学步园

reference:

http://www.360doc.com/content/09/0623/18/36491_4007725.shtml

http://ftp.gnu.org/pub/old-gnu/Manuals/ld-2.9.1/html_node/ld_toc.html

1. lds的基本格式

1.1section定义

SECTIONS { ...
  secname : {
    contents
  }
... }

2. kernel中的lds使用

gcc 中用-T 加上一个链接文件来描述链接出的elf文件的格式。

2.1 kernel中哪里用到了这个

在scripts/link-vmlinux.sh中有这么个函数

 51 vmlinux_link()
 52 {
 53         local lds="${objtree}/${KBUILD_LDS}"
 54
 55         if [ "${SRCARCH}" != "um" ]; then
 56                
 57                 ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}                  \
 58                         -T ${lds} ${KBUILD_VMLINUX_INIT}                     \
 59                         --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
 60         else
 61                 ${CC} ${CFLAGS_vmlinux} -o ${2}                              \
 62                         -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT}                 \
 63                         -Wl,--start-group                                    \
 64                                  ${KBUILD_VMLINUX_MAIN}                      \
 65                         -Wl,--end-group                                      \
 66                         -lutil ${1}
 67                 rm -f linux
 68         fi
 69 }

看到上面 -T ${lds}了么？ok，就是它了。