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Diff for /src/external/bsd/elftoolchain/dist/libdwarf/dwarf_get_fde_info_for_reg3.3 between version 1.2.4.1 and 1.2.4.2

version 1.2.4.1, 2014/03/09 16:58:04 version 1.2.4.2, 2014/05/22 15:44:46
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   .\"     $NetBSD$
   .\"
   .\" Copyright (c) 2011 Kai Wang
   .\" All rights reserved.
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   .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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   .\" Id: dwarf_get_fde_info_for_reg3.3 2122 2011-11-09 15:35:14Z jkoshy
   .\"
   .Dd November 9, 2011
   .Os
   .Dt DWARF_GET_FDE_INFO_FOR_REG3 3
   .Sh NAME
   .Nm dwarf_get_fde_info_for_reg3
   .Nd retrieve register rule
   .Sh LIBRARY
   .Lb libdwarf
   .Sh SYNOPSIS
   .In libdwarf.h
   .Ft int
   .Fo dwarf_get_fde_info_for_reg3
   .Fa "Dwarf_Fde fde"
   .Fa "Dwarf_Half table_column"
   .Fa "Dwarf_Addr pc"
   .Fa "Dwarf_Small *type"
   .Fa "Dwarf_Signed *offset_relevant"
   .Fa "Dwarf_Signed *register_num"
   .Fa "Dwarf_Signed *offset_or_block_len"
   .Fa "Dwarf_Ptr *block_ptr"
   .Fa "Dwarf_Addr *row_pc"
   .Fa "Dwarf_Error *error"
   .Fc
   .Sh DESCRIPTION
   Function
   .Fn dwarf_get_fde_info_for_reg3
   retrieves a register rule from the register rule table associated with
   a given FDE descriptor, given a program counter address and rule
   column number.
   .Pp
   Argument
   .Ar fde
   should reference a valid DWARF FDE descriptor.
   .Pp
   Arugment
   .Ar table_column
   should hold the column number of the register rule desired.
   .Pp
   Argument
   .Ar pc
   should hold the program counter address to be used to locate the
   desired register rule row.
   .Pp
   On successful execution,
   .Fn dwarf_get_fde_info_for_reg3
   stores information about the register rule found into the locations
   pointed to by the arguments
   .Ar type ,
   .Ar offset_relevant ,
   .Ar register_num ,
   .Ar offset_or_block_len ,
   .Ar block_ptr
   and
   .Ar row_pc .
   .Pp
   Argument
   .Ar type
   should point to a location which will hold the type code of the
   register rule found.
   The returned value is one of the
   .Dv DW_EXPR_*
   contants defined in the header file
   .In libdwarf.h .
   .Pp
   If there is an offset value associated with the register rule,
   the location pointed to by argument
   .Ar offset_relevant
   will be set to 1.
   .Pp
   Argument
   .Ar register_num
   should point to a location which will hold the register number associated
   with the register rule.
   .Pp
   If the register rule is of type
   .Dv DW_EXPR_OFFSET
   or
   .Dv DW_EXPR_VAL_OFFSET ,
   the location pointed to by argument
   .Ar offset_or_block_len
   will be set to the offset value associated with the register rule,
   or to 0 if the register rule does not have an offset value.
   If the type code is
   .Dv DW_EXPR_EXPRESSION
   or
   .Dv DW_EXPR_VAL_EXPRESSION ,
   the location pointed to by argument
   .Ar offset_or_block_len
   will be set to the length in bytes of the DWARF expression block
   associated with the register rule.
   .Pp
   Argument
   .Ar block_ptr
   should point to a location which will be set to a pointer to the
   content of the DWARF expression block associated with the register
   rule.
   .Pp
   Argument
   .Ar row_pc
   should point to a location which will be set to the lowest program
   counter address associated with the register rule found.
   .Pp
   If argument
   .Ar err
   is not NULL, it will be used to return an error descriptor in case
   of an error.
   .Sh RETURN VALUES
   Function
   .Fn dwarf_get_fde_info_for_reg3
   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_fde_info_for_reg3
   can fail with:
   .Bl -tag -width ".Bq Er DW_DLE_FRAME_TABLE_COL_BAD"
   .It Bq Er DW_DLE_ARGUMENT
   One of the arguments
   .Ar block_ptr ,
   .Ar fde ,
   .Ar offset_or_block_len ,
   .Ar offset_relevant ,
   .Ar register_num ,
   .Ar row_pc ,
   or
   .Ar type
   was NULL.
   .It Bq Er DW_DLE_FRAME_TABLE_COL_BAD
   The column number provided in argument
   .Ar table_column
   was too large.
   .It Bq Er DW_DLE_PC_NOT_IN_FDE_RANGE
   The program counter value provided in argument
   .Ar pc
   did not fall in the range covered by argument
   .Ar fde .
   .El
   .Sh EXAMPLE
   To retrieve the register rules at column 3 from a rule table
   associated with a FDE descriptor:
   .Bd -literal -offset indent
   Dwarf_Fde fde;
   Dwarf_Off fde_offset, cie_offset;
   Dwarf_Unsigned func_len, fde_length;
   Dwarf_Signed cie_index, offset_relevant, register_num;
   Dwarf_Signed offset_or_block_len;
   Dwarf_Addr low_pc, row_pc;
   Dwarf_Ptr fde_addr, block_ptr;
   Dwarf_Small type;
   Dwarf_Error de;
   
   /* ... assuming `fde` references a valid FDE descriptor... */
   if (dwarf_get_fde_range(fde, &low_pc, &func_len, &fde_addr,
       &fde_length, &cie_offset, &cie_index, &fde_offset,
       &de) != DW_DLV_OK)
           errx(EXIT_FAILURE, "dwarf_get_fde_range failed: %s",
               dwarf_errmsg(de));
   
   /* Iterate all the table rows. */
   for (pc = low_pc; pc < low_pc + func_len; pc++) {
           if (dwarf_get_fde_info_for_reg3(fde, 3, pc, &type,
               &offset_relevant, &register_num, &offset_or_block_len,
               &block_ptr, &row_pc, &de) != DW_DLV_OK) {
                   warnx("dwarf_get_fde_info_for_reg3 failed: %s",
                       dwarf_errmsg(de));
                   continue;
           }
           /* ... use the retrieved register rule ... */
   }
   .Ed
   .Sh SEE ALSO
   .Xr dwarf 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_n 3 ,
   .Xr dwarf_set_frame_cfa_value 3 ,
   .Xr dwarf_set_frame_rule_table_size 3 ,
   .Xr dwarf_set_frame_rule_initial_value 3 ,
   .Xr dwarf_set_frame_same_value 3 ,
   .Xr dwarf_set_frame_undefined_value 3
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