1# 2# SPDX-License-Identifier: BSD-3-Clause 3# 4# Copyright © 2019 Keith Packard 5# 6# Redistribution and use in source and binary forms, with or without 7# modification, are permitted provided that the following conditions 8# are met: 9# 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 13# 2. Redistributions in binary form must reproduce the above 14# copyright notice, this list of conditions and the following 15# disclaimer in the documentation and/or other materials provided 16# with the distribution. 17# 18# 3. Neither the name of the copyright holder nor the names of its 19# contributors may be used to endorse or promote products derived 20# from this software without specific prior written permission. 21# 22# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 31# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 33# OF THE POSSIBILITY OF SUCH DAMAGE. 34# 35 36src_picocrt = [] 37 38machine_dir = 'machine' / host_cpu_family 39picocrt_march_add='' 40if fs.is_dir(machine_dir) 41 subdir(machine_dir) 42else 43 src_picocrt = files('shared/crt0.c') 44endif 45 46foreach target : targets 47 value = get_variable('target_' + target) 48 49 instdir = join_paths(lib_dir, value[0]) 50 51 if picocrt_march_add != '' 52 new_cflags = [] 53 foreach cflag : value[1] 54 if cflag.startswith('-march') and not cflag.contains(picocrt_march_add) 55 cflag = cflag + picocrt_march_add 56 endif 57 new_cflags += cflag 58 endforeach 59 value = [value[0], new_cflags] 60 endif 61 62 if target == '' 63 crt_name = 'crt0.o' 64 crt_hosted_name = 'crt0-hosted.o' 65 crt_minimal_name = 'crt0-minimal.o' 66 crt_semihost_name = 'crt0-semihost.o' 67 libcrt_name = 'crt0' 68 libcrt_hosted_name = 'crt0-hosted' 69 libcrt_minimal_name = 'crt0-minimal' 70 libcrt_semihost_name = 'crt0-semihost' 71 else 72 crt_name = join_paths(target, 'crt0.o') 73 crt_hosted_name = join_paths(target, 'crt0-hosted.o') 74 crt_minimal_name = join_paths(target, 'crt0-minimal.o') 75 crt_semihost_name = join_paths(target, 'crt0-semihost.o') 76 libcrt_name = join_paths(target, 'libcrt0') 77 libcrt_hosted_name = join_paths(target, 'libcrt0-hosted') 78 libcrt_minimal_name = join_paths(target, 'libcrt0-minimal') 79 libcrt_semihost_name = join_paths(target, 'libcrt0-semihost') 80 endif 81 82 crt0_name = 'crt0' + target 83 crt0_hosted_name = 'crt0_hosted' + target 84 crt0_minimal_name = 'crt0_minimal' + target 85 crt0_semihost_name = 'crt0_semihost' + target 86 87 # The normal variant does not call 'exit' after return from main (c lingo: freestanding execution environment) 88 _crt = executable(crt_name, 89 src_picocrt, 90 include_directories : inc, 91 install : true, 92 install_dir : instdir, 93 c_args : value[1] + arg_fnobuiltin + ['-ffreestanding'], 94 link_args : value[1] + ['-r', '-ffreestanding']) 95 96 set_variable(crt0_name, 97 _crt.extract_objects(src_picocrt) 98 ) 99 100 if enable_picocrt_lib 101 static_library(libcrt_name, 102 [], 103 install : true, 104 install_dir : instdir, 105 pic: false, 106 objects : [_crt.extract_objects(src_picocrt)]) 107 endif 108 109 # The 'hosted' variant calls 'exit' after return from main (c lingo: hosted execution environment) 110 _crt = executable(crt_hosted_name, 111 src_picocrt, 112 include_directories : inc, 113 install : true, 114 install_dir : instdir, 115 c_args : value[1] + arg_fnobuiltin + ['-ffreestanding', '-DCRT0_EXIT'], 116 link_args : value[1] + ['-r', '-ffreestanding']) 117 118 set_variable(crt0_hosted_name, 119 _crt.extract_objects(src_picocrt) 120 ) 121 122 if enable_picocrt_lib 123 static_library(libcrt_hosted_name, 124 [], 125 install : true, 126 install_dir : instdir, 127 pic: false, 128 objects : [_crt.extract_objects(src_picocrt)]) 129 endif 130 131 # The 'minimal' variant doesn't call exit, nor does it invoke any constructors 132 _crt = executable(crt_minimal_name, 133 src_picocrt, 134 include_directories : inc, 135 install : true, 136 install_dir : instdir, 137 c_args : value[1] + arg_fnobuiltin + ['-ffreestanding', '-DCONSTRUCTORS=0'], 138 link_args : value[1] + ['-r', '-ffreestanding']) 139 140 set_variable(crt0_minimal_name, 141 _crt.extract_objects(src_picocrt) 142 ) 143 144 if enable_picocrt_lib 145 static_library(libcrt_minimal_name, 146 [], 147 install : true, 148 install_dir : instdir, 149 pic: false, 150 objects : [_crt.extract_objects(src_picocrt)]) 151 endif 152 153 if has_arm_semihost 154 # The 'semihost' variant calls sys_semihost_get_cmdline to build argv 155 # and calls exit when main returns 156 _crt = executable(crt_semihost_name, 157 src_picocrt, 158 include_directories : inc, 159 install : true, 160 install_dir : instdir, 161 c_args : value[1] + arg_fnobuiltin + ['-ffreestanding', '-DCRT0_EXIT', '-DCRT0_SEMIHOST'], 162 link_args : value[1] + ['-r', '-ffreestanding']) 163 164 set_variable(crt0_semihost_name, 165 _crt.extract_objects(src_picocrt) 166 ) 167 168 if enable_picocrt_lib 169 static_library(libcrt_semihost_name, 170 [], 171 install : true, 172 install_dir : instdir, 173 pic: false, 174 objects : [_crt.extract_objects(src_picocrt)]) 175 endif 176 endif 177endforeach 178
