ARM: 6198/1: perf probe: Add ARM DWARF register number mappings

This patch adds mappings from DWARF register numbers to the register
names used by the ARM `Regs and Stack Access API'.

Cc: Jean Pihet <jpihet@mvista.com>
Tested-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/tools/perf/arch/arm/Makefile b/tools/perf/arch/arm/Makefile
new file mode 100644 (file)
index 0000000..15130b5
--- /dev/null
+++ b/tools/perf/arch/arm/Makefile
@@ -0,0 +1,4 @@
+ifndef NO_DWARF
+PERF_HAVE_DWARF_REGS := 1
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
+endif

diff --git a/tools/perf/arch/arm/util/dwarf-regs.c b/tools/perf/arch/arm/util/dwarf-regs.c
new file mode 100644 (file)
index 0000000..fff6450
--- /dev/null
+++ b/tools/perf/arch/arm/util/dwarf-regs.c
@@ -0,0 +1,64 @@
+/*
+ * Mapping of DWARF debug register numbers into register names.
+ *
+ * Copyright (C) 2010 Will Deacon, ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <libio.h>
+#include <dwarf-regs.h>
+
+struct pt_regs_dwarfnum {
+       const char *name;
+       unsigned int dwarfnum;
+};
+
+#define STR(s) #s
+#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}
+#define GPR_DWARFNUM_NAME(num) \
+       {.name = STR(%r##num), .dwarfnum = num}
+#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
+
+/*
+ * Reference:
+ * http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040a/IHI0040A_aadwarf.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),
+       REG_DWARFNUM_NAME("%fp", 11),
+       REG_DWARFNUM_NAME("%ip", 12),
+       REG_DWARFNUM_NAME("%sp", 13),
+       REG_DWARFNUM_NAME("%lr", 14),
+       REG_DWARFNUM_NAME("%pc", 15),
+       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;
+}