1# Copyright 2024 The Pigweed Authors 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); you may not 4# use this file except in compliance with the License. You may obtain a copy of 5# the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12# License for the specific language governing permissions and limitations under 13# the License. 14 15package(default_visibility = ["//visibility:public"]) 16 17licenses(["notice"]) 18 19# The target Arm processor. 20# 21# The values of this constraint_setting correspond to valid values of the -mcpu 22# compiler flag. See 23# https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html#index-mcpu-2. These 24# values are intended to be used in `target_compatible_with` attributes of 25# toolchains which specify the corresponding value of -mcpu. 26# 27# The constraint_values are not currently exhaustively enumerated (only a few 28# of the legal -mcpu values have corresponding constraint_values). The intent 29# is for additional values to be added when needed. 30# 31# The intent is to support only the base processor type, not -march 32# values (e.g., armv7e-m). This is because it is recommended to use (processor 33# type + optional architectural extensions) when configuring Arm GCC (see 34# https://community.arm.com/arm-community-blogs/b/tools-software-ides-blog/posts/compiler-flags-across-architectures-march-mtune-and-mcpu). 35# In addition, the march values can already be captured using @platforms//cpu. 36# 37# Additionally, extensions should be represented via separate constraints to 38# prevent the explosion of many variants. 39constraint_setting( 40 name = "mcpu", 41 default_constraint_value = "none", 42) 43 44constraint_value( 45 name = "none", 46 constraint_setting = ":mcpu", 47) 48 49constraint_value( 50 name = "cortex-a32", 51 constraint_setting = ":mcpu", 52) 53 54constraint_value( 55 name = "cortex-a35", 56 constraint_setting = ":mcpu", 57) 58 59constraint_value( 60 name = "cortex-m0", 61 constraint_setting = ":mcpu", 62) 63 64constraint_value( 65 name = "cortex-m0plus", 66 constraint_setting = ":mcpu", 67) 68 69constraint_value( 70 name = "cortex-m3", 71 constraint_setting = ":mcpu", 72) 73 74constraint_value( 75 name = "cortex-m4", 76 constraint_setting = ":mcpu", 77) 78 79constraint_value( 80 name = "cortex-m4+nofp", 81 constraint_setting = ":mcpu", 82 deprecation = "FPU properties should be expressed with different constraints", 83) 84 85constraint_value( 86 name = "cortex-m7", 87 constraint_setting = ":mcpu", 88) 89 90constraint_value( 91 name = "cortex-m33", 92 constraint_setting = ":mcpu", 93) 94 95constraint_value( 96 name = "cortex-m33+nofp", 97 constraint_setting = ":mcpu", 98 deprecation = "FPU properties should be expressed with different constraints", 99) 100