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dwarf_get_fde_info_for_all_regs(3) [freebsd man page]

DWARF_GET_FDE_INFO_FOR_ALL_REGS(3)			   BSD Library Functions Manual 			DWARF_GET_FDE_INFO_FOR_ALL_REGS(3)

NAME
dwarf_get_fde_info_for_all_regs -- retrieve register rule row LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_get_fde_info_for_all_regs(Dwarf_Fde fde, Dwarf_Addr pc, Dwarf_Regtable *reg_table, Dwarf_Addr *row_pc, Dwarf_Error *err); DESCRIPTION
Function dwarf_get_fde_info_for_all_regs() retrieves a row from the register rule table associated with the given 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 table row. Argument reg_table should point to a Dwarf_Regtable descriptor which will hold the returned table row of register rules. Argument row_pc should point to a location which will be set to the lowest program counter address associated with the table row. If argument err is not NULL, it will be used to store error information in case of an error. The Dwarf_Regtable descriptor is defined in the header file <libdwarf.h>: typedef struct { struct { Dwarf_Small dw_offset_relevant; Dwarf_Half dw_regnum; Dwarf_Addr dw_offset; } rules[DW_REG_TABLE_SIZE]; } Dwarf_Regtable; For each of the register rules returned, the dw_offset_relevant field is set to 1 if the register rule has a offset value. The dw_regnum field is set to the register number associated with the regsiter rule. The dw_offset field is set to the offset value associated with the register rule. The number of register columns returned is either the constant value DW_REG_TABLE_SIZE as defined in the header file <libdwarf.h>, or the value set by function dwarf_set_frame_rule_table_size(3), whichever is smaller. COMPATIBILITY Function dwarf_get_fde_info_for_all_regs() is deprecated since it only supports DWARF2 frame sections. Applications should instead use func- tion dwarf_get_fde_info_for_all_regs3(3) which supports both DWARF2 and DWARF3 frame sections. RETURN VALUES
Function dwarf_get_fde_info_for_all_regs() 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_all_regs() can fail with: [DW_DLE_ARGUMENT] One of the arguments fde, reg_table or row_pc 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_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), 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 4, 2011 BSD

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DWARF_GET_FDE_INFO_FOR_REG3(3)				   BSD Library Functions Manual 			    DWARF_GET_FDE_INFO_FOR_REG3(3)

NAME
dwarf_get_fde_info_for_reg3 -- retrieve register rule LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_get_fde_info_for_reg3(Dwarf_Fde fde, Dwarf_Half table_column, 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 *error); DESCRIPTION
Function 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. Argument fde should reference a valid DWARF FDE descriptor. Arugment table_column should hold the column number of the register rule desired. 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_reg3() stores information about the 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 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 register rule. If the 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 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_reg3() returns DW_DLV_OK when it succeeds. In case of an error, it returns DW_DLV_ERROR and sets the argu- ment err. ERRORS
Function dwarf_get_fde_info_for_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_FRAME_TABLE_COL_BAD] The column number provided in argument table_column was too large. [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. EXAMPLE
To retrieve the register rules at column 3 from a rule table associated with a FDE descriptor: 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 ... */ } 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_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
November 9, 2011 BSD

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