priv.isa revision 2488 
1////////////////////////////////////////////////////////////////////
2//
3// Privilege mode instructions
4//
5
6output header {{
7        /**
8         * Base class for privelege mode operations.
9         */
10        class Priv : public SparcStaticInst
11        {
12          protected:
13            // Constructor
14            Priv(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
15                SparcStaticInst(mnem, _machInst, __opClass)
16            {
17            }
18
19            std::string generateDisassembly(Addr pc,
20                    const SymbolTable *symtab) const;
21        };
22
23        /**
24         * Base class for user mode "tick" access.
25         */
26        class PrivTick : public SparcStaticInst
27        {
28          protected:
29            // Constructor
30            PrivTick(const char *mnem, ExtMachInst _machInst,
31                    OpClass __opClass) :
32                SparcStaticInst(mnem, _machInst, __opClass)
33            {
34            }
35
36            std::string generateDisassembly(Addr pc,
37                    const SymbolTable *symtab) const;
38        };
39
40        /**
41         * Base class for privelege mode operations with immediates.
42         */
43        class PrivImm : public Priv
44        {
45          protected:
46            // Constructor
47            PrivImm(const char *mnem, ExtMachInst _machInst,
48                    OpClass __opClass) :
49                Priv(mnem, _machInst, __opClass), imm(SIMM13)
50            {
51            }
52
53            uint32_t imm;
54        };
55
56        /**
57         * Base class for user mode "tick" access with immediates.
58         */
59        class PrivTickImm : public PrivTick
60        {
61          protected:
62            // Constructor
63            PrivTickImm(const char *mnem, ExtMachInst _machInst,
64                    OpClass __opClass) :
65                PrivTick(mnem, _machInst, __opClass), imm(SIMM13)
66            {
67            }
68
69            uint32_t imm;
70        };
71}};
72
73output decoder {{
74        std::string Priv::generateDisassembly(Addr pc,
75                const SymbolTable *symtab) const
76        {
77                return "Privileged Instruction";
78        }
79
80        std::string PrivTick::generateDisassembly(Addr pc,
81                const SymbolTable *symtab) const
82        {
83                return "Regular access to Tick";
84        }
85}};
86
87def template PrivExecute {{
88    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
89            Trace::InstRecord *traceData) const
90    {
91        %(op_decl)s;
92        %(op_rd)s;
93
94        //Since these are processed inside templates and not in codeblocks,
95        //They aren't translated by the isa_parser. Their names begin with
96        //underscores so they don't cause conflicts.
97        uint32_t _PstatePriv = xc->readMiscReg(MISCREG_PSTATE_PRIV);
98
99        //If the processor isn't in privileged mode, fault out right away
100        if(!_PstatePriv)
101            return new PrivilegedOpcode;
102
103        %(code)s;
104        %(op_wb)s;
105        return NoFault;
106    }
107}};
108
109def template PrivTickExecute {{
110    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
111            Trace::InstRecord *traceData) const
112    {
113        %(op_decl)s;
114        %(op_rd)s;
115
116        //Since these are processed inside templates and not in codeblocks,
117        //They aren't translated by the isa_parser. Their names begin with
118        //underscores so they don't cause conflicts.
119        uint32_t _PstatePriv = xc->readMiscReg(MISCREG_PSTATE_PRIV);
120        uint32_t _TickNpt = xc->readMiscReg(MISCREG_TICK_NPT);
121        //If the processor isn't in privileged mode, fault out right away
122        if(!_PstatePriv && _TickNpt)
123            return new PrivilegedAction;
124
125        %(code)s;
126        %(op_wb)s;
127        return NoFault;
128    }
129}};
130
131// Primary format for integer operate instructions:
132def format Priv(code, *opt_flags) {{
133        uses_imm = (code.find('Rs2_or_imm13') != -1)
134        if uses_imm:
135            orig_code = code
136            code = re.sub(r'Rs2_or_imm13', 'Rs2', orig_code)
137            imm_code = re.sub(r'Rs2_or_imm13(\.\w+)?', 'imm', orig_code)
138        cblk = CodeBlock(code)
139        iop = InstObjParams(name, Name, 'Priv', cblk, opt_flags)
140        header_output = BasicDeclare.subst(iop)
141        decoder_output = BasicConstructor.subst(iop)
142        exec_output = PrivExecute.subst(iop)
143        if uses_imm:
144            imm_cblk = CodeBlock(imm_code)
145            imm_iop = InstObjParams(name, Name + 'Imm', 'PrivImm', imm_cblk,
146                                    opt_flags)
147            header_output += BasicDeclare.subst(imm_iop)
148            decoder_output += BasicConstructor.subst(imm_iop)
149            exec_output += PrivExecute.subst(imm_iop)
150            decode_block = ROrImmDecode.subst(iop)
151        else:
152            decode_block = BasicDecode.subst(iop)
153}};
154
155// Primary format for integer operate instructions:
156def format PrivTick(code, *opt_flags) {{
157        uses_imm = (code.find('Rs2_or_imm13') != -1)
158        if uses_imm:
159            orig_code = code
160            code = re.sub(r'Rs2_or_imm13', 'Rs2', orig_code)
161            imm_code = re.sub(r'Rs2_or_imm13(\.\w+)?', 'imm', orig_code)
162        cblk = CodeBlock(code)
163        iop = InstObjParams(name, Name, 'PrivTick', cblk, opt_flags)
164        header_output = BasicDeclare.subst(iop)
165        decoder_output = BasicConstructor.subst(iop)
166        exec_output = PrivTickExecute.subst(iop)
167        if uses_imm:
168            imm_cblk = CodeBlock(imm_code)
169            imm_iop = InstObjParams(name, Name + 'Imm', 'PrivTickImm', imm_cblk,
170                                    opt_flags)
171            header_output += BasicDeclare.subst(imm_iop)
172            decoder_output += BasicConstructor.subst(imm_iop)
173            exec_output += PrivTickExecute.subst(imm_iop)
174            decode_block = Rb2OrImmDecode.subst(iop)
175        else:
176            decode_block = BasicDecode.subst(iop)
177}};
178