The Bastard / Discussion / libdisasm: loop

loop

Forum: libdisasm

Creator: Arta

Created: 2006-09-27

Updated: 2013-04-25

Arta - 2006-09-27

Loop seems to be treated by libdisasm as an unconditional jump -- is that really the best way? Surely a conditional jump would make more sense?

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- Michael Mondragon - 2006-09-30
  
  That looks like a typo in one of the opcode table entries; the other occurrences of loop are all BRANCHCC:
  
  INSN 0    INS_BRANCHCC    ADDRMETH_J | OPTYPE_b | OP_X    ARG_NONE        ARG_NONE        cpu_80386 | isa_GP      "loopnz"        0       0       0      INS_TEST_NZERO         31
  INSN 0    INS_BRANCHCC    ADDRMETH_J | OPTYPE_b | OP_X    ARG_NONE        ARG_NONE        cpu_80386 | isa_GP      "loopz"         0       0       0      INS_TEST_ZERO 31
  INSN 0    INS_BRANCH      ADDRMETH_J | OPTYPE_b | OP_X    ARG_NONE        ARG_NONE        cpu_80386 | isa_GP      "loop"          0       0       0      0 31
  
  I've fixed it in CVS.
  
  Thanks,
  
  _m
  
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