1/*
2 * TCG Backend Data: load-store optimization only.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22
23#ifdef CONFIG_SOFTMMU
24#define TCG_MAX_QEMU_LDST       640
25
26typedef struct TCGLabelQemuLdst {
27    int is_ld:1;            /* qemu_ld: 1, qemu_st: 0 */
28    TCGMemOp opc:4;
29    TCGReg addrlo_reg;      /* reg index for low word of guest virtual addr */
30    TCGReg addrhi_reg;      /* reg index for high word of guest virtual addr */
31    TCGReg datalo_reg;      /* reg index for low word to be loaded or stored */
32    TCGReg datahi_reg;      /* reg index for high word to be loaded or stored */
33    int mem_index;          /* soft MMU memory index */
34    uint8_t *raddr;         /* gen code addr of the next IR of qemu_ld/st IR */
35    uint8_t *label_ptr[2];  /* label pointers to be updated */
36} TCGLabelQemuLdst;
37
38typedef struct TCGBackendData {
39    int nb_ldst_labels;
40    TCGLabelQemuLdst ldst_labels[TCG_MAX_QEMU_LDST];
41} TCGBackendData;
42
43
44/*
45 * Initialize TB backend data at the beginning of the TB.
46 */
47
48static inline void tcg_out_tb_init(TCGContext *s)
49{
50    s->be->nb_ldst_labels = 0;
51}
52
53/*
54 * Generate TB finalization at the end of block
55 */
56
57static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l);
58static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l);
59
60static void tcg_out_tb_finalize(TCGContext *s)
61{
62    TCGLabelQemuLdst *lb = s->be->ldst_labels;
63    int i, n = s->be->nb_ldst_labels;
64
65    /* qemu_ld/st slow paths */
66    for (i = 0; i < n; i++) {
67        if (lb[i].is_ld) {
68            tcg_out_qemu_ld_slow_path(s, lb + i);
69        } else {
70            tcg_out_qemu_st_slow_path(s, lb + i);
71        }
72    }
73}
74
75/*
76 * Allocate a new TCGLabelQemuLdst entry.
77 */
78
79static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s)
80{
81    TCGBackendData *be = s->be;
82    int n = be->nb_ldst_labels;
83
84    assert(n < TCG_MAX_QEMU_LDST);
85    be->nb_ldst_labels = n + 1;
86    return &be->ldst_labels[n];
87}
88#else
89#include "tcg-be-null.h"
90#endif /* CONFIG_SOFTMMU */
91