faults.cc revision 7625:b1e69203bae9 
1/*
2 * Copyright (c) 2007 The Hewlett-Packard Development Company
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) 2003-2007 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#include "arch/x86/decoder.hh"
44#include "arch/x86/faults.hh"
45#include "base/trace.hh"
46#include "config/full_system.hh"
47#include "cpu/thread_context.hh"
48#if !FULL_SYSTEM
49#include "arch/x86/isa_traits.hh"
50#include "mem/page_table.hh"
51#include "sim/process.hh"
52#else
53#include "arch/x86/tlb.hh"
54#endif
55
56namespace X86ISA
57{
58#if FULL_SYSTEM
59    void X86FaultBase::invoke(ThreadContext * tc)
60    {
61        Addr pc = tc->readPC();
62        DPRINTF(Faults, "RIP %#x: vector %d: %s\n", pc, vector, describe());
63        using namespace X86ISAInst::RomLabels;
64        HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
65        MicroPC entry;
66        if (m5reg.mode == LongMode) {
67            if (isSoft()) {
68                entry = extern_label_longModeSoftInterrupt;
69            } else {
70                entry = extern_label_longModeInterrupt;
71            }
72        } else {
73            entry = extern_label_legacyModeInterrupt;
74        }
75        tc->setIntReg(INTREG_MICRO(1), vector);
76        tc->setIntReg(INTREG_MICRO(7), pc);
77        if (errorCode != (uint64_t)(-1)) {
78            if (m5reg.mode == LongMode) {
79                entry = extern_label_longModeInterruptWithError;
80            } else {
81                panic("Legacy mode interrupts with error codes "
82                        "aren't implementde.\n");
83            }
84            // Software interrupts shouldn't have error codes. If one does,
85            // there would need to be microcode to set it up.
86            assert(!isSoft());
87            tc->setIntReg(INTREG_MICRO(15), errorCode);
88        }
89        tc->setMicroPC(romMicroPC(entry));
90        tc->setNextMicroPC(romMicroPC(entry) + 1);
91    }
92
93    std::string
94    X86FaultBase::describe() const
95    {
96        std::stringstream ss;
97        ccprintf(ss, "%s", mnemonic());
98        if (errorCode != (uint64_t)(-1)) {
99            ccprintf(ss, "(%#x)", errorCode);
100        }
101
102        return ss.str();
103    }
104
105    void X86Trap::invoke(ThreadContext * tc)
106    {
107        X86FaultBase::invoke(tc);
108        // This is the same as a fault, but it happens -after- the instruction.
109        tc->setPC(tc->readNextPC());
110        tc->setNextPC(tc->readNextNPC());
111        tc->setNextNPC(tc->readNextNPC() + sizeof(MachInst));
112    }
113
114    void X86Abort::invoke(ThreadContext * tc)
115    {
116        panic("Abort exception!");
117    }
118
119    void PageFault::invoke(ThreadContext * tc)
120    {
121        HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
122        X86FaultBase::invoke(tc);
123        /*
124         * If something bad happens while trying to enter the page fault
125         * handler, I'm pretty sure that's a double fault and then all bets are
126         * off. That means it should be safe to update this state now.
127         */
128        if (m5reg.mode == LongMode) {
129            tc->setMiscReg(MISCREG_CR2, addr);
130        } else {
131            tc->setMiscReg(MISCREG_CR2, (uint32_t)addr);
132        }
133    }
134
135    std::string
136    PageFault::describe() const
137    {
138        std::stringstream ss;
139        ccprintf(ss, "%s at %#x", X86FaultBase::describe(), addr);
140        return ss.str();
141    }
142
143    void
144    InitInterrupt::invoke(ThreadContext *tc)
145    {
146        DPRINTF(Faults, "Init interrupt.\n");
147        // The otherwise unmodified integer registers should be set to 0.
148        for (int index = 0; index < NUM_INTREGS; index++) {
149            tc->setIntReg(index, 0);
150        }
151
152        CR0 cr0 = tc->readMiscReg(MISCREG_CR0);
153        CR0 newCR0 = 1 << 4;
154        newCR0.cd = cr0.cd;
155        newCR0.nw = cr0.nw;
156        tc->setMiscReg(MISCREG_CR0, newCR0);
157        tc->setMiscReg(MISCREG_CR2, 0);
158        tc->setMiscReg(MISCREG_CR3, 0);
159        tc->setMiscReg(MISCREG_CR4, 0);
160
161        tc->setMiscReg(MISCREG_RFLAGS, 0x0000000000000002ULL);
162
163        tc->setMiscReg(MISCREG_EFER, 0);
164
165        SegAttr dataAttr = 0;
166        dataAttr.dpl = 0;
167        dataAttr.unusable = 0;
168        dataAttr.defaultSize = 0;
169        dataAttr.longMode = 0;
170        dataAttr.avl = 0;
171        dataAttr.granularity = 0;
172        dataAttr.present = 1;
173        dataAttr.type = 3;
174        dataAttr.writable = 1;
175        dataAttr.readable = 1;
176        dataAttr.expandDown = 0;
177        dataAttr.system = 1;
178
179        for (int seg = 0; seg != NUM_SEGMENTREGS; seg++) {
180            tc->setMiscReg(MISCREG_SEG_SEL(seg), 0);
181            tc->setMiscReg(MISCREG_SEG_BASE(seg), 0);
182            tc->setMiscReg(MISCREG_SEG_EFF_BASE(seg), 0);
183            tc->setMiscReg(MISCREG_SEG_LIMIT(seg), 0xffff);
184            tc->setMiscReg(MISCREG_SEG_ATTR(seg), dataAttr);
185        }
186
187        SegAttr codeAttr = 0;
188        codeAttr.dpl = 0;
189        codeAttr.unusable = 0;
190        codeAttr.defaultSize = 0;
191        codeAttr.longMode = 0;
192        codeAttr.avl = 0;
193        codeAttr.granularity = 0;
194        codeAttr.present = 1;
195        codeAttr.type = 10;
196        codeAttr.writable = 0;
197        codeAttr.readable = 1;
198        codeAttr.expandDown = 0;
199        codeAttr.system = 1;
200
201        tc->setMiscReg(MISCREG_CS, 0xf000);
202        tc->setMiscReg(MISCREG_CS_BASE,
203                0x00000000ffff0000ULL);
204        tc->setMiscReg(MISCREG_CS_EFF_BASE,
205                0x00000000ffff0000ULL);
206        // This has the base value pre-added.
207        tc->setMiscReg(MISCREG_CS_LIMIT, 0xffffffff);
208        tc->setMiscReg(MISCREG_CS_ATTR, codeAttr);
209
210        tc->setPC(0x000000000000fff0ULL +
211                tc->readMiscReg(MISCREG_CS_BASE));
212        tc->setNextPC(tc->readPC() + sizeof(MachInst));
213
214        tc->setMiscReg(MISCREG_TSG_BASE, 0);
215        tc->setMiscReg(MISCREG_TSG_LIMIT, 0xffff);
216
217        tc->setMiscReg(MISCREG_IDTR_BASE, 0);
218        tc->setMiscReg(MISCREG_IDTR_LIMIT, 0xffff);
219
220        tc->setMiscReg(MISCREG_TSL, 0);
221        tc->setMiscReg(MISCREG_TSL_BASE, 0);
222        tc->setMiscReg(MISCREG_TSL_LIMIT, 0xffff);
223        tc->setMiscReg(MISCREG_TSL_ATTR, 0);
224
225        tc->setMiscReg(MISCREG_TR, 0);
226        tc->setMiscReg(MISCREG_TR_BASE, 0);
227        tc->setMiscReg(MISCREG_TR_LIMIT, 0xffff);
228        tc->setMiscReg(MISCREG_TR_ATTR, 0);
229
230        // This value should be the family/model/stepping of the processor.
231        // (page 418). It should be consistent with the value from CPUID, but
232        // the actual value probably doesn't matter much.
233        tc->setIntReg(INTREG_RDX, 0);
234
235        tc->setMiscReg(MISCREG_DR0, 0);
236        tc->setMiscReg(MISCREG_DR1, 0);
237        tc->setMiscReg(MISCREG_DR2, 0);
238        tc->setMiscReg(MISCREG_DR3, 0);
239
240        tc->setMiscReg(MISCREG_DR6, 0x00000000ffff0ff0ULL);
241        tc->setMiscReg(MISCREG_DR7, 0x0000000000000400ULL);
242
243        // Update the handy M5 Reg.
244        tc->setMiscReg(MISCREG_M5_REG, 0);
245        MicroPC entry = X86ISAInst::RomLabels::extern_label_initIntHalt;
246        tc->setMicroPC(romMicroPC(entry));
247        tc->setNextMicroPC(romMicroPC(entry) + 1);
248    }
249
250    void
251    StartupInterrupt::invoke(ThreadContext *tc)
252    {
253        DPRINTF(Faults, "Startup interrupt with vector %#x.\n", vector);
254        HandyM5Reg m5Reg = tc->readMiscReg(MISCREG_M5_REG);
255        if (m5Reg.mode != LegacyMode || m5Reg.submode != RealMode) {
256            panic("Startup IPI recived outside of real mode. "
257                    "Don't know what to do. %d, %d", m5Reg.mode, m5Reg.submode);
258        }
259
260        tc->setMiscReg(MISCREG_CS, vector << 8);
261        tc->setMiscReg(MISCREG_CS_BASE, vector << 12);
262        tc->setMiscReg(MISCREG_CS_EFF_BASE, vector << 12);
263        // This has the base value pre-added.
264        tc->setMiscReg(MISCREG_CS_LIMIT, 0xffff);
265
266        tc->setPC(tc->readMiscReg(MISCREG_CS_BASE));
267        tc->setNextPC(tc->readPC() + sizeof(MachInst));
268    }
269
270#else
271
272    void
273    PageFault::invoke(ThreadContext * tc)
274    {
275        PageFaultErrorCode code = errorCode;
276        const char *modeStr = "";
277        if (code.fetch)
278            modeStr = "execute";
279        else if (code.write)
280            modeStr = "write";
281        else
282            modeStr = "read";
283        panic("Tried to %s unmapped address %#x.\n", modeStr, addr);
284    }
285
286#endif
287} // namespace X86ISA
288
289