include/tcg/helper-info.h

   1 /*
   2  * TCG Helper Information Structure
   3  *
   4  * Copyright (c) 2023 Linaro Ltd
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-or-later
   7  */
   8
   9 #ifndef TCG_HELPER_INFO_H
  10 #define TCG_HELPER_INFO_H
  11
  12 #ifdef CONFIG_TCG_INTERPRETER
  13 #include <ffi.h>
  14 #endif
  15 #include "tcg-target-reg-bits.h"
  16
  17 #define MAX_CALL_IARGS  7
  18
  19 /*
  20  * Describe the calling convention of a given argument type.
  21  */
  22 typedef enum {
  23     TCG_CALL_RET_NORMAL,         /* by registers */
  24     TCG_CALL_RET_BY_REF,         /* for i128, by reference */
  25     TCG_CALL_RET_BY_VEC,         /* for i128, by vector register */
  26 } TCGCallReturnKind;
  27
  28 typedef enum {
  29     TCG_CALL_ARG_NORMAL,         /* by registers (continuing onto stack) */
  30     TCG_CALL_ARG_EVEN,           /* like normal, but skipping odd slots */
  31     TCG_CALL_ARG_EXTEND,         /* for i32, as a sign/zero-extended i64 */
  32     TCG_CALL_ARG_EXTEND_U,       /*      ... as a zero-extended i64 */
  33     TCG_CALL_ARG_EXTEND_S,       /*      ... as a sign-extended i64 */
  34     TCG_CALL_ARG_BY_REF,         /* for i128, by reference, first */
  35     TCG_CALL_ARG_BY_REF_N,       /*       ... by reference, subsequent */
  36 } TCGCallArgumentKind;
  37
  38 typedef struct TCGCallArgumentLoc {
  39     TCGCallArgumentKind kind    : 8;
  40     unsigned arg_slot           : 8;
  41     unsigned ref_slot           : 8;
  42     unsigned arg_idx            : 4;
  43     unsigned tmp_subindex       : 2;
  44 } TCGCallArgumentLoc;
  45
  46 struct TCGHelperInfo {
  47     void *func;
  48     const char *name;
  49
  50     /* Used with g_once_init_enter. */
  51 #ifdef CONFIG_TCG_INTERPRETER
  52     ffi_cif *cif;
  53 #else
  54     uintptr_t init;
  55 #endif
  56
  57     unsigned typemask           : 32;
  58     unsigned flags              : 8;
  59     unsigned nr_in              : 8;
  60     unsigned nr_out             : 8;
  61     TCGCallReturnKind out_kind  : 8;
  62
  63     /* Maximum physical arguments are constrained by TCG_TYPE_I128. */
  64     TCGCallArgumentLoc in[MAX_CALL_IARGS * (128 / TCG_TARGET_REG_BITS)];
  65 };
  66
  67 #endif /* TCG_HELPER_INFO_H */