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9ecefc84 RH |
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 | ||
9ecefc84 RH |
23 | /* |
24 | * Generate TB finalization at the end of block | |
25 | */ | |
26 | ||
aeee05f5 RH |
27 | static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l); |
28 | static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l); | |
9ecefc84 | 29 | |
aeee05f5 | 30 | static int tcg_out_ldst_finalize(TCGContext *s) |
9ecefc84 | 31 | { |
686461c9 | 32 | TCGLabelQemuLdst *lb; |
9ecefc84 RH |
33 | |
34 | /* qemu_ld/st slow paths */ | |
6001f772 | 35 | QSIMPLEQ_FOREACH(lb, &s->ldst_labels, next) { |
aeee05f5 RH |
36 | if (lb->is_ld |
37 | ? !tcg_out_qemu_ld_slow_path(s, lb) | |
38 | : !tcg_out_qemu_st_slow_path(s, lb)) { | |
39 | return -2; | |
9ecefc84 | 40 | } |
23dceda6 RH |
41 | |
42 | /* Test for (pending) buffer overflow. The assumption is that any | |
43 | one operation beginning below the high water mark cannot overrun | |
44 | the buffer completely. Thus we can test for overflow after | |
45 | generating code without having to check during generation. */ | |
46 | if (unlikely((void *)s->code_ptr > s->code_gen_highwater)) { | |
aeee05f5 | 47 | return -1; |
23dceda6 | 48 | } |
9ecefc84 | 49 | } |
aeee05f5 | 50 | return 0; |
9ecefc84 RH |
51 | } |
52 | ||
53 | /* | |
54 | * Allocate a new TCGLabelQemuLdst entry. | |
55 | */ | |
56 | ||
57 | static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s) | |
58 | { | |
686461c9 | 59 | TCGLabelQemuLdst *l = tcg_malloc(sizeof(*l)); |
9ecefc84 | 60 | |
4745b156 | 61 | memset(l, 0, sizeof(*l)); |
6001f772 LV |
62 | QSIMPLEQ_INSERT_TAIL(&s->ldst_labels, l, next); |
63 | ||
686461c9 | 64 | return l; |
9ecefc84 | 65 | } |