Semiconductor & Computer Engineering
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Difference between revisions of "arm/armv1"
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{{inst|mn=SBC |col 1=SBC<cond>{S} Rd, Rn, #imm |col 2=Subtract with carry immed |col 3 =Rd = Rn - imm - {{l|not|C}}}} | {{inst|mn=SBC |col 1=SBC<cond>{S} Rd, Rn, #imm |col 2=Subtract with carry immed |col 3 =Rd = Rn - imm - {{l|not|C}}}} | ||
{{inst|mn=SBC |col 1=SBC<cond>{S} Rd, Rn, Rm{, <shift>} |col 2=Subtract with carry |col 3 =Rd = Rn - {shifted Rm} - {{l|not|C}}}} | {{inst|mn=SBC |col 1=SBC<cond>{S} Rd, Rn, Rm{, <shift>} |col 2=Subtract with carry |col 3 =Rd = Rn - {shifted Rm} - {{l|not|C}}}} | ||
| + | {{inst|mn=SUB |col 1=SUB<cond>{S} Rd, Rn, #imm |col 2=Subtract immed |col 3 =Rd = Rn - imm}} | ||
| + | {{inst|mn=SUB |col 1=SUB<cond>{S} Rd, Rn, Rm{, <shift>} |col 2=Subtract |col 3 =Rd = Rn - {shifted Rm} }} | ||
{{inst|cols=5|section=<span id="logical_instructions">'''Logical Instructions'''</span>}} | {{inst|cols=5|section=<span id="logical_instructions">'''Logical Instructions'''</span>}} | ||
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{{inst|mn=ORR |col 1=ORR<cond>{S} Rd, Rn, #imm |col 2=Logical OR immed |col 3 =Rd = {{l|lor2|Rn|imm}}}} | {{inst|mn=ORR |col 1=ORR<cond>{S} Rd, Rn, #imm |col 2=Logical OR immed |col 3 =Rd = {{l|lor2|Rn|imm}}}} | ||
{{inst|mn=ORR |col 1=ORR<cond>{S} Rd, Rn, Rm{, <shift>} |col 2=Logical OR |col 3 =Rd = {{l|lor2|Rn|{shifted Rm} }}}} | {{inst|mn=ORR |col 1=ORR<cond>{S} Rd, Rn, Rm{, <shift>} |col 2=Logical OR |col 3 =Rd = {{l|lor2|Rn|{shifted Rm} }}}} | ||
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{{inst|cols=5|section=<span id="comparison_instructions">'''Comparison Instructions'''</span>}} | {{inst|cols=5|section=<span id="comparison_instructions">'''Comparison Instructions'''</span>}} | ||
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{{inst|mn=CMP |col 1=CMP<cond> Rn, #imm |col 2=Compare immed |col 3 =CPSR flags set on (Rn - imm)}} | {{inst|mn=CMP |col 1=CMP<cond> Rn, #imm |col 2=Compare immed |col 3 =CPSR flags set on (Rn - imm)}} | ||
{{inst|mn=CMP |col 1=CMP<cond> Rn, Rm{, <shift>} |col 2=Compare |col 3 =CPSR flags set on (Rn - {shifted Rm})}} | {{inst|mn=CMP |col 1=CMP<cond> Rn, Rm{, <shift>} |col 2=Compare |col 3 =CPSR flags set on (Rn - {shifted Rm})}} | ||
| + | {{inst|mn=TEQ |col 1=TEQ<cond> Rn, #imm |col 2=Test equality immed |col 3 =CPSR flags set on ({{l|xor|Rn|imm}})}} | ||
| + | {{inst|mn=TEQ |col 1=TEQ<cond> Rn, Rm{, <shift>} |col 2=Test equality |col 3 =CPSR flags set on ({{l|xor|Rn|{shifted Rm} }})}} | ||
| + | {{inst|mn=TST |col 1=TST<cond> Rn, #imm |col 2=Test bits immed |col 3 =CPSR flags set on ({{l|land2|Rn|imm}})}} | ||
| + | {{inst|mn=TST |col 1=TST<cond> Rn, Rm{, <shift>} |col 2=Test bits |col 3 =CPSR flags set on ({{l|land2|Rn|{shifted Rm} }})}} | ||
| + | |||
{{inst|cols=5|section=<span id="branch_instructions">'''Branch Instructions'''</span>}} | {{inst|cols=5|section=<span id="branch_instructions">'''Branch Instructions'''</span>}} | ||
| − | {{inst|mn=B |col 1=B<cond> | + | {{inst|mn=B |col 1=B<cond> imm |col 2=Branch relative |col 3 =PC = PC + address}} |
| − | {{inst|mn=BL |col 1=BL<cond> | + | {{inst|mn=BL |col 1=BL<cond> imm |col 2=Branch and link relative |col 3 =LR = RET<br>PC = PC + address}} |
| + | |||
{{inst|cols=5|section=<span id="miscellaneous_instructions">'''Miscellaneous Instructions'''</span>}} | {{inst|cols=5|section=<span id="miscellaneous_instructions">'''Miscellaneous Instructions'''</span>}} | ||
| − | + | {{inst|mn=SWI |col 1=SWI<cond> imm |col 2=Software interrupt |col 3 =LR = RET<br>Execute SWI vector in supervisor mode}} | |
}} | }} | ||
Revision as of 18:33, 27 June 2017
ARMv1 is the first ARM instruction set version. Introduced with the ARM1 on April 26 1985, the ARMv1 defines a 32-bit ISA along with 26-bit addressing space. The ARMv1 was only implemented by the ARM1 and was replaced soon after by the ARM2. Only a few hundred of those chips were ever fabricated.
Overview
The ARMv1 is a simple architecture. Each instruction is 32-bit in size and operates on two 32-bit operands. There is a program counter which is 26 bits in size allowing for an address space of up to 64 MiB of data.
Registers
There are 16 general purpose 32-bit registers. With the exception of register 15, all registers are orthogonal with no specific designated purpose.
Instruction Listing
The ARMv1 is broken down into 8 classes of instruction:
- Movement Instructions
- Load Instructions
- Store Instructions
- Arithmetic Instructions
- Logical Instructions
- Comparison Instructions
- Branch Instructions
- Miscellaneous Instructions
| ARMv1 ISA | ||||
|---|---|---|---|---|
| Mnemonic | Syntax | Description | Action | |
| Movement Instructions | ||||
| MOV | MOV<cond>{S} Rd, #imm | Move value immed | Rd = immed | |
| MOV | MOV<cond>{S} Rd, Rm, {, <shift>} | Move value | Rd = {shifted Rm} | |
| MVN | MVN<cond>{S} Rd, #imm | Move NOT value immed | Rd = ¬immed | |
| MVN | MVN<cond>{S} Rd, Rm, {, <shift>} | Move NOT value | Rd = ¬{shifted Rm} | |
| Load Instructions | ||||
| LDM | LDM<cond><type> Rn{!}, <reglist>{^} | Load multiple | addr = Rn for each Rd in {reglist}: Rd = [addr] update address based on {type} | |
| LDR | LDR<cond>{B} Rd, [Rn {, #imm}]{!} | Load register immed | Rd = [Rn + imm] If !: Rn = Rn + imm | |
| LDR | LDR<cond>{B} Rd, [Rn, Rm {, <shift>}]{!} | Load register | Rd = [Rn + {shifted Rm}] If !: Rn = Rn + {shifted Rm}] | |
| LDR | LDR<cond>{B}{T} Rd, [Rn], #imm | Load register, post index | Rd = [Rn] Rn = Rn + imm | |
| LDR | LDR<cond>{B}{T} Rd, [Rn], Rm {, <shift>} | Load register, post index | Rd = [Rn] Rn = Rn + {shifted Rm} | |
| Store Instructions | ||||
| STM | STM<cond><type> Rn{!}, <reglist>{^} | Store multiple | addr = Rn for each Rd in {reglist}: [addr] = Rd update address based on {type} | |
| STR | STR<cond>{B} Rd, [Rn {, #imm}]{!} | Store register immed | [Rn + imm] = Rd If !: Rn = Rn + imm | |
| STR | STR<cond>{B} Rd, [Rn, Rm {, <shift>}]{!} | Store register | [Rn + {shifted Rm}] = Rd If !: Rn = Rn + {shifted Rm}] | |
| STR | STR<cond>{B}{T} Rd, [Rn], #imm | Store register, post index | [Rn] = Rd Rn = Rn + imm | |
| STR | STR<cond>{B}{T} Rd, [Rn], Rm {, <shift>} | Store register, post index | [Rn] = Rd Rn = Rn + {shifted Rm} | |
| Arithmetic Instructions | ||||
| ADC | ADC<cond>{S} Rd, Rn, #imm | Add and carry immed | Rd = Rn + imm + C | |
| ADC | ADC<cond>{S} Rd, Rn, Rm{, <shift>} | Add and carry | Rd = Rn + {shifted Rm} + C | |
| ADD | ADD<cond>S Rd, Rn, #imm | Add immed | Rd = Rn + imm | |
| ADD | ADD<cond>S Rd, Rn, Rm{, <shift>} | Add | Rd = Rn + {shifted Rm} | |
| RSB | RSB<cond>S Rd, Rn, #imm | Reverse subtract immed | Rd = imm - Rn | |
| RSB | RSB<cond>S Rd, Rn, Rm{, <shift>} | Reverse subtract | Rd = {shifted Rm} - Rn | |
| RSC | RSB<cond>S Rd, Rn, #imm | Reverse subtract with carry immed | Rd = imm - Rn - ¬C | |
| RSC | RSB<cond>S Rd, Rn, Rm{, <shift>} | Reverse subtract with carry | Rd = {shifted Rm} - Rn - ¬C | |
| SBC | SBC<cond>{S} Rd, Rn, #imm | Subtract with carry immed | Rd = Rn - imm - ¬C | |
| SBC | SBC<cond>{S} Rd, Rn, Rm{, <shift>} | Subtract with carry | Rd = Rn - {shifted Rm} - ¬C | |
| SUB | SUB<cond>{S} Rd, Rn, #imm | Subtract immed | Rd = Rn - imm | |
| SUB | SUB<cond>{S} Rd, Rn, Rm{, <shift>} | Subtract | Rd = Rn - {shifted Rm} | |
| Logical Instructions | ||||
| AND | AND<cond>{S} Rd, Rn, #imm | AND immed | Rd = Rn & imm | |
| AND | AND<cond>{S} Rd, Rn, Rm{, <shift>} | AND | Rd = Rn & {shifted Rm} | |
| BIC | BIC<cond>{S} Rd, Rn, #imm | Bit clear immed | Rd = Rn & ¬imm | |
| BIC | BIC<cond>{S} Rd, Rn, Rm{, <shift>} | Bit clear | Rd = Rn & ¬Rm | |
| EOR | EOR<cond>{S} Rd, Rn, #imm | Exclusive OR immed | Rd = Rn ⊕ imm | |
| EOR | EOR<cond>{S} Rd, Rn, Rm{, <shift>} | Exclusive OR | Rd = Rn ⊕ {shifted Rm} | |
| ORR | ORR<cond>{S} Rd, Rn, #imm | Logical OR immed | Rd = Rn ∥ imm | |
| ORR | ORR<cond>{S} Rd, Rn, Rm{, <shift>} | Logical OR | Rd = Rn ∥ {shifted Rm} | |
| Comparison Instructions | ||||
| CMN | CMN<cond> Rn, #imm | Compare negative immed | CPSR flags set on (Rn + imm) | |
| CMN | CMN<cond> Rn, Rm{, <shift>} | Compare negative | CPSR flags set on (Rn + {shifted Rm}) | |
| CMP | CMP<cond> Rn, #imm | Compare immed | CPSR flags set on (Rn - imm) | |
| CMP | CMP<cond> Rn, Rm{, <shift>} | Compare | CPSR flags set on (Rn - {shifted Rm}) | |
| TEQ | TEQ<cond> Rn, #imm | Test equality immed | CPSR flags set on (Rn ⊕ imm) | |
| TEQ | TEQ<cond> Rn, Rm{, <shift>} | Test equality | CPSR flags set on (Rn ⊕ {shifted Rm}) | |
| TST | TST<cond> Rn, #imm | Test bits immed | CPSR flags set on (Rn & imm) | |
| TST | TST<cond> Rn, Rm{, <shift>} | Test bits | CPSR flags set on (Rn & {shifted Rm}) | |
| Branch Instructions | ||||
| B | B<cond> imm | Branch relative | PC = PC + address | |
| BL | BL<cond> imm | Branch and link relative | LR = RET PC = PC + address | |
| Miscellaneous Instructions | ||||
| SWI | SWI<cond> imm | Software interrupt | LR = RET Execute SWI vector in supervisor mode | |