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     TCGMemOpIdx oi;
  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     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 */
  35     struct TCGLabelQemuLdst *next;
  36 } TCGLabelQemuLdst;
  37
  38 typedef struct TCGBackendData {
  39     TCGLabelQemuLdst *labels;
  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 {
  49     s->be->labels = NULL;
  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
  59 static void tcg_out_tb_finalize(TCGContext *s)
  60 {
  61     TCGLabelQemuLdst *lb;
  62
  63     /* qemu_ld/st slow paths */
  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);
  67         } else {
  68             tcg_out_qemu_st_slow_path(s, lb);
  69         }
  70     }
  71 }
  72
  73 /*
  74  * Allocate a new TCGLabelQemuLdst entry.
  75  */
  76
  77 static inline TCGLabelQemuLdst *new_ldst_label(TCGContext *s)
  78 {
  79     TCGBackendData *be = s->be;
  80     TCGLabelQemuLdst *l = tcg_malloc(sizeof(*l));
  81
  82     l->next = be->labels;
  83     be->labels = l;
  84     return l;
  85 }
  86 #else
  87 #include "tcg-be-null.h"
  88 #endif /* CONFIG_SOFTMMU */