/* reloc.h relocation support Copyright (C) 2002 Bill Currie Author: Bill Currie Date: 2002/06/07 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA $Id$ */ #ifndef __reloc_h #define __reloc_h /** \defgroup qfcc_reloc Relocation handling \ingroup qfcc */ ///@{ /** Relocation record types. Types marked with * are relative and fixed up before the qfo is written. Types marked with ! are handled by only the linker. Types marked with + use pr.relocs */ typedef enum { rel_none, ///< no relocation rel_op_a_def, ///< code[ref.offset].a = def offset rel_op_b_def, ///< code[ref.offset].b = def offset rel_op_c_def, ///< code[ref.offset].c = def offset rel_op_a_op, ///< * code[ref.offset].a = code offset - ref.offset rel_op_b_op, ///< * code[ref.offset].b = code offset - ref.offset rel_op_c_op, ///< * code[ref.offset].c = code offset - ref.offset rel_def_op, ///< + data[ref.offset] = code offset rel_def_def, ///< data[ref.offset] = def offset rel_def_func, ///< +(sometimes) data[ref.offset] = offset rel_def_string, ///< + ! data[ref.offset] = string index rel_def_field, ///< ! data[ref.offset] = field def offset rel_op_a_def_ofs, ///< code[ref.offset].a += def offset rel_op_b_def_ofs, ///< code[ref.offset].b += def offset rel_op_c_def_ofs, ///< code[ref.offset].c += def offset rel_def_def_ofs, ///< data[ref.offset] += def offset rel_def_field_ofs, ///< data[ref.offset] += field def offset } reloc_type; /** Relocation record. One relocation record is created for each reference that needs to be updated. */ typedef struct reloc_s { struct reloc_s *next; ///< next reloc in reloc chain struct ex_label_s *label; ///< instruction label for *_op relocs int offset; ///< the addressof the location in need of ///< adjustment reloc_type type; ///< type type of relocation to perform int line; ///< current source line when creating reloc string_t file; ///< current source file when creating reloc void *return_address; ///< for debugging } reloc_t; struct statement_s; struct def_s; struct function_s; /** Perform all relocations in a relocation chain. \param refs The head of the relocation chain. \param offset The value to be used in the relocations. This will either replace or be added to the value in the relocation target. */ void relocate_refs (reloc_t *refs, int offset); /** Create a relocation record of the specified type. The current source file and line will be preserved in the relocation record. \param offset The address of the instruction that will be adjusted. \param type The type of relocation to be performed. */ reloc_t *new_reloc (int offset, reloc_type type); /** Create a relocation record for an instruction referencing a def. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will replace the value stored in the instruction's operand field. \param def The def being referenced. \param offset The address of the instruction that will be adjusted. \param field The instruction field to be adjusted: 0 = opa, 1 = opb, 2 = opc. */ void reloc_op_def (struct def_s *def, int offset, int field); /** Create a relative relocation record for an instruction referencing a def. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will be added to the value stored in the instruction's operand field. \param def The def being referenced. \param offset The address of the instruction that will be adjusted. \param field The instruction field to be adjusted: 0 = opa, 1 = opb, 2 = opc. */ void reloc_op_def_ofs (struct def_s *def, int offset, int field); /** Create a relocation record for a data location referencing a def. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will replace the value stored in the data location. \param def The def being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_def (struct def_s *def, int offset); /** Create a relocation record for a data location referencing a def. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will be added to the value stored in the data location. \param def The def being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_def_ofs (struct def_s *def, int offset); /** Create a relocation record for a data location referencing a function. The relocation record will be linked into the function's chain of relocation records. When the relocation is performed, the function number will replace the value stored in the data location. \param func The function being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_func (struct function_s *func, int offset); /** Create a relocation record for a data location referencing a string. The relocation record will be linked into the global chain of relocation records. When the relocation is performed, the string index will replace the value stored in the data location. \param offset The address of the data location that will be adjusted. */ void reloc_def_string (int offset); /** Create a relocation record for a data location referencing a field. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will replace the value stored in the data location. \param def The def representing the field being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_field (struct def_s *def, int offset); /** Create a relocation record for a data location referencing a field. The relocation record will be linked into the def's chain of relocation records. When the relocation is performed, the target address will be added to the value stored in the data location. \param def The def representing the field being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_field_ofs (struct def_s *def, int offset); /** Create a relocation record for a data location referencing an instruction. The relocation record will be linked into the global chain of relocation records. When the relocation is performed, the string index will replace the value stored in the data location. \param label The label representing the instruction being referenced. \param offset The address of the data location that will be adjusted. */ void reloc_def_op (struct ex_label_s *label, int offset); ///@} #endif//__reloc_h