* [Linux-ia64] [patch] 2.4.21-pre5 ia64 unwind.c - allow unw_access_gr(r0)
@ 2003-03-14 4:37 Keith Owens
2003-03-14 19:26 ` David Mosberger
0 siblings, 1 reply; 2+ messages in thread
From: Keith Owens @ 2003-03-14 4:37 UTC (permalink / raw)
To: linux-ia64
Patch is against 2.4.21-pre5 + ia64-021210 + unwind patches from bk
tree (it would be nice to have a released 2.4.21-pre5-ia64 version).
The patch allows unw_access_gr() to read from r0, to support unwind
directives such as .save ar.pfs,r0 and .save rp,r0.
diff -urN 2.4.21-pre5-ia64/arch/ia64/kernel/unwind.c 2.4.21-pre5-ia64/arch/ia64/kernel/unwind.c
--- 2.4.21-pre5-ia64/arch/ia64/kernel/unwind.c Fri Mar 14 15:24:18 2003
+++ 2.4.21-pre5-ia64/arch/ia64/kernel/unwind.c Fri Mar 14 15:23:17 2003
@@ -253,6 +253,11 @@
struct pt_regs *pt;
if ((unsigned) regnum - 1 >= 127) {
+ if (regnum = 0 && !write) {
+ *val = 0; /* read r0 always returns 0 */
+ *nat = 0;
+ return 0;
+ }
UNW_DPRINT(0, "unwind.%s: trying to access non-existent r%u\n",
__FUNCTION__, regnum);
return -1;
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Linux-ia64] [patch] 2.4.21-pre5 ia64 unwind.c - allow unw_access_gr(r0)
2003-03-14 4:37 [Linux-ia64] [patch] 2.4.21-pre5 ia64 unwind.c - allow unw_access_gr(r0) Keith Owens
@ 2003-03-14 19:26 ` David Mosberger
0 siblings, 0 replies; 2+ messages in thread
From: David Mosberger @ 2003-03-14 19:26 UTC (permalink / raw)
To: linux-ia64
>>>>> On Fri, 14 Mar 2003 15:37:46 +1100, Keith Owens <kaos@sgi.com> said:
Keith> Patch is against 2.4.21-pre5 + ia64-021210 + unwind patches
Keith> from bk tree (it would be nice to have a released
Keith> 2.4.21-pre5-ia64 version). The patch allows unw_access_gr()
Keith> to read from r0, to support unwind directives such as .save
Keith> ar.pfs,r0 and .save rp,r0.
I applied this patch in the 2.5 tree.
Thanks,
--david
^ permalink raw reply [flat|nested] 2+ messages in thread
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2003-03-14 4:37 [Linux-ia64] [patch] 2.4.21-pre5 ia64 unwind.c - allow unw_access_gr(r0) Keith Owens
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