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download PDF document: dwarf_get_fde_info_for_all_regs.3.pdf

DWARF_GET_FDE_INFO_FOR_ALL_REGS(3) FreeBSD Library Functions Manual
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. 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.
SEE ALSO dwarf(3), dwarf_get_fde_at_pc(3), dwarf_get_fde_info_for_all_regs3(3), dwarf_get_fde_info_for_cfa_reg3(3), dwarf_get_fde_info_for_reg(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)
FreeBSD 14.0-RELEASE-p11 June 4, 2011 FreeBSD 14.0-RELEASE-p11