DWARF_ADD_FRAME_FDE(3)                        FreeBSD Library Functions Manual

NAME
     dwarf_add_frame_fde - add a call frame descriptor to a DWARF producer
     instance

LIBRARY
     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS
     #include <libdwarf.h>

     Dwarf_Unsigned
     dwarf_add_frame_fde(Dwarf_P_Debug dbg, Dwarf_P_Fde fde, Dwarf_P_Die die,
         Dwarf_Unsigned cie, Dwarf_Addr virt_addr, Dwarf_Unsigned code_len,
         Dwarf_Unsigned symbol_index, Dwarf_Error *err);

     Dwarf_Unsigned
     dwarf_add_frame_fde_b(Dwarf_P_Debug dbg, Dwarf_P_Fde fde,
         Dwarf_P_Die die, Dwarf_Unsigned cie, Dwarf_Addr virt_addr,
         Dwarf_Unsigned code_len, Dwarf_Unsigned symbol_index,
         Dwarf_Unsigned end_symbol_index, Dwarf_Addr offset_from_end_sym,
         Dwarf_Error *err);

DESCRIPTION
     Function dwarf_add_frame_fde_b() adds the call frame descriptor
     referenced by argument fde to a producer instance.

     Argument dbg should reference a DWARF producer instance allocated using
     dwarf_producer_init(3) or dwarf_producer_init_b(3).

     Argument fde should reference a frame descriptor allocated using
     dwarf_new_fde(3).

     Argument die is ignored by this implementation of the DWARF Access
     Library (libdwarf, -ldwarf).

     Argument cie specifies the index of call frame common information entry
     for the frame descriptor.  Valid indices are those returned by the
     function dwarf_add_frame_cie(3).

     Argument symbol_index specifies the ELF symbol index of the first symbol
     to be used for relocation.

     The meaning of the arguments virt_addr, code_len and offset_from_end_sym
     depend on the value of argument end_symbol_index:

     •   If the argument end_symbol_index is zero, the argument virt_addr
         specifies the relocatable address of the start of the function
         associated with the frame descriptor, the argument code_len specifies
         the size in bytes of the machine instructions for this function, the
         argument symbol_index specifies the ELF symbol to be used for
         relocating the address in argument virt_addr, and the argument
         offset_from_end_symbol is ignored.

     •   If the argument end_symbol_index is non-zero, it specifies the ELF
         symbol index of the second symbol to be used for relocation.  In this
         case, the argument virt_addr specifies an offset from the relocatable
         symbol specified by argument symbol_index, the argument
         offset_from_end_symbol should specify an offset from the symbol named
         by the argument end_symbol_index, and the argument code_len will be
         ignored.  The DW_DLC_SYMBOLIC_RELOCATIONS flag should also have been
         set on the DWARF producer instance.

         Application code can retrieve the relocation entries for the symbol
         pair by calling function dwarf_get_relocation_info(3).  The
         relocation entry for the first symbol will have type
         dwarf_drt_first_of_length_pair and the relocation entry for the
         second symbol will have type dwarf_drt_second_of_length_pair.

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

     Function dwarf_add_frame_fde() is similar to function
     dwarf_add_frame_fde_b() except that it supports only one relocation
     symbol.

RETURN VALUES
     On success, these functions return the index value for the added frame
     descriptor.  In case of an error, these functions return DW_DLV_NOCOUNT
     and set the argument err.

ERRORS
     These functions can fail with:

     [DW_DLE_ARGUMENT]       One of the arguments dbg or fde was NULL.

     [DW_DLE_ARGUMENT]       The frame descriptor referenced by argument fde
                             did not belong to the producer instance
                             referenced by argument dbg.

     [DW_DLE_ARGUMENT]       The common information entry index specified by
                             argument cie was invalid.

     [DW_DLE_ARGUMENT]       Argument end_symbol_index was non-zero, but the
                             flag DW_DLC_SYMBOLIC_RELOCATIONS was not set on
                             the producer instance.

SEE ALSO
     dwarf(3), dwarf_add_fde_inst(3), dwarf_add_frame_cie(3),
     dwarf_fde_cfa_offset(3), dwarf_get_relocation_info(3), dwarf_new_fde(3),
     dwarf_producer_init(3), dwarf_producer_init_b(3)

FreeBSD 13.1-RELEASE-p6       September 26, 2011       FreeBSD 13.1-RELEASE-p6