xref: /openbmc/qemu/tcg/tcg-pool.c.inc (revision 77c05b0b) 
1/*
2 * TCG Backend Data: constant pool.
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
23typedef struct TCGLabelPoolData {
24    struct TCGLabelPoolData *next;
25    tcg_insn_unit *label;
26    intptr_t addend;
27    int rtype;
28    unsigned nlong;
29    tcg_target_ulong data[];
30} TCGLabelPoolData;
31
32
33static TCGLabelPoolData *new_pool_alloc(TCGContext *s, int nlong, int rtype,
34                                        tcg_insn_unit *label, intptr_t addend)
35{
36    TCGLabelPoolData *n = tcg_malloc(sizeof(TCGLabelPoolData)
37                                     + sizeof(tcg_target_ulong) * nlong);
38
39    n->label = label;
40    n->addend = addend;
41    n->rtype = rtype;
42    n->nlong = nlong;
43    return n;
44}
45
46static void new_pool_insert(TCGContext *s, TCGLabelPoolData *n)
47{
48    TCGLabelPoolData *i, **pp;
49    int nlong = n->nlong;
50
51    /* Insertion sort on the pool.  */
52    for (pp = &s->pool_labels; (i = *pp) != NULL; pp = &i->next) {
53        if (nlong > i->nlong) {
54            break;
55        }
56        if (nlong < i->nlong) {
57            continue;
58        }
59        if (memcmp(n->data, i->data, sizeof(tcg_target_ulong) * nlong) >= 0) {
60            break;
61        }
62    }
63    n->next = *pp;
64    *pp = n;
65}
66
67/* The "usual" for generic integer code.  */
68static inline void new_pool_label(TCGContext *s, tcg_target_ulong d, int rtype,
69                                  tcg_insn_unit *label, intptr_t addend)
70{
71    TCGLabelPoolData *n = new_pool_alloc(s, 1, rtype, label, addend);
72    n->data[0] = d;
73    new_pool_insert(s, n);
74}
75
76/* For v64 or v128, depending on the host.  */
77static inline void new_pool_l2(TCGContext *s, int rtype, tcg_insn_unit *label,
78                               intptr_t addend, tcg_target_ulong d0,
79                               tcg_target_ulong d1)
80{
81    TCGLabelPoolData *n = new_pool_alloc(s, 2, rtype, label, addend);
82    n->data[0] = d0;
83    n->data[1] = d1;
84    new_pool_insert(s, n);
85}
86
87/* For v128 or v256, depending on the host.  */
88static inline void new_pool_l4(TCGContext *s, int rtype, tcg_insn_unit *label,
89                               intptr_t addend, tcg_target_ulong d0,
90                               tcg_target_ulong d1, tcg_target_ulong d2,
91                               tcg_target_ulong d3)
92{
93    TCGLabelPoolData *n = new_pool_alloc(s, 4, rtype, label, addend);
94    n->data[0] = d0;
95    n->data[1] = d1;
96    n->data[2] = d2;
97    n->data[3] = d3;
98    new_pool_insert(s, n);
99}
100
101/* For v256, for 32-bit host.  */
102static inline void new_pool_l8(TCGContext *s, int rtype, tcg_insn_unit *label,
103                               intptr_t addend, tcg_target_ulong d0,
104                               tcg_target_ulong d1, tcg_target_ulong d2,
105                               tcg_target_ulong d3, tcg_target_ulong d4,
106                               tcg_target_ulong d5, tcg_target_ulong d6,
107                               tcg_target_ulong d7)
108{
109    TCGLabelPoolData *n = new_pool_alloc(s, 8, rtype, label, addend);
110    n->data[0] = d0;
111    n->data[1] = d1;
112    n->data[2] = d2;
113    n->data[3] = d3;
114    n->data[4] = d4;
115    n->data[5] = d5;
116    n->data[6] = d6;
117    n->data[7] = d7;
118    new_pool_insert(s, n);
119}
120
121/* To be provided by cpu/tcg-target.c.inc.  */
122static void tcg_out_nop_fill(tcg_insn_unit *p, int count);
123
124static int tcg_out_pool_finalize(TCGContext *s)
125{
126    TCGLabelPoolData *p = s->pool_labels;
127    TCGLabelPoolData *l = NULL;
128    void *a;
129
130    if (p == NULL) {
131        return 0;
132    }
133
134    /* ??? Round up to qemu_icache_linesize, but then do not round
135       again when allocating the next TranslationBlock structure.  */
136    a = (void *)ROUND_UP((uintptr_t)s->code_ptr,
137                         sizeof(tcg_target_ulong) * p->nlong);
138    tcg_out_nop_fill(s->code_ptr, (tcg_insn_unit *)a - s->code_ptr);
139    s->data_gen_ptr = a;
140
141    for (; p != NULL; p = p->next) {
142        size_t size = sizeof(tcg_target_ulong) * p->nlong;
143        uintptr_t value;
144
145        if (!l || l->nlong != p->nlong || memcmp(l->data, p->data, size)) {
146            if (unlikely(a > s->code_gen_highwater)) {
147                return -1;
148            }
149            memcpy(a, p->data, size);
150            a += size;
151            l = p;
152        }
153
154        value = (uintptr_t)tcg_splitwx_to_rx(a) - size;
155        if (!patch_reloc(p->label, p->rtype, value, p->addend)) {
156            return -2;
157        }
158    }
159
160    s->code_ptr = a;
161    return 0;
162}
163