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bundle boost.context asm file. drop boost deps
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@microcai
microcai committed Dec 21, 2024
1 parent e2d6da2 commit 3d45739
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13 changes: 5 additions & 8 deletions µasync/CMakeLists.txt
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option(DISABLE_BOOST_CONTEXT "use ucontext even if boost is found" OFF)
option(DISABLE_BOOST_CONTEXT "disable the usa of boost.context asm" OFF)
option(DISABLE_UCONTEXT "disable ucontext and use setjmp/longjmp" OFF)
option(USE_ZCONTEXT "use zcontext api to do context switch" OFF)

cmake_policy(SET CMP0167 NEW)
find_package(Boost 1.86 COMPONENTS context)


add_library(uasync INTERFACE)

target_include_directories(uasync INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)
Expand All @@ -18,9 +14,10 @@ endif()

set_property(TARGET uasync PROPERTY CXX_STANDARD 23)

if (BOOST_FOUND AND NOT DISABLE_BOOST_CONTEXT)
target_compile_definitions(uasync INTERFACE -DUSE_BOOST_CONTEXT=1)
target_link_libraries(uasync INTERFACE Boost::context)
if (NOT DISABLE_BOOST_CONTEXT AND NOT WIN32)
add_subdirectory(asm)
target_compile_definitions(uasync INTERFACE -DUSE_BOOST_CONTEXT=1)
target_link_libraries(uasync INTERFACE fcontext)
endif()

if (DISABLE_UCONTEXT)
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167 changes: 167 additions & 0 deletions µasync/asm/CMakeLists.txt
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## Binary format

if(WIN32)
set(_default_binfmt pe)
elseif(APPLE)
set(_default_binfmt mach-o)
else()
set(_default_binfmt elf)
endif()

set(BOOST_CONTEXT_BINARY_FORMAT "${_default_binfmt}" CACHE STRING "Boost.Context binary format (elf, mach-o, pe, xcoff)")
set_property(CACHE BOOST_CONTEXT_BINARY_FORMAT PROPERTY STRINGS elf mach-o pe xcoff)

unset(_default_binfmt)

## ABI

math(EXPR _bits "${CMAKE_SIZEOF_VOID_P}*8")

if(CMAKE_SYSTEM_PROCESSOR MATCHES "^[Aa][Rr][Mm]" OR CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
set(_default_abi aapcs)
elseif(WIN32)
set(_default_abi ms)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
if(_bits EQUAL 32)
set(_default_abi o32)
else()
set(_default_abi n64)
endif()
else()
set(_default_abi sysv)
endif()

set(BOOST_CONTEXT_ABI "${_default_abi}" CACHE STRING "Boost.Context ABI (aapcs, eabi, ms, n32, n64, o32, o64, sysv, x32)")
set_property(CACHE BOOST_CONTEXT_ABI PROPERTY STRINGS aapcs eabi ms n32 n64 o32 o64 sysv x32)

unset(_default_abi)

## Arch-and-model

set(_all_archs arm arm64 loongarch64 mips32 mips64 power riscv64 s390x i386 x86_64 combined)

# Try at start to auto determine arch from CMake.
if(CMAKE_SYSTEM_PROCESSOR IN_LIST _all_archs)
set(_default_arch ${CMAKE_SYSTEM_PROCESSOR})
elseif(_bits EQUAL 32)
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^[Aa][Rr][Mm]")
set(_default_arch arm)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
set(_default_arch mips32)
else()
set(_default_arch i386)
endif()
else()
if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64" OR
CMAKE_SYSTEM_PROCESSOR MATCHES "^[Aa][Rr][Mm]") # armv8
set(_default_arch arm64)
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
set(_default_arch mips64)
else()
set(_default_arch x86_64)
endif()
endif()

set(BOOST_CONTEXT_ARCHITECTURE "${_default_arch}" CACHE STRING "Boost.Context architecture (arm, arm64, loongarch64, mips32, mips64, power, riscv64, s390x, i386, x86_64, combined)")
set_property(CACHE BOOST_CONTEXT_ARCHITECTURE PROPERTY STRINGS ${_all_archs})

unset(_all_archs)
unset(_bits)
unset(_default_arch)

## Assembler type

if(MSVC)
if(BOOST_CONTEXT_ARCHITECTURE STREQUAL arm64 OR BOOST_CONTEXT_ARCHITECTURE STREQUAL arm)
set(_default_asm armasm)
else()
set(_default_asm masm)
endif()
else()
set(_default_asm gas)
endif()

set(BOOST_CONTEXT_ASSEMBLER "${_default_asm}" CACHE STRING "Boost.Context assembler (masm, gas, armasm)")
set_property(CACHE BOOST_CONTEXT_ASSEMBLER PROPERTY STRINGS masm gas armasm)

unset(_default_asm)

## Assembler source suffix

if(BOOST_CONTEXT_BINARY_FORMAT STREQUAL pe)
set(_default_ext .asm)
elseif(BOOST_CONTEXT_ASSEMBLER STREQUAL gas)
set(_default_ext .S)
else()
set(_default_ext .asm)
endif()

set(BOOST_CONTEXT_ASM_SUFFIX "${_default_ext}" CACHE STRING "Boost.Context assembler source suffix (.asm, .S)")
set_property(CACHE BOOST_CONTEXT_ASM_SUFFIX PROPERTY STRINGS .asm .S)

unset(_default_ext)

## Implementation

set(_default_impl fcontext)

set(BOOST_CONTEXT_IMPLEMENTATION "${_default_impl}" CACHE STRING "Boost.Context implementation (fcontext, ucontext, winfib)")
set_property(CACHE BOOST_CONTEXT_IMPLEMENTATION PROPERTY STRINGS fcontext ucontext winfib)

unset(_default_impl)

#

message(STATUS "Boost.Context: "
"architecture ${BOOST_CONTEXT_ARCHITECTURE}, "
"binary format ${BOOST_CONTEXT_BINARY_FORMAT}, "
"ABI ${BOOST_CONTEXT_ABI}, "
"assembler ${BOOST_CONTEXT_ASSEMBLER}, "
"suffix ${BOOST_CONTEXT_ASM_SUFFIX}, "
"implementation ${BOOST_CONTEXT_IMPLEMENTATION}")

# Enable the right assembler

if(BOOST_CONTEXT_ASSEMBLER STREQUAL gas)
if(CMAKE_CXX_PLATFORM_ID MATCHES "Cygwin")
enable_language(ASM-ATT)
else()
enable_language(ASM)
endif()
elseif(BOOST_CONTEXT_ASSEMBLER STREQUAL armasm)
enable_language(ASM_ARMASM)
else()
enable_language(ASM_MASM)
endif()

# Choose .asm sources

if(BOOST_CONTEXT_BINARY_FORMAT STREQUAL mach-o)
set(BOOST_CONTEXT_BINARY_FORMAT macho)
endif()

set(_asm_suffix ${BOOST_CONTEXT_ARCHITECTURE}_${BOOST_CONTEXT_ABI}_${BOOST_CONTEXT_BINARY_FORMAT}_${BOOST_CONTEXT_ASSEMBLER}${BOOST_CONTEXT_ASM_SUFFIX})

set(ASM_SOURCES
make_${_asm_suffix}
jump_${_asm_suffix}
)

unset(_asm_suffix)

#
if(BOOST_CONTEXT_ASSEMBLER STREQUAL masm)
set(CMAKE_ASM_MASM_CREATE_STATIC_LIBRARY "<CMAKE_AR> /OUT:<TARGET> <LINK_FLAGS> <OBJECTS>")
endif()

if(BOOST_CONTEXT_ASSEMBLER STREQUAL masm AND BOOST_CONTEXT_ARCHITECTURE STREQUAL i386)
set_source_files_properties(${ASM_SOURCES} PROPERTIES COMPILE_FLAGS "/safeseh")
endif()

if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
set_property(SOURCE ${ASM_SOURCES} APPEND PROPERTY COMPILE_OPTIONS "-x" "assembler-with-cpp")
endif()


add_library(fcontext ${ASM_SOURCES})
115 changes: 115 additions & 0 deletions µasync/asm/jump_arm64_aapcs_elf_gas.S
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/*
Copyright Edward Nevill + Oliver Kowalke 2015
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
*/
/*******************************************************
* *
* ------------------------------------------------- *
* | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | *
* ------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c| *
* ------------------------------------------------- *
* | d8 | d9 | d10 | d11 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ------------------------------------------------- *
* | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c| *
* ------------------------------------------------- *
* | d12 | d13 | d14 | d15 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
* ------------------------------------------------- *
* | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c| *
* ------------------------------------------------- *
* | x19 | x20 | x21 | x22 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | *
* ------------------------------------------------- *
* | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c| *
* ------------------------------------------------- *
* | x23 | x24 | x25 | x26 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | *
* ------------------------------------------------- *
* | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c| *
* ------------------------------------------------- *
* | x27 | x28 | FP | LR | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 40 | 41 | 42 | 43 | | | *
* ------------------------------------------------- *
* | 0xa0| 0xa4| 0xa8| 0xac| | | *
* ------------------------------------------------- *
* | PC | align | | | *
* ------------------------------------------------- *
* *
*******************************************************/

.file "jump_arm64_aapcs_elf_gas.S"
.text
.align 2
.global jump_fcontext
.hidden jump_fcontext
.type jump_fcontext, %function
jump_fcontext:
# prepare stack for GP + FPU
sub sp, sp, #0xb0

# save d8 - d15
stp d8, d9, [sp, #0x00]
stp d10, d11, [sp, #0x10]
stp d12, d13, [sp, #0x20]
stp d14, d15, [sp, #0x30]

# save x19-x30
stp x19, x20, [sp, #0x40]
stp x21, x22, [sp, #0x50]
stp x23, x24, [sp, #0x60]
stp x25, x26, [sp, #0x70]
stp x27, x28, [sp, #0x80]
stp x29, x30, [sp, #0x90]

# save LR as PC
str x30, [sp, #0xa0]

# store RSP (pointing to context-data) in X0
mov x4, sp

# restore RSP (pointing to context-data) from X1
mov sp, x0

# load d8 - d15
ldp d8, d9, [sp, #0x00]
ldp d10, d11, [sp, #0x10]
ldp d12, d13, [sp, #0x20]
ldp d14, d15, [sp, #0x30]

# load x19-x30
ldp x19, x20, [sp, #0x40]
ldp x21, x22, [sp, #0x50]
ldp x23, x24, [sp, #0x60]
ldp x25, x26, [sp, #0x70]
ldp x27, x28, [sp, #0x80]
ldp x29, x30, [sp, #0x90]

# return transfer_t from jump
# pass transfer_t as first arg in context function
# X0 == FCTX, X1 == DATA
mov x0, x4

# load pc
ldr x4, [sp, #0xa0]

# restore stack from GP + FPU
add sp, sp, #0xb0

ret x4
.size jump_fcontext,.-jump_fcontext
# Mark that we don't need executable stack.
.section .note.GNU-stack,"",%progbits
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