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      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 
     26 typedef 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 
     38 typedef 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 
     48 static 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 
     57 static void tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l);
     58 static void tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l);
     59 
     60 static 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 
     79 static 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