tcg/tcg-internal.h

   1 /*
   2  * Internal declarations for Tiny Code Generator for QEMU
   3  *
   4  * Copyright (c) 2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #ifndef TCG_INTERNAL_H
  26 #define TCG_INTERNAL_H
  27
  28 #ifdef CONFIG_TCG_INTERPRETER
  29 #include <ffi.h>
  30 #endif
  31
  32 #define TCG_HIGHWATER 1024
  33
  34 /*
  35  * Describe the calling convention of a given argument type.
  36  */
  37 typedef enum {
  38     TCG_CALL_RET_NORMAL,         /* by registers */
  39 } TCGCallReturnKind;
  40
  41 typedef enum {
  42     TCG_CALL_ARG_NORMAL,         /* by registers (continuing onto stack) */
  43     TCG_CALL_ARG_EVEN,           /* like normal, but skipping odd slots */
  44     TCG_CALL_ARG_EXTEND,         /* for i32, as a sign/zero-extended i64 */
  45     TCG_CALL_ARG_EXTEND_U,       /*      ... as a zero-extended i64 */
  46     TCG_CALL_ARG_EXTEND_S,       /*      ... as a sign-extended i64 */
  47 } TCGCallArgumentKind;
  48
  49 typedef struct TCGCallArgumentLoc {
  50     TCGCallArgumentKind kind    : 8;
  51     unsigned arg_slot           : 8;
  52     unsigned ref_slot           : 8;
  53     unsigned arg_idx            : 4;
  54     unsigned tmp_subindex       : 2;
  55 } TCGCallArgumentLoc;
  56
  57 /* Avoid "unsigned < 0 is always false" Werror, when iarg_regs is empty. */
  58 #define REG_P(L) \
  59     ((int)(L)->arg_slot < (int)ARRAY_SIZE(tcg_target_call_iarg_regs))
  60
  61 typedef struct TCGHelperInfo {
  62     void *func;
  63     const char *name;
  64 #ifdef CONFIG_TCG_INTERPRETER
  65     ffi_cif *cif;
  66 #endif
  67     unsigned typemask           : 32;
  68     unsigned flags              : 8;
  69     unsigned nr_in              : 8;
  70     unsigned nr_out             : 8;
  71     TCGCallReturnKind out_kind  : 8;
  72
  73     /* Maximum physical arguments are constrained by TCG_TYPE_I128. */
  74     TCGCallArgumentLoc in[MAX_CALL_IARGS * (128 / TCG_TARGET_REG_BITS)];
  75 } TCGHelperInfo;
  76
  77 extern TCGContext tcg_init_ctx;
  78 extern TCGContext **tcg_ctxs;
  79 extern unsigned int tcg_cur_ctxs;
  80 extern unsigned int tcg_max_ctxs;
  81
  82 void tcg_region_init(size_t tb_size, int splitwx, unsigned max_cpus);
  83 bool tcg_region_alloc(TCGContext *s);
  84 void tcg_region_initial_alloc(TCGContext *s);
  85 void tcg_region_prologue_set(TCGContext *s);
  86
  87 static inline void *tcg_call_func(TCGOp *op)
  88 {
  89     return (void *)(uintptr_t)op->args[TCGOP_CALLO(op) + TCGOP_CALLI(op)];
  90 }
  91
  92 static inline const TCGHelperInfo *tcg_call_info(TCGOp *op)
  93 {
  94     return (void *)(uintptr_t)op->args[TCGOP_CALLO(op) + TCGOP_CALLI(op) + 1];
  95 }
  96
  97 static inline unsigned tcg_call_flags(TCGOp *op)
  98 {
  99     return tcg_call_info(op)->flags;
 100 }
 101
 102 #if TCG_TARGET_REG_BITS == 32
 103 static inline TCGv_i32 TCGV_LOW(TCGv_i64 t)
 104 {
 105     return temp_tcgv_i32(tcgv_i64_temp(t) + HOST_BIG_ENDIAN);
 106 }
 107 static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
 108 {
 109     return temp_tcgv_i32(tcgv_i64_temp(t) + !HOST_BIG_ENDIAN);
 110 }
 111 #else
 112 extern TCGv_i32 TCGV_LOW(TCGv_i64) QEMU_ERROR("32-bit code path is reachable");
 113 extern TCGv_i32 TCGV_HIGH(TCGv_i64) QEMU_ERROR("32-bit code path is reachable");
 114 #endif
 115
 116 #endif /* TCG_INTERNAL_H */