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)： 91/118頁
文件大小： 356K
代理商： HIF_SPEC
Host Interface (HIF) Specification
3–67
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
321 (0x141)
Service number
lr2
newsig
Address if signal handler, or NULL
pointer
Old handler address
Returns:
gr96
oldsig
gr121
0x80000000
errcode
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
Example Call
oldhdlr: .word
0
const
lr2,user_sigs
;address of user signal
consth
lr2,user_sigs
;handler
const
gr121,321
;service = 321
asneq
69,gr1,gr1
;call the OS to install
;the handler
jmpf
gr121,sig_err
;jump to handle error
const
gr120,oldhdlr
;set address to store
consth
gr120,oldhdlr
;old handler address
store
0,0,gr96,gr120
;store the old handler
;address
In the example call, a user signal handler whose entry-point name is
user_sigs
is installed. When the service returns, if
gr121
contains a FALSE value, the
program jumps to an error routine; otherwise, the address of the previously
installed handler returned in
gr96
is stored in the local variable
oldhdlr
.
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