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