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/* The IGEN simulator generator for GDB, the GNU Debugger.
Copyright 2002-2021 Free Software Foundation, Inc.
Contributed by Andrew Cagney.
This file is part of GDB.
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 3 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, see <http://www.gnu.org/licenses/>. */
/* code-generation options: */
typedef enum
{
/* Transfer control to an instructions semantic code using the the
standard call/return mechanism */
generate_calls,
/* Transfer control to an instructions semantic code using
(computed) goto's instead of the more conventional call/return
mechanism */
generate_jumps,
}
igen_code;
typedef enum
{
nia_is_cia_plus_one,
nia_is_void,
nia_is_invalid,
}
igen_nia;
typedef struct _igen_gen_options igen_gen_options;
struct _igen_gen_options
{
int direct_access;
int semantic_icache;
int insn_in_icache;
int conditional_issue;
int slot_verification;
int delayed_branch;
/* If zeroing a register, which one? */
int zero_reg;
int zero_reg_nr;
/* should multiple simulators be generated? */
int multi_sim;
/* name of the default multi-sim model */
char *default_model;
/* should the simulator support multi word instructions and if so,
what is the max nr of words. */
int multi_word;
/* SMP? Should the generated code include SMP support (>0) and if
so, for how many processors? */
int smp;
/* how should the next instruction address be computed? */
igen_nia nia;
/* nr of instructions in the decoded instruction cache */
int icache;
int icache_size;
/* see above */
igen_code code;
};
typedef struct _igen_trace_options igen_trace_options;
struct _igen_trace_options
{
int rule_selection;
int rule_rejection;
int insn_insertion;
int insn_expansion;
int entries;
int combine;
};
typedef struct _igen_name
{
char *u;
char *l;
}
igen_name;
typedef struct _igen_module
{
igen_name prefix;
igen_name suffix;
}
igen_module;
typedef struct _igen_module_options
{
igen_module global;
igen_module engine;
igen_module icache;
igen_module idecode;
igen_module itable;
igen_module semantics;
igen_module support;
}
igen_module_options;
typedef struct _igen_decode_options igen_decode_options;
struct _igen_decode_options
{
/* Combine tables? Should the generator make a second pass through
each generated table looking for any sub-entries that contain the
same instructions. Those entries being merged into a single
table */
int combine;
/* Instruction expansion? Should the semantic code for each
instruction, when the oportunity arrises, be expanded according
to the variable opcode files that the instruction decode process
renders constant */
int duplicate;
/* Treat reserved fields as constant (zero) instead of ignoring
their value when determining decode tables */
int zero_reserved;
/* Convert any padded switch rules into goto_switch */
int switch_as_goto;
/* Force all tables to be generated with this lookup mechanism */
char *overriding_gen;
};
typedef struct _igen_warn_options igen_warn_options;
struct _igen_warn_options
{
/* Issue warning about discarded instructions */
int discard;
/* Issue warning about invalid instruction widths */
int width;
/* Issue warning about unimplemented instructions */
int unimplemented;
};
typedef struct _igen_options igen_options;
struct _igen_options
{
/* What does the instruction look like - bit ordering, size, widths or
offesets */
int hi_bit_nr;
int insn_bit_size;
int insn_specifying_widths;
/* what should global names be prefixed with? */
igen_module_options module;
/* See above for options and flags */
igen_gen_options gen;
/* See above for trace options */
igen_trace_options trace;
/* See above for include options */
table_include *include;
/* See above for decode options */
igen_decode_options decode;
/* Filter set to be used on the flag field of the instruction table */
filter *flags_filter;
/* See above for warn options */
igen_warn_options warn;
/* Be more picky about the input */
error_func (*warning);
/* Model (processor) set - like flags_filter. Used to select the
specific ISA within a processor family. */
filter *model_filter;
/* Format name set */
filter *format_name_filter;
};
extern igen_options options;
/* default options - hopefully backward compatible */
#define INIT_OPTIONS() \
do { \
memset (&options, 0, sizeof options); \
memset (&options.warn, -1, sizeof (options.warn)); \
options.hi_bit_nr = 0; \
options.insn_bit_size = default_insn_bit_size; \
options.insn_specifying_widths = 0; \
options.module.global.prefix.u = ""; \
options.module.global.prefix.l = ""; \
/* the prefixes */ \
options.module.engine = options.module.global; \
options.module.icache = options.module.global; \
options.module.idecode = options.module.global; \
options.module.itable = options.module.global; \
options.module.semantics = options.module.global; \
options.module.support = options.module.global; \
/* the suffixes */ \
options.module.engine.suffix.l = "engine"; \
options.module.engine.suffix.u = "ENGINE"; \
options.module.icache.suffix.l = "icache"; \
options.module.icache.suffix.u = "ICACHE"; \
options.module.idecode.suffix.l = "idecode"; \
options.module.idecode.suffix.u = "IDECODE"; \
options.module.itable.suffix.l = "itable"; \
options.module.itable.suffix.u = "ITABLE"; \
options.module.semantics.suffix.l = "semantics"; \
options.module.semantics.suffix.u = "SEMANTICS"; \
options.module.support.suffix.l = "support"; \
options.module.support.suffix.u = "SUPPORT"; \
/* misc stuff */ \
options.gen.code = generate_calls; \
options.gen.icache_size = 1024; \
options.warning = warning; \
} while (0)
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