Commit b5f184fb authored by Tiezhu Yang's avatar Tiezhu Yang Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Support MIPS unwinding and dwarf-regs 

Map perf APIs (perf_reg_name/get_arch_regstr/unwind__arch_reg_id) with
MIPS specific registers.

[ayan@wavecomp.com: repick this patch for unwinding userstack backtrace
by perf and libunwind on MIPS based CPU.]

[yangtiezhu@loongson.cn: Add sample_reg_masks[] to fix build error,
silence some checkpatch errors and warnings, and also separate the
original patches into two parts (MIPS kernel and perf tools) to merge
easily.]

The original patches:

https://lore.kernel.org/patchwork/patch/1126521/
https://lore.kernel.org/patchwork/patch/1126520/



Committer notes:

Do it as __perf_reg_name() to cope with:

  06701297 ("perf tools: Fix arm64 build error with gcc-11")

Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Archer Yan <ayan@wavecomp.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Jianlin Lv <Jianlin.Lv@arm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Juxin Gao <gaojuxin@loongson.cn>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Xuefeng Li <lixuefeng@loongson.cn>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org
Link: http://lore.kernel.org/lkml/1612409724-3516-3-git-send-email-yangtiezhu@loongson.cn


Signed-off-by: default avatarArcher Yan <ayan@wavecomp.com>
Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 84b77255

tools/perf/Makefile.config

+6 −0
Original line number Diff line number Diff line
@@ -87,6 +87,12 @@ ifeq ($(ARCH),s390) 
  CFLAGS += -fPIC -I$(OUTPUT)arch/s390/include/generated

endif



ifeq ($(ARCH),mips)

  NO_PERF_REGS := 0

  CFLAGS += -I../../arch/mips/include/uapi -I../../arch/mips/include/generated/uapi

  LIBUNWIND_LIBS = -lunwind -lunwind-mips

endif



ifeq ($(NO_PERF_REGS),0)

  $(call detected,CONFIG_PERF_REGS)

endif

tools/perf/arch/mips/Makefile

0 → 100644
+4 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

ifndef NO_DWARF

PERF_HAVE_DWARF_REGS := 1

endif

tools/perf/arch/mips/include/dwarf-regs-table.h

0 → 100644
+31 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * dwarf-regs-table.h : 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.

 *

 */



#ifdef DEFINE_DWARF_REGSTR_TABLE

#undef REG_DWARFNUM_NAME

#define REG_DWARFNUM_NAME(reg, idx)	[idx] = "$" #reg

static const char * const mips_regstr_tbl[] = {

	"$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",

	REG_DWARFNUM_NAME(hi, 64),

	REG_DWARFNUM_NAME(lo, 65),

};

#endif

tools/perf/arch/mips/include/perf_regs.h

0 → 100644
+84 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef ARCH_PERF_REGS_H

#define ARCH_PERF_REGS_H



#include <stdlib.h>

#include <linux/types.h>

#include <asm/perf_regs.h>



#define PERF_REGS_MAX PERF_REG_MIPS_MAX

#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 */

tools/perf/arch/mips/util/Build

0 → 100644
+3 −0
Original line number Diff line number Diff line 
perf-y += perf_regs.o

perf-$(CONFIG_DWARF) += dwarf-regs.o

perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o