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
load_immediate(struct sljit_compiler * compiler,sljit_s32 dst_r,sljit_sw imm,sljit_s32 tmp_r)27 static sljit_s32 load_immediate(struct sljit_compiler *compiler, sljit_s32 dst_r, sljit_sw imm, sljit_s32 tmp_r)
28 {
29 sljit_sw high;
30
31 if (imm <= SIMM_MAX && imm >= SIMM_MIN)
32 return push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm));
33
34 if (imm <= 0x7fffffffl && imm >= S32_MIN) {
35 if (imm > S32_MAX) {
36 SLJIT_ASSERT((imm & 0x800) != 0);
37 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)0x80000000u));
38 return push_inst(compiler, XORI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
39 }
40
41 if ((imm & 0x800) != 0)
42 imm += 0x1000;
43
44 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));
45
46 if ((imm & 0xfff) == 0)
47 return SLJIT_SUCCESS;
48
49 return push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
50 }
51
52 /* Trailing zeroes could be used to produce shifted immediates. */
53
54 if (imm <= 0x7ffffffffffl && imm >= -0x80000000000l) {
55 high = imm >> 12;
56
57 if (imm & 0x800)
58 high = ~high;
59
60 if (high > S32_MAX) {
61 SLJIT_ASSERT((high & 0x800) != 0);
62 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)0x80000000u));
63 FAIL_IF(push_inst(compiler, XORI | RD(dst_r) | RS1(dst_r) | IMM_I(high)));
64 } else {
65 if ((high & 0x800) != 0)
66 high += 0x1000;
67
68 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(high & ~0xfff)));
69
70 if ((high & 0xfff) != 0)
71 FAIL_IF(push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(high)));
72 }
73
74 FAIL_IF(push_inst(compiler, SLLI | RD(dst_r) | RS1(dst_r) | IMM_I(12)));
75
76 if ((imm & 0xfff) != 0)
77 return push_inst(compiler, XORI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
78
79 return SLJIT_SUCCESS;
80 }
81
82 SLJIT_ASSERT(dst_r != tmp_r);
83
84 high = imm >> 32;
85 imm = (sljit_s32)imm;
86
87 if ((imm & 0x80000000l) != 0)
88 high = ~high;
89
90 if (high <= 0x7ffff && high >= -0x80000) {
91 FAIL_IF(push_inst(compiler, LUI | RD(tmp_r) | (sljit_ins)(high << 12)));
92 high = 0x1000;
93 } else {
94 if ((high & 0x800) != 0)
95 high += 0x1000;
96
97 FAIL_IF(push_inst(compiler, LUI | RD(tmp_r) | (sljit_ins)(high & ~0xfff)));
98 high &= 0xfff;
99 }
100
101 if (imm <= SIMM_MAX && imm >= SIMM_MIN) {
102 FAIL_IF(push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm)));
103 imm = 0;
104 } else if (imm > S32_MAX) {
105 SLJIT_ASSERT((imm & 0x800) != 0);
106
107 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)0x80000000u));
108 imm = 0x1000 | (imm & 0xfff);
109 } else {
110 if ((imm & 0x800) != 0)
111 imm += 0x1000;
112
113 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));
114 imm &= 0xfff;
115 }
116
117 if ((high & 0xfff) != 0)
118 FAIL_IF(push_inst(compiler, ADDI | RD(tmp_r) | RS1(tmp_r) | IMM_I(high)));
119
120 if (imm & 0x1000)
121 FAIL_IF(push_inst(compiler, XORI | RD(dst_r) | RS1(dst_r) | IMM_I(imm)));
122 else if (imm != 0)
123 FAIL_IF(push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm)));
124
125 FAIL_IF(push_inst(compiler, SLLI | RD(tmp_r) | RS1(tmp_r) | IMM_I((high & 0x1000) ? 20 : 32)));
126 return push_inst(compiler, XOR | RD(dst_r) | RS1(dst_r) | RS2(tmp_r));
127 }
128
sljit_emit_fset64(struct sljit_compiler * compiler,sljit_s32 freg,sljit_f64 value)129 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fset64(struct sljit_compiler *compiler,
130 sljit_s32 freg, sljit_f64 value)
131 {
132 union {
133 sljit_sw imm;
134 sljit_f64 value;
135 } u;
136
137 CHECK_ERROR();
138 CHECK(check_sljit_emit_fset64(compiler, freg, value));
139
140 u.value = value;
141
142 if (u.imm == 0)
143 return push_inst(compiler, FMV_W_X | (1 << 25) | RS1(TMP_ZERO) | FRD(freg));
144
145 FAIL_IF(load_immediate(compiler, TMP_REG1, u.imm, TMP_REG3));
146 return push_inst(compiler, FMV_W_X | (1 << 25) | RS1(TMP_REG1) | FRD(freg));
147 }
148
sljit_emit_fcopy(struct sljit_compiler * compiler,sljit_s32 op,sljit_s32 freg,sljit_s32 reg)149 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fcopy(struct sljit_compiler *compiler, sljit_s32 op,
150 sljit_s32 freg, sljit_s32 reg)
151 {
152 sljit_ins inst;
153
154 CHECK_ERROR();
155 CHECK(check_sljit_emit_fcopy(compiler, op, freg, reg));
156
157 if (GET_OPCODE(op) == SLJIT_COPY_TO_F64)
158 inst = FMV_W_X | RS1(reg) | FRD(freg);
159 else
160 inst = FMV_X_W | FRS1(freg) | RD(reg);
161
162 if (!(op & SLJIT_32))
163 inst |= (sljit_ins)1 << 25;
164
165 return push_inst(compiler, inst);
166 }
167
emit_const(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw init_value,sljit_ins last_ins)168 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value, sljit_ins last_ins)
169 {
170 sljit_sw high;
171
172 if ((init_value & 0x800) != 0)
173 init_value += 0x1000;
174
175 high = init_value >> 32;
176
177 if ((init_value & 0x80000000l) != 0)
178 high = ~high;
179
180 if ((high & 0x800) != 0)
181 high += 0x1000;
182
183 FAIL_IF(push_inst(compiler, LUI | RD(TMP_REG3) | (sljit_ins)(high & ~0xfff)));
184 FAIL_IF(push_inst(compiler, ADDI | RD(TMP_REG3) | RS1(TMP_REG3) | IMM_I(high)));
185 FAIL_IF(push_inst(compiler, LUI | RD(dst) | (sljit_ins)(init_value & ~0xfff)));
186 FAIL_IF(push_inst(compiler, SLLI | RD(TMP_REG3) | RS1(TMP_REG3) | IMM_I(32)));
187 FAIL_IF(push_inst(compiler, XOR | RD(dst) | RS1(dst) | RS2(TMP_REG3)));
188 return push_inst(compiler, last_ins | RS1(dst) | IMM_I(init_value));
189 }
190
sljit_set_jump_addr(sljit_uw addr,sljit_uw new_target,sljit_sw executable_offset)191 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
192 {
193 sljit_ins *inst = (sljit_ins*)addr;
194 sljit_sw high;
195 SLJIT_UNUSED_ARG(executable_offset);
196
197 if ((new_target & 0x800) != 0)
198 new_target += 0x1000;
199
200 high = (sljit_sw)new_target >> 32;
201
202 if ((new_target & 0x80000000l) != 0)
203 high = ~high;
204
205 if ((high & 0x800) != 0)
206 high += 0x1000;
207
208 SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 0);
209
210 SLJIT_ASSERT((inst[0] & 0x7f) == LUI);
211 inst[0] = (inst[0] & 0xfff) | (sljit_ins)(high & ~0xfff);
212 SLJIT_ASSERT((inst[1] & 0x707f) == ADDI);
213 inst[1] = (inst[1] & 0xfffff) | IMM_I(high);
214 SLJIT_ASSERT((inst[2] & 0x7f) == LUI);
215 inst[2] = (inst[2] & 0xfff) | (sljit_ins)((sljit_sw)new_target & ~0xfff);
216 SLJIT_ASSERT((inst[5] & 0x707f) == ADDI || (inst[5] & 0x707f) == JALR);
217 inst[5] = (inst[5] & 0xfffff) | IMM_I(new_target);
218 SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 1);
219
220 inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
221 SLJIT_CACHE_FLUSH(inst, inst + 5);
222 }
223
