[Bug 1858461] Re: Please refactor linux-user/mips/cpu_loop.c

[Aleksandar Markovic <1858461@bugs.launchpad.net>]

Also, can you please add more info on "emerge" problem, so that I can
repro it with the current QEMU. I would prefer to know the roots cause,
rather than just accept that the problem disappeared.

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https://bugs.launchpad.net/bugs/1858461

Title:
  Please refactor linux-user/mips/cpu_loop.c

Status in QEMU:
  New

Bug description:
  Hello. I am working with qemu on test images. I've added a new syscall
  (436) to qemu but received ENOSYS from mips application.

  Please open "linux-user/mips/cpu_loop.c". I've added at the end of
  "mips_syscall_args" the following:

  ```
  MIPS_SYS(sys_getdents64_x32, 3)
  ```

  But

  ```
  syscall_num = env->active_tc.gpr[2] - 4000;
  if (syscall_num >= sizeof(mips_syscall_args)) {
    ret = -TARGET_ENOSYS;
  ```

  returns -TARGET_ENOSYS

  We can see that "linux-user/mips/cpu_loop.c" differs a lot from
  "linux-user/arm/cpu_loop.c". Arm has it's own "ARM_NR_BASE" and etc.

  Can you please refactor mips cpu loop in the same way as arm? Thank
  you.

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