1 /*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without modification, are
7 * permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this list of
10 * conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
13 * of conditions and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 /* ppc 32-bit arch dependent functions. */
28
load_immediate(struct sljit_compiler * compiler,sljit_s32 reg,sljit_sw imm)29 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw imm)
30 {
31 if (imm <= SIMM_MAX && imm >= SIMM_MIN)
32 return push_inst(compiler, ADDI | D(reg) | A(0) | IMM(imm));
33
34 if (!(imm & ~0xffff))
35 return push_inst(compiler, ORI | S(TMP_ZERO) | A(reg) | IMM(imm));
36
37 FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(imm >> 16)));
38 return (imm & 0xffff) ? push_inst(compiler, ORI | S(reg) | A(reg) | IMM(imm)) : SLJIT_SUCCESS;
39 }
40
41 /* Simplified mnemonics: clrlwi. */
42 #define INS_CLEAR_LEFT(dst, src, from) \
43 (RLWINM | S(src) | A(dst) | RLWI_MBE(from, 31))
44
emit_single_op(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 flags,sljit_s32 dst,sljit_s32 src1,sljit_s32 src2)45 static SLJIT_INLINE sljit_s32 emit_single_op(struct sljit_compiler *compiler, sljit_s32 op, sljit_s32 flags,
46 sljit_s32 dst, sljit_s32 src1, sljit_s32 src2)
47 {
48 sljit_u32 imm;
49
50 switch (op) {
51 case SLJIT_MOV:
52 case SLJIT_MOV_U32:
53 case SLJIT_MOV_S32:
54 case SLJIT_MOV_P:
55 SLJIT_ASSERT(src1 == TMP_REG1);
56 if (dst != src2)
57 return push_inst(compiler, OR | S(src2) | A(dst) | B(src2));
58 return SLJIT_SUCCESS;
59
60 case SLJIT_MOV_U8:
61 case SLJIT_MOV_S8:
62 SLJIT_ASSERT(src1 == TMP_REG1);
63 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
64 if (op == SLJIT_MOV_S8)
65 return push_inst(compiler, EXTSB | S(src2) | A(dst));
66 return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 24));
67 }
68 else if ((flags & REG_DEST) && op == SLJIT_MOV_S8)
69 return push_inst(compiler, EXTSB | S(src2) | A(dst));
70 else {
71 SLJIT_ASSERT(dst == src2);
72 }
73 return SLJIT_SUCCESS;
74
75 case SLJIT_MOV_U16:
76 case SLJIT_MOV_S16:
77 SLJIT_ASSERT(src1 == TMP_REG1);
78 if ((flags & (REG_DEST | REG2_SOURCE)) == (REG_DEST | REG2_SOURCE)) {
79 if (op == SLJIT_MOV_S16)
80 return push_inst(compiler, EXTSH | S(src2) | A(dst));
81 return push_inst(compiler, INS_CLEAR_LEFT(dst, src2, 16));
82 }
83 else {
84 SLJIT_ASSERT(dst == src2);
85 }
86 return SLJIT_SUCCESS;
87
88 case SLJIT_NOT:
89 SLJIT_ASSERT(src1 == TMP_REG1);
90 return push_inst(compiler, NOR | RC(flags) | S(src2) | A(dst) | B(src2));
91
92 case SLJIT_CLZ:
93 SLJIT_ASSERT(src1 == TMP_REG1);
94 return push_inst(compiler, CNTLZW | S(src2) | A(dst));
95
96 case SLJIT_CTZ:
97 SLJIT_ASSERT(src1 == TMP_REG1);
98 FAIL_IF(push_inst(compiler, NEG | D(TMP_REG1) | A(src2)));
99 FAIL_IF(push_inst(compiler, AND | S(src2) | A(dst) | B(TMP_REG1)));
100 FAIL_IF(push_inst(compiler, CNTLZW | S(dst) | A(dst)));
101 FAIL_IF(push_inst(compiler, ADDI | D(TMP_REG1) | A(dst) | IMM(-32)));
102 /* The highest bits are set, if dst < 32, zero otherwise. */
103 FAIL_IF(push_inst(compiler, SRWI(27) | S(TMP_REG1) | A(TMP_REG1)));
104 return push_inst(compiler, XOR | S(dst) | A(dst) | B(TMP_REG1));
105
106 case SLJIT_ADD:
107 if (flags & ALT_FORM1) {
108 /* Setting XER SO is not enough, CR SO is also needed. */
109 return push_inst(compiler, ADD | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
110 }
111
112 if (flags & ALT_FORM2) {
113 /* Flags does not set: BIN_IMM_EXTS unnecessary. */
114 SLJIT_ASSERT(src2 == TMP_REG2);
115
116 if (flags & ALT_FORM3)
117 return push_inst(compiler, ADDIS | D(dst) | A(src1) | compiler->imm);
118
119 imm = compiler->imm;
120
121 if (flags & ALT_FORM4) {
122 FAIL_IF(push_inst(compiler, ADDIS | D(dst) | A(src1) | (((imm >> 16) & 0xffff) + ((imm >> 15) & 0x1))));
123 src1 = dst;
124 }
125
126 return push_inst(compiler, ADDI | D(dst) | A(src1) | (imm & 0xffff));
127 }
128 if (flags & ALT_FORM3) {
129 SLJIT_ASSERT(src2 == TMP_REG2);
130 return push_inst(compiler, ADDIC | D(dst) | A(src1) | compiler->imm);
131 }
132 SLJIT_ASSERT(!(flags & ALT_FORM4));
133 if (!(flags & ALT_SET_FLAGS))
134 return push_inst(compiler, ADD | D(dst) | A(src1) | B(src2));
135 if (flags & ALT_FORM5)
136 return push_inst(compiler, ADDC | RC(ALT_SET_FLAGS) | D(dst) | A(src1) | B(src2));
137 return push_inst(compiler, ADD | RC(flags) | D(dst) | A(src1) | B(src2));
138
139 case SLJIT_ADDC:
140 return push_inst(compiler, ADDE | D(dst) | A(src1) | B(src2));
141
142 case SLJIT_SUB:
143 if (flags & ALT_FORM1) {
144 if (flags & ALT_FORM2) {
145 FAIL_IF(push_inst(compiler, CMPLI | CRD(0) | A(src1) | compiler->imm));
146 if (!(flags & ALT_FORM3))
147 return SLJIT_SUCCESS;
148 return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
149 }
150 FAIL_IF(push_inst(compiler, CMPL | CRD(0) | A(src1) | B(src2)));
151 if (!(flags & ALT_FORM3))
152 return SLJIT_SUCCESS;
153 return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
154 }
155
156 if (flags & ALT_FORM2) {
157 if (flags & ALT_FORM3) {
158 FAIL_IF(push_inst(compiler, CMPI | CRD(0) | A(src1) | compiler->imm));
159 if (!(flags & ALT_FORM4))
160 return SLJIT_SUCCESS;
161 return push_inst(compiler, ADDI | D(dst) | A(src1) | (-compiler->imm & 0xffff));
162 }
163 FAIL_IF(push_inst(compiler, CMP | CRD(0) | A(src1) | B(src2)));
164 if (!(flags & ALT_FORM4))
165 return SLJIT_SUCCESS;
166 return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
167 }
168
169 if (flags & ALT_FORM3) {
170 /* Setting XER SO is not enough, CR SO is also needed. */
171 if (src1 != TMP_ZERO)
172 return push_inst(compiler, SUBF | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
173 return push_inst(compiler, NEG | OE(ALT_SET_FLAGS) | RC(ALT_SET_FLAGS) | D(dst) | A(src2));
174 }
175
176 if (flags & ALT_FORM4) {
177 /* Flags does not set: BIN_IMM_EXTS unnecessary. */
178 SLJIT_ASSERT(src2 == TMP_REG2);
179 return push_inst(compiler, SUBFIC | D(dst) | A(src1) | compiler->imm);
180 }
181
182 if (!(flags & ALT_SET_FLAGS)) {
183 SLJIT_ASSERT(src1 != TMP_ZERO);
184 return push_inst(compiler, SUBF | D(dst) | A(src2) | B(src1));
185 }
186
187 if (flags & ALT_FORM5)
188 return push_inst(compiler, SUBFC | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
189
190 if (src1 != TMP_ZERO)
191 return push_inst(compiler, SUBF | RC(ALT_SET_FLAGS) | D(dst) | A(src2) | B(src1));
192 return push_inst(compiler, NEG | RC(ALT_SET_FLAGS) | D(dst) | A(src2));
193
194 case SLJIT_SUBC:
195 return push_inst(compiler, SUBFE | D(dst) | A(src2) | B(src1));
196
197 case SLJIT_MUL:
198 if (flags & ALT_FORM1) {
199 SLJIT_ASSERT(src2 == TMP_REG2);
200 return push_inst(compiler, MULLI | D(dst) | A(src1) | compiler->imm);
201 }
202 return push_inst(compiler, MULLW | OE(flags) | RC(flags) | D(dst) | A(src2) | B(src1));
203
204 case SLJIT_AND:
205 if (flags & ALT_FORM1) {
206 SLJIT_ASSERT(src2 == TMP_REG2);
207 return push_inst(compiler, ANDI | S(src1) | A(dst) | compiler->imm);
208 }
209 if (flags & ALT_FORM2) {
210 SLJIT_ASSERT(src2 == TMP_REG2);
211 return push_inst(compiler, ANDIS | S(src1) | A(dst) | compiler->imm);
212 }
213 return push_inst(compiler, AND | RC(flags) | S(src1) | A(dst) | B(src2));
214
215 case SLJIT_OR:
216 if (flags & ALT_FORM1) {
217 SLJIT_ASSERT(src2 == TMP_REG2);
218 return push_inst(compiler, ORI | S(src1) | A(dst) | compiler->imm);
219 }
220 if (flags & ALT_FORM2) {
221 SLJIT_ASSERT(src2 == TMP_REG2);
222 return push_inst(compiler, ORIS | S(src1) | A(dst) | compiler->imm);
223 }
224 if (flags & ALT_FORM3) {
225 SLJIT_ASSERT(src2 == TMP_REG2);
226 imm = compiler->imm;
227
228 FAIL_IF(push_inst(compiler, ORI | S(src1) | A(dst) | IMM(imm)));
229 return push_inst(compiler, ORIS | S(dst) | A(dst) | IMM(imm >> 16));
230 }
231 return push_inst(compiler, OR | RC(flags) | S(src1) | A(dst) | B(src2));
232
233 case SLJIT_XOR:
234 if (flags & ALT_FORM1) {
235 SLJIT_ASSERT(src2 == TMP_REG2);
236 return push_inst(compiler, XORI | S(src1) | A(dst) | compiler->imm);
237 }
238 if (flags & ALT_FORM2) {
239 SLJIT_ASSERT(src2 == TMP_REG2);
240 return push_inst(compiler, XORIS | S(src1) | A(dst) | compiler->imm);
241 }
242 if (flags & ALT_FORM3) {
243 SLJIT_ASSERT(src2 == TMP_REG2);
244 imm = compiler->imm;
245
246 FAIL_IF(push_inst(compiler, XORI | S(src1) | A(dst) | IMM(imm)));
247 return push_inst(compiler, XORIS | S(dst) | A(dst) | IMM(imm >> 16));
248 }
249 return push_inst(compiler, XOR | RC(flags) | S(src1) | A(dst) | B(src2));
250
251 case SLJIT_SHL:
252 case SLJIT_MSHL:
253 if (flags & ALT_FORM1) {
254 SLJIT_ASSERT(src2 == TMP_REG2);
255 imm = compiler->imm & 0x1f;
256 return push_inst(compiler, SLWI(imm) | RC(flags) | S(src1) | A(dst));
257 }
258
259 if (op == SLJIT_MSHL) {
260 FAIL_IF(push_inst(compiler, ANDI | S(src2) | A(TMP_REG2) | 0x1f));
261 src2 = TMP_REG2;
262 }
263
264 return push_inst(compiler, SLW | RC(flags) | S(src1) | A(dst) | B(src2));
265
266 case SLJIT_LSHR:
267 case SLJIT_MLSHR:
268 if (flags & ALT_FORM1) {
269 SLJIT_ASSERT(src2 == TMP_REG2);
270 imm = compiler->imm & 0x1f;
271 /* Since imm can be 0, SRWI() cannot be used. */
272 return push_inst(compiler, RLWINM | RC(flags) | S(src1) | A(dst) | RLWI_SH((32 - imm) & 0x1f) | RLWI_MBE(imm, 31));
273 }
274
275 if (op == SLJIT_MLSHR) {
276 FAIL_IF(push_inst(compiler, ANDI | S(src2) | A(TMP_REG2) | 0x1f));
277 src2 = TMP_REG2;
278 }
279
280 return push_inst(compiler, SRW | RC(flags) | S(src1) | A(dst) | B(src2));
281
282 case SLJIT_ASHR:
283 case SLJIT_MASHR:
284 if (flags & ALT_FORM1) {
285 SLJIT_ASSERT(src2 == TMP_REG2);
286 imm = compiler->imm & 0x1f;
287 return push_inst(compiler, SRAWI | RC(flags) | S(src1) | A(dst) | (imm << 11));
288 }
289
290 if (op == SLJIT_MASHR) {
291 FAIL_IF(push_inst(compiler, ANDI | S(src2) | A(TMP_REG2) | 0x1f));
292 src2 = TMP_REG2;
293 }
294
295 return push_inst(compiler, SRAW | RC(flags) | S(src1) | A(dst) | B(src2));
296
297 case SLJIT_ROTL:
298 case SLJIT_ROTR:
299 if (flags & ALT_FORM1) {
300 SLJIT_ASSERT(src2 == TMP_REG2);
301 imm = compiler->imm;
302
303 if (op == SLJIT_ROTR)
304 imm = (sljit_u32)(-(sljit_s32)imm);
305
306 imm &= 0x1f;
307 return push_inst(compiler, RLWINM | S(src1) | A(dst) | RLWI_SH(imm) | RLWI_MBE(0, 31));
308 }
309
310 if (op == SLJIT_ROTR) {
311 FAIL_IF(push_inst(compiler, SUBFIC | D(TMP_REG2) | A(src2) | 0));
312 src2 = TMP_REG2;
313 }
314
315 return push_inst(compiler, RLWNM | S(src1) | A(dst) | B(src2) | RLWI_MBE(0, 31));
316 }
317
318 SLJIT_UNREACHABLE();
319 return SLJIT_SUCCESS;
320 }
321
emit_const(struct sljit_compiler * compiler,sljit_s32 reg,sljit_sw init_value)322 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 reg, sljit_sw init_value)
323 {
324 FAIL_IF(push_inst(compiler, ADDIS | D(reg) | A(0) | IMM(init_value >> 16)));
325 return push_inst(compiler, ORI | S(reg) | A(reg) | IMM(init_value));
326 }
327
sljit_set_jump_addr(sljit_uw addr,sljit_uw new_target,sljit_sw executable_offset)328 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
329 {
330 sljit_ins *inst = (sljit_ins *)addr;
331 SLJIT_UNUSED_ARG(executable_offset);
332
333 SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 0);
334 SLJIT_ASSERT((inst[0] & 0xfc1f0000) == ADDIS && (inst[1] & 0xfc000000) == ORI);
335 inst[0] = (inst[0] & 0xffff0000) | ((new_target >> 16) & 0xffff);
336 inst[1] = (inst[1] & 0xffff0000) | (new_target & 0xffff);
337 SLJIT_UPDATE_WX_FLAGS(inst, inst + 2, 1);
338 inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
339 SLJIT_CACHE_FLUSH(inst, inst + 2);
340 }
341