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-rw-r--r--arch/powerpc/include/asm/static_call.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/static_call.h b/arch/powerpc/include/asm/static_call.h
new file mode 100644
index 000000000..de1018cc5
--- /dev/null
+++ b/arch/powerpc/include/asm/static_call.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_STATIC_CALL_H
+#define _ASM_POWERPC_STATIC_CALL_H
+
+#define __PPC_SCT(name, inst) \
+ asm(".pushsection .text, \"ax\" \n" \
+ ".align 5 \n" \
+ ".globl " STATIC_CALL_TRAMP_STR(name) " \n" \
+ STATIC_CALL_TRAMP_STR(name) ": \n" \
+ inst " \n" \
+ " lis 12,2f@ha \n" \
+ " lwz 12,2f@l(12) \n" \
+ " mtctr 12 \n" \
+ " bctr \n" \
+ "1: li 3, 0 \n" \
+ " blr \n" \
+ "2: .long 0 \n" \
+ ".type " STATIC_CALL_TRAMP_STR(name) ", @function \n" \
+ ".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
+ ".popsection \n")
+
+#define PPC_SCT_RET0 20 /* Offset of label 1 */
+#define PPC_SCT_DATA 28 /* Offset of label 2 */
+
+#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func) __PPC_SCT(name, "b " #func)
+#define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name) __PPC_SCT(name, "blr")
+#define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name) __PPC_SCT(name, "b .+20")
+
+#endif /* _ASM_POWERPC_STATIC_CALL_H */