pal.isa revision 6181 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2003-2005 The Regents of The University of Michigan
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: Steve Reinhardt
30
31////////////////////////////////////////////////////////////////////
32//
33// PAL calls & PAL-specific instructions
34//
35
36output header {{
37    /**
38     * Base class for emulated call_pal calls (used only in
39     * non-full-system mode).
40     */
41    class EmulatedCallPal : public AlphaStaticInst
42    {
43      protected:
44
45        /// Constructor.
46        EmulatedCallPal(const char *mnem, ExtMachInst _machInst,
47                        OpClass __opClass)
48            : AlphaStaticInst(mnem, _machInst, __opClass)
49        {
50        }
51
52        std::string
53        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
54    };
55}};
56
57output decoder {{
58    std::string
59    EmulatedCallPal::generateDisassembly(Addr pc,
60                                         const SymbolTable *symtab) const
61    {
62#ifdef SS_COMPATIBLE_DISASSEMBLY
63        return csprintf("%s %s", "call_pal", mnemonic);
64#else
65        return csprintf("%-10s %s", "call_pal", mnemonic);
66#endif
67    }
68}};
69
70def format EmulatedCallPal(code, *flags) {{
71    iop = InstObjParams(name, Name, 'EmulatedCallPal', code, flags)
72    header_output = BasicDeclare.subst(iop)
73    decoder_output = BasicConstructor.subst(iop)
74    decode_block = BasicDecode.subst(iop)
75    exec_output = BasicExecute.subst(iop)
76}};
77
78output header {{
79    /**
80     * Base class for full-system-mode call_pal instructions.
81     * Probably could turn this into a leaf class and get rid of the
82     * parser template.
83     */
84    class CallPalBase : public AlphaStaticInst
85    {
86      protected:
87        int palFunc;	///< Function code part of instruction
88        int palOffset;	///< Target PC, offset from IPR_PAL_BASE
89        bool palValid;	///< is the function code valid?
90        bool palPriv;	///< is this call privileged?
91
92        /// Constructor.
93        CallPalBase(const char *mnem, ExtMachInst _machInst,
94                    OpClass __opClass);
95
96        std::string
97        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
98    };
99}};
100
101output decoder {{
102    inline
103    CallPalBase::CallPalBase(const char *mnem, ExtMachInst _machInst,
104                             OpClass __opClass)
105        : AlphaStaticInst(mnem, _machInst, __opClass),
106        palFunc(PALFUNC)
107    {
108        // From the 21164 HRM (paraphrased):
109        // Bit 7 of the function code (mask 0x80) indicates
110        // whether the call is privileged (bit 7 == 0) or
111        // unprivileged (bit 7 == 1).  The privileged call table
112        // starts at 0x2000, the unprivielged call table starts at
113        // 0x3000.  Bits 5-0 (mask 0x3f) are used to calculate the
114        // offset.
115        const int palPrivMask = 0x80;
116        const int palOffsetMask = 0x3f;
117
118        // Pal call is invalid unless all other bits are 0
119        palValid = ((machInst & ~(palPrivMask | palOffsetMask)) == 0);
120        palPriv = ((machInst & palPrivMask) == 0);
121        int shortPalFunc = (machInst & palOffsetMask);
122        // Add 1 to base to set pal-mode bit
123        palOffset = (palPriv ? 0x2001 : 0x3001) + (shortPalFunc << 6);
124    }
125
126    std::string
127    CallPalBase::generateDisassembly(Addr pc, const SymbolTable *symtab) const
128    {
129        return csprintf("%-10s %#x", "call_pal", palFunc);
130    }
131}};
132
133def format CallPal(code, *flags) {{
134    iop = InstObjParams(name, Name, 'CallPalBase', code, flags)
135    header_output = BasicDeclare.subst(iop)
136    decoder_output = BasicConstructor.subst(iop)
137    decode_block = BasicDecode.subst(iop)
138    exec_output = BasicExecute.subst(iop)
139}};
140
141////////////////////////////////////////////////////////////////////
142//
143// hw_ld, hw_st
144//
145
146output header {{
147    /**
148     * Base class for hw_ld and hw_st.
149     */
150    class HwLoadStore : public Memory
151    {
152      protected:
153
154        /// Displacement for EA calculation (signed).
155        int16_t disp;
156
157        /// Constructor
158        HwLoadStore(const char *mnem, ExtMachInst _machInst, OpClass __opClass);
159
160        std::string
161        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
162    };
163}};
164
165
166output decoder {{
167    inline
168    HwLoadStore::HwLoadStore(const char *mnem, ExtMachInst _machInst,
169                             OpClass __opClass)
170        : Memory(mnem, _machInst, __opClass), disp(HW_LDST_DISP)
171    {
172        memAccessFlags.clear();
173        if (HW_LDST_PHYS) memAccessFlags.set(Request::PHYSICAL);
174        if (HW_LDST_ALT)  memAccessFlags.set(Request::ALTMODE);
175        if (HW_LDST_VPTE) memAccessFlags.set(Request::VPTE);
176        if (HW_LDST_LOCK) memAccessFlags.set(Request::LLSC);
177    }
178
179    std::string
180    HwLoadStore::generateDisassembly(Addr pc, const SymbolTable *symtab) const
181    {
182#ifdef SS_COMPATIBLE_DISASSEMBLY
183        return csprintf("%-10s r%d,%d(r%d)", mnemonic, RA, disp, RB);
184#else
185        // HW_LDST_LOCK and HW_LDST_COND are the same bit.
186        const char *lock_str =
187            (HW_LDST_LOCK) ? (flags[IsLoad] ? ",LOCK" : ",COND") : "";
188
189        return csprintf("%-10s r%d,%d(r%d)%s%s%s%s%s",
190                        mnemonic, RA, disp, RB,
191                        HW_LDST_PHYS ? ",PHYS" : "",
192                        HW_LDST_ALT ? ",ALT" : "",
193                        HW_LDST_QUAD ? ",QUAD" : "",
194                        HW_LDST_VPTE ? ",VPTE" : "",
195                        lock_str);
196#endif
197    }
198}};
199
200def format HwLoad(ea_code, memacc_code, class_ext, *flags) {{
201    (header_output, decoder_output, decode_block, exec_output) = \
202        LoadStoreBase(name, Name + class_ext, ea_code, memacc_code,
203                      mem_flags = [], inst_flags = flags,
204                      base_class = 'HwLoadStore', exec_template_base = 'Load')
205}};
206
207
208def format HwStore(ea_code, memacc_code, class_ext, *flags) {{
209    (header_output, decoder_output, decode_block, exec_output) = \
210        LoadStoreBase(name, Name + class_ext, ea_code, memacc_code,
211                      mem_flags = [], inst_flags = flags,
212                      base_class = 'HwLoadStore', exec_template_base = 'Store')
213}};
214
215
216def format HwStoreCond(ea_code, memacc_code, postacc_code, class_ext,
217                       *flags) {{
218    (header_output, decoder_output, decode_block, exec_output) = \
219        LoadStoreBase(name, Name + class_ext, ea_code, memacc_code,
220                      postacc_code, mem_flags = [], inst_flags = flags,
221                      base_class = 'HwLoadStore')
222}};
223
224
225output header {{
226    /**
227     * Base class for hw_mfpr and hw_mtpr.
228     */
229    class HwMoveIPR : public AlphaStaticInst
230    {
231      protected:
232        /// Index of internal processor register.
233        int ipr_index;
234
235        /// Constructor
236        HwMoveIPR(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
237            : AlphaStaticInst(mnem, _machInst, __opClass),
238              ipr_index(HW_IPR_IDX)
239        {
240        }
241
242        std::string
243        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
244    };
245}};
246
247output decoder {{
248    std::string
249    HwMoveIPR::generateDisassembly(Addr pc, const SymbolTable *symtab) const
250    {
251        if (_numSrcRegs > 0) {
252            // must be mtpr
253            return csprintf("%-10s r%d,IPR(%#x)",
254                            mnemonic, RA, ipr_index);
255        }
256        else {
257            // must be mfpr
258            return csprintf("%-10s IPR(%#x),r%d",
259                            mnemonic, ipr_index, RA);
260        }
261    }
262}};
263
264def format HwMoveIPR(code, *flags) {{
265    all_flags = ['IprAccessOp']
266    all_flags += flags
267    iop = InstObjParams(name, Name, 'HwMoveIPR', code, all_flags)
268    header_output = BasicDeclare.subst(iop)
269    decoder_output = BasicConstructor.subst(iop)
270    decode_block = BasicDecode.subst(iop)
271    exec_output = BasicExecute.subst(iop)
272}};
273
274
275