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)營理論主機接口(誘導(dǎo)因子)規(guī)格
文件頁數(shù): 73/118頁
文件大小: 356K
代理商: HIF_SPEC
Host Interface (HIF) Specification
3–49
Service 260 – getargs
Return Base Address
Description
This service returns the base address of the command-line-argument vector,
argv
, in register
gr96
, as constructed by the operating-system kernel when an
application program is invoked.
Arguments are stored by the operating system as a series of NULL-terminated
character strings. A pointer containing the address of each string is stored in an
array whose base address (referred to as
argv
) is returned by the
getargs
HIF
service. The last entry in the array contains a NULL pointer (an address
consisting of all zero bits). The number of arguments can be computed by
counting the number of pointers in the array, using the fact that the NULL
pointer terminates the list.
Register Usage
Type
Regs
Contents
Description
Calling:
gr121
260 (0x104)
Service number
Returns:
gr96
baseaddr
Success: base address of argv
Failure:
0 (NULL pointer)
Logical TRUE, service successful
Error number, service not successful
(implementation dependent)
gr121
0x80000000
errcode
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