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