298 lines
7.6 KiB
Groff
298 lines
7.6 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_producer_init.3 2074 2011-10-27 03:34:33Z jkoshy $
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.\"
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.Dd August 20, 2011
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.Os
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.Dt DWARF_PRODUCER_INIT 3
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.Sh NAME
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.Nm dwarf_producer_init
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.Nm dwarf_producer_init_b
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.Nd allocate a DWARF producer descriptor
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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_P_Debug
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.Fo dwarf_producer_init
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.Fa "Dwarf_Unsigned flags"
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.Fa "Dwarf_Callback_Func func"
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.Fa "Dwarf_Handler errhand"
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.Fa "Dwarf_Ptr errarg"
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.Fa "Dwarf_Error *err"
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.Fc
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.Ft Dwarf_P_Debug
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.Fo dwarf_producer_init_b
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.Fa "Dwarf_Unsigned flags"
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.Fa "Dwarf_Callback_Func_b func"
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.Fa "Dwarf_Handler errhand"
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.Fa "Dwarf_Ptr errarg"
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.Fa "Dwarf_Error *error"
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.Fc
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.Sh DESCRIPTION
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These functions allocate and return a
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.Vt Dwarf_P_Debug
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descriptor representing a DWARF producer instance.
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.Pp
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The argument
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.Ar errhand
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should contain the adddress of a function to be called in case of an
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error.
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If this argument is
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.Dv NULL ,
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the default error handling scheme is used, see
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.Xr dwarf 3 .
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.Pp
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The argument
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.Ar errarg
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will be passed to the error handler function when it is invoked.
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.Pp
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The argument
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.Ar err
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references a memory location that would hold a
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.Vt Dwarf_Error
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descriptor in case of an error.
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.Pp
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The argument
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.Ar flags
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specifies additional characteristics of the DWARF producer instance.
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The following flags are recognized:
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.Pp
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.Bl -tag -width "Dv DW_DLC_ISA_MIPS"
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.It Dv DW_DLC_ISA_IA64
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.Pq Deprecated
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The target instruction set architecture is IA64.
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This flag is deprecated.
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Application code should use the
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.Xr dwarf_producer_set_isa 3
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function to specify target instruction set architecture.
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.It Dv DW_DLC_ISA_MIPS
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.Pq Deprecated
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The target instruction set architecture is MIPS.
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This flag is deprecated.
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Application code should use the
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.Xr dwarf_producer_set_isa 3
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function to specify target instruction set architecture.
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.It Dv DW_DLC_SIZE_32
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.Pq Default
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The target address size is 32-bit.
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.It Dv DW_DLC_SIZE_64
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The target address size is 64-bit.
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.It Dv DW_DLC_STREAM_RELOCATIONS
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.Pq Default
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Generate stream relocations.
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.It Dv DW_DLC_SYMBOLIC_RELOCATIONS
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Generate symbolic relocations.
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.It Dv DW_DLC_TARGET_BIGENDIAN
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The target is big endian.
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.It Dv DW_DLC_TARGET_LITTLEENDIAN
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The target is little endian.
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.It Dv DW_DLC_WRITE
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.Pq Required
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Permit writing of DWARF information.
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.El
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.Pp
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The following flags are mutually exclusive.
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.Bl -bullet -compact
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.It
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Flags
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.Dv DW_DLC_ISA_IA64
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and
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.Dv DW_DLC_ISA_MIPS .
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.It
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Flags
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.Dv DW_DLC_SIZE_32
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and
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.Dv DW_DLC_SIZE_64 .
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.It
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Flags
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.Dv DW_DLC_STREAM_RELOCATIONS
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and
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS .
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.It
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Flags
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.Dv DW_DLC_TARGET_BIGENDIAN
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and
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.Dv DW_DLC_TARGET_LITTLEENDIAN .
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.El
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If neither of the flags
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.Dv DW_DLC_TARGET_BIGENDIAN
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and
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.Dv DW_DLC_TARGET_LITTLEENDIAN
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is set, the target's endianness is assumed to be the same as the host's
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endianness.
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.Pp
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Argument
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.Ar func
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should point to an application-provided callback function of type
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.Vt Dwarf_Callback_Func_b .
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The type
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.Vt Dwarf_Callback_Func_b
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is defined in the header file
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.In libdwarf.h
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as:
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.Bd -literal -offset indent
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typedef int (*Dwarf_Callback_Func_b)(char *name, int size,
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Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
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Dwarf_Unsigned info, Dwarf_Unsigned *index, int *error);
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.Ed
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.Pp
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This function is called by the
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.Lb libdwarf
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once for each section in the object file that the library needs to
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create.
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The arguments to this callback function specify the values in the ELF
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section header for the section being created:
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.Pp
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.Bl -tag -width indent -compact -offset indent
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.It Ar name
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The name of the section being created.
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.It Ar size
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The
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.Va sh_size
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value in the section header.
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.It Ar type
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The
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.Va sh_type
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value in the section header.
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.It Ar flags
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The
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.Va sh_flags
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value in the section header.
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.It Ar link
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The
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.Va sh_link
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value in the section header.
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.It Ar info
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The
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.Va sh_info
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value in the section header.
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.El
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.Pp
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On success, the callback function should return the section index
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value of the created section, and set the location pointed to by
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argument
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.Ar index
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to the symbol table index of the symbol that associated with the newly
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created section.
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This symbol table index will be used in relocation entries
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referring to the created section.
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.Pp
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In case of failure, the callback function should return -1 and set the
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location pointed to by argument
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.Ar error
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to an application-defined error code.
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This application returned error code is currently ignored by the
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library.
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.Pp
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Function
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.Fn dwarf_producer_init
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is deprecated.
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Function
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.Fn dwarf_producer_init
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is identical to function
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.Fn dwarf_producer_init_b
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except that the callback function it expects can not properly handle
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arbitrary section symbol index values.
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.Ss Memory Management
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The
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.Vt Dwarf_P_Debug
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instance returned by these functions should be freed using the
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function
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.Fn dwarf_producer_finish .
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.Sh RETURN VALUES
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On success, these functions return the created DWARF producer
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descriptor.
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In case of an error, they return
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.Dv DW_DLV_BADADDR
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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_NO_ENTRY"
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.It Bq Er DW_DLE_ARGUMENT
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Argument
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.Ar func
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was NULL.
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.It Bq Er DW_DLE_ARGUMENT
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The flag
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.Dv DW_DLC_WRITE
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was not set in argument
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.Ar flags .
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.It Bq Er DW_DLE_ARGUMENT
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The flags
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.Dv DW_DLC_SIZE_32
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and
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.Dv DW_DLC_SIZE_64
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were both set in argument
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.Ar flags .
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.It Bq Er DW_DLE_ARGUMENT
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The flags
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.Dv DW_DLC_ISA_IA64
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and
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.Dv DW_DLC_ISA_MIPS
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were both set in argument
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.Ar flags .
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.It Bq Er DW_DLE_ARGUMENT
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The flags
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.Dv DW_DLC_TARGET_BIGENDIAN
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and
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.Dv DW_DLC_TARGET_LITTLEENDIAN
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were both set in argument
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.Ar flags .
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.It Bq Er DW_DLE_ARGUMENT
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The flags
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.Dv DW_DLC_STREAM_RELOCATIONS
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and
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.Dv DW_DLC_SYMBOLIC_RELOCATIONS
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were both set in argument
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.Ar flags .
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.It Bq Er DW_DLE_MEMORY
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An out of memory condition was encountered.
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.El
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.Sh EXAMPLES
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To initialize a
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.Vt Dwarf_P_Debug
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instance for a MIPS32 big endian object, use:
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.Bd -literal -offset indent
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Dwarf_P_Debug dbg;
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Dwarf_Unsigned flags;
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Dwarf_Error de;
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/* ... assume cb_func points to the callback function ... */
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flags = DW_DLC_WRITE | DW_DLC_SIZE_32 | DW_DLC_ISA_MIPS |
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DW_DLC_STREAM_RELOCATIONS | DW_DLC_TARGET_BIGENDIAN;
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if ((dbg = dwarf_producer_init(flags, cb_func, NULL, NULL, &de)) ==
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DW_DLV_BADADDR)
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warnx("dwarf_producer_init failed: %s", dwarf_errmsg(-1));
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.Ed
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.Sh SEE ALSO
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.Xr dwarf 3 ,
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.Xr dwarf_errmsg 3 ,
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.Xr dwarf_producer_finish 3 ,
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.Xr dwarf_producer_set_isa 3 ,
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.Xr dwarf_transform_to_disk_form 3
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