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-rw-r--r--arch/ia64/kernel/traps.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index d3e0ecb..5539190 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -530,12 +530,15 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
if (fsys_mode(current, &regs)) {
extern char __kernel_syscall_via_break[];
/*
- * Got a trap in fsys-mode: Taken Branch Trap and Single Step trap
- * need special handling; Debug trap is not supposed to happen.
+ * Got a trap in fsys-mode: Taken Branch Trap
+ * and Single Step trap need special handling;
+ * Debug trap is ignored (we disable it here
+ * and re-enable it in the lower-privilege trap).
*/
if (unlikely(vector == 29)) {
- die("Got debug trap in fsys-mode---not supposed to happen!",
- &regs, 0);
+ set_thread_flag(TIF_DB_DISABLED);
+ ia64_psr(&regs)->db = 0;
+ ia64_psr(&regs)->lp = 1;
return;
}
/* re-do the system call via break 0x100000: */
@@ -589,10 +592,19 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
case 34:
if (isr & 0x2) {
/* Lower-Privilege Transfer Trap */
+
+ /* If we disabled debug traps during an fsyscall,
+ * re-enable them here.
+ */
+ if (test_thread_flag(TIF_DB_DISABLED)) {
+ clear_thread_flag(TIF_DB_DISABLED);
+ ia64_psr(&regs)->db = 1;
+ }
+
/*
- * Just clear PSR.lp and then return immediately: all the
- * interesting work (e.g., signal delivery is done in the kernel
- * exit path).
+ * Just clear PSR.lp and then return immediately:
+ * all the interesting work (e.g., signal delivery)
+ * is done in the kernel exit path.
*/
ia64_psr(&regs)->lp = 0;
return;