參數(shù)資料
型號： ARM60
廠商： Mitel Networks Corporation
英文描述： Low Power General Purpose 32-Bit RISC Microprocessor(低功耗通用32位精簡指令集微處理器)
中文描述： 低功耗通用32位RISC微處理器（低功耗通用32位精簡指令集微處理器）
文件頁數(shù)： 55/121頁
文件大?。?/td> 1217K
代理商： ARM60
Instruction Set - SWI
51
4.10.5 Examples
SWI
SWI
SWINE
ReadC
WriteI+”k”
0
; get next character from read stream
; output a “k” to the write stream
; conditionally call supervisor
; with 0 in comment field
The above examples assume that suitable supervisor code exists, for instance:
0x08 B Supervisor
; SWI entry point
EntryTable
DCD ZeroRtn
DCD ReadCRtn
DCD WriteIRtn
. . .
; addresses of supervisor routines
Zero
ReadC
WriteI
EQU 0
EQU 256
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
LDR
BIC
MOV
ADR
LDR
R13,{R0-R2,R14}
R0,[R14,#-4]
R0,R0,#0xFF000000
R1,R0,LSR#8
R2,EntryTable
R15,[R2,R1,LSL#2]
; save work registers and return address
; get SWI instruction
; clear top 8 bits
; get routine offset
; get start address of entry table
; branch to appropriate routine
WriteIRtn
. . . . . .
LDMFD
; enter with character in R0 bits 0-7
R13,{R0-R2,R15}^
; restore workspace and return
; restoring processor mode and flags
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