| /* | |
| * Copyright (C) 2024 The Android Open Source Project | |
| * All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions | |
| * are met: | |
| * * Redistributions of source code must retain the above copyright | |
| * notice, this list of conditions and the following disclaimer. | |
| * * Redistributions in binary form must reproduce the above copyright | |
| * notice, this list of conditions and the following disclaimer in | |
| * the documentation and/or other materials provided with the | |
| * distribution. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
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| * SUCH DAMAGE. | |
| */ | |
| #pragma once | |
| #if defined(__riscv) | |
| // TLS_DTV_OFFSET is a constant used in relocation fields, defined in RISC-V ELF Specification[1] | |
| // The front of the TCB contains a pointer to the DTV, and each pointer in DTV | |
| // points to 0x800 past the start of a TLS block to make full use of the range | |
| // of load/store instructions, refer to [2]. | |
| // | |
| // [1]: RISC-V ELF Specification. | |
| // https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#constants | |
| // [2]: Documentation of TLS data structures | |
| // https://github.com/riscv-non-isa/riscv-elf-psabi-doc/issues/53 | |
| #define TLS_DTV_OFFSET 0x800 | |
| #else | |
| #define TLS_DTV_OFFSET 0 | |
| #endif |