# get\_operand\_type

```
Get type of instruction operand
     ea - linear address of instruction
     n  - number of operand:
             0 - the first operand
             1 - the second operand
returns:
     -1      bad operand number passed

long get_operand_type(long ea, long n);

#define o_void        0  // No Operand                           ----------
#define o_reg         1  // General Register (al, ax, es, ds...) reg
#define o_mem         2  // Direct Memory Reference  (DATA)      addr
#define o_phrase      3  // Memory Ref [Base Reg + Index Reg]    phrase
#define o_displ       4  // Memory Reg [Base Reg + Index Reg + Displacement] phrase+addr
#define o_imm         5  // Immediate Value                      value
#define o_far         6  // Immediate Far Address  (CODE)        addr
#define o_near        7  // Immediate Near Address (CODE)        addr
#define o_idpspec0    8  // IDP specific type
#define o_idpspec1    9  // IDP specific type
#define o_idpspec2   10  // IDP specific type
#define o_idpspec3   11  // IDP specific type
#define o_idpspec4   12  // IDP specific type
#define o_idpspec5   13  // IDP specific type

// x86
#define o_trreg         o_idpspec0      // trace register
#define o_dbreg         o_idpspec1      // debug register
#define o_crreg         o_idpspec2      // control register
#define o_fpreg         o_idpspec3      // floating point register
#define o_mmxreg        o_idpspec4      // mmx register
#define o_xmmreg        o_idpspec5      // xmm register

// arm
#define o_reglist       o_idpspec1      // Register list (for LDM/STM)
#define o_creglist      o_idpspec2      // Coprocessor register list (for CDP)
#define o_creg          o_idpspec3      // Coprocessor register (for LDC/STC)
#define o_fpreglist     o_idpspec4      // Floating point register list
#define o_text          o_idpspec5      // Arbitrary text stored in the operand
#define o_cond          (o_idpspec5+1)  // ARM condition as an operand

// ppc
#define o_spr           o_idpspec0      // Special purpose register
#define o_twofpr        o_idpspec1      // Two FPRs
#define o_shmbme        o_idpspec2      // SH & MB & ME
#define o_crf           o_idpspec3      // crfield      x.reg
#define o_crb           o_idpspec4      // crbit        x.reg
#define o_dcr           o_idpspec5      // Device control register
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hex-rays.com/9.0/developer-guide/idc/idc-api-reference/alphabetical-list-of-idc-functions/276.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.