How to insert new instruction at specified address in radare2












0














I want to add additional branch instruction at some addresses. I'm using radare2. The problem that insert commands overwrites the original instruction instead of adding new ones!



I tried to :
increase the file size at first by (r+ 4)
add null bytes (wen 4)
and then write (weX) but it didn't work



[0x00400580]> r+4



[0x00400580]> wen 4



[0x00400580]> weX 0x400580 03000094



this the original code and I want to insert (additional)new instruction at 0x400580



0x0040057c 04000014 b 0x40058c



0x00400580 e01f40b9 ldr w0, [sp + arg_1ch]



0x00400584 00040011 add w0, w0, 1



0x00400588 e01f00b9 str w0, [sp + arg_1ch]



I expected it to be



0x0040057c 04000014 b 0x40058c



0x00400580 03000094 bl 0x40058c



0x00400584 e01f40b9 ldr w0, [sp + arg_1ch]



0x00400588 00040011 add w0, w0, 1



0x0040058c e01f00b9 str w0, [sp + arg_1ch]



But actual output was:



0x0040057c 04000014 b 0x40058c



0x00400580 03000094 bl 0x40058c



0x00400584 00040011 add w0, w0, 1



0x00400588 e01f00b9 str w0, [sp + arg_1ch]






armv8 radare2







share|improve this question



























    0














    I want to add additional branch instruction at some addresses. I'm using radare2. The problem that insert commands overwrites the original instruction instead of adding new ones!



    I tried to :
    increase the file size at first by (r+ 4)
    add null bytes (wen 4)
    and then write (weX) but it didn't work



    [0x00400580]> r+4



    [0x00400580]> wen 4



    [0x00400580]> weX 0x400580 03000094



    this the original code and I want to insert (additional)new instruction at 0x400580



    0x0040057c 04000014 b 0x40058c



    0x00400580 e01f40b9 ldr w0, [sp + arg_1ch]



    0x00400584 00040011 add w0, w0, 1



    0x00400588 e01f00b9 str w0, [sp + arg_1ch]



    I expected it to be



    0x0040057c 04000014 b 0x40058c



    0x00400580 03000094 bl 0x40058c



    0x00400584 e01f40b9 ldr w0, [sp + arg_1ch]



    0x00400588 00040011 add w0, w0, 1



    0x0040058c e01f00b9 str w0, [sp + arg_1ch]



    But actual output was:



    0x0040057c 04000014 b 0x40058c



    0x00400580 03000094 bl 0x40058c



    0x00400584 00040011 add w0, w0, 1



    0x00400588 e01f00b9 str w0, [sp + arg_1ch]






    armv8 radare2







    share|improve this question

























      0












      0








      0







      I want to add additional branch instruction at some addresses. I'm using radare2. The problem that insert commands overwrites the original instruction instead of adding new ones!



      I tried to :
      increase the file size at first by (r+ 4)
      add null bytes (wen 4)
      and then write (weX) but it didn't work



      [0x00400580]> r+4



      [0x00400580]> wen 4



      [0x00400580]> weX 0x400580 03000094



      this the original code and I want to insert (additional)new instruction at 0x400580



      0x0040057c 04000014 b 0x40058c



      0x00400580 e01f40b9 ldr w0, [sp + arg_1ch]



      0x00400584 00040011 add w0, w0, 1



      0x00400588 e01f00b9 str w0, [sp + arg_1ch]



      I expected it to be



      0x0040057c 04000014 b 0x40058c



      0x00400580 03000094 bl 0x40058c



      0x00400584 e01f40b9 ldr w0, [sp + arg_1ch]



      0x00400588 00040011 add w0, w0, 1



      0x0040058c e01f00b9 str w0, [sp + arg_1ch]



      But actual output was:



      0x0040057c 04000014 b 0x40058c



      0x00400580 03000094 bl 0x40058c



      0x00400584 00040011 add w0, w0, 1



      0x00400588 e01f00b9 str w0, [sp + arg_1ch]






      armv8 radare2







      share|improve this question













      I want to add additional branch instruction at some addresses. I'm using radare2. The problem that insert commands overwrites the original instruction instead of adding new ones!



      I tried to :
      increase the file size at first by (r+ 4)
      add null bytes (wen 4)
      and then write (weX) but it didn't work



      [0x00400580]> r+4



      [0x00400580]> wen 4



      [0x00400580]> weX 0x400580 03000094



      this the original code and I want to insert (additional)new instruction at 0x400580



      0x0040057c 04000014 b 0x40058c



      0x00400580 e01f40b9 ldr w0, [sp + arg_1ch]



      0x00400584 00040011 add w0, w0, 1



      0x00400588 e01f00b9 str w0, [sp + arg_1ch]



      I expected it to be



      0x0040057c 04000014 b 0x40058c



      0x00400580 03000094 bl 0x40058c



      0x00400584 e01f40b9 ldr w0, [sp + arg_1ch]



      0x00400588 00040011 add w0, w0, 1



      0x0040058c e01f00b9 str w0, [sp + arg_1ch]



      But actual output was:



      0x0040057c 04000014 b 0x40058c



      0x00400580 03000094 bl 0x40058c



      0x00400584 00040011 add w0, w0, 1



      0x00400588 e01f00b9 str w0, [sp + arg_1ch]






      armv8 radare2




      armv8 radare2






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 27 at 13:21









      Sara

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