66 lines
2.9 KiB
CMake
66 lines
2.9 KiB
CMake
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# ##############################################################################
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# cmake/nuttx_generate_sim_ld.cmake
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more contributor
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# license agreements. See the NOTICE file distributed with this work for
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# additional information regarding copyright ownership. The ASF licenses this
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# file to you under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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#
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# ##############################################################################
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# cmake-format: off
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# C++ global objects are constructed before main get executed, but it isn't a
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# good point for simulator because NuttX doesn't finish the kernel
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# initialization yet.
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# So we have to skip the standard facilities and do the construction by ourself.
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# But how to achieve the goal?
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# 1.Command linker generate the default script(-verbose)
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# 2.Replace __init_array_start/__init_array_end with _sinit/_einit
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# 3.Append __init_array_start = .; __init_array_end = .;
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# Step 2 let nxtask_startup find objects need to construct
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# Step 3 cheat the host there is no object to construct
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# Note: the destructor can be fixed in the same way.
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set(PROCESS_SIM_LD_SCRIPT
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[[
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#!/bin/sh
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original_ld="$1"
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target_ld="$2"
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cat $original_ld | \
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sed -e '/====/,/====/!d;//d' \
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-e '/__executable_start/s/$/PROVIDE(_stext = .);/' \
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-e 's/^\(\s\+\)\(\.init_array\)/\1\2 : { }\n\1.sinit/g' \
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-e 's/^\(\s\+\)\(\.fini_array\)/\1\2 : { }\n\1.einit/g' \
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-e 's/__init_array_start/_sinit/g' -e 's/__init_array_end/_einit/g' \
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-e 's/__fini_array_start/_sfini/g' -e 's/__fini_array_end/_efini/g' > "$target_ld"
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echo "__init_array_start = .; __init_array_end = .; __fini_array_start = .; __fini_array_end = .;" >> "$target_ld"
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]])
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# cmake-format: on
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file(WRITE ${CMAKE_BINARY_DIR}/process_sim_ld_script.sh
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"${PROCESS_SIM_LD_SCRIPT}")
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file(
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COPY ${CMAKE_BINARY_DIR}/process_sim_ld_script.sh
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DESTINATION ${CMAKE_BINARY_DIR}
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FILE_PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ)
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add_custom_command(
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OUTPUT nuttx.ld
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COMMAND
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${CMAKE_C_COMPILER} ${CMAKE_EXE_LINKER_FLAGS}
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$<$<BOOL:${CONFIG_SIM_M32}>:-m32> -Wl,-verbose 2> /dev/null > nuttx-orig.ld
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|| true
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COMMAND sh process_sim_ld_script.sh nuttx-orig.ld nuttx.ld
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COMMAND sed -i '/\\.data *:/i " ${CONFIG_SIM_CUSTOM_DATA_SECTION} " ' nuttx.ld
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COMMENT "Generating sim linker script nuttx.ld"
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
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