Mercurial > sos > sos

diff arch/svcint.S @ 83:ca308c8ca41e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
beginning of svc support code
author Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
date Wed, 27 Apr 2011 12:16:35 -0400
parents
children 5f3618fbf9ae
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/arch/svcint.S	Wed Apr 27 12:16:35 2011 -0400
@@ -0,0 +1,26 @@
+#include "svcint.h"
+
+.text
+	.align	4
+.globl SVCINT
+	.type	SVCINT, @function
+SVCINT:
+	stmg	%r0,%r15,_PSA_GPRS
+
+	xgr	%r2,%r2
+	ic	%r2,_PSA_SVC_ID+3	# r2 = SVC
+	lmg	%r3,%r6,_PSA_GPRS+16	# shift all the args
+	xgr	%r7,%r7			# just to make sure accesses to more
+					# than 4 args fail
+	larl	%r15,_SVC_STACK
+	lg	%r15,%r15
+
+	# call into C... f(svc, arg0, arg1, arg2, arg3)
+	larl	%r14,_SVC_HANDLER
+	lg	%r14,%r14
+	basr	%r14,%r14
+
+	stmg	%r2,%r3,_PSA_GPRS+16	# store the return value
+
+	lmg	%r0,%r15,_PSA_GPRS
+	lpswe	_PSA_OLD_SVC_PSW