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arch/risc-v: add missing CMake support for standalone ELF applications

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The CMake build had no STARTUP_OBJS (crt0) target and no elf.cmake, so
applications were linked without crt0 and without '-e _start': the ELF
entry defaulted to main and applications crashed on exit returning to
a NULL address.

Add STARTUP_OBJS and elf.cmake with the LDELFFLAGS equivalents from
Toolchain.defs, following the other architectures.

Signed-off-by: raiden00pl <raiden00@railab.me>
Assisted-by: Claude Code
This commit is contained in:
raiden00pl 2026-08-04 21:45:54 +02:00 • committed by Xiang Xiao
parent bfad05b9fa
commit a3e7e995e5
2 changed files with 47 additions and 0 deletions
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40
arch/risc-v/src/cmake/elf.cmake Normal file
View file

@ -0,0 +1,40 @@
# ##############################################################################
# arch/risc-v/src/cmake/elf.cmake
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more contributor
# license agreements. See the NOTICE file distributed with this work for
# additional information regarding copyright ownership. The ASF licenses this
# file to you under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
#
# ##############################################################################
# Link options for standalone ELF applications, matching the Make flow
# LDELFFLAGS from arch/risc-v/src/common/Toolchain.defs
nuttx_elf_compile_options(-fvisibility=hidden)
nuttx_mod_compile_options(-fvisibility=hidden)
nuttx_mod_link_options(-r)
nuttx_elf_link_options_ifdef(CONFIG_BINFMT_ELF_RELOCATABLE -r)
if(CONFIG_ARCH_RV32)
nuttx_elf_link_options(--oformat elf32-littleriscv)
else()
nuttx_elf_link_options(--oformat elf64-littleriscv)
endif()
nuttx_elf_link_options(-e _start)

7
arch/risc-v/src/common/CMakeLists.txt
View file

@ -140,3 +140,10 @@ if(CONFIG_ARCH_USE_S_MODE)
endif()
target_sources(arch PRIVATE ${SRCS})
nuttx_add_aux_library(STARTUP_OBJS crt0.c)
target_compile_options(
STARTUP_OBJS
PRIVATE
$<GENEX_EVAL:$<TARGET_PROPERTY:nuttx_global,NUTTX_ELF_APP_COMPILE_OPTIONS>>)