1// -*- mode:c++ -*-
2
3// Copyright (c) 2007 MIPS Technologies, Inc.
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

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84 disp(OFFSET << 2)
85 {
86 //If Bit 17 is 1 then Sign Extend
87 if ( (disp & 0x00020000) > 0 ) {
88 disp |= 0xFFFE0000;
89 }
90 }
91
92 Addr branchTarget(Addr branchPC) const;
93
94 std::string
95 generateDisassembly(Addr pc, const SymbolTable *symtab) const;
96 };
97
98 /**
99 * Base class for jumps (register-indirect control transfers). In
100 * the Mips ISA, these are always unconditional.

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111 public:
112 /// Constructor
113 Jump(const char *mnem, MachInst _machInst, OpClass __opClass)
114 : PCDependentDisassembly(mnem, _machInst, __opClass),
115 disp(JMPTARG << 2)
116 {
117 }
118
119 Addr branchTarget(ThreadContext *tc) const;
120
121 std::string
122 generateDisassembly(Addr pc, const SymbolTable *symtab) const;
123 };
124}};
125
126output decoder {{
127 Addr
128 Branch::branchTarget(Addr branchPC) const
129 {
130 return branchPC + 4 + disp;
131 }
132
133 Addr
134 Jump::branchTarget(ThreadContext *tc) const
135 {
136 Addr NPC = tc->readNextPC();
137 return (NPC & 0xF0000000) | (disp);
138 }
139
140 const std::string &
141 PCDependentDisassembly::disassemble(Addr pc,
142 const SymbolTable *symtab) const
143 {
144 if (!cachedDisassembly ||
145 pc != cachedPC || symtab != cachedSymtab)

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212 printReg(ss, _srcRegIdx[1]);
213 }
214
215 return ss.str();
216 }
217}};
218
219def format Branch(code, *opt_flags) {{
220 not_taken_code = ' NNPC = NNPC;\n'
221 not_taken_code += '} \n'
222
223 #Build Instruction Flags
224 #Use Link & Likely Flags to Add Link/Condition Code
225 inst_flags = ('IsDirectControl', )
226 for x in opt_flags:
227 if x == 'Link':
228 code += 'R31 = NNPC;\n'
229 elif x == 'Likely':
230 not_taken_code = ' NPC = NNPC;\n'
231 not_taken_code += ' NNPC = NNPC + 4;\n'
232 not_taken_code += '} \n'
233 inst_flags += ('IsCondDelaySlot', )
234 else:
235 inst_flags += (x, )
236
237 #Take into account uncond. branch instruction
238 if 'cond = 1' in code:
239 inst_flags += ('IsUncondControl', )
240 else:
241 inst_flags += ('IsCondControl', )
242
243 #Condition code
244 code = 'bool cond;\n' + code
245 code += 'if (cond) {\n'
246 code += ' NNPC = NPC + disp;\n'
247 code += '} else {\n'
248 code += not_taken_code
249
250 iop = InstObjParams(name, Name, 'Branch', code, inst_flags)
251 header_output = BasicDeclare.subst(iop)
252 decoder_output = BasicConstructor.subst(iop)
253 decode_block = BasicDecode.subst(iop)
254 exec_output = BasicExecute.subst(iop)
255}};
256
257def format DspBranch(code, *opt_flags) {{
258 not_taken_code = ' NNPC = NNPC;\n'
259 not_taken_code += '} \n'
260
261 #Build Instruction Flags
262 #Use Link & Likely Flags to Add Link/Condition Code
263 inst_flags = ('IsDirectControl', )
264 for x in opt_flags:
265 if x == 'Link':
266 code += 'R31 = NNPC;\n'
267 elif x == 'Likely':
268 not_taken_code = ' NPC = NNPC;\n'
269 not_taken_code += ' NNPC = NNPC + 4;\n'
270 not_taken_code += '} \n'
271 inst_flags += ('IsCondDelaySlot', )
272 else:
273 inst_flags += (x, )
274
275 #Take into account uncond. branch instruction
276 if 'cond = 1' in code:
277 inst_flags += ('IsUncondControl', )
278 else:
279 inst_flags += ('IsCondControl', )
280
281 #Declaration code
282 decl_code = 'bool cond;\n'
283 decl_code += 'uint32_t dspctl;\n'
284
285 #Fetch code
286 fetch_code = 'dspctl = DSPControl;\n'
287
288 #Condition code
289 code = decl_code + fetch_code + code
290 code += 'if (cond) {\n'
291 code += ' NNPC = NPC + disp;\n'
292 code += '} else {\n'
293 code += not_taken_code
294
295 iop = InstObjParams(name, Name, 'Branch', code, inst_flags)
296 header_output = BasicDeclare.subst(iop)
297 decoder_output = BasicConstructor.subst(iop)
298 decode_block = BasicDecode.subst(iop)
299 exec_output = BasicExecute.subst(iop)
300}};
301
302def format Jump(code, *opt_flags) {{
303 #Build Instruction Flags
304 #Use Link Flag to Add Link Code
305 inst_flags = ('IsIndirectControl', 'IsUncondControl')
306 for x in opt_flags:
307 if x == 'Link':
308 code = 'R31 = NNPC;\n' + code
309 elif x == 'ClearHazards':
310 code += '/* Code Needed to Clear Execute & Inst Hazards */\n'
311 else:
312 inst_flags += (x, )
313
314 iop = InstObjParams(name, Name, 'Jump', code, inst_flags)
315 header_output = BasicDeclare.subst(iop)
316 decoder_output = BasicConstructor.subst(iop)
317 decode_block = BasicDecode.subst(iop)
318 exec_output = BasicExecute.subst(iop)
319}};
320
321
322
323