freebsd-skq/contrib/elftoolchain/libdwarf/dwarf_get_fde_at_pc.3
emaste b54d7a9715 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

126 lines
3.6 KiB
Groff

.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_get_fde_at_pc.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd May 22, 2011
.Dt DWARF_GET_FDE_AT_PC 3
.Os
.Sh NAME
.Nm dwarf_get_fde_at_pc
.Nd retrieve the FDE descriptor for an address
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_get_fde_at_pc
.Fa "Dwarf_Fde *fdelist"
.Fa "Dwarf_Addr pc"
.Fa "Dwarf_Fde *ret_fde"
.Fa "Dwarf_Addr *lopc"
.Fa "Dwarf_Addr *hipc"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_get_fde_at_pc
searches the provided array of DWARF FDE descriptors for a descriptor
covering a given program counter address.
.Pp
Argument
.Ar fdelist
should point to an array of FDE descriptors, as returned by the functions
.Xr dwarf_get_fde_list 3
or
.Xr dwarf_get_fde_list_eh 3 .
.Pp
Argument
.Ar pc
should contain the program counter address being looked up.
.Pp
Argument
.Ar ret_fde
should point to a location that will hold the returned FDE descriptor.
.Pp
Argument
.Ar lopc
should point to a location that will be set to the lowest address
covered by the returned FDE descriptor.
.Pp
Argument
.Ar hipc
should point to a location that will be set to the highest address
covered by the returned FDE descriptor.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case of an
error.
.Sh RETURN VALUES
Function
.Fn dwarf_get_fde_at_pc
returns
.Dv DW_DLV_OK
when it succeeds.
It returns
.Dv DW_DLV_NO_ENTRY
if a FDE descriptor that covers the address specified by argument
.Ar pc
is not found.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_get_fde_at_pc
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_NO_ENTRY"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Va fdelist ,
.Va ret_fde ,
.Va lopc ,
or
.Va hipc
was NULL.
.It Bq Er DW_DLE_NO_ENTRY
These was no FDE descriptor covering the address specified by argument
.Ar pc .
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_get_cie_of_fde 3 ,
.Xr dwarf_get_fde_info_for_all_regs 3 ,
.Xr dwarf_get_fde_info_for_all_regs3 3 ,
.Xr dwarf_get_fde_info_for_cfa_reg3 3 ,
.Xr dwarf_get_fde_info_for_reg 3 ,
.Xr dwarf_get_fde_info_for_reg3 3 ,
.Xr dwarf_get_fde_instr_bytes 3 ,
.Xr dwarf_get_fde_list 3 ,
.Xr dwarf_get_fde_list_eh 3 ,
.Xr dwarf_get_fde_n 3 ,
.Xr dwarf_get_fde_range 3