diff mbox series

[20/20] target/loongarch: Add linux-user emulation support

Message ID 1624881885-31692-21-git-send-email-gaosong@loongson.cn (mailing list archive)
State New, archived
Headers show
Series Add LoongArch linux-user emulation support | expand

Commit Message

gaosong June 28, 2021, 12:04 p.m. UTC
Add files to linux-user/loongarch64
Add file to default-configs
Add loongarch to target/meson.build

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 MAINTAINERS                                        |   1 +
 default-configs/targets/loongarch64-linux-user.mak |   4 +
 include/elf.h                                      |   2 +
 linux-user/elfload.c                               |  58 ++++
 linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
 linux-user/loongarch64/signal.c                    | 193 +++++++++++++
 linux-user/loongarch64/sockbits.h                  |   1 +
 linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
 linux-user/loongarch64/target_cpu.h                |  36 +++
 linux-user/loongarch64/target_elf.h                |  14 +
 linux-user/loongarch64/target_fcntl.h              |  12 +
 linux-user/loongarch64/target_signal.h             |  28 ++
 linux-user/loongarch64/target_structs.h            |  49 ++++
 linux-user/loongarch64/target_syscall.h            |  46 +++
 linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
 linux-user/syscall_defs.h                          |   8 +-
 meson.build                                        |   2 +-
 qapi/machine-target.json                           |   4 +-
 target/loongarch/meson.build                       |  19 ++
 target/meson.build                                 |   1 +
 20 files changed, 1185 insertions(+), 6 deletions(-)
 create mode 100644 default-configs/targets/loongarch64-linux-user.mak
 create mode 100644 linux-user/loongarch64/cpu_loop.c
 create mode 100644 linux-user/loongarch64/signal.c
 create mode 100644 linux-user/loongarch64/sockbits.h
 create mode 100644 linux-user/loongarch64/syscall_nr.h
 create mode 100644 linux-user/loongarch64/target_cpu.h
 create mode 100644 linux-user/loongarch64/target_elf.h
 create mode 100644 linux-user/loongarch64/target_fcntl.h
 create mode 100644 linux-user/loongarch64/target_signal.h
 create mode 100644 linux-user/loongarch64/target_structs.h
 create mode 100644 linux-user/loongarch64/target_syscall.h
 create mode 100644 linux-user/loongarch64/termbits.h
 create mode 100644 target/loongarch/meson.build

Comments

Peter Maydell June 29, 2021, 1:42 p.m. UTC | #1
On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>
> Add files to linux-user/loongarch64
> Add file to default-configs
> Add loongarch to target/meson.build
>
> Signed-off-by: Song Gao <gaosong@loongson.cn>
> ---
>  MAINTAINERS                                        |   1 +
>  default-configs/targets/loongarch64-linux-user.mak |   4 +
>  include/elf.h                                      |   2 +
>  linux-user/elfload.c                               |  58 ++++
>  linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>  linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>  linux-user/loongarch64/sockbits.h                  |   1 +
>  linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>  linux-user/loongarch64/target_cpu.h                |  36 +++
>  linux-user/loongarch64/target_elf.h                |  14 +
>  linux-user/loongarch64/target_fcntl.h              |  12 +
>  linux-user/loongarch64/target_signal.h             |  28 ++
>  linux-user/loongarch64/target_structs.h            |  49 ++++
>  linux-user/loongarch64/target_syscall.h            |  46 +++
>  linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>  linux-user/syscall_defs.h                          |   8 +-
>  meson.build                                        |   2 +-
>  qapi/machine-target.json                           |   4 +-
>  target/loongarch/meson.build                       |  19 ++
>  target/meson.build                                 |   1 +
>  20 files changed, 1185 insertions(+), 6 deletions(-)

This is a massive patch that would benefit from being split up
into multiple smaller patches.

I'm told by a kernel developer that loongarch hasn't yet been
accepted into the Linux kernel mainline. Until it has been, the
syscall ABI for it is not yet stable, so we won't be able to take
the linux-user patches for it yet. (We have been burned in the
past by taking linux-user architecture support patches without
realizing they weren't for a stable ABI, and then being out of
sync with the eventual upstream kernel ABI that was accepted.)

We can certainly do code review in the meantime, though.

thanks
-- PMM
maobibo June 30, 2021, 1:41 a.m. UTC | #2
在 2021年06月29日 21:42, Peter Maydell 写道:
> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>
>> Add files to linux-user/loongarch64
>> Add file to default-configs
>> Add loongarch to target/meson.build
>>
>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>> ---
>>  MAINTAINERS                                        |   1 +
>>  default-configs/targets/loongarch64-linux-user.mak |   4 +
>>  include/elf.h                                      |   2 +
>>  linux-user/elfload.c                               |  58 ++++
>>  linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>  linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>  linux-user/loongarch64/sockbits.h                  |   1 +
>>  linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>  linux-user/loongarch64/target_cpu.h                |  36 +++
>>  linux-user/loongarch64/target_elf.h                |  14 +
>>  linux-user/loongarch64/target_fcntl.h              |  12 +
>>  linux-user/loongarch64/target_signal.h             |  28 ++
>>  linux-user/loongarch64/target_structs.h            |  49 ++++
>>  linux-user/loongarch64/target_syscall.h            |  46 +++
>>  linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>  linux-user/syscall_defs.h                          |   8 +-
>>  meson.build                                        |   2 +-
>>  qapi/machine-target.json                           |   4 +-
>>  target/loongarch/meson.build                       |  19 ++
>>  target/meson.build                                 |   1 +
>>  20 files changed, 1185 insertions(+), 6 deletions(-)
> 
> This is a massive patch that would benefit from being split up
> into multiple smaller patches.
> 
> I'm told by a kernel developer that loongarch hasn't yet been
> accepted into the Linux kernel mainline. Until it has been, the
> syscall ABI for it is not yet stable, so we won't be able to take
> the linux-user patches for it yet. (We have been burned in the
> past by taking linux-user architecture support patches without
> realizing they weren't for a stable ABI, and then being out of
> sync with the eventual upstream kernel ABI that was accepted.)
> 
> We can certainly do code review in the meantime, though.
Thanks for reviewing the big series patches. It is understandable that
there should be linux kernel merged for one new architecture support
firstly, and then there will be linux-user simulator later.

We are planning to submit patch to linux kernel for LoongArch support,
there is the link:
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next

And we will continueto  submit softmmu support for LoongArch. And is there
any extra requirements for softmmu simulation for new architecture,
such as gcc/binutils/bios?

regards
bibo, mao


> 
> thanks
> -- PMM
>
gaosong June 30, 2021, 1:59 a.m. UTC | #3
Hi, Peter,

On 06/29/2021 09:42 PM, Peter Maydell wrote:
> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>
>> Add files to linux-user/loongarch64
>> Add file to default-configs
>> Add loongarch to target/meson.build
>>
>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>> ---
>>  MAINTAINERS                                        |   1 +
>>  default-configs/targets/loongarch64-linux-user.mak |   4 +
>>  include/elf.h                                      |   2 +
>>  linux-user/elfload.c                               |  58 ++++
>>  linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>  linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>  linux-user/loongarch64/sockbits.h                  |   1 +
>>  linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>  linux-user/loongarch64/target_cpu.h                |  36 +++
>>  linux-user/loongarch64/target_elf.h                |  14 +
>>  linux-user/loongarch64/target_fcntl.h              |  12 +
>>  linux-user/loongarch64/target_signal.h             |  28 ++
>>  linux-user/loongarch64/target_structs.h            |  49 ++++
>>  linux-user/loongarch64/target_syscall.h            |  46 +++
>>  linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>  linux-user/syscall_defs.h                          |   8 +-
>>  meson.build                                        |   2 +-
>>  qapi/machine-target.json                           |   4 +-
>>  target/loongarch/meson.build                       |  19 ++
>>  target/meson.build                                 |   1 +
>>  20 files changed, 1185 insertions(+), 6 deletions(-)
> 
> This is a massive patch that would benefit from being split up
> into multiple smaller patches.
> 
> I'm told by a kernel developer that loongarch hasn't yet been
> accepted into the Linux kernel mainline. Until it has been, the
> syscall ABI for it is not yet stable, so we won't be able to take
> the linux-user patches for it yet. (We have been burned in the
> past by taking linux-user architecture support patches without
> realizing they weren't for a stable ABI, and then being out of
> sync with the eventual upstream kernel ABI that was accepted.)
> 
> We can certainly do code review in the meantime, though.
> 
> thanks
> -- PMM
> 
Accept, I can divide this patch into 2 or 3 smaller patches.

thanks
Alex Bennée June 30, 2021, 9:36 a.m. UTC | #4
maobibo <maobibo@loongson.cn> writes:

> 在 2021年06月29日 21:42, Peter Maydell 写道:
>> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>>
>>> Add files to linux-user/loongarch64
>>> Add file to default-configs
>>> Add loongarch to target/meson.build
>>>
>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>> ---
>>>  MAINTAINERS                                        |   1 +
>>>  default-configs/targets/loongarch64-linux-user.mak |   4 +
>>>  include/elf.h                                      |   2 +
>>>  linux-user/elfload.c                               |  58 ++++
>>>  linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>>  linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>>  linux-user/loongarch64/sockbits.h                  |   1 +
>>>  linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>>  linux-user/loongarch64/target_cpu.h                |  36 +++
>>>  linux-user/loongarch64/target_elf.h                |  14 +
>>>  linux-user/loongarch64/target_fcntl.h              |  12 +
>>>  linux-user/loongarch64/target_signal.h             |  28 ++
>>>  linux-user/loongarch64/target_structs.h            |  49 ++++
>>>  linux-user/loongarch64/target_syscall.h            |  46 +++
>>>  linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>>  linux-user/syscall_defs.h                          |   8 +-
>>>  meson.build                                        |   2 +-
>>>  qapi/machine-target.json                           |   4 +-
>>>  target/loongarch/meson.build                       |  19 ++
>>>  target/meson.build                                 |   1 +
>>>  20 files changed, 1185 insertions(+), 6 deletions(-)
>> 
>> This is a massive patch that would benefit from being split up
>> into multiple smaller patches.
>> 
>> I'm told by a kernel developer that loongarch hasn't yet been
>> accepted into the Linux kernel mainline. Until it has been, the
>> syscall ABI for it is not yet stable, so we won't be able to take
>> the linux-user patches for it yet. (We have been burned in the
>> past by taking linux-user architecture support patches without
>> realizing they weren't for a stable ABI, and then being out of
>> sync with the eventual upstream kernel ABI that was accepted.)
>> 
>> We can certainly do code review in the meantime, though.
> Thanks for reviewing the big series patches. It is understandable that
> there should be linux kernel merged for one new architecture support
> firstly, and then there will be linux-user simulator later.
>
> We are planning to submit patch to linux kernel for LoongArch support,
> there is the link:
> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
>
> And we will continueto  submit softmmu support for LoongArch. And is there
> any extra requirements for softmmu simulation for new architecture,
> such as gcc/binutils/bios?

Ideally if there are some pre-built toolchains either as part of a
distro (we've used Debian Sid before for some) or easily to install in a
docker container as binary tarballs (like we do for tricore) then we can
enable basic check-tcg functionality.

Going forward having stable URLs for test images of distros means we can
also enable check-acceptance tests.

>
> regards
> bibo, mao
>
>
>> 
>> thanks
>> -- PMM
>>
maobibo July 1, 2021, 1:07 a.m. UTC | #5
在 2021年06月30日 17:36, Alex Bennée 写道:
> 
> maobibo <maobibo@loongson.cn> writes:
> 
>> 在 2021年06月29日 21:42, Peter Maydell 写道:
>>> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>>>
>>>> Add files to linux-user/loongarch64
>>>> Add file to default-configs
>>>> Add loongarch to target/meson.build
>>>>
>>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>>> ---
>>>>  MAINTAINERS                                        |   1 +
>>>>  default-configs/targets/loongarch64-linux-user.mak |   4 +
>>>>  include/elf.h                                      |   2 +
>>>>  linux-user/elfload.c                               |  58 ++++
>>>>  linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>>>  linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>>>  linux-user/loongarch64/sockbits.h                  |   1 +
>>>>  linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>>>  linux-user/loongarch64/target_cpu.h                |  36 +++
>>>>  linux-user/loongarch64/target_elf.h                |  14 +
>>>>  linux-user/loongarch64/target_fcntl.h              |  12 +
>>>>  linux-user/loongarch64/target_signal.h             |  28 ++
>>>>  linux-user/loongarch64/target_structs.h            |  49 ++++
>>>>  linux-user/loongarch64/target_syscall.h            |  46 +++
>>>>  linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>>>  linux-user/syscall_defs.h                          |   8 +-
>>>>  meson.build                                        |   2 +-
>>>>  qapi/machine-target.json                           |   4 +-
>>>>  target/loongarch/meson.build                       |  19 ++
>>>>  target/meson.build                                 |   1 +
>>>>  20 files changed, 1185 insertions(+), 6 deletions(-)
>>>
>>> This is a massive patch that would benefit from being split up
>>> into multiple smaller patches.
>>>
>>> I'm told by a kernel developer that loongarch hasn't yet been
>>> accepted into the Linux kernel mainline. Until it has been, the
>>> syscall ABI for it is not yet stable, so we won't be able to take
>>> the linux-user patches for it yet. (We have been burned in the
>>> past by taking linux-user architecture support patches without
>>> realizing they weren't for a stable ABI, and then being out of
>>> sync with the eventual upstream kernel ABI that was accepted.)
>>>
>>> We can certainly do code review in the meantime, though.
>> Thanks for reviewing the big series patches. It is understandable that
>> there should be linux kernel merged for one new architecture support
>> firstly, and then there will be linux-user simulator later.
>>
>> We are planning to submit patch to linux kernel for LoongArch support,
>> there is the link:
>> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
>>
>> And we will continueto  submit softmmu support for LoongArch. And is there
>> any extra requirements for softmmu simulation for new architecture,
>> such as gcc/binutils/bios?
> 
> Ideally if there are some pre-built toolchains either as part of a
> distro (we've used Debian Sid before for some) or easily to install in a
> docker container as binary tarballs (like we do for tricore) then we can
> enable basic check-tcg functionality.
> 
> Going forward having stable URLs for test images of distros means we can
> also enable check-acceptance tests.
Thanks for guidance, it requires that linux kernel/gcc/glibc are submitted
already. My meaning is that linux-user emulation depends on kernel 
syscall ABI, softmmu emulation does not have such dependency, on the contrast
system emulation can be used to verify linux kernel. Is there any requirement
for system emulation of new architecture?

bibo,mao

> 
>>
>> regards
>> bibo, mao
>>
>>
>>>
>>> thanks
>>> -- PMM
>>>
> 
>
Thomas Huth July 1, 2021, 6:47 a.m. UTC | #6
On 01/07/2021 03.07, maobibo wrote:
> 
> 
> 在 2021年06月30日 17:36, Alex Bennée 写道:
>>
>> maobibo <maobibo@loongson.cn> writes:
>>
>>> 在 2021年06月29日 21:42, Peter Maydell 写道:
>>>> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>>>>
>>>>> Add files to linux-user/loongarch64
>>>>> Add file to default-configs
>>>>> Add loongarch to target/meson.build
>>>>>
>>>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>>>> ---
>>>>>   MAINTAINERS                                        |   1 +
>>>>>   default-configs/targets/loongarch64-linux-user.mak |   4 +
>>>>>   include/elf.h                                      |   2 +
>>>>>   linux-user/elfload.c                               |  58 ++++
>>>>>   linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>>>>   linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>>>>   linux-user/loongarch64/sockbits.h                  |   1 +
>>>>>   linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>>>>   linux-user/loongarch64/target_cpu.h                |  36 +++
>>>>>   linux-user/loongarch64/target_elf.h                |  14 +
>>>>>   linux-user/loongarch64/target_fcntl.h              |  12 +
>>>>>   linux-user/loongarch64/target_signal.h             |  28 ++
>>>>>   linux-user/loongarch64/target_structs.h            |  49 ++++
>>>>>   linux-user/loongarch64/target_syscall.h            |  46 +++
>>>>>   linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>>>>   linux-user/syscall_defs.h                          |   8 +-
>>>>>   meson.build                                        |   2 +-
>>>>>   qapi/machine-target.json                           |   4 +-
>>>>>   target/loongarch/meson.build                       |  19 ++
>>>>>   target/meson.build                                 |   1 +
>>>>>   20 files changed, 1185 insertions(+), 6 deletions(-)
>>>>
>>>> This is a massive patch that would benefit from being split up
>>>> into multiple smaller patches.
>>>>
>>>> I'm told by a kernel developer that loongarch hasn't yet been
>>>> accepted into the Linux kernel mainline. Until it has been, the
>>>> syscall ABI for it is not yet stable, so we won't be able to take
>>>> the linux-user patches for it yet. (We have been burned in the
>>>> past by taking linux-user architecture support patches without
>>>> realizing they weren't for a stable ABI, and then being out of
>>>> sync with the eventual upstream kernel ABI that was accepted.)
>>>>
>>>> We can certainly do code review in the meantime, though.
>>> Thanks for reviewing the big series patches. It is understandable that
>>> there should be linux kernel merged for one new architecture support
>>> firstly, and then there will be linux-user simulator later.
>>>
>>> We are planning to submit patch to linux kernel for LoongArch support,
>>> there is the link:
>>> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
>>>
>>> And we will continueto  submit softmmu support for LoongArch. And is there
>>> any extra requirements for softmmu simulation for new architecture,
>>> such as gcc/binutils/bios?
>>
>> Ideally if there are some pre-built toolchains either as part of a
>> distro (we've used Debian Sid before for some) or easily to install in a
>> docker container as binary tarballs (like we do for tricore) then we can
>> enable basic check-tcg functionality.
>>
>> Going forward having stable URLs for test images of distros means we can
>> also enable check-acceptance tests.
> Thanks for guidance, it requires that linux kernel/gcc/glibc are submitted
> already. My meaning is that linux-user emulation depends on kernel
> syscall ABI, softmmu emulation does not have such dependency, on the contrast
> system emulation can be used to verify linux kernel. Is there any requirement
> for system emulation of new architecture?

I think we'd need some way of automatic regression testing for new targets. 
If your board has a serial UART that is easy to use, then please add a test 
in tests/qtest/boot-serial-test.c. And if there are any public Linux kernel 
binaries for (reliable) download anywhere, please add a test in 
tests/acceptance/, see for example the various machine_*.py files or 
boot_linux_console.py there.

  HTH,
   Thomas
maobibo July 1, 2021, 7:08 a.m. UTC | #7
在 2021年07月01日 14:47, Thomas Huth 写道:
> On 01/07/2021 03.07, maobibo wrote:
>>
>>
>> 在 2021年06月30日 17:36, Alex Bennée 写道:
>>>
>>> maobibo <maobibo@loongson.cn> writes:
>>>
>>>> 在 2021年06月29日 21:42, Peter Maydell 写道:
>>>>> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>>>>>
>>>>>> Add files to linux-user/loongarch64
>>>>>> Add file to default-configs
>>>>>> Add loongarch to target/meson.build
>>>>>>
>>>>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>>>>> ---
>>>>>>   MAINTAINERS                                        |   1 +
>>>>>>   default-configs/targets/loongarch64-linux-user.mak |   4 +
>>>>>>   include/elf.h                                      |   2 +
>>>>>>   linux-user/elfload.c                               |  58 ++++
>>>>>>   linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>>>>>   linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>>>>>   linux-user/loongarch64/sockbits.h                  |   1 +
>>>>>>   linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>>>>>   linux-user/loongarch64/target_cpu.h                |  36 +++
>>>>>>   linux-user/loongarch64/target_elf.h                |  14 +
>>>>>>   linux-user/loongarch64/target_fcntl.h              |  12 +
>>>>>>   linux-user/loongarch64/target_signal.h             |  28 ++
>>>>>>   linux-user/loongarch64/target_structs.h            |  49 ++++
>>>>>>   linux-user/loongarch64/target_syscall.h            |  46 +++
>>>>>>   linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>>>>>   linux-user/syscall_defs.h                          |   8 +-
>>>>>>   meson.build                                        |   2 +-
>>>>>>   qapi/machine-target.json                           |   4 +-
>>>>>>   target/loongarch/meson.build                       |  19 ++
>>>>>>   target/meson.build                                 |   1 +
>>>>>>   20 files changed, 1185 insertions(+), 6 deletions(-)
>>>>>
>>>>> This is a massive patch that would benefit from being split up
>>>>> into multiple smaller patches.
>>>>>
>>>>> I'm told by a kernel developer that loongarch hasn't yet been
>>>>> accepted into the Linux kernel mainline. Until it has been, the
>>>>> syscall ABI for it is not yet stable, so we won't be able to take
>>>>> the linux-user patches for it yet. (We have been burned in the
>>>>> past by taking linux-user architecture support patches without
>>>>> realizing they weren't for a stable ABI, and then being out of
>>>>> sync with the eventual upstream kernel ABI that was accepted.)
>>>>>
>>>>> We can certainly do code review in the meantime, though.
>>>> Thanks for reviewing the big series patches. It is understandable that
>>>> there should be linux kernel merged for one new architecture support
>>>> firstly, and then there will be linux-user simulator later.
>>>>
>>>> We are planning to submit patch to linux kernel for LoongArch support,
>>>> there is the link:
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
>>>>
>>>> And we will continueto  submit softmmu support for LoongArch. And is there
>>>> any extra requirements for softmmu simulation for new architecture,
>>>> such as gcc/binutils/bios?
>>>
>>> Ideally if there are some pre-built toolchains either as part of a
>>> distro (we've used Debian Sid before for some) or easily to install in a
>>> docker container as binary tarballs (like we do for tricore) then we can
>>> enable basic check-tcg functionality.
>>>
>>> Going forward having stable URLs for test images of distros means we can
>>> also enable check-acceptance tests.
>> Thanks for guidance, it requires that linux kernel/gcc/glibc are submitted
>> already. My meaning is that linux-user emulation depends on kernel
>> syscall ABI, softmmu emulation does not have such dependency, on the contrast
>> system emulation can be used to verify linux kernel. Is there any requirement
>> for system emulation of new architecture?
> 
> I think we'd need some way of automatic regression testing for new targets. If your board has a serial UART that is easy to use, then please add a test in tests/qtest/boot-serial-test.c. And if there are any public Linux kernel binaries for (reliable) download anywhere, please add a test in tests/acceptance/, see for example the various machine_*.py files or boot_linux_console.py there.
> 
Got it, thanks for kindly help.

Regards
bibo, mao

>  HTH,
>   Thomas
Alex Bennée July 1, 2021, 10:35 a.m. UTC | #8
Thomas Huth <thuth@redhat.com> writes:

> On 01/07/2021 03.07, maobibo wrote:
>> 在 2021年06月30日 17:36, Alex Bennée 写道:
>>>
>>> maobibo <maobibo@loongson.cn> writes:
>>>
>>>> 在 2021年06月29日 21:42, Peter Maydell 写道:
>>>>> On Mon, 28 Jun 2021 at 13:05, Song Gao <gaosong@loongson.cn> wrote:
>>>>>>
>>>>>> Add files to linux-user/loongarch64
>>>>>> Add file to default-configs
>>>>>> Add loongarch to target/meson.build
>>>>>>
>>>>>> Signed-off-by: Song Gao <gaosong@loongson.cn>
>>>>>> ---
>>>>>>   MAINTAINERS                                        |   1 +
>>>>>>   default-configs/targets/loongarch64-linux-user.mak |   4 +
>>>>>>   include/elf.h                                      |   2 +
>>>>>>   linux-user/elfload.c                               |  58 ++++
>>>>>>   linux-user/loongarch64/cpu_loop.c                  | 177 ++++++++++++
>>>>>>   linux-user/loongarch64/signal.c                    | 193 +++++++++++++
>>>>>>   linux-user/loongarch64/sockbits.h                  |   1 +
>>>>>>   linux-user/loongarch64/syscall_nr.h                | 307 +++++++++++++++++++++
>>>>>>   linux-user/loongarch64/target_cpu.h                |  36 +++
>>>>>>   linux-user/loongarch64/target_elf.h                |  14 +
>>>>>>   linux-user/loongarch64/target_fcntl.h              |  12 +
>>>>>>   linux-user/loongarch64/target_signal.h             |  28 ++
>>>>>>   linux-user/loongarch64/target_structs.h            |  49 ++++
>>>>>>   linux-user/loongarch64/target_syscall.h            |  46 +++
>>>>>>   linux-user/loongarch64/termbits.h                  | 229 +++++++++++++++
>>>>>>   linux-user/syscall_defs.h                          |   8 +-
>>>>>>   meson.build                                        |   2 +-
>>>>>>   qapi/machine-target.json                           |   4 +-
>>>>>>   target/loongarch/meson.build                       |  19 ++
>>>>>>   target/meson.build                                 |   1 +
>>>>>>   20 files changed, 1185 insertions(+), 6 deletions(-)
>>>>>
>>>>> This is a massive patch that would benefit from being split up
>>>>> into multiple smaller patches.
>>>>>
>>>>> I'm told by a kernel developer that loongarch hasn't yet been
>>>>> accepted into the Linux kernel mainline. Until it has been, the
>>>>> syscall ABI for it is not yet stable, so we won't be able to take
>>>>> the linux-user patches for it yet. (We have been burned in the
>>>>> past by taking linux-user architecture support patches without
>>>>> realizing they weren't for a stable ABI, and then being out of
>>>>> sync with the eventual upstream kernel ABI that was accepted.)
>>>>>
>>>>> We can certainly do code review in the meantime, though.
>>>> Thanks for reviewing the big series patches. It is understandable that
>>>> there should be linux kernel merged for one new architecture support
>>>> firstly, and then there will be linux-user simulator later.
>>>>
>>>> We are planning to submit patch to linux kernel for LoongArch support,
>>>> there is the link:
>>>> https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson.git/log/?h=loongarch-next
>>>>
>>>> And we will continueto  submit softmmu support for LoongArch. And is there
>>>> any extra requirements for softmmu simulation for new architecture,
>>>> such as gcc/binutils/bios?
>>>
>>> Ideally if there are some pre-built toolchains either as part of a
>>> distro (we've used Debian Sid before for some) or easily to install in a
>>> docker container as binary tarballs (like we do for tricore) then we can
>>> enable basic check-tcg functionality.
>>>
>>> Going forward having stable URLs for test images of distros means we can
>>> also enable check-acceptance tests.
>> Thanks for guidance, it requires that linux kernel/gcc/glibc are submitted
>> already. My meaning is that linux-user emulation depends on kernel
>> syscall ABI, softmmu emulation does not have such dependency, on the contrast
>> system emulation can be used to verify linux kernel. Is there any requirement
>> for system emulation of new architecture?
>
> I think we'd need some way of automatic regression testing for new
> targets. If your board has a serial UART that is easy to use, then
> please add a test in tests/qtest/boot-serial-test.c.

You can also write a very minimal softmmu harness with either
semihosting or a debug port - currently we can run the tests for
x86/arm/alpha. See tests/tcg/multiarch/system and the various
boot.S/kernel.ld in tests/tcg/FOO/system and the Makefile.softmmu-target
in the relevant directories.

Basically you need enough initialisation to get to a non-stdlib main and
a __sys_outc and __exit implementation. This allows for simple smoke
tests that don't need a full Linux/kernel to run.

> And if there are
> any public Linux kernel binaries for (reliable) download anywhere,
> please add a test in tests/acceptance/, see for example the various
> machine_*.py files or boot_linux_console.py there.
>
>  HTH,
>   Thomas
Peter Maydell July 1, 2021, 10:53 a.m. UTC | #9
On Thu, 1 Jul 2021 at 11:40, Alex Bennée <alex.bennee@linaro.org> wrote:
> Thomas Huth <thuth@redhat.com> writes:
> > I think we'd need some way of automatic regression testing for new
> > targets. If your board has a serial UART that is easy to use, then
> > please add a test in tests/qtest/boot-serial-test.c.
>
> You can also write a very minimal softmmu harness with either
> semihosting or a debug port - currently we can run the tests for
> x86/arm/alpha. See tests/tcg/multiarch/system and the various
> boot.S/kernel.ld in tests/tcg/FOO/system and the Makefile.softmmu-target
> in the relevant directories.

You can only use semihosting if your architecture has actually defined
(ie written down in a spec document that you intend to adhere to)
an ABI for it, though...

-- PMM
maobibo July 1, 2021, 12:05 p.m. UTC | #10
在 2021年07月01日 18:53, Peter Maydell 写道:
> On Thu, 1 Jul 2021 at 11:40, Alex Bennée <alex.bennee@linaro.org> wrote:
>> Thomas Huth <thuth@redhat.com> writes:
>>> I think we'd need some way of automatic regression testing for new
>>> targets. If your board has a serial UART that is easy to use, then
>>> please add a test in tests/qtest/boot-serial-test.c.
>>
>> You can also write a very minimal softmmu harness with either
>> semihosting or a debug port - currently we can run the tests for
>> x86/arm/alpha. See tests/tcg/multiarch/system and the various
>> boot.S/kernel.ld in tests/tcg/FOO/system and the Makefile.softmmu-target
>> in the relevant directories.
> 
> You can only use semihosting if your architecture has actually defined
> (ie written down in a spec document that you intend to adhere to)
> an ABI for it, though...
yes, the architecture is actually defined and real hw box is used already,
only that software does not go into upstream. We will wait for gcc compiler
merged into upstream and send a minimal softmmu version, and add bare-metal
test cases in tests/tcg/FOO/system directory.

However thanks for your guidance anyway.

regards
bibo, mao
> 
> -- PMM
>
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index f987e2b..36dacf5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -214,6 +214,7 @@  M: Song Gao <gaosong@loongson.cn>
 S: Maintained
 F: target/loongarch/
 F: disas/loongarch.c
+F: linux-user/loongarch64/
 
 M68K TCG CPUs
 M: Laurent Vivier <laurent@vivier.eu>
diff --git a/default-configs/targets/loongarch64-linux-user.mak b/default-configs/targets/loongarch64-linux-user.mak
new file mode 100644
index 0000000..5af380a
--- /dev/null
+++ b/default-configs/targets/loongarch64-linux-user.mak
@@ -0,0 +1,4 @@ 
+# Default configuration for loongson64-linux-user
+TARGET_LOONGARCH64=y
+TARGET_ARCH=loongarch64
+TARGET_BASE_ARCH=loongarch
diff --git a/include/elf.h b/include/elf.h
index 811bf4a..3a4bcb6 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -182,6 +182,8 @@  typedef struct mips_elf_abiflags_v0 {
 
 #define EM_NANOMIPS     249     /* Wave Computing nanoMIPS */
 
+#define EM_LOONGARCH    258     /* LoongArch */
+
 /*
  * This is an interim value that we will use until the committee comes
  * up with a final number.
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 598ab8a..08bc9dc 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -909,6 +909,64 @@  static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUPPCState *en
 
 #endif
 
+#ifdef TARGET_LOONGARCH64
+
+#define ELF_START_MMAP 0x80000000
+
+#define ELF_CLASS   ELFCLASS64
+#define ELF_ARCH    EM_LOONGARCH
+
+#define elf_check_arch(x) ((x) == EM_LOONGARCH)
+static inline void init_thread(struct target_pt_regs *regs,
+                               struct image_info *infop)
+{
+    regs->csr_crmd = 2 << 3;
+    regs->csr_era = infop->entry;
+    regs->regs[3] = infop->start_stack;
+}
+
+/* See linux kernel: arch/loongarch/include/asm/elf.h.  */
+#define ELF_NREG 45
+typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
+
+/* See linux kernel: arch/loongarch/include/asm/reg.h.  */
+enum {
+    TARGET_EF_R0 = 0,
+    TARGET_EF_CSR_ERA = TARGET_EF_R0 + 32,
+    TARGET_EF_CSR_BADVADDR = TARGET_EF_R0 + 33,
+};
+
+/* See linux kernel: arch/loongarch/kernel/process.c:loongarch_dump_regs64. */
+static void elf_core_copy_regs(target_elf_gregset_t *regs,
+                               const CPULoongArchState *env)
+{
+    int i;
+
+    for (i = 0; i < TARGET_EF_R0; i++) {
+        (*regs)[i] = 0;
+    }
+    (*regs)[TARGET_EF_R0] = 0;
+
+    for (i = 1; i < ARRAY_SIZE(env->active_tc.gpr); i++) {
+        (*regs)[TARGET_EF_R0 + i] = tswapreg(env->active_tc.gpr[i]);
+    }
+
+    (*regs)[TARGET_EF_CSR_ERA] = tswapreg(env->active_tc.PC);
+    (*regs)[TARGET_EF_CSR_BADVADDR] = tswapreg(env->CSR_BADV);
+}
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE        4096
+
+#define ELF_HWCAP get_elf_hwcap()
+
+static uint32_t get_elf_hwcap(void)
+{
+    return 0;
+}
+
+#endif /* TARGET_LOONGARCH64 */
+
 #ifdef TARGET_MIPS
 
 #define ELF_START_MMAP 0x80000000
diff --git a/linux-user/loongarch64/cpu_loop.c b/linux-user/loongarch64/cpu_loop.c
new file mode 100644
index 0000000..91f35bc
--- /dev/null
+++ b/linux-user/loongarch64/cpu_loop.c
@@ -0,0 +1,177 @@ 
+/*
+ * QEMU LoongArch user cpu loop.
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#include "qemu/osdep.h"
+#include "qemu.h"
+#include "qemu-common.h"
+#include "cpu_loop-common.h"
+#include "elf.h"
+
+/* Break codes */
+enum {
+    BRK_OVERFLOW = 6,
+    BRK_DIVZERO = 7
+};
+
+static int do_break(CPULoongArchState *env, target_siginfo_t *info,
+                    unsigned int code)
+{
+    int ret = -1;
+
+    switch (code) {
+    case BRK_OVERFLOW:
+    case BRK_DIVZERO:
+        info->si_signo = TARGET_SIGFPE;
+        info->si_errno = 0;
+        info->si_code = (code == BRK_OVERFLOW) ? FPE_INTOVF : FPE_INTDIV;
+        queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
+        ret = 0;
+        break;
+    default:
+        info->si_signo = TARGET_SIGTRAP;
+        info->si_errno = 0;
+        queue_signal(env, info->si_signo, QEMU_SI_FAULT, &*info);
+        ret = 0;
+        break;
+    }
+
+    return ret;
+}
+
+void cpu_loop(CPULoongArchState *env)
+{
+    CPUState *cs = CPU(loongarch_env_get_cpu(env));
+    target_siginfo_t info;
+    int trapnr;
+    abi_long ret;
+
+    for (;;) {
+        cpu_exec_start(cs);
+        trapnr = cpu_exec(cs);
+        cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
+        switch (trapnr) {
+        case EXCP_SYSCALL:
+            env->active_tc.PC += 4;
+            ret = do_syscall(env, env->active_tc.gpr[11],
+                             env->active_tc.gpr[4], env->active_tc.gpr[5],
+                             env->active_tc.gpr[6], env->active_tc.gpr[7],
+                             env->active_tc.gpr[8], env->active_tc.gpr[9],
+                             -1, -1);
+            if (ret == -TARGET_ERESTARTSYS) {
+                env->active_tc.PC -= 4;
+                break;
+            }
+            if (ret == -TARGET_QEMU_ESIGRETURN) {
+                /*
+                 * Returning from a successful sigreturn syscall.
+                 * Avoid clobbering register state.
+                 */
+                break;
+            }
+            env->active_tc.gpr[4] = ret;
+            break;
+        case EXCP_TLBL:
+        case EXCP_TLBS:
+        case EXCP_ADE:
+            info.si_signo = TARGET_SIGSEGV;
+            info.si_errno = 0;
+            info.si_code = TARGET_SEGV_MAPERR;
+            info._sifields._sigfault._addr = env->CSR_BADV;
+            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
+            break;
+        case EXCP_FPDIS:
+        case EXCP_INE:
+            info.si_signo = TARGET_SIGILL;
+            info.si_errno = 0;
+            info.si_code = 0;
+            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
+            break;
+        case EXCP_FPE:
+            info.si_signo = TARGET_SIGFPE;
+            info.si_errno = 0;
+            info.si_code = TARGET_FPE_FLTUNK;
+            if (GET_FP_CAUSE(env->active_fpu.fcsr0) & FP_INVALID) {
+                info.si_code = TARGET_FPE_FLTINV;
+            } else if (GET_FP_CAUSE(env->active_fpu.fcsr0) & FP_DIV0) {
+                info.si_code = TARGET_FPE_FLTDIV;
+            } else if (GET_FP_CAUSE(env->active_fpu.fcsr0) & FP_OVERFLOW) {
+                info.si_code = TARGET_FPE_FLTOVF;
+            } else if (GET_FP_CAUSE(env->active_fpu.fcsr0) & FP_UNDERFLOW) {
+                info.si_code = TARGET_FPE_FLTUND;
+            } else if (GET_FP_CAUSE(env->active_fpu.fcsr0) & FP_INEXACT) {
+                info.si_code = TARGET_FPE_FLTRES;
+            }
+            queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info);
+            break;
+        case EXCP_BREAK:
+            {
+                abi_ulong trap_instr;
+                unsigned int code;
+
+                ret = get_user_u32(trap_instr, env->active_tc.PC);
+                if (ret != 0) {
+                    abort();
+                    goto error;
+                }
+
+                code = trap_instr & 0x7fff;
+
+                if (do_break(env, &info, code) != 0) {
+                    abort();
+                    goto error;
+                }
+            }
+            break;
+        case EXCP_TRAP:
+            {
+                abi_ulong trap_instr;
+                unsigned int code = 0;
+
+                ret = get_user_u32(trap_instr, env->active_tc.PC);
+
+                if (ret != 0) {
+                    abort();
+                    goto error;
+                }
+
+                /* The immediate versions don't provide a code. */
+                if (!(trap_instr & 0xFC000000)) {
+                    code = ((trap_instr >> 6) & ((1 << 10) - 1));
+                }
+
+                if (do_break(env, &info, code) != 0) {
+                    abort();
+                    goto error;
+                }
+            }
+            break;
+        case EXCP_ATOMIC:
+            cpu_exec_step_atomic(cs);
+            break;
+        default:
+error:
+            EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\n",
+                      trapnr);
+            abort();
+        }
+        process_pending_signals(env);
+    }
+}
+
+void target_cpu_copy_regs(CPUArchState *env, struct target_pt_regs *regs)
+{
+    int i;
+
+    for (i = 0; i < 32; i++) {
+        env->active_tc.gpr[i] = regs->regs[i];
+    }
+    env->active_tc.PC = regs->csr_era & ~(target_ulong)1;
+
+}
diff --git a/linux-user/loongarch64/signal.c b/linux-user/loongarch64/signal.c
new file mode 100644
index 0000000..716cee3
--- /dev/null
+++ b/linux-user/loongarch64/signal.c
@@ -0,0 +1,193 @@ 
+/*
+ * LoongArch emulation of Linux signals
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#include "qemu/osdep.h"
+#include "qemu.h"
+#include "signal-common.h"
+#include "linux-user/trace.h"
+
+#define FPU_REG_WIDTH   256
+union fpureg {
+    uint32_t   val32[FPU_REG_WIDTH / 32];
+    uint64_t   val64[FPU_REG_WIDTH / 64];
+};
+
+struct target_sigcontext {
+    uint64_t   sc_pc;
+    uint64_t   sc_regs[32];
+    uint32_t   sc_flags;
+
+    uint32_t   sc_fcsr;
+    uint32_t   sc_vcsr;
+    uint64_t   sc_fcc;
+    union fpureg    sc_fpregs[32] __attribute__((aligned(32)));
+
+    uint32_t   sc_reserved;
+
+};
+
+struct sigframe {
+    uint32_t sf_ass[4];             /* argument save space for o32 */
+    uint32_t sf_code[2];            /* signal trampoline */
+    struct target_sigcontext sf_sc;
+    target_sigset_t sf_mask;
+};
+
+struct target_ucontext {
+    target_ulong tuc_flags;
+    target_ulong tuc_link;
+    target_stack_t tuc_stack;
+    target_ulong pad0;
+    struct target_sigcontext tuc_mcontext;
+    target_sigset_t tuc_sigmask;
+};
+
+struct target_rt_sigframe {
+    uint32_t rs_ass[4];            /* argument save space for o32 */
+    uint32_t rs_code[2];           /* signal trampoline */
+    struct target_siginfo rs_info;
+    struct target_ucontext rs_uc;
+};
+
+/* Install trampoline to jump back from signal handler */
+static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall)
+{
+    int err = 0;
+
+    /*
+     * Set up the return code ...
+     *
+     *         li      a7, 139
+     *         syscall
+     */
+
+    __put_user(0x03822c0b, tramp + 0);  /* ori  a7, a7, 0x8b */
+    __put_user(0x002b0000, tramp + 1);  /* syscall 0 */
+    return err;
+}
+
+static inline void setup_sigcontext(CPULoongArchState *regs,
+                                    struct target_sigcontext *sc)
+{
+    int i;
+
+    __put_user(exception_resume_pc(regs), &sc->sc_pc);
+    regs->hflags &= ~LOONGARCH_HFLAG_BMASK;
+
+    __put_user(0, &sc->sc_regs[0]);
+    for (i = 1; i < 32; ++i) {
+        __put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
+    }
+
+    for (i = 0; i < 32; ++i) {
+        __put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i].val64[0]);
+    }
+}
+
+static inline void
+restore_sigcontext(CPULoongArchState *regs, struct target_sigcontext *sc)
+{
+    int i;
+
+    __get_user(regs->CSR_ERA, &sc->sc_pc);
+
+    for (i = 1; i < 32; ++i) {
+        __get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
+    }
+
+    for (i = 0; i < 32; ++i) {
+        __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i].val64[0]);
+    }
+}
+
+/*
+ * Determine which stack to use..
+ */
+static inline abi_ulong
+get_sigframe(struct target_sigaction *ka, CPULoongArchState *regs,
+             size_t frame_size)
+{
+    unsigned long sp;
+
+    sp = target_sigsp(get_sp_from_cpustate(regs) - 32, ka);
+
+    return (sp - frame_size) & ~7;
+}
+
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPULoongArchState *env)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+    int i;
+
+    frame_addr = get_sigframe(ka, env, sizeof(*frame));
+    trace_user_setup_rt_frame(env, frame_addr);
+    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+        goto give_sigsegv;
+    }
+
+    install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
+
+    tswap_siginfo(&frame->rs_info, info);
+
+    __put_user(0, &frame->rs_uc.tuc_flags);
+    __put_user(0, &frame->rs_uc.tuc_link);
+    target_save_altstack(&frame->rs_uc.tuc_stack, env);
+
+    setup_sigcontext(env, &frame->rs_uc.tuc_mcontext);
+
+    for (i = 0; i < TARGET_NSIG_WORDS; i++) {
+        __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]);
+    }
+
+    env->active_tc.gpr[4] = sig;
+    env->active_tc.gpr[5] = frame_addr
+                             + offsetof(struct target_rt_sigframe, rs_info);
+    env->active_tc.gpr[6] = frame_addr
+                             + offsetof(struct target_rt_sigframe, rs_uc);
+    env->active_tc.gpr[3] = frame_addr;
+    env->active_tc.gpr[1] = frame_addr
+                             + offsetof(struct target_rt_sigframe, rs_code);
+
+    env->active_tc.PC = env->active_tc.gpr[20] = ka->_sa_handler;
+    unlock_user_struct(frame, frame_addr, 1);
+    return;
+
+give_sigsegv:
+    unlock_user_struct(frame, frame_addr, 1);
+    force_sigsegv(sig);
+}
+
+long do_rt_sigreturn(CPULoongArchState *env)
+{
+    struct target_rt_sigframe *frame;
+    abi_ulong frame_addr;
+    sigset_t blocked;
+
+    frame_addr = env->active_tc.gpr[3];
+    trace_user_do_rt_sigreturn(env, frame_addr);
+    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
+        goto badframe;
+    }
+
+    target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
+    set_sigmask(&blocked);
+
+    restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
+    target_restore_altstack(&frame->rs_uc.tuc_stack, env);
+
+    env->active_tc.PC = env->CSR_ERA;
+    env->CSR_ERA = 0;
+    return -TARGET_QEMU_ESIGRETURN;
+
+badframe:
+    force_sig(TARGET_SIGSEGV);
+    return -TARGET_QEMU_ESIGRETURN;
+}
diff --git a/linux-user/loongarch64/sockbits.h b/linux-user/loongarch64/sockbits.h
new file mode 100644
index 0000000..0e4c8f0
--- /dev/null
+++ b/linux-user/loongarch64/sockbits.h
@@ -0,0 +1 @@ 
+#include "../generic/sockbits.h"
diff --git a/linux-user/loongarch64/syscall_nr.h b/linux-user/loongarch64/syscall_nr.h
new file mode 100644
index 0000000..64cb17d
--- /dev/null
+++ b/linux-user/loongarch64/syscall_nr.h
@@ -0,0 +1,307 @@ 
+#ifndef LINUX_USER_LOONGARCH_SYSCALL_NR_H
+#define LINUX_USER_LOONGARCH_SYSCALL_NR_H
+
+/* copy from kernel: include/uapi/asm-generic/unistd.h */
+#define TARGET_NR_io_setup 0
+#define TARGET_NR_io_destroy 1
+#define TARGET_NR_io_submit 2
+#define TARGET_NR_io_cancel 3
+#define TARGET_NR_io_getevents 4
+#define TARGET_NR_setxattr 5
+#define TARGET_NR_lsetxattr 6
+#define TARGET_NR_fsetxattr 7
+#define TARGET_NR_getxattr 8
+#define TARGET_NR_lgetxattr 9
+#define TARGET_NR_fgetxattr 10
+#define TARGET_NR_listxattr 11
+#define TARGET_NR_llistxattr 12
+#define TARGET_NR_flistxattr 13
+#define TARGET_NR_removexattr 14
+#define TARGET_NR_lremovexattr 15
+#define TARGET_NR_fremovexattr 16
+#define TARGET_NR_getcwd 17
+#define TARGET_NR_lookup_dcookie 18
+#define TARGET_NR_eventfd2 19
+#define TARGET_NR_epoll_create1 20
+#define TARGET_NR_epoll_ctl 21
+#define TARGET_NR_epoll_pwait 22
+#define TARGET_NR_dup 23
+#define TARGET_NR_dup3 24
+#define TARGET_NR_fcntl 25
+#define TARGET_NR_inotify_init1 26
+#define TARGET_NR_inotify_add_watch 27
+#define TARGET_NR_inotify_rm_watch 28
+#define TARGET_NR_ioctl 29
+#define TARGET_NR_ioprio_set 30
+#define TARGET_NR_ioprio_get 31
+#define TARGET_NR_flock 32
+#define TARGET_NR_mknodat 33
+#define TARGET_NR_mkdirat 34
+#define TARGET_NR_unlinkat 35
+#define TARGET_NR_symlinkat 36
+#define TARGET_NR_linkat 37
+#define TARGET_NR_renameat 38
+#define TARGET_NR_umount2 39
+#define TARGET_NR_mount 40
+#define TARGET_NR_pivot_root 41
+#define TARGET_NR_nfsservctl 42
+#define TARGET_NR_statfs 43
+#define TARGET_NR_fstatfs 44
+#define TARGET_NR_truncate 45
+#define TARGET_NR_ftruncate 46
+#define TARGET_NR_fallocate 47
+#define TARGET_NR_faccessat 48
+#define TARGET_NR_chdir 49
+#define TARGET_NR_fchdir 50
+#define TARGET_NR_chroot 51
+#define TARGET_NR_fchmod 52
+#define TARGET_NR_fchmodat 53
+#define TARGET_NR_fchownat 54
+#define TARGET_NR_fchown 55
+#define TARGET_NR_openat 56
+#define TARGET_NR_close 57
+#define TARGET_NR_vhangup 58
+#define TARGET_NR_pipe2 59
+#define TARGET_NR_quotactl 60
+#define TARGET_NR_getdents64 61
+#define TARGET_NR_lseek 62
+#define TARGET_NR_read 63
+#define TARGET_NR_write 64
+#define TARGET_NR_readv 65
+#define TARGET_NR_writev 66
+#define TARGET_NR_pread64 67
+#define TARGET_NR_pwrite64 68
+#define TARGET_NR_preadv 69
+#define TARGET_NR_pwritev 70
+#define TARGET_NR_sendfile 71
+#define TARGET_NR_pselect6 72
+#define TARGET_NR_ppoll 73
+#define TARGET_NR_signalfd4 74
+#define TARGET_NR_vmsplice 75
+#define TARGET_NR_splice 76
+#define TARGET_NR_tee 77
+#define TARGET_NR_readlinkat 78
+#define TARGET_NR_newfstatat 79
+#define TARGET_NR_fstat 80
+#define TARGET_NR_sync 81
+#define TARGET_NR_fsync 82
+#define TARGET_NR_fdatasync 83
+#define TARGET_NR_sync_file_range 84
+#define TARGET_NR_timerfd_create 85
+#define TARGET_NR_timerfd_settime 86
+#define TARGET_NR_timerfd_gettime 87
+#define TARGET_NR_utimensat 88
+#define TARGET_NR_acct 89
+#define TARGET_NR_capget 90
+#define TARGET_NR_capset 91
+#define TARGET_NR_personality 92
+#define TARGET_NR_exit 93
+#define TARGET_NR_exit_group 94
+#define TARGET_NR_waitid 95
+#define TARGET_NR_set_tid_address 96
+#define TARGET_NR_unshare 97
+#define TARGET_NR_futex 98
+#define TARGET_NR_set_robust_list 99
+#define TARGET_NR_get_robust_list 100
+#define TARGET_NR_nanosleep 101
+#define TARGET_NR_getitimer 102
+#define TARGET_NR_setitimer 103
+#define TARGET_NR_kexec_load 104
+#define TARGET_NR_init_module 105
+#define TARGET_NR_delete_module 106
+#define TARGET_NR_timer_create 107
+#define TARGET_NR_timer_gettime 108
+#define TARGET_NR_timer_getoverrun 109
+#define TARGET_NR_timer_settime 110
+#define TARGET_NR_timer_delete 111
+#define TARGET_NR_clock_settime 112
+#define TARGET_NR_clock_gettime 113
+#define TARGET_NR_clock_getres 114
+#define TARGET_NR_clock_nanosleep 115
+#define TARGET_NR_syslog 116
+#define TARGET_NR_ptrace 117
+#define TARGET_NR_sched_setparam 118
+#define TARGET_NR_sched_setscheduler 119
+#define TARGET_NR_sched_getscheduler 120
+#define TARGET_NR_sched_getparam 121
+#define TARGET_NR_sched_setaffinity 122
+#define TARGET_NR_sched_getaffinity 123
+#define TARGET_NR_sched_yield 124
+#define TARGET_NR_sched_get_priority_max 125
+#define TARGET_NR_sched_get_priority_min 126
+#define TARGET_NR_sched_rr_get_interval 127
+#define TARGET_NR_restart_syscall 128
+#define TARGET_NR_kill 129
+#define TARGET_NR_tkill 130
+#define TARGET_NR_tgkill 131
+#define TARGET_NR_sigaltstack 132
+#define TARGET_NR_rt_sigsuspend 133
+#define TARGET_NR_rt_sigaction 134
+#define TARGET_NR_rt_sigprocmask 135
+#define TARGET_NR_rt_sigpending 136
+#define TARGET_NR_rt_sigtimedwait 137
+#define TARGET_NR_rt_sigqueueinfo 138
+#define TARGET_NR_rt_sigreturn 139
+#define TARGET_NR_setpriority 140
+#define TARGET_NR_getpriority 141
+#define TARGET_NR_reboot 142
+#define TARGET_NR_setregid 143
+#define TARGET_NR_setgid 144
+#define TARGET_NR_setreuid 145
+#define TARGET_NR_setuid 146
+#define TARGET_NR_setresuid 147
+#define TARGET_NR_getresuid 148
+#define TARGET_NR_setresgid 149
+#define TARGET_NR_getresgid 150
+#define TARGET_NR_setfsuid 151
+#define TARGET_NR_setfsgid 152
+#define TARGET_NR_times 153
+#define TARGET_NR_setpgid 154
+#define TARGET_NR_getpgid 155
+#define TARGET_NR_getsid 156
+#define TARGET_NR_setsid 157
+#define TARGET_NR_getgroups 158
+#define TARGET_NR_setgroups 159
+#define TARGET_NR_uname 160
+#define TARGET_NR_sethostname 161
+#define TARGET_NR_setdomainname 162
+#define TARGET_NR_getrlimit 163
+#define TARGET_NR_setrlimit 164
+#define TARGET_NR_getrusage 165
+#define TARGET_NR_umask 166
+#define TARGET_NR_prctl 167
+#define TARGET_NR_getcpu 168
+#define TARGET_NR_gettimeofday 169
+#define TARGET_NR_settimeofday 170
+#define TARGET_NR_adjtimex 171
+#define TARGET_NR_getpid 172
+#define TARGET_NR_getppid 173
+#define TARGET_NR_getuid 174
+#define TARGET_NR_geteuid 175
+#define TARGET_NR_getgid 176
+#define TARGET_NR_getegid 177
+#define TARGET_NR_gettid 178
+#define TARGET_NR_sysinfo 179
+#define TARGET_NR_mq_open 180
+#define TARGET_NR_mq_unlink 181
+#define TARGET_NR_mq_timedsend 182
+#define TARGET_NR_mq_timedreceive 183
+#define TARGET_NR_mq_notify 184
+#define TARGET_NR_mq_getsetattr 185
+#define TARGET_NR_msgget 186
+#define TARGET_NR_msgctl 187
+#define TARGET_NR_msgrcv 188
+#define TARGET_NR_msgsnd 189
+#define TARGET_NR_semget 190
+#define TARGET_NR_semctl 191
+#define TARGET_NR_semtimedop 192
+#define TARGET_NR_semop 193
+#define TARGET_NR_shmget 194
+#define TARGET_NR_shmctl 195
+#define TARGET_NR_shmat 196
+#define TARGET_NR_shmdt 197
+#define TARGET_NR_socket 198
+#define TARGET_NR_socketpair 199
+#define TARGET_NR_bind 200
+#define TARGET_NR_listen 201
+#define TARGET_NR_accept 202
+#define TARGET_NR_connect 203
+#define TARGET_NR_getsockname 204
+#define TARGET_NR_getpeername 205
+#define TARGET_NR_sendto 206
+#define TARGET_NR_recvfrom 207
+#define TARGET_NR_setsockopt 208
+#define TARGET_NR_getsockopt 209
+#define TARGET_NR_shutdown 210
+#define TARGET_NR_sendmsg 211
+#define TARGET_NR_recvmsg 212
+#define TARGET_NR_readahead 213
+#define TARGET_NR_brk 214
+#define TARGET_NR_munmap 215
+#define TARGET_NR_mremap 216
+#define TARGET_NR_add_key 217
+#define TARGET_NR_request_key 218
+#define TARGET_NR_keyctl 219
+#define TARGET_NR_clone 220
+#define TARGET_NR_execve 221
+#define TARGET_NR_mmap 222
+#define TARGET_NR_fadvise64 223
+#define TARGET_NR_swapon 224
+#define TARGET_NR_swapoff 225
+#define TARGET_NR_mprotect 226
+#define TARGET_NR_msync 227
+#define TARGET_NR_mlock 228
+#define TARGET_NR_munlock 229
+#define TARGET_NR_mlockall 230
+#define TARGET_NR_munlockall 231
+#define TARGET_NR_mincore 232
+#define TARGET_NR_madvise 233
+#define TARGET_NR_remap_file_pages 234
+#define TARGET_NR_mbind 235
+#define TARGET_NR_get_mempolicy 236
+#define TARGET_NR_set_mempolicy 237
+#define TARGET_NR_migrate_pages 238
+#define TARGET_NR_move_pages 239
+#define TARGET_NR_rt_tgsigqueueinfo 240
+#define TARGET_NR_perf_event_open 241
+#define TARGET_NR_accept4 242
+#define TARGET_NR_recvmmsg 243
+#define TARGET_NR_arch_specific_syscall 244
+#define TARGET_NR_wait4 260
+#define TARGET_NR_prlimit64 261
+#define TARGET_NR_fanotify_init 262
+#define TARGET_NR_fanotify_mark 263
+#define TARGET_NR_name_to_handle_at 264
+#define TARGET_NR_open_by_handle_at 265
+#define TARGET_NR_clock_adjtime 266
+#define TARGET_NR_syncfs 267
+#define TARGET_NR_setns 268
+#define TARGET_NR_sendmmsg 269
+#define TARGET_NR_process_vm_readv 270
+#define TARGET_NR_process_vm_writev 271
+#define TARGET_NR_kcmp 272
+#define TARGET_NR_finit_module 273
+#define TARGET_NR_sched_setattr 274
+#define TARGET_NR_sched_getattr 275
+#define TARGET_NR_renameat2 276
+#define TARGET_NR_seccomp 277
+#define TARGET_NR_getrandom 278
+#define TARGET_NR_memfd_create 279
+#define TARGET_NR_bpf 280
+#define TARGET_NR_execveat 281
+#define TARGET_NR_userfaultfd 282
+#define TARGET_NR_membarrier 283
+#define TARGET_NR_mlock2 284
+#define TARGET_NR_copy_file_range 285
+#define TARGET_NR_preadv2 286
+#define TARGET_NR_pwritev2 287
+#define TARGET_NR_pkey_mprotect 288
+#define TARGET_NR_pkey_alloc 289
+#define TARGET_NR_pkey_free 290
+#define TARGET_NR_statx 291
+#define TARGET_NR_io_pgetevents 292
+#define TARGET_NR_rseq 293
+#define TARGET_NR_kexec_file_load 294
+#define TARGET_NR_pidfd_send_signal 424
+#define TARGET_NR_io_uring_setup 425
+#define TARGET_NR_io_uring_enter 426
+#define TARGET_NR_io_uring_register 427
+#define TARGET_NR_open_tree 428
+#define TARGET_NR_move_mount 429
+#define TARGET_NR_fsopen 430
+#define TARGET_NR_fsconfig 431
+#define TARGET_NR_fsmount 432
+#define TARGET_NR_fspick 433
+#define TARGET_NR_pidfd_open 434
+#define TARGET_NR_clone3 435
+#define TARGET_NR_close_range 436
+#define TARGET_NR_openat2 437
+#define TARGET_NR_pidfd_getfd 438
+#define TARGET_NR_faccessat2 439
+#define TARGET_NR_process_madvise 440
+#define TARGET_NR_epoll_pwait2 441
+#define TARGET_NR_mount_setattr 442
+
+#define TARGET_NR_syscalls 443
+
+#endif
diff --git a/linux-user/loongarch64/target_cpu.h b/linux-user/loongarch64/target_cpu.h
new file mode 100644
index 0000000..c4c06dd
--- /dev/null
+++ b/linux-user/loongarch64/target_cpu.h
@@ -0,0 +1,36 @@ 
+/*
+ * LoongArch specific CPU ABI and functions for linux-user
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef LOONGARCH_TARGET_CPU_H
+#define LOONGARCH_TARGET_CPU_H
+
+static inline void cpu_clone_regs_child(CPULoongArchState *env,
+                                        target_ulong newsp, unsigned flags)
+{
+    if (newsp) {
+        env->active_tc.gpr[3] = newsp;
+    }
+    env->active_tc.gpr[7] = 0;
+    env->active_tc.gpr[4] = 0;
+}
+
+static inline void cpu_clone_regs_parent(CPULoongArchState *env,
+                                         unsigned flags)
+{
+}
+
+static inline void cpu_set_tls(CPULoongArchState *env, target_ulong newtls)
+{
+    env->active_tc.gpr[2] = newtls;
+}
+
+static inline abi_ulong get_sp_from_cpustate(CPULoongArchState *state)
+{
+    return state->active_tc.gpr[3];
+}
+#endif
diff --git a/linux-user/loongarch64/target_elf.h b/linux-user/loongarch64/target_elf.h
new file mode 100644
index 0000000..7c88394
--- /dev/null
+++ b/linux-user/loongarch64/target_elf.h
@@ -0,0 +1,14 @@ 
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+
+#ifndef LOONGARCH_TARGET_ELF_H
+#define LOONGARCH_TARGET_ELF_H
+static inline const char *cpu_get_model(uint32_t eflags)
+{
+    return "Loongson-3A5000";
+}
+#endif
diff --git a/linux-user/loongarch64/target_fcntl.h b/linux-user/loongarch64/target_fcntl.h
new file mode 100644
index 0000000..b810293
--- /dev/null
+++ b/linux-user/loongarch64/target_fcntl.h
@@ -0,0 +1,12 @@ 
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef LOONGARCH_TARGET_FCNTL_H
+#define LOONGARCH_TARGET_FCNTL_H
+
+#include "../generic/fcntl.h"
+
+#endif  /* LOONGARCH_TARGET_FCNTL_H */
diff --git a/linux-user/loongarch64/target_signal.h b/linux-user/loongarch64/target_signal.h
new file mode 100644
index 0000000..713c26a
--- /dev/null
+++ b/linux-user/loongarch64/target_signal.h
@@ -0,0 +1,28 @@ 
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef LOONGARCH_TARGET_SIGNAL_H
+#define LOONGARCH_TARGET_SIGNAL_H
+
+/* this struct defines a stack used during syscall handling */
+typedef struct target_sigaltstack {
+        abi_long ss_sp;
+        abi_int ss_flags;
+        abi_ulong ss_size;
+} target_stack_t;
+
+/*
+ * sigaltstack controls
+ */
+#define TARGET_SS_ONSTACK     1
+#define TARGET_SS_DISABLE     2
+
+#define TARGET_MINSIGSTKSZ    2048
+#define TARGET_SIGSTKSZ       8192
+
+#include "../generic/signal.h"
+
+#endif /* LOONGARCH_TARGET_SIGNAL_H */
diff --git a/linux-user/loongarch64/target_structs.h b/linux-user/loongarch64/target_structs.h
new file mode 100644
index 0000000..818e8d6
--- /dev/null
+++ b/linux-user/loongarch64/target_structs.h
@@ -0,0 +1,49 @@ 
+/*
+ * LoongArch specific structures for linux-user
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef LOONGARCH_TARGET_STRUCTS_H
+#define LOONGARCH_TARGET_STRUCTS_H
+
+struct target_ipc_perm {
+    abi_int __key;                      /* Key.  */
+    abi_uint uid;                       /* Owner's user ID.  */
+    abi_uint gid;                       /* Owner's group ID.  */
+    abi_uint cuid;                      /* Creator's user ID.  */
+    abi_uint cgid;                      /* Creator's group ID.  */
+    abi_uint mode;                      /* Read/write permission.  */
+    abi_ushort __seq;                   /* Sequence number.  */
+    abi_ushort __pad1;
+    abi_ulong __unused1;
+    abi_ulong __unused2;
+};
+
+struct target_shmid_ds {
+    struct target_ipc_perm shm_perm;    /* operation permission struct */
+    abi_long shm_segsz;                 /* size of segment in bytes */
+    abi_ulong shm_atime;                /* time of last shmat() */
+    abi_ulong shm_dtime;                /* time of last shmdt() */
+    abi_ulong shm_ctime;                /* time of last change by shmctl() */
+    abi_int shm_cpid;                   /* pid of creator */
+    abi_int shm_lpid;                   /* pid of last shmop */
+    abi_ulong shm_nattch;               /* number of current attaches */
+    abi_ulong __unused1;
+    abi_ulong __unused2;
+};
+
+#define TARGET_SEMID64_DS
+
+struct target_semid64_ds {
+    struct target_ipc_perm sem_perm;
+    abi_ulong sem_otime;
+    abi_ulong sem_ctime;
+    abi_ulong sem_nsems;
+    abi_ulong __unused1;
+    abi_ulong __unused2;
+};
+
+#endif
diff --git a/linux-user/loongarch64/target_syscall.h b/linux-user/loongarch64/target_syscall.h
new file mode 100644
index 0000000..b98ac12
--- /dev/null
+++ b/linux-user/loongarch64/target_syscall.h
@@ -0,0 +1,46 @@ 
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+
+#ifndef LOONGARCH_TARGET_SYSCALL_H
+#define LOONGARCH_TARGET_SYSCALL_H
+
+/*
+ * this struct defines the way the registers are stored on the
+ * stack during a system call.
+ */
+
+struct target_pt_regs {
+    /* Saved main processor registers. */
+    target_ulong regs[32];
+
+    /* Saved special registers. */
+    target_ulong csr_crmd;
+    target_ulong csr_prmd;
+    target_ulong csr_euen;
+    target_ulong csr_ecfg;
+    target_ulong csr_estat;
+    target_ulong csr_era;
+    target_ulong csr_badvaddr;
+    target_ulong orig_a0;
+    target_ulong __last[0];
+};
+
+#define UNAME_MACHINE "loongarch"
+#define UNAME_MINIMUM_RELEASE "4.19.0"
+
+#define TARGET_MINSIGSTKSZ 2048
+#define TARGET_MCL_CURRENT 1
+#define TARGET_MCL_FUTURE  2
+#define TARGET_MCL_ONFAULT 4
+
+#define TARGET_FORCE_SHMLBA
+
+static inline abi_ulong target_shmlba(CPULoongArchState *env)
+{
+    return 0x40000;
+}
+
+#endif
diff --git a/linux-user/loongarch64/termbits.h b/linux-user/loongarch64/termbits.h
new file mode 100644
index 0000000..33e74ed
--- /dev/null
+++ b/linux-user/loongarch64/termbits.h
@@ -0,0 +1,229 @@ 
+#ifndef LINUX_USER_LOONGARCH_TERMBITS_H
+#define LINUX_USER_LOONGARCH_TERMBITS_H
+
+#define TARGET_NCCS 19
+
+typedef unsigned char   target_cc_t;        /* cc_t */
+typedef unsigned int    target_speed_t;     /* speed_t */
+typedef unsigned int    target_tcflag_t;    /* tcflag_t */
+
+struct target_termios {
+    target_tcflag_t c_iflag;               /* input mode flags */
+    target_tcflag_t c_oflag;               /* output mode flags */
+    target_tcflag_t c_cflag;               /* control mode flags */
+    target_tcflag_t c_lflag;               /* local mode flags */
+    target_cc_t c_line;                    /* line discipline */
+    target_cc_t c_cc[TARGET_NCCS];         /* control characters */
+};
+
+/* c_iflag bits */
+#define TARGET_IGNBRK  0000001
+#define TARGET_BRKINT  0000002
+#define TARGET_IGNPAR  0000004
+#define TARGET_PARMRK  0000010
+#define TARGET_INPCK   0000020
+#define TARGET_ISTRIP  0000040
+#define TARGET_INLCR   0000100
+#define TARGET_IGNCR   0000200
+#define TARGET_ICRNL   0000400
+#define TARGET_IUCLC   0001000
+#define TARGET_IXON    0002000
+#define TARGET_IXANY   0004000
+#define TARGET_IXOFF   0010000
+#define TARGET_IMAXBEL 0020000
+#define TARGET_IUTF8   0040000
+
+/* c_oflag bits */
+#define TARGET_OPOST   0000001
+#define TARGET_OLCUC   0000002
+#define TARGET_ONLCR   0000004
+#define TARGET_OCRNL   0000010
+#define TARGET_ONOCR   0000020
+#define TARGET_ONLRET  0000040
+#define TARGET_OFILL   0000100
+#define TARGET_OFDEL   0000200
+#define TARGET_NLDLY   0000400
+#define   TARGET_NL0   0000000
+#define   TARGET_NL1   0000400
+#define TARGET_CRDLY   0003000
+#define   TARGET_CR0   0000000
+#define   TARGET_CR1   0001000
+#define   TARGET_CR2   0002000
+#define   TARGET_CR3   0003000
+#define TARGET_TABDLY  0014000
+#define   TARGET_TAB0  0000000
+#define   TARGET_TAB1  0004000
+#define   TARGET_TAB2  0010000
+#define   TARGET_TAB3  0014000
+#define   TARGET_XTABS 0014000
+#define TARGET_BSDLY   0020000
+#define   TARGET_BS0   0000000
+#define   TARGET_BS1   0020000
+#define TARGET_VTDLY   0040000
+#define   TARGET_VT0   0000000
+#define   TARGET_VT1   0040000
+#define TARGET_FFDLY   0100000
+#define   TARGET_FF0   0000000
+#define   TARGET_FF1   0100000
+
+/* c_cflag bit meaning */
+#define TARGET_CBAUD   0010017
+#define  TARGET_B0     0000000         /* hang up */
+#define  TARGET_B50    0000001
+#define  TARGET_B75    0000002
+#define  TARGET_B110   0000003
+#define  TARGET_B134   0000004
+#define  TARGET_B150   0000005
+#define  TARGET_B200   0000006
+#define  TARGET_B300   0000007
+#define  TARGET_B600   0000010
+#define  TARGET_B1200  0000011
+#define  TARGET_B1800  0000012
+#define  TARGET_B2400  0000013
+#define  TARGET_B4800  0000014
+#define  TARGET_B9600  0000015
+#define  TARGET_B19200 0000016
+#define  TARGET_B38400 0000017
+#define TARGET_EXTA B19200
+#define TARGET_EXTB B38400
+#define TARGET_CSIZE   0000060
+#define   TARGET_CS5   0000000
+#define   TARGET_CS6   0000020
+#define   TARGET_CS7   0000040
+#define   TARGET_CS8   0000060
+#define TARGET_CSTOPB  0000100
+#define TARGET_CREAD   0000200
+#define TARGET_PARENB  0000400
+#define TARGET_PARODD  0001000
+#define TARGET_HUPCL   0002000
+#define TARGET_CLOCAL  0004000
+#define TARGET_CBAUDEX 0010000
+#define  TARGET_B57600  0010001
+#define  TARGET_B115200 0010002
+#define  TARGET_B230400 0010003
+#define  TARGET_B460800 0010004
+#define TARGET_CIBAUD    002003600000  /* input baud rate (not used) */
+#define TARGET_CMSPAR    010000000000  /* mark or space (stick) parity */
+#define TARGET_CRTSCTS   020000000000  /* flow control */
+
+/* c_lflag bits */
+#define TARGET_ISIG    0000001
+#define TARGET_ICANON  0000002
+#define TARGET_XCASE   0000004
+#define TARGET_ECHO    0000010
+#define TARGET_ECHOE   0000020
+#define TARGET_ECHOK   0000040
+#define TARGET_ECHONL  0000100
+#define TARGET_NOFLSH  0000200
+#define TARGET_TOSTOP  0000400
+#define TARGET_ECHOCTL 0001000
+#define TARGET_ECHOPRT 0002000
+#define TARGET_ECHOKE  0004000
+#define TARGET_FLUSHO  0010000
+#define TARGET_PENDIN  0040000
+#define TARGET_IEXTEN  0100000
+#define TARGET_EXTPROC 0200000
+
+/* c_cc character offsets */
+#define TARGET_VINTR    0
+#define TARGET_VQUIT    1
+#define TARGET_VERASE   2
+#define TARGET_VKILL    3
+#define TARGET_VEOF     4
+#define TARGET_VTIME    5
+#define TARGET_VMIN     6
+#define TARGET_VSWTC    7
+#define TARGET_VSTART   8
+#define TARGET_VSTOP    9
+#define TARGET_VSUSP    10
+#define TARGET_VEOL     11
+#define TARGET_VREPRINT 12
+#define TARGET_VDISCARD 13
+#define TARGET_VWERASE  14
+#define TARGET_VLNEXT   15
+#define TARGET_VEOL2    16
+
+/* ioctls */
+
+#define TARGET_TCGETS           0x5401
+#define TARGET_TCSETS           0x5402
+#define TARGET_TCSETSW          0x5403
+#define TARGET_TCSETSF          0x5404
+#define TARGET_TCGETA           0x5405
+#define TARGET_TCSETA           0x5406
+#define TARGET_TCSETAW          0x5407
+#define TARGET_TCSETAF          0x5408
+#define TARGET_TCSBRK           0x5409
+#define TARGET_TCXONC           0x540A
+#define TARGET_TCFLSH           0x540B
+
+#define TARGET_TIOCEXCL         0x540C
+#define TARGET_TIOCNXCL         0x540D
+#define TARGET_TIOCSCTTY        0x540E
+#define TARGET_TIOCGPGRP        0x540F
+#define TARGET_TIOCSPGRP        0x5410
+#define TARGET_TIOCOUTQ         0x5411
+#define TARGET_TIOCSTI          0x5412
+#define TARGET_TIOCGWINSZ       0x5413
+#define TARGET_TIOCSWINSZ       0x5414
+#define TARGET_TIOCMGET         0x5415
+#define TARGET_TIOCMBIS         0x5416
+#define TARGET_TIOCMBIC         0x5417
+#define TARGET_TIOCMSET         0x5418
+#define TARGET_TIOCGSOFTCAR     0x5419
+#define TARGET_TIOCSSOFTCAR     0x541A
+#define TARGET_FIONREAD         0x541B
+#define TARGET_TIOCINQ          TARGET_FIONREAD
+#define TARGET_TIOCLINUX        0x541C
+#define TARGET_TIOCCONS         0x541D
+#define TARGET_TIOCGSERIAL      0x541E
+#define TARGET_TIOCSSERIAL      0x541F
+#define TARGET_TIOCPKT          0x5420
+#define TARGET_FIONBIO          0x5421
+#define TARGET_TIOCNOTTY        0x5422
+#define TARGET_TIOCSETD         0x5423
+#define TARGET_TIOCGETD         0x5424
+#define TARGET_TCSBRKP          0x5425 /* Needed for POSIX tcsendbreak() */
+#define TARGET_TIOCTTYGSTRUCT   0x5426 /* For debugging only */
+#define TARGET_TIOCSBRK         0x5427 /* BSD compatibility */
+#define TARGET_TIOCCBRK         0x5428 /* BSD compatibility */
+#define TARGET_TIOCGSID         0x5429 /* Return the session ID of FD */
+#define TARGET_TIOCGPTN         TARGET_IOR('T', 0x30, unsigned int)
+        /* Get Pty Number (of pty-mux device) */
+#define TARGET_TIOCSPTLCK       TARGET_IOW('T', 0x31, int)
+        /* Lock/unlock Pty */
+#define TARGET_TIOCGPTPEER      TARGET_IO('T', 0x41)
+        /* Safely open the slave */
+
+#define TARGET_FIONCLEX         0x5450  /* these numbers need to be adjusted. */
+#define TARGET_FIOCLEX          0x5451
+#define TARGET_FIOASYNC         0x5452
+#define TARGET_TIOCSERCONFIG    0x5453
+#define TARGET_TIOCSERGWILD     0x5454
+#define TARGET_TIOCSERSWILD     0x5455
+#define TARGET_TIOCGLCKTRMIOS   0x5456
+#define TARGET_TIOCSLCKTRMIOS   0x5457
+#define TARGET_TIOCSERGSTRUCT   0x5458 /* For debugging only */
+#define TARGET_TIOCSERGETLSR    0x5459 /* Get line status register */
+#define TARGET_TIOCSERGETMULTI  0x545A /* Get multiport config  */
+#define TARGET_TIOCSERSETMULTI  0x545B /* Set multiport config */
+
+#define TARGET_TIOCMIWAIT      0x545C
+        /* wait for a change on serial input line(s) */
+#define TARGET_TIOCGICOUNT     0x545D
+        /* read serial port inline interrupt counts */
+#define TARGET_TIOCGHAYESESP   0x545E  /* Get Hayes ESP configuration */
+#define TARGET_TIOCSHAYESESP   0x545F  /* Set Hayes ESP configuration */
+
+/* Used for packet mode */
+#define TARGET_TIOCPKT_DATA              0
+#define TARGET_TIOCPKT_FLUSHREAD         1
+#define TARGET_TIOCPKT_FLUSHWRITE        2
+#define TARGET_TIOCPKT_STOP              4
+#define TARGET_TIOCPKT_START             8
+#define TARGET_TIOCPKT_NOSTOP           16
+#define TARGET_TIOCPKT_DOSTOP           32
+
+#define TARGET_TIOCSER_TEMT    0x01 /* Transmitter physically empty */
+
+#endif
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 18b031a..cc263e9 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -74,7 +74,7 @@ 
     || defined(TARGET_M68K) || defined(TARGET_CRIS) \
     || defined(TARGET_S390X) || defined(TARGET_OPENRISC) \
     || defined(TARGET_NIOS2) || defined(TARGET_RISCV) \
-    || defined(TARGET_XTENSA)
+    || defined(TARGET_XTENSA) || defined(TARGET_LOONGARCH64)
 
 #define TARGET_IOC_SIZEBITS	14
 #define TARGET_IOC_DIRBITS	2
@@ -2129,7 +2129,8 @@  struct target_stat64  {
     abi_ulong __unused5;
 };
 
-#elif defined(TARGET_OPENRISC) || defined(TARGET_NIOS2) || defined(TARGET_RISCV)
+#elif defined(TARGET_OPENRISC) || defined(TARGET_NIOS2) || \
+      defined(TARGET_RISCV) || defined(TARGET_LOONGARCH64)
 
 /* These are the asm-generic versions of the stat and stat64 structures */
 
@@ -2327,7 +2328,8 @@  struct target_statfs64 {
 };
 #elif (defined(TARGET_PPC64) || defined(TARGET_X86_64) || \
        defined(TARGET_SPARC64) || defined(TARGET_AARCH64) || \
-       defined(TARGET_RISCV)) && !defined(TARGET_ABI32)
+       defined(TRAGET_RISCV) || defined(TARGET_LOONGARCH64)) && \
+       !defined(TARGET_ABI32)
 struct target_statfs {
 	abi_long f_type;
 	abi_long f_bsize;
diff --git a/meson.build b/meson.build
index 0211442..5f46f21 100644
--- a/meson.build
+++ b/meson.build
@@ -57,7 +57,7 @@  python = import('python').find_installation()
 
 supported_oses = ['windows', 'freebsd', 'netbsd', 'openbsd', 'darwin', 'sunos', 'linux']
 supported_cpus = ['ppc', 'ppc64', 's390x', 'riscv32', 'riscv64', 'x86', 'x86_64',
-  'arm', 'aarch64', 'mips', 'mips64', 'sparc', 'sparc64']
+  'arm', 'aarch64', 'mips', 'mips64', 'sparc', 'sparc64', 'loongarch64']
 
 cpu = host_machine.cpu_family()
 targetos = host_machine.system()
diff --git a/qapi/machine-target.json b/qapi/machine-target.json
index e781165..22a4c4a 100644
--- a/qapi/machine-target.json
+++ b/qapi/machine-target.json
@@ -316,7 +316,7 @@ 
             'typename': 'str',
             '*alias-of' : 'str',
             'deprecated' : 'bool' },
-  'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS)' }
+  'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS) || defined(TARGET_LOONGARCH)' }
 
 ##
 # @query-cpu-definitions:
@@ -328,4 +328,4 @@ 
 # Since: 1.2
 ##
 { 'command': 'query-cpu-definitions', 'returns': ['CpuDefinitionInfo'],
-  'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS)' }
+  'if': 'defined(TARGET_PPC) || defined(TARGET_ARM) || defined(TARGET_I386) || defined(TARGET_S390X) || defined(TARGET_MIPS) || defined(TARGET_LOONGARCH)' }
diff --git a/target/loongarch/meson.build b/target/loongarch/meson.build
new file mode 100644
index 0000000..54d5ca2
--- /dev/null
+++ b/target/loongarch/meson.build
@@ -0,0 +1,19 @@ 
+gen = decodetree.process('insns.decode')
+
+loongarch_ss = ss.source_set()
+loongarch_ss.add(files(
+  'cpu.c',
+))
+loongarch_tcg_ss = ss.source_set()
+loongarch_tcg_ss.add(gen)
+loongarch_tcg_ss.add(files(
+  'fpu_helper.c',
+  'op_helper.c',
+  'tlb_helper.c',
+  'translate.c',
+))
+loongarch_tcg_ss.add(zlib)
+
+loongarch_ss.add_all(when: 'CONFIG_TCG', if_true: [loongarch_tcg_ss])
+
+target_arch += {'loongarch': loongarch_ss}
diff --git a/target/meson.build b/target/meson.build
index 2f69402..a53a604 100644
--- a/target/meson.build
+++ b/target/meson.build
@@ -5,6 +5,7 @@  subdir('cris')
 subdir('hexagon')
 subdir('hppa')
 subdir('i386')
+subdir('loongarch')
 subdir('m68k')
 subdir('microblaze')
 subdir('mips')