif /* PIC */ |
| 163 | |
| 164 | # ifdef NEED_SYSCALL_INST_PAD |
| 165 | # define SYSCALL_INST_PAD \ |
| 166 | or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0 |
| 167 | # else |
| 168 | # define SYSCALL_INST_PAD |
| 169 | # endif |
| 170 | |
| 171 | #define SYSCALL_INST0 trapa #0x10 |
| 172 | #define SYSCALL_INST1 trapa #0x11 |
| 173 | #define SYSCALL_INST2 trapa #0x12 |
| 174 | #define SYSCALL_INST3 trapa #0x13 |
| 175 | #define SYSCALL_INST4 trapa #0x14 |
| 176 | #define SYSCALL_INST5 mov.l @(0,r15),r0; trapa #0x15 |
| 177 | #define SYSCALL_INST6 mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16 |
| 178 | |
| 179 | #undef DO_CALL |
| 180 | #define DO_CALL(syscall_name, args) \ |
| 181 | mov.l 1f,r3; \ |
| 182 | SYSCALL_INST##args; \ |
| 183 | SYSCALL_INST_PAD; \ |
| 184 | bra 2f; \ |
| 185 | nop; \ |
| 186 | .align 2; \ |
| 187 | 1: .long SYS_ify (syscall_name); \ |
| 188 | 2: |
| 189 | |
| 190 | #else /* not __ASSEMBLER__ */ |
| 191 | |
| 192 | #define SYSCALL_INST_STR0 "trapa #0x10\n\t" |
| 193 | #define SYSCALL_INST_STR1 "trapa #0x11\n\t" |
| 194 | #define SYSCALL_INST_STR2 "trapa #0x12\n\t" |
| 195 | #define SYSCALL_INST_STR3 "trapa #0x13\n\t" |
| 196 | #define SYSCALL_INST_STR4 "trapa #0x14\n\t" |
| 197 | #define SYSCALL_INST_STR5 "trapa #0x15\n\t" |
| 198 | #define SYSCALL_INST_STR6 "trapa #0x16\n\t" |
| 199 | |
| 200 | # ifdef NEED_SYSCALL_INST_PAD |
| 201 | # define SYSCALL_INST_PAD "\ |
| 202 | or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" |
| 203 | # else |
| 204 | # define SYSCALL_INST_PAD |
| 205 | # endif |
| 206 | |
| 207 | #define ASMFMT_0 |
| 208 | #define ASMFMT_1 \ |
| 209 | , "r" (r4) |
| 210 | #define ASMFMT_2 \ |
| 211 | , "r" (r4), "r" (r5) |
| 212 | #define ASMFMT_3 \ |
| 213 | , "r" (r4), "r" (r5), "r" (r6) |
| 214 | #define ASMFMT_4 \ |
| 215 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7) |
| 216 | #define ASMFMT_5 \ |
| 217 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0) |
| 218 | #define ASMFMT_6 \ |
| 219 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1) |
| 220 | #define ASMFMT_7 \ |
| 221 | , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2) |
| 222 | |
| 223 | #define SUBSTITUTE_ARGS_0() |
| 224 | #define SUBSTITUTE_ARGS_1(arg1) \ |
| 225 | long int _arg1 = (long int) (arg1); \ |
| 226 | register long int r4 asm ("%r4") = (long int) (_arg1) |
| 227 | #define SUBSTITUTE_ARGS_2(arg1, arg2) \ |
| 228 | long int _arg1 = (long int) (arg1); \ |
| 229 | long int _arg2 = (long int) (arg2); \ |
| 230 | register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| 231 | register long int r5 asm ("%r5") = (long int) (_arg2) |
| 232 | #define SUBSTITUTE_ARGS_3(arg1, arg2, arg3) \ |
| 233 | long int _arg1 = (long int) (arg1); \ |
| 234 | long int _arg2 = (long int) (arg2); \ |
| 235 | long int _arg3 = (long int) (arg3); \ |
| 236 | register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| 237 | register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| 238 | register long int r6 asm ("%r6") = (long int) (_arg3) |
| 239 | #define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4) \ |
| 240 | long int _arg1 = (long int) (arg1); \ |
| 241 | long int _arg2 = (long int) (arg2); \ |
| 242 | long int _arg3 = (long int) (arg3); \ |
| 243 | long int _arg4 = (long int) (arg4); \ |
| 244 | register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| 245 | register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| 246 | register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| 247 | register long int r7 asm ("%r7") = (long int) (_arg4) |
| 248 | #define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5) \ |
| 249 | long int _arg1 = (long int) (arg1); \ |
| 250 | long int _arg2 = (long int) (arg2); \ |
| 251 | long int _arg3 = (long int) (arg3); \ |
| 252 | long int _arg4 = (long int) (arg4); \ |
| 253 | long int _arg5 = (long int) (arg5); \ |
| 254 | register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| 255 | register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| 256 | register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| 257 | register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| 258 | register long int r0 asm ("%r0") = (long int) (_arg5) |
| 259 | #define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6) \ |
| 260 | long int _arg1 = (long int) (arg1); \ |
| 261 | long int _arg2 = (long int) (arg2); \ |
| 262 | long int _arg3 = (long int) (arg3); \ |
| 263 | long int _arg4 = (long int) (arg4); \ |
| 264 | long int _arg5 = (long int) (arg5); \ |
| 265 | long int _arg6 = (long int) (arg6); \ |
| 266 | register long int r4 asm ("%r4") = (long int)(_arg1); \ |
| 267 | register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| 268 | register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| 269 | register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| 270 | register long int r0 asm ("%r0") = (long int) (_arg5); \ |
| 271 | register long int r1 asm ("%r1") = (long int) (_arg6) |
| 272 | #define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ |
| 273 | long int _arg1 = (long int) (arg1); \ |
| 274 | long int _arg2 = (long int) (arg2); \ |
| 275 | long int _arg3 = (long int) (arg3); \ |
| 276 | long int _arg4 = (long int) (arg4); \ |
| 277 | long int _arg5 = (long int) (arg5); \ |
| 278 | long int _arg6 = (long int) (arg6); \ |
| 279 | long int _arg7 = (long int) (arg7); \ |
| 280 | register long int r4 asm ("%r4") = (long int) (_arg1); \ |
| 281 | register long int r5 asm ("%r5") = (long int) (_arg2); \ |
| 282 | register long int r6 asm ("%r6") = (long int) (_arg3); \ |
| 283 | register long int r7 asm ("%r7") = (long int) (_arg4); \ |
| 284 | register long int r0 asm ("%r0") = (long int) (_arg5); \ |
| 285 | register long int r1 asm ("%r1") = (long int) (_arg6); \ |
| 286 | register long int r2 asm ("%r2") = (long int) (_arg7) |
| 287 | |
| 288 | #undef INTERNAL_SYSCALL |
| 289 | #define INTERNAL_SYSCALL(name, nr, args...) \ |
| 290 | ({ \ |
| 291 | unsigned long int resultvar; \ |
| 292 | register long int r3 asm ("%r3") = SYS_ify (name); \ |
| 293 | SUBSTITUTE_ARGS_##nr(args); \ |
| 294 | \ |
| 295 | asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ |
| 296 | : "=z" (resultvar) \ |
| 297 | : "r" (r3) ASMFMT_##nr \ |
| 298 | : "memory", "t"); \ |
| 299 | \ |
| 300 | (int) resultvar; }) |
| 301 | |
| 302 | /* The _NCS variant allows non-constant syscall numbers. */ |
| 303 | #define INTERNAL_SYSCALL_NCS(name, nr, args...) \ |
| 304 | ({ \ |
| 305 | unsigned long int resultvar; \ |
| 306 | register long int r3 asm ("%r3") = (name); \ |
| 307 | SUBSTITUTE_ARGS_##nr(args); \ |
| 308 | \ |
| 309 | asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD \ |
| 310 | : "=z" (resultvar) \ |
| 311 | : "r" (r3) ASMFMT_##nr \ |
| 312 | : "memory", "t"); \ |
| 313 | \ |
| 314 | (int) resultvar; }) |
| 315 | |
| 316 | #endif /* __ASSEMBLER__ */ |
| 317 | |
| 318 | /* Pointer mangling support. */ |
| 319 | #if IS_IN (rtld) |
| 320 | /* We cannot use the thread descriptor because in ld.so we use setjmp |
| 321 | earlier than the descriptor is initialized. Using a global variable |
| 322 | is too complicated here since we have no PC-relative addressing mode. */ |
| 323 | #else |
| 324 | # ifdef __ASSEMBLER__ |
| 325 | # define PTR_MANGLE(reg, tmp) \ |
| 326 | stc gbr,tmp; mov.l @(POINTER_GUARD,tmp),tmp; xor tmp,reg |
| 327 | # define PTR_MANGLE2(reg, tmp) xor tmp,reg |
| 328 | # define PTR_DEMANGLE(reg, tmp) PTR_MANGLE (reg, tmp) |
| 329 | # define PTR_DEMANGLE2(reg, tmp) PTR_MANGLE2 (reg, tmp) |
| 330 | # else |
| 331 | # define PTR_MANGLE(var) \ |
| 332 | (var) = (void *) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ()) |
| 333 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| 334 | # endif |
| 335 | #endif |
| 336 | |
| 337 | #endif /* linux/sh/sysdep.h */ |
| 338 |
Warning: That file was not part of the compilation database. It may have many parsing errors.