dwarf_get_fde_info_for_reg —
retrieve register rule
DWARF Access Library (libdwarf, -ldwarf)
#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);
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.
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.
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.
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.
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_initial_value(3),
dwarf_set_frame_rule_table_size(3),
dwarf_set_frame_same_value(3),
dwarf_set_frame_undefined_value(3)