tools/perf: Add basic support for LoongArch

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

--------------------------------
Signed-off-by: NHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: NMing Wang <wangming01@loongson.cn>
Change-Id: Id8769bae9287344689add6b523c4c49f7391354f
(cherry picked from commit 4efd0de6)

scripts/Makefile

@@ -24,10 +24,17 @@ HOSTCFLAGS_extract-cert.o = $(CRYPTO_CFLAGS)
 HOSTLDLIBS_extract-cert = $(CRYPTO_LIBS)
 
 ifdef CONFIG_UNWINDER_ORC
+# Additional ARCH settings for x86
 ifeq ($(ARCH),x86_64)
 ARCH := x86
 endif
-HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/x86/include
+
+# Additional ARCH settings for loongarch
+ifeq ($(ARCH),loongarch64)
+ARCH := loongarch
+endif
+
+HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/$(ARCH)/include
 HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
 HOSTLDLIBS_sorttable = -lpthread
 endif

tools/arch/loongarch/include/uapi/asm/perf_regs.h

+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_LOONGARCH_PERF_REGS_H
+#define _ASM_LOONGARCH_PERF_REGS_H
+
+enum perf_event_loongarch_regs {
+	PERF_REG_LOONGARCH_PC,
+	PERF_REG_LOONGARCH_R1,
+	PERF_REG_LOONGARCH_R2,
+	PERF_REG_LOONGARCH_R3,
+	PERF_REG_LOONGARCH_R4,
+	PERF_REG_LOONGARCH_R5,
+	PERF_REG_LOONGARCH_R6,
+	PERF_REG_LOONGARCH_R7,
+	PERF_REG_LOONGARCH_R8,
+	PERF_REG_LOONGARCH_R9,
+	PERF_REG_LOONGARCH_R10,
+	PERF_REG_LOONGARCH_R11,
+	PERF_REG_LOONGARCH_R12,
+	PERF_REG_LOONGARCH_R13,
+	PERF_REG_LOONGARCH_R14,
+	PERF_REG_LOONGARCH_R15,
+	PERF_REG_LOONGARCH_R16,
+	PERF_REG_LOONGARCH_R17,
+	PERF_REG_LOONGARCH_R18,
+	PERF_REG_LOONGARCH_R19,
+	PERF_REG_LOONGARCH_R20,
+	PERF_REG_LOONGARCH_R21,
+	PERF_REG_LOONGARCH_R22,
+	PERF_REG_LOONGARCH_R23,
+	PERF_REG_LOONGARCH_R24,
+	PERF_REG_LOONGARCH_R25,
+	PERF_REG_LOONGARCH_R26,
+	PERF_REG_LOONGARCH_R27,
+	PERF_REG_LOONGARCH_R28,
+	PERF_REG_LOONGARCH_R29,
+	PERF_REG_LOONGARCH_R30,
+	PERF_REG_LOONGARCH_R31,
+	PERF_REG_LOONGARCH_MAX = PERF_REG_LOONGARCH_R31 + 1,
+};
+#endif /* _ASM_LOONGARCH_PERF_REGS_H */

tools/arch/loongarch/include/uapi/asm/unistd.h

+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2020-2021 Loongson Technology Corporation Limited
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define __ARCH_WANT_NEW_STAT
+#define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_CLONE3
+
+#include <asm-generic/unistd.h>

tools/perf/Makefile.config

@@ -74,6 +74,13 @@ ifeq ($(SRCARCH),arm64)
   LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
 endif
 
+ifeq ($(SRCARCH),loongarch)
+  NO_PERF_REGS := 0
+  CFLAGS += -I$(OUTPUT)arch/loongarch/include/generated
+  CFLAGS += -I$(OUTPUT)../arch/loongarch/include/uapi
+  LIBUNWIND_LIBS = -lunwind -lunwind-loongarch
+endif
+
 ifeq ($(SRCARCH),riscv)
   NO_PERF_REGS := 0
 endif

tools/perf/arch/loongarch/Build

+perf-y += util/

tools/perf/arch/loongarch/Makefile

+# SPDX-License-Identifier: GPL-2.0
+ifndef NO_DWARF
+PERF_HAVE_DWARF_REGS := 1
+endif
+PERF_HAVE_JITDUMP := 1
+
+#
+# Syscall table generation for perf
+#
+
+out    := $(OUTPUT)arch/loongarch/include/generated/asm
+header := $(out)/syscalls_64.c
+incpath := $(srctree)/tools
+sysdef := $(srctree)/tools/arch/loongarch/include/uapi/asm/unistd.h
+sysprf := $(srctree)/tools/perf/arch/loongarch/entry/syscalls/
+systbl := $(sysprf)/mksyscalltbl
+
+# Create output directory if not already present
+_dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
+
+$(header): $(sysdef) $(systbl)
+	$(Q)$(SHELL) '$(systbl)' '$(CC)' '$(HOSTCC)' $(incpath) $(sysdef) > $@
+
+clean::
+	$(call QUIET_CLEAN, loongarch) $(RM) $(header)
+
+archheaders: $(header)

tools/perf/arch/loongarch/annotate/instructions.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Perf annotate functions.
+ *
+ * Copyright (C) 2020 Loongson Technology Corporation Limited
+ */
+
+static
+struct ins_ops *loongarch__associate_ins_ops(struct arch *arch, const char *name)
+{
+	struct ins_ops *ops = NULL;
+
+	if (!strncmp(name, "beqz", 4) ||
+	    !strncmp(name, "bnez", 4) ||
+	    !strncmp(name, "beq", 3) ||
+	    !strncmp(name, "bne", 3) ||
+	    !strncmp(name, "blt", 3) ||
+	    !strncmp(name, "bge", 3) ||
+	    !strncmp(name, "bltu", 4) ||
+	    !strncmp(name, "bgeu", 4) ||
+	    !strncmp(name, "bl", 2))
+		ops = &call_ops;
+	else if (!strncmp(name, "jirl", 4))
+		ops = &ret_ops;
+	else if (name[0] == 'b')
+		ops = &jump_ops;
+	else
+		return NULL;
+
+	arch__associate_ins_ops(arch, name, ops);
+
+	return ops;
+}
+
+static
+int loongarch__annotate_init(struct arch *arch, char *cpuid __maybe_unused)
+{
+	if (!arch->initialized) {
+		arch->associate_instruction_ops = loongarch__associate_ins_ops;
+		arch->initialized = true;
+		arch->objdump.comment_char = '#';
+	}
+
+	return 0;
+}

tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl

+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Generate system call table for perf. Derived from
+# powerpc script.
+#
+# Copyright (C) 2020 Loongson Technology Co., Ltd.
+# Author(s):  Ming Wang <wangming01@loongson.cn>
+
+gcc=$1
+hostcc=$2
+incpath=$3
+input=$4
+
+if ! test -r $input; then
+	echo "Could not read input file" >&2
+	exit 1
+fi
+
+create_table_from_c()
+{
+	local sc nr last_sc
+
+	create_table_exe=`mktemp ${TMPDIR:-/tmp}/create-table-XXXXXX`
+
+	{
+
+	cat <<-_EoHEADER
+		#include <stdio.h>
+		#include "$input"
+		int main(int argc, char *argv[])
+		{
+	_EoHEADER
+
+	while read sc nr; do
+		printf "%s\n" "	printf(\"\\t[%d] = \\\"$sc\\\",\\n\", $nr);"
+		last_sc=$nr
+	done
+
+	printf "%s\n" "	printf(\"#define SYSCALLTBL_LOONGARCH_MAX_ID %d\\n\", $last_sc);"
+	printf "}\n"
+
+	} | $hostcc -I $incpath/include/uapi -o $create_table_exe -x c -
+
+	$create_table_exe
+
+	rm -f $create_table_exe
+}
+
+create_table()
+{
+	echo "static const char *syscalltbl_loongarch[] = {"
+	create_table_from_c
+	echo "};"
+}
+
+$gcc -E -dM -x c  -I $incpath/include/uapi $input	       \
+	|sed -ne 's/^#define __NR_//p' \
+	|sort -t' ' -k2 -n \
+	|create_table

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

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * dwarf-regs-table.h : Mapping of DWARF debug register numbers into
+ * register names.
+ *
+ * Copyright (C) 2020 Loongson Technology Corporation Limited
+ *
+ * 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
+static const char * const loongarch_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",
+};
+#endif

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

+/* 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_LOONGARCH_MAX
+#define PERF_REG_IP PERF_REG_LOONGARCH_PC
+#define PERF_REG_SP PERF_REG_LOONGARCH_R3
+
+#define PERF_REGS_MASK ((1ULL << PERF_REG_LOONGARCH_MAX) - 1)
+
+static inline const char *__perf_reg_name(int id)
+{
+	switch (id) {
+	case PERF_REG_LOONGARCH_PC:
+		return "PC";
+	case PERF_REG_LOONGARCH_R1:
+		return "$1";
+	case PERF_REG_LOONGARCH_R2:
+		return "$2";
+	case PERF_REG_LOONGARCH_R3:
+		return "$3";
+	case PERF_REG_LOONGARCH_R4:
+		return "$4";
+	case PERF_REG_LOONGARCH_R5:
+		return "$5";
+	case PERF_REG_LOONGARCH_R6:
+		return "$6";
+	case PERF_REG_LOONGARCH_R7:
+		return "$7";
+	case PERF_REG_LOONGARCH_R8:
+		return "$8";
+	case PERF_REG_LOONGARCH_R9:
+		return "$9";
+	case PERF_REG_LOONGARCH_R10:
+		return "$10";
+	case PERF_REG_LOONGARCH_R11:
+		return "$11";
+	case PERF_REG_LOONGARCH_R12:
+		return "$12";
+	case PERF_REG_LOONGARCH_R13:
+		return "$13";
+	case PERF_REG_LOONGARCH_R14:
+		return "$14";
+	case PERF_REG_LOONGARCH_R15:
+		return "$15";
+	case PERF_REG_LOONGARCH_R16:
+		return "$16";
+	case PERF_REG_LOONGARCH_R17:
+		return "$17";
+	case PERF_REG_LOONGARCH_R18:
+		return "$18";
+	case PERF_REG_LOONGARCH_R19:
+		return "$19";
+	case PERF_REG_LOONGARCH_R20:
+		return "$20";
+	case PERF_REG_LOONGARCH_R21:
+		return "$21";
+	case PERF_REG_LOONGARCH_R22:
+		return "$22";
+	case PERF_REG_LOONGARCH_R23:
+		return "$23";
+	case PERF_REG_LOONGARCH_R24:
+		return "$24";
+	case PERF_REG_LOONGARCH_R25:
+		return "$25";
+	case PERF_REG_LOONGARCH_R26:
+		return "$26";
+	case PERF_REG_LOONGARCH_R27:
+		return "$27";
+	case PERF_REG_LOONGARCH_R28:
+		return "$28";
+	case PERF_REG_LOONGARCH_R29:
+		return "$29";
+	case PERF_REG_LOONGARCH_R30:
+		return "$30";
+	case PERF_REG_LOONGARCH_R31:
+		return "$31";
+	default:
+		break;
+	}
+	return NULL;
+}
+
+#endif /* ARCH_PERF_REGS_H */

tools/perf/arch/loongarch/util/Build

+perf-y += perf_regs.o
+
+perf-$(CONFIG_DWARF)     += dwarf-regs.o
+perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o

tools/perf/arch/loongarch/util/dwarf-regs.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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 <stdio.h>
+#include <dwarf-regs.h>
+
+static const char *loongarch_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)
+{
+	n %= 32;
+	return loongarch_gpr_names[n];
+}

tools/perf/arch/loongarch/util/perf_regs.c

+// SPDX-License-Identifier: GPL-2.0
+#include "../../../util/perf_regs.h"
+
+const struct sample_reg sample_reg_masks[] = {
+	SMPL_REG_END
+};

tools/perf/arch/loongarch/util/unwind-libunwind.c

+// SPDX-License-Identifier: GPL-2.0
+
+#include <errno.h>
+#include <libunwind.h>
+#include "perf_regs.h"
+#include "../../util/unwind.h"
+#include "util/debug.h"
+
+int libunwind__arch_reg_id(int regnum)
+{
+	switch (regnum) {
+	case UNW_LOONGARCH_R1:
+		return PERF_REG_LOONGARCH_R1;
+	case UNW_LOONGARCH_R2:
+		return PERF_REG_LOONGARCH_R2;
+	case UNW_LOONGARCH_R3:
+		return PERF_REG_LOONGARCH_R3;
+	case UNW_LOONGARCH_R4:
+		return PERF_REG_LOONGARCH_R4;
+	case UNW_LOONGARCH_R5:
+		return PERF_REG_LOONGARCH_R5;
+	case UNW_LOONGARCH_R6:
+		return PERF_REG_LOONGARCH_R6;
+	case UNW_LOONGARCH_R7:
+		return PERF_REG_LOONGARCH_R7;
+	case UNW_LOONGARCH_R8:
+		return PERF_REG_LOONGARCH_R8;
+	case UNW_LOONGARCH_R9:
+		return PERF_REG_LOONGARCH_R9;
+	case UNW_LOONGARCH_R10:
+		return PERF_REG_LOONGARCH_R10;
+	case UNW_LOONGARCH_R11:
+		return PERF_REG_LOONGARCH_R11;
+	case UNW_LOONGARCH_R12:
+		return PERF_REG_LOONGARCH_R12;
+	case UNW_LOONGARCH_R13:
+		return PERF_REG_LOONGARCH_R13;
+	case UNW_LOONGARCH_R14:
+		return PERF_REG_LOONGARCH_R14;
+	case UNW_LOONGARCH_R15:
+		return PERF_REG_LOONGARCH_R15;
+	case UNW_LOONGARCH_R16:
+		return PERF_REG_LOONGARCH_R16;
+	case UNW_LOONGARCH_R17:
+		return PERF_REG_LOONGARCH_R17;
+	case UNW_LOONGARCH_R18:
+		return PERF_REG_LOONGARCH_R18;
+	case UNW_LOONGARCH_R19:
+		return PERF_REG_LOONGARCH_R19;
+	case UNW_LOONGARCH_R20:
+		return PERF_REG_LOONGARCH_R20;
+	case UNW_LOONGARCH_R21:
+		return PERF_REG_LOONGARCH_R21;
+	case UNW_LOONGARCH_R22:
+		return PERF_REG_LOONGARCH_R22;
+	case UNW_LOONGARCH_R23:
+		return PERF_REG_LOONGARCH_R23;
+	case UNW_LOONGARCH_R24:
+		return PERF_REG_LOONGARCH_R24;
+	case UNW_LOONGARCH_R25:
+		return PERF_REG_LOONGARCH_R25;
+	case UNW_LOONGARCH_R26:
+		return PERF_REG_LOONGARCH_R26;
+	case UNW_LOONGARCH_R27:
+		return PERF_REG_LOONGARCH_R27;
+	case UNW_LOONGARCH_R28:
+		return PERF_REG_LOONGARCH_R28;
+	case UNW_LOONGARCH_R29:
+		return PERF_REG_LOONGARCH_R29;
+	case UNW_LOONGARCH_R30:
+		return PERF_REG_LOONGARCH_R30;
+	case UNW_LOONGARCH_R31:
+		return PERF_REG_LOONGARCH_R31;
+	case UNW_LOONGARCH_PC:
+		return PERF_REG_LOONGARCH_PC;
+	default:
+		pr_err("unwind: invalid reg id %d\n", regnum);
+		return -EINVAL;
+	}
+
+	return -EINVAL;
+}

tools/perf/util/annotate.c

@@ -156,6 +156,7 @@ static int arch__associate_ins_ops(struct arch* arch, const char *name, struct i
 #include "arch/powerpc/annotate/instructions.c"
 #include "arch/s390/annotate/instructions.c"
 #include "arch/sparc/annotate/instructions.c"
+#include "arch/loongarch/annotate/instructions.c"
 
 static struct arch architectures[] = {
 	{
@@ -205,6 +206,13 @@ static struct arch architectures[] = {
 			.comment_char = '#',
 		},
 	},
+	{
+		.name = "loongarch",
+		.init = loongarch__annotate_init,
+		.objdump = {
+			.comment_char = '#',
+		},
+	},
 };
 
 static void ins__delete(struct ins_operands *ops)

tools/perf/util/dwarf-regs.c

@@ -14,6 +14,10 @@
 #define EM_AARCH64	183  /* ARM 64 bit */
 #endif
 
+#ifndef EM_LOONGARCH
+#define EM_LOONGARCH	258 /* LoongArch */
+#endif
+
 /* Define const char * {arch}_register_tbl[] */
 #define DEFINE_DWARF_REGSTR_TABLE
 #include "../arch/x86/include/dwarf-regs-table.h"
@@ -24,6 +28,7 @@
 #include "../arch/s390/include/dwarf-regs-table.h"
 #include "../arch/sparc/include/dwarf-regs-table.h"
 #include "../arch/xtensa/include/dwarf-regs-table.h"
+#include "../arch/loongarch/include/dwarf-regs-table.h"
 
 #define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
 
@@ -53,6 +58,8 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine)
 		return __get_dwarf_regstr(sparc_regstr_tbl, n);
 	case EM_XTENSA:
 		return __get_dwarf_regstr(xtensa_regstr_tbl, n);
+	case EM_LOONGARCH:
+		return __get_dwarf_regstr(loongarch_regstr_tbl, n);
 	default:
 		pr_err("ELF MACHINE %x is not supported.\n", machine);
 	}

tools/perf/util/env.c

@@ -347,6 +347,8 @@ static const char *normalize_arch(char *arch)
 		return "mips";
 	if (!strncmp(arch, "sh", 2) && isdigit(arch[2]))
 		return "sh";
+	if (!strncmp(arch, "loongarch", 9))
+		return "loongarch";
 
 	return arch;
 }

tools/perf/util/genelf.h

@@ -38,6 +38,9 @@ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_ent
 #elif defined(__s390x__)
 #define GEN_ELF_ARCH	EM_S390
 #define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__loongarch__)
+#define GEN_ELF_ARCH	EM_LOONGARCH
+#define GEN_ELF_CLASS	ELFCLASS64
 #else
 #error "unsupported architecture"
 #endif

tools/perf/util/syscalltbl.c

@@ -34,6 +34,10 @@ static const char **syscalltbl_native = syscalltbl_powerpc_32;
 #include <asm/syscalls.c>
 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
 static const char **syscalltbl_native = syscalltbl_arm64;
+#elif defined(__loongarch__)
+#include <asm/syscalls.c>
+const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
+static const char **syscalltbl_native = syscalltbl_loongarch;
 #endif
 
 struct syscall {

tools/scripts/Makefile.arch

@@ -4,7 +4,8 @@ HOSTARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
                                   -e /arm64/!s/arm.*/arm/ -e s/sa110/arm/ \
                                   -e s/s390x/s390/ -e s/parisc64/parisc/ \
                                   -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
+                                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
+				  -e s/loongarch.*/loongarch/)
 
 ifndef ARCH
 ARCH := $(HOSTARCH)
@@ -33,6 +34,15 @@ ifeq ($(ARCH),sh64)
        SRCARCH := sh
 endif
 
+# Additional ARCH settings for loongarch
+ifeq ($(ARCH),loongarch32)
+       SRCARCH := loongarch
+endif
+
+ifeq ($(ARCH),loongarch64)
+       SRCARCH := loongarch
+endif
+
 LP64 := $(shell echo __LP64__ | ${CC} ${CFLAGS} -E -x c - | tail -n 1)
 ifeq ($(LP64), 1)
   IS_64_BIT := 1