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
  16 /*
  17  * Describe the calling convention of a given argument type.
  18  */
  19 typedef enum {
  20     TCG_CALL_RET_NORMAL,         /* by registers */
  21     TCG_CALL_RET_BY_REF,         /* for i128, by reference */
  22     TCG_CALL_RET_BY_VEC,         /* for i128, by vector register */
  23 } TCGCallReturnKind;
  24
  25 typedef enum {
  26     TCG_CALL_ARG_NORMAL,         /* by registers (continuing onto stack) */
  27     TCG_CALL_ARG_EVEN,           /* like normal, but skipping odd slots */
  28     TCG_CALL_ARG_EXTEND,         /* for i32, as a sign/zero-extended i64 */
  29     TCG_CALL_ARG_EXTEND_U,       /*      ... as a zero-extended i64 */
  30     TCG_CALL_ARG_EXTEND_S,       /*      ... as a sign-extended i64 */
  31     TCG_CALL_ARG_BY_REF,         /* for i128, by reference, first */
  32     TCG_CALL_ARG_BY_REF_N,       /*       ... by reference, subsequent */
  33 } TCGCallArgumentKind;
  34
  35 typedef struct TCGCallArgumentLoc {
  36     TCGCallArgumentKind kind    : 8;
  37     unsigned arg_slot           : 8;
  38     unsigned ref_slot           : 8;
  39     unsigned arg_idx            : 4;
  40     unsigned tmp_subindex       : 2;
  41 } TCGCallArgumentLoc;
  42
  43 struct TCGHelperInfo {
  44     void *func;
  45     const char *name;
  46
  47     /* Used with g_once_init_enter. */
  48 #ifdef CONFIG_TCG_INTERPRETER
  49     ffi_cif *cif;
  50 #else
  51     uintptr_t init;
  52 #endif
  53
  54     unsigned typemask           : 32;
  55     unsigned flags              : 8;
  56     unsigned nr_in              : 8;
  57     unsigned nr_out             : 8;
  58     TCGCallReturnKind out_kind  : 8;
  59
  60     /* Maximum physical arguments are constrained by TCG_TYPE_I128. */
  61     TCGCallArgumentLoc in[MAX_CALL_IARGS * (128 / TCG_TARGET_REG_BITS)];
  62 };
  63
  64 #endif /* TCG_HELPER_INFO_H */