objtool/LoongArch: Enable orc to be built

[linux-2.6-microblaze.git] / tools / arch / loongarch / include / asm / orc_types.h

diff --git a/tools/arch/loongarch/include/asm/orc_types.h b/tools/arch/loongarch/include/asm/orc_types.h
new file mode 100644 (file)
index 0000000..caf1f71
--- /dev/null
+++ b/tools/arch/loongarch/include/asm/orc_types.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef _ORC_TYPES_H
+#define _ORC_TYPES_H
+
+#include <linux/types.h>
+
+/*
+ * The ORC_REG_* registers are base registers which are used to find other
+ * registers on the stack.
+ *
+ * ORC_REG_PREV_SP, also known as DWARF Call Frame Address (CFA), is the
+ * address of the previous frame: the caller's SP before it called the current
+ * function.
+ *
+ * ORC_REG_UNDEFINED means the corresponding register's value didn't change in
+ * the current frame.
+ *
+ * The most commonly used base registers are SP and FP -- which the previous SP
+ * is usually based on -- and PREV_SP and UNDEFINED -- which the previous FP is
+ * usually based on.
+ *
+ * The rest of the base registers are needed for special cases like entry code
+ * and GCC realigned stacks.
+ */
+#define ORC_REG_UNDEFINED              0
+#define ORC_REG_PREV_SP                        1
+#define ORC_REG_SP                     2
+#define ORC_REG_FP                     3
+#define ORC_REG_MAX                    4
+
+#define ORC_TYPE_UNDEFINED             0
+#define ORC_TYPE_END_OF_STACK          1
+#define ORC_TYPE_CALL                  2
+#define ORC_TYPE_REGS                  3
+#define ORC_TYPE_REGS_PARTIAL          4
+
+#ifndef __ASSEMBLY__
+/*
+ * This struct is more or less a vastly simplified version of the DWARF Call
+ * Frame Information standard.  It contains only the necessary parts of DWARF
+ * CFI, simplified for ease of access by the in-kernel unwinder.  It tells the
+ * unwinder how to find the previous SP and FP (and sometimes entry regs) on
+ * the stack for a given code address.  Each instance of the struct corresponds
+ * to one or more code locations.
+ */
+struct orc_entry {
+       s16             sp_offset;
+       s16             fp_offset;
+       s16             ra_offset;
+       unsigned int    sp_reg:4;
+       unsigned int    fp_reg:4;
+       unsigned int    ra_reg:4;
+       unsigned int    type:3;
+       unsigned int    signal:1;
+};
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ORC_TYPES_H */