tcg/tcg-be-ldst.h

   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
  25 typedef struct TCGLabelQemuLdst {
  26     bool is_ld;             /* qemu_ld: true, qemu_st: false */
  27     TCGMemOp opc;
  28     TCGType type;           /* result type of a load */
  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     tcg_insn_unit *raddr;   /* gen code addr of the next IR of qemu_ld/st IR */
  35     tcg_insn_unit *label_ptr[2]; /* label pointers to be updated */
  36     struct TCGLabelQemuLdst *next;
  37 } TCGLabelQemuLdst;
  38
  39 typedef struct TCGBackendData {
  40     TCGLabelQemuLdst *labels;
  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->labels = NULL;
  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;
  63
  64     /* qemu_ld/st slow paths */
  65     for (lb = s->be->labels; lb != NULL; lb = lb->next) {
  66         if (lb->is_ld) {
  67             tcg_out_qemu_ld_slow_path(s, lb);
  68         } else {
  69             tcg_out_qemu_st_slow_path(s, lb);
  70         }
  71     }
  72 }
  73
  74 /*
  75  * Allocate a new TCGLabelQemuLdst entry.
  76  */
  77
  78 static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s)
  79 {
  80     TCGBackendData *be = s->be;
  81     TCGLabelQemuLdst *l = tcg_malloc(sizeof(*l));
  82
  83     l->next = be->labels;
  84     be->labels = l;
  85     return l;
  86 }
  87 #else
  88 #include "tcg-be-null.h"
  89 #endif /* CONFIG_SOFTMMU */