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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/lib/strnlen_user.S
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ia64/lib/strnlen_user.S')
-rw-r--r--arch/ia64/lib/strnlen_user.S45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/ia64/lib/strnlen_user.S b/arch/ia64/lib/strnlen_user.S
new file mode 100644
index 000000000000..d09066b1e49d
--- /dev/null
+++ b/arch/ia64/lib/strnlen_user.S
@@ -0,0 +1,45 @@
+/*
+ * Returns 0 if exception before NUL or reaching the supplied limit (N),
+ * a value greater than N if the string is longer than the limit, else
+ * strlen.
+ *
+ * Inputs:
+ * in0: address of buffer
+ * in1: string length limit N
+ * Outputs:
+ * r8: 0 in case of fault, strlen(buffer)+1 otherwise
+ *
+ * Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <asm/asmmacro.h>
+
+GLOBAL_ENTRY(__strnlen_user)
+ .prologue
+ alloc r2=ar.pfs,2,0,0,0
+ .save ar.lc, r16
+ mov r16=ar.lc // preserve ar.lc
+
+ .body
+
+ add r3=-1,in1
+ ;;
+ mov ar.lc=r3
+ mov r9=0
+ ;;
+ // XXX braindead strlen loop---this needs to be optimized
+.Loop1:
+ EXCLR(.Lexit, ld1 r8=[in0],1)
+ add r9=1,r9
+ ;;
+ cmp.eq p6,p0=r8,r0
+(p6) br.cond.dpnt .Lexit
+ br.cloop.dptk.few .Loop1
+
+ add r9=1,in1 // NUL not found---return N+1
+ ;;
+.Lexit:
+ mov r8=r9
+ mov ar.lc=r16 // restore ar.lc
+ br.ret.sptk.many rp
+END(__strnlen_user)