1 /* THREAD_* accessors. i386 version. 2 Copyright (C) 2002-2022 Free Software Foundation, Inc. 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 7 License as published by the Free Software Foundation; either 8 version 2.1 of the 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 /* Read member of the thread descriptor directly. */ 20 #define THREAD_GETMEM(descr, member) \ 21 ({ __typeof (descr->member) __value; \ 22 _Static_assert (sizeof (__value) == 1 \ 23 || sizeof (__value) == 4 \ 24 || sizeof (__value) == 8, \ 25 "size of per-thread data"); \ 26 if (sizeof (__value) == 1) \ 27 asm volatile ("movb %%gs:%P2,%b0" \ 28 : "=q" (__value) \ 29 : "0" (0), "i" (offsetof (struct pthread, member))); \ 30 else if (sizeof (__value) == 4) \ 31 asm volatile ("movl %%gs:%P1,%0" \ 32 : "=r" (__value) \ 33 : "i" (offsetof (struct pthread, member))); \ 34 else /* 8 */ \ 35 { \ 36 asm volatile ("movl %%gs:%P1,%%eax\n\t" \ 37 "movl %%gs:%P2,%%edx" \ 38 : "=A" (__value) \ 39 : "i" (offsetof (struct pthread, member)), \ 40 "i" (offsetof (struct pthread, member) + 4)); \ 41 } \ 42 __value; }) 43 44 /* THREAD_GETMEM already forces a read. */ 45 #define THREAD_GETMEM_VOLATILE(descr, member) THREAD_GETMEM (descr, member) 46 47 /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ 48 #define THREAD_GETMEM_NC(descr, member, idx) \ 49 ({ __typeof (descr->member[0]) __value; \ 50 _Static_assert (sizeof (__value) == 1 \ 51 || sizeof (__value) == 4 \ 52 || sizeof (__value) == 8, \ 53 "size of per-thread data"); \ 54 if (sizeof (__value) == 1) \ 55 asm volatile ("movb %%gs:%P2(%3),%b0" \ 56 : "=q" (__value) \ 57 : "0" (0), "i" (offsetof (struct pthread, member[0])), \ 58 "r" (idx)); \ 59 else if (sizeof (__value) == 4) \ 60 asm volatile ("movl %%gs:%P1(,%2,4),%0" \ 61 : "=r" (__value) \ 62 : "i" (offsetof (struct pthread, member[0])), \ 63 "r" (idx)); \ 64 else /* 8 */ \ 65 { \ 66 asm volatile ("movl %%gs:%P1(,%2,8),%%eax\n\t" \ 67 "movl %%gs:4+%P1(,%2,8),%%edx" \ 68 : "=&A" (__value) \ 69 : "i" (offsetof (struct pthread, member[0])), \ 70 "r" (idx)); \ 71 } \ 72 __value; }) 73 74 75 76 /* Set member of the thread descriptor directly. */ 77 #define THREAD_SETMEM(descr, member, value) \ 78 ({ \ 79 _Static_assert (sizeof (descr->member) == 1 \ 80 || sizeof (descr->member) == 4 \ 81 || sizeof (descr->member) == 8, \ 82 "size of per-thread data"); \ 83 if (sizeof (descr->member) == 1) \ 84 asm volatile ("movb %b0,%%gs:%P1" : \ 85 : "iq" (value), \ 86 "i" (offsetof (struct pthread, member))); \ 87 else if (sizeof (descr->member) == 4) \ 88 asm volatile ("movl %0,%%gs:%P1" : \ 89 : "ir" (value), \ 90 "i" (offsetof (struct pthread, member))); \ 91 else /* 8 */ \ 92 { \ 93 asm volatile ("movl %%eax,%%gs:%P1\n\t" \ 94 "movl %%edx,%%gs:%P2" : \ 95 : "A" ((uint64_t) cast_to_integer (value)), \ 96 "i" (offsetof (struct pthread, member)), \ 97 "i" (offsetof (struct pthread, member) + 4)); \ 98 }}) 99 100 101 /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ 102 #define THREAD_SETMEM_NC(descr, member, idx, value) \ 103 ({ \ 104 _Static_assert (sizeof (descr->member[0]) == 1 \ 105 || sizeof (descr->member[0]) == 4 \ 106 || sizeof (descr->member[0]) == 8, \ 107 "size of per-thread data"); \ 108 if (sizeof (descr->member[0]) == 1) \ 109 asm volatile ("movb %b0,%%gs:%P1(%2)" : \ 110 : "iq" (value), \ 111 "i" (offsetof (struct pthread, member)), \ 112 "r" (idx)); \ 113 else if (sizeof (descr->member[0]) == 4) \ 114 asm volatile ("movl %0,%%gs:%P1(,%2,4)" : \ 115 : "ir" (value), \ 116 "i" (offsetof (struct pthread, member)), \ 117 "r" (idx)); \ 118 else /* 8 */ \ 119 { \ 120 asm volatile ("movl %%eax,%%gs:%P1(,%2,8)\n\t" \ 121 "movl %%edx,%%gs:4+%P1(,%2,8)" : \ 122 : "A" ((uint64_t) cast_to_integer (value)), \ 123 "i" (offsetof (struct pthread, member)), \ 124 "r" (idx)); \ 125 }}) 126