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| 型號(hào)： | 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(yíng)理論主機(jī)接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁(yè)數(shù)： | 22/118頁(yè) |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
2–5
Example Assembly Code
The following code fragment shows how the definitions given previously are
implemented in Am29000 processor assembly-language to invoke the
open
HIF service to open a file:
const
consth
const
const
asneq
lr2,input_file
lr2,input_file
lr3,O_RDONLY
gr121,17
69,gr1,gr1
;set input file
;pathname address
;set open mode
;service number=17 (open)
;force trap 69
;(a system call)
;handle service error
jmpf
nop
gr121,err_hand
In this example, local register
lr2
is loaded with the address of the filename
constant; local register
lr3
contains the code: O_RDONLY, indicating that the
file is to be opened for read-only access. The service number (17) is loaded
into global register
gr121
and the service is executed by asserting that register
gr1
is not equal to itself. Since this is FALSE, the trap is invoked. Upon return
from the service, global register
gr121
contains either a TRUE value,
indicating that the service was successful; or a positive nonzero error code,
indicating that the service could not complete. If an error code is returned,
gr121
will test as FALSE, providing the means to invoke an appropriate error
handler routine.
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