Motorola M68000 User Manual Page 247
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Supervisor (Privileged) Instructions
6-84 M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL MOTOROLA
RTE Return from Exception RTE
(M68000 Family)
Operation: If Supervisor State
Then (SP) → SR; SP + 2 → SP; (SP) → PC; SP + 4 → SP; Restore
State and Deallocate Stack According to (SP)
Else TRAP
Assembler
Syntax: RTE
Attributes: Unsized
Description: Loads the processor state information stored in the exception stack frame
located at the top of the stack into the processor. The instruction examines the stack
format field in the format/offset word to determine how much information must be
restored.
Condition Codes:
Set according to the condition code bits in the status register value restored from the
stack.
Instruction Format:
Format/Offset Word (in Stack Frame):
MC68010, MC68020, MC68030, MC68040, CPU32
Format Field of Format/Offset Word:
Contains the format code, which implies the stack frame size (including the format/
offset word). For further information, refer to Appendix B Exception Processing
Reference.
1514131211109876543210
0100111001110011
1514131211109876543210
FORMAT 0 0 VECTOR OFFSET
- MOTOROLA 1
- M68000 FAMILY 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 8
- LIST OF FIGURES (Concluded) 9
- LIST OF TABLES 10
- LIST OF TABLES (Continued) 11
- SECTION 5 12
- FLOATING POINT INSTRUCTIONS 12
- Floating-Point Absolute Value 15
- Arc Cosine 19
- Floating-Point Add 22
- FADD Floating-Point Add FADD 23
- FASIN Arc Sine FASIN 25
- FATAN Arc Tangent FATAN 28
- Floating-Point Compare FCMP 36
- FCOS Cosine FCOS 39
- FCOSH Hyperbolic Cosine FCOSH 42
- Hyperbolic Cosine FCOSH 43
- Hyperbolic Cosine FCOSH 44
- Decrement, and Branch 45
- Floating-Point Divide FDIV 47
- FETOXM1 e 54
- FGETEXP Get Exponent FGETEXP 57
- FGETMAN Get Mantissa FGETMAN 60
- FINT Integer Part FINT 63
- FLOG10 Log 69
- FLOG2 Log 72
- FLOGN Log 75
- FLOGNP1 Log 78
- FMOD Modulo Remainder FMOD 81
- ⋅), but all 84
- < EA > TO REGISTER 86
- REGISTER—TO-MEMORY 89
- Move Floating-Point FMOVE 91
- System Control Register 91
- Move Constant ROM FMOVECR 94
- Data Registers 100
- Control Registers 102
- Floating-Point Multiply FMUL 105
- Floating-Point Negate FNEG 109
- FNOP No Operation FNOP 113
- FREM IEEE Remainder FREM 115
- FSCALE Scale Exponent FSCALE 118
- Floating Point Instructions 121
- FSIN Sine FSIN 129
- FSINH Hyperbolic Sine FSINH 136
- Floating-Point Subtract FSUB 143
- FTAN Tangent FTAN 147
- Hyperbolic Tangent FTANH 150
- FTENTOX 10 153
- FTENTOX 153
- DESTINATION 158
- FTWOTOX 2 161
- FTWOTOX 161
- SECTION 6 164
- ANDI ANDI 165
- Invalidate Cache Lines 166
- Coprocessor 168
- Restore Functions 168
- Coprocessor Save Function 170
- 1514131211109876543210 171
- EORI EORI 173
- Restore Internal FRESTORE 174
- Floating-Point State 174
- MOVE MOVE 180
- Move Control Register MOVEC 185
- Move Address Space MOVES 187
- ORI ORI 190
- 1111000001001COUNT REGISTER 194
- 0000000000 MC68851 CONDITION 194
- 16-BIT DISPLACEMENT 194
- 1111000000 196
- EFFECTIVE ADDRESS 196
- MODE REGISTER 196
- 0 0 1 MODE 0 0 MASK FC 196
- Flush ATC Entries PFLUSH 198
- PFLUSH PFLUSH 201
- PFLUSHA PFLUSHA 201
- 1010000000000000 204
- 001000R/ W0000 FC 207
- SRP, CRP, and TC Registers 211
- MMU Status Register 212
- TT Registers 213
- 011000R/W000000000 214
- ACx Registers 215
- Move PMMU Register PMOVE 216
- 1111000101 221
- PMMU Save Function PSAVE 222
- Set on PMMU Condition PScc 225
- Test a Logical Address PTEST 226
- (MC68030 only) 228
- 1111000001111 OPMODE 242
- Validate a Pointer PVALID 243
- Reset External Devices RESET 246
- Return from Exception RTE 247
- 0100111001110010 248
- IMMEDIATE DATA 248
- SECTION 7 250
- CPU32 INSTRUCTIONS 250
- Enter Background Mode 253
- (CPU32) 253
- Low-Power Stop 254
- TBLS TBLS 255
- TBLU TBLU 260
- CPU32 Instructions 265
- SECTION 8 266
- INSTRUCTION FORMAT SUMMARY 266
- Instruction Format Summary 286
- X AND BACX REGISTERS 290
- TBLU, TBLUN 293
- TBLS, TBLSN 293
- DATA REGISTER INTERPOLATE 294
- FLOGNP1 295
- FETOXM1 295
- FRESTORE 303
- FTRAPcc 303
- APPENDIX A 306
- PROCESSOR INSTRUCTION SUMMARY 306
- Processor Instruction Summary 317
- Mnemonic Description 317
- (Continued) 318
- Data Addressing Modes 321
- A.2 MC68020 PROCESSORS 322
- (Concluded) 324
- Addressing Modes Syntax 325
- A.3 MC68030 PROCESSORS 326
- A.4 MC68040 PROCESSORS 330
- A.6 MC68851 COPROCESSORS 336
- APPENDIX B 338
- Assignment 339
- B.2 EXCEPTION STACK FRAMES 340
- Frame, Format $4 342
- Format $9 343
- 15 031 24 23 16 349
- VERSION $41 349
- (RESERVED) 349
- APPENDIX C 352
- S-RECORD OUTPUT FORMAT 352
- C.2 S-RECORD TYPES 353
- C.3 S-RECORD CREATION 354
- Table C-2. ASCII Code 356
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