forked from Imagelibrary/binutils-gdb
6df01ab8ab
The defs.h header will take care of including the various config.h headers. For now, it's just config.h, but we'll add more when we integrate gnulib in. This header should be used instead of config.h, and should be the first include in every .c file. We won't rely on the old behavior where we expected files to include the port's sim-main.h which then includes the common sim-basics.h which then includes config.h. We have a ton of code that includes things before sim-main.h, and it sometimes needs to be that way. Creating a dedicated header avoids the ordering mess and implicit inclusion that shows up otherwise.
139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/* Run function for the micromips simulator
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Copyright (C) 2005-2021 Free Software Foundation, Inc.
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Contributed by Imagination Technologies, Ltd.
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Written by Andrew Bennett <andrew.bennett@imgtec.com>.
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This file is part of the MIPS sim.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(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. See the
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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, see <http://www.gnu.org/licenses/>. */
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/* This must come before any other includes. */
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#include "defs.h"
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#include "sim-main.h"
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#include "micromips16_idecode.h"
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#include "micromips32_idecode.h"
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#include "micromips_m32_idecode.h"
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#include "bfd.h"
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#include "sim-engine.h"
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/* These definitions come from the *_support.h files generated by igen and are
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required because they are used in some of the macros in the code below.
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Unfortunately we can not just blindly include the *_support.h files to get
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these definitions because some of the defines in these files are specific
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for a particular configuration of the simulator for example instruction word
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size is 16 bits for micromips16 and 32 bits for micromips32. This means we
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could break future code changes by doing this, so a safer approach is to just
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extract the defines that we need to get this file to compile. */
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#define SD sd
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#define CPU cpu
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address_word
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micromips_instruction_decode (SIM_DESC sd, sim_cpu * cpu,
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address_word cia,
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int instruction_size)
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{
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if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_ANY)
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{
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micromips16_instruction_word instruction_0 = IMEM16_MICROMIPS (cia);
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if (MICROMIPS_MINOR_OPCODE (instruction_0) > 0
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&& MICROMIPS_MINOR_OPCODE (instruction_0) < 4)
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return micromips16_idecode_issue (sd, instruction_0, cia);
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else
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{
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micromips32_instruction_word instruction_0 = IMEM32_MICROMIPS (cia);
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return micromips32_idecode_issue (sd, instruction_0, cia);
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}
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}
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else if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_16)
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{
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micromips16_instruction_word instruction_0 = IMEM16_MICROMIPS (cia);
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if (MICROMIPS_MINOR_OPCODE (instruction_0) > 0
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&& MICROMIPS_MINOR_OPCODE (instruction_0) < 4)
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return micromips16_idecode_issue (sd, instruction_0, cia);
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else
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sim_engine_abort (sd, cpu, cia,
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"Invalid 16 bit micromips instruction");
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}
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else if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_32)
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{
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micromips32_instruction_word instruction_0 = IMEM32_MICROMIPS (cia);
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return micromips32_idecode_issue (sd, instruction_0, cia);
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}
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else
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return NULL_CIA;
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}
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void
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sim_engine_run (SIM_DESC sd, int next_cpu_nr, int nr_cpus,
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int signal)
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{
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micromips_m32_instruction_word instruction_0;
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sim_cpu *cpu = STATE_CPU (sd, next_cpu_nr);
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micromips32_instruction_address cia = CPU_PC_GET (cpu);
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sd->isa_mode = ISA_MODE_MIPS32;
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while (1)
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{
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micromips32_instruction_address nia;
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/* Allow us to switch back from MIPS32 to microMIPS
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This covers two cases:
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1. Setting the correct isa mode based on the start address
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from the elf header.
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2. Setting the correct isa mode after a MIPS32 jump or branch
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instruction. */
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if ((sd->isa_mode == ISA_MODE_MIPS32)
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&& ((cia & 0x1) == ISA_MODE_MICROMIPS))
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{
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sd->isa_mode = ISA_MODE_MICROMIPS;
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cia = cia & ~0x1;
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}
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#if defined (ENGINE_ISSUE_PREFIX_HOOK)
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ENGINE_ISSUE_PREFIX_HOOK ();
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#endif
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switch (sd->isa_mode)
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{
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case ISA_MODE_MICROMIPS:
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nia =
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micromips_instruction_decode (sd, cpu, cia,
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MICROMIPS_DELAYSLOT_SIZE_ANY);
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break;
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case ISA_MODE_MIPS32:
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instruction_0 = IMEM32 (cia);
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nia = micromips_m32_idecode_issue (sd, instruction_0, cia);
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break;
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default:
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nia = NULL_CIA;
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}
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#if defined (ENGINE_ISSUE_POSTFIX_HOOK)
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ENGINE_ISSUE_POSTFIX_HOOK ();
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#endif
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/* Update the instruction address */
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cia = nia;
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/* process any events */
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if (sim_events_tick (sd))
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{
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CPU_PC_SET (cpu, cia);
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sim_events_process (sd);
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cia = CPU_PC_GET (cpu);
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}
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}
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}
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