最近在调试T20的内存，使用的指令在此记录一下

1. pmap指令查看指定进程中的内存分布。该指令需要在busybox中开启

pmap -x 111

2.应用与so需要执行strip操作，可以减小存储空间的大小

mips-linux-gnu-strip libsysutils.so

3.nm指令和file指令可以查看应用和so是否为strip的

nm libzbar.so.0.2.0

nm: libzbar.so.0.2.0: no symbols

file libzbar.so.0.2.0

libzbar.so.0.2.0: ELF 32-bit LSB  shared object, MIPS, MIPS32 rel2 version 1 (SYSV), dynamically linked, stripped

4.mips-linux-gnu-readelf可以查看so的编译依赖的库文件

mips-linux-gnu-readelf -d libzbar.so.0.2.0

输出如下：

Dynamic section at offset 0x12c contains 22 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libpthread.so.0]
 0x00000001 (NEEDED)                     Shared library: [libc.so.0]
 0x0000000e (SONAME)                     Library soname: [libzbar.so.0]
 0x0000000c (INIT)                       0x2210
 0x0000000d (FINI)                       0x223c0
 0x00000004 (HASH)                       0x20c
 0x00000005 (STRTAB)                     0x12bc
 0x00000006 (SYMTAB)                     0x70c
 0x0000000a (STRSZ)                      3513 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x00000003 (PLTGOT)                     0x35190
 0x00000011 (REL)                        0x2078
 0x00000012 (RELSZ)                      400 (bytes)
 0x00000013 (RELENT)                     8 (bytes)
 0x70000001 (MIPS_RLD_VERSION)           1
 0x70000005 (MIPS_FLAGS)                 NOTPOT
 0x70000006 (MIPS_BASE_ADDRESS)          0x0
 0x7000000a (MIPS_LOCAL_GOTNO)           85
 0x70000011 (MIPS_SYMTABNO)              187
 0x70000012 (MIPS_UNREFEXTNO)            25
 0x70000013 (MIPS_GOTSYM)                0x34
 0x00000000 (NULL)                       0x0

mips-linux-gnu-readelf -d iCamera 

输出如下：

Dynamic section at offset 0x160 contains 49 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libssl.so.1.0.0]
 0x00000001 (NEEDED)                     Shared library: [libzbar.so.0]
 0x00000001 (NEEDED)                     Shared library: [liblogserver.so]
 0x00000001 (NEEDED)                     Shared library: [libstdc++.so.6]
 0x00000001 (NEEDED)                     Shared library: [libcrypto.so.1.0.0]
 0x00000001 (NEEDED)                     Shared library: [libfftw3.so.3]
 0x00000001 (NEEDED)                     Shared library: [libcurl.so.4]
 0x00000001 (NEEDED)                     Shared library: [libfaac.so.0]
 0x00000001 (NEEDED)                     Shared library: [libmp4v2.so.2]
 0x00000001 (NEEDED)                     Shared library: [libIOTCAPIs.so]
 0x00000001 (NEEDED)                     Shared library: [libAVAPIs.so]
 0x00000001 (NEEDED)                     Shared library: [libimp.so]
 0x00000001 (NEEDED)                     Shared library: [libsysutils.so]
 0x00000001 (NEEDED)                     Shared library: [libalog.so]
 0x00000001 (NEEDED)                     Shared library: [libaudioProcess.so]
 0x00000001 (NEEDED)                     Shared library: [librt.so.0]
 0x00000001 (NEEDED)                     Shared library: [libpthread.so.0]
 0x00000001 (NEEDED)                     Shared library: [libm.so.0]
 0x00000001 (NEEDED)                     Shared library: [libpaho-mqtt3as.so.1]
 0x00000001 (NEEDED)                     Shared library: [libdl.so.0]
 0x00000001 (NEEDED)                     Shared library: [libc.so.0]
 0x0000000c (INIT)                       0x404a08
 0x0000000d (FINI)                       0x46efb0
 0x00000004 (HASH)                       0x400310
 0x00000005 (STRTAB)                     0x402534
 0x00000006 (SYMTAB)                     0x400d34
 0x0000000a (STRSZ)                      5675 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x70000016 (MIPS_RLD_MAP)               0x550ba0
 0x00000015 (DEBUG)                      0x0
 0x00000003 (PLTGOT)                     0x550bb0
 0x00000011 (REL)                        0x403e80
 0x00000012 (RELSZ)                      32 (bytes)
 0x00000013 (RELENT)                     8 (bytes)
 0x70000001 (MIPS_RLD_VERSION)           1
 0x70000005 (MIPS_FLAGS)                 NOTPOT
 0x70000006 (MIPS_BASE_ADDRESS)          0x400000
 0x7000000a (MIPS_LOCAL_GOTNO)           2
 0x70000011 (MIPS_SYMTABNO)              384
 0x70000012 (MIPS_UNREFEXTNO)            31
 0x70000013 (MIPS_GOTSYM)                0x180
 0x00000014 (PLTREL)                     REL
 0x00000017 (JMPREL)                     0x403ea0
 0x00000002 (PLTRELSZ)                   2920 (bytes)
 0x70000032 (MIPS_PLTGOT)                0x49a9c4
 0x6ffffffe (VERNEED)                    0x403e60
 0x6fffffff (VERNEEDNUM)                 1
 0x6ffffff0 (VERSYM)                     0x403b60
 0x00000000 (NULL)                       0x0