faults.cc revision 6735:6437ad24a8a0 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * Copyright (c) 2007-2008 The Florida State University
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Ali Saidi
30 *          Gabe Black
31 */
32
33#include "arch/arm/faults.hh"
34#include "cpu/thread_context.hh"
35#include "cpu/base.hh"
36#include "base/trace.hh"
37
38namespace ArmISA
39{
40
41template<> ArmFaultBase::FaultVals ArmFault<Reset>::vals =
42    {"reset", 0x00, MODE_SVC, 0, 0, true, true};
43
44template<> ArmFaultBase::FaultVals ArmFault<UndefinedInstruction>::vals =
45    {"Undefined Instruction", 0x04, MODE_UNDEFINED, 4 ,2, false, false} ;
46
47template<> ArmFaultBase::FaultVals ArmFault<SupervisorCall>::vals =
48    {"Supervisor Call", 0x08, MODE_SVC, 4, 2, false, false};
49
50template<> ArmFaultBase::FaultVals ArmFault<PrefetchAbort>::vals =
51    {"Prefetch Abort", 0x0C, MODE_ABORT, 4, 4, true, false};
52
53template<> ArmFaultBase::FaultVals ArmFault<DataAbort>::vals =
54    {"Data Abort", 0x10, MODE_ABORT, 8, 8, true, false};
55
56template<> ArmFaultBase::FaultVals ArmFault<Interrupt>::vals =
57    {"IRQ", 0x18, MODE_IRQ, 4, 4, true, false};
58
59template<> ArmFaultBase::FaultVals ArmFault<FastInterrupt>::vals =
60    {"FIQ", 0x1C, MODE_FIQ, 4, 4, true, true};
61
62Addr
63ArmFaultBase::getVector(ThreadContext *tc)
64{
65    // ARM ARM B1-3
66
67    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
68
69    // panic if SCTLR.VE because I have no idea what to do with vectored
70    // interrupts
71    assert(!sctlr.ve);
72
73    if (!sctlr.v)
74        return offset();
75    return offset() + HighVecs;
76
77}
78
79#if FULL_SYSTEM
80
81void
82ArmFaultBase::invoke(ThreadContext *tc)
83{
84    // ARM ARM B1.6.3
85    FaultBase::invoke(tc);
86    countStat()++;
87
88    SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
89    CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
90    CPSR saved_cpsr = tc->readMiscReg(MISCREG_CPSR) |
91                      tc->readIntReg(INTREG_CONDCODES);
92
93
94    cpsr.mode = nextMode();
95    cpsr.it1 = cpsr.it2 = 0;
96    cpsr.j = 0;
97
98    if (sctlr.te)
99       cpsr.t = 1;
100    cpsr.a = cpsr.a | abortDisable();
101    cpsr.f = cpsr.f | fiqDisable();
102    cpsr.i = 1;
103    tc->setMiscReg(MISCREG_CPSR, cpsr);
104    tc->setIntReg(INTREG_LR, tc->readPC() +
105            (saved_cpsr.t ? thumbPcOffset() : armPcOffset()));
106
107    switch (nextMode()) {
108      case MODE_FIQ:
109        tc->setMiscReg(MISCREG_SPSR_FIQ, saved_cpsr);
110        break;
111      case MODE_IRQ:
112        tc->setMiscReg(MISCREG_SPSR_IRQ, saved_cpsr);
113        break;
114      case MODE_SVC:
115        tc->setMiscReg(MISCREG_SPSR_SVC, saved_cpsr);
116        break;
117      case MODE_UNDEFINED:
118        tc->setMiscReg(MISCREG_SPSR_UND, saved_cpsr);
119        break;
120      case MODE_ABORT:
121        tc->setMiscReg(MISCREG_SPSR_ABT, saved_cpsr);
122        break;
123      default:
124        panic("unknown Mode\n");
125    }
126
127    DPRINTF(Faults, "Invoking Fault: %s cpsr: %#x PC: %#x lr: %#x\n", name(), cpsr,
128            tc->readPC(), tc->readIntReg(INTREG_LR));
129    tc->setPC(getVector(tc));
130    tc->setNextPC(getVector(tc) + cpsr.t ? 2 : 4 );
131}
132#endif // FULL_SYSTEM
133
134// return via SUBS pc, lr, xxx; rfe, movs, ldm
135
136
137
138} // namespace ArmISA
139
140