quakeforge/tools/qfcc/include/reloc.h

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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>
Date: 2002/06/07
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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
*/
#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
*/
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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
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} reloc_type;
/** Relocation record.
One relocation record is created for each reference that needs to be
updated.
*/
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typedef struct reloc_s {
struct reloc_s *next; ///< next reloc in reloc chain
struct ex_label_s *label; ///< instruction label for *_op relocs
struct defspace_s *space; ///< the space containing the location in
///< need of adjustment for def_* relocations
///< (op_* relocations always use the code
///< space)
int offset; ///< the address of 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
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} reloc_t;
struct statement_s;
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struct def_s;
struct function_s;
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/** 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 space The defspace containting the location to be adjusted.
\param offset The address of the location to be adjusted.
\param type The type of relocation to be performed.
*/
reloc_t *new_reloc (struct defspace_s *space, 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_def (struct def_s *def, struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_def_ofs (struct def_s *def, struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_func (struct function_s *func, struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_string (struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_field (struct def_s *def, struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_field_ofs (struct def_s *def, struct def_s *location);
/** 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 location Def describing the location of the reference to be
adjusted. As the def's space and offset will be copied
into the relocation record, a dummy def may be used.
*/
void reloc_def_op (struct ex_label_s *label, struct def_s *location);
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///@}
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#endif//__reloc_h