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

From: Huacai Chen
Date: Mon Apr 10 2023 - 07:33:31 EST

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Hi, Jeff,

On Fri, Mar 31, 2023 at 9:55 PM Jeff Xie <xiehuan09@xxxxxxxxx> wrote:
>
> 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.
Thank you for your comments, now I have sent V2 and added libdw support.
https://lore.kernel.org/loongarch/20230410111823.2538831-1-chenhuacai@xxxxxxxxxxx/T/#u

Huacai
>
>
> 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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