OpenWrt之quilt打补丁

男娘i 2023-06-16 14:54 13阅读 0赞

OpenWrt使用的是quilt工具来制作补丁非传统的diff

[diff和quilt使用方法参考博客][diff_quilt]

[官方quilt文档][quilt]

准备工作

cat > ~/.quiltrc <<EOF QUILT_DIFF_ARGS="--no-timestamps --no-index -p ab --color=auto" QUILT_REFRESH_ARGS="--no-timestamps --no-index -p ab" QUILT_SERIES_ARGS="--color=auto" QUILT_PATCH_OPTS="--unified" QUILT_DIFF_OPTS="-p" EDITOR="vim" EOF

###### 给gdb打补丁修复Remote ‘g’ packet reply is too long ######

准备gdb源码以及patch文件

`make toolchain/gdb/{clean,prepare} V=s QUILT=1`

进入到gdb源码目录

`cd build_dir/toolchain-mipsel_24kec+dsp_gcc-4.8-linaro_uClibc-0.9.33.2/gdb-linaro-7.6-2013.05/`

打上原来的所有补丁

`quilt push -a`

创建新的patch

`quilt new 700-fix-remote-g-packet-reply-too-long.patch`

修改源文件

`quilt edit gdb/remote.c`

--- a/gdb/remote.c
    +++ b/gdb/remote.c
    @@ -6110,8 +6110,19 @@ process_g_packet (struct regcache *regca
       buf_len = strlen (rs->buf);
     
       /* Further sanity checks, with knowledge of the architecture.  */
    -  if (buf_len > 2 * rsa->sizeof_g_packet)
    -    error (_("Remote 'g' packet reply is too long: %s"), rs->buf);
    +  // if (buf_len > 2 * rsa->sizeof_g_packet)
    +  //  error (_("Remote 'g' packet reply is too long: %s"), rs->buf);
    +  if (buf_len > 2 * rsa->sizeof_g_packet) {
    +    rsa->sizeof_g_packet = buf_len;
    +    for (i = 0; i < gdbarch_num_regs (gdbarch); i++) {
    +      if (rsa->regs[i].pnum == -1)
    +        continue;
    +      if (rsa->regs[i].offset >= rsa->sizeof_g_packet)
    +        rsa->regs[i].in_g_packet = 0;
    +      else
    +        rsa->regs[i].in_g_packet = 1;
    +    }
    +  }

查看修改前后对比

`quilt diff`

更新修改到patch文件

`quilt refresh`

返回buildroot目录

`cd -`

打上新的补丁

`make toolchain/gdb/update V=s`

重新编译

`make toolchain/gdb/{clean,compile,install} V=s`

cat ./scripts/remote-gdb

### 示例二：内核打补丁 ###

make target/linux/{ clean,prepare} V=s QUILT=1
    
    cd build_dir/target-mipsel_24kc_musl/linux-ramips_mt76x8/linux-4.14.149/
    
    quilt push -a
    
    quilt new platform/666-reboot-softreset-2-hardreset-by-GPIO5.patch
    
    quilt edit kernel/reboot.c
    quilt edit 其他文件
    
    quilt diff
    
    quilt refresh
    
    make target/linux/update V=s

[diff_quilt]: https://blog.csdn.net/hzlarm/article/details/103179953
[quilt]: https://openwrt.org/docs/guide-developer/build-system/use-patches-with-buildsystem