isa.hh revision 7350 
1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2009 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Gabe Black
41 */
42
43#ifndef __ARCH_ARM_ISA_HH__
44#define __ARCH_MRM_ISA_HH__
45
46#include "arch/arm/registers.hh"
47#include "arch/arm/types.hh"
48
49class ThreadContext;
50class Checkpoint;
51class EventManager;
52
53namespace ArmISA
54{
55    class ISA
56    {
57      protected:
58        MiscReg miscRegs[NumMiscRegs];
59        const IntRegIndex *intRegMap;
60
61        void
62        updateRegMap(CPSR cpsr)
63        {
64            switch (cpsr.mode) {
65              case MODE_USER:
66              case MODE_SYSTEM:
67                intRegMap = IntRegUsrMap;
68                break;
69              case MODE_FIQ:
70                intRegMap = IntRegFiqMap;
71                break;
72              case MODE_IRQ:
73                intRegMap = IntRegIrqMap;
74                break;
75              case MODE_SVC:
76                intRegMap = IntRegSvcMap;
77                break;
78              case MODE_MON:
79                intRegMap = IntRegMonMap;
80                break;
81              case MODE_ABORT:
82                intRegMap = IntRegAbtMap;
83                break;
84              case MODE_UNDEFINED:
85                intRegMap = IntRegUndMap;
86                break;
87              default:
88                panic("Unrecognized mode setting in CPSR.\n");
89            }
90        }
91
92      public:
93        void clear()
94        {
95            memset(miscRegs, 0, sizeof(miscRegs));
96            CPSR cpsr = 0;
97            cpsr.mode = MODE_USER;
98            miscRegs[MISCREG_CPSR] = cpsr;
99            updateRegMap(cpsr);
100
101            SCTLR sctlr = 0;
102            sctlr.nmfi = 1;
103            sctlr.rao1 = 1;
104            sctlr.rao2 = 1;
105            sctlr.rao3 = 1;
106            sctlr.rao4 = 1;
107            miscRegs[MISCREG_SCTLR] = sctlr;
108
109            /*
110             * Technically this should be 0, but we don't support those
111             * settings.
112             */
113            CPACR cpacr = 0;
114            // Enable CP 10, 11
115            cpacr.cp10 = 0x3;
116            cpacr.cp11 = 0x3;
117            miscRegs[MISCREG_CPACR] = cpacr;
118
119            /* One region, unified map. */
120            miscRegs[MISCREG_MPUIR] = 0x100;
121
122            /* Start with an event in the mailbox */
123            miscRegs[MISCREG_SEV_MAILBOX] = 1;
124
125            /*
126             * Implemented = '5' from "M5",
127             * Variant = 0,
128             */
129            miscRegs[MISCREG_MIDR] =
130                (0x35 << 24) | //Implementor is '5' from "M5"
131                (0 << 20)    | //Variant
132                (0xf << 16)  | //Architecture from CPUID scheme
133                (0 << 4)     | //Primary part number
134                (0 << 0)     | //Revision
135                0;
136
137            //XXX We need to initialize the rest of the state.
138        }
139
140        MiscReg
141        readMiscRegNoEffect(int misc_reg)
142        {
143            assert(misc_reg < NumMiscRegs);
144            if (misc_reg == MISCREG_SPSR) {
145                CPSR cpsr = miscRegs[MISCREG_CPSR];
146                switch (cpsr.mode) {
147                  case MODE_USER:
148                    return miscRegs[MISCREG_SPSR];
149                  case MODE_FIQ:
150                    return miscRegs[MISCREG_SPSR_FIQ];
151                  case MODE_IRQ:
152                    return miscRegs[MISCREG_SPSR_IRQ];
153                  case MODE_SVC:
154                    return miscRegs[MISCREG_SPSR_SVC];
155                  case MODE_MON:
156                    return miscRegs[MISCREG_SPSR_MON];
157                  case MODE_ABORT:
158                    return miscRegs[MISCREG_SPSR_ABT];
159                  case MODE_UNDEFINED:
160                    return miscRegs[MISCREG_SPSR_UND];
161                  default:
162                    return miscRegs[MISCREG_SPSR];
163                }
164            }
165            return miscRegs[misc_reg];
166        }
167
168        MiscReg
169        readMiscReg(int misc_reg, ThreadContext *tc)
170        {
171            if (misc_reg == MISCREG_CPSR) {
172                CPSR cpsr = miscRegs[misc_reg];
173                Addr pc = tc->readPC();
174                if (pc & (ULL(1) << PcJBitShift))
175                    cpsr.j = 1;
176                else
177                    cpsr.j = 0;
178                if (pc & (ULL(1) << PcTBitShift))
179                    cpsr.t = 1;
180                else
181                    cpsr.t = 0;
182                return cpsr;
183            }
184            if (misc_reg >= MISCREG_CP15_UNIMP_START &&
185                misc_reg < MISCREG_CP15_END) {
186                panic("Unimplemented CP15 register %s read.\n",
187                      miscRegName[misc_reg]);
188            }
189            switch (misc_reg) {
190              case MISCREG_CLIDR:
191                warn("The clidr register always reports 0 caches.\n");
192                break;
193              case MISCREG_CCSIDR:
194                warn("The ccsidr register isn't implemented and "
195                        "always reads as 0.\n");
196                break;
197            }
198            return readMiscRegNoEffect(misc_reg);
199        }
200
201        void
202        setMiscRegNoEffect(int misc_reg, const MiscReg &val)
203        {
204            assert(misc_reg < NumMiscRegs);
205            if (misc_reg == MISCREG_SPSR) {
206                CPSR cpsr = miscRegs[MISCREG_CPSR];
207                switch (cpsr.mode) {
208                  case MODE_USER:
209                    miscRegs[MISCREG_SPSR] = val;
210                    return;
211                  case MODE_FIQ:
212                    miscRegs[MISCREG_SPSR_FIQ] = val;
213                    return;
214                  case MODE_IRQ:
215                    miscRegs[MISCREG_SPSR_IRQ] = val;
216                    return;
217                  case MODE_SVC:
218                    miscRegs[MISCREG_SPSR_SVC] = val;
219                    return;
220                  case MODE_MON:
221                    miscRegs[MISCREG_SPSR_MON] = val;
222                    return;
223                  case MODE_ABORT:
224                    miscRegs[MISCREG_SPSR_ABT] = val;
225                    return;
226                  case MODE_UNDEFINED:
227                    miscRegs[MISCREG_SPSR_UND] = val;
228                    return;
229                  default:
230                    miscRegs[MISCREG_SPSR] = val;
231                    return;
232                }
233            }
234            miscRegs[misc_reg] = val;
235        }
236
237        void
238        setMiscReg(int misc_reg, const MiscReg &val, ThreadContext *tc)
239        {
240            MiscReg newVal = val;
241            if (misc_reg == MISCREG_CPSR) {
242                updateRegMap(val);
243                CPSR cpsr = val;
244                DPRINTF(Arm, "Updating CPSR to %#x f:%d i:%d a:%d mode:%#x\n",
245                        cpsr, cpsr.f, cpsr.i, cpsr.a, cpsr.mode);
246                Addr npc = tc->readNextPC() & ~PcModeMask;
247                if (cpsr.j)
248                    npc = npc | (ULL(1) << PcJBitShift);
249                if (cpsr.t)
250                    npc = npc | (ULL(1) << PcTBitShift);
251
252                tc->setNextPC(npc);
253            }
254            if (misc_reg >= MISCREG_CP15_UNIMP_START &&
255                misc_reg < MISCREG_CP15_END) {
256                panic("Unimplemented CP15 register %s wrote with %#x.\n",
257                      miscRegName[misc_reg], val);
258            }
259            switch (misc_reg) {
260              case MISCREG_CPACR:
261                {
262                    CPACR newCpacr = 0;
263                    CPACR valCpacr = val;
264                    newCpacr.cp10 = valCpacr.cp10;
265                    newCpacr.cp11 = valCpacr.cp11;
266                    if (newCpacr.cp10 != 0x3 || newCpacr.cp11 != 3) {
267                        panic("Disabling coprocessors isn't implemented.\n");
268                    }
269                    newVal = newCpacr;
270                }
271                break;
272              case MISCREG_CSSELR:
273                warn("The csselr register isn't implemented.\n");
274                break;
275            }
276            return setMiscRegNoEffect(misc_reg, newVal);
277        }
278
279        int
280        flattenIntIndex(int reg)
281        {
282            assert(reg >= 0);
283            if (reg < NUM_ARCH_INTREGS) {
284                return intRegMap[reg];
285            } else if (reg < NUM_INTREGS) {
286                return reg;
287            } else {
288                int mode = reg / intRegsPerMode;
289                reg = reg % intRegsPerMode;
290                switch (mode) {
291                  case MODE_USER:
292                  case MODE_SYSTEM:
293                    return INTREG_USR(reg);
294                  case MODE_FIQ:
295                    return INTREG_FIQ(reg);
296                  case MODE_IRQ:
297                    return INTREG_IRQ(reg);
298                  case MODE_SVC:
299                    return INTREG_SVC(reg);
300                  case MODE_MON:
301                    return INTREG_MON(reg);
302                  case MODE_ABORT:
303                    return INTREG_ABT(reg);
304                  case MODE_UNDEFINED:
305                    return INTREG_UND(reg);
306                  default:
307                    panic("Flattening into an unknown mode.\n");
308                }
309            }
310        }
311
312        int
313        flattenFloatIndex(int reg)
314        {
315            return reg;
316        }
317
318        void serialize(EventManager *em, std::ostream &os)
319        {}
320        void unserialize(EventManager *em, Checkpoint *cp,
321                const std::string &section)
322        {}
323
324        ISA()
325        {
326            clear();
327        }
328    };
329}
330
331#endif
332