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authorKeith Owens <kaos@sgi.com>2005-05-27 23:09:00 -0700
committerTony Luck <tony.luck@intel.com>2005-06-08 12:25:24 -0700
commit70aa488cff83c965c9e1850f48d82b000d0d6c1c (patch)
tree9236fa880fe3fab2ee3cf2bcb0ec4a4e19ded3c5 /arch
parent86ebacd360767f6a5cf9c8810977593dccf3f3da (diff)
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[IA64] Extract correct break number for break.b
break.b does not store the break number in cr.iim, instead it stores 0, which makes all break.b instructions look like BUG(). Extract the break number from the instruction itself. Signed-off-by: Keith Owens <kaos@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/kernel/traps.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index e82ad78081b..9bad6652d53 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -111,6 +111,24 @@ ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
siginfo_t siginfo;
int sig, code;
+ /* break.b always sets cr.iim to 0, which causes problems for
+ * debuggers. Get the real break number from the original instruction,
+ * but only for kernel code. User space break.b is left alone, to
+ * preserve the existing behaviour. All break codings have the same
+ * format, so there is no need to check the slot type.
+ */
+ if (break_num == 0 && !user_mode(regs)) {
+ struct ia64_psr *ipsr = ia64_psr(regs);
+ unsigned long *bundle = (unsigned long *)regs->cr_iip;
+ unsigned long slot;
+ switch (ipsr->ri) {
+ case 0: slot = (bundle[0] >> 5); break;
+ case 1: slot = (bundle[0] >> 46) | (bundle[1] << 18); break;
+ default: slot = (bundle[1] >> 23); break;
+ }
+ break_num = ((slot >> 36 & 1) << 20) | (slot >> 6 & 0xfffff);
+ }
+
/* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
siginfo.si_imm = break_num;