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From: Marcel Moolenaar <marcel@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 29181 for review
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http://perforce.freebsd.org/chv.cgi?CH=29181

Change 29181 by marcel@marcel_nfs on 2003/04/18 00:43:24

	We don't preserve the non-local registers in the register
	window, and since we turn all input registers into output
	registers, as part of the syscall code, we cannot use any
	inputs after the syscall. Note that this is completely
	in accordance with the runtime specs. Save registers in
	the memory stack scratch area if we need them after the
	syscall.

Affected files ...

.. //depot/projects/ia64_epc/lib/libc/ia64/sys/brk.S#3 edit
.. //depot/projects/ia64_epc/lib/libc/ia64/sys/pipe.S#3 edit
.. //depot/projects/ia64_epc/lib/libc/ia64/sys/sbrk.S#3 edit

Differences ...

==== //depot/projects/ia64_epc/lib/libc/ia64/sys/brk.S#3 (text+ko) ====

@@ -45,11 +45,13 @@
 	ld8	r14=[r14] ;;
 	ld8	r14=[r14] ;;
 	cmp.ltu	p6,p0=r32,r14 ;;
-(p6)	mov	r32=r14
+(p6)	mov	r32=r14 ;;
+	st8	[sp]=r32
 	CALLSYS_ERROR(break)
+	ld8	r15=[sp]
 	add	r14=@ltoff(curbrk),gp ;;
 	ld8	r14=[r14] ;;
-	st8	[r14]=r32
+	st8	[r14]=r15
 	mov	ret0=0
 	br.ret.sptk.few rp
 END(brk)

==== //depot/projects/ia64_epc/lib/libc/ia64/sys/pipe.S#3 (text+ko) ====

@@ -32,10 +32,16 @@
 
 #include "SYS.h"
 
-SYSCALL(pipe)
-	.regstk	1,0,0,0
-	st4	[in0]=ret0,4 ;;
-	st4	[in0]=ret1
-	mov	ret0=0
+ENTRY(__sys_pipe, 1)
+	WEAK_ALIAS(pipe, __sys_pipe)
+	WEAK_ALIAS(_pipe, __sys_pipe)
+	st8		[sp]=r32
+	CALLSYS_ERROR(pipe)
+	ld8		r14=[sp]
+	;;
+	st4		[r14]=ret0,4
+	;;
+	st4		[r14]=ret1
+	mov		ret0=0
 	br.ret.sptk.few rp
-END(pipe)
+END(__sys_pipe)

==== //depot/projects/ia64_epc/lib/libc/ia64/sys/sbrk.S#3 (text+ko) ====

@@ -49,12 +49,15 @@
 (p6)	br.ret.sptk.few	rp
 	;;
 	add	r32 = ret0, r32
+	;;
+	st8	[sp] = r32
 	CALLSYS_ERROR(break)
+	ld8	r15 = [sp]
 	add	r14 = @ltoff(curbrk), gp
 	;;
 	ld8	r14 = [r14]
 	;;
 	ld8	ret0 = [r14]
-	st8	[r14] = r32
+	st8	[r14] = r15
 	br.ret.sptk.few	rp
 END(sbrk)