/* ===-- 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 */
Codebase Browser
llvm