2 # Copyright (c) 2005 Martin Decky
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
9 # - Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
11 # - Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in the
13 # documentation and/or other materials provided with the distribution.
14 # - The name of the author may not be used to endorse or promote products
15 # derived from this software without specific prior written permission.
17 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 subdir('arch' / KARCH)
35 # Defines genarch_src.
38 # Defines generic_src, instrumentable_src.
44 ## Cross-platform assembly to start a symtab.data section
46 symtab_section = '.section symtab.data, "a", ' + atsign + 'progbits;'
48 kernel_include_dirs = include_directories(
51 'arch' / KARCH / 'include',
52 '..' / 'abi' / 'arch' / KARCH / 'include',
53 '..' / 'abi' / 'include',
58 '-imacros', meson.build_root() / 'config.h',
61 '-DHELENOS_RELEASE=' + HELENOS_RELEASE,
62 '-DHELENOS_COPYRIGHT=' + HELENOS_COPYRIGHT,
63 '-DHELENOS_CODENAME=' + HELENOS_CODENAME,
64 '-D__@0@_BITS__'.format(meson.get_cross_property('bits')),
67 # Preprocess linker script using C preprocessor.
68 kernel_ldscript = custom_target('_link.ld',
69 input: 'arch' / KARCH / '_link.ld.in',
75 '-I' + meson.current_source_dir() / 'arch' / KARCH / 'include',
84 build_by_default: true,
87 kernel_link_args = arch_kernel_link_args + [
89 '-T', meson.current_build_dir() / '_link.ld',
93 kernel_link_args += [ '-flto' ]
96 if CONFIG_STRIP_BINARIES
97 # TODO: do this after disassembling
98 kernel_link_args += [ '-s' ]
101 kernel_c_args = arch_kernel_c_args + kernel_defs + [
104 cc.get_supported_arguments([
105 # TODO: remove this flag
106 '-Wno-cast-function-type',
108 # When accessing specific memory addresses that are below
109 # normal page size, the compiler may assume that we actually
110 # dereferenced NULL pointer and warns us about that.
111 # But in kernel we often need to access these addresses
112 # directly hence we need to ignore these warnings.
114 # TODO: might make more sense to disable this selectively
115 # in specific files (or better yet, for specific lines).
116 '--param=min-pagesize=0',
121 kernel_c_args += [ '-flto' ]
124 if cc.get_id() == 'clang'
126 '-fno-stack-protector',
128 '-mllvm', '-asm-macro-max-nesting-depth=1000',
132 instrumentables = static_library('instrumentables', instrumentable_src,
133 include_directories: kernel_include_dirs,
134 implicit_include_directories: false,
135 c_args: kernel_c_args + (CONFIG_TRACE ? [ '-finstrument-functions' ] : []),
139 noninstrumentables = static_library('noninstrumentables', arch_src, genarch_src, generic_src, test_src,
140 include_directories: kernel_include_dirs,
141 implicit_include_directories: false,
142 c_args: kernel_c_args,
146 all_kernel_objects = [ instrumentables, noninstrumentables ]
148 # We iterate the build several times to get symbol table right.
149 # Three times is sufficient to get correct even symbols after symtab.
152 # Iterate build three times.
153 iterations = [ 1, 2, 3 ]
155 # Generates symbol table information as an object file.
156 genmap = find_program('tools/genmap.py')
158 # Symbol table dump needed for genmap.
159 kernel_syms = custom_target('kernel_syms.txt',
160 input: all_kernel_objects,
161 output: 'kernel_syms.txt',
162 command: [ objdump, '-t', '@INPUT@' ],
170 # Empty symbol map for first iteration.
171 kernel_map_S = custom_target('empty_map.S',
172 output: 'empty_map.S',
174 command: [ 'echo', kernel_as_prolog + symtab_section ],
177 foreach iter : iterations
178 is_last = (iter == iterations.length())
179 kernel_name = 'kernel.@0@.elf'.format(iter)
180 kernel_map_name = kernel_name + '.map'
181 kernel_map_path = meson.current_build_dir() / kernel_map_name
183 kernel_elf = executable(kernel_name, kernel_map_S,
184 include_directories: kernel_include_dirs,
185 implicit_include_directories: false,
186 c_args: kernel_c_args,
187 link_args: kernel_c_args + kernel_link_args + [
188 '-Wl,-Map,' + kernel_map_path,
190 link_depends: kernel_ldscript,
191 link_whole: all_kernel_objects,
195 # Generate symbol table if this is not the final iteration.
198 # TODO: Teach kernel to read its own ELF symbol table and get rid of this nonsense.
199 # Need to first make sure all architectures (even future ones with dumb bootloaders) can use ELF formatted kernel.
201 kernel_map_bin = custom_target(kernel_map_name + '.bin',
202 output: kernel_map_name + '.bin',
203 input: [ kernel_elf, kernel_syms ],
204 command: [ genmap, kernel_map_path, '@INPUT1@', '@OUTPUT@' ],
207 kernel_map_S_name = kernel_name + '.map.S'
209 kernel_map_S = custom_target(kernel_map_S_name,
210 input: kernel_map_bin,
211 output: kernel_map_S_name,
213 command: [ 'echo', kernel_as_prolog + symtab_section + ' .incbin "@INPUT@"' ],
218 rd_init_binaries += [[ kernel_elf, 'boot/kernel.elf' ]]
220 install_files += [[ 'boot', kernel_elf.full_path(), 'kernel.elf' ]]
221 install_deps += [ kernel_elf ]
223 kernel_disasm = custom_target('kernel.elf.disasm',
224 command: [ objdump, '-S', '@INPUT@' ],
226 output: 'kernel.elf.disasm',
228 build_by_default: true,
231 # TODO: Add configuration option for installing debug files
233 install_files += [[ 'boot', kernel_disasm.full_path(), 'kernel.elf.disasm' ]]
234 install_deps += [ kernel_disasm ]