freebsd-dev/contrib/elftoolchain/libdwarf/dwarf_fde_cfa_offset.3
Ed Maste ae500c1ff8 Update to ELF Tool Chain r3668
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
2019-01-10 14:35:23 +00:00

100 lines
2.9 KiB
Groff

.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_fde_cfa_offset.3 3644 2018-10-15 19:55:01Z jkoshy $
.\"
.Dd September 26, 2011
.Dt DWARF_FDE_CFA_OFFSET 3
.Os
.Sh NAME
.Nm dwarf_fde_cfa_offset
.Nd add a DW_CFA_offset frame instruction to a DWARF frame descriptor
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "Dwarf_P_Fde"
.Fo dwarf_fde_cfa_offset
.Fa "Dwarf_P_Fde fde"
.Fa "Dwarf_Unsigned reg"
.Fa "Dwarf_Signed offset"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_fde_cfa_offset
appends a
.Dv DW_CFA_offset
frame instruction to the frame descriptor referenced by argument
.Ar fde .
.Pp
Argument
.Ar fde
should reference a frame descriptor allocated using
.Xr dwarf_new_fde 3 .
.Pp
Argument
.Ar reg
specifies the register operand for the frame instruction.
.Pp
Argument
.Ar offset
specifies the offset operand for the frame instruction.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case of an
error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_fde_cfa_offset
returns the frame descriptor given in argument
.Ar fde .
In case of an error, function
.Fn dwarf_fde_cfa_offset
returns
.Dv DW_DLV_BADADDR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_fde_cfa_offset
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
Argument
.Ar fde
was NULL.
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of the
function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_add_fde_inst 3 ,
.Xr dwarf_add_frame_cie 3 ,
.Xr dwarf_add_frame_fde 3 ,
.Xr dwarf_add_frame_fde_b 3 ,
.Xr dwarf_new_fde 3