lock user-mode and semantic-bugs

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+
+
+Please refactor linux-user/mips/cpu_loop.c
+
+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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