Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 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 |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 24 | |
| 25 | typedef struct TCGLabelQemuLdst { |
Richard Henderson | 9c53889 | 2014-09-02 13:59:47 -0700 | [diff] [blame] | 26 | bool is_ld; /* qemu_ld: true, qemu_st: false */ |
Richard Henderson | 3972ef6 | 2015-05-13 09:10:33 -0700 | [diff] [blame] | 27 | TCGMemOpIdx oi; |
Richard Henderson | 9c53889 | 2014-09-02 13:59:47 -0700 | [diff] [blame] | 28 | TCGType type; /* result type of a load */ |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 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 */ |
Richard Henderson | 1813e17 | 2014-03-28 12:56:22 -0700 | [diff] [blame] | 33 | tcg_insn_unit *raddr; /* gen code addr of the next IR of qemu_ld/st IR */ |
| 34 | tcg_insn_unit *label_ptr[2]; /* label pointers to be updated */ |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 35 | struct TCGLabelQemuLdst *next; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 36 | } TCGLabelQemuLdst; |
| 37 | |
| 38 | typedef struct TCGBackendData { |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 39 | TCGLabelQemuLdst *labels; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 40 | } TCGBackendData; |
| 41 | |
| 42 | |
| 43 | /* |
| 44 | * Initialize TB backend data at the beginning of the TB. |
| 45 | */ |
| 46 | |
| 47 | static inline void tcg_out_tb_init(TCGContext *s) |
| 48 | { |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 49 | s->be->labels = NULL; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | /* |
| 53 | * Generate TB finalization at the end of block |
| 54 | */ |
| 55 | |
| 56 | static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l); |
| 57 | static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l); |
| 58 | |
Richard Henderson | 23dceda | 2015-12-02 13:59:59 -0800 | [diff] [blame] | 59 | static bool tcg_out_tb_finalize(TCGContext *s) |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 60 | { |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 61 | TCGLabelQemuLdst *lb; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 62 | |
| 63 | /* qemu_ld/st slow paths */ |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 64 | for (lb = s->be->labels; lb != NULL; lb = lb->next) { |
| 65 | if (lb->is_ld) { |
| 66 | tcg_out_qemu_ld_slow_path(s, lb); |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 67 | } else { |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 68 | tcg_out_qemu_st_slow_path(s, lb); |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 69 | } |
Richard Henderson | 23dceda | 2015-12-02 13:59:59 -0800 | [diff] [blame] | 70 | |
| 71 | /* Test for (pending) buffer overflow. The assumption is that any |
| 72 | one operation beginning below the high water mark cannot overrun |
| 73 | the buffer completely. Thus we can test for overflow after |
| 74 | generating code without having to check during generation. */ |
| 75 | if (unlikely((void *)s->code_ptr > s->code_gen_highwater)) { |
| 76 | return false; |
| 77 | } |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 78 | } |
Richard Henderson | 23dceda | 2015-12-02 13:59:59 -0800 | [diff] [blame] | 79 | return true; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | /* |
| 83 | * Allocate a new TCGLabelQemuLdst entry. |
| 84 | */ |
| 85 | |
| 86 | static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s) |
| 87 | { |
| 88 | TCGBackendData *be = s->be; |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 89 | TCGLabelQemuLdst *l = tcg_malloc(sizeof(*l)); |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 90 | |
Richard Henderson | 686461c | 2014-09-30 07:18:06 -0700 | [diff] [blame] | 91 | l->next = be->labels; |
| 92 | be->labels = l; |
| 93 | return l; |
Richard Henderson | 9ecefc8 | 2013-10-03 14:51:24 -0500 | [diff] [blame] | 94 | } |
| 95 | #else |
| 96 | #include "tcg-be-null.h" |
| 97 | #endif /* CONFIG_SOFTMMU */ |