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8e394ffc AB |
1 | /* Run function for the micromips simulator |
2 | ||
618f726f | 3 | Copyright (C) 2005-2016 Free Software Foundation, Inc. |
8e394ffc AB |
4 | Contributed by Imagination Technologies, Ltd. |
5 | Written by Andrew Bennett <andrew.bennett@imgtec.com>. | |
6 | ||
7 | This file is part of the MIPS sim. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 3 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "sim-main.h" | |
23 | #include "micromips16_idecode.h" | |
24 | #include "micromips32_idecode.h" | |
25 | #include "micromips_m32_idecode.h" | |
26 | #include "bfd.h" | |
27 | #include "sim-engine.h" | |
28 | ||
29 | /* These definitions come from the *_support.h files generated by igen and are | |
30 | required because they are used in some of the macros in the code below. | |
31 | Unfortunately we can not just blindly include the *_support.h files to get | |
32 | these definitions because some of the defines in these files are specific | |
33 | for a particular configuration of the simulator for example instruction word | |
34 | size is 16 bits for micromips16 and 32 bits for micromips32. This means we | |
35 | could break future code changes by doing this, so a safer approach is to just | |
36 | extract the defines that we need to get this file to compile. */ | |
37 | #define SD sd | |
38 | #define CPU cpu | |
39 | ||
40 | address_word | |
41 | micromips_instruction_decode (SIM_DESC sd, sim_cpu * cpu, | |
42 | address_word cia, | |
43 | int instruction_size) | |
44 | { | |
45 | if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_ANY) | |
46 | { | |
47 | micromips16_instruction_word instruction_0 = IMEM16_MICROMIPS (cia); | |
48 | if (MICROMIPS_MINOR_OPCODE (instruction_0) > 0 | |
49 | && MICROMIPS_MINOR_OPCODE (instruction_0) < 4) | |
50 | return micromips16_idecode_issue (sd, instruction_0, cia); | |
51 | else | |
52 | { | |
53 | micromips32_instruction_word instruction_0 = IMEM32_MICROMIPS (cia); | |
54 | return micromips32_idecode_issue (sd, instruction_0, cia); | |
55 | } | |
56 | } | |
57 | else if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_16) | |
58 | { | |
59 | micromips16_instruction_word instruction_0 = IMEM16_MICROMIPS (cia); | |
60 | if (MICROMIPS_MINOR_OPCODE (instruction_0) > 0 | |
61 | && MICROMIPS_MINOR_OPCODE (instruction_0) < 4) | |
62 | return micromips16_idecode_issue (sd, instruction_0, cia); | |
63 | else | |
64 | sim_engine_abort (sd, cpu, cia, | |
65 | "Invalid 16 bit micromips instruction"); | |
66 | } | |
67 | else if (instruction_size == MICROMIPS_DELAYSLOT_SIZE_32) | |
68 | { | |
69 | micromips32_instruction_word instruction_0 = IMEM32_MICROMIPS (cia); | |
70 | return micromips32_idecode_issue (sd, instruction_0, cia); | |
71 | } | |
72 | else | |
73 | return NULL_CIA; | |
74 | } | |
75 | ||
76 | void | |
77 | sim_engine_run (SIM_DESC sd, int next_cpu_nr, int nr_cpus, | |
78 | int signal) | |
79 | { | |
80 | micromips_m32_instruction_word instruction_0; | |
81 | sim_cpu *cpu = STATE_CPU (sd, next_cpu_nr); | |
82 | micromips32_instruction_address cia = CPU_PC_GET (cpu); | |
83 | sd->isa_mode = ISA_MODE_MIPS32; | |
84 | ||
85 | while (1) | |
86 | { | |
87 | micromips32_instruction_address nia; | |
88 | ||
89 | /* Allow us to switch back from MIPS32 to microMIPS | |
90 | This covers two cases: | |
91 | 1. Setting the correct isa mode based on the start address | |
92 | from the elf header. | |
93 | 2. Setting the correct isa mode after a MIPS32 jump or branch | |
94 | instruction. */ | |
95 | if ((sd->isa_mode == ISA_MODE_MIPS32) | |
96 | && ((cia & 0x1) == ISA_MODE_MICROMIPS)) | |
97 | { | |
98 | sd->isa_mode = ISA_MODE_MICROMIPS; | |
99 | cia = cia & ~0x1; | |
100 | } | |
101 | ||
102 | #if defined (ENGINE_ISSUE_PREFIX_HOOK) | |
103 | ENGINE_ISSUE_PREFIX_HOOK (); | |
104 | #endif | |
105 | switch (sd->isa_mode) | |
106 | { | |
107 | case ISA_MODE_MICROMIPS: | |
108 | nia = | |
109 | micromips_instruction_decode (sd, cpu, cia, | |
110 | MICROMIPS_DELAYSLOT_SIZE_ANY); | |
111 | break; | |
112 | case ISA_MODE_MIPS32: | |
113 | instruction_0 = IMEM32 (cia); | |
114 | nia = micromips_m32_idecode_issue (sd, instruction_0, cia); | |
115 | break; | |
116 | default: | |
117 | nia = NULL_CIA; | |
118 | } | |
119 | ||
120 | #if defined (ENGINE_ISSUE_POSTFIX_HOOK) | |
121 | ENGINE_ISSUE_POSTFIX_HOOK (); | |
122 | #endif | |
123 | ||
124 | /* Update the instruction address */ | |
125 | cia = nia; | |
126 | ||
127 | /* process any events */ | |
128 | if (sim_events_tick (sd)) | |
129 | { | |
130 | CPU_PC_SET (cpu, cia); | |
131 | sim_events_process (sd); | |
132 | cia = CPU_PC_GET (cpu); | |
133 | } | |
134 | } | |
135 | } |