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References: <20230307021857.1217951-1-chenhuacai@loongson.cn> <CAEr6+EBid3A4ZLYrFuaO1b7UjXZHz2EBAY4+nMayZk0DTFEESg@mail.gmail.com>
In-Reply-To: <CAEr6+EBid3A4ZLYrFuaO1b7UjXZHz2EBAY4+nMayZk0DTFEESg@mail.gmail.com>
From:   Huacai Chen <chenhuacai@kernel.org>
Date:   Mon, 10 Apr 2023 19:33:10 +0800
Message-ID: <CAAhV-H4DRxYb8gCnGqLKYA8sNoMA6z2LFkyxM2OrupDGf8+M-Q@mail.gmail.com>
Subject: Re: [PATCH] tools/perf: Add basic support for LoongArch
To:     Jeff Xie <xiehuan09@gmail.com>
Cc:     Huacai Chen <chenhuacai@loongson.cn>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>, loongarch@lists.linux.dev,
        Xuefeng Li <lixuefeng@loongson.cn>,
        Tiezhu Yang <yangtiezhu@loongson.cn>,
        Xuerui Wang <kernel@xen0n.name>, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org,
        loongson-kernel@lists.loongnix.cn,
        Ming Wang <wangming01@loongson.cn>
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Hi, Jeff,

On Fri, Mar 31, 2023 at 9:55=E2=80=AFPM Jeff Xie <xiehuan09@gmail.com> wrot=
e:
>
> 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@loong=
son.cn/T/#u

Huacai
>
>
> On Tue, Mar 7, 2023 at 10:21=E2=80=AFAM Huacai Chen <chenhuacai@loongson.=
cn> wrote:
> >
> > Add basic support for LoongArch, which is very similar to the MIPS
> > version.
> >
> > Signed-off-by: Ming Wang <wangming01@loongson.cn>
> > Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
> > ---
> >  .../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/mksyscallt=
bl
> >  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 =3D PERF_REG_LOONGARCH_R31 + 1,
> > +};
> > +#endif /* _ASM_LOONGARCH_PERF_REGS_H */
> > diff --git a/tools/arch/loongarch/include/uapi/asm/unistd.h b/tools/arc=
h/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 ($(SRCARCH),arm64)
> >    LIBUNWIND_LIBS =3D -lunwind -lunwind-aarch64
> >  endif
> >
> > +ifeq ($(SRCARCH),loongarch)
> > +  NO_PERF_REGS :=3D 0
> > +  CFLAGS +=3D -I$(OUTPUT)arch/loongarch/include/generated
> > +  CFLAGS +=3D -I$(OUTPUT)../arch/loongarch/include/uapi
> > +  LIBUNWIND_LIBS =3D -lunwind -lunwind-loongarch
> > +endif
> > +
> >  ifeq ($(SRCARCH),riscv)
> >    NO_PERF_REGS :=3D 0
> >  endif
> > diff --git a/tools/perf/arch/loongarch/Build b/tools/perf/arch/loongarc=
h/Build
> > new file mode 100644
> > index 000000000000..e4e5f33c84d8
> > --- /dev/null
> > +++ b/tools/perf/arch/loongarch/Build
> > @@ -0,0 +1 @@
> > +perf-y +=3D util/
> > diff --git a/tools/perf/arch/loongarch/Makefile b/tools/perf/arch/loong=
arch/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 :=3D 1
> > +endif
> > +PERF_HAVE_JITDUMP :=3D 1
> > +
> > +#
> > +# Syscall table generation for perf
> > +#
> > +
> > +out    :=3D $(OUTPUT)arch/loongarch/include/generated/asm
> > +header :=3D $(out)/syscalls_64.c
> > +incpath :=3D $(srctree)/tools
> > +sysdef :=3D $(srctree)/tools/arch/loongarch/include/uapi/asm/unistd.h
> > +sysprf :=3D $(srctree)/tools/perf/arch/loongarch/entry/syscalls/
> > +systbl :=3D $(sysprf)/mksyscalltbl
> > +
> > +# Create output directory if not already present
> > +_dummy :=3D $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
> > +
> > +$(header): $(sysdef) $(systbl)
> > +       $(Q)$(SHELL) '$(systbl)' '$(CC)' '$(HOSTCC)' $(incpath) $(sysde=
f) > $@
> > +
> > +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 =3D 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 =3D &call_ops;
> > +       else if (!strncmp(name, "jirl", 4))
> > +               ops =3D &ret_ops;
> > +       else if (name[0] =3D=3D 'b')
> > +               ops =3D &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_un=
used)
> > +{
> > +       if (!arch->initialized) {
> > +               arch->associate_instruction_ops =3D loongarch__associat=
e_ins_ops;
> > +               arch->initialized =3D true;
> > +               arch->objdump.comment_char =3D '#';
> > +       }
> > +
> > +       return 0;
> > +}
> > diff --git a/tools/perf/arch/loongarch/entry/syscalls/mksyscalltbl b/to=
ols/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@loongson.cn>
> > +# Author(s):  Huacai Chen <chenhuacai@loongson.cn>
> > +# Copyright (C) 2020-2023 Loongson Technology Corporation Limited
> > +
> > +gcc=3D$1
> > +hostcc=3D$2
> > +incpath=3D$3
> > +input=3D$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=3D`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] =3D \\\"$sc\\\",\\n\",=
 $nr);"
> > +               last_sc=3D$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 $create_table_exe
> > +}
> > +
> > +create_table()
> > +{
> > +       echo "static const char *syscalltbl_loongarch[] =3D {"
> > +       create_table_from_c
> > +       echo "};"
> > +}
> > +
> > +$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/too=
ls/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[] =3D {
> > +       "$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 "$31";
> > +       default:
> > +               break;
> > +       }
> > +       return NULL;
> > +}
> > +
> > +#endif /* ARCH_PERF_REGS_H */
> > diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loo=
ngarch/util/Build
> > new file mode 100644
> > index 000000000000..fab48acf21c5
> > --- /dev/null
> > +++ b/tools/perf/arch/loongarch/util/Build
> > @@ -0,0 +1,4 @@
> > +perf-y +=3D perf_regs.o
> > +
> > +perf-$(CONFIG_DWARF)     +=3D dwarf-regs.o
> > +perf-$(CONFIG_LOCAL_LIBUNWIND) +=3D unwind-libunwind.o
> > diff --git a/tools/perf/arch/loongarch/util/dwarf-regs.c b/tools/perf/a=
rch/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 registe=
r 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] =3D {
> > +       "$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 %=3D 32;
> > +       return loongarch_gpr_names[n];
> > +}
> > diff --git a/tools/perf/arch/loongarch/util/perf_regs.c b/tools/perf/ar=
ch/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[] =3D {
> > +       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* arc=
h, 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[] =3D {
> >                         .comment_char =3D '#',
> >                 },
> >         },
> > +       {
> > +               .name =3D "loongarch",
> > +               .init =3D loongarch__annotate_init,
> > +               .objdump =3D {
> > +                       .comment_char =3D '#',
> > +               },
> > +       },
> >  };
> >
> >  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, vo=
id *debug, int nr_debug_ent
> >  #elif defined(__riscv) && __riscv_xlen =3D=3D 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 =3D syscalltbl=
_arm64;
> >  #include <asm/syscalls_n64.c>
> >  const int syscalltbl_native_max_id =3D SYSCALLTBL_MIPS_N64_MAX_ID;
> >  static const char **syscalltbl_native =3D syscalltbl_mips_n64;
> > +#elif defined(__loongarch__)
> > +#include <asm/syscalls.c>
> > +const int syscalltbl_native_max_id =3D SYSCALLTBL_LOONGARCH_MAX_ID;
> > +static const char **syscalltbl_native =3D syscalltbl_loongarch;
> >  #endif
> >
> >  struct syscall {
> > --
> > 2.39.1
> >
>
>
> --
> Thanks,
> JeffXie