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The Android Open Source Projectdd7bc332009-03-03 19:32:55 -08001/* 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 "codeflinger/ARMAssemblerInterface.h"
26
27namespace android {
28
29// ----------------------------------------------------------------------------
30
31ARMAssemblerInterface::~ARMAssemblerInterface()
32{
33}
34
35int ARMAssemblerInterface::buildImmediate(
36 uint32_t immediate, uint32_t& rot, uint32_t& imm)
37{
38 rot = 0;
39 imm = immediate;
40 if (imm > 0x7F) { // skip the easy cases
41 while (!(imm&3) || (imm&0xFC000000)) {
42 uint32_t newval;
43 newval = imm >> 2;
44 newval |= (imm&3) << 30;
45 imm = newval;
46 rot += 2;
47 if (rot == 32) {
48 rot = 0;
49 break;
50 }
51 }
52 }
53 rot = (16 - (rot>>1)) & 0xF;
54
55 if (imm>=0x100)
56 return -EINVAL;
57
58 if (((imm>>(rot<<1)) | (imm<<(32-(rot<<1)))) != immediate)
59 return -1;
60
61 return 0;
62}
63
64// shifters...
65
66bool ARMAssemblerInterface::isValidImmediate(uint32_t immediate)
67{
68 uint32_t rot, imm;
69 return buildImmediate(immediate, rot, imm) == 0;
70}
71
72uint32_t ARMAssemblerInterface::imm(uint32_t immediate)
73{
74 uint32_t rot, imm;
75 int err = buildImmediate(immediate, rot, imm);
76
77 LOG_ALWAYS_FATAL_IF(err==-EINVAL,
78 "immediate %08x cannot be encoded",
79 immediate);
80
81 LOG_ALWAYS_FATAL_IF(err,
82 "immediate (%08x) encoding bogus!",
83 immediate);
84
85 return (1<<25) | (rot<<8) | imm;
86}
87
88uint32_t ARMAssemblerInterface::reg_imm(int Rm, int type, uint32_t shift)
89{
90 return ((shift&0x1F)<<7) | ((type&0x3)<<5) | (Rm&0xF);
91}
92
93uint32_t ARMAssemblerInterface::reg_rrx(int Rm)
94{
95 return (ROR<<5) | (Rm&0xF);
96}
97
98uint32_t ARMAssemblerInterface::reg_reg(int Rm, int type, int Rs)
99{
100 return ((Rs&0xF)<<8) | ((type&0x3)<<5) | (1<<4) | (Rm&0xF);
101}
102
103// addressing modes...
104// LDR(B)/STR(B)/PLD (immediate and Rm can be negative, which indicate U=0)
105uint32_t ARMAssemblerInterface::immed12_pre(int32_t immed12, int W)
106{
107 LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
108 "LDR(B)/STR(B)/PLD immediate too big (%08x)",
109 immed12);
110 return (1<<24) | (((uint32_t(immed12)>>31)^1)<<23) |
111 ((W&1)<<21) | (abs(immed12)&0x7FF);
112}
113
114uint32_t ARMAssemblerInterface::immed12_post(int32_t immed12)
115{
116 LOG_ALWAYS_FATAL_IF(abs(immed12) >= 0x800,
117 "LDR(B)/STR(B)/PLD immediate too big (%08x)",
118 immed12);
119
120 return (((uint32_t(immed12)>>31)^1)<<23) | (abs(immed12)&0x7FF);
121}
122
123uint32_t ARMAssemblerInterface::reg_scale_pre(int Rm, int type,
124 uint32_t shift, int W)
125{
126 return (1<<25) | (1<<24) |
127 (((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) |
128 reg_imm(abs(Rm), type, shift);
129}
130
131uint32_t ARMAssemblerInterface::reg_scale_post(int Rm, int type, uint32_t shift)
132{
133 return (1<<25) | (((uint32_t(Rm)>>31)^1)<<23) | reg_imm(abs(Rm), type, shift);
134}
135
136// LDRH/LDRSB/LDRSH/STRH (immediate and Rm can be negative, which indicate U=0)
137uint32_t ARMAssemblerInterface::immed8_pre(int32_t immed8, int W)
138{
139 uint32_t offset = abs(immed8);
140
141 LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
142 "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
143 immed8);
144
145 return (1<<24) | (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
146 ((W&1)<<21) | (((offset&0xF0)<<4)|(offset&0xF));
147}
148
149uint32_t ARMAssemblerInterface::immed8_post(int32_t immed8)
150{
151 uint32_t offset = abs(immed8);
152
153 LOG_ALWAYS_FATAL_IF(abs(immed8) >= 0x100,
154 "LDRH/LDRSB/LDRSH/STRH immediate too big (%08x)",
155 immed8);
156
157 return (1<<22) | (((uint32_t(immed8)>>31)^1)<<23) |
158 (((offset&0xF0)<<4) | (offset&0xF));
159}
160
161uint32_t ARMAssemblerInterface::reg_pre(int Rm, int W)
162{
163 return (1<<24) | (((uint32_t(Rm)>>31)^1)<<23) | ((W&1)<<21) | (abs(Rm)&0xF);
164}
165
166uint32_t ARMAssemblerInterface::reg_post(int Rm)
167{
168 return (((uint32_t(Rm)>>31)^1)<<23) | (abs(Rm)&0xF);
169}
170
171
172}; // namespace android
173