NAME
dwarf_get_fde_info_for_reg —
retrieve
register rule
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_get_fde_info_for_reg(
Dwarf_Fde
fde,
Dwarf_Half table_column,
Dwarf_Addr pc,
Dwarf_Signed
*offset_relevant,
Dwarf_Signed *register_num,
Dwarf_Signed *offset,
Dwarf_Addr
*row_pc,
Dwarf_Error *error);
DESCRIPTION
Function
dwarf_get_fde_info_for_reg() retrieves a register
rule from the register rule table associated with a given FDE descriptor,
given a program counter address and rule column number.
Argument
fde should reference a valid DWARF FDE
descriptor.
Arugment
table_column should hold the column number of the
register rule desired.
Argument
pc should hold the program counter address to be
used to locate the desired register rule row.
On successful execution,
dwarf_get_fde_info_for_reg() stores
information about the register rule found into the locations pointed to by the
arguments
offset_relevant,
register_num,
offset and
row_pc.
If there is an offset value associated with the register rule, the location
pointed to by argument
offset_relevant will be set to 1.
Argument
register_num should point to a location which
will hold the register number associated with the register rule.
Argument
offset should point to a location which will be
set to the offset value associated with the register rule, or to 0 if the
register rule does not have an offset value.
Argument
row_pc should point to a location which will be
set to the lowest program counter address associated with the register rule
found.
If argument
err is not NULL, it will be used to return an
error descriptor in case of an error.
COMPATIBILITY
Function
dwarf_get_fde_info_for_reg() is deprecated since it
only supports DWARF2 frame sections. Applications should instead use function
dwarf_get_fde_info_for_reg3(3)
which supports both DWARF2 and DWARF3 frame sections.
RETURN VALUES
Function
dwarf_get_fde_info_for_reg() returns
DW_DLV_OK
when it succeeds. In case of an error, it
returns
DW_DLV_ERROR
and sets the argument
err.
ERRORS
Function
dwarf_get_fde_info_for_reg() can fail with:
-
-
- [
DW_DLE_ARGUMENT
]
- One of the arguments fde,
offset_relevant, register_num,
offset or row_pc was
NULL.
-
-
- [
DW_DLE_FRAME_TABLE_COL_BAD
]
- The column number provided in argument
table_column was too large.
-
-
- [
DW_DLE_PC_NOT_IN_FDE_RANGE
]
- The program counter value provided in argument
pc did not fall in the range covered by argument
fde.
SEE ALSO
dwarf(3),
dwarf_get_fde_at_pc(3),
dwarf_get_fde_info_for_all_regs(3),
dwarf_get_fde_info_for_all_regs3(3),
dwarf_get_fde_info_for_cfa_reg3(3),
dwarf_get_fde_info_for_reg3(3),
dwarf_get_fde_n(3),
dwarf_set_frame_cfa_value(3),
dwarf_set_frame_rule_table_size(3),
dwarf_set_frame_rule_initial_value(3),
dwarf_set_frame_same_value(3),
dwarf_set_frame_undefined_value(3)