1#-------------------------------------------------------------------------------
2# Copyright (c) 2020-2022, Arm Limited and Contributors. All rights reserved.
3#
4# SPDX-License-Identifier: BSD-3-Clause
5#
6#-------------------------------------------------------------------------------
7
8# Since we append to default compilation flags stop multiple inclusion to avoid
9# flags being added multiple times.
10include_guard(GLOBAL)
11
12if(NOT CROSS_COMPILE AND NOT DEFINED ENV{CROSS_COMPILE})
13	set(CROSS_COMPILE "aarch64-linux-gnu-;aarch64-none-linux-gnu-" CACHE STRING "List of GCC prefix triplets to use.")
14endif()
15
16set(CMAKE_CROSSCOMPILING True)
17set(CMAKE_SYSTEM_NAME Linux)
18set(CMAKE_SYSTEM_PROCESSOR arm)
19
20set(TS_DEBUG_INFO_FLAGS "-fdiagnostics-show-option -gdwarf-2" CACHE STRING "Compiler flags to add debug information.")
21set(TS_MANDATORY_AARCH_FLAGS "-mstrict-align -march=armv8-a+crc -DARM64=1" CACHE STRING "Compiler flags configuring architecture specific ")
22set(TS_WARNING_FLAGS "-Wall -Werror" CACHE STRING "Compiler flags affecting generating warning messages.")
23set(TS_MANDATORY_LINKER_FLAGS "" CACHE STRING "Linker flags needed for correct builds.")
24
25# branch-protection enables bti/pac while compile force-bti tells the linker to
26# warn if some object files lack the .note.gnu.property section with the BTI
27# flag, and to turn on the BTI flag in the output anyway.
28set(BRANCH_PROTECTION unset CACHE STRING "Enable branch protection")
29set_property(CACHE BRANCH_PROTECTION PROPERTY STRINGS unset 0 1 2 3 4)
30
31if(BRANCH_PROTECTION STREQUAL "0")
32	set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=none")
33elseif(BRANCH_PROTECTION STREQUAL "1")
34	set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=standard")
35	set(TS_MANDATORY_LINKER_FLAGS "${TS_MANDATORY_LINKER_FLAGS} -zforce-bti")
36	add_compile_definitions("BTI_ENABLED")
37elseif(BRANCH_PROTECTION STREQUAL "2")
38	set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=pac-ret")
39elseif(BRANCH_PROTECTION STREQUAL "3")
40	set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=pac-ret+leaf")
41elseif(BRANCH_PROTECTION STREQUAL "4")
42	set(TS_MANDATORY_AARCH_FLAGS "${TS_MANDATORY_AARCH_FLAGS} -mbranch-protection=bti")
43	set(TS_MANDATORY_LINKER_FLAGS "${TS_MANDATORY_LINKER_FLAGS} -zforce-bti")
44	add_compile_definitions("BTI_ENABLED")
45endif()
46
47# Set flags affecting all build types
48string(APPEND CMAKE_C_FLAGS_INIT " ${TS_MANDATORY_AARCH_FLAGS}")
49string(APPEND CMAKE_CXX_FLAGS_INIT " ${TS_MANDATORY_AARCH_FLAGS}")
50string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " ${TS_MANDATORY_LINKER_FLAGS}")
51if(DEFINED TS_ROOT)
52	# Flags not to be used with external components.
53	string(APPEND CMAKE_C_FLAGS_INIT " ${TS_WARNING_FLAGS}")
54	string(APPEND CMAKE_CXX_FLAGS_INIT " ${TS_WARNING_FLAGS}")
55endif()
56
57# Set flags affecting all build types supporting debugging.
58foreach(_b_type IN ITEMS DEBUG RELWITHDEBINFO MINSIZWITHDEBINFO DEBUGCOVERAGE)
59	string(APPEND CMAKE_C_FLAGS_${_b_type}_INIT " ${TS_DEBUG_INFO_FLAGS}")
60	string(APPEND CMAKE_CXX_FLAGS_${_b_type}_INIT " ${TS_DEBUG_INFO_FLAGS}")
61endforeach()
62
63# Build type specific flags
64string(APPEND CMAKE_C_FLAGS_DEBUG_INIT " -O0")
65string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT  " -Os")
66string(APPEND CMAKE_C_FLAGS_MINSIZWITHDEBINFO_INIT " -Os")
67string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " -O2")
68string(APPEND CMAKE_C_FLAGS_RELWITHDEBINFO_INIT " -O2")
69string(APPEND CMAKE_C_FLAGS_DEBUGCOVERAGE_INIT " -O0 -coverage")
70string(APPEND CMAKE_CXX_FLAGS_DEBUG_INIT " -O0")
71string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT  " -Os")
72string(APPEND CMAKE_CXX_FLAGS_MINSIZWITHDEBINFO_INIT " -Os")
73string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -O2")
74string(APPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT " -O2")
75string(APPEND CMAKE_CXX_FLAGS_DEBUGCOVERAGE_INIT " -O0 -coverage")
76
77include($ENV{TS_ROOT}/tools/cmake/compiler/GCC.cmake REQUIRED)
78include($ENV{TS_ROOT}/tools/cmake/compiler/config_iface.cmake REQUIRED)
79