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1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * LoongArch emulation for QEMU - main translation routines.
4  *
5  * Copyright (c) 2021 Loongson Technology Corporation Limited
6  */
7
8 #include "qemu/osdep.h"
9 #include "cpu.h"
10 #include "tcg/tcg-op.h"
11 #include "exec/translator.h"
12 #include "exec/helper-proto.h"
13 #include "exec/helper-gen.h"
14
15 #include "exec/translator.h"
16 #include "exec/log.h"
17 #include "qemu/qemu-print.h"
18 #include "translate.h"
19 #include "internals.h"
20
21 /* Global register indices */
22 TCGv cpu_gpr[32], cpu_pc;
23 static TCGv cpu_lladdr, cpu_llval;
24 TCGv_i32 cpu_fcsr0;
25 TCGv_i64 cpu_fpr[32];
26
27 #define DISAS_STOP       DISAS_TARGET_0
28
29 static inline int plus_1(DisasContext *ctx, int x)
30 {
31     return x + 1;
32 }
33
34 static inline int shl_2(DisasContext *ctx, int x)
35 {
36     return x << 2;
37 }
38
39 void generate_exception(DisasContext *ctx, int excp)
40 {
41     tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
42     gen_helper_raise_exception(cpu_env, tcg_constant_i32(excp));
43     ctx->base.is_jmp = DISAS_NORETURN;
44 }
45
46 static inline void gen_goto_tb(DisasContext *ctx, int n, target_ulong dest)
47 {
48     if (translator_use_goto_tb(&ctx->base, dest)) {
49         tcg_gen_goto_tb(n);
50         tcg_gen_movi_tl(cpu_pc, dest);
51         tcg_gen_exit_tb(ctx->base.tb, n);
52     } else {
53         tcg_gen_movi_tl(cpu_pc, dest);
54         tcg_gen_lookup_and_goto_ptr();
55     }
56 }
57
58 static void loongarch_tr_init_disas_context(DisasContextBase *dcbase,
59                                             CPUState *cs)
60 {
61     int64_t bound;
62     DisasContext *ctx = container_of(dcbase, DisasContext, base);
63
64     ctx->page_start = ctx->base.pc_first & TARGET_PAGE_MASK;
65     ctx->mem_idx = ctx->base.tb->flags;
66
67     /* Bound the number of insns to execute to those left on the page.  */
68     bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
69     ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
70
71     ctx->ntemp = 0;
72     memset(ctx->temp, 0, sizeof(ctx->temp));
73
74     ctx->zero = tcg_constant_tl(0);
75 }
76
77 static void loongarch_tr_tb_start(DisasContextBase *dcbase, CPUState *cs)
78 {
79 }
80
81 static void loongarch_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
82 {
83     DisasContext *ctx = container_of(dcbase, DisasContext, base);
84
85     tcg_gen_insn_start(ctx->base.pc_next);
86 }
87
88 /*
89  * Wrappers for getting reg values.
90  *
91  * The $zero register does not have cpu_gpr[0] allocated -- we supply the
92  * constant zero as a source, and an uninitialized sink as destination.
93  *
94  * Further, we may provide an extension for word operations.
95  */
96 static TCGv temp_new(DisasContext *ctx)
97 {
98     assert(ctx->ntemp < ARRAY_SIZE(ctx->temp));
99     return ctx->temp[ctx->ntemp++] = tcg_temp_new();
100 }
101
102 static TCGv gpr_src(DisasContext *ctx, int reg_num, DisasExtend src_ext)
103 {
104     TCGv t;
105
106     if (reg_num == 0) {
107         return ctx->zero;
108     }
109
110     switch (src_ext) {
111     case EXT_NONE:
112         return cpu_gpr[reg_num];
113     case EXT_SIGN:
114         t = temp_new(ctx);
115         tcg_gen_ext32s_tl(t, cpu_gpr[reg_num]);
116         return t;
117     case EXT_ZERO:
118         t = temp_new(ctx);
119         tcg_gen_ext32u_tl(t, cpu_gpr[reg_num]);
120         return t;
121     }
122     g_assert_not_reached();
123 }
124
125 static TCGv gpr_dst(DisasContext *ctx, int reg_num, DisasExtend dst_ext)
126 {
127     if (reg_num == 0 || dst_ext) {
128         return temp_new(ctx);
129     }
130     return cpu_gpr[reg_num];
131 }
132
133 static void gen_set_gpr(int reg_num, TCGv t, DisasExtend dst_ext)
134 {
135     if (reg_num != 0) {
136         switch (dst_ext) {
137         case EXT_NONE:
138             tcg_gen_mov_tl(cpu_gpr[reg_num], t);
139             break;
140         case EXT_SIGN:
141             tcg_gen_ext32s_tl(cpu_gpr[reg_num], t);
142             break;
143         case EXT_ZERO:
144             tcg_gen_ext32u_tl(cpu_gpr[reg_num], t);
145             break;
146         default:
147             g_assert_not_reached();
148         }
149     }
150 }
151
152 #include "decode-insns.c.inc"
153 #include "insn_trans/trans_arith.c.inc"
154 #include "insn_trans/trans_shift.c.inc"
155 #include "insn_trans/trans_bit.c.inc"
156 #include "insn_trans/trans_memory.c.inc"
157 #include "insn_trans/trans_atomic.c.inc"
158
159 static void loongarch_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
160 {
161     CPULoongArchState *env = cs->env_ptr;
162     DisasContext *ctx = container_of(dcbase, DisasContext, base);
163
164     ctx->opcode = cpu_ldl_code(env, ctx->base.pc_next);
165
166     if (!decode(ctx, ctx->opcode)) {
167         qemu_log_mask(LOG_UNIMP, "Error: unknown opcode. "
168                       TARGET_FMT_lx ": 0x%x\n",
169                       ctx->base.pc_next, ctx->opcode);
170         generate_exception(ctx, EXCCODE_INE);
171     }
172
173     for (int i = ctx->ntemp - 1; i >= 0; --i) {
174         tcg_temp_free(ctx->temp[i]);
175         ctx->temp[i] = NULL;
176     }
177     ctx->ntemp = 0;
178
179     ctx->base.pc_next += 4;
180 }
181
182 static void loongarch_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
183 {
184     DisasContext *ctx = container_of(dcbase, DisasContext, base);
185
186     switch (ctx->base.is_jmp) {
187     case DISAS_STOP:
188         tcg_gen_movi_tl(cpu_pc, ctx->base.pc_next);
189         tcg_gen_lookup_and_goto_ptr();
190         break;
191     case DISAS_TOO_MANY:
192         gen_goto_tb(ctx, 0, ctx->base.pc_next);
193         break;
194     case DISAS_NORETURN:
195         break;
196     default:
197         g_assert_not_reached();
198     }
199 }
200
201 static void loongarch_tr_disas_log(const DisasContextBase *dcbase,
202                                    CPUState *cpu, FILE *logfile)
203 {
204     qemu_log("IN: %s\n", lookup_symbol(dcbase->pc_first));
205     target_disas(logfile, cpu, dcbase->pc_first, dcbase->tb->size);
206 }
207
208 static const TranslatorOps loongarch_tr_ops = {
209     .init_disas_context = loongarch_tr_init_disas_context,
210     .tb_start           = loongarch_tr_tb_start,
211     .insn_start         = loongarch_tr_insn_start,
212     .translate_insn     = loongarch_tr_translate_insn,
213     .tb_stop            = loongarch_tr_tb_stop,
214     .disas_log          = loongarch_tr_disas_log,
215 };
216
217 void gen_intermediate_code(CPUState *cs, TranslationBlock *tb, int max_insns)
218 {
219     DisasContext ctx;
220
221     translator_loop(&loongarch_tr_ops, &ctx.base, cs, tb, max_insns);
222 }
223
224 void loongarch_translate_init(void)
225 {
226     int i;
227
228     cpu_gpr[0] = NULL;
229     for (i = 1; i < 32; i++) {
230         cpu_gpr[i] = tcg_global_mem_new(cpu_env,
231                                         offsetof(CPULoongArchState, gpr[i]),
232                                         regnames[i]);
233     }
234
235     for (i = 0; i < 32; i++) {
236         int off = offsetof(CPULoongArchState, fpr[i]);
237         cpu_fpr[i] = tcg_global_mem_new_i64(cpu_env, off, fregnames[i]);
238     }
239
240     cpu_pc = tcg_global_mem_new(cpu_env, offsetof(CPULoongArchState, pc), "pc");
241     cpu_fcsr0 = tcg_global_mem_new_i32(cpu_env,
242                     offsetof(CPULoongArchState, fcsr0), "fcsr0");
243     cpu_lladdr = tcg_global_mem_new(cpu_env,
244                     offsetof(CPULoongArchState, lladdr), "lladdr");
245     cpu_llval = tcg_global_mem_new(cpu_env,
246                     offsetof(CPULoongArchState, llval), "llval");
247 }
248
249 void restore_state_to_opc(CPULoongArchState *env, TranslationBlock *tb,
250                           target_ulong *data)
251 {
252     env->pc = data[0];
253 }
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