參數(shù)資料
型號: HIF_SPEC
英文描述: EZ-030 Demonstration Board Theory of Operation Host Interface (HIF) Specification
中文描述: 易- 030演示板的經(jīng)營理論主機(jī)接口(誘導(dǎo)因子)規(guī)格
文件頁數(shù): 82/118頁
文件大?。?/td> 356K
代理商: HIF_SPEC
3–58
Host Interface (HIF) Specification
82
Example Call
oldtrap: .word
0
;placeholder for old
;trap address
const
lr2,54
;floating divide trap
;vector (V_FDIV)
const
lr3,new_div
;set new_div as the
consth
lr3,new_div
;trap handler address
const
gr121,290
;service = 289
asneq
69,gr1,gr1
;call the OS
jmpf
gr121,trap_err
;jump if error
const
gr120,oldtrap
;set address for saving
consth
gr120,oldtrap
;the old trap handler
;address
store
0,0,gr96,gr120
;save the old handler
;address
In the example call, a new handler for the floating-point division operation is
being installed. If the implementation returns an error, the program jumps to
the
trap_err
label. If the service was successful and a new trap handler was
installed, the previous handler address (if any) is stored into the
oldtrap
variable.
There is often a need for programs operating on dedicated hardware to enter
supervisor mode. This can be accomplished by reserving a trap vector for that
purpose and installing a trap-handler routine to return control to the user in
supervisor mode. The operation is effected by issuing an assert instruction that
invokes the specified trap. User mode can be restored by clearing (setting to 0)
the Supervisor Mode bit (4) of the Current Processor Status register (CPS).
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