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From:   Jeff Xie <xiehuan09@gmail.com>
Date:   Mon, 10 Apr 2023 22:36:26 +0800
Message-ID: <CAEr6+ECGpiy-yWE=NyeuGT_ZSjsFPe1OLPNHn48NAOJ+fd8ZbQ@mail.gmail.com>
Subject: Re: [PATCH] tools/perf: Add basic support for LoongArch
To:     Huacai Chen <chenhuacai@kernel.org>
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 Huacai,

On Mon, Apr 10, 2023 at 7:33=E2=80=AFPM Huacai Chen <chenhuacai@kernel.org>=
 wrote:
>
> Hi, Jeff,
>
> On Fri, Mar 31, 2023 at 9:55=E2=80=AFPM Jeff Xie <xiehuan09@gmail.com> wr=
ote:
> >
> > 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@loo=
ngson.cn/T/#u

I greatly appreciate your acceptance of my suggestion and the support
for libdw in the LoongArch architecture ;-)


> Huacai
> >
> >
> > On Tue, Mar 7, 2023 at 10:21=E2=80=AFAM Huacai Chen <chenhuacai@loongso=
n.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/mksyscal=
ltbl
> > >  create mode 100644 tools/perf/arch/loongarch/include/dwarf-regs-tabl=
e.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/tool=
s/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/a=
rch/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/loonga=
rch/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/loo=
ngarch/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) $(sys=
def) > $@
> > > +
> > > +clean::
> > > +       $(call QUIET_CLEAN, loongarch) $(RM) $(header)
> > > +
> > > +archheaders: $(header)
> > > diff --git a/tools/perf/arch/loongarch/annotate/instructions.c b/tool=
s/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, cons=
t 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_=
unused)
> > > +{
> > > +       if (!arch->initialized) {
> > > +               arch->associate_instruction_ops =3D loongarch__associ=
ate_ins_ops;
> > > +               arch->initialized =3D true;
> > > +               arch->objdump.comment_char =3D '#';
> > > +       }
> > > +
> > > +       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@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 ${TMPDIR:-/tmp}/create-table-XXXXX=
X`
> > > +
> > > +       {
> > > +
> > > +       cat <<-_EoHEADER
> > > +               #include <stdio.h>
> > > +               #include "$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/t=
ools/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/pe=
rf/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 "$31";
> > > +       default:
> > > +               break;
> > > +       }
> > > +       return NULL;
> > > +}
> > > +
> > > +#endif /* ARCH_PERF_REGS_H */
> > > diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/l=
oongarch/util/Build
> > > new file mode 100644
> > > index 000000000000..fab48acf21c5
> > > --- /dev/null
> > > +++ b/tools/perf/arch/loongarch/util/Build
> > > @@ -0,0 +1,4 @@
> > > +perf-y +=3D perf_regs.o
> > > +
> > > +perf-$(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=
/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 regis=
ter 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/=
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[] =3D {
> > > +       SMPL_REG_END
> > > +};
> > > diff --git a/tools/perf/arch/loongarch/util/unwind-libunwind.c b/tool=
s/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* a=
rch, 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-reg=
s.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, unsign=
ed 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 =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/syscalltb=
l.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 syscallt=
bl_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


--=20
Thanks,
JeffXie