Functions that deal with offsets. More...
Functions | |
idaman reftype_t ida_export | get_default_reftype (ea_t ea) |
Get default reference type depending on the segment. More... | |
idaman bool ida_export | op_offset_ex (ea_t ea, int n, const refinfo_t *ri) |
Convert operand to a reference. More... | |
idaman bool ida_export | op_offset (ea_t ea, int n, uint32 type_and_flags, ea_t target=BADADDR, ea_t base=0, adiff_t tdelta=0) |
See op_offset_ex() | |
bool | op_plain_offset (ea_t ea, int n, ea_t base) |
Convert operand to a reference with the default reference type. | |
ea_t | get_offbase (ea_t ea, int n) |
Get offset base value. More... | |
idaman int ida_export | get_offset_expression (qstring *buf, ea_t ea, int n, ea_t from, adiff_t offset, int getn_flags=0) |
Get offset expression (in the form "offset name+displ"). More... | |
idaman int ida_export | get_offset_expr (qstring *buf, ea_t ea, int n, const refinfo_t &ri, ea_t from, adiff_t offset, int getn_flags=0) |
See get_offset_expression() | |
idaman ea_t ida_export | can_be_off32 (ea_t ea) |
Does the specified address contain a valid OFF32 value?. More... | |
idaman ea_t ida_export | calc_offset_base (ea_t ea, int n) |
Try to calculate the offset base This function takes into account the fixup information, current ds and cs values. More... | |
idaman ea_t ida_export | calc_probable_base_by_value (ea_t ea, uval_t off) |
Try to calculate the offset base. More... | |
idaman bool ida_export | calc_reference_data (ea_t *target, ea_t *base, ea_t from, const refinfo_t &ri, adiff_t opval) |
Calculate the target and base addresses of an offset expression. More... | |
idaman ea_t ida_export | add_refinfo_dref (const insn_t &insn, ea_t from, const refinfo_t &ri, adiff_t opval, dref_t type, int opoff) |
Add xrefs for a reference from the given instruction (\insn_t{ea}). More... | |
ea_t | calc_target (ea_t from, adiff_t opval, const refinfo_t &ri) |
Calculate the target using the provided refinfo_t. | |
ea_t | calc_target (ea_t from, ea_t ea, int n, adiff_t opval) |
Retrieve refinfo_t structure and calculate the target. | |
ea_t | calc_basevalue (ea_t target, ea_t base) |
Calculate the value of the reference base. | |
Detailed Description
Functions that deal with offsets.
"Being an offset" is a characteristic of an operand. This means that operand or its part represent offset from some address in the program. This linear address is called "offset base". Some operands may have 2 offsets simultaneously. Generally, IDA doesn't handle this except for Motorola outer offsets. Thus there may be two offset values in an operand: simple offset and outer offset.
Outer offsets are handled by specifying special operand number: it should be ORed with OPND_OUTER value.
See bytes.hpp for further explanation of operand numbers.
Function Documentation
◆ get_default_reftype()
idaman reftype_t ida_export get_default_reftype | ( | ea_t | ea | ) |
◆ op_offset_ex()
idaman bool ida_export op_offset_ex | ( | ea_t | ea, |
int | n, | ||
const refinfo_t * | ri | ||
) |
Convert operand to a reference.
To delete an offset, use clr_op_type() function.
- Parameters
-
ea linear address. if 'ea' has unexplored bytes, try to convert them to - no segment: fail
- 16bit segment: to 16bit word data
- 32bit segment: to dword
n operand number (may be ORed with OPND_OUTER) - 0: first
- 1: second
- ...
- 7: eighth operand
- OPND_MASK: all operands
ri reference information
- Returns
- success
◆ get_offbase()
|
inline |
◆ get_offset_expression()
idaman int ida_export get_offset_expression | ( | qstring * | buf, |
ea_t | ea, | ||
int | n, | ||
ea_t | from, | ||
adiff_t | offset, | ||
int | getn_flags = 0 |
||
) |
Get offset expression (in the form "offset name+displ").
This function uses offset translation function ( processor_t::translate) if your IDP module has such a function. Translation function is used to map linear addresses in the program (only for offsets).
Example: suppose we have instruction at linear address 0x00011000:
mov ax, [bx+7422h]
and at ds:7422h:
array dw ...
We want to represent the second operand with an offset expression, so then we call:
get_offset_expresion(0x001100, 1, 0x001102, 0x7422, buf); | | | | | | | | | +output buffer | | | +value of offset expression | | +address offset value in the instruction | +the second operand +address of instruction
and the function will return a colored string:
offset array
- Parameters
-
buf output buffer to hold offset expression ea start of instruction or data with the offset expression n operand number (may be ORed with OPND_OUTER) - 0: first operand
- 1: second operand
- ...
- 7: eighth operand
from linear address of instruction operand or data referring to the name. This address will be used to get fixup information, so it should point to exact position of operand in the instruction. offset value of operand or its part. The function will return text representation of this value as offset expression. getn_flags combination of: - GETN_APPZERO: meaningful only if the name refers to a structure. appends the struct field name if the field offset is zero
- GETN_NODUMMY: do not generate dummy names for the expression but pretend they already exist (useful to verify that the offset expression can be represented)
- Return values
-
0 can't convert to offset expression 1 ok, a simple offset expression 2 ok, a complex offset expression
◆ can_be_off32()
idaman ea_t ida_export can_be_off32 | ( | ea_t | ea | ) |
Does the specified address contain a valid OFF32 value?.
For symbols in special segments the displacement is not taken into account. If yes, then the target address of OFF32 will be returned. If not, then BADADDR is returned.
◆ calc_offset_base()
idaman ea_t ida_export calc_offset_base | ( | ea_t | ea, |
int | n | ||
) |
Try to calculate the offset base This function takes into account the fixup information, current ds and cs values.
- Parameters
-
ea the referencing instruction/data address n operand number - 0: first operand
- 1: second operand
- ...
- 7: eighth operand
- Returns
- output base address or BADADDR
◆ calc_probable_base_by_value()
idaman ea_t ida_export calc_probable_base_by_value | ( | ea_t | ea, |
uval_t | off | ||
) |
Try to calculate the offset base.
2 bases are checked: current ds and cs. If fails, return BADADDR
◆ calc_reference_data()
idaman bool ida_export calc_reference_data | ( | ea_t * | target, |
ea_t * | base, | ||
ea_t | from, | ||
const refinfo_t & | ri, | ||
adiff_t | opval | ||
) |
Calculate the target and base addresses of an offset expression.
The calculated target and base addresses are returned in the locations pointed by 'base' and 'target'. In case 'ri.base' is BADADDR, the function calculates the offset base address from the referencing instruction/data address. The target address is copied from ri.target. If ri.target is BADADDR then the target is calculated using the base address and 'opval'. This function also checks if 'opval' matches the full value of the reference and takes in account the memory-mapping.
- Parameters
-
target output target address base output base address from the referencing instruction/data address ri reference info block from the database opval operand value (usually op_t::value or op_t::addr)
- Returns
- success
◆ add_refinfo_dref()
idaman ea_t ida_export add_refinfo_dref | ( | const insn_t & | insn, |
ea_t | from, | ||
const refinfo_t & | ri, | ||
adiff_t | opval, | ||
dref_t | type, | ||
int | opoff | ||
) |
Add xrefs for a reference from the given instruction (\insn_t{ea}).
This function creates a cross references to the target and the base. insn_t::add_off_drefs() calls this function to create xrefs for 'offset' operand.
- Parameters
-
insn the referencing instruction from the referencing instruction/data address ri reference info block from the database opval operand value (usually op_t::value or op_t::addr) type type of xref opoff offset of the operand from the start of instruction
- Returns
- the target address of the reference
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