08-27-2012
Hi Elixir
Thanks a bunch for your prompt reply.
We tried this command but its providing the output as '0'.
Also the two files that we mentioned are in different paths.
Could you please help
.
Thanks in Advance
CFA
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LEARN ABOUT FREEBSD
dwarf_get_fde_info_for_cfa_reg3
DWARF_GET_FDE_INFO_FOR_CFA_REGS3(3) BSD Library Functions Manual DWARF_GET_FDE_INFO_FOR_CFA_REGS3(3)
NAME
dwarf_get_fde_info_for_cfa_regs3 -- retrieve a CFA register rule
LIBRARY
DWARF Access Library (libdwarf, -ldwarf)
SYNOPSIS
#include <libdwarf.h>
int
dwarf_get_fde_info_for_cfa_regs3(Dwarf_Fde fde, Dwarf_Addr pc, Dwarf_Small *type, Dwarf_Signed *offset_relevant, Dwarf_Signed *register_num,
Dwarf_Signed *offset_or_block_len, Dwarf_Ptr *block_ptr, Dwarf_Addr *row_pc, Dwarf_Error *err);
DESCRIPTION
Function dwarf_get_fde_info_for_cfa_reg3() retrieves the CFA register rule for a given program counter address from the register rule table
associated with an FDE descriptor.
Argument fde should reference a valid DWARF FDE descriptor.
Argument pc should hold the program counter address to be used to locate the desired register rule row.
On successful execution, dwarf_get_fde_info_for_cfa_reg3() stores information about the CFA register rule found into the locations pointed to
by the arguments type, offset_relevant, register_num, offset_or_block_len, block_ptr and row_pc.
Argument type should point to a location which will hold the type code of the register rule found. The returned value is one of the
DW_EXPR_* contants defined in the header file <libdwarf.h>.
If there is an offset value associated with the CFA register rule, the location pointed to by argument offset_relevant will be set to 1.
Argument register_num should point to a location which will hold the register number associated with the CFA register rule.
If the CFA register rule is of type DW_EXPR_OFFSET or DW_EXPR_VAL_OFFSET, the location pointed to by argument 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
DW_EXPR_EXPRESSION or DW_EXPR_VAL_EXPRESSION, the location pointed to by argument offset_or_block_len will be set to the length in bytes of
the DWARF expression block associated with the register rule.
Argument 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
CFA register rule.
Argument row_pc should point to a location which will be set to the lowest program counter address associated with the register rule found.
If argument err is not NULL, it will be used to return an error descriptor in case of an error.
RETURN VALUES
Function dwarf_get_fde_info_for_cfa_reg3() returns DW_DLV_OK when it succeeds. In case of an error, it returns DW_DLV_ERROR and sets the
argument err.
ERRORS
Function dwarf_get_fde_info_for_cfa_reg3() can fail with:
[DW_DLE_ARGUMENT] One of the arguments block_ptr, fde, offset_or_block_len, offset_relevant, register_num, row_pc, or type was
NULL.
[DW_DLE_PC_NOT_IN_FDE_RANGE] The program counter value provided in argument pc did not fall in the range covered by argument fde.
SEE ALSO
dwarf(3), dwarf_get_fde_at_pc(3), dwarf_get_fde_info_for_all_regs(3), dwarf_get_fde_info_for_all_regs3(3), dwarf_get_fde_info_for_reg(3),
dwarf_get_fde_info_for_reg3(3), dwarf_get_fde_n(3), dwarf_set_frame_cfa_value(3), dwarf_set_frame_rule_table_size(3),
dwarf_set_frame_rule_initial_value(3), dwarf_set_frame_same_value(3), dwarf_set_frame_undefined_value(3)
BSD
June 12, 2011 BSD