mem.isa revision 7131:ab3a70a37ca8 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2010 ARM Limited
4// All rights reserved
5//
6// The license below extends only to copyright in the software and shall
7// not be construed as granting a license to any other intellectual
8// property including but not limited to intellectual property relating
9// to a hardware implementation of the functionality of the software
10// licensed hereunder.  You may use the software subject to the license
11// terms below provided that you ensure that this notice is replicated
12// unmodified and in its entirety in all distributions of the software,
13// modified or unmodified, in source code or in binary form.
14//
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: Gabe Black
42
43def format AddrMode2(imm) {{
44    if eval(imm):
45        imm = True
46    else:
47        imm = False
48
49    def buildPUBWLCase(p, u, b, w, l):
50        return (p << 4) + (u << 3) + (b << 2) + (w << 1) + (l << 0)
51
52    header_output = decoder_output = exec_output = ""
53    decode_block = "switch(PUBWL) {\n"
54
55    # Loop over all the values of p, u, b, w and l and build instructions and
56    # a decode block for them.
57    for p in (0, 1):
58        for u in (0, 1):
59            for b in (0, 1):
60                for w in (0, 1):
61                    post = (p == 0)
62                    user = (p == 0 and w == 1)
63                    writeback = (p == 0 or w == 1)
64                    add = (u == 1)
65                    if b == 0:
66                        size = 4
67                    else:
68                        size = 1
69                    if add:
70                        addStr = "true"
71                    else:
72                        addStr = "false"
73                    if imm:
74                        newDecode = "return new %s(machInst, RD, RN," + \
75                                                  "%s, machInst.immed11_0);"
76                        loadClass = loadImmClassName(post, add, writeback,
77                                                     size, False, user)
78                        storeClass = storeImmClassName(post, add, writeback,
79                                                       size, False, user)
80                        loadDecode = newDecode % (loadClass, addStr)
81                        storeDecode = newDecode % (storeClass, addStr)
82                    else:
83                        newDecode = "return new %s(machInst, RD, RN, %s," + \
84                                                  "machInst.shiftSize," + \
85                                                  "machInst.shift, RM);"
86                        loadClass = loadRegClassName(post, add, writeback,
87                                                     size, False, user)
88                        storeClass = storeRegClassName(post, add, writeback,
89                                                       size, False, user)
90                        loadDecode = newDecode % (loadClass, addStr)
91                        storeDecode = newDecode % (storeClass, addStr)
92                    decode = '''
93                        case %#x:
94                          {%s}
95                          break;
96                    '''
97                    decode_block += decode % \
98                        (buildPUBWLCase(p,u,b,w,1), loadDecode)
99                    decode_block += decode % \
100                        (buildPUBWLCase(p,u,b,w,0), storeDecode)
101    decode_block += '''
102        default:
103          return new Unknown(machInst);
104        break;
105    }'''
106}};
107
108def format AddrMode3() {{
109    decode = '''
110    {
111        const uint32_t op1 = bits(machInst, 24, 20);
112        const uint32_t op2 = bits(machInst, 6, 5);
113        const uint32_t puiw = bits(machInst, 24, 21);
114        const uint32_t imm = IMMED_HI_11_8 << 4 | IMMED_LO_3_0;
115        switch (op2) {
116          case 0x1:
117            if (op1 & 0x1) {
118                %(ldrh)s
119            } else {
120                %(strh)s
121            }
122          case 0x2:
123            if (op1 & 0x1) {
124                %(ldrsb)s
125            } else {
126                %(ldrd)s
127            }
128          case 0x3:
129            if (op1 & 0x1) {
130                %(ldrsh)s
131            } else {
132                %(strd)s
133            }
134          default:
135            return new Unknown(machInst);
136        }
137    }
138    '''
139
140    def decodePuiwCase(load, d, p, u, i, w, size=4, sign=False):
141        post = (p == 0)
142        user = (p == 0 and w == 1)
143        writeback = (p == 0 or w == 1)
144        add = (u == 1)
145        caseVal = (p << 3) + (u << 2) + (i << 1) + (w << 0)
146        decode = '''
147          case %#x:
148            return new '''% caseVal
149        if add:
150            addStr = "true"
151        else:
152            addStr = "false"
153        if i:
154            if load:
155                if d:
156                    className = loadDoubleImmClassName(post, add, writeback)
157                else:
158                    className = loadImmClassName(post, add, writeback, \
159                                                 size=size, sign=sign, \
160                                                 user=user)
161            else:
162                if d:
163                    className = storeDoubleImmClassName(post, add, writeback)
164                else:
165                    className = storeImmClassName(post, add, writeback, \
166                                                  size=size, sign=sign, \
167                                                  user=user)
168            decode += ("%s(machInst, RT, RN, %s, imm);\n" % \
169                       (className, addStr))
170        else:
171            if load:
172                if d:
173                    className = loadDoubleRegClassName(post, add, writeback)
174                else:
175                    className = loadRegClassName(post, add, writeback, \
176                                                 size=size, sign=sign, \
177                                                 user=user)
178            else:
179                if d:
180                    className = storeDoubleRegClassName(post, add, writeback)
181                else:
182                    className = storeRegClassName(post, add, writeback, \
183                                                  size=size, sign=sign, \
184                                                  user=user)
185            decode += ("%s(machInst, RT, RN, %s, 0, LSL, RM);\n" % \
186                       (className, addStr))
187        return decode
188
189    def decodePuiw(load, d, size=4, sign=False):
190        global decodePuiwCase
191        decode = "switch (puiw) {\n"
192        for p in (0, 1):
193            for u in (0, 1):
194                for i in (0, 1):
195                    for w in (0, 1):
196                        decode += decodePuiwCase(load, d, p, u, i, w,
197                                                 size, sign)
198        decode += '''
199          default:
200            return new Unknown(machInst);
201        }
202        '''
203        return decode
204
205    subs = {
206        "ldrh" : decodePuiw(True, False, size=2),
207        "strh" : decodePuiw(False, False, size=2),
208        "ldrsb" : decodePuiw(True, False, size=1, sign=True),
209        "ldrd" : decodePuiw(True, True),
210        "ldrsh" : decodePuiw(True, False, size=2, sign=True),
211        "strd" : decodePuiw(False, True)
212    }
213    decode_block = decode % subs
214}};
215
216def format Thumb32LoadWord() {{
217    decode = '''
218    {
219        uint32_t op1 = bits(machInst, 24, 23);
220        if (bits(op1, 1) == 0) {
221            uint32_t op2 = bits(machInst, 11, 6);
222            if (HTRN == 0xF) {
223                if (UP) {
224                    return new %(literal_u)s(machInst, RT, INTREG_PC,
225                                             true, IMMED_11_0);
226                } else {
227                    return new %(literal)s(machInst, RT, INTREG_PC,
228                                           false, IMMED_11_0);
229                }
230            } else if (op1 == 0x1) {
231                return new %(imm_pu)s(machInst, RT, RN, true, IMMED_11_0);
232            } else if (op2 == 0) {
233                return new %(register)s(machInst, RT, RN, UP,
234                                        bits(machInst, 5, 4), LSL, RM);
235            } else if ((op2 & 0x3c) == 0x38) {
236                return new %(ldrt)s(machInst, RT, RN, true, IMMED_7_0);
237            } else if ((op2 & 0x3c) == 0x30 || //P
238                       (op2 & 0x24) == 0x24) { //W
239                uint32_t puw = bits(machInst, 10, 8);
240                uint32_t imm = IMMED_7_0;
241                switch (puw) {
242                  case 0:
243                  case 2:
244                    // If we're here, either P or W must have been set.
245                    panic("Neither P or W set, but that "
246                            "shouldn't be possible.\\n");
247                  case 1:
248                    return new %(imm_w)s(machInst, RT, RN, false, imm);
249                  case 3:
250                    return new %(imm_uw)s(machInst, RT, RN, true, imm);
251                  case 4:
252                    return new %(imm_p)s(machInst, RT, RN, false, imm);
253                  case 5:
254                    return new %(imm_pw)s(machInst, RT, RN, false, imm);
255                  case 6:
256                    return new %(imm_pu)s(machInst, RT, RN, true, imm);
257                  case 7:
258                    return new %(imm_puw)s(machInst, RT, RN, true, imm);
259                }
260            }
261        } else {
262            return new Unknown(machInst);
263        }
264    }
265    '''
266    classNames = {
267        "literal_u" : loadImmClassName(False, True, False),
268        "literal" : loadImmClassName(False, False, False),
269        "register" : loadRegClassName(False, True, False),
270        "ldrt" : loadImmClassName(False, True, False, user=True),
271        "imm_w" : loadImmClassName(True, False, True),
272        "imm_uw" : loadImmClassName(True, True, True),
273        "imm_p" : loadImmClassName(False, False, False),
274        "imm_pw" : loadImmClassName(False, False, True),
275        "imm_pu" : loadImmClassName(False, True, False),
276        "imm_puw" : loadImmClassName(False, True, True)
277    }
278    decode_block = decode % classNames
279}};
280
281def format Thumb32StoreSingle() {{
282    def buildPuwDecode(size):
283        puwDecode = '''
284                {
285                    uint32_t puw = bits(machInst, 10, 8);
286                    uint32_t imm = IMMED_7_0;
287                    switch (puw) {
288                      case 0:
289                      case 2:
290                        // If we're here, either P or W must have been set.
291                        panic("Neither P or W set, but that "
292                                "shouldn't be possible.\\n");
293                      case 1:
294                        return new %(imm_w)s(machInst, RT, RN, false, imm);
295                      case 3:
296                        return new %(imm_uw)s(machInst, RT, RN, true, imm);
297                      case 4:
298                        return new %(imm_p)s(machInst, RT, RN, false, imm);
299                      case 5:
300                        return new %(imm_pw)s(machInst, RT, RN, false, imm);
301                      case 6:
302                        return new %(imm_pu)s(machInst, RT, RN, true, imm);
303                      case 7:
304                        return new %(imm_puw)s(machInst, RT, RN, true, imm);
305                    }
306                }
307        '''
308        return puwDecode % {
309            "imm_w" : storeImmClassName(True, False, True, size=size),
310            "imm_uw" : storeImmClassName(True, True, True, size=size),
311            "imm_p" : storeImmClassName(False, False, False, size=size),
312            "imm_pw" : storeImmClassName(False, False, True, size=size),
313            "imm_pu" : storeImmClassName(False, True, False, size=size),
314            "imm_puw" : storeImmClassName(False, True, True, size=size)
315        }
316    decode = '''
317    {
318        uint32_t op1 = bits(machInst, 23, 21);
319        uint32_t op2 = bits(machInst, 11, 6);
320        bool op2Puw = ((op2 & 0x24) == 0x24 ||
321                       (op2 & 0x3c) == 0x30);
322        if (op1 == 4) {
323            return new %(strb_imm)s(machInst, RT, RN, true, IMMED_11_0);
324        } else if (op1 == 0 && op2Puw) {
325            %(strb_puw)s;
326        } else if (op1 == 0 && ((op2 & 0x3c) == 0x38)) {
327            return new %(strbt)s(machInst, RT, RN, true, IMMED_7_0);
328        } else if (op1 == 0 && op2 == 0) {
329            return new %(strb_reg)s(machInst, RT, RN, true,
330                                    bits(machInst, 5, 4), LSL, RM);
331        } else if (op1 == 5) {
332            return new %(strh_imm)s(machInst, RT, RN, true, IMMED_11_0);
333        } else if (op1 == 1 && op2Puw) {
334            %(strh_puw)s;
335        } else if (op1 == 1 && ((op2 & 0x3c) == 0x38)) {
336            return new %(strht)s(machInst, RT, RN, true, IMMED_7_0);
337        } else if (op1 == 1 && op2 == 0) {
338            return new %(strh_reg)s(machInst, RT, RN, true,
339                                    bits(machInst, 5, 4), LSL, RM);
340        } else if (op1 == 6) {
341            return new %(str_imm)s(machInst, RT, RN, true, IMMED_11_0);
342        } else if (op1 == 2 && op2Puw) {
343            %(str_puw)s;
344        } else if (op1 == 2 && ((op2 & 0x3c) == 0x38)) {
345            return new %(strt)s(machInst, RT, RN, true, IMMED_7_0);
346        } else if (op1 == 2 && op2 == 0) {
347            return new %(str_reg)s(machInst, RT, RN, true,
348                                   bits(machInst, 5, 4), LSL, RM);
349        } else {
350            return new Unknown(machInst);
351        }
352    }
353    '''
354    classNames = {
355        "strb_imm" : storeImmClassName(False, True, False, size=1),
356        "strb_puw" : buildPuwDecode(1),
357        "strbt" : storeImmClassName(False, True, False, user=True, size=1),
358        "strb_reg" : storeRegClassName(False, True, False, size=1),
359        "strh_imm" : storeImmClassName(False, True, False, size=2),
360        "strh_puw" : buildPuwDecode(2),
361        "strht" : storeImmClassName(False, True, False, user=True, size=2),
362        "strh_reg" : storeRegClassName(False, True, False, size=2),
363        "str_imm" : storeImmClassName(False, True, False),
364        "str_puw" : buildPuwDecode(4),
365        "strt" : storeImmClassName(False, True, False, user=True),
366        "str_reg" : storeRegClassName(False, True, False)
367    }
368    decode_block = decode % classNames
369}};
370
371def format Thumb16MemReg() {{
372    decode = '''
373    {
374        const uint32_t opb = bits(machInst, 11, 9);
375        const uint32_t rt = bits(machInst, 2, 0);
376        const uint32_t rn = bits(machInst, 5, 3);
377        const uint32_t rm = bits(machInst, 8, 6);
378        switch (opb) {
379          case 0x0:
380            return new %(str)s(machInst, rt, rn, true, 0, LSL, rm);
381          case 0x1:
382            return new %(strh)s(machInst, rt, rn, true, 0, LSL, rm);
383          case 0x2:
384            return new %(strb)s(machInst, rt, rn, true, 0, LSL, rm);
385          case 0x3:
386            return new %(ldrsb)s(machInst, rt, rn, true, 0, LSL, rm);
387          case 0x4:
388            return new %(ldr)s(machInst, rt, rn, true, 0, LSL, rm);
389          case 0x5:
390            return new %(ldrh)s(machInst, rt, rn, true, 0, LSL, rm);
391          case 0x6:
392            return new %(ldrb)s(machInst, rt, rn, true, 0, LSL, rm);
393          case 0x7:
394            return new %(ldrsh)s(machInst, rt, rn, true, 0, LSL, rm);
395        }
396    }
397    '''
398    classNames = {
399        "str" : storeRegClassName(False, True, False),
400        "strh" : storeRegClassName(False, True, False, size=2),
401        "strb" : storeRegClassName(False, True, False, size=1),
402        "ldrsb" : loadRegClassName(False, True, False, sign=True, size=1),
403        "ldr" : loadRegClassName(False, True, False),
404        "ldrh" : loadRegClassName(False, True, False, size=2),
405        "ldrb" : loadRegClassName(False, True, False, size=1),
406        "ldrsh" : loadRegClassName(False, True, False, sign=True, size=2),
407    }
408    decode_block = decode % classNames
409}};
410
411def format Thumb16MemImm() {{
412    decode = '''
413    {
414        const uint32_t opa = bits(machInst, 15, 12);
415        const uint32_t opb = bits(machInst, 11, 9);
416        const uint32_t lrt = bits(machInst, 2, 0);
417        const uint32_t lrn = bits(machInst, 5, 3);
418        const uint32_t hrt = bits(machInst, 10, 8);
419        const uint32_t imm5 = bits(machInst, 10, 6);
420        const uint32_t imm8 = bits(machInst, 7, 0);
421        const bool load = bits(opb, 2);
422        switch (opa) {
423          case 0x6:
424            if (load) {
425                return new %(ldr)s(machInst, lrt, lrn, true, imm5 << 2);
426            } else {
427                return new %(str)s(machInst, lrt, lrn, true, imm5 << 2);
428            }
429          case 0x7:
430            if (load) {
431                return new %(ldrb)s(machInst, lrt, lrn, true, imm5);
432            } else {
433                return new %(strb)s(machInst, lrt, lrn, true, imm5);
434            }
435          case 0x8:
436            if (load) {
437                return new %(ldrh)s(machInst, lrt, lrn, true, imm5 << 1);
438            } else {
439                return new %(strh)s(machInst, lrt, lrn, true, imm5 << 1);
440            }
441          case 0x9:
442            if (load) {
443                return new %(ldr)s(machInst, hrt, INTREG_SP, true, imm8 << 2);
444            } else {
445                return new %(str)s(machInst, hrt, INTREG_SP, true, imm8 << 2);
446            }
447          default:
448            return new Unknown(machInst);
449        }
450    }
451    '''
452    classNames = {
453        "ldr" : loadImmClassName(False, True, False),
454        "str" : storeImmClassName(False, True, False),
455        "ldrh" : loadImmClassName(False, True, False, size=2),
456        "strh" : storeImmClassName(False, True, False, size=2),
457        "ldrb" : loadImmClassName(False, True, False, size=1),
458        "strb" : storeImmClassName(False, True, False, size=1),
459    }
460    decode_block = decode % classNames
461}};
462
463def format Thumb16MemLit() {{
464    decode_block = '''
465    {
466        const uint32_t rt = bits(machInst, 10, 8);
467        const uint32_t imm8 = bits(machInst, 7, 0);
468        return new %s(machInst, rt, INTREG_PC, true, imm8 << 2);
469    }
470    ''' % loadImmClassName(False, True, False)
471}};
472
473