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dwarf_get_fde_info_for_cfa_reg3(3) [freebsd man page]

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

Check Out this Related Man Page

DWARF_SET_FRAME_CFA_VALUE(3)				   BSD Library Functions Manual 			      DWARF_SET_FRAME_CFA_VALUE(3)

NAME
dwarf_set_frame_cfa_value, dwarf_set_frame_rule_initial_value, dwarf_set_frame_rule_table_size, dwarf_set_frame_same_value, dwarf_set_frame_undefined_value -- set internal register rule table parameters LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> Dwarf_Half dwarf_set_frame_cfa_value(Dwarf_Debug dbg, Dwarf_Half value); Dwarf_Half dwarf_set_frame_rule_initial_value(Dwarf_Debug dbg, Dwarf_Half value); Dwarf_Half dwarf_set_frame_rule_table_size(Dwarf_Debug dbg, Dwarf_Half value); Dwarf_Half dwarf_set_frame_same_value(Dwarf_Debug dbg, Dwarf_Half value); Dwarf_Half dwarf_set_frame_undefined_value(Dwarf_Debug dbg, Dwarf_Half value); DESCRIPTION
These functions set the parameters of the internal register rule table. Argument dbg should reference a DWARF debug context allocated using dwarf_init(3). Argument value should hold the parameter value to set. Function dwarf_set_frame_cfa_value() sets the column number for the CFA register rule in the internal register rule table. The constant DW_FRAME_CFA_COL is the default CFA register column number for DWARF2-only interfaces, and the constant DW_FRAME_CFA_COL3 is the default CFA column number for DWARF3-compatible interfaces. Function dwarf_set_frame_rule_initial_value() sets the initial value of the register rules in the internal register rule table. The default initial value is the constant DW_FRAME_REG_INITIAL_VALUE, defined in the header file <libdwarf.h>. Function dwarf_set_frame_rule_table_size() sets the maxmium number of columns of the internal register rule table. Argument value should be at least as large as the number of real registers in the ABI. Function dwarf_set_frame_same_value() sets the register number representing the ``same value'' register rule. The default register number for the ``same value'' rule is the constant DW_FRAME_SAME_VAL, defined in the header file <libdwarf.h>. Function dwarf_set_frame_undefined_value() sets the register number representing the ``undefined'' register rule. The default register num- ber for the ``undefined'' rule is the constant DW_FRAME_UNDEFINED_VAL, defined in the header file <libdwarf.h>. RETURN VALUES
These functions return the previous value of the parameter being set. 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_cfa_reg3(3), dwarf_get_fde_info_for_reg(3), dwarf_get_fde_info_for_reg3(3), dwarf_get_fde_n(3) BSD
June 18, 2011 BSD

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