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| 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)營理論主機接口（誘導(dǎo)因子）規(guī)格 |
| 文件頁數(shù)： | 31/118頁 |
| 文件大?。?/td> | 356K |
| 代理商： | HIF_SPEC |
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Host Interface (HIF) Specification
3–7
Service 1 – exit
Terminate a Program
Description
This service terminates the current program and returns a value to the system
kernel, indicating the reason for termination. By convention, a zero passed in
lr2
indicates normal termination, while any nonzero value indicates an
abnormal termination condition. There are no returned values in registers
gr96
and
gr121
since this service does not return.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
1 (0x1)
Service number
lr2
exitcode
User-supplied exit code
Returns:
gr96
undefined
This service call does not return
gr121
undefined
This service call does not return
Example Call
const
lr2,1
;exit code = 1
const
gr121,1
;service = 1
asneq
69,gr1,gr1
;call the operating system
In the above example, the operating system kernel is being called with service
code 1 and an exit code of 1, which is interpreted according to the
specifications of the individual operating system. The value of the exit code is
not defined as part of the HIF specification.
In general, however, an exit code of zero (0) specifies a normal program
termination condition, while a nonzero code specifies an abnormal termination
resulting from detection of an error condition within the program.
Programs can terminate normally by falling through the curly brace at the end
of the
main
function in a C-language program. Other languages may require an
explicit call to the kernel’s
exit
service.
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