Revert 23028 - "MIPS: Add support for arch. revision 6 to mips32 port."

src/base/atomicops_internals_mips_gcc.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file is an internal atomic implementation, use atomicops.h instead.
 
 #ifndef V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
 #define V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_
 
 namespace v8 {
 namespace base {
 
 // Atomically execute:
 //      result = *ptr;
 //      if (*ptr == old_value)
 //        *ptr = new_value;
 //      return result;
 //
 // I.e., replace "*ptr" with "new_value" if "*ptr" used to be "old_value".
 // Always return the old value of "*ptr"
 //
 // This routine implies no memory barriers.
 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                                          Atomic32 old_value,
                                          Atomic32 new_value) {
   Atomic32 prev, tmp;
   __asm__ __volatile__(".set push\n"
                        ".set noreorder\n"
                        "1:\n"
-                       "ll %0, 0(%4)\n"  // prev = *ptr
-                       "bne %0, %2, 2f\n"  // if (prev != old_value) goto 2
-                       "move %1, %3\n"  // tmp = new_value
-                       "sc %1, 0(%4)\n"  // *ptr = tmp (with atomic check)
-                       "beqz %1, 1b\n"  // start again on atomic error
+                       "ll %0, %5\n"  // prev = *ptr
+                       "bne %0, %3, 2f\n"  // if (prev != old_value) goto 2
+                       "move %2, %4\n"  // tmp = new_value
+                       "sc %2, %1\n"  // *ptr = tmp (with atomic check)
+                       "beqz %2, 1b\n"  // start again on atomic error
                        "nop\n"  // delay slot nop
                        "2:\n"
                        ".set pop\n"
-                       : "=&r" (prev), "=&r" (tmp)
-                       : "Ir" (old_value), "r" (new_value), "r" (ptr)
+                       : "=&r" (prev), "=m" (*ptr), "=&r" (tmp)
+                       : "Ir" (old_value), "r" (new_value), "m" (*ptr)
                        : "memory");
   return prev;
 }
 
 // Atomically store new_value into *ptr, returning the previous value held in
 // *ptr.  This routine implies no memory barriers.
 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
                                          Atomic32 new_value) {
   Atomic32 temp, old;
   __asm__ __volatile__(".set push\n"
                        ".set noreorder\n"
-                       ".set at\n"
                        "1:\n"
-                       "ll %1, 0(%3)\n"  // old = *ptr
-                       "move %0, %2\n"  // temp = new_value
-                       "sc %0, 0(%3)\n"  // *ptr = temp (with atomic check)
+                       "ll %1, %2\n"  // old = *ptr
+                       "move %0, %3\n"  // temp = new_value
+                       "sc %0, %2\n"  // *ptr = temp (with atomic check)
                        "beqz %0, 1b\n"  // start again on atomic error
                        "nop\n"  // delay slot nop
                        ".set pop\n"
-                       : "=&r" (temp), "=&r" (old)
-                       : "r" (new_value), "r" (ptr)
+                       : "=&r" (temp), "=&r" (old), "=m" (*ptr)
+                       : "r" (new_value), "m" (*ptr)
                        : "memory");
 
   return old;
 }
 
 // Atomically increment *ptr by "increment".  Returns the new value of
 // *ptr with the increment applied.  This routine implies no memory barriers.
 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   Atomic32 temp, temp2;
 
   __asm__ __volatile__(".set push\n"
                        ".set noreorder\n"
                        "1:\n"
-                       "ll %0, 0(%3)\n"  // temp = *ptr
-                       "addu %1, %0, %2\n"  // temp2 = temp + increment
-                       "sc %1, 0(%3)\n"  // *ptr = temp2 (with atomic check)
+                       "ll %0, %2\n"  // temp = *ptr
+                       "addu %1, %0, %3\n"  // temp2 = temp + increment
+                       "sc %1, %2\n"  // *ptr = temp2 (with atomic check)
                        "beqz %1, 1b\n"  // start again on atomic error
-                       "addu %1, %0, %2\n"  // temp2 = temp + increment
+                       "addu %1, %0, %3\n"  // temp2 = temp + increment
                        ".set pop\n"
-                       : "=&r" (temp), "=&r" (temp2)
-                       : "Ir" (increment), "r" (ptr)
+                       : "=&r" (temp), "=&r" (temp2), "=m" (*ptr)
+                       : "Ir" (increment), "m" (*ptr)
                        : "memory");
   // temp2 now holds the final value.
   return temp2;
 }
 
 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
                                         Atomic32 increment) {
   MemoryBarrier();
   Atomic32 res = NoBarrier_AtomicIncrement(ptr, increment);
   MemoryBarrier();
@@ skipping 58 matching lines @@
 }
 
 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   MemoryBarrier();
   return *ptr;
 }
 
 } }  // namespace v8::base
 
 #endif  // V8_BASE_ATOMICOPS_INTERNALS_MIPS_GCC_H_