mirror of
https://github.com/freebsd/freebsd-src
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ae500c1ff8
Highlights: - Make sure that only TLS sections are sorted into TLS segment. - Fixed multiple errors in "Section to Segment mapping". - Man page updates - ar improvements - elfcopy: avoid filter_reloc uninitialized variable for rela - elfcopy: avoid stripping relocations from static binaries - readelf: avoid printing directory in front of absolute path - readelf: add NT_FREEBSD_FEATURE_CTL FreeBSD note type - test improvements NOTES: Some of these changes originated in FreeBSD and simply reduce diffs between contrib and vendor. ELF Tool Chain ar is not (currently) used in FreeBSD, and there are improvements in both FreeBSD and ELF Tool Chain ar that are not in the other. Sponsored by: The FreeBSD Foundation
202 lines
5.5 KiB
Groff
202 lines
5.5 KiB
Groff
.\" Copyright (c) 2011 Kai Wang
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: dwarf_add_frame_fde.3 3640 2018-10-14 14:09:13Z jkoshy $
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.\"
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.Dd September 26, 2011
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.Dt DWARF_ADD_FRAME_FDE 3
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.Os
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.Sh NAME
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.Nm dwarf_add_frame_fde
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.Nd add a call frame descriptor to a DWARF producer instance
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.Sh LIBRARY
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.Lb libdwarf
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.Sh SYNOPSIS
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.In libdwarf.h
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.Ft "Dwarf_Unsigned"
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.Fo dwarf_add_frame_fde
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_P_Fde fde"
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.Fa "Dwarf_P_Die die"
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.Fa "Dwarf_Unsigned cie"
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.Fa "Dwarf_Addr virt_addr"
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.Fa "Dwarf_Unsigned code_len"
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.Fa "Dwarf_Unsigned symbol_index"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft "Dwarf_Unsigned"
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.Fo dwarf_add_frame_fde_b
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.Fa "Dwarf_P_Debug dbg"
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.Fa "Dwarf_P_Fde fde"
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.Fa "Dwarf_P_Die die"
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.Fa "Dwarf_Unsigned cie"
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.Fa "Dwarf_Addr virt_addr"
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.Fa "Dwarf_Unsigned code_len"
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.Fa "Dwarf_Unsigned symbol_index"
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.Fa "Dwarf_Unsigned end_symbol_index"
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.Fa "Dwarf_Addr offset_from_end_sym"
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.Fa "Dwarf_Error *err"
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.Fc
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.Sh DESCRIPTION
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Function
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.Fn dwarf_add_frame_fde_b
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adds the call frame descriptor referenced by argument
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.Ar fde
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to a producer instance.
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.Pp
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Argument
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.Ar dbg
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should reference a DWARF producer instance allocated using
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.Xr dwarf_producer_init 3
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or
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.Xr dwarf_producer_init_b 3 .
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.Pp
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Argument
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.Ar fde
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should reference a frame descriptor allocated using
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.Xr dwarf_new_fde 3 .
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.Pp
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Argument
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.Ar die
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is ignored by this implementation of the
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.Lb libdwarf .
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.Pp
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Argument
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.Ar cie
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specifies the index of call frame common information entry for
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the frame descriptor.
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Valid indices are those returned by the function
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.Xr dwarf_add_frame_cie 3 .
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.Pp
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Argument
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.Ar symbol_index
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specifies the ELF symbol index of the first symbol to be used for
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relocation.
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.Pp
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The meaning of the arguments
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.Ar virt_addr ,
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.Ar code_len
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and
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.Ar offset_from_end_sym
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depend on the value of argument
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.Ar end_symbol_index :
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.Bl -bullet
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.It
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If the argument
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.Ar end_symbol_index
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is zero, the argument
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.Ar virt_addr
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specifies the relocatable address of the start of the function
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associated with the frame descriptor, the argument
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.Ar code_len
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specifies the size in bytes of the machine instructions for this
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function, the argument
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.Ar symbol_index
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specifies the ELF symbol to be used for relocating the address in
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argument
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.Ar virt_addr ,
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and the argument
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.Ar offset_from_end_symbol
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is ignored.
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.It
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If the argument
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.Ar end_symbol_index
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is non-zero, it specifies the ELF symbol index of the second symbol to
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be used for relocation.
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In this case, the argument
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.Ar virt_addr
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specifies an offset from the relocatable symbol specified by argument
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.Ar symbol_index ,
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the argument
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.Ar offset_from_end_symbol
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should specify an offset from the symbol named by the argument
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.Ar end_symbol_index ,
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and the argument
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.Ar code_len
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will be ignored.
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The
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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flag should also have been set on the DWARF producer instance.
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.Pp
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Application code can retrieve the relocation entries for the symbol
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pair by calling function
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.Xr dwarf_get_relocation_info 3 .
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The relocation entry for the first symbol will have type
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.Dv dwarf_drt_first_of_length_pair
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and the relocation entry for the second symbol will have type
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.Dv dwarf_drt_second_of_length_pair .
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.El
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.Pp
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If argument
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.Ar err
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is not NULL, it will be used to store error information in case
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of an error.
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.Pp
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Function
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.Fn dwarf_add_frame_fde
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is similar to function
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.Fn dwarf_add_frame_fde_b
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except that it supports only one relocation symbol.
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.Sh RETURN VALUES
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On success, these functions return the index value for
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the added frame descriptor.
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In case of an error, these functions return
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.Dv DW_DLV_NOCOUNT
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and set the argument
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.Ar err .
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.Sh ERRORS
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These functions can fail with:
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.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
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.It Bq Er DW_DLE_ARGUMENT
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One of the arguments
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.Ar dbg
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or
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.Ar fde
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was NULL.
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.It Bq Er DW_DLE_ARGUMENT
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The frame descriptor referenced by argument
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.Ar fde
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did not belong to the producer instance referenced by argument
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.Ar dbg .
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.It Bq Er DW_DLE_ARGUMENT
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The common information entry index specified by argument
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.Ar cie
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was invalid.
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.It Bq Er DW_DLE_ARGUMENT
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Argument
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.Ar end_symbol_index
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was non-zero, but the flag
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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was not set on the producer instance.
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.El
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_add_fde_inst 3 ,
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.Xr dwarf_add_frame_cie 3 ,
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.Xr dwarf_fde_cfa_offset 3 ,
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.Xr dwarf_get_relocation_info 3 ,
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.Xr dwarf_new_fde 3 ,
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.Xr dwarf_producer_init 3 ,
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.Xr dwarf_producer_init_b 3
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