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[PATCH 1/2] perf tools: Add support for MIPS userspace DWARF callchains.

To: linux-mips@linux-mips.org, ralf@linux-mips.org, Jiri Olsa <jolsa@redhat.com>
Subject: [PATCH 1/2] perf tools: Add support for MIPS userspace DWARF callchains.
From: David Daney <ddaney.cavm@gmail.com>
Date: Fri, 17 May 2013 12:00:37 -0700
Cc: linux-kernel@vger.kernel.org, Peter Zijlstra <a.p.zijlstra@chello.nl>, Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@redhat.com>, Arnaldo Carvalho de Melo <acme@ghostprotocols.net>, David Daney <david.daney@cavium.com>
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From: David Daney <david.daney@cavium.com>

Hack up the Makefile and add support code for mips unwinding
and dwarf-regs.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 tools/perf/Makefile                      |  3 ++
 tools/perf/arch/mips/Makefile            |  7 +++
 tools/perf/arch/mips/include/perf_regs.h | 84 ++++++++++++++++++++++++++++++++
 tools/perf/arch/mips/util/dwarf-regs.c   | 37 ++++++++++++++
 tools/perf/arch/mips/util/unwind.c       | 20 ++++++++
 5 files changed, 151 insertions(+)
 create mode 100644 tools/perf/arch/mips/Makefile
 create mode 100644 tools/perf/arch/mips/include/perf_regs.h
 create mode 100644 tools/perf/arch/mips/util/dwarf-regs.c
 create mode 100644 tools/perf/arch/mips/util/unwind.c

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 55b42b2..b1aaca2 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -505,6 +505,9 @@ ifeq ($(NO_PERF_REGS),0)
   ifeq ($(ARCH),x86)
     LIB_H += arch/x86/include/perf_regs.h
   endif
+  ifeq ($(ARCH),mips)
+    LIB_H += arch/mips/include/perf_regs.h
+  endif
 endif
 
 ifndef NO_LIBNUMA
diff --git a/tools/perf/arch/mips/Makefile b/tools/perf/arch/mips/Makefile
new file mode 100644
index 0000000..fe9b61e
--- /dev/null
+++ b/tools/perf/arch/mips/Makefile
@@ -0,0 +1,7 @@
+ifndef NO_DWARF
+PERF_HAVE_DWARF_REGS := 1
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
+endif
+ifndef NO_LIBUNWIND
+LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o
+endif
diff --git a/tools/perf/arch/mips/include/perf_regs.h 
b/tools/perf/arch/mips/include/perf_regs.h
new file mode 100644
index 0000000..a91b904
--- /dev/null
+++ b/tools/perf/arch/mips/include/perf_regs.h
@@ -0,0 +1,84 @@
+#ifndef ARCH_PERF_REGS_H
+#define ARCH_PERF_REGS_H
+
+#include <stdlib.h>
+#include "../../util/types.h"
+#include <asm/perf_regs.h>
+
+#define PERF_REG_IP PERF_REG_MIPS_PC
+#define PERF_REG_SP PERF_REG_MIPS_R29
+
+#define PERF_REGS_MASK ((1ULL << PERF_REG_MIPS_MAX) - 1)
+
+static inline const char *perf_reg_name(int id)
+{
+       switch (id) {
+       case PERF_REG_MIPS_PC:
+               return "PC";
+       case PERF_REG_MIPS_R1:
+               return "$1";
+       case PERF_REG_MIPS_R2:
+               return "$2";
+       case PERF_REG_MIPS_R3:
+               return "$3";
+       case PERF_REG_MIPS_R4:
+               return "$4";
+       case PERF_REG_MIPS_R5:
+               return "$5";
+       case PERF_REG_MIPS_R6:
+               return "$6";
+       case PERF_REG_MIPS_R7:
+               return "$7";
+       case PERF_REG_MIPS_R8:
+               return "$8";
+       case PERF_REG_MIPS_R9:
+               return "$9";
+       case PERF_REG_MIPS_R10:
+               return "$10";
+       case PERF_REG_MIPS_R11:
+               return "$11";
+       case PERF_REG_MIPS_R12:
+               return "$12";
+       case PERF_REG_MIPS_R13:
+               return "$13";
+       case PERF_REG_MIPS_R14:
+               return "$14";
+       case PERF_REG_MIPS_R15:
+               return "$15";
+       case PERF_REG_MIPS_R16:
+               return "$16";
+       case PERF_REG_MIPS_R17:
+               return "$17";
+       case PERF_REG_MIPS_R18:
+               return "$18";
+       case PERF_REG_MIPS_R19:
+               return "$19";
+       case PERF_REG_MIPS_R20:
+               return "$20";
+       case PERF_REG_MIPS_R21:
+               return "$21";
+       case PERF_REG_MIPS_R22:
+               return "$22";
+       case PERF_REG_MIPS_R23:
+               return "$23";
+       case PERF_REG_MIPS_R24:
+               return "$24";
+       case PERF_REG_MIPS_R25:
+               return "$25";
+
+       case PERF_REG_MIPS_R28:
+               return "$28";
+       case PERF_REG_MIPS_R29:
+               return "$29";
+       case PERF_REG_MIPS_R30:
+               return "$30";
+       case PERF_REG_MIPS_R31:
+               return "$31";
+       default:
+               break;
+       }
+       return NULL;
+}
+
+
+#endif /* ARCH_PERF_REGS_H */
diff --git a/tools/perf/arch/mips/util/dwarf-regs.c 
b/tools/perf/arch/mips/util/dwarf-regs.c
new file mode 100644
index 0000000..165e017
--- /dev/null
+++ b/tools/perf/arch/mips/util/dwarf-regs.c
@@ -0,0 +1,37 @@
+/*
+ * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
+ *
+ * Copyright (C) 2013 Cavium, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <libio.h>
+#include <dwarf-regs.h>
+
+static const char *mips_gpr_names[32] = {
+       "$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9",
+       "$10", "$11", "$12", "$13", "$14", "$15", "$16", "$17", "$18", "$19",
+       "$20", "$21", "$22", "$23", "$24", "$25", "$26", "$27", "$28", "$29",
+       "$30", "$31"
+};
+
+const char *get_arch_regstr(unsigned int n)
+{
+       if (n < 32)
+               return mips_gpr_names[n];
+       if (n == 64)
+               return "hi";
+       if (n == 65)
+               return "lo";
+       return NULL;
+}
diff --git a/tools/perf/arch/mips/util/unwind.c 
b/tools/perf/arch/mips/util/unwind.c
new file mode 100644
index 0000000..612949b
--- /dev/null
+++ b/tools/perf/arch/mips/util/unwind.c
@@ -0,0 +1,20 @@
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+
+int unwind__arch_reg_id(int regnum)
+{
+       switch (regnum) {
+       case UNW_MIPS_R1 ... UNW_MIPS_R25:
+               return regnum - UNW_MIPS_R1 + PERF_REG_MIPS_R1;
+       case UNW_MIPS_R28 ... UNW_MIPS_R31:
+               return regnum - UNW_MIPS_R28 + PERF_REG_MIPS_R28;
+       case UNW_MIPS_PC:
+               return PERF_REG_MIPS_PC;
+       default:
+               pr_err("unwind: invalid reg id %d\n", regnum);
+               return -EINVAL;
+       }
+}
-- 
1.7.11.7


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