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Isuru Samarathunga
2025-10-16 00:43:42 +05:30
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/**
* \file libyasm/arch.h
* \brief YASM architecture interface.
*
* \license
* Copyright (C) 2002-2007 Peter Johnson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND OTHER CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR OTHER CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* \endlicense
*/
#ifndef YASM_ARCH_H
#define YASM_ARCH_H
/** Errors that may be returned by yasm_arch_module::create(). */
typedef enum yasm_arch_create_error {
YASM_ARCH_CREATE_OK = 0, /**< No error. */
YASM_ARCH_CREATE_BAD_MACHINE, /**< Unrecognized machine name. */
YASM_ARCH_CREATE_BAD_PARSER /**< Unrecognized parser name. */
} yasm_arch_create_error;
/** Return values for yasm_arch_module::parse_check_insnprefix(). */
typedef enum yasm_arch_insnprefix {
YASM_ARCH_NOTINSNPREFIX = 0, /**< Unrecognized */
YASM_ARCH_INSN, /**< An instruction */
YASM_ARCH_PREFIX /**< An instruction prefix */
} yasm_arch_insnprefix;
/** Types of registers / target modifiers that may be returned by
* yasm_arch_module::parse_check_regtmod().
*/
typedef enum yasm_arch_regtmod {
YASM_ARCH_NOTREGTMOD = 0, /**< Unrecognized */
YASM_ARCH_REG, /**< A "normal" register */
YASM_ARCH_REGGROUP, /**< A group of indexable registers */
YASM_ARCH_SEGREG, /**< A segment register */
YASM_ARCH_TARGETMOD /**< A target modifier (for jumps) */
} yasm_arch_regtmod;
#ifndef YASM_DOXYGEN
/** Base #yasm_arch structure. Must be present as the first element in any
* #yasm_arch implementation.
*/
typedef struct yasm_arch_base {
/** #yasm_arch_module implementation for this architecture. */
const struct yasm_arch_module *module;
} yasm_arch_base;
#endif
/** YASM machine subtype. A number of different machine types may be
* associated with a single architecture. These may be specific CPU's, but
* the ABI used to interface with the architecture should be the primary
* differentiator between machines. Some object formats (ELF) use the machine
* to determine parameters within the generated output.
*/
typedef struct yasm_arch_machine {
/** One-line description of the machine. */
const char *name;
/** Keyword used to select machine. */
const char *keyword;
} yasm_arch_machine;
/** YASM architecture module interface.
* \note All "data" in parser-related functions (yasm_arch_parse_*) needs to
* start the parse initialized to 0 to make it okay for a parser-related
* function to use/check previously stored data to see if it's been
* called before on the same piece of data.
*/
typedef struct yasm_arch_module {
/** One-line description of the architecture.
* Call yasm_arch_name() to get the name of a particular #yasm_arch.
*/
const char *name;
/** Keyword used to select architecture.
* Call yasm_arch_keyword() to get the keyword of a particular #yasm_arch.
*/
const char *keyword;
/** NULL-terminated list of directives. NULL if none. */
/*@null@*/ const yasm_directive *directives;
/** Create architecture.
* Module-level implementation of yasm_arch_create().
* Call yasm_arch_create() instead of calling this function.
*/
/*@only@*/ yasm_arch * (*create) (const char *machine, const char *parser,
/*@out@*/ yasm_arch_create_error *error);
/** Module-level implementation of yasm_arch_destroy().
* Call yasm_arch_destroy() instead of calling this function.
*/
void (*destroy) (/*@only@*/ yasm_arch *arch);
/** Module-level implementation of yasm_arch_get_machine().
* Call yasm_arch_get_machine() instead of calling this function.
*/
const char * (*get_machine) (const yasm_arch *arch);
/** Module-level implementation of yasm_arch_get_address_size().
* Call yasm_arch_get_address_size() instead of calling this function.
*/
unsigned int (*get_address_size) (const yasm_arch *arch);
/** Module-level implementation of yasm_arch_set_var().
* Call yasm_arch_set_var() instead of calling this function.
*/
int (*set_var) (yasm_arch *arch, const char *var, unsigned long val);
/** Module-level implementation of yasm_arch_parse_check_insnprefix().
* Call yasm_arch_parse_check_insnprefix() instead of calling this function.
*/
yasm_arch_insnprefix (*parse_check_insnprefix)
(yasm_arch *arch, const char *id, size_t id_len, unsigned long line,
/*@out@*/ /*@only@*/ yasm_bytecode **bc, /*@out@*/ uintptr_t *prefix);
/** Module-level implementation of yasm_arch_parse_check_regtmod().
* Call yasm_arch_parse_check_regtmod() instead of calling this function.
*/
yasm_arch_regtmod (*parse_check_regtmod)
(yasm_arch *arch, const char *id, size_t id_len,
/*@out@*/ uintptr_t *data);
/** Module-level implementation of yasm_arch_get_fill().
* Call yasm_arch_get_fill() instead of calling this function.
*/
const unsigned char ** (*get_fill) (const yasm_arch *arch);
/** Module-level implementation of yasm_arch_floatnum_tobytes().
* Call yasm_arch_floatnum_tobytes() instead of calling this function.
*/
int (*floatnum_tobytes) (yasm_arch *arch, const yasm_floatnum *flt,
unsigned char *buf, size_t destsize,
size_t valsize, size_t shift, int warn);
/** Module-level implementation of yasm_arch_intnum_tobytes().
* Call yasm_arch_intnum_tobytes() instead of calling this function.
*/
int (*intnum_tobytes) (yasm_arch *arch, const yasm_intnum *intn,
unsigned char *buf, size_t destsize, size_t valsize,
int shift, const yasm_bytecode *bc,
int warn);
/** Module-level implementation of yasm_arch_get_reg_size().
* Call yasm_arch_get_reg_size() instead of calling this function.
*/
unsigned int (*get_reg_size) (yasm_arch *arch, uintptr_t reg);
/** Module-level implementation of yasm_arch_reggroup_get_reg().
* Call yasm_arch_reggroup_get_reg() instead of calling this function.
*/
uintptr_t (*reggroup_get_reg) (yasm_arch *arch, uintptr_t reggroup,
unsigned long regindex);
/** Module-level implementation of yasm_arch_reg_print().
* Call yasm_arch_reg_print() instead of calling this function.
*/
void (*reg_print) (yasm_arch *arch, uintptr_t reg, FILE *f);
/** Module-level implementation of yasm_arch_segreg_print().
* Call yasm_arch_segreg_print() instead of calling this function.
*/
void (*segreg_print) (yasm_arch *arch, uintptr_t segreg, FILE *f);
/** Module-level implementation of yasm_arch_ea_create().
* Call yasm_arch_ea_create() instead of calling this function.
*/
yasm_effaddr * (*ea_create) (yasm_arch *arch, /*@keep@*/ yasm_expr *e);
/** Module-level implementation of yasm_arch_ea_destroy().
* Call yasm_arch_ea_destroy() instead of calling this function.
*/
void (*ea_destroy) (/*@only@*/ yasm_effaddr *ea);
/** Module-level implementation of yasm_arch_ea_print().
* Call yasm_arch_ea_print() instead of calling this function.
*/
void (*ea_print) (const yasm_effaddr *ea, FILE *f, int indent_level);
/** Module-level implementation of yasm_arch_create_empty_insn().
* Call yasm_arch_create_empty_insn() instead of calling this function.
*/
/*@only@*/ yasm_bytecode * (*create_empty_insn) (yasm_arch *arch,
unsigned long line);
/** NULL-terminated list of machines for this architecture.
* Call yasm_arch_get_machine() to get the active machine of a particular
* #yasm_arch.
*/
const yasm_arch_machine *machines;
/** Default machine keyword.
* Call yasm_arch_get_machine() to get the active machine of a particular
* #yasm_arch.
*/
const char *default_machine_keyword;
/** Canonical "word" size in bits.
* Call yasm_arch_wordsize() to get the word size of a particular
* #yasm_arch.
*/
unsigned int wordsize;
/** Worst case minimum instruction length in bytes.
* Call yasm_arch_min_insn_len() to get the minimum instruction length of
* a particular #yasm_arch.
*/
unsigned int min_insn_len;
} yasm_arch_module;
/** Get the one-line description of an architecture.
* \param arch architecture
* \return One-line description of architecture.
*/
const char *yasm_arch_name(const yasm_arch *arch);
/** Get the keyword used to select an architecture.
* \param arch architecture
* \return Architecture keyword.
*/
const char *yasm_arch_keyword(const yasm_arch *arch);
/** Get the word size of an architecture.
* \param arch architecture
* \return Word size (in bits).
*/
unsigned int yasm_arch_wordsize(const yasm_arch *arch);
/** Get the minimum instruction length of an architecture.
* \param arch architecture
* \return Minimum instruction length (in bytes).
*/
unsigned int yasm_arch_min_insn_len(const yasm_arch *arch);
/** Create architecture.
* \param module architecture module
* \param machine keyword of machine in use (must be one listed in
* #yasm_arch_module.machines)
* \param parser keyword of parser in use
* \param error error return value
* \return NULL on error (error returned in error parameter), otherwise new
* architecture.
*/
/*@only@*/ yasm_arch *yasm_arch_create(const yasm_arch_module *module,
const char *machine, const char *parser,
/*@out@*/ yasm_arch_create_error *error);
/** Clean up, free any architecture-allocated memory.
* \param arch architecture
*/
void yasm_arch_destroy(/*@only@*/ yasm_arch *arch);
/** Get architecture's active machine name.
* \param arch architecture
* \return Active machine name.
*/
const char *yasm_arch_get_machine(const yasm_arch *arch);
/** Get architecture's active address size, in bits.
* \param arch architecture
* \return Active address size (in bits).
*/
unsigned int yasm_arch_get_address_size(const yasm_arch *arch);
/** Set any arch-specific variables. For example, "mode_bits" in x86.
* \param arch architecture
* \param var variable name
* \param val value to set
* \return Zero on success, non-zero on failure (variable does not exist).
*/
int yasm_arch_set_var(yasm_arch *arch, const char *var, unsigned long val);
/** Check an generic identifier to see if it matches architecture specific
* names for instructions or instruction prefixes. Unrecognized identifiers
* should return #YASM_ARCH_NOTINSNPREFIX so they can be treated as normal
* symbols. Any additional data beyond just the type (almost always necessary)
* should be returned into the space provided by the data parameter.
* \param arch architecture
* \param id identifier as in the input file
* \param id_len length of id string
* \param line virtual line
* \param bc for instructions, yasm_insn-based bytecode is returned
* (and NULL otherwise)
* \param prefix for prefixes, yasm_arch-specific value is returned
* (and 0 otherwise)
* \return Identifier type (#YASM_ARCH_NOTINSNPREFIX if unrecognized)
*/
yasm_arch_insnprefix yasm_arch_parse_check_insnprefix
(yasm_arch *arch, const char *id, size_t id_len, unsigned long line,
/*@out@*/ /*@only@*/ yasm_bytecode **bc, /*@out@*/ uintptr_t *prefix);
/** Check an generic identifier to see if it matches architecture specific
* names for registers or target modifiers. Unrecognized identifiers should
* return #YASM_ARCH_NOTREGTMOD. Any additional data beyond just the type
* (almost always necessary) should be returned into the space provided by the
* data parameter.
* \param arch architecture
* \param id identifier as in the input file
* \param id_len length of id string
* \param data extra identification information (yasm_arch-specific)
* [output]
* \return Identifier type (#YASM_ARCH_NOTREGTMOD if unrecognized)
*/
yasm_arch_regtmod yasm_arch_parse_check_regtmod
(yasm_arch *arch, const char *id, size_t id_len,
/*@out@*/ uintptr_t *data);
/** Get NOP fill patterns for 1-15 bytes of fill.
* \param arch architecture
* \return 16-entry array of arrays; [0] is unused, [1] - [15] point to arrays
* of 1-15 bytes (respectively) in length.
*/
const unsigned char **yasm_arch_get_fill(const yasm_arch *arch);
/** Output #yasm_floatnum to buffer. Puts the value into the least
* significant bits of the destination, or may be shifted into more
* significant bits by the shift parameter. The destination bits are
* cleared before being set.
* Architecture-specific because of endianness.
* \param arch architecture
* \param flt floating point value
* \param buf buffer to write into
* \param destsize destination size (in bytes)
* \param valsize size (in bits)
* \param shift left shift (in bits)
* \param warn enables standard overflow/underflow warnings
* \return Nonzero on error.
*/
int yasm_arch_floatnum_tobytes(yasm_arch *arch, const yasm_floatnum *flt,
unsigned char *buf, size_t destsize,
size_t valsize, size_t shift, int warn);
/** Output #yasm_intnum to buffer. Puts the value into the least
* significant bits of the destination, or may be shifted into more
* significant bits by the shift parameter. The destination bits are
* cleared before being set.
* \param arch architecture
* \param intn integer value
* \param buf buffer to write into
* \param destsize destination size (in bytes)
* \param valsize size (in bits)
* \param shift left shift (in bits); may be negative to specify right
* shift (standard warnings include truncation to boundary)
* \param bc bytecode being output ("parent" of value)
* \param warn enables standard warnings (value doesn't fit into
* valsize bits)
* \return Nonzero on error.
*/
int yasm_arch_intnum_tobytes(yasm_arch *arch, const yasm_intnum *intn,
unsigned char *buf, size_t destsize,
size_t valsize, int shift,
const yasm_bytecode *bc, int warn);
/** Get the equivalent size of a register in bits.
* \param arch architecture
* \param reg register
* \return 0 if there is no suitable equivalent size, otherwise the size.
*/
unsigned int yasm_arch_get_reg_size(yasm_arch *arch, uintptr_t reg);
/** Get a specific register of a register group, based on the register
* group and the index within the group.
* \param arch architecture
* \param reggroup register group
* \param regindex register index
* \return 0 if regindex is not valid for that register group, otherwise the
* specific register value.
*/
uintptr_t yasm_arch_reggroup_get_reg(yasm_arch *arch, uintptr_t reggroup,
unsigned long regindex);
/** Print a register. For debugging purposes.
* \param arch architecture
* \param reg register
* \param f file
*/
void yasm_arch_reg_print(yasm_arch *arch, uintptr_t reg, FILE *f);
/** Print a segment register. For debugging purposes.
* \param arch architecture
* \param segreg segment register
* \param f file
*/
void yasm_arch_segreg_print(yasm_arch *arch, uintptr_t segreg, FILE *f);
/** Create an effective address from an expression.
* \param arch architecture
* \param e expression (kept, do not delete)
* \return Newly allocated effective address.
*/
yasm_effaddr *yasm_arch_ea_create(yasm_arch *arch, /*@keep@*/ yasm_expr *e);
/** Delete (free allocated memory for) an effective address.
* \param arch architecture
* \param ea effective address (only pointer to it).
*/
void yasm_arch_ea_destroy(yasm_arch *arch, /*@only@*/ yasm_effaddr *ea);
/** Print an effective address. For debugging purposes.
* \param arch architecture
* \param ea effective address
* \param f file
* \param indent_level indentation level
*/
void yasm_arch_ea_print(const yasm_arch *arch, const yasm_effaddr *ea,
FILE *f, int indent_level);
/** Create a bytecode that represents a single empty (0 length) instruction.
* This is used for handling solitary prefixes.
* \param arch architecture
* \param line virtual line (from yasm_linemap)
* \return Newly allocated bytecode.
*/
/*@only@*/ yasm_bytecode *yasm_arch_create_empty_insn(yasm_arch *arch,
unsigned long line);
#ifndef YASM_DOXYGEN
/* Inline macro implementations for arch functions */
#define yasm_arch_name(arch) \
(((yasm_arch_base *)arch)->module->name)
#define yasm_arch_keyword(arch) \
(((yasm_arch_base *)arch)->module->keyword)
#define yasm_arch_wordsize(arch) \
(((yasm_arch_base *)arch)->module->wordsize)
#define yasm_arch_min_insn_len(arch) \
(((yasm_arch_base *)arch)->module->min_insn_len)
#define yasm_arch_create(module, machine, parser, error) \
module->create(machine, parser, error)
#define yasm_arch_destroy(arch) \
((yasm_arch_base *)arch)->module->destroy(arch)
#define yasm_arch_get_machine(arch) \
((yasm_arch_base *)arch)->module->get_machine(arch)
#define yasm_arch_get_address_size(arch) \
((yasm_arch_base *)arch)->module->get_address_size(arch)
#define yasm_arch_set_var(arch, var, val) \
((yasm_arch_base *)arch)->module->set_var(arch, var, val)
#define yasm_arch_parse_check_insnprefix(arch, id, id_len, line, bc, prefix) \
((yasm_arch_base *)arch)->module->parse_check_insnprefix \
(arch, id, id_len, line, bc, prefix)
#define yasm_arch_parse_check_regtmod(arch, id, id_len, data) \
((yasm_arch_base *)arch)->module->parse_check_regtmod \
(arch, id, id_len, data)
#define yasm_arch_get_fill(arch) \
((yasm_arch_base *)arch)->module->get_fill(arch)
#define yasm_arch_floatnum_tobytes(arch, flt, buf, destsize, valsize, shift, \
warn) \
((yasm_arch_base *)arch)->module->floatnum_tobytes \
(arch, flt, buf, destsize, valsize, shift, warn)
#define yasm_arch_intnum_tobytes(arch, intn, buf, destsize, valsize, shift, \
bc, warn) \
((yasm_arch_base *)arch)->module->intnum_tobytes \
(arch, intn, buf, destsize, valsize, shift, bc, warn)
#define yasm_arch_get_reg_size(arch, reg) \
((yasm_arch_base *)arch)->module->get_reg_size(arch, reg)
#define yasm_arch_reggroup_get_reg(arch, regg, regi) \
((yasm_arch_base *)arch)->module->reggroup_get_reg(arch, regg, regi)
#define yasm_arch_reg_print(arch, reg, f) \
((yasm_arch_base *)arch)->module->reg_print(arch, reg, f)
#define yasm_arch_segreg_print(arch, segreg, f) \
((yasm_arch_base *)arch)->module->segreg_print(arch, segreg, f)
#define yasm_arch_ea_create(arch, e) \
((yasm_arch_base *)arch)->module->ea_create(arch, e)
#define yasm_arch_ea_destroy(arch, ea) \
((yasm_arch_base *)arch)->module->ea_destroy(ea)
#define yasm_arch_ea_print(arch, ea, f, i) \
((yasm_arch_base *)arch)->module->ea_print(ea, f, i)
#define yasm_arch_create_empty_insn(arch, line) \
((yasm_arch_base *)arch)->module->create_empty_insn(arch, line)
#endif
#endif