/* ===-- 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 #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 */