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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 #define LOG_TAG "pixelflinger-code"
     18 
     19 #include <errno.h>
     20 #include <stdint.h>
     21 #include <stdlib.h>
     22 #include <sys/types.h>
     23 
     24 #include <log/log.h>
     25 
     26 #include "ARMAssemblerInterface.h"
     27 
     28 namespace android {
     29 
     30 // ----------------------------------------------------------------------------
     31 
     32 ARMAssemblerInterface::~ARMAssemblerInterface()
     33 {
     34 }
     35 
     36 // --------------------------------------------------------------------
     37 
     38 // The following two functions are static and used for initializers
     39 // in the original ARM code. The above versions (without __), are now
     40 // virtual, and can be overridden in the MIPS code. But since these are
     41 // needed at initialization time, they must be static. Not thrilled with
     42 // this implementation, but it works...
     43 
     44 uint32_t ARMAssemblerInterface::__immed12_pre(int32_t immed12, int W)
     45 {
     46     LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
     47                         "LDR(B)/STR(B)/PLD immediate too big (%08x)",
     48                         immed12);
     49     return (1<<24) | (((uint32_t(immed12)>>31)^1)<<23) |
     50             ((W&1)<<21) | (abs(immed12)&0x7FF);
     51 }
     52 
     53 uint32_t ARMAssemblerInterface::__immed8_pre(int32_t immed8, int W)
     54 {
     55     uint32_t offset = abs(immed8);
     56 
     57     LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
     58                         "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
     59                         immed8);
     60 
     61     return  (1<<24) | (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
     62             ((W&1)<<21) | (((offset&0xF0)<<4)|(offset&0xF));
     63 }
     64 
     65 // The following four functions are required for address manipulation
     66 // These are virtual functions, which can be overridden by architectures
     67 // that need special handling of address values (e.g. 64-bit arch)
     68 
     69 void ARMAssemblerInterface::ADDR_LDR(int cc, int Rd,
     70      int Rn, uint32_t offset)
     71 {
     72     LDR(cc, Rd, Rn, offset);
     73 }
     74 void ARMAssemblerInterface::ADDR_STR(int cc, int Rd,
     75      int Rn, uint32_t offset)
     76 {
     77     STR(cc, Rd, Rn, offset);
     78 }
     79 void ARMAssemblerInterface::ADDR_ADD(int cc, int s,
     80      int Rd, int Rn, uint32_t Op2)
     81 {
     82     dataProcessing(opADD, cc, s, Rd, Rn, Op2);
     83 }
     84 void ARMAssemblerInterface::ADDR_SUB(int cc, int s,
     85      int Rd, int Rn, uint32_t Op2)
     86 {
     87     dataProcessing(opSUB, cc, s, Rd, Rn, Op2);
     88 }
     89 }; // namespace android
     90 
     91