Re: [PATCH] tools/perf: Add basic support for LoongArch

From: Jeff Xie
Date: Fri Mar 31 2023 - 09:55:31 EST

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Hi,

Currently, it seems that only LoongArch does not support libdw.
However, libdw has many advantages,
and I hope that LoongArch will consider supporting it. In my opinion,
libdw has at least the following advantages:

Comprehensive DWARF support: The libdw library provides comprehensive
support for the DWARF debugging format.
DWARF is the most commonly used debugging information format on the
Linux platform, featuring a rich set of capabilities
that can describe the complex relationship between source code and
compiled executable files. libdw can parse all DWARF features,
including type information, line numbers, local and global variables,
macro definitions, etc., enabling perf to provide detailed
source-code-level performance data.

Performance and memory usage: The libdw library was designed with
performance and memory usage in mind.
It uses efficient algorithms and data structures to parse and store
DWARF information, thus reducing performance overhead and memory
usage.
This is particularly important for performance analysis tools like
perf, which need to parse large amounts of debugging information at
runtime and minimize the impact on the target program being analyzed.

Concise API: The libdw library provides a concise, easy-to-use API
that allows developers to easily integrate
it into applications like perf. The API follows C programming
conventions and can seamlessly cooperate with other

I hope Loonarch can consider supporting libdw in LoongArch, as it
would be of great help to our work.

On Tue, Mar 7, 2023 at 10:21 AM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
>
> Add basic support for LoongArch, which is very similar to the MIPS
> version.
>
> Signed-off-by: Ming Wang <wangming01@xxxxxxxxxxx>
> Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> ---
> .../loongarch/include/uapi/asm/perf_regs.h | 40 +++++++++
> .../arch/loongarch/include/uapi/asm/unistd.h | 9 ++
> tools/perf/Makefile.config | 7 ++
> tools/perf/arch/loongarch/Build | 1 +
> tools/perf/arch/loongarch/Makefile | 27 ++++++
> .../arch/loongarch/annotate/instructions.c | 45 ++++++++++
> .../loongarch/entry/syscalls/mksyscalltbl | 61 +++++++++++++
> .../arch/loongarch/include/dwarf-regs-table.h | 16 ++++
> tools/perf/arch/loongarch/include/perf_regs.h | 88 +++++++++++++++++++
> tools/perf/arch/loongarch/util/Build | 4 +
> tools/perf/arch/loongarch/util/dwarf-regs.c | 25 ++++++
> tools/perf/arch/loongarch/util/perf_regs.c | 6 ++
> .../arch/loongarch/util/unwind-libunwind.c | 82 +++++++++++++++++
> tools/perf/util/annotate.c | 8 ++
> tools/perf/util/dwarf-regs.c | 7 ++
> tools/perf/util/env.c | 2 +
> tools/perf/util/genelf.h | 3 +
> tools/perf/util/syscalltbl.c | 4 +
> 18 files changed, 435 insertions(+)
> create mode 100644 tools/arch/loongarch/include/uapi/asm/perf_regs.h
> create mode 100644 tools/arch/loongarch/include/uapi/asm/unistd.h
> create mode 100644 tools/perf/arch/loongarch/Build
> create mode 100644 tools/perf/arch/loongarch/Makefile
> create mode 100644 tools/perf/arch/loongarch/annotate/instructions.c
> create mode 100755 tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
> create mode 100644 tools/perf/arch/loongarch/include/dwarf-regs-table.h
> create mode 100644 tools/perf/arch/loongarch/include/perf_regs.h
> create mode 100644 tools/perf/arch/loongarch/util/Build
> create mode 100644 tools/perf/arch/loongarch/util/dwarf-regs.c
> create mode 100644 tools/perf/arch/loongarch/util/perf_regs.c
> create mode 100644 tools/perf/arch/loongarch/util/unwind-libunwind.c
>
> diff --git a/tools/arch/loongarch/include/uapi/asm/perf_regs.h b/tools/arch/loongarch/include/uapi/asm/perf_regs.h
> new file mode 100644
> index 000000000000..9943d418e01d
> --- /dev/null
> +++ b/tools/arch/loongarch/include/uapi/asm/perf_regs.h
> @@ -0,0 +1,40 @@
> +/* 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 */
> diff --git a/tools/arch/loongarch/include/uapi/asm/unistd.h b/tools/arch/loongarch/include/uapi/asm/unistd.h
> new file mode 100644
> index 000000000000..0c743344e92d
> --- /dev/null
> +++ b/tools/arch/loongarch/include/uapi/asm/unistd.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> + */
> +
> +#define __ARCH_WANT_SYS_CLONE
> +#define __ARCH_WANT_SYS_CLONE3
> +
> +#include <asm-generic/unistd.h>
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 3519a0139026..89230ae68721 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -80,6 +80,13 @@ 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
> diff --git a/tools/perf/arch/loongarch/Build b/tools/perf/arch/loongarch/Build
> new file mode 100644
> index 000000000000..e4e5f33c84d8
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/Build
> @@ -0,0 +1 @@
> +perf-y += util/
> diff --git a/tools/perf/arch/loongarch/Makefile b/tools/perf/arch/loongarch/Makefile
> new file mode 100644
> index 000000000000..1229157b09e1
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/Makefile
> @@ -0,0 +1,27 @@
> +# 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)
> diff --git a/tools/perf/arch/loongarch/annotate/instructions.c b/tools/perf/arch/loongarch/annotate/instructions.c
> new file mode 100644
> index 000000000000..ab21bf122135
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/annotate/instructions.c
> @@ -0,0 +1,45 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Perf annotate functions.
> + *
> + * Copyright (C) 2020-2023 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;
> +}
> diff --git a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
> new file mode 100755
> index 000000000000..c52156f7204d
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl
> @@ -0,0 +1,61 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Generate system call table for perf. Derived from
> +# powerpc script.
> +#
> +# Author(s): Ming Wang <wangming01@xxxxxxxxxxx>
> +# Author(s): Huacai Chen <chenhuacai@xxxxxxxxxxx>
> +# Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> +
> +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
> diff --git a/tools/perf/arch/loongarch/include/dwarf-regs-table.h b/tools/perf/arch/loongarch/include/dwarf-regs-table.h
> new file mode 100644
> index 000000000000..4b2291034668
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/include/dwarf-regs-table.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * dwarf-regs-table.h : Mapping of DWARF debug register numbers into
> + * register names.
> + *
> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> + */
> +
> +#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
> diff --git a/tools/perf/arch/loongarch/include/perf_regs.h b/tools/perf/arch/loongarch/include/perf_regs.h
> new file mode 100644
> index 000000000000..82d531dcd90f
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/include/perf_regs.h
> @@ -0,0 +1,88 @@
> +/* 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 "$31";
> + default:
> + break;
> + }
> + return NULL;
> +}
> +
> +#endif /* ARCH_PERF_REGS_H */
> diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongarch/util/Build
> new file mode 100644
> index 000000000000..fab48acf21c5
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/util/Build
> @@ -0,0 +1,4 @@
> +perf-y += perf_regs.o
> +
> +perf-$(CONFIG_DWARF) += dwarf-regs.o
> +perf-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
> diff --git a/tools/perf/arch/loongarch/util/dwarf-regs.c b/tools/perf/arch/loongarch/util/dwarf-regs.c
> new file mode 100644
> index 000000000000..7db14897a384
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/util/dwarf-regs.c
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
> + *
> + * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> + *
> + * Derived from MIPS:
> + * Copyright (C) 2013 Cavium, Inc.
> + */
> +
> +#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];
> +}
> diff --git a/tools/perf/arch/loongarch/util/perf_regs.c b/tools/perf/arch/loongarch/util/perf_regs.c
> new file mode 100644
> index 000000000000..2833e101a7c6
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/util/perf_regs.c
> @@ -0,0 +1,6 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "../../../util/perf_regs.h"
> +
> +const struct sample_reg sample_reg_masks[] = {
> + SMPL_REG_END
> +};
> diff --git a/tools/perf/arch/loongarch/util/unwind-libunwind.c b/tools/perf/arch/loongarch/util/unwind-libunwind.c
> new file mode 100644
> index 000000000000..f693167b86ef
> --- /dev/null
> +++ b/tools/perf/arch/loongarch/util/unwind-libunwind.c
> @@ -0,0 +1,82 @@
> +// 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_LOONGARCH64_R1:
> + return PERF_REG_LOONGARCH_R1;
> + case UNW_LOONGARCH64_R2:
> + return PERF_REG_LOONGARCH_R2;
> + case UNW_LOONGARCH64_R3:
> + return PERF_REG_LOONGARCH_R3;
> + case UNW_LOONGARCH64_R4:
> + return PERF_REG_LOONGARCH_R4;
> + case UNW_LOONGARCH64_R5:
> + return PERF_REG_LOONGARCH_R5;
> + case UNW_LOONGARCH64_R6:
> + return PERF_REG_LOONGARCH_R6;
> + case UNW_LOONGARCH64_R7:
> + return PERF_REG_LOONGARCH_R7;
> + case UNW_LOONGARCH64_R8:
> + return PERF_REG_LOONGARCH_R8;
> + case UNW_LOONGARCH64_R9:
> + return PERF_REG_LOONGARCH_R9;
> + case UNW_LOONGARCH64_R10:
> + return PERF_REG_LOONGARCH_R10;
> + case UNW_LOONGARCH64_R11:
> + return PERF_REG_LOONGARCH_R11;
> + case UNW_LOONGARCH64_R12:
> + return PERF_REG_LOONGARCH_R12;
> + case UNW_LOONGARCH64_R13:
> + return PERF_REG_LOONGARCH_R13;
> + case UNW_LOONGARCH64_R14:
> + return PERF_REG_LOONGARCH_R14;
> + case UNW_LOONGARCH64_R15:
> + return PERF_REG_LOONGARCH_R15;
> + case UNW_LOONGARCH64_R16:
> + return PERF_REG_LOONGARCH_R16;
> + case UNW_LOONGARCH64_R17:
> + return PERF_REG_LOONGARCH_R17;
> + case UNW_LOONGARCH64_R18:
> + return PERF_REG_LOONGARCH_R18;
> + case UNW_LOONGARCH64_R19:
> + return PERF_REG_LOONGARCH_R19;
> + case UNW_LOONGARCH64_R20:
> + return PERF_REG_LOONGARCH_R20;
> + case UNW_LOONGARCH64_R21:
> + return PERF_REG_LOONGARCH_R21;
> + case UNW_LOONGARCH64_R22:
> + return PERF_REG_LOONGARCH_R22;
> + case UNW_LOONGARCH64_R23:
> + return PERF_REG_LOONGARCH_R23;
> + case UNW_LOONGARCH64_R24:
> + return PERF_REG_LOONGARCH_R24;
> + case UNW_LOONGARCH64_R25:
> + return PERF_REG_LOONGARCH_R25;
> + case UNW_LOONGARCH64_R26:
> + return PERF_REG_LOONGARCH_R26;
> + case UNW_LOONGARCH64_R27:
> + return PERF_REG_LOONGARCH_R27;
> + case UNW_LOONGARCH64_R28:
> + return PERF_REG_LOONGARCH_R28;
> + case UNW_LOONGARCH64_R29:
> + return PERF_REG_LOONGARCH_R29;
> + case UNW_LOONGARCH64_R30:
> + return PERF_REG_LOONGARCH_R30;
> + case UNW_LOONGARCH64_R31:
> + return PERF_REG_LOONGARCH_R31;
> + case UNW_LOONGARCH64_PC:
> + return PERF_REG_LOONGARCH_PC;
> + default:
> + pr_err("unwind: invalid reg id %d\n", regnum);
> + return -EINVAL;
> + }
> +
> + return -EINVAL;
> +}
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index db475e44f42f..0cc7710f32da 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -149,6 +149,7 @@ static int arch__associate_ins_ops(struct arch* arch, const char *name, struct i
> #include "arch/arm/annotate/instructions.c"
> #include "arch/arm64/annotate/instructions.c"
> #include "arch/csky/annotate/instructions.c"
> +#include "arch/loongarch/annotate/instructions.c"
> #include "arch/mips/annotate/instructions.c"
> #include "arch/x86/annotate/instructions.c"
> #include "arch/powerpc/annotate/instructions.c"
> @@ -211,6 +212,13 @@ static struct arch architectures[] = {
> .comment_char = '#',
> },
> },
> + {
> + .name = "loongarch",
> + .init = loongarch__annotate_init,
> + .objdump = {
> + .comment_char = '#',
> + },
> + },
> };
>
> static void ins__delete(struct ins_operands *ops)
> diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
> index 3fa4486742cd..69cfaa5953bf 100644
> --- a/tools/perf/util/dwarf-regs.c
> +++ b/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"
> @@ -25,6 +29,7 @@
> #include "../arch/sparc/include/dwarf-regs-table.h"
> #include "../arch/xtensa/include/dwarf-regs-table.h"
> #include "../arch/mips/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)
>
> @@ -56,6 +61,8 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine)
> return __get_dwarf_regstr(xtensa_regstr_tbl, n);
> case EM_MIPS:
> return __get_dwarf_regstr(mips_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);
> }
> diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> index 5b8cf6a421a4..0d5d40cb997b 100644
> --- a/tools/perf/util/env.c
> +++ b/tools/perf/util/env.c
> @@ -435,6 +435,8 @@ 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;
> }
> diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
> index 6af062d1c452..5f18d20ea903 100644
> --- a/tools/perf/util/genelf.h
> +++ b/tools/perf/util/genelf.h
> @@ -43,6 +43,9 @@ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_ent
> #elif defined(__riscv) && __riscv_xlen == 64
> #define GEN_ELF_ARCH EM_RISCV
> #define GEN_ELF_CLASS ELFCLASS64
> +#elif defined(__loongarch__)
> +#define GEN_ELF_ARCH EM_LOONGARCH
> +#define GEN_ELF_CLASS ELFCLASS64
> #else
> #error "unsupported architecture"
> #endif
> diff --git a/tools/perf/util/syscalltbl.c b/tools/perf/util/syscalltbl.c
> index a2e906858891..313eccef6cb4 100644
> --- a/tools/perf/util/syscalltbl.c
> +++ b/tools/perf/util/syscalltbl.c
> @@ -38,6 +38,10 @@ static const char **syscalltbl_native = syscalltbl_arm64;
> #include <asm/syscalls_n64.c>
> const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
> static const char **syscalltbl_native = syscalltbl_mips_n64;
> +#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 {
> --
> 2.39.1
>

--
Thanks,
JeffXie

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