faults.cc revision 8806:669e93d79ed9 
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 "base/trace.hh"
47#include "cpu/base.hh"
48#include "cpu/thread_context.hh"
49#include "debug/Faults.hh"
50#include "sim/full_system.hh"
51
52namespace ArmISA
53{
54
55template<> ArmFault::FaultVals ArmFaultVals<Reset>::vals =
56    {"reset", 0x00, MODE_SVC, 0, 0, true, true};
57
58template<> ArmFault::FaultVals ArmFaultVals<UndefinedInstruction>::vals =
59    {"Undefined Instruction", 0x04, MODE_UNDEFINED, 4 ,2, false, false} ;
60
61template<> ArmFault::FaultVals ArmFaultVals<SupervisorCall>::vals =
62    {"Supervisor Call", 0x08, MODE_SVC, 4, 2, false, false};
63
64template<> ArmFault::FaultVals ArmFaultVals<PrefetchAbort>::vals =
65    {"Prefetch Abort", 0x0C, MODE_ABORT, 4, 4, true, false};
66
67template<> ArmFault::FaultVals ArmFaultVals<DataAbort>::vals =
68    {"Data Abort", 0x10, MODE_ABORT, 8, 8, true, false};
69
70template<> ArmFault::FaultVals ArmFaultVals<Interrupt>::vals =
71    {"IRQ", 0x18, MODE_IRQ, 4, 4, true, false};
72
73template<> ArmFault::FaultVals ArmFaultVals<FastInterrupt>::vals =
74    {"FIQ", 0x1C, MODE_FIQ, 4, 4, true, true};
75
76template<> ArmFault::FaultVals ArmFaultVals<FlushPipe>::vals =
77    {"Pipe Flush", 0x00, MODE_SVC, 0, 0, true, true}; // some dummy values
78
79template<> ArmFault::FaultVals ArmFaultVals<ArmSev>::vals =
80    {"ArmSev Flush", 0x00, MODE_SVC, 0, 0, true, true}; // some dummy values
81Addr
82ArmFault::getVector(ThreadContext *tc)
83{
84    // ARM ARM B1-3
85
86    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
87
88    // panic if SCTLR.VE because I have no idea what to do with vectored
89    // interrupts
90    assert(!sctlr.ve);
91
92    if (!sctlr.v)
93        return offset();
94    return offset() + HighVecs;
95
96}
97
98void
99ArmFault::invoke(ThreadContext *tc, StaticInstPtr inst)
100{
101    // ARM ARM B1.6.3
102    FaultBase::invoke(tc);
103    if (!FullSystem)
104        return;
105    countStat()++;
106
107    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
108    CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
109    CPSR saved_cpsr = tc->readMiscReg(MISCREG_CPSR);
110    saved_cpsr.nz = tc->readIntReg(INTREG_CONDCODES_NZ);
111    saved_cpsr.c = tc->readIntReg(INTREG_CONDCODES_C);
112    saved_cpsr.v = tc->readIntReg(INTREG_CONDCODES_V);
113    saved_cpsr.ge = tc->readIntReg(INTREG_CONDCODES_GE);
114
115    Addr curPc M5_VAR_USED = tc->pcState().pc();
116    ITSTATE it = tc->pcState().itstate();
117    saved_cpsr.it2 = it.top6;
118    saved_cpsr.it1 = it.bottom2;
119
120    cpsr.mode = nextMode();
121    cpsr.it1 = cpsr.it2 = 0;
122    cpsr.j = 0;
123
124    cpsr.t = sctlr.te;
125    cpsr.a = cpsr.a | abortDisable();
126    cpsr.f = cpsr.f | fiqDisable();
127    cpsr.i = 1;
128    cpsr.e = sctlr.ee;
129    tc->setMiscReg(MISCREG_CPSR, cpsr);
130    // Make sure mailbox sets to one always
131    tc->setMiscReg(MISCREG_SEV_MAILBOX, 1);
132    tc->setIntReg(INTREG_LR, curPc +
133            (saved_cpsr.t ? thumbPcOffset() : armPcOffset()));
134
135    switch (nextMode()) {
136      case MODE_FIQ:
137        tc->setMiscReg(MISCREG_SPSR_FIQ, saved_cpsr);
138        break;
139      case MODE_IRQ:
140        tc->setMiscReg(MISCREG_SPSR_IRQ, saved_cpsr);
141        break;
142      case MODE_SVC:
143        tc->setMiscReg(MISCREG_SPSR_SVC, saved_cpsr);
144        break;
145      case MODE_UNDEFINED:
146        tc->setMiscReg(MISCREG_SPSR_UND, saved_cpsr);
147        break;
148      case MODE_ABORT:
149        tc->setMiscReg(MISCREG_SPSR_ABT, saved_cpsr);
150        break;
151      default:
152        panic("unknown Mode\n");
153    }
154
155    Addr newPc = getVector(tc);
156    DPRINTF(Faults, "Invoking Fault:%s cpsr:%#x PC:%#x lr:%#x newVec: %#x\n",
157            name(), cpsr, curPc, tc->readIntReg(INTREG_LR), newPc);
158    PCState pc(newPc);
159    pc.thumb(cpsr.t);
160    pc.nextThumb(pc.thumb());
161    pc.jazelle(cpsr.j);
162    pc.nextJazelle(pc.jazelle());
163    tc->pcState(pc);
164}
165
166void
167Reset::invoke(ThreadContext *tc, StaticInstPtr inst)
168{
169    if (FullSystem) {
170        tc->getCpuPtr()->clearInterrupts();
171        tc->clearArchRegs();
172    }
173    ArmFault::invoke(tc, inst);
174}
175
176void
177UndefinedInstruction::invoke(ThreadContext *tc, StaticInstPtr inst)
178{
179    if (FullSystem) {
180        ArmFault::invoke(tc, inst);
181        return;
182    }
183
184    // If the mnemonic isn't defined this has to be an unknown instruction.
185    assert(unknown || mnemonic != NULL);
186    if (disabled) {
187        panic("Attempted to execute disabled instruction "
188                "'%s' (inst 0x%08x)", mnemonic, machInst);
189    } else if (unknown) {
190        panic("Attempted to execute unknown instruction (inst 0x%08x)",
191              machInst);
192    } else {
193        panic("Attempted to execute unimplemented instruction "
194                "'%s' (inst 0x%08x)", mnemonic, machInst);
195    }
196}
197
198void
199SupervisorCall::invoke(ThreadContext *tc, StaticInstPtr inst)
200{
201    if (FullSystem) {
202        ArmFault::invoke(tc, inst);
203        return;
204    }
205
206    // As of now, there isn't a 32 bit thumb version of this instruction.
207    assert(!machInst.bigThumb);
208    uint32_t callNum;
209    callNum = tc->readIntReg(INTREG_R7);
210    tc->syscall(callNum);
211
212    // Advance the PC since that won't happen automatically.
213    PCState pc = tc->pcState();
214    assert(inst);
215    inst->advancePC(pc);
216    tc->pcState(pc);
217}
218
219template<class T>
220void
221AbortFault<T>::invoke(ThreadContext *tc, StaticInstPtr inst)
222{
223    ArmFaultVals<T>::invoke(tc, inst);
224    FSR fsr = 0;
225    fsr.fsLow = bits(status, 3, 0);
226    fsr.fsHigh = bits(status, 4);
227    fsr.domain = domain;
228    fsr.wnr = (write ? 1 : 0);
229    fsr.ext = 0;
230    tc->setMiscReg(T::FsrIndex, fsr);
231    tc->setMiscReg(T::FarIndex, faultAddr);
232
233    DPRINTF(Faults, "Abort Fault fsr=%#x faultAddr=%#x\n", fsr, faultAddr);
234}
235
236void
237FlushPipe::invoke(ThreadContext *tc, StaticInstPtr inst) {
238    DPRINTF(Faults, "Invoking FlushPipe Fault\n");
239
240    // Set the PC to the next instruction of the faulting instruction.
241    // Net effect is simply squashing all instructions behind and
242    // start refetching from the next instruction.
243    PCState pc = tc->pcState();
244    assert(inst);
245    inst->advancePC(pc);
246    tc->pcState(pc);
247}
248
249template void AbortFault<PrefetchAbort>::invoke(ThreadContext *tc,
250                                                StaticInstPtr inst);
251template void AbortFault<DataAbort>::invoke(ThreadContext *tc,
252                                            StaticInstPtr inst);
253
254void
255ArmSev::invoke(ThreadContext *tc, StaticInstPtr inst) {
256    DPRINTF(Faults, "Invoking ArmSev Fault\n");
257    if (!FullSystem)
258        return;
259
260    // Set sev_mailbox to 1, clear the pending interrupt from remote
261    // SEV execution and let pipeline continue as pcState is still
262    // valid.
263    tc->setMiscReg(MISCREG_SEV_MAILBOX, 1);
264    tc->getCpuPtr()->clearInterrupt(INT_SEV, 0);
265}
266
267// return via SUBS pc, lr, xxx; rfe, movs, ldm
268
269} // namespace ArmISA
270