ARM VERSION 1.2 Arkusz Danych Pobierz pdf (Strona 161)

Semihosting

5.4.18 SYS_ERRNO (0x13)

Returns the value of the C library

errno

variable associated with the host

implementation of the semihosting SWIs. The

errno

variable can be set by a number of

C library semihosted functions, including:

• SYS_REMOVE

• SYS_OPEN

• SYS_CLOSE

• SYS_READ

• SYS_WRITE

• SYS_SEEK.

Whether

errno

is set or not, and to what value, is entirely host-specific, except where

the ANSI C standard defines the behavior.

Entry

There are no parameters. Register r1 must be zero.

Return

On exit, r0 contains the value of the C library

errno

variable.

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ARM VERSION 1.2 Arkusz Danych Strona 161