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_UNUSED_ARG(tmp_r);
30 SLJIT_ASSERT(dst_r != tmp_r);
31
32 if (imm <= SIMM_MAX && imm >= SIMM_MIN)
33 return push_inst(compiler, ADDI | RD(dst_r) | RS1(TMP_ZERO) | IMM_I(imm));
34
35 if (imm & 0x800)
36 imm += 0x1000;
37
38 FAIL_IF(push_inst(compiler, LUI | RD(dst_r) | (sljit_ins)(imm & ~0xfff)));
39
40 if ((imm & 0xfff) == 0)
41 return SLJIT_SUCCESS;
42
43 return push_inst(compiler, ADDI | RD(dst_r) | RS1(dst_r) | IMM_I(imm));
44 }
45
emit_const(struct sljit_compiler * compiler,sljit_s32 dst,sljit_sw init_value,sljit_ins last_ins)46 static SLJIT_INLINE sljit_s32 emit_const(struct sljit_compiler *compiler, sljit_s32 dst, sljit_sw init_value, sljit_ins last_ins)
47 {
48 if ((init_value & 0x800) != 0)
49 init_value += 0x1000;
50
51 FAIL_IF(push_inst(compiler, LUI | RD(dst) | (sljit_ins)(init_value & ~0xfff)));
52 return push_inst(compiler, last_ins | RS1(dst) | IMM_I(init_value));
53 }
54
sljit_set_jump_addr(sljit_uw addr,sljit_uw new_target,sljit_sw executable_offset)55 SLJIT_API_FUNC_ATTRIBUTE void sljit_set_jump_addr(sljit_uw addr, sljit_uw new_target, sljit_sw executable_offset)
56 {
57 sljit_ins *inst = (sljit_ins*)addr;
58 SLJIT_UNUSED_ARG(executable_offset);
59
60 if ((new_target & 0x800) != 0)
61 new_target += 0x1000;
62
63 SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 0);
64
65 SLJIT_ASSERT((inst[0] & 0x7f) == LUI);
66 inst[0] = (inst[0] & 0xfff) | (sljit_ins)((sljit_sw)new_target & ~0xfff);
67 SLJIT_ASSERT((inst[1] & 0x707f) == ADDI || (inst[1] & 0x707f) == JALR);
68 inst[1] = (inst[1] & 0xfffff) | IMM_I(new_target);
69
70 SLJIT_UPDATE_WX_FLAGS(inst, inst + 5, 1);
71 inst = (sljit_ins *)SLJIT_ADD_EXEC_OFFSET(inst, executable_offset);
72 SLJIT_CACHE_FLUSH(inst, inst + 5);
73 }
74
