exec_context.hh revision 12109 
1/*
2 * Copyright (c) 2014, 2016 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) 2002-2005 The Regents of The University of Michigan
15 * Copyright (c) 2015 Advanced Micro Devices, Inc.
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: Kevin Lim
42 *          Andreas Sandberg
43 */
44
45#ifndef __CPU_EXEC_CONTEXT_HH__
46#define __CPU_EXEC_CONTEXT_HH__
47
48#include "arch/registers.hh"
49#include "base/types.hh"
50#include "config/the_isa.hh"
51#include "cpu/base.hh"
52#include "cpu/reg_class.hh"
53#include "cpu/static_inst_fwd.hh"
54#include "cpu/translation.hh"
55#include "mem/request.hh"
56
57/**
58 * The ExecContext is an abstract base class the provides the
59 * interface used by the ISA to manipulate the state of the CPU model.
60 *
61 * Register accessor methods in this class typically provide the index
62 * of the instruction's operand (e.g., 0 or 1), not the architectural
63 * register index, to simplify the implementation of register
64 * renaming.  The architectural register index can be found by
65 * indexing into the instruction's own operand index table.
66 *
67 * @note The methods in this class typically take a raw pointer to the
68 * StaticInst is provided instead of a ref-counted StaticInstPtr to
69 * reduce overhead as an argument. This is fine as long as the
70 * implementation doesn't copy the pointer into any long-term storage
71 * (which is pretty hard to imagine they would have reason to do).
72 */
73class ExecContext {
74  public:
75    typedef TheISA::IntReg IntReg;
76    typedef TheISA::PCState PCState;
77    typedef TheISA::FloatReg FloatReg;
78    typedef TheISA::FloatRegBits FloatRegBits;
79    typedef TheISA::MiscReg MiscReg;
80
81    typedef TheISA::CCReg CCReg;
82    using VecRegContainer = TheISA::VecRegContainer;
83    using VecElem = TheISA::VecElem;
84
85  public:
86    /**
87     * @{
88     * @name Integer Register Interfaces
89     *
90     */
91
92    /** Reads an integer register. */
93    virtual IntReg readIntRegOperand(const StaticInst *si, int idx) = 0;
94
95    /** Sets an integer register to a value. */
96    virtual void setIntRegOperand(const StaticInst *si,
97                                  int idx, IntReg val) = 0;
98
99    /** @} */
100
101
102    /**
103     * @{
104     * @name Floating Point Register Interfaces
105     */
106
107    /** Reads a floating point register of single register width. */
108    virtual FloatReg readFloatRegOperand(const StaticInst *si, int idx) = 0;
109
110    /** Reads a floating point register in its binary format, instead
111     * of by value. */
112    virtual FloatRegBits readFloatRegOperandBits(const StaticInst *si,
113                                                 int idx) = 0;
114
115    /** Sets a floating point register of single width to a value. */
116    virtual void setFloatRegOperand(const StaticInst *si,
117                                    int idx, FloatReg val) = 0;
118
119    /** Sets the bits of a floating point register of single width
120     * to a binary value. */
121    virtual void setFloatRegOperandBits(const StaticInst *si,
122                                        int idx, FloatRegBits val) = 0;
123
124    /** @} */
125
126    /** Vector Register Interfaces. */
127    /** @{ */
128    /** Reads source vector register operand. */
129    virtual const VecRegContainer&
130    readVecRegOperand(const StaticInst *si, int idx) const = 0;
131
132    /** Gets destination vector register operand for modification. */
133    virtual VecRegContainer&
134    getWritableVecRegOperand(const StaticInst *si, int idx) = 0;
135
136    /** Sets a destination vector register operand to a value. */
137    virtual void
138    setVecRegOperand(const StaticInst *si, int idx,
139                     const VecRegContainer& val) = 0;
140    /** @} */
141
142    /** Vector Register Lane Interfaces. */
143    /** @{ */
144    /** Reads source vector 8bit operand. */
145    virtual ConstVecLane8
146    readVec8BitLaneOperand(const StaticInst *si, int idx) const = 0;
147
148    /** Reads source vector 16bit operand. */
149    virtual ConstVecLane16
150    readVec16BitLaneOperand(const StaticInst *si, int idx) const = 0;
151
152    /** Reads source vector 32bit operand. */
153    virtual ConstVecLane32
154    readVec32BitLaneOperand(const StaticInst *si, int idx) const = 0;
155
156    /** Reads source vector 64bit operand. */
157    virtual ConstVecLane64
158    readVec64BitLaneOperand(const StaticInst *si, int idx) const = 0;
159
160    /** Write a lane of the destination vector operand. */
161    /** @{ */
162    virtual void setVecLaneOperand(const StaticInst *si, int idx,
163            const LaneData<LaneSize::Byte>& val) = 0;
164    virtual void setVecLaneOperand(const StaticInst *si, int idx,
165            const LaneData<LaneSize::TwoByte>& val) = 0;
166    virtual void setVecLaneOperand(const StaticInst *si, int idx,
167            const LaneData<LaneSize::FourByte>& val) = 0;
168    virtual void setVecLaneOperand(const StaticInst *si, int idx,
169            const LaneData<LaneSize::EightByte>& val) = 0;
170    /** @} */
171
172    /** Vector Elem Interfaces. */
173    /** @{ */
174    /** Reads an element of a vector register. */
175    virtual VecElem readVecElemOperand(const StaticInst *si,
176                                        int idx) const = 0;
177
178    /** Sets a vector register to a value. */
179    virtual void setVecElemOperand(const StaticInst *si, int idx,
180                                   const VecElem val) = 0;
181    /** @} */
182
183    /**
184     * @{
185     * @name Condition Code Registers
186     */
187    virtual CCReg readCCRegOperand(const StaticInst *si, int idx) = 0;
188    virtual void setCCRegOperand(const StaticInst *si, int idx, CCReg val) = 0;
189    /** @} */
190
191    /**
192     * @{
193     * @name Misc Register Interfaces
194     */
195    virtual MiscReg readMiscRegOperand(const StaticInst *si, int idx) = 0;
196    virtual void setMiscRegOperand(const StaticInst *si,
197                                   int idx, const MiscReg &val) = 0;
198
199    /**
200     * Reads a miscellaneous register, handling any architectural
201     * side effects due to reading that register.
202     */
203    virtual MiscReg readMiscReg(int misc_reg) = 0;
204
205    /**
206     * Sets a miscellaneous register, handling any architectural
207     * side effects due to writing that register.
208     */
209    virtual void setMiscReg(int misc_reg, const MiscReg &val) = 0;
210
211    /** @} */
212
213    /**
214     * @{
215     * @name PC Control
216     */
217    virtual PCState pcState() const = 0;
218    virtual void pcState(const PCState &val) = 0;
219    /** @} */
220
221    /**
222     * @{
223     * @name Memory Interface
224     */
225    /**
226     * Record the effective address of the instruction.
227     *
228     * @note Only valid for memory ops.
229     */
230    virtual void setEA(Addr EA) = 0;
231    /**
232     * Get the effective address of the instruction.
233     *
234     * @note Only valid for memory ops.
235     */
236    virtual Addr getEA() const = 0;
237
238    /**
239     * Perform an atomic memory read operation.  Must be overridden
240     * for exec contexts that support atomic memory mode.  Not pure
241     * virtual since exec contexts that only support timing memory
242     * mode need not override (though in that case this function
243     * should never be called).
244     */
245    virtual Fault readMem(Addr addr, uint8_t *data, unsigned int size,
246                          Request::Flags flags)
247    {
248        panic("ExecContext::readMem() should be overridden\n");
249    }
250
251    /**
252     * Initiate a timing memory read operation.  Must be overridden
253     * for exec contexts that support timing memory mode.  Not pure
254     * virtual since exec contexts that only support atomic memory
255     * mode need not override (though in that case this function
256     * should never be called).
257     */
258    virtual Fault initiateMemRead(Addr addr, unsigned int size,
259                                  Request::Flags flags)
260    {
261        panic("ExecContext::initiateMemRead() should be overridden\n");
262    }
263
264    /**
265     * For atomic-mode contexts, perform an atomic memory write operation.
266     * For timing-mode contexts, initiate a timing memory write operation.
267     */
268    virtual Fault writeMem(uint8_t *data, unsigned int size, Addr addr,
269                           Request::Flags flags, uint64_t *res) = 0;
270
271    /**
272     * Sets the number of consecutive store conditional failures.
273     */
274    virtual void setStCondFailures(unsigned int sc_failures) = 0;
275
276    /**
277     * Returns the number of consecutive store conditional failures.
278     */
279    virtual unsigned int readStCondFailures() const = 0;
280
281    /** @} */
282
283    /**
284     * @{
285     * @name SysCall Emulation Interfaces
286     */
287
288    /**
289     * Executes a syscall specified by the callnum.
290     */
291    virtual void syscall(int64_t callnum, Fault *fault) = 0;
292
293    /** @} */
294
295    /** Returns a pointer to the ThreadContext. */
296    virtual ThreadContext *tcBase() = 0;
297
298    /**
299     * @{
300     * @name Alpha-Specific Interfaces
301     */
302
303    /**
304     * Somewhat Alpha-specific function that handles returning from an
305     * error or interrupt.
306     */
307    virtual Fault hwrei() = 0;
308
309    /**
310     * Check for special simulator handling of specific PAL calls.  If
311     * return value is false, actual PAL call will be suppressed.
312     */
313    virtual bool simPalCheck(int palFunc) = 0;
314
315    /** @} */
316
317    /**
318     * @{
319     * @name ARM-Specific Interfaces
320     */
321
322    virtual bool readPredicate() = 0;
323    virtual void setPredicate(bool val) = 0;
324
325    /** @} */
326
327    /**
328     * @{
329     * @name X86-Specific Interfaces
330     */
331
332    /**
333     * Invalidate a page in the DTLB <i>and</i> ITLB.
334     */
335    virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
336    virtual void armMonitor(Addr address) = 0;
337    virtual bool mwait(PacketPtr pkt) = 0;
338    virtual void mwaitAtomic(ThreadContext *tc) = 0;
339    virtual AddressMonitor *getAddrMonitor() = 0;
340
341    /** @} */
342
343    /**
344     * @{
345     * @name MIPS-Specific Interfaces
346     */
347
348#if THE_ISA == MIPS_ISA
349    virtual MiscReg readRegOtherThread(const RegId& reg,
350                                       ThreadID tid = InvalidThreadID) = 0;
351    virtual void setRegOtherThread(const RegId& reg, MiscReg val,
352                                   ThreadID tid = InvalidThreadID) = 0;
353#endif
354
355    /** @} */
356};
357
358#endif // __CPU_EXEC_CONTEXT_HH__
359