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-rw-r--r--arch/ia64/kernel/mca_drv_asm.S56
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/ia64/kernel/mca_drv_asm.S b/arch/ia64/kernel/mca_drv_asm.S
new file mode 100644
index 000000000..4428f57be
--- /dev/null
+++ b/arch/ia64/kernel/mca_drv_asm.S
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * File: mca_drv_asm.S
+ * Purpose: Assembly portion of Generic MCA handling
+ *
+ * Copyright (C) 2004 FUJITSU LIMITED
+ * Copyright (C) 2004 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
+ */
+#include <linux/threads.h>
+
+#include <asm/asmmacro.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+
+GLOBAL_ENTRY(mca_handler_bhhook)
+ invala // clear RSE ?
+ cover
+ ;;
+ clrrrb
+ ;;
+ alloc r16=ar.pfs,0,2,3,0 // make a new frame
+ mov ar.rsc=0
+ mov r13=IA64_KR(CURRENT) // current task pointer
+ ;;
+ mov r2=r13
+ ;;
+ addl r22=IA64_RBS_OFFSET,r2
+ ;;
+ mov ar.bspstore=r22
+ addl sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2
+ ;;
+ adds r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
+ ;;
+ st1 [r2]=r0 // clear current->thread.on_ustack flag
+ mov loc0=r16
+ movl loc1=mca_handler_bh // recovery C function
+ ;;
+ mov out0=r8 // poisoned address
+ mov out1=r9 // iip
+ mov out2=r10 // psr
+ mov b6=loc1
+ ;;
+ mov loc1=rp
+ ssm psr.ic
+ ;;
+ srlz.i
+ ;;
+ ssm psr.i
+ br.call.sptk.many rp=b6 // does not return ...
+ ;;
+ mov ar.pfs=loc0
+ mov rp=loc1
+ ;;
+ mov r8=r0
+ br.ret.sptk.many rp
+END(mca_handler_bhhook)