summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/rtrap_64.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/rtrap_64.S')
-rw-r--r--arch/sparc/kernel/rtrap_64.S33
1 files changed, 30 insertions, 3 deletions
diff --git a/arch/sparc/kernel/rtrap_64.S b/arch/sparc/kernel/rtrap_64.S
index 0b21042ab181..f6528884a2c8 100644
--- a/arch/sparc/kernel/rtrap_64.S
+++ b/arch/sparc/kernel/rtrap_64.S
@@ -25,13 +25,31 @@
.align 32
__handle_preemption:
call SCHEDULE_USER
- wrpr %g0, RTRAP_PSTATE, %pstate
+661: wrpr %g0, RTRAP_PSTATE, %pstate
+ /* If userspace is using ADI, it could potentially pass
+ * a pointer with version tag embedded in it. To maintain
+ * the ADI security, we must re-enable PSTATE.mcde before
+ * we continue execution in the kernel for another thread.
+ */
+ .section .sun_m7_1insn_patch, "ax"
+ .word 661b
+ wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
+ .previous
ba,pt %xcc, __handle_preemption_continue
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
__handle_user_windows:
call fault_in_user_windows
- wrpr %g0, RTRAP_PSTATE, %pstate
+661: wrpr %g0, RTRAP_PSTATE, %pstate
+ /* If userspace is using ADI, it could potentially pass
+ * a pointer with version tag embedded in it. To maintain
+ * the ADI security, we must re-enable PSTATE.mcde before
+ * we continue execution in the kernel for another thread.
+ */
+ .section .sun_m7_1insn_patch, "ax"
+ .word 661b
+ wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
+ .previous
ba,pt %xcc, __handle_preemption_continue
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
@@ -48,7 +66,16 @@ __handle_signal:
add %sp, PTREGS_OFF, %o0
mov %l0, %o2
call do_notify_resume
- wrpr %g0, RTRAP_PSTATE, %pstate
+661: wrpr %g0, RTRAP_PSTATE, %pstate
+ /* If userspace is using ADI, it could potentially pass
+ * a pointer with version tag embedded in it. To maintain
+ * the ADI security, we must re-enable PSTATE.mcde before
+ * we continue execution in the kernel for another thread.
+ */
+ .section .sun_m7_1insn_patch, "ax"
+ .word 661b
+ wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
+ .previous
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
/* Signal delivery can modify pt_regs tstate, so we must