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/* libs/pixelflinger/codeflinger/ARMAssemblerInterface.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <cutils/log.h>
#include "codeflinger/ARMAssemblerInterface.h"
namespace android {
// ----------------------------------------------------------------------------
ARMAssemblerInterface::~ARMAssemblerInterface()
{
}
int ARMAssemblerInterface::buildImmediate(
uint32_t immediate, uint32_t& rot, uint32_t& imm)
{
rot = 0;
imm = immediate;
if (imm > 0x7F) { // skip the easy cases
while (!(imm&3) || (imm&0xFC000000)) {
uint32_t newval;
newval = imm >> 2;
newval |= (imm&3) << 30;
imm = newval;
rot += 2;
if (rot == 32) {
rot = 0;
break;
}
}
}
rot = (16 - (rot>>1)) & 0xF;
if (imm>=0x100)
return -EINVAL;
if (((imm>>(rot<<1)) | (imm<<(32-(rot<<1)))) != immediate)
return -1;
return 0;
}
// shifters...
bool ARMAssemblerInterface::isValidImmediate(uint32_t immediate)
{
uint32_t rot, imm;
return buildImmediate(immediate, rot, imm) == 0;
}
uint32_t ARMAssemblerInterface::imm(uint32_t immediate)
{
uint32_t rot, imm;
int err = buildImmediate(immediate, rot, imm);
LOG_ALWAYS_FATAL_IF(err==-EINVAL,
"immediate %08x cannot be encoded",
immediate);
LOG_ALWAYS_FATAL_IF(err,
"immediate (%08x) encoding bogus!",
immediate);
return (1<<25) | (rot<<8) | imm;
}
uint32_t ARMAssemblerInterface::reg_imm(int Rm, int type, uint32_t shift)
{
return ((shift&0x1F)<<7) | ((type&0x3)<<5) | (Rm&0xF);
}
uint32_t ARMAssemblerInterface::reg_rrx(int Rm)
{
return (ROR<<5) | (Rm&0xF);
}
uint32_t ARMAssemblerInterface::reg_reg(int Rm, int type, int Rs)
{
return ((Rs&0xF)<<8) | ((type&0x3)<<5) | (1<<4) | (Rm&0xF);
}
// addressing modes...
// LDR(B)/STR(B)/PLD (immediate and Rm can be negative, which indicate U=0)
uint32_t ARMAssemblerInterface::immed12_pre(int32_t immed12, int W)
{
LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
"LDR(B)/STR(B)/PLD immediate too big (%08x)",
immed12);
return (1<<24) | (((uint32_t(immed12)>>31)^1)<<23) |
((W&1)<<21) | (abs(immed12)&0x7FF);
}
uint32_t ARMAssemblerInterface::immed12_post(int32_t immed12)
{
LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
"LDR(B)/STR(B)/PLD immediate too big (%08x)",
immed12);
return (((uint32_t(immed12)>>31)^1)<<23) | (abs(immed12)&0x7FF);
}
uint32_t ARMAssemblerInterface::reg_scale_pre(int Rm, int type,
uint32_t shift, int W)
{
return (1<<25) | (1<<24) |
(((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) |
reg_imm(abs(Rm), type, shift);
}
uint32_t ARMAssemblerInterface::reg_scale_post(int Rm, int type, uint32_t shift)
{
return (1<<25) | (((uint32_t(Rm)>>31)^1)<<23) | reg_imm(abs(Rm), type, shift);
}
// LDRH/LDRSB/LDRSH/STRH (immediate and Rm can be negative, which indicate U=0)
uint32_t ARMAssemblerInterface::immed8_pre(int32_t immed8, int W)
{
uint32_t offset = abs(immed8);
LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
"LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
immed8);
return (1<<24) | (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
((W&1)<<21) | (((offset&0xF0)<<4)|(offset&0xF));
}
uint32_t ARMAssemblerInterface::immed8_post(int32_t immed8)
{
uint32_t offset = abs(immed8);
LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
"LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
immed8);
return (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
(((offset&0xF0)<<4) | (offset&0xF));
}
uint32_t ARMAssemblerInterface::reg_pre(int Rm, int W)
{
return (1<<24) | (((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) | (abs(Rm)&0xF);
}
uint32_t ARMAssemblerInterface::reg_post(int Rm)
{
return (((uint32_t(Rm)>>31)^1)<<23) | (abs(Rm)&0xF);
}
}; // namespace android
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