參數(shù)資料
型號: ARM610
廠商: Mitel Networks Corporation
英文描述: General Purpose 32-Bit Microprocessor with 4kByte Cache,Write Buffer and Memory Management Unit(通用32位微處理器(帶4K字節(jié)緩存,寫緩沖器和存儲器管理單元))
中文描述: 通用32位微處理器4KB的高速緩存,寫緩沖器和存儲器管理單元(通用32位微處理器(帶4K的字節(jié)緩存,寫緩沖器和存儲器管理單元))
文件頁數(shù): 74/174頁
文件大?。?/td> 694K
代理商: ARM610
Instruction Set - SWI
ARM610 Data Sheet
4-46
O
4.11.4 Assembler syntax
SWI{cond} <expression>
{cond}
two character condition mnemonic,
·
Table 4-2: Condition
code summaryon page 4-6.
<expression>
is evaluated and placed in the comment field (which is
ignored by ARM610).
4.11.5 Examples
SWI
SWI
SWINE 0
ReadC
WriteI+”k”
; Get next character from read stream.
; Output a “k” to the write stream.
; Conditionally call supervisor
; with 0 in comment field.
Supervisor code
The previous examples assume that suitable supervisor code exists, for instance:
0x08 B Supervisor ; SWI entry point
EntryTable ; addresses of supervisor routines
DCD ZeroRtn
DCD ReadCRtn
DCD WriteIRtn
. . .
Zero
EQU 0
ReadC EQU 256
WriteI EQU 512
Supervisor
; SWI has routine required in bits 8-23 and data (if any) in
; bits 0-7.
; Assumes R13_svc points to a suitable stack
STMFD R13,{R0-R2,R14}
; Save work registers and return
; address.
; Get SWI instruction.
LDR
BIC
MOV
ADR
LDR
R0,[R14,#-4]
R0,R0,#0xFF000000 ; Clear top 8 bits.
R1,R0,LSR#8
; Get routine offset.
R2,EntryTable
; Get start address of entry table.
R15,[R2,R1,LSL#2] ; Branch to appropriate routine.
WriteIRtn
. . . . . .
LDMFD R13,{R0-R2,R15}^
; Enter with character in R0 bits 0-7.
; Restore workspace and return,
; restoring processor mode and flags.
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