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      1 /* libs/pixelflinger/codeflinger/ARMAssemblerInterface.cpp
      2 **
      3 ** Copyright 2006, The Android Open Source Project
      4 **
      5 ** Licensed under the Apache License, Version 2.0 (the "License");
      6 ** you may not use this file except in compliance with the License.
      7 ** You may obtain a copy of the License at
      8 **
      9 **     http://www.apache.org/licenses/LICENSE-2.0
     10 **
     11 ** Unless required by applicable law or agreed to in writing, software
     12 ** distributed under the License is distributed on an "AS IS" BASIS,
     13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14 ** See the License for the specific language governing permissions and
     15 ** limitations under the License.
     16 */
     17 
     18 
     19 #include <errno.h>
     20 #include <stdlib.h>
     21 #include <stdint.h>
     22 #include <sys/types.h>
     23 
     24 #include <cutils/log.h>
     25 #include "ARMAssemblerInterface.h"
     26 
     27 namespace android {
     28 
     29 // ----------------------------------------------------------------------------
     30 
     31 ARMAssemblerInterface::~ARMAssemblerInterface()
     32 {
     33 }
     34 
     35 // --------------------------------------------------------------------
     36 
     37 // The following two functions are static and used for initializers
     38 // in the original ARM code. The above versions (without __), are now
     39 // virtual, and can be overridden in the MIPS code. But since these are
     40 // needed at initialization time, they must be static. Not thrilled with
     41 // this implementation, but it works...
     42 
     43 uint32_t ARMAssemblerInterface::__immed12_pre(int32_t immed12, int W)
     44 {
     45     LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
     46                         "LDR(B)/STR(B)/PLD immediate too big (%08x)",
     47                         immed12);
     48     return (1<<24) | (((uint32_t(immed12)>>31)^1)<<23) |
     49             ((W&1)<<21) | (abs(immed12)&0x7FF);
     50 }
     51 
     52 uint32_t ARMAssemblerInterface::__immed8_pre(int32_t immed8, int W)
     53 {
     54     uint32_t offset = abs(immed8);
     55 
     56     LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
     57                         "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
     58                         immed8);
     59 
     60     return  (1<<24) | (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
     61             ((W&1)<<21) | (((offset&0xF0)<<4)|(offset&0xF));
     62 }
     63 
     64 
     65 }; // namespace android
     66 
     67