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-rw-r--r--arch/x86/entry/thunk_32.S36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/x86/entry/thunk_32.S b/arch/x86/entry/thunk_32.S
new file mode 100644
index 0000000000..ff6e7003da
--- /dev/null
+++ b/arch/x86/entry/thunk_32.S
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
+ * Copyright 2008 by Steven Rostedt, Red Hat, Inc
+ * (inspired by Andi Kleen's thunk_64.S)
+ */
+ #include <linux/linkage.h>
+ #include <asm/asm.h>
+ #include <asm/export.h>
+
+ /* put return address in eax (arg1) */
+ .macro THUNK name, func, put_ret_addr_in_eax=0
+SYM_CODE_START_NOALIGN(\name)
+ pushl %eax
+ pushl %ecx
+ pushl %edx
+
+ .if \put_ret_addr_in_eax
+ /* Place EIP in the arg1 */
+ movl 3*4(%esp), %eax
+ .endif
+
+ call \func
+ popl %edx
+ popl %ecx
+ popl %eax
+ RET
+ _ASM_NOKPROBE(\name)
+SYM_CODE_END(\name)
+ .endm
+
+ THUNK preempt_schedule_thunk, preempt_schedule
+ THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
+ EXPORT_SYMBOL(preempt_schedule_thunk)
+ EXPORT_SYMBOL(preempt_schedule_notrace_thunk)
+