ARM VERSION 1.2 Scheda Tecnica Pagina 161

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Semihosting
ARM DUI0058D Copyright © 1999-2001 ARM Limited. All rights reserved. 5-23
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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