| /* ===-- assembly.h - libUnwind assembler support macros -------------------=== |
| * |
| * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| * See https://llvm.org/LICENSE.txt for license information. |
| * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| * |
| * ===----------------------------------------------------------------------=== |
| * |
| * This file defines macros for use in libUnwind assembler source. |
| * This file is not part of the interface of this library. |
| * |
| * ===----------------------------------------------------------------------=== |
| */ |
| |
| #ifndef UNWIND_ASSEMBLY_H |
| #define UNWIND_ASSEMBLY_H |
| |
| #if defined(__linux__) && defined(__CET__) |
| #include <cet.h> |
| #define _LIBUNWIND_CET_ENDBR _CET_ENDBR |
| #else |
| #define _LIBUNWIND_CET_ENDBR |
| #endif |
| |
| #if defined(__powerpc64__) |
| #define SEPARATOR ; |
| #define PPC64_OFFS_SRR0 0 |
| #define PPC64_OFFS_CR 272 |
| #define PPC64_OFFS_XER 280 |
| #define PPC64_OFFS_LR 288 |
| #define PPC64_OFFS_CTR 296 |
| #define PPC64_OFFS_VRSAVE 304 |
| #define PPC64_OFFS_FP 312 |
| #define PPC64_OFFS_V 824 |
| #elif defined(__APPLE__) && defined(__aarch64__) |
| #define SEPARATOR %% |
| #elif defined(__riscv) |
| # define RISCV_ISIZE (__riscv_xlen / 8) |
| # define RISCV_FOFFSET (RISCV_ISIZE * 32) |
| # if defined(__riscv_flen) |
| # define RISCV_FSIZE (__riscv_flen / 8) |
| # endif |
| |
| # if __riscv_xlen == 64 |
| # define ILOAD ld |
| # define ISTORE sd |
| # elif __riscv_xlen == 32 |
| # define ILOAD lw |
| # define ISTORE sw |
| # else |
| # error "Unsupported __riscv_xlen" |
| # endif |
| |
| # if defined(__riscv_flen) |
| # if __riscv_flen == 64 |
| # define FLOAD fld |
| # define FSTORE fsd |
| # elif __riscv_flen == 32 |
| # define FLOAD flw |
| # define FSTORE fsw |
| # else |
| # error "Unsupported __riscv_flen" |
| # endif |
| # endif |
| # define SEPARATOR ; |
| #else |
| #define SEPARATOR ; |
| #endif |
| |
| #if defined(__powerpc64__) && (!defined(_CALL_ELF) || _CALL_ELF == 1) && \ |
| !defined(_AIX) |
| #define PPC64_OPD1 .section .opd,"aw",@progbits SEPARATOR |
| #define PPC64_OPD2 SEPARATOR \ |
| .p2align 3 SEPARATOR \ |
| .quad .Lfunc_begin0 SEPARATOR \ |
| .quad .TOC.@tocbase SEPARATOR \ |
| .quad 0 SEPARATOR \ |
| .text SEPARATOR \ |
| .Lfunc_begin0: |
| #else |
| #define PPC64_OPD1 |
| #define PPC64_OPD2 |
| #endif |
| |
| #if defined(__aarch64__) |
| #if defined(__ARM_FEATURE_GCS_DEFAULT) && defined(__ARM_FEATURE_BTI_DEFAULT) |
| // Set BTI, PAC, and GCS gnu property bits |
| #define GNU_PROPERTY 7 |
| // We indirectly branch to __libunwind_Registers_arm64_jumpto from |
| // __unw_phase2_resume, so we need to use bti jc. |
| #define AARCH64_BTI bti jc |
| #elif defined(__ARM_FEATURE_GCS_DEFAULT) |
| // Set GCS gnu property bit |
| #define GNU_PROPERTY 4 |
| #elif defined(__ARM_FEATURE_BTI_DEFAULT) |
| // Set BTI and PAC gnu property bits |
| #define GNU_PROPERTY 3 |
| #define AARCH64_BTI bti c |
| #endif |
| #ifdef GNU_PROPERTY |
| .pushsection ".note.gnu.property", "a" SEPARATOR \ |
| .balign 8 SEPARATOR \ |
| .long 4 SEPARATOR \ |
| .long 0x10 SEPARATOR \ |
| .long 0x5 SEPARATOR \ |
| .asciz "GNU" SEPARATOR \ |
| .long 0xc0000000 SEPARATOR /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ \ |
| .long 4 SEPARATOR \ |
| .long GNU_PROPERTY SEPARATOR \ |
| .long 0 SEPARATOR \ |
| .popsection SEPARATOR |
| #endif |
| #endif |
| #if !defined(AARCH64_BTI) |
| #define AARCH64_BTI |
| #endif |
| |
| #if !defined(__aarch64__) |
| #ifdef __ARM_FEATURE_PAC_DEFAULT |
| .eabi_attribute Tag_PAC_extension, 2 |
| .eabi_attribute Tag_PACRET_use, 1 |
| #endif |
| #ifdef __ARM_FEATURE_BTI_DEFAULT |
| .eabi_attribute Tag_BTI_extension, 1 |
| .eabi_attribute Tag_BTI_use, 1 |
| #endif |
| #endif |
| |
| #define GLUE2(a, b) a ## b |
| #define GLUE(a, b) GLUE2(a, b) |
| #define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name) |
| |
| #if defined(__APPLE__) |
| |
| #define SYMBOL_IS_FUNC(name) |
| #define HIDDEN_SYMBOL(name) .private_extern name |
| #if defined(_LIBUNWIND_HIDE_SYMBOLS) |
| #define EXPORT_SYMBOL(name) HIDDEN_SYMBOL(name) |
| #else |
| #define EXPORT_SYMBOL(name) |
| #endif |
| #define WEAK_ALIAS(name, aliasname) \ |
| .globl SYMBOL_NAME(aliasname) SEPARATOR \ |
| EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) |
| |
| #define NO_EXEC_STACK_DIRECTIVE |
| |
| #elif defined(__ELF__) |
| |
| #if defined(__arm__) |
| #define SYMBOL_IS_FUNC(name) .type name,%function |
| #else |
| #define SYMBOL_IS_FUNC(name) .type name,@function |
| #endif |
| #define HIDDEN_SYMBOL(name) .hidden name |
| #if defined(_LIBUNWIND_HIDE_SYMBOLS) |
| #define EXPORT_SYMBOL(name) HIDDEN_SYMBOL(name) |
| #else |
| #define EXPORT_SYMBOL(name) |
| #endif |
| #define WEAK_SYMBOL(name) .weak name |
| |
| #if defined(__hexagon__) |
| #define WEAK_ALIAS(name, aliasname) \ |
| EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| WEAK_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| .equiv SYMBOL_NAME(aliasname), SYMBOL_NAME(name) |
| #else |
| #define WEAK_ALIAS(name, aliasname) \ |
| EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| WEAK_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) |
| #endif |
| |
| #if defined(__GNU__) || defined(__FreeBSD__) || defined(__Fuchsia__) || \ |
| defined(__linux__) |
| #define NO_EXEC_STACK_DIRECTIVE .section .note.GNU-stack,"",%progbits |
| #else |
| #define NO_EXEC_STACK_DIRECTIVE |
| #endif |
| |
| #elif defined(_WIN32) |
| |
| #define SYMBOL_IS_FUNC(name) \ |
| .def name SEPARATOR \ |
| .scl 2 SEPARATOR \ |
| .type 32 SEPARATOR \ |
| .endef |
| #define EXPORT_SYMBOL2(name) \ |
| .section .drectve,"yn" SEPARATOR \ |
| .ascii "-export:", #name, "\0" SEPARATOR \ |
| .text |
| #if defined(_LIBUNWIND_HIDE_SYMBOLS) |
| #define EXPORT_SYMBOL(name) |
| #else |
| #define EXPORT_SYMBOL(name) EXPORT_SYMBOL2(name) |
| #endif |
| #define HIDDEN_SYMBOL(name) |
| |
| #if defined(__MINGW32__) |
| #define WEAK_ALIAS(name, aliasname) \ |
| .globl SYMBOL_NAME(aliasname) SEPARATOR \ |
| EXPORT_SYMBOL(aliasname) SEPARATOR \ |
| SYMBOL_NAME(aliasname) = SYMBOL_NAME(name) |
| #else |
| #define WEAK_ALIAS3(name, aliasname) \ |
| .section .drectve,"yn" SEPARATOR \ |
| .ascii "-alternatename:", #aliasname, "=", #name, "\0" SEPARATOR \ |
| .text |
| #define WEAK_ALIAS2(name, aliasname) \ |
| WEAK_ALIAS3(name, aliasname) |
| #define WEAK_ALIAS(name, aliasname) \ |
| EXPORT_SYMBOL(SYMBOL_NAME(aliasname)) SEPARATOR \ |
| WEAK_ALIAS2(SYMBOL_NAME(name), SYMBOL_NAME(aliasname)) |
| #endif |
| |
| #define NO_EXEC_STACK_DIRECTIVE |
| |
| #elif defined(__sparc__) |
| |
| #elif defined(_AIX) |
| |
| #if defined(__powerpc64__) |
| #define VBYTE_LEN 8 |
| #define CSECT_ALIGN 3 |
| #else |
| #define VBYTE_LEN 4 |
| #define CSECT_ALIGN 2 |
| #endif |
| |
| // clang-format off |
| #define DEFINE_LIBUNWIND_FUNCTION_AND_WEAK_ALIAS(name, aliasname) \ |
| .csect .text[PR], 2 SEPARATOR \ |
| .csect .name[PR], 2 SEPARATOR \ |
| .globl name[DS] SEPARATOR \ |
| .globl .name[PR] SEPARATOR \ |
| .align 4 SEPARATOR \ |
| .csect name[DS], CSECT_ALIGN SEPARATOR \ |
| aliasname: \ |
| .vbyte VBYTE_LEN, .name[PR] SEPARATOR \ |
| .vbyte VBYTE_LEN, TOC[TC0] SEPARATOR \ |
| .vbyte VBYTE_LEN, 0 SEPARATOR \ |
| .weak aliasname SEPARATOR \ |
| .weak .aliasname SEPARATOR \ |
| .csect .name[PR], 2 SEPARATOR \ |
| .aliasname: \ |
| |
| #define WEAK_ALIAS(name, aliasname) |
| #define NO_EXEC_STACK_DIRECTIVE |
| |
| // clang-format on |
| #else |
| |
| #error Unsupported target |
| |
| #endif |
| |
| #if defined(_AIX) |
| // clang-format off |
| #define DEFINE_LIBUNWIND_FUNCTION(name) \ |
| .globl name[DS] SEPARATOR \ |
| .globl .name SEPARATOR \ |
| .align 4 SEPARATOR \ |
| .csect name[DS], CSECT_ALIGN SEPARATOR \ |
| .vbyte VBYTE_LEN, .name SEPARATOR \ |
| .vbyte VBYTE_LEN, TOC[TC0] SEPARATOR \ |
| .vbyte VBYTE_LEN, 0 SEPARATOR \ |
| .csect .text[PR], 2 SEPARATOR \ |
| .name: |
| // clang-format on |
| #else |
| #define DEFINE_LIBUNWIND_FUNCTION(name) \ |
| .globl SYMBOL_NAME(name) SEPARATOR \ |
| HIDDEN_SYMBOL(SYMBOL_NAME(name)) SEPARATOR \ |
| SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \ |
| PPC64_OPD1 \ |
| SYMBOL_NAME(name): \ |
| PPC64_OPD2 \ |
| AARCH64_BTI |
| #endif |
| |
| #if defined(__arm__) |
| #if !defined(__ARM_ARCH) |
| #define __ARM_ARCH 4 |
| #endif |
| |
| #if defined(__ARM_ARCH_4T__) || __ARM_ARCH >= 5 |
| #define ARM_HAS_BX |
| #endif |
| |
| #ifdef ARM_HAS_BX |
| #define JMP(r) bx r |
| #else |
| #define JMP(r) mov pc, r |
| #endif |
| #endif /* __arm__ */ |
| |
| #if defined(__powerpc__) |
| #define PPC_LEFT_SHIFT(index) << (index) |
| #endif |
| |
| #endif /* UNWIND_ASSEMBLY_H */ |
