82 lines
2.6 KiB
CMake
82 lines
2.6 KiB
CMake
#
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# Convert a file (text or binary) into an assembler source file suitable
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# for gcc. Designed to replicate 'objcopy' with more predictable
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# naming, and supports appending a null byte for embedding text as
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# a string.
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#
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# Designed to be run as a script with "cmake -P"
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#
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# Set variables DATA_FILE, SOURCE_FILE, FILE_TYPE when running this.
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#
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# If FILE_TYPE is set to TEXT, a null byte is appended to DATA_FILE's contents
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# before SOURCE_FILE is created.
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#
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# If FILE_TYPE is unset (or any other value), DATA_FILE is copied
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# verbatim into SOURCE_FILE.
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#
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#
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if(NOT DATA_FILE)
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message(FATAL_ERROR "DATA_FILE for converting must be specified")
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endif()
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if(NOT SOURCE_FILE)
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message(FATAL_ERROR "SOURCE_FILE destination must be specified")
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endif()
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file(READ "${DATA_FILE}" data HEX)
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string(LENGTH "${data}" data_len)
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math(EXPR data_len "${data_len} / 2") # 2 hex bytes per byte
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if(FILE_TYPE STREQUAL "TEXT")
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set(data "${data}00") # null-byte termination
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endif()
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## Convert string of raw hex bytes to lines of hex bytes as gcc .byte expressions
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string(REGEX REPLACE "................................" ".byte \\0\n" data "${data}") # 16 bytes per line
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string(REGEX REPLACE "[^\n]+$" ".byte \\0\n" data "${data}") # last line
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string(REGEX REPLACE "[0-9a-f][0-9a-f]" "0x\\0, " data "${data}") # hex formatted C bytes
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string(REGEX REPLACE ", \n" "\n" data "${data}") # trim the last comma
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get_filename_component(varname "${DATA_FILE}" NAME)
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function(append str)
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file(APPEND "${SOURCE_FILE}" "${str}")
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endfunction()
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function(append_line str)
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append("${str}\n")
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endfunction()
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function(make_and_append_identifier str)
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string(MAKE_C_IDENTIFIER "${str}" symbol)
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append_line("\n.global ${symbol}")
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append("${symbol}:")
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if(${ARGC} GREATER 1) # optional comment
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append(" /* ${ARGV1} */")
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endif()
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append("\n")
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endfunction()
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file(WRITE "${SOURCE_FILE}" "/*")
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append_line(" * Data converted from ${DATA_FILE}")
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if(FILE_TYPE STREQUAL "TEXT")
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append_line(" * (null byte appended)")
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endif()
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append_line(" */")
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append_line(".data")
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append_line(".section .rodata.embedded")
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make_and_append_identifier("${varname}")
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make_and_append_identifier("_binary_${varname}_start" "for objcopy compatibility")
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append("${data}")
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make_and_append_identifier("_binary_${varname}_end" "for objcopy compatibility")
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append_line("")
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if(FILE_TYPE STREQUAL "TEXT")
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make_and_append_identifier("${varname}_length" "not including null byte")
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else()
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make_and_append_identifier("${varname}_length")
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endif()
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append_line(".word ${data_len}")
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