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Thomas Huth 0c8e6ac989 target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts 
The test in tests/avocado/machine_loongarch.py is currently failing
on big endian hosts like s390x. By comparing the traces between running
the QEMU_EFI.fd bios on a s390x and on a x86 host, it's quickly obvious
that the CSRRD instruction for the CPUID is behaving differently. And
indeed: The code currently does a long read (i.e. 64 bit) from the
address that points to the CPUState->cpu_index field (with tcg_gen_ld_tl()
in the trans_csrrd() function). But this cpu_index field is only an "int"
(i.e. 32 bit). While this dirty pointer magic works on little endian hosts,
it of course fails on big endian hosts. Fix it by using a proper helper
function instead.

Message-Id: <20230720175307.854460-1-thuth@redhat.com>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit c34ad459926f6c600a55fe6782a27edfa405d60b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2023-07-31 09:12:06 +03:00
..
insn_trans
target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts
2023-07-31 09:12:06 +03:00
constant_timer.c
…
cpu-csr.h
…
cpu-param.h
…
cpu.c
…
cpu.h
target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts
2023-07-31 09:12:06 +03:00
csr_helper.c
target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts
2023-07-31 09:12:06 +03:00
disas.c
…
fpu_helper.c
…
gdbstub.c
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helper.h
target/loongarch: Fix the CSRRD CPUID instruction on big endian hosts
2023-07-31 09:12:06 +03:00
insns.decode
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internals.h
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iocsr_helper.c
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Kconfig
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machine.c
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meson.build
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op_helper.c
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README
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tlb_helper.c
target/loongarch: Separate the hardware flags into MMU index and PLV
2022-11-07 10:54:08 +08:00
translate.c
target/loongarch: Separate the hardware flags into MMU index and PLV
2022-11-07 10:54:08 +08:00
translate.h
target/loongarch: Separate the hardware flags into MMU index and PLV
2022-11-07 10:54:08 +08:00

README 

- Introduction

  LoongArch is the general processor architecture of Loongson.

  The following versions of the LoongArch core are supported
    core: 3A5000
    https://github.com/loongson/LoongArch-Documentation/releases/download/2021.08.17/LoongArch-Vol1-v1.00-EN.pdf

  We can get the latest loongarch documents at https://github.com/loongson/LoongArch-Documentation/tags.


- System emulation

  You can reference docs/system/loongarch/loongson3.rst to get the information about system emulation of LoongArch.

- Linux-user emulation

  We already support Linux user emulation. We can use LoongArch cross-tools to build LoongArch executables on X86 machines,
  and We can also use qemu-loongarch64 to run LoongArch executables.

  1. Config cross-tools env.

     see System emulation.

  2. Test tests/tcg/multiarch.

     ./configure  --static  --prefix=/usr  --disable-werror --target-list="loongarch64-linux-user" --enable-debug

     cd build

     make && make check-tcg

  3. Run LoongArch system basic command with loongarch-clfs-system.

     - Config clfs env.

       wget https://github.com/loongson/build-tools/releases/download/2022.05.29/loongarch64-clfs-system-5.0.tar.bz2

       tar -vxf loongarch64-clfs-system-5.0.tar.bz2 -C /opt/clfs

       cp /opt/clfs/lib64/ld-linux-loongarch-lp64d.so.1  /lib64

       export LD_LIBRARY_PATH="/opt/clfs/lib64"

     - Run LoongArch system basic command.

       ./qemu-loongarch64  /opt/clfs/usr/bin/bash
       ./qemu-loongarch64  /opt/clfs/usr/bin/ls
       ./qemu-loongarch64  /opt/clfs/usr/bin/pwd

- Note.
  We can get the latest LoongArch documents or LoongArch tools at https://github.com/loongson/