faults.cc revision 7720:65d338a8dba4 
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) 2003-2005 The Regents of The University of Michigan
15 * Copyright (c) 2007-2008 The Florida State University
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Ali Saidi
42 *          Gabe Black
43 */
44
45#include "arch/arm/faults.hh"
46#include "cpu/thread_context.hh"
47#include "cpu/base.hh"
48#include "base/trace.hh"
49
50namespace ArmISA
51{
52
53template<> ArmFault::FaultVals ArmFaultVals<Reset>::vals =
54    {"reset", 0x00, MODE_SVC, 0, 0, true, true};
55
56template<> ArmFault::FaultVals ArmFaultVals<UndefinedInstruction>::vals =
57    {"Undefined Instruction", 0x04, MODE_UNDEFINED, 4 ,2, false, false} ;
58
59template<> ArmFault::FaultVals ArmFaultVals<SupervisorCall>::vals =
60    {"Supervisor Call", 0x08, MODE_SVC, 4, 2, false, false};
61
62template<> ArmFault::FaultVals ArmFaultVals<PrefetchAbort>::vals =
63    {"Prefetch Abort", 0x0C, MODE_ABORT, 4, 4, true, false};
64
65template<> ArmFault::FaultVals ArmFaultVals<DataAbort>::vals =
66    {"Data Abort", 0x10, MODE_ABORT, 8, 8, true, false};
67
68template<> ArmFault::FaultVals ArmFaultVals<Interrupt>::vals =
69    {"IRQ", 0x18, MODE_IRQ, 4, 4, true, false};
70
71template<> ArmFault::FaultVals ArmFaultVals<FastInterrupt>::vals =
72    {"FIQ", 0x1C, MODE_FIQ, 4, 4, true, true};
73
74template<> ArmFault::FaultVals ArmFaultVals<FlushPipe>::vals =
75    {"Pipe Flush", 0x00, MODE_SVC, 0, 0, true, true}; // some dummy values
76
77Addr
78ArmFault::getVector(ThreadContext *tc)
79{
80    // ARM ARM B1-3
81
82    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
83
84    // panic if SCTLR.VE because I have no idea what to do with vectored
85    // interrupts
86    assert(!sctlr.ve);
87
88    if (!sctlr.v)
89        return offset();
90    return offset() + HighVecs;
91
92}
93
94#if FULL_SYSTEM
95
96void
97ArmFault::invoke(ThreadContext *tc, StaticInstPtr inst)
98{
99    // ARM ARM B1.6.3
100    FaultBase::invoke(tc);
101    countStat()++;
102
103    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
104    CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
105    CPSR saved_cpsr = tc->readMiscReg(MISCREG_CPSR) |
106                      tc->readIntReg(INTREG_CONDCODES);
107    Addr curPc M5_VAR_USED = tc->pcState().pc();
108
109
110    cpsr.mode = nextMode();
111    cpsr.it1 = cpsr.it2 = 0;
112    cpsr.j = 0;
113
114    cpsr.t = sctlr.te;
115    cpsr.a = cpsr.a | abortDisable();
116    cpsr.f = cpsr.f | fiqDisable();
117    cpsr.i = 1;
118    cpsr.e = sctlr.ee;
119    tc->setMiscReg(MISCREG_CPSR, cpsr);
120    tc->setIntReg(INTREG_LR, curPc +
121            (saved_cpsr.t ? thumbPcOffset() : armPcOffset()));
122
123    switch (nextMode()) {
124      case MODE_FIQ:
125        tc->setMiscReg(MISCREG_SPSR_FIQ, saved_cpsr);
126        break;
127      case MODE_IRQ:
128        tc->setMiscReg(MISCREG_SPSR_IRQ, saved_cpsr);
129        break;
130      case MODE_SVC:
131        tc->setMiscReg(MISCREG_SPSR_SVC, saved_cpsr);
132        break;
133      case MODE_UNDEFINED:
134        tc->setMiscReg(MISCREG_SPSR_UND, saved_cpsr);
135        break;
136      case MODE_ABORT:
137        tc->setMiscReg(MISCREG_SPSR_ABT, saved_cpsr);
138        break;
139      default:
140        panic("unknown Mode\n");
141    }
142
143    Addr newPc = getVector(tc);
144    DPRINTF(Faults, "Invoking Fault:%s cpsr:%#x PC:%#x lr:%#x newVec: %#x\n",
145            name(), cpsr, curPc, tc->readIntReg(INTREG_LR), newPc);
146    PCState pc(newPc);
147    pc.thumb(cpsr.t);
148    pc.nextThumb(pc.thumb());
149    pc.jazelle(cpsr.j);
150    pc.nextJazelle(pc.jazelle());
151    tc->pcState(pc);
152}
153
154void
155Reset::invoke(ThreadContext *tc, StaticInstPtr inst)
156{
157    tc->getCpuPtr()->clearInterrupts();
158    tc->clearArchRegs();
159    ArmFault::invoke(tc);
160}
161
162#else
163
164void
165UndefinedInstruction::invoke(ThreadContext *tc, StaticInstPtr inst)
166{
167    // If the mnemonic isn't defined this has to be an unknown instruction.
168    assert(unknown || mnemonic != NULL);
169    if (disabled) {
170        panic("Attempted to execute disabled instruction "
171                "'%s' (inst 0x%08x)", mnemonic, machInst);
172    } else if (unknown) {
173        panic("Attempted to execute unknown instruction (inst 0x%08x)",
174              machInst);
175    } else {
176        panic("Attempted to execute unimplemented instruction "
177                "'%s' (inst 0x%08x)", mnemonic, machInst);
178    }
179}
180
181void
182SupervisorCall::invoke(ThreadContext *tc, StaticInstPtr inst)
183{
184    // As of now, there isn't a 32 bit thumb version of this instruction.
185    assert(!machInst.bigThumb);
186    uint32_t callNum;
187    if (machInst.thumb) {
188        callNum = bits(machInst, 7, 0);
189    } else {
190        callNum = bits(machInst, 23, 0);
191    }
192    if (callNum == 0) {
193        callNum = tc->readIntReg(INTREG_R7);
194    }
195    tc->syscall(callNum);
196
197    // Advance the PC since that won't happen automatically.
198    PCState pc = tc->pcState();
199    assert(inst);
200    inst->advancePC(pc);
201    tc->pcState(pc);
202}
203
204#endif // FULL_SYSTEM
205
206template<class T>
207void
208AbortFault<T>::invoke(ThreadContext *tc, StaticInstPtr inst)
209{
210    ArmFaultVals<T>::invoke(tc);
211    FSR fsr = 0;
212    fsr.fsLow = bits(status, 3, 0);
213    fsr.fsHigh = bits(status, 4);
214    fsr.domain = domain;
215    fsr.wnr = (write ? 1 : 0);
216    fsr.ext = 0;
217    tc->setMiscReg(T::FsrIndex, fsr);
218    tc->setMiscReg(T::FarIndex, faultAddr);
219}
220
221void
222FlushPipe::invoke(ThreadContext *tc, StaticInstPtr inst) {
223    DPRINTF(Faults, "Invoking FlushPipe Fault\n");
224
225    // Set the PC to the next instruction of the faulting instruction.
226    // Net effect is simply squashing all instructions behind and
227    // start refetching from the next instruction.
228    PCState pc = tc->pcState();
229    assert(inst);
230    inst->advancePC(pc);
231    tc->pcState(pc);
232}
233
234template void AbortFault<PrefetchAbort>::invoke(ThreadContext *tc,
235                                                StaticInstPtr inst);
236template void AbortFault<DataAbort>::invoke(ThreadContext *tc,
237                                            StaticInstPtr inst);
238
239// return via SUBS pc, lr, xxx; rfe, movs, ldm
240
241} // namespace ArmISA
242