xref: /freebsd/contrib/elftoolchain/libdwarf/dwarf_get_cie_info.3 (revision ae500c1ff8974130f7f2692772cf288b90349e0d)

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.\" $Id: dwarf_get_cie_info.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd May 29, 2011
.Dt DWARF_GET_CIE_INFO 3
.Os
.Sh NAME
.Nm dwarf_get_cie_info
.Nd retrieve information associated with a CIE descriptor
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft int
.Fo dwarf_get_cie_info
.Fa "Dwarf_Cie cie"
.Fa "Dwarf_Unsigned *cie_byte_len"
.Fa "Dwarf_Small *version"
.Fa "char **augmentation"
.Fa "Dwarf_Unsigned *caf"
.Fa "Dwarf_Unsigned *daf"
.Fa "Dwarf_Half *ra"
.Fa "Dwarf_Ptr *init_inst"
.Fa "Dwarf_Unsigned *inst_len"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_get_cie_info
retrieves the information associated with a given CIE descriptor.
.Pp
Argument
.Ar cie
should reference a valid DWARF CIE descriptor, such as would be
returned by function
.Xr dwarf_get_cie_of_fde 3 .
.Pp
Argument
.Ar cie_byte_len
should point to a location that will hold the length in bytes of
the CIE descriptor itself.
.Pp
Argument
.Ar version
should point to a location that will hold the version number of
the CIE descriptor.
.Pp
Arugment
.Ar augmentation
should point to a location that will be set to a pointer to a
NUL-terminated string containing augmentation data encoded as UTF-8.
.Pp
Argument
.Ar caf
should point to a location that will hold the code alignment
factor recorded in the CIE descriptor.
.Pp
Arugment
.Ar daf
should point to a location that will hold the data alignment
factor recorded in the CIE descriptor.
.Pp
Argument
.Ar ra
should point to a location that will hold the return address
recorded in the CIE descriptor.
.Pp
Argument
.Ar init_inst
should point to a location that will be set to a pointer to an array
of bytes containing the initial instructions associated with the CIE
descriptor.
.Pp
Argument
.Ar inst_len
should point to a location that will hold the length in bytes
of the initial instructions returned in argument
.Ar init_inst .
.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_cie_info
returns
.Dv DW_DLV_OK
when it succeeds.
In case of an error, it returns
.Dv DW_DLV_ERROR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_get_cie_info
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar cie ,
.Ar cie_byte_len ,
.Ar version ,
.Ar augmentation ,
.Ar caf ,
.Ar daf ,
.Ar ra ,
.Ar init_inst
or
.Ar inst_len
was NULL.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_get_cie_index 3 ,
.Xr dwarf_get_cie_of_fde 3 ,
.Xr dwarf_get_fde_at_pc 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