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| 1 | /* Copyright (C) 2005-2022 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_AARCH64_SYSDEP_H |
| 20 | #define _LINUX_AARCH64_SYSDEP_H 1 |
| 21 | |
| 22 | #include <sysdeps/unix/sysdep.h> |
| 23 | #include <sysdeps/aarch64/sysdep.h> |
| 24 | #include <sysdeps/unix/sysv/linux/generic/sysdep.h> |
| 25 | |
| 26 | /* Defines RTLD_PRIVATE_ERRNO and USE_DL_SYSINFO. */ |
| 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 | /* Linux uses a negative return value to indicate syscall errors, |
| 46 | unlike most Unices, which use the condition codes' carry flag. |
| 47 | |
| 48 | Since version 2.1 the return value of a system call might be |
| 49 | negative even if the call succeeded. E.g., the `lseek' system call |
| 50 | might return a large offset. Therefore we must not anymore test |
| 51 | for < 0, but test for a real error by making sure the value in R0 |
| 52 | is a real error number. Linus said he will make sure the no syscall |
| 53 | returns a value in -1 .. -4095 as a valid result so we can safely |
| 54 | test with -4095. */ |
| 55 | |
| 56 | # undef PSEUDO |
| 57 | # define PSEUDO(name, syscall_name, args) \ |
| 58 | .text; \ |
| 59 | ENTRY (name); \ |
| 60 | DO_CALL (syscall_name, args); \ |
| 61 | cmn x0, #4095; \ |
| 62 | b.cs .Lsyscall_error; |
| 63 | |
| 64 | # undef PSEUDO_END |
| 65 | # define PSEUDO_END(name) \ |
| 66 | SYSCALL_ERROR_HANDLER \ |
| 67 | END (name) |
| 68 | |
| 69 | # undef PSEUDO_NOERRNO |
| 70 | # define PSEUDO_NOERRNO(name, syscall_name, args) \ |
| 71 | .text; \ |
| 72 | ENTRY (name); \ |
| 73 | DO_CALL (syscall_name, args); |
| 74 | |
| 75 | # undef PSEUDO_END_NOERRNO |
| 76 | # define PSEUDO_END_NOERRNO(name) \ |
| 77 | END (name) |
| 78 | |
| 79 | # define ret_NOERRNO ret |
| 80 | |
| 81 | /* The function has to return the error code. */ |
| 82 | # undef PSEUDO_ERRVAL |
| 83 | # define PSEUDO_ERRVAL(name, syscall_name, args) \ |
| 84 | .text; \ |
| 85 | ENTRY (name) \ |
| 86 | DO_CALL (syscall_name, args); \ |
| 87 | neg x0, x0 |
| 88 | |
| 89 | # undef PSEUDO_END_ERRVAL |
| 90 | # define PSEUDO_END_ERRVAL(name) \ |
| 91 | END (name) |
| 92 | |
| 93 | # define ret_ERRVAL ret |
| 94 | |
| 95 | # if !IS_IN (libc) |
| 96 | # define SYSCALL_ERROR .Lsyscall_error |
| 97 | # if RTLD_PRIVATE_ERRNO |
| 98 | # define SYSCALL_ERROR_HANDLER \ |
| 99 | .Lsyscall_error: \ |
| 100 | adrp x1, C_SYMBOL_NAME(rtld_errno); \ |
| 101 | neg w0, w0; \ |
| 102 | str w0, [x1, :lo12:C_SYMBOL_NAME(rtld_errno)]; \ |
| 103 | mov x0, -1; \ |
| 104 | RET; |
| 105 | # else |
| 106 | |
| 107 | # define SYSCALL_ERROR_HANDLER \ |
| 108 | .Lsyscall_error: \ |
| 109 | adrp x1, :gottprel:errno; \ |
| 110 | neg w2, w0; \ |
| 111 | ldr PTR_REG(1), [x1, :gottprel_lo12:errno]; \ |
| 112 | mrs x3, tpidr_el0; \ |
| 113 | mov x0, -1; \ |
| 114 | str w2, [x1, x3]; \ |
| 115 | RET; |
| 116 | # endif |
| 117 | # else |
| 118 | # define SYSCALL_ERROR __syscall_error |
| 119 | # define SYSCALL_ERROR_HANDLER \ |
| 120 | .Lsyscall_error: \ |
| 121 | b __syscall_error; |
| 122 | # endif |
| 123 | |
| 124 | /* Linux takes system call args in registers: |
| 125 | syscall number x8 |
| 126 | arg 1 x0 |
| 127 | arg 2 x1 |
| 128 | arg 3 x2 |
| 129 | arg 4 x3 |
| 130 | arg 5 x4 |
| 131 | arg 6 x5 |
| 132 | arg 7 x6 |
| 133 | |
| 134 | The compiler is going to form a call by coming here, through PSEUDO, with |
| 135 | arguments |
| 136 | syscall number in the DO_CALL macro |
| 137 | arg 1 x0 |
| 138 | arg 2 x1 |
| 139 | arg 3 x2 |
| 140 | arg 4 x3 |
| 141 | arg 5 x4 |
| 142 | arg 6 x5 |
| 143 | arg 7 x6 |
| 144 | |
| 145 | */ |
| 146 | |
| 147 | # undef DO_CALL |
| 148 | # define DO_CALL(syscall_name, args) \ |
| 149 | mov x8, SYS_ify (syscall_name); \ |
| 150 | svc 0 |
| 151 | |
| 152 | #else /* not __ASSEMBLER__ */ |
| 153 | |
| 154 | # ifdef __LP64__ |
| 155 | # define VDSO_NAME "LINUX_2.6.39" |
| 156 | # define VDSO_HASH 123718537 |
| 157 | # else |
| 158 | # define VDSO_NAME "LINUX_4.9" |
| 159 | # define VDSO_HASH 61765625 |
| 160 | # endif |
| 161 | |
| 162 | /* List of system calls which are supported as vsyscalls. */ |
| 163 | # define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres" |
| 164 | # define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime" |
| 165 | # define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday" |
| 166 | |
| 167 | # define SINGLE_THREAD_BY_GLOBAL 1 |
| 168 | |
| 169 | # undef INTERNAL_SYSCALL_RAW |
| 170 | # define INTERNAL_SYSCALL_RAW(name, nr, args...) \ |
| 171 | ({ long _sys_result; \ |
| 172 | { \ |
| 173 | LOAD_ARGS_##nr (args) \ |
| 174 | register long _x8 asm ("x8") = (name); \ |
| 175 | asm volatile ("svc 0 // syscall " # name \ |
| 176 | : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \ |
| 177 | _sys_result = _x0; \ |
| 178 | } \ |
| 179 | _sys_result; }) |
| 180 | |
| 181 | # undef INTERNAL_SYSCALL |
| 182 | # define INTERNAL_SYSCALL(name, nr, args...) \ |
| 183 | INTERNAL_SYSCALL_RAW(SYS_ify(name), nr, args) |
| 184 | |
| 185 | # undef INTERNAL_SYSCALL_AARCH64 |
| 186 | # define INTERNAL_SYSCALL_AARCH64(name, nr, args...) \ |
| 187 | INTERNAL_SYSCALL_RAW(__ARM_NR_##name, nr, args) |
| 188 | |
| 189 | # define LOAD_ARGS_0() \ |
| 190 | register long _x0 asm ("x0"); |
| 191 | # define LOAD_ARGS_1(x0) \ |
| 192 | long _x0tmp = (long) (x0); \ |
| 193 | LOAD_ARGS_0 () \ |
| 194 | _x0 = _x0tmp; |
| 195 | # define LOAD_ARGS_2(x0, x1) \ |
| 196 | long _x1tmp = (long) (x1); \ |
| 197 | LOAD_ARGS_1 (x0) \ |
| 198 | register long _x1 asm ("x1") = _x1tmp; |
| 199 | # define LOAD_ARGS_3(x0, x1, x2) \ |
| 200 | long _x2tmp = (long) (x2); \ |
| 201 | LOAD_ARGS_2 (x0, x1) \ |
| 202 | register long _x2 asm ("x2") = _x2tmp; |
| 203 | # define LOAD_ARGS_4(x0, x1, x2, x3) \ |
| 204 | long _x3tmp = (long) (x3); \ |
| 205 | LOAD_ARGS_3 (x0, x1, x2) \ |
| 206 | register long _x3 asm ("x3") = _x3tmp; |
| 207 | # define LOAD_ARGS_5(x0, x1, x2, x3, x4) \ |
| 208 | long _x4tmp = (long) (x4); \ |
| 209 | LOAD_ARGS_4 (x0, x1, x2, x3) \ |
| 210 | register long _x4 asm ("x4") = _x4tmp; |
| 211 | # define LOAD_ARGS_6(x0, x1, x2, x3, x4, x5) \ |
| 212 | long _x5tmp = (long) (x5); \ |
| 213 | LOAD_ARGS_5 (x0, x1, x2, x3, x4) \ |
| 214 | register long _x5 asm ("x5") = _x5tmp; |
| 215 | # define LOAD_ARGS_7(x0, x1, x2, x3, x4, x5, x6)\ |
| 216 | long _x6tmp = (long) (x6); \ |
| 217 | LOAD_ARGS_6 (x0, x1, x2, x3, x4, x5) \ |
| 218 | register long _x6 asm ("x6") = _x6tmp; |
| 219 | |
| 220 | # define ASM_ARGS_0 |
| 221 | # define ASM_ARGS_1 , "r" (_x0) |
| 222 | # define ASM_ARGS_2 ASM_ARGS_1, "r" (_x1) |
| 223 | # define ASM_ARGS_3 ASM_ARGS_2, "r" (_x2) |
| 224 | # define ASM_ARGS_4 ASM_ARGS_3, "r" (_x3) |
| 225 | # define ASM_ARGS_5 ASM_ARGS_4, "r" (_x4) |
| 226 | # define ASM_ARGS_6 ASM_ARGS_5, "r" (_x5) |
| 227 | # define ASM_ARGS_7 ASM_ARGS_6, "r" (_x6) |
| 228 | |
| 229 | # undef INTERNAL_SYSCALL_NCS |
| 230 | # define INTERNAL_SYSCALL_NCS(number, nr, args...) \ |
| 231 | INTERNAL_SYSCALL_RAW (number, nr, args) |
| 232 | |
| 233 | #undef HAVE_INTERNAL_BRK_ADDR_SYMBOL |
| 234 | #define HAVE_INTERNAL_BRK_ADDR_SYMBOL 1 |
| 235 | |
| 236 | #endif /* __ASSEMBLER__ */ |
| 237 | |
| 238 | /* Pointer mangling is supported for AArch64. */ |
| 239 | #if (IS_IN (rtld) \ |
| 240 | || (!defined SHARED && (IS_IN (libc) \ |
| 241 | || IS_IN (libpthread)))) |
| 242 | # ifdef __ASSEMBLER__ |
| 243 | /* Note, dst, src, guard, and tmp are all register numbers rather than |
| 244 | register names so they will work with both ILP32 and LP64. */ |
| 245 | # define PTR_MANGLE(dst, src, guard, tmp) \ |
| 246 | LDST_PCREL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard_local)); \ |
| 247 | PTR_MANGLE2 (dst, src, guard) |
| 248 | /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */ |
| 249 | # define PTR_MANGLE2(dst, src, guard)\ |
| 250 | eor x##dst, x##src, x##guard |
| 251 | # define PTR_DEMANGLE(dst, src, guard, tmp)\ |
| 252 | PTR_MANGLE (dst, src, guard, tmp) |
| 253 | # define PTR_DEMANGLE2(dst, src, guard)\ |
| 254 | PTR_MANGLE2 (dst, src, guard) |
| 255 | # else |
| 256 | extern uintptr_t __pointer_chk_guard_local attribute_relro attribute_hidden; |
| 257 | # define PTR_MANGLE(var) \ |
| 258 | (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard_local) |
| 259 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| 260 | # endif |
| 261 | #else |
| 262 | # ifdef __ASSEMBLER__ |
| 263 | /* Note, dst, src, guard, and tmp are all register numbers rather than |
| 264 | register names so they will work with both ILP32 and LP64. */ |
| 265 | # define PTR_MANGLE(dst, src, guard, tmp) \ |
| 266 | LDST_GLOBAL (ldr, guard, tmp, C_SYMBOL_NAME(__pointer_chk_guard)); \ |
| 267 | PTR_MANGLE2 (dst, src, guard) |
| 268 | /* Use PTR_MANGLE2 for efficiency if guard is already loaded. */ |
| 269 | # define PTR_MANGLE2(dst, src, guard)\ |
| 270 | eor x##dst, x##src, x##guard |
| 271 | # define PTR_DEMANGLE(dst, src, guard, tmp)\ |
| 272 | PTR_MANGLE (dst, src, guard, tmp) |
| 273 | # define PTR_DEMANGLE2(dst, src, guard)\ |
| 274 | PTR_MANGLE2 (dst, src, guard) |
| 275 | # else |
| 276 | extern uintptr_t __pointer_chk_guard attribute_relro; |
| 277 | # define PTR_MANGLE(var) \ |
| 278 | (var) = (__typeof (var)) ((uintptr_t) (var) ^ __pointer_chk_guard) |
| 279 | # define PTR_DEMANGLE(var) PTR_MANGLE (var) |
| 280 | # endif |
| 281 | #endif |
| 282 | |
| 283 | #endif /* linux/aarch64/sysdep.h */ |
| 284 |
Warning: That file was not part of the compilation database. It may have many parsing errors.