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-rw-r--r--tools/perf/arch/arm64/util/dwarf-regs.c92
1 files changed, 92 insertions, 0 deletions
diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c
new file mode 100644
index 000000000..917b97d7c
--- /dev/null
+++ b/tools/perf/arch/arm64/util/dwarf-regs.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Mapping of DWARF debug register numbers into register names.
+ *
+ * Copyright (C) 2010 Will Deacon, ARM Ltd.
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <string.h>
+#include <dwarf-regs.h>
+#include <linux/ptrace.h> /* for struct user_pt_regs */
+#include <linux/stringify.h>
+
+struct pt_regs_dwarfnum {
+ const char *name;
+ unsigned int dwarfnum;
+};
+
+#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
+#define GPR_DWARFNUM_NAME(num) \
+ {.name = __stringify(%x##num), .dwarfnum = num}
+#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
+#define DWARFNUM2OFFSET(index) \
+ (index * sizeof((struct user_pt_regs *)0)->regs[0])
+
+/*
+ * Reference:
+ * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
+ */
+static const struct pt_regs_dwarfnum regdwarfnum_table[] = {
+ GPR_DWARFNUM_NAME(0),
+ GPR_DWARFNUM_NAME(1),
+ GPR_DWARFNUM_NAME(2),
+ GPR_DWARFNUM_NAME(3),
+ GPR_DWARFNUM_NAME(4),
+ GPR_DWARFNUM_NAME(5),
+ GPR_DWARFNUM_NAME(6),
+ GPR_DWARFNUM_NAME(7),
+ GPR_DWARFNUM_NAME(8),
+ GPR_DWARFNUM_NAME(9),
+ GPR_DWARFNUM_NAME(10),
+ GPR_DWARFNUM_NAME(11),
+ GPR_DWARFNUM_NAME(12),
+ GPR_DWARFNUM_NAME(13),
+ GPR_DWARFNUM_NAME(14),
+ GPR_DWARFNUM_NAME(15),
+ GPR_DWARFNUM_NAME(16),
+ GPR_DWARFNUM_NAME(17),
+ GPR_DWARFNUM_NAME(18),
+ GPR_DWARFNUM_NAME(19),
+ GPR_DWARFNUM_NAME(20),
+ GPR_DWARFNUM_NAME(21),
+ GPR_DWARFNUM_NAME(22),
+ GPR_DWARFNUM_NAME(23),
+ GPR_DWARFNUM_NAME(24),
+ GPR_DWARFNUM_NAME(25),
+ GPR_DWARFNUM_NAME(26),
+ GPR_DWARFNUM_NAME(27),
+ GPR_DWARFNUM_NAME(28),
+ GPR_DWARFNUM_NAME(29),
+ REG_DWARFNUM_NAME("%lr", 30),
+ REG_DWARFNUM_NAME("%sp", 31),
+ REG_DWARFNUM_END,
+};
+
+/**
+ * get_arch_regstr() - lookup register name from it's DWARF register number
+ * @n: the DWARF register number
+ *
+ * get_arch_regstr() returns the name of the register in struct
+ * regdwarfnum_table from it's DWARF register number. If the register is not
+ * found in the table, this returns NULL;
+ */
+const char *get_arch_regstr(unsigned int n)
+{
+ const struct pt_regs_dwarfnum *roff;
+ for (roff = regdwarfnum_table; roff->name != NULL; roff++)
+ if (roff->dwarfnum == n)
+ return roff->name;
+ return NULL;
+}
+
+int regs_query_register_offset(const char *name)
+{
+ const struct pt_regs_dwarfnum *roff;
+
+ for (roff = regdwarfnum_table; roff->name != NULL; roff++)
+ if (!strcmp(roff->name, name))
+ return DWARFNUM2OFFSET(roff->dwarfnum);
+ return -EINVAL;
+}