287 lines
10 KiB
C
287 lines
10 KiB
C
//===-- assembly.h - compiler-rt 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 compiler-rt 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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#ifndef COMPILERRT_ASSEMBLY_H
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#define COMPILERRT_ASSEMBLY_H
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#if defined(__APPLE__) && defined(__aarch64__)
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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(__APPLE__)
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#define HIDDEN(name) .private_extern name
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#define LOCAL_LABEL(name) L_##name
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// tell linker it can break up file at label boundaries
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#define FILE_LEVEL_DIRECTIVE .subsections_via_symbols
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#define SYMBOL_IS_FUNC(name)
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#define CONST_SECTION .const
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#define NO_EXEC_STACK_DIRECTIVE
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#elif defined(__ELF__)
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#define HIDDEN(name) .hidden name
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#define LOCAL_LABEL(name) .L_##name
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#define FILE_LEVEL_DIRECTIVE
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#if defined(__arm__) || defined(__aarch64__)
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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 CONST_SECTION .section .rodata
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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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#else // !__APPLE__ && !__ELF__
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#define HIDDEN(name)
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#define LOCAL_LABEL(name) .L ## name
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#define FILE_LEVEL_DIRECTIVE
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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 CONST_SECTION .section .rdata,"rd"
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#define NO_EXEC_STACK_DIRECTIVE
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#endif
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#if defined(__arm__) || defined(__aarch64__)
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#define FUNC_ALIGN \
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.text SEPARATOR \
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.balign 16 SEPARATOR
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#else
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#define FUNC_ALIGN
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#endif
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// BTI and PAC gnu property note
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#define NT_GNU_PROPERTY_TYPE_0 5
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#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
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#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 1
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#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 2
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#if defined(__ARM_FEATURE_BTI_DEFAULT)
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#define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI
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#else
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#define BTI_FLAG 0
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#endif
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#if __ARM_FEATURE_PAC_DEFAULT & 3
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#define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC
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#else
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#define PAC_FLAG 0
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#endif
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#define GNU_PROPERTY(type, value) \
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.pushsection .note.gnu.property, "a" SEPARATOR \
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.p2align 3 SEPARATOR \
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.word 4 SEPARATOR \
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.word 16 SEPARATOR \
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.word NT_GNU_PROPERTY_TYPE_0 SEPARATOR \
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.asciz "GNU" SEPARATOR \
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.word type SEPARATOR \
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.word 4 SEPARATOR \
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.word value SEPARATOR \
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.word 0 SEPARATOR \
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.popsection
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#if BTI_FLAG != 0
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#define BTI_C hint #34
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#define BTI_J hint #36
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#else
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#define BTI_C
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#define BTI_J
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#endif
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#if (BTI_FLAG | PAC_FLAG) != 0
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#define GNU_PROPERTY_BTI_PAC \
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GNU_PROPERTY(GNU_PROPERTY_AARCH64_FEATURE_1_AND, BTI_FLAG | PAC_FLAG)
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#else
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#define GNU_PROPERTY_BTI_PAC
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#endif
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#if defined(__clang__) || defined(__GCC_HAVE_DWARF2_CFI_ASM)
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#define CFI_START .cfi_startproc
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#define CFI_END .cfi_endproc
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#else
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#define CFI_START
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#define CFI_END
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#endif
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#if defined(__arm__)
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// Determine actual [ARM][THUMB[1][2]] ISA using compiler predefined macros:
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// - for '-mthumb -march=armv6' compiler defines '__thumb__'
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// - for '-mthumb -march=armv7' compiler defines '__thumb__' and '__thumb2__'
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#if defined(__thumb2__) || defined(__thumb__)
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#define DEFINE_CODE_STATE .thumb SEPARATOR
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#define DECLARE_FUNC_ENCODING .thumb_func SEPARATOR
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#if defined(__thumb2__)
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#define USE_THUMB_2
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#define IT(cond) it cond
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#define ITT(cond) itt cond
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#define ITE(cond) ite cond
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#else
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#define USE_THUMB_1
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#define IT(cond)
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#define ITT(cond)
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#define ITE(cond)
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#endif // defined(__thumb__2)
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#else // !defined(__thumb2__) && !defined(__thumb__)
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#define DEFINE_CODE_STATE .arm SEPARATOR
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#define DECLARE_FUNC_ENCODING
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#define IT(cond)
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#define ITT(cond)
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#define ITE(cond)
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#endif
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#if defined(USE_THUMB_1) && defined(USE_THUMB_2)
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#error "USE_THUMB_1 and USE_THUMB_2 can't be defined together."
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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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#if !defined(__ARM_FEATURE_CLZ) && !defined(USE_THUMB_1) && \
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(__ARM_ARCH >= 6 || (__ARM_ARCH == 5 && !defined(__ARM_ARCH_5__)))
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#define __ARM_FEATURE_CLZ
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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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#define JMPc(r, c) bx##c r
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#else
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#define JMP(r) mov pc, r
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#define JMPc(r, c) mov##c pc, r
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#endif
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// pop {pc} can't switch Thumb mode on ARMv4T
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#if __ARM_ARCH >= 5
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#define POP_PC() pop {pc}
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#else
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#define POP_PC() \
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pop {ip}; \
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JMP(ip)
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#endif
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#if defined(USE_THUMB_2)
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#define WIDE(op) op.w
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#else
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#define WIDE(op) op
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#endif
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#else // !defined(__arm)
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#define DECLARE_FUNC_ENCODING
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#define DEFINE_CODE_STATE
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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 GLUE2(a, b) GLUE2_(a, b)
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#define GLUE3_(a, b, c) a##b##c
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#define GLUE3(a, b, c) GLUE3_(a, b, c)
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#define GLUE4_(a, b, c, d) a##b##c##d
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#define GLUE4(a, b, c, d) GLUE4_(a, b, c, d)
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#define SYMBOL_NAME(name) GLUE(__USER_LABEL_PREFIX__, name)
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#ifdef VISIBILITY_HIDDEN
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#define DECLARE_SYMBOL_VISIBILITY(name) \
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HIDDEN(SYMBOL_NAME(name)) SEPARATOR
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#define DECLARE_SYMBOL_VISIBILITY_UNMANGLED(name) \
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HIDDEN(name) SEPARATOR
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#else
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#define DECLARE_SYMBOL_VISIBILITY(name)
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#define DECLARE_SYMBOL_VISIBILITY_UNMANGLED(name)
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#endif
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#define DEFINE_COMPILERRT_FUNCTION(name) \
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DEFINE_CODE_STATE \
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FILE_LEVEL_DIRECTIVE SEPARATOR \
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.globl SYMBOL_NAME(name) SEPARATOR \
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SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
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DECLARE_SYMBOL_VISIBILITY(name) \
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DECLARE_FUNC_ENCODING \
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SYMBOL_NAME(name):
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#define DEFINE_COMPILERRT_THUMB_FUNCTION(name) \
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DEFINE_CODE_STATE \
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FILE_LEVEL_DIRECTIVE SEPARATOR \
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.globl SYMBOL_NAME(name) SEPARATOR \
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SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
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DECLARE_SYMBOL_VISIBILITY(name) SEPARATOR \
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.thumb_func SEPARATOR \
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SYMBOL_NAME(name):
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#define DEFINE_COMPILERRT_PRIVATE_FUNCTION(name) \
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DEFINE_CODE_STATE \
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FILE_LEVEL_DIRECTIVE SEPARATOR \
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.globl SYMBOL_NAME(name) SEPARATOR \
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SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
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HIDDEN(SYMBOL_NAME(name)) SEPARATOR \
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DECLARE_FUNC_ENCODING \
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SYMBOL_NAME(name):
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#define DEFINE_COMPILERRT_PRIVATE_FUNCTION_UNMANGLED(name) \
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DEFINE_CODE_STATE \
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.globl name SEPARATOR \
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SYMBOL_IS_FUNC(name) SEPARATOR \
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HIDDEN(name) SEPARATOR \
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DECLARE_FUNC_ENCODING \
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name:
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#define DEFINE_COMPILERRT_OUTLINE_FUNCTION_UNMANGLED(name) \
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DEFINE_CODE_STATE \
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FUNC_ALIGN \
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.globl name SEPARATOR \
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SYMBOL_IS_FUNC(name) SEPARATOR \
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DECLARE_SYMBOL_VISIBILITY_UNMANGLED(name) SEPARATOR \
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CFI_START SEPARATOR \
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DECLARE_FUNC_ENCODING \
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name: SEPARATOR BTI_C
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#define DEFINE_COMPILERRT_FUNCTION_ALIAS(name, target) \
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.globl SYMBOL_NAME(name) SEPARATOR \
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SYMBOL_IS_FUNC(SYMBOL_NAME(name)) SEPARATOR \
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DECLARE_SYMBOL_VISIBILITY(SYMBOL_NAME(name)) SEPARATOR \
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.set SYMBOL_NAME(name), SYMBOL_NAME(target) SEPARATOR
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#if defined(__ARM_EABI__)
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#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name) \
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DEFINE_COMPILERRT_FUNCTION_ALIAS(aeabi_name, name)
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#else
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#define DEFINE_AEABI_FUNCTION_ALIAS(aeabi_name, name)
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#endif
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#ifdef __ELF__
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#define END_COMPILERRT_FUNCTION(name) \
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.size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
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#define END_COMPILERRT_OUTLINE_FUNCTION(name) \
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CFI_END SEPARATOR \
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.size SYMBOL_NAME(name), . - SYMBOL_NAME(name)
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#else
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#define END_COMPILERRT_FUNCTION(name)
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#define END_COMPILERRT_OUTLINE_FUNCTION(name) \
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CFI_END
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#endif
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#endif // COMPILERRT_ASSEMBLY_H
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