NAME

dwarf_get_fde_info_for_all_regs —

retrieve register rule row

LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

#include <libdwarf.h>

int
dwarf_get_fde_info_for_all_regs(Dwarf_Fde fde, Dwarf_Addr pc, Dwarf_Regtable *reg_table, Dwarf_Addr *row_pc, Dwarf_Error *err);

DESCRIPTION

Function dwarf_get_fde_info_for_all_regs() retrieves a row from the register rule table associated with the given FDE descriptor.

Argument fde should reference a valid DWARF FDE descriptor.

Argument pc should hold the program counter address to be used to locate the desired table row.

Argument reg_table should point to a Dwarf_Regtable descriptor which will hold the returned table row of register rules.

Argument row_pc should point to a location which will be set to the lowest program counter address associated with the table row.

If argument err is not NULL, it will be used to store error information in case of an error.

The Dwarf_Regtable descriptor is defined in the header file <libdwarf.h>:

typedef struct {
	struct {
		Dwarf_Small	dw_offset_relevant;
		Dwarf_Half	dw_regnum;
		Dwarf_Addr	dw_offset;
	} rules[DW_REG_TABLE_SIZE];
} Dwarf_Regtable;

For each of the register rules returned, the dw_offset_relevant field is set to 1 if the register rule has a offset value. The dw_regnum field is set to the register number associated with the regsiter rule. The dw_offset field is set to the offset value associated with the register rule.

The number of register columns returned is either the constant value DW_REG_TABLE_SIZE as defined in the header file <libdwarf.h>, or the value set by function dwarf_set_frame_rule_table_size(3), whichever is smaller.

COMPATIBILITY

Function dwarf_get_fde_info_for_all_regs() is deprecated since it only supports DWARF2 frame sections. Applications should instead use function dwarf_get_fde_info_for_all_regs3(3) which supports both DWARF2 and DWARF3 frame sections.

RETURN VALUES

Function dwarf_get_fde_info_for_all_regs() 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_all_regs() can fail with:

[DW_DLE_ARGUMENT]: One of the arguments fde, reg_table or row_pc was NULL.
[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.