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',
91 # The kernel is built as ELF but then copied as a blob of bytes and
92 # the permissions are not relevant anyway (needed for binutils 2.39+).
93 kernel_link_args += ldflags_ignore_rwx_segments
96 kernel_link_args += [ '-flto' ]
99 if CONFIG_STRIP_BINARIES
100 # TODO: do this after disassembling
101 kernel_link_args += [ '-s' ]
104 kernel_c_args = arch_kernel_c_args + kernel_defs + [
107 cc.get_supported_arguments([
108 # TODO: remove this flag
109 '-Wno-cast-function-type',
111 # When accessing specific memory addresses that are below
112 # normal page size, the compiler may assume that we actually
113 # dereferenced NULL pointer and warns us about that.
114 # But in kernel we often need to access these addresses
115 # directly hence we need to ignore these warnings.
117 # TODO: might make more sense to disable this selectively
118 # in specific files (or better yet, for specific lines).
119 '--param=min-pagesize=0',
124 kernel_c_args += [ '-flto' ]
127 if cc.get_id() == 'clang'
129 '-fno-stack-protector',
131 '-mllvm', '-asm-macro-max-nesting-depth=1000',
135 instrumentables = static_library('instrumentables', instrumentable_src,
136 include_directories: kernel_include_dirs,
137 implicit_include_directories: false,
138 c_args: kernel_c_args + (CONFIG_TRACE ? [ '-finstrument-functions' ] : []),
142 noninstrumentables = static_library('noninstrumentables', arch_src, genarch_src, generic_src, test_src,
143 include_directories: kernel_include_dirs,
144 implicit_include_directories: false,
145 c_args: kernel_c_args,
149 all_kernel_objects = [ instrumentables, noninstrumentables ]
151 # We iterate the build several times to get symbol table right.
152 # Three times is sufficient to get correct even symbols after symtab.
155 # Iterate build three times.
156 iterations = [ 1, 2, 3 ]
158 # Generates symbol table information as an object file.
159 genmap = find_program('tools/genmap.py')
161 # Symbol table dump needed for genmap.
162 kernel_syms = custom_target('kernel_syms.txt',
163 input: all_kernel_objects,
164 output: 'kernel_syms.txt',
165 command: [ objdump, '-t', '@INPUT@' ],
173 # Empty symbol map for first iteration.
174 kernel_map_S = custom_target('empty_map.S',
175 output: 'empty_map.S',
177 command: [ 'echo', kernel_as_prolog + symtab_section ],
180 foreach iter : iterations
181 is_last = (iter == iterations.length())
182 kernel_name = 'kernel.@0@.elf'.format(iter)
183 kernel_map_name = kernel_name + '.map'
184 kernel_map_path = meson.current_build_dir() / kernel_map_name
186 kernel_elf = executable(kernel_name, kernel_map_S,
187 include_directories: kernel_include_dirs,
188 implicit_include_directories: false,
189 c_args: kernel_c_args,
190 link_args: kernel_c_args + kernel_link_args + [
191 '-Wl,-Map,' + kernel_map_path,
193 link_depends: kernel_ldscript,
194 link_whole: all_kernel_objects,
198 # Generate symbol table if this is not the final iteration.
201 # TODO: Teach kernel to read its own ELF symbol table and get rid of this nonsense.
202 # Need to first make sure all architectures (even future ones with dumb bootloaders) can use ELF formatted kernel.
204 kernel_map_bin = custom_target(kernel_map_name + '.bin',
205 output: kernel_map_name + '.bin',
206 input: [ kernel_elf, kernel_syms ],
207 command: [ genmap, kernel_map_path, '@INPUT1@', '@OUTPUT@' ],
210 kernel_map_S_name = kernel_name + '.map.S'
212 kernel_map_S = custom_target(kernel_map_S_name,
213 input: kernel_map_bin,
214 output: kernel_map_S_name,
216 command: [ 'echo', kernel_as_prolog + symtab_section + ' .incbin "@INPUT@"' ],
221 rd_init_binaries += [[ kernel_elf, 'boot/kernel.elf' ]]
223 install_files += [[ 'boot', kernel_elf.full_path(), 'kernel.elf' ]]
224 install_deps += [ kernel_elf ]
226 kernel_disasm = custom_target('kernel.elf.disasm',
227 command: [ objdump, '-S', '@INPUT@' ],
229 output: 'kernel.elf.disasm',
231 build_by_default: true,
234 # TODO: Add configuration option for installing debug files
236 install_files += [[ 'boot', kernel_disasm.full_path(), 'kernel.elf.disasm' ]]
237 install_deps += [ kernel_disasm ]