编译riscv gcc
下载完毕后，就要开始编译。首先在riscv-gnu-toolchain根目录下，创建build目录。用于编译riscv gcc。
riscv gcc可以编译成以下几个版本
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riscv32-unknown-elf-gcc
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riscv64-unknown-elf-gcc
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riscv32-unknown-linux-gnu-gcc
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riscv64-unknown-linux-gnu-gcc
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riscv64-multilib-elf-gcc
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riscv64-liunx-multilib-gcc
以下编译，是基于 riscv架构支持 imc三种指令集，来进行编译的。如果想要支持其他的指令集，只需要修改--with-arch选项。
使用以下这个命令，将所有仓库，都clone下来。 git clone --recursive https://github.com/riscv/riscv-gnu-toolchain 以下是各个仓库的github地址： riscv-gcc https://github.com/riscv/riscv-gcc riscv-glibc https://github.com/riscv/riscv-glibc riscv-newlib https://github.com/riscv/riscv-newlib riscv-dejagnu https://github.com/riscv/riscv-dejagnu riscv-gdb https://github.com/riscv/riscv-binutils-gdb.git riscv-binutils https://github.com/riscv/riscv-binutils-gdb.git riscv-qemu https://github.com/riscv/riscv-qemu.git
ABI
Supported ABIs are ilp32 (32-bit soft-float), ilp32d (32-bit hard-float), ilp32f (32-bit with single-precision in registers and double in memory, niche use only), lp64 lp64f lp64d (same but with 64-bit long and pointers).编译注意：
1、glibc 和 gcc 不要去单独编译
2、ABI
码云
mkdir /opt/riscv
export RISCV=/opt/riscv
[root@centos7 ~]# git clone --recursive https://gitee.com/mirrors/riscv-gnu-toolchain.git Cloning into 'riscv-gnu-toolchain'... remote: Enumerating objects: 51, done. remote: Counting objects: 100% (51/51), done. remote: Compressing objects: 100% (51/51), done. remote: Total 8695 (delta 15), reused 0 (delta 0), pack-reused 8644 Receiving objects: 100% (8695/8695), 5.03 MiB | 0 bytes/s, done. Resolving deltas: 100% (4719/4719), done. Submodule 'qemu' (https://git.qemu.org/git/qemu.git) registered for path 'qemu' Submodule 'riscv-binutils' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-binutils' Submodule 'riscv-dejagnu' (https://github.com/riscv-collab/riscv-dejagnu.git) registered for path 'riscv-dejagnu' Submodule 'riscv-gcc' (https://github.com/riscv-collab/riscv-gcc.git) registered for path 'riscv-gcc' Submodule 'riscv-gdb' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-gdb' Submodule 'riscv-glibc' (git://sourceware.org/git/glibc.git) registered for path 'riscv-glibc' Submodule 'riscv-newlib' (git://sourceware.org/git/newlib-cygwin.git) registered for path 'riscv-newlib' Cloning into 'qemu'...
设置代理
git config --global url."https://github.com.cnpmjs.org/".insteadOf "https://github.com/"
[root@centos7 ~]# cd riscv-gnu-toolchain/ [root@centos7 riscv-gnu-toolchain]# mkdir build; cd build [root@centos7 build]# ../configure --prefix=/opt/riscv --enable-multilib checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for grep that handles long lines and -e... /usr/bin/grep checking for fgrep... /usr/bin/grep -F checking for grep that handles long lines and -e... (cached) /usr/bin/grep checking for bash... /bin/sh checking for __gmpz_init in -lgmp... yes checking for mpfr_init in -lmpfr... yes checking for mpc_init2 in -lmpc... yes checking for curl... /usr/bin/curl checking for wget... /usr/bin/wget checking for ftp... no configure: creating ./config.status config.status: creating Makefile config.status: creating scripts/wrapper/awk/awk config.status: creating scripts/wrapper/sed/sed [root@centos7 build]# make -j128
[root@centos7 build]# ls build-binutils-linux build-gdb-linux config.log config.status Makefile scripts stamps [root@centos7 build]# ls ../src ls: cannot access ../src: No such file or directory [root@centos7 build]#
[root@centos7 build]# ls /opt/riscv/ bin include lib libexec riscv64-unknown-elf share You have new mail in /var/spool/mail/root [root@centos7 build]# ls /opt/riscv/bin/ riscv64-unknown-elf-addr2line riscv64-unknown-elf-c++filt riscv64-unknown-elf-gcc riscv64-unknown-elf-gcc-ranlib riscv64-unknown-elf-gprof riscv64-unknown-elf-nm riscv64-unknown-elf-readelf riscv64-unknown-elf-ar riscv64-unknown-elf-cpp riscv64-unknown-elf-gcc-11.1.0 riscv64-unknown-elf-gcov riscv64-unknown-elf-ld riscv64-unknown-elf-objcopy riscv64-unknown-elf-size riscv64-unknown-elf-as riscv64-unknown-elf-elfedit riscv64-unknown-elf-gcc-ar riscv64-unknown-elf-gcov-dump riscv64-unknown-elf-ld.bfd riscv64-unknown-elf-objdump riscv64-unknown-elf-strings riscv64-unknown-elf-c++ riscv64-unknown-elf-g++ riscv64-unknown-elf-gcc-nm riscv64-unknown-elf-gcov-tool riscv64-unknown-elf-lto-dump riscv64-unknown-elf-ranlib riscv64-unknown-elf-strip [root@centos7 build]#
在build目录下，有如下的文件夹和文件生成。
其中有newlib和newlib-nano，就表示c运行库，就是用的newlib以及newlib-nano
unknown-linux-gnu-gcc
make clean
[root@centos7 build]# make clean rm -rf build-* stamps install-newlib-nano [root@centos7 build]#
[root@centos7 build]# mkdir /opt/riscv-gnu You have new mail in /var/spool/mail/root [root@centos7 build]# ../configure --prefix=/opt/riscv-gnu checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for grep that handles long lines and -e... /usr/bin/grep checking for fgrep... /usr/bin/grep -F checking for grep that handles long lines and -e... (cached) /usr/bin/grep checking for bash... /bin/sh checking for __gmpz_init in -lgmp... yes checking for mpfr_init in -lmpfr... yes checking for mpc_init2 in -lmpc... yes checking for curl... /usr/bin/curl checking for wget... /usr/bin/wget checking for ftp... no configure: creating ./config.status config.status: creating Makefile config.status: creating scripts/wrapper/awk/awk config.status: creating scripts/wrapper/sed/sed [root@centos7 build]# make linux -j128
make编译得到是我们最常用的unknown-elf-gcc等工具链，而make linux则是unknown-linux-gnu-gcc
[root@centos7 build]# ls /opt/riscv-gnu/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-ld.bfd riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-ranlib
gcc生成失败
Resolving deltas: 100% (550451/550451), done. Submodule path 'riscv-glibc': checked out '9826b03b747b841f5fc6de2054bf1ef3f5c4bdf3'
[root@centos7 build]# make clean
rm -rf build-* stamps install-newlib-nano
[root@centos7 build]# ls
config.log config.status Makefile scripts
[root@centos7 build]#
删除build
[root@centos7 build]# make distclean rm -rf build-* stamps install-newlib-nano rm -rf src
[root@centos7 build]# make clean rm -rf build-* stamps install-newlib-nano [root@centos7 build]# ls config.log config.status Makefile scripts [root@centos7 build]# cd .. [root@centos7 riscv-gnu-toolchain-gnu]# rm build/ -rf [root@centos7 riscv-gnu-toolchain-gnu]# mkdir build; cd build [root@centos7 build]# ../configure --prefix=/opt/riscv64-linux --with-arch=rv64imafdc --enable-linux checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for grep that handles long lines and -e... /usr/bin/grep checking for fgrep... /usr/bin/grep -F checking for grep that handles long lines and -e... (cached) /usr/bin/grep checking for bash... /bin/sh checking for __gmpz_init in -lgmp... yes checking for mpfr_init in -lmpfr... yes checking for mpc_init2 in -lmpc... yes checking for curl... /usr/bin/curl checking for wget... /usr/bin/wget checking for ftp... no configure: creating ./config.status config.status: creating Makefile config.status: creating scripts/wrapper/awk/awk config.status: creating scripts/wrapper/sed/sed
riscv-gcc
[root@centos7 riscv-gcc]# ../configure --prefix=/opt/riscv64-linux checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for grep that handles long lines and -e... /usr/bin/grep checking for fgrep... /usr/bin/grep -F checking for grep that handles long lines and -e... (cached) /usr/bin/grep checking for bash... /bin/sh checking for __gmpz_init in -lgmp... yes checking for mpfr_init in -lmpfr... yes checking for mpc_init2 in -lmpc... yes checking for curl... /usr/bin/curl checking for wget... /usr/bin/wget checking for ftp... no configure: creating ./config.status config.status: creating Makefile config.status: creating scripts/wrapper/awk/awk config.status: creating scripts/wrapper/sed/sed [root@centos7 riscv-gcc]# make linux -j128 Makefile:26: *** missing separator. Stop. [root@centos7 riscv-gcc]# vi Makefile +26
单独编译gcc
删除riscv-gcc
重新拉取下
$ git clone https://gitee.com/mirrors/riscv-gnu-toolchain
进入源码目录：
$ cd riscv-gnu-toolchain
注意上面 clone 的主仓库并不包含子仓库的内容，所以需要继续更新子仓库。注意这里首先排除了 qemu 这个子仓库，一来因为 qemu 完整下载太大；二来 qemu 对 toolchain 的编译本身来说其实并不需要。
$ git rm qemu
$ git submodule update --init --recursive
耐心等待子仓库下载完成。
[root@centos7 riscv_build]# git clone https://gitee.com/mirrors/riscv-gnu-toolchain Cloning into 'riscv-gnu-toolchain'... remote: Enumerating objects: 51, done. remote: Counting objects: 100% (51/51), done. remote: Compressing objects: 100% (51/51), done. remote: Total 8695 (delta 15), reused 0 (delta 0), pack-reused 8644 Receiving objects: 100% (8695/8695), 5.03 MiB | 8.94 MiB/s, done. Resolving deltas: 100% (4719/4719), done. [root@centos7 riscv_build]# cd riscv-gnu-toolchain [root@centos7 riscv-gnu-toolchain]# git rm qemu rm 'qemu' [root@centos7 riscv-gnu-toolchain]# git submodule update --init --recursive Submodule 'riscv-binutils' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-binutils' Submodule 'riscv-dejagnu' (https://github.com/riscv-collab/riscv-dejagnu.git) registered for path 'riscv-dejagnu' Submodule 'riscv-gcc' (https://github.com/riscv-collab/riscv-gcc.git) registered for path 'riscv-gcc' Submodule 'riscv-gdb' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-gdb' Submodule 'riscv-glibc' (git://sourceware.org/git/glibc.git) registered for path 'riscv-glibc' Submodule 'riscv-newlib' (git://sourceware.org/git/newlib-cygwin.git) registered for path 'riscv-newlib' Cloning into 'riscv-binutils'...
/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build
1090 mkdir build 1091 cd build/ 1092 ../configure --prefix=/opt/riscv64-linux 1093 make -j128
[root@centos7 build]# ls aarch64-unknown-linux-gnu lto-plugin stage1-fixincludes build-aarch64-unknown-linux-gnu Makefile stage1-gcc compare prev-aarch64-unknown-linux-gnu stage1-intl config.log prev-fixincludes stage1-libbacktrace config.status prev-gcc stage1-libcody c++tools prev-intl stage1-libcpp fixincludes prev-libbacktrace stage1-libdecnumber gcc prev-libcody stage1-libiberty intl prev-libcpp stage1-lto-plugin libbacktrace prev-libdecnumber stage1-zlib libcc1 prev-libiberty stage_current libcody prev-lto-plugin stage_final libcpp prev-zlib stage_last libdecnumber serdep.tmp zlib libiberty stage1-aarch64-unknown-linux-gnu [root@centos7 build]# pwd /root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build [root@centos7 build]# ls /opt/riscv64-linux/bin/ aarch64-unknown-linux-gnu-c++ gcc-ar riscv64-unknown-linux-gnu-elfedit aarch64-unknown-linux-gnu-g++ gcc-nm riscv64-unknown-linux-gnu-gprof aarch64-unknown-linux-gnu-gcc gcc-ranlib riscv64-unknown-linux-gnu-ld aarch64-unknown-linux-gnu-gcc-11.1.0 gcov riscv64-unknown-linux-gnu-ld.bfd aarch64-unknown-linux-gnu-gcc-ar gcov-dump riscv64-unknown-linux-gnu-nm aarch64-unknown-linux-gnu-gcc-nm gcov-tool riscv64-unknown-linux-gnu-objcopy aarch64-unknown-linux-gnu-gcc-ranlib gfortran riscv64-unknown-linux-gnu-objdump aarch64-unknown-linux-gnu-gfortran lto-dump riscv64-unknown-linux-gnu-ranlib c++ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-readelf cpp riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-size g++ riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-strings gcc riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-strip
是aarch64
[root@centos7 build]# make distclean make[1]: Entering directory `/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build' rm -f stage_current make[1]: Leaving directory `/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build' rm -rf stage1-* rm -rf stage2-*
gcc --target=riscv64-unknown --with-arch
[root@centos7 build]# ../configure --prefix=/opt/riscv64-linux --target=riscv64-unknown-linux-gnu checking build system type... aarch64-unknown-linux-gnu checking host system type... aarch64-unknown-linux-gnu checking target system type... riscv64-unknown-linux-gnu checking for a BSD-compatible install... /usr/bin/install -c checking whether ln works... yes checking whether ln -s works... yes checking for a sed that does not truncate output... /usr/bin/sed checking for gawk... gawk checking for libatomic support... yes checking for libitm support... no checking for libsanitizer support... yes checking for libvtv support... no checking for libhsail-rt support... no checking for libphobos support... yes checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for g++... g++ checking whether we are using the GNU C++ compiler... yes checking whether g++ accepts -g... yes checking whether g++ accepts -static-libstdc++ -static-libgcc... yes checking for gnatbind... gnatbind checking for gnatmake... gnatmake checking whether compiler driver understands Ada... yes checking how to compare bootstrapped objects... cmp --ignore-initial=16 $$f1 $$f2 checking whether g++ supports C++11 features by default... no checking whether g++ supports C++11 features with -std=gnu++11... yes checking for objdir... .libs checking for the correct version of gmp.h... yes checking for the correct version of mpfr.h... buggy but acceptable checking for the correct version of mpc.h... yes checking for the correct version of the gmp/mpfr/mpc libraries... yes checking for isl 0.15 or later... no required isl version is 0.15 or later The following languages will be built: c,c++,fortran,lto,objc *** This configuration is not supported in the following subdirectories: target-libitm target-libvtv gnattools gotools target-libada target-libhsail-rt target-libphobos target-zlib target-libgo target-libffi target-liboffloadmic (Any other directories should still work fine.) checking for default BUILD_CONFIG... checking for --enable-vtable-verify... no *** removing c++tools/Makefile to force reconfigure checking for bison... bison -y checking for bison... bison checking for gm4... no checking for gnum4... no checking for m4... m4 checking for flex... flex checking for flex... flex checking for makeinfo... makeinfo checking for expect... no checking for runtest... no checking for ar... ar checking for as... as checking for dlltool... no checking for ld... ld checking for lipo... no checking for nm... nm checking for ranlib... ranlib checking for strip... strip checking for windres... no checking for windmc... no checking for objcopy... objcopy checking for objdump... objdump checking for otool... no checking for readelf... readelf checking for riscv64-unknown-linux-gnu-cc... no checking for riscv64-unknown-linux-gnu-gcc... no checking for riscv64-unknown-linux-gnu-c++... no checking for riscv64-unknown-linux-gnu-g++... no checking for riscv64-unknown-linux-gnu-cxx... no checking for riscv64-unknown-linux-gnu-gxx... no checking for riscv64-unknown-linux-gnu-gcc... no checking for riscv64-unknown-linux-gnu-gfortran... no checking for riscv64-unknown-linux-gnu-gccgo... no checking for riscv64-unknown-linux-gnu-gdc... no checking for ar... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/ar checking for as... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/as checking for dlltool... no checking for riscv64-unknown-linux-gnu-dlltool... no checking for ld... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/ld checking for lipo... no checking for riscv64-unknown-linux-gnu-lipo... no checking for nm... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/nm checking for objcopy... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/objcopy checking for objdump... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/objdump checking for otool... no checking for riscv64-unknown-linux-gnu-otool... no checking for ranlib... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/ranlib checking for readelf... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/readelf checking for strip... /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin/strip checking for windres... no checking for riscv64-unknown-linux-gnu-windres... no checking for windmc... no checking for riscv64-unknown-linux-gnu-windmc... no checking where to find the target ar... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target as... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target cc... just compiled checking where to find the target c++... just compiled checking where to find the target c++ for libstdc++... just compiled checking where to find the target dlltool... pre-installed checking where to find the target gcc... just compiled checking where to find the target gfortran... just compiled checking where to find the target gccgo... pre-installed checking where to find the target gdc... pre-installed checking where to find the target ld... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target lipo... pre-installed checking where to find the target nm... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target objcopy... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target objdump... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target otool... pre-installed checking where to find the target ranlib... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target readelf... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target strip... pre-installed in /opt/riscv64-linux/riscv64-unknown-linux-gnu/bin checking where to find the target windres... pre-installed checking where to find the target windmc... pre-installed checking whether to enable maintainer-specific portions of Makefiles... no configure: creating ./config.status config.status: creating Makefile
compilation terminated. compilation terminated. make[4]: *** [Makefile:925: _gcov_execv.o] Error 1 In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/libgcov-interface.c:27: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ compilation terminated. In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/libgcov-interface.c:27: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ make[4]: *** [Makefile:925: _gcov_execvp.o] Error 1 compilation terminated. make[4]: *** [Makefile:925: _gcov_execve.o] Error 1 make[4]: *** [Makefile:925: _gcov_reset.o] Error 1 make[4]: *** [Makefile:925: _gcov_lock_unlock.o] Error 1 In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/unwind-sjlj.c:31: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ compilation terminated. In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/emutls.c:31: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ compilation terminated. make[4]: *** [../../../../../libgcc/shared-object.mk:14: unwind-sjlj.o] Error 1 make[4]: *** [../../../../../libgcc/shared-object.mk:14: emutls.o] Error 1 In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/unwind-dw2.c:37: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ compilation terminated. In file included from ../../../../../libgcc/gthr.h:148, from ../../../../../libgcc/unwind-dw2-fde-dip.c:47: ./gthr-default.h:35:10: fatal error: pthread.h: No such file or directory 35 | #include <pthread.h> | ^~~~~~~~~~~ compilation terminated. make[4]: *** [../../../../../libgcc/shared-object.mk:14: unwind-dw2.o] Error 1 make[4]: *** [../../../../../libgcc/shared-object.mk:14: unwind-dw2-fde-dip.o] Error 1 make[4]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build/riscv64-unknown-linux-gnu/lib32/ilp32/libgcc' make[3]: *** [Makefile:1211: multi-do] Error 1 make[3]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build/riscv64-unknown-linux-gnu/libgcc' make[2]: *** [Makefile:127: all-multi] Error 2 make[2]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build/riscv64-unknown-linux-gnu/libgcc' make[1]: *** [Makefile:13854: all-target-libgcc] Error 2 make[1]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/riscv-gcc/build' make: *** [Makefile:961: all] Error 2 [root@centos7 build]# find ./ -name pthread.h [root@centos7 build]# cd ..
参考How to Build a GCC Cross-Compiler
不能单独编译gcc
../configure --prefix=/opt/riscv64-linux --with-arch=rv64imafdc --with-abi=lp64 --enable-linux
make linux $(nproc)
最终编译glibc还是报错,gcc编译成功
checking for library containing waddstr... -lncursesw
checking for library containing tgetent... none required checking size of unsigned long long... 8 checking size of unsigned long... 8 checking size of unsigned __int128... 16 checking for library containing dlopen... none required checking whether to use expat... yes checking for libexpat... no configure: error: expat is missing or unusable make[2]: *** [Makefile:10036: configure-gdb] Error 1 make[2]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make[1]: *** [Makefile:854: all] Error 2 make[1]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make: *** [Makefile:281: stamps/build-gdb-linux] Error 2 You have new mail in /var/spool/mail/root [root@centos7 build]# ls /opt/riscv64/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-ld.bfd riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-ranlib [root@centos7 build]# ls /opt/riscv64-linux/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-gcc-ar riscv64-unknown-linux-gnu-lto-dump riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-gcc-nm riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-gcc-ranlib riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-c++ riscv64-unknown-linux-gnu-gcov riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-gcov-dump riscv64-unknown-linux-gnu-ranlib riscv64-unknown-linux-gnu-cpp riscv64-unknown-linux-gnu-gcov-tool riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-gfortran riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-g++ riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-gcc riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-gcc-11.1.0 riscv64-unknown-linux-gnu-ld.bfd [root@centos7 build]# ls /opt/riscv64-linux/ bin include lib lib64 libexec riscv64-unknown-linux-gnu share sysroot [root@centos7 build]# ls /opt/riscv64-linux/sysroot/ etc lib sbin usr var [root@centos7 build]#
[root@centos7 build]# /opt/riscv64-linux/bin/riscv64-unknown-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/opt/riscv64-linux/bin/riscv64-unknown-linux-gnu-gcc COLLECT_LTO_WRAPPER=/opt/riscv64-linux/libexec/gcc/riscv64-unknown-linux-gnu/11.1.0/lto-wrapper Target: riscv64-unknown-linux-gnu Configured with: /root/riscv_build/riscv-gnu-toolchain/build/../riscv-gcc/configure --target=riscv64-unknown-linux-gnu --prefix=/opt/riscv64-linux --with-sysroot=/opt/riscv64-linux/sysroot --with-system-zlib --enable-shared --enable-tls --enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp --disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap --src=../../riscv-gcc --disable-multilib --with-abi=lp64 --with-arch=rv64imafdc --with-tune=rocket 'CFLAGS_FOR_TARGET=-O2 -mcmodel=medlow' 'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medlow' Thread model: posix Supported LTO compression algorithms: zlib gcc version 11.1.0 (GCC) [root@centos7 build]#
[root@centos7 build]# pwd /root/riscv_build/riscv-gnu-toolchain/build [root@centos7 build]#
[root@centos7 build]# ls build-binutils-linux build-gdb-linux config.log scripts build-gcc-linux-stage1 build-glibc-linux-headers config.status stamps build-gcc-linux-stage2 build-glibc-linux-rv64imafdc-lp64 Makefile [root@centos7 build]# vi Makefile
[root@centos7 riscv_debug]# riscv64-unknown-linux-gnu-gcc -print-sysroot /opt/riscv64-linux/sysroot [root@centos7 riscv_debug]# riscv64-unknown-linux-gnu-gcc -dumpmachine riscv64-unknown-linux-gnu [root@centos7 riscv_debug]#
[root@centos7 build]# file /opt/riscv64-linux/bin/riscv64-unknown-linux-gnu-gcc /opt/riscv64-linux/bin/riscv64-unknown-linux-gnu-gcc: ELF 64-bit LSB executable, ARM aarch64, version 1 (GNU/Linux), dynamically linked (uses shared libs), for GNU/Linux 3.7.0, BuildID[sha1]=d92cee985ed96437624011d203e5f3db8a70e9fd, not stripped [root@centos7 build]#
riscv-glibc（可以不编译，直接git rm）
[root@centos7 riscv-gnu-toolchain]# cd riscv-glibc/ [root@centos7 riscv-glibc]# mkdir build; cd build [root@centos7 build]# ../configure --prefix=/opt/riscv64-linux checking build system type... aarch64-unknown-linux-gnu checking host system type... aarch64-unknown-linux-gnu checking for gcc... gcc
checking for python3... python3 checking version of python3... 3.6.8, ok configure: error: *** These critical programs are missing or too old: make compiler *** Check the INSTALL file for required versions. [root@centos7 build]# make -j128 make: *** No targets specified and no makefile found. Stop. [root@centos7 build]# ls config.log
[root@centos7 build]# make --version GNU Make 3.82 Built for aarch64-redhat-linux-gnu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
下载make http://ftp.gnu.org/gnu/make/
tar -zxvf make-4.3.tar.gz #解压
cd make-4.3 #进入目录
./configure #
make && make install #编译#安装
ln -s -f /usr/local/bin/make /usr/bin/make #必须运行该语句否则还是旧版本
make -version
[root@centos7 make-4.3]# ls /usr/local/bin/make /usr/local/bin/make [root@centos7 make-4.3]# /usr/local/bin/make --version GNU Make 4.3 Built for aarch64-unknown-linux-gnu Copyright (C) 1988-2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. [root@centos7 make-4.3]#
[root@centos7 make-4.3]# ls /usr/bin/make /usr/bin/make [root@centos7 make-4.3]# mv /usr/bin/make /usr/bin/make.bak [root@centos7 make-4.3]# ln -s -f /usr/local/bin/make /usr/bin/make [root@centos7 make-4.3]# make --version GNU Make 4.3 Built for aarch64-unknown-linux-gnu Copyright (C) 1988-2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. [root@centos7 make-4.3]#
升级make后还报这个错误，可以忽略
checking for python3... python3 checking version of python3... 3.6.8, ok configure: error: *** These critical programs are missing or too old: compiler *** Check the INSTALL file for required versions.
../configure --prefix=/opt/riscv64-linux --with-arch=rv64imafdc --with-abi=lp64 --enable-linux
make linux $(nproc)
最终编译glibc还是报错
checking for library containing waddstr... -lncursesw checking for library containing tgetent... none required checking size of unsigned long long... 8 checking size of unsigned long... 8 checking size of unsigned __int128... 16 checking for library containing dlopen... none required checking whether to use expat... yes checking for libexpat... no configure: error: expat is missing or unusable make[2]: *** [Makefile:10036: configure-gdb] Error 1 make[2]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make[1]: *** [Makefile:854: all] Error 2 make[1]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make: *** [Makefile:281: stamps/build-gdb-linux] Error 2 You have new mail in /var/spool/mail/root [root@centos7 build]# ls /opt/riscv64/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-ld.bfd riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-ranlib [root@centos7 build]# ls /opt/riscv64-linux/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-gcc-ar riscv64-unknown-linux-gnu-lto-dump riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-gcc-nm riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-gcc-ranlib riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-c++ riscv64-unknown-linux-gnu-gcov riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-gcov-dump riscv64-unknown-linux-gnu-ranlib riscv64-unknown-linux-gnu-cpp riscv64-unknown-linux-gnu-gcov-tool riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-gfortran riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-g++ riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-gcc riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-gcc-11.1.0 riscv64-unknown-linux-gnu-ld.bfd [root@centos7 build]# ls /opt/riscv64-linux/ bin include lib lib64 libexec riscv64-unknown-linux-gnu share sysroot [root@centos7 build]# ls /opt/riscv64-linux/sysroot/ etc lib sbin usr var [root@centos7 build]#
sysroot
sysroot/usr/lib
checking for library containing waddstr... -lncursesw checking for library containing tgetent... none required checking size of unsigned long long... 8 checking size of unsigned long... 8 checking size of unsigned __int128... 16 checking for library containing dlopen... none required checking whether to use expat... yes checking for libexpat... no configure: error: expat is missing or unusable make[2]: *** [Makefile:10036: configure-gdb] Error 1 make[2]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make[1]: *** [Makefile:854: all] Error 2 make[1]: Leaving directory '/root/riscv_build/riscv-gnu-toolchain/build/build-gdb-linux' make: *** [Makefile:281: stamps/build-gdb-linux] Error 2 You have new mail in /var/spool/mail/root [root@centos7 build]# ls /opt/riscv64/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-ld.bfd riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-ranlib [root@centos7 build]# ls /opt/riscv64-linux/bin/ riscv64-unknown-linux-gnu-addr2line riscv64-unknown-linux-gnu-gcc-ar riscv64-unknown-linux-gnu-lto-dump riscv64-unknown-linux-gnu-ar riscv64-unknown-linux-gnu-gcc-nm riscv64-unknown-linux-gnu-nm riscv64-unknown-linux-gnu-as riscv64-unknown-linux-gnu-gcc-ranlib riscv64-unknown-linux-gnu-objcopy riscv64-unknown-linux-gnu-c++ riscv64-unknown-linux-gnu-gcov riscv64-unknown-linux-gnu-objdump riscv64-unknown-linux-gnu-c++filt riscv64-unknown-linux-gnu-gcov-dump riscv64-unknown-linux-gnu-ranlib riscv64-unknown-linux-gnu-cpp riscv64-unknown-linux-gnu-gcov-tool riscv64-unknown-linux-gnu-readelf riscv64-unknown-linux-gnu-elfedit riscv64-unknown-linux-gnu-gfortran riscv64-unknown-linux-gnu-size riscv64-unknown-linux-gnu-g++ riscv64-unknown-linux-gnu-gprof riscv64-unknown-linux-gnu-strings riscv64-unknown-linux-gnu-gcc riscv64-unknown-linux-gnu-ld riscv64-unknown-linux-gnu-strip riscv64-unknown-linux-gnu-gcc-11.1.0 riscv64-unknown-linux-gnu-ld.bfd [root@centos7 build]# ls /opt/riscv64-linux/ bin include lib lib64 libexec riscv64-unknown-linux-gnu share sysroot [root@centos7 build]# ls /opt/riscv64-linux/sysroot/ etc lib sbin usr var [root@centos7 build]#
Makefile
Makefile
riscv64-linux-gnu-
Ubuntu (tested on 19.04):
$ apt-get install git build-essential gdb-multiarch $ apt-get install qemu-system-misc gcc-riscv64-linux-gnu binutils-riscv64-linux-gnu
交叉编译
[root@centos7 linux-5.14]# make ARCH=riscv CROSS_COMPILE=riscv64-unknown-elf-gcc menuconfig UPD scripts/kconfig/mconf-cfg HOSTCC scripts/kconfig/mconf.o HOSTCC scripts/kconfig/lxdialog/checklist.o HOSTCC scripts/kconfig/lxdialog/inputbox.o HOSTCC scripts/kconfig/lxdialog/menubox.o HOSTCC scripts/kconfig/lxdialog/textbox.o HOSTCC scripts/kconfig/lxdialog/util.o HOSTCC scripts/kconfig/lxdialog/yesno.o HOSTLD scripts/kconfig/mconf scripts/Kconfig.include:39: compiler 'riscv64-unknown-elf-gccgcc' not found make[2]: *** [menuconfig] Error 1 make[1]: *** [menuconfig] Error 2 make: *** [__sub-make] Error 2 [root@centos7 linux-5.14]# make ARCH=riscv CROSS_COMPILE=riscv64-unknown-elf- menuconfig .config - Linux/riscv 5.14.0 Kernel Configuration
[root@centos7 linux-5.14]# grep "GCC_PLUGIN" .config CONFIG_HAVE_GCC_PLUGINS=y CONFIG_GCC_PLUGINS=y # CONFIG_GCC_PLUGIN_CYC_COMPLEXITY is not set # CONFIG_GCC_PLUGIN_LATENT_ENTROPY is not set # CONFIG_GCC_PLUGIN_RANDSTRUCT is not set # CONFIG_GCC_PLUGIN_STRUCTLEAK_USER is not set # CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF is not set # CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL is not set [root@centos7 linux-5.14]# grep "GCC_PLUGIN" .config.bak CONFIG_HAVE_GCC_PLUGINS=y [root@centos7 linux-5.14]# rm .config rm: remove regular file ‘.config’? u [root@centos7 linux-5.14]# cp .config.bak .config cp: overwrite ‘.config’? y [root@centos7 linux-5.14]#
安装 riscv64-unknown-elf-gdb
-
安装依赖（针对 Linux，macOS 可以遇到错误再去搜索）
- python 并非必须
- 在
Ubuntu 20.04等系统中，python和python-dev需要替换成python2和python2-devsudo apt-get install libncurses5-dev python python-dev texinfo libreadline-dev
-
前往清华镜像下载最新的 GDB 源代码
-
解压源代码，并定位到目录
-
执行以下命令
--prefix是安装的路径，按照以上指令会安装到/usr/local/bin/下--with-python是python2的地址，它和--enable-tui都是为了支持后续安装一个可视化插件，并非必须
../configure --prefix=/opt/riscv/ --with-python=/usr/bin/python --target=riscv64-unknown-elf --enable-tui=yes
[root@centos7 gdb-11.1]# mkdir build [root@centos7 gdb-11.1]# cd build/ [root@centos7 build]# ../configure --prefix=/opt/riscv/ --with-python=/usr/bin/python --target=riscv64-unknown-elf --enable-tui=yes
# Linux
make -j$(nproc)
files='./gdb.go gdb/experimental.go gdb/iterator.go gdb/printing.go gdb/support.go gdb/types.go' ; \ cd ./guile ; \ for go in $files ; do \ source="`echo $go | sed 's/\.go$/.scm/'`" ; \ echo compile -Warity-mismatch -Wformat -Wunused-toplevel -L . -o "$go" "$source" ; \ compile -Warity-mismatch -Wformat -Wunused-toplevel -L . -o "$go" "$source" || exit 1 ; \ done ; \ fi mkdir ./system-gdbinit touch stamp-guile files='elinos.py wrs-linux.py' ; \ for file in $files ; do \ f=../../../gdb/data-directory/../system-gdbinit/$file ; \ if test -f $f ; then \ /usr/bin/install -c -m 644 $f ./system-gdbinit ; \ fi ; \ done touch stamp-system-gdbinit mkdir -p -- ./python/gdb touch stamp-syscalls mkdir -p -- ./python/gdb/command mkdir -p -- ./python/gdb/function mkdir -p -- ./python/gdb/printer touch stamp-python make[4]: Leaving directory `/root/riscv_debug/gdb-11.1/build/gdb/data-directory' make[3]: Leaving directory `/root/riscv_debug/gdb-11.1/build/gdb' make[2]: Leaving directory `/root/riscv_debug/gdb-11.1/build/gdb' make[1]: Leaving directory `/root/riscv_debug/gdb-11.1/build'
[root@centos7 build]# make install
[root@centos7 riscv]# find ./ -name riscv64-unknown-elf-gdb ./bin/riscv64-unknown-elf-gdb [root@centos7 riscv]#
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux.o GNU gdb (GDB) 11.1 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux.o... (gdb) b rand_initialize Breakpoint 1 at 0x20dac8: file drivers/char/random.c, line 1779. (gdb) r Don't know how to run. Try "help target". (gdb)
qemu
[root@centos7 qemu-4.2.0]# ./configure --target-list=riscv64-softmmu --prefix=/opt/riscv/
make -j $(nproc)
sudo make install
[root@centos7 linux-5.14]# qemu-system-riscv64 -version QEMU emulator version 4.2.0 Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers [root@centos7 linux-5.14]#
[root@centos7 buildroot]# ls output/images/ fw_dynamic.bin fw_dynamic.elf fw_jump.bin fw_jump.elf rootfs.bak rootfs.ext2 rootfs.tar start-qemu.sh [root@centos7 buildroot]#
[root@centos7 buildroot]# cat output/images/start-qemu.sh #!/bin/sh ( BINARIES_DIR="${0%/*}/" cd ${BINARIES_DIR} if [ "${1}" = "serial-only" ]; then EXTRA_ARGS='-nographic' else EXTRA_ARGS='' fi export PATH="/root/buildroot-2021.08.1/output/host/bin:${PATH}" exec qemu-system-riscv64 -M virt -bios fw_jump.elf -kernel Image -append "rootwait root=/dev/vda ro" -drive file=rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -netdev user,id=net0 -device virtio-net-device,netdev=net0 -nographic ${EXTRA_ARGS} )
[root@centos7 ~]# ls ~/riscv_debug/linux-5.14/arch/riscv/boot/Image /root/riscv_debug/linux-5.14/arch/riscv/boot/Image [root@centos7 ~]# ls ~/riscv_debug/linux-5.14/arch/riscv/boot/ dts Image Image.gz install.sh loader.lds.S loader.S Makefile [root@centos7 ~]#
"start-qemu.sh" 6L, 291C written [root@centos7 images]# bash start-qemu.sh OpenSBI v0.9 ____ _____ ____ _____ / __ \ / ____| _ \_ _| | | | |_ __ ___ _ __ | (___ | |_) || | | | | | '_ \ / _ \ '_ \ \___ \| _ < | | | |__| | |_) | __/ | | |____) | |_) || |_ \____/| .__/ \___|_| |_|_____/|____/_____| | | |_| Platform Name : riscv-virtio,qemu Platform Features : timer,mfdeleg Platform HART Count : 1 Firmware Base : 0x80000000 Firmware Size : 124 KB Runtime SBI Version : 0.2 Domain0 Name : root Domain0 Boot HART : 0 Domain0 HARTs : 0* Domain0 Region00 : 0x0000000080000000-0x000000008001ffff () Domain0 Region01 : 0x0000000000000000-0xffffffffffffffff (R,W,X) Domain0 Next Address : 0x0000000080200000 Domain0 Next Arg1 : 0x0000000082200000 Domain0 Next Mode : S-mode Domain0 SysReset : yes Boot HART ID : 0 Boot HART Domain : root Boot HART ISA : rv64imafdcsu Boot HART Features : scounteren,mcounteren Boot HART PMP Count : 16 Boot HART PMP Granularity : 4 Boot HART PMP Address Bits: 54 Boot HART MHPM Count : 0 Boot HART MHPM Count : 0 Boot HART MIDELEG : 0x0000000000000222 Boot HART MEDELEG : 0x000000000000b109 [ 0.000000] Linux version 5.14.0 (root@2d75d24508a3) (riscv64-linux-gnu-gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0, GNU ld (GNU Binutils for Ubuntu) 2.30) #23 Wed Oct 20 02:33:31 UTC 2021 [ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x80200000 [ 0.000000] Machine model: riscv-virtio,qemu [ 0.000000] earlycon: sbi0 at I/O port 0x0 (options '') [ 0.000000] printk: bootconsole [sbi0] enabled [ 0.000000] Zone ranges: [ 0.000000] DMA32 [mem 0x0000000080200000-0x0000000087ffffff] [ 0.000000] Normal empty [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000080200000-0x0000000087ffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000080200000-0x0000000087ffffff] [ 0.000000] SBI specification v0.2 detected [ 0.000000] SBI implementation ID=0x1 Version=0x9 [ 0.000000] SBI TIME extension detected [ 0.000000] SBI IPI extension detected [ 0.000000] SBI RFENCE extension detected [ 0.000000] riscv: ISA extensions acdfimsu [ 0.000000] riscv: ELF capabilities acdfim [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 31815 [ 0.000000] Kernel command line: earlycon=sbi [ 0.000000] Dentry cache hash table entries: 16384 (order: 5, 131072 bytes, linear) [ 0.000000] Inode-cache hash table entries: 8192 (order: 4, 65536 bytes, linear) [ 0.000000] Sorting __ex_table... [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
根据epc 定位linux kernel panic 位置
https://blog.csdn.net/han_dawei/article/details/41846055
root@centos7 linux-5.14]# riscv64-unknown-elf-objdump -dr vmlinux.o > linux-dr [root@centos7 linux-5.14]# cat System.map | grep -i rand_in ffffffff802148e0 T rand_initialize [root@centos7 linux-5.14]# vi linux-dr
Get ready to debug
Now we have all the componenents needed to begin debugging Haiku’s bootloader.
Boot u-boot + Haiku in qemu-system-riscv64
qemu-system-riscv64 -bios /tmp/riscv64-build/u-boot.bin \
-M virt -m 4G \
-drive file=haiku-mmc.image,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 \
-s -S
-bios ...- The bios is the u-boot bios you compiled
-M virt- A standardized “qemu riscv64 machine”
-m 4G- 4 GiB of memory
-drive- Haiku’s disk image (contains our EFI bootloader, and Haiku’s filesystem)
-s- Listen for GDB connections on 127.0.0.1:1234
-S- Halt boot until GDB says to begin running
At this point, qemu will “wait” for your command to start running.
qemu-system-riscv64 -nographic -machine virt -bios fw_jump.elf -kernel /root/riscv_debug/linux-5.14/arch/riscv/boot/Image -append root=/dev/vda ro console=ttyS0 -drive file=rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -s -S
qemu-system-riscv64 -nographic -machine virt -bios fw_jump.elf -kernel /root/riscv_debug/linux-5.14/arch/riscv/boot/Image -append root=/dev/vda ro console=ttyS0 -drive file=rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -S -gdb tcp::1234
qemu-system-riscv64 -nographic -machine virt -bios fw_jump.elf -kernel /root/riscv_debug/linux-5.14/arch/riscv/boot/Image -append root=/dev/vda ro console=ttyS0 -drive file=rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -s -S
[root@centos7 images]# bash start-qemu.sh qemu-system-riscv64: GLib: g_mapped_file_unref: assertion 'file != NULL' failed qemu-system-riscv64: could not load kernel '/root/riscv_debug/linux-5.14/vmlinux.o'
Attach GDB
Now, we attach to qemu from GDB, and start debugging!
TIP: The hex addresses below could change over time. If you don’t get debugging symbols (aka source-code view of what’s happening) you’ll need to “figure the new addresses out”. I’ve included some basic information on how I got them.
- Start gdb for your architecture
riscv64-elf-gdb /tmp/riscv64-build/u-booton ArchLinux
- Connect to qemu
target extended-remote 127.0.0.1:1234
- Tell gdb where u-boot symbols should be loaded
add-symbol-file /tmp/riscv64-build/u-boot 0xfff66000- This hex value came from booting u-boot, and typing
bdinfofor the “reloc addr”
- Tell gdb where our EFI bootloader symbols should be loaded
add-symbol-file .../generated.riscv64/objects/haiku/riscv64/debug_1/system/boot/efi/boot_loader_efi 0xfe6b0000- This hex value came from compiling u-boot with full tracing, and looking where u-boot puts our EFI bootloader in memory.
EFI: Entry efi_load_image, ..., EFI: efi_add_memory_map_pg: 0xfe6b0000 0x60 1 yes
These important commands can be placed into a text file, and passed to gdb on every startup via:
riscv64-elf-gdb -x (file) /tmp/riscv64-build/u-boot
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux.o GNU gdb (GDB) 11.1 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux.o... (gdb) target remote :1234 Remote debugging using :1234 warning: Can not parse XML target description; XML support was disabled at compile time 0x000000008000bcd8 in ?? () (gdb) b rand_initialize Breakpoint 1 at 0x20dac8: file drivers/char/random.c, line 1779. (gdb) c Continuing. ^C Program received signal SIGINT, Interrupt. 0x000000008000bcd8 in ?? () (gdb) quit A debugging session is active. Inferior 1 [process 1] will be detached. Quit anyway? (y or n) y Detaching from program: /root/riscv_debug/linux-5.14/vmlinux.o, process 1 Ending remote debugging. [Inferior 1 (process 1) detached
Start debugging!
You’ll generally get “one shot” at debugging. If you hit a hard lockup, you’ll likely need to exit gdb, and qemu, and repeat the two sections above.
I’ve heard there are some “extended-remote” commands allowing you to restart from within gdb, however I haven’t figured them out yet :-)
Breakpoints
You can set a breakpoint to “stop” execution at a fixed function. Since we have u-boot’s symbols AND Haiku’s bootloader symbols you can pass any function from the two.
break _relocate– Stop when GDB sees Haiku’s EFI relocate function getting called.
Watchpoints
You can set a watchpoint to “stop” when a value is read, written, or matches an expression.
watch foo– Stop when the program writes to a variable called “foo”rwatch foo– Stop when the program reads from a variable called “foo”
Cleanup
Sometimes you’ll want to adjust breakpoints/watchpoints
info watchpoints– Show all watchpointsinfo breakpoints– Show all breakpointsdelete– Delete all watchpoints/breakpoints
Begin Debugging
Now that you have defined some “stuff to do”, you can start execution.
continue/c- Start qemu running until GDB “stops” based on conditions above, or user presses
<ctl> + <c>in GDB
- Start qemu running until GDB “stops” based on conditions above, or user presses
<ctl> + <c>- Pause qemu, return control to GDB
step/s- Continue until control reaches a different source line, then stop it and return control to GDB
More details on how to use GDB controls can be found in their online docs
file xx.elf : 导入要调试的elf add-symbol-file xx.elf : 将elf的符号导入 add-symbol-file xx.elf 0x80200000 : 将elf的符号导入，并指定地址 target remote :1234 : 连接远程gdb server stepi : 单步执行，每次执行一个指令，会跟踪进入函数 stepi 4 : 单步执行，走4步 tbreak *0x80200000: 在内存0x80200000地址添加一个临时断点 x 0x80200000 : 查看0x80200000地址的值 info registers a3 : 查看寄存器a3的值 print xx : 查看xx变量的值
(gdb) add-symbol-file vmlinux.o add symbol table from file "vmlinux.o" (y or n) y Reading symbols from vmlinux.o... (gdb) target remote :1234 Remote debugging using :1234 warning: Can not parse XML target description; XML support was disabled at compile time handle_exception () at arch/riscv/kernel/entry.S:251 warning: Source file is more recent than executable. 251 REG_L s0, TASK_TI_FLAGS(tp) /* current_thread_info->flags */ (gdb) b init_std_data Breakpoint 1 at 0x20daf0: file ./include/linux/timekeeping.h, line 79.
riscv64-unknown-elf-gdb vmlinux
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux GNU gdb (GDB) 11.1 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux... (gdb) hbreak init_std_data No hardware breakpoint support in the target. (gdb) add-symbol-file vmlinux add symbol table from file "vmlinux" (y or n) y
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux GNU gdb (GDB) 11.1 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux... (gdb) target remote :1234 Remote debugging using :1234 warning: Can not parse XML target description; XML support was disabled at compile time 0x0000000000001000 in ?? () (gdb) add-symbol-file vmlinux add symbol table from file "vmlinux" (y or n) y Reading symbols from vmlinux... (gdb) hbreak start_kernel Hardware assisted breakpoint 1 at 0xffffffff8080066a: file init/main.c, line 917. (gdb) hbreak init_std_data Hardware assisted breakpoint 2 at 0xffffffff8081a3fa: file ./include/linux/timekeeping.h, line 79. (gdb) c Continuing. Breakpoint 1, start_kernel () at init/main.c:917 917 { (gdb) c Continuing. Breakpoint 2, init_std_data (r=0xffffffff8129c1b8 <input_pool>) at drivers/char/random.c:1752 1752 ktime_t now = ktime_get_real(); (gdb) bt #0 init_std_data (r=0xffffffff8129c1b8 <input_pool>) at drivers/char/random.c:1752 #1 rand_initialize () at drivers/char/random.c:1780 #2 0xffffffff80800b2e in start_kernel () at init/main.c:1035 #3 0xffffffff8000116a in _start_kernel () at arch/riscv/kernel/head.S:327 Backtrace stopped: frame did not save the PC (gdb) list 1747 * as that can only decrease the entropy in the pool. 1748 */ 1749 static void __init init_std_data(struct entropy_store *r) 1750 { 1751 int i; 1752 ktime_t now = ktime_get_real(); 1753 unsigned long rv; 1754 1755 mix_pool_bytes(r, &now, sizeof(now)); 1756 for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) { (gdb)
Backtrace stopped: frame did not save the PC (gdb) list 1747 * as that can only decrease the entropy in the pool. 1748 */ 1749 static void __init init_std_data(struct entropy_store *r) 1750 { 1751 int i; 1752 ktime_t now = ktime_get_real(); 1753 unsigned long rv; 1754 1755 mix_pool_bytes(r, &now, sizeof(now)); 1756 for (i = r->poolinfo->poolbytes; i > 0; i -= sizeof(rv)) { (gdb) c Continuing.
重新编译内核
make ARCH=riscv CROSS_COMPILE=riscv64-unknown-elf- defconfig
Kernel hacking —> Compile-time checks and compiler options —> [ ] Compile the kernel with debug info
make ARCH=riscv CROSS_COMPILE=riscv64-unknown-elf- j128
buildrootfs 起来
[ 1.250697] usbcore: registered new interface driver uas [ 1.252240] usbcore: registered new interface driver usb-storage [ 1.254922] mousedev: PS/2 mouse device common for all mice [ 1.258399] sdhci: Secure Digital Host Controller Interface driver [ 1.258900] sdhci: Copyright(c) Pierre Ossman [ 1.259904] sdhci-pltfm: SDHCI platform and OF driver helper [ 1.261902] usbcore: registered new interface driver usbhid [ 1.262394] usbhid: USB HID core driver [ 1.266727] NET: Registered PF_INET6 protocol family [ 1.291337] Segment Routing with IPv6 [ 1.293531] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver [ 1.303138] NET: Registered PF_PACKET protocol family [ 1.308585] 9pnet: Installing 9P2000 support [ 1.310025] Key type dns_resolver registered [ 1.316497] debug_vm_pgtable: [debug_vm_pgtable ]: Validating architecture page table helpers [ 1.363218] EXT4-fs (vda): mounting ext2 file system using the ext4 subsystem [ 1.387067] EXT4-fs (vda): mounted filesystem without journal. Opts: (null). Quota mode: disabled. [ 1.388731] VFS: Mounted root (ext2 filesystem) readonly on device 254:0. [ 1.395819] devtmpfs: mounted [ 1.587835] Freeing unused kernel image (initmem) memory: 2152K [ 1.589171] Run /sbin/init as init process [ 1.806038] EXT4-fs (vda): re-mounted. Opts: (null). Quota mode: disabled. Starting syslogd: OK Starting klogd: OK Running sysctl: OK Saving random seed: [ 3.244781] random: dd: uninitialized urandom read (512 bytes read) OK Starting network: Waiting for interface eth0 to appear............... timeout! run-parts: /etc/network/if-pre-up.d/wait_iface: exit status 1 FAIL Welcome to Buildroot buildroot login:
采用编译前的内核
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux
GNU gdb (GDB) 11.1
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from vmlinux...
(gdb) target remote :1234
Remote debugging using :1234
warning: Can not parse XML target description; XML support was disabled at compile time
0x0000000000001000 in ?? ()
(gdb) add-symbol-file vmlinux
add symbol table from file "vmlinux"
(y or n) y
Reading symbols from vmlinux...
(gdb) b init_std_data
Breakpoint 1 at 0xffffffff80214908: file ./include/linux/timekeeping.h, line 79.
(gdb) c
Continuing.
Breakpoint 1, init_std_data (r=<optimized out>) at drivers/char/random.c:1752
warning: Source file is more recent than executable.
1752 ktime_t now = ktime_get_real();
(gdb) bt
#0 init_std_data (r=<optimized out>) at drivers/char/random.c:1752
#1 rand_initialize () at drivers/char/random.c:1780
#2 0xffffffff80200f14 in start_kernel () at init/main.c:1035
#3 0xffffffff8000016c in _start_kernel () at arch/riscv/kernel/head.S:327
Backtrace stopped: frame did not save the PC
(gdb) c
Continuing.
卡到这里不动了
A[ 0.000000] random: get_random_bytes called from start_kernel+0x4c4/0x6d0 with crng_init=0 [ 0.000000] riscv_timer_init_dt: Registering clocksource cpuid [0] hartid [0] [ 0.000000] clocksource: riscv_clocksource: mask: 0xffffffffffffffff max_cycles: 0x24e6a1710, max_idle_ns: 440795202120 ns [ 0.000209] sched_clock: 64 bits at 10MHz, resolution 100ns, wraps every 4398046511100ns BGHI[ 0.013085] Console: colour dummy device 80x25 [ 0.014272] printk: console [tty0] enabled [ 0.015779] printk: bootconsole [sbi0] disabled J
vmlinux-gdb.py
[root@centos7 linux-5.14]# find ./ -name vmlinux-gdb.py ./scripts/gdb/vmlinux-gdb.py
Add the script file to GDB’s auto load path so that you can later use the lx-* helper commands. Some descriptions about the commands can be found here 2.
echo "add-auto-load-safe-path path/to/linux-v.x.y/vmlinux-gdb.py" >> ~/.gdbinit
[root@centos7 linux-5.14]# echo "add-auto-load-safe-path /root/riscv_debug/linux-5.14/scripts/gdb/vmlinux-gdb.py" >> ~/.gdbinit [root@centos7 linux-5.14]#
[root@centos7 linux-5.14]# riscv64-unknown-elf-gdb vmlinux GNU gdb (GDB) 11.1 Copyright (C) 2021 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=aarch64-unknown-linux-gnu --target=riscv64-unknown-elf". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from vmlinux... (gdb) target remote :1234 Remote debugging using :1234 warning: Can not parse XML target description; XML support was disabled at compile time 0x0000000000001000 in ?? () (gdb) add-symbol-file vmlinux add symbol table from file "vmlinux" (y or n) y Reading symbols from vmlinux... (gdb) hb init_std_data Hardware assisted breakpoint 1 at 0xffffffff80214908: file ./include/linux/timekeeping.h, line 79. (gdb) hbreak start_kernel Hardware assisted breakpoint 2 at 0xffffffff80200a80: file init/main.c, line 917. (gdb) c Continuing. Breakpoint 2, start_kernel () at init/main.c:917 warning: Source file is more recent than executable. 917 { (gdb) bt #0 start_kernel () at init/main.c:917 #1 0xffffffff8000016c in _start_kernel () at arch/riscv/kernel/head.S:327 Backtrace stopped: frame did not save the PC (gdb) list 912 pr_notice("Unknown command line parameters:%s\n", unknown_options); 913 memblock_free(__pa(unknown_options), len); 914 } 915 916 asmlinkage __visible void __init __no_sanitize_address start_kernel(void) 917 { 918 char *command_line; 919 char *after_dashes; 920 921 set_task_stack_end_magic(&init_task); (gdb)
Examples of using the Linux-provided gdb helpers
-
Load module (and main kernel) symbols:
(gdb) lx-symbols loading vmlinux scanning for modules in /home/user/linux/build loading @0xffffffffa0020000: /home/user/linux/build/net/netfilter/xt_tcpudp.ko loading @0xffffffffa0016000: /home/user/linux/build/net/netfilter/xt_pkttype.ko loading @0xffffffffa0002000: /home/user/linux/build/net/netfilter/xt_limit.ko loading @0xffffffffa00ca000: /home/user/linux/build/net/packet/af_packet.ko loading @0xffffffffa003c000: /home/user/linux/build/fs/fuse/fuse.ko ... loading @0xffffffffa0000000: /home/user/linux/build/drivers/ata/ata_generic.ko
-
Set a breakpoint on some not yet loaded module function, e.g.:
(gdb) b btrfs_init_sysfs Function "btrfs_init_sysfs" not defined. Make breakpoint pending on future shared library load? (y or [n]) y Breakpoint 1 (btrfs_init_sysfs) pending.
-
Continue the target:
(gdb) c
-
Load the module on the target and watch the symbols being loaded as well as the breakpoint hit:
loading @0xffffffffa0034000: /home/user/linux/build/lib/libcrc32c.ko loading @0xffffffffa0050000: /home/user/linux/build/lib/lzo/lzo_compress.ko loading @0xffffffffa006e000: /home/user/linux/build/lib/zlib_deflate/zlib_deflate.ko loading @0xffffffffa01b1000: /home/user/linux/build/fs/btrfs/btrfs.ko Breakpoint 1, btrfs_init_sysfs () at /home/user/linux/fs/btrfs/sysfs.c:36 36 btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); -
Dump the log buffer of the target kernel:
(gdb) lx-dmesg [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.8.0-rc4-dbg+ (... [ 0.000000] Command line: root=/dev/sda2 resume=/dev/sda1 vga=0x314 [ 0.000000] e820: BIOS-provided physical RAM map: [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved ....
-
Examine fields of the current task struct:
(gdb) p $lx_current().pid $1 = 4998 (gdb) p $lx_current().comm $2 = "modprobe\000\000\000\000\000\000\000"
-
Make use of the per-cpu function for the current or a specified CPU:
(gdb) p $lx_per_cpu("runqueues").nr_running $3 = 1 (gdb) p $lx_per_cpu("runqueues", 2).nr_running $4 = 0 -
Dig into hrtimers using the container_of helper:
(gdb) set $next = $lx_per_cpu("hrtimer_bases").clock_base[0].active.next (gdb) p *$container_of($next, "struct hrtimer", "node") $5 = { node = { node = { __rb_parent_color = 18446612133355256072, rb_right = 0x0 <irq_stack_union>, rb_left = 0x0 <irq_stack_union> }, expires = { tv64 = 1835268000000 } }, _softexpires = { tv64 = 1835268000000 }, function = 0xffffffff81078232 <tick_sched_timer>, base = 0xffff88003fd0d6f0, state = 1, start_pid = 0, start_site = 0xffffffff81055c1f <hrtimer_start_range_ns+20>, start_comm = "swapper/2\000\000\000\000\000\000" }
List of commands and functions
The number of commands and convenience functions may evolve over the time, this is just a snapshot of the initial version:
(gdb) apropos lx
function lx_current -- Return current task
function lx_module -- Find module by name and return the module variable
function lx_per_cpu -- Return per-cpu variable
function lx_task_by_pid -- Find Linux task by PID and return the task_struct variable
function lx_thread_info -- Calculate Linux thread_info from task variable
lx-dmesg -- Print Linux kernel log buffer
lx-lsmod -- List currently loaded modules
lx-symbols -- (Re-)load symbols of Linux kernel and currently loaded modules
Detailed help can be obtained via "help <command-name>" for commands and "help function <function-name>" for convenience functions.
github
mkdir /opt/riscv
export RISCV=/opt/riscv
[root@centos7 ~]# git clone --recursive https://github.com/riscv/riscv-gnu-toolchain.git Cloning into 'riscv-gnu-toolchain'... remote: Enumerating objects: 7901, done. remote: Counting objects: 100% (363/363), done. remote: Compressing objects: 100% (325/325), done. remote: Total 7901 (delta 49), reused 307 (delta 35), pack-reused 7538 Receiving objects: 100% (7901/7901), 5.48 MiB | 3.93 MiB/s, done. Resolving deltas: 100% (3769/3769), done. Submodule 'qemu' (https://git.qemu.org/git/qemu.git) registered for path 'qemu' Submodule 'riscv-binutils' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-binutils' Submodule 'riscv-dejagnu' (https://github.com/riscv-collab/riscv-dejagnu.git) registered for path 'riscv-dejagnu' Submodule 'riscv-gcc' (https://github.com/riscv-collab/riscv-gcc.git) registered for path 'riscv-gcc' Submodule 'riscv-gdb' (https://github.com/riscv-collab/riscv-binutils-gdb.git) registered for path 'riscv-gdb' Submodule 'riscv-glibc' (git://sourceware.org/git/glibc.git) registered for path 'riscv-glibc' Submodule 'riscv-newlib' (git://sourceware.org/git/newlib-cygwin.git) registered for path 'riscv-newlib' Cloning into 'qemu'... cd riscv-gnu-toolchainerror: RPC failed; result=22, HTTP code = 422 fatal: The remote end hung up unexpectedly Clone of 'https://git.qemu.org/git/qemu.git' into submodule path 'qemu' failed [root@centos7 ~]# cd riscv-gnu-toolchain [root@centos7 riscv-gnu-toolchain]# mkdir build; cd build [root@centos7 build]# ../configure --prefix=$RISCV --enable-multilib checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for grep that handles long lines and -e... /usr/bin/grep checking for fgrep... /usr/bin/grep -F checking for grep that handles long lines and -e... (cached) /usr/bin/grep checking for bash... /bin/sh checking for __gmpz_init in -lgmp... yes checking for mpfr_init in -lmpfr... yes checking for mpc_init2 in -lmpc... yes checking for curl... /usr/bin/curl checking for wget... /usr/bin/wget checking for ftp... no configure: creating ./config.status config.status: creating Makefile config.status: creating scripts/wrapper/awk/awk config.status: creating scripts/wrapper/sed/sed [root@centos7 build]# make -j96 cd /root/riscv-gnu-toolchain/build/.. && \ flock `git rev-parse --git-dir`/config git submodule init /root/riscv-gnu-toolchain/build/../riscv-gcc/ && \ flock `git rev-parse --git-dir`/config git submodule update /root/riscv-gnu-toolchain/build/../riscv-gcc/ cd /root/riscv-gnu-toolchain/build/.. && \
Debugging Linux Kernel with QEMU + GDB
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