| 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 | /* |
| 14 | * MacOSX 15 uses an old version of libffi which contains |
| 15 | * #if FFI_GO_CLOSURES |
| 16 | * but does not define that in <ffitarget.h>, included from <ffi.h>. |
| 17 | * This was fixed upstream with |
| 18 | * https://github.com/libffi/libffi/commit/c23e9a1c |
| 19 | * We don't care about go closures one way or the other; |
| 20 | * just suppress the warning. |
| 21 | */ |
| 22 | #pragma GCC diagnostic push |
| 23 | #pragma GCC diagnostic ignored "-Wundef" |
| 24 | #include <ffi.h> |
| 25 | #pragma GCC diagnostic pop |
| 26 | #endif |
| 27 | #include "tcg/target-reg-bits.h" |
| 28 | |
| 29 | #define MAX_CALL_IARGS 7 |
| 30 | |
| 31 | /* |
| 32 | * Describe the calling convention of a given argument type. |
| 33 | */ |
| 34 | typedef enum { |
| 35 | TCG_CALL_RET_NORMAL, /* by registers */ |
| 36 | TCG_CALL_RET_BY_REF, /* for i128, by reference */ |
| 37 | TCG_CALL_RET_BY_VEC, /* for i128, by vector register */ |
| 38 | } TCGCallReturnKind; |
| 39 | |
| 40 | typedef enum { |
| 41 | TCG_CALL_ARG_NORMAL, /* by registers (continuing onto stack) */ |
| 42 | TCG_CALL_ARG_EVEN, /* like normal, but skipping odd slots */ |
| 43 | TCG_CALL_ARG_EXTEND, /* for i32, as a sign/zero-extended i64 */ |
| 44 | TCG_CALL_ARG_EXTEND_U, /* ... as a zero-extended i64 */ |
| 45 | TCG_CALL_ARG_EXTEND_S, /* ... as a sign-extended i64 */ |
| 46 | TCG_CALL_ARG_BY_REF, /* for i128, by reference, first */ |
| 47 | TCG_CALL_ARG_BY_REF_N, /* ... by reference, subsequent */ |
| 48 | } TCGCallArgumentKind; |
| 49 | |
| 50 | typedef struct TCGCallArgumentLoc { |
| 51 | TCGCallArgumentKind kind : 8; |
| 52 | unsigned arg_slot : 8; |
| 53 | unsigned ref_slot : 8; |
| 54 | unsigned arg_idx : 4; |
| 55 | unsigned tmp_subindex : 2; |
| 56 | } TCGCallArgumentLoc; |
| 57 | |
| 58 | struct TCGHelperInfo { |
| 59 | void *func; |
| 60 | const char *name; |
| 61 | |
| 62 | /* Used with g_once_init_enter. */ |
| 63 | #ifdef CONFIG_TCG_INTERPRETER |
| 64 | ffi_cif *cif; |
| 65 | #else |
| 66 | uintptr_t init; |
| 67 | #endif |
| 68 | |
| 69 | unsigned typemask : 32; |
| 70 | unsigned flags : 8; |
| 71 | unsigned nr_in : 8; |
| 72 | unsigned nr_out : 8; |
| 73 | TCGCallReturnKind out_kind : 8; |
| 74 | |
| 75 | /* Maximum physical arguments are constrained by TCG_TYPE_I128. */ |
| 76 | TCGCallArgumentLoc in[MAX_CALL_IARGS * (128 / TCG_TARGET_REG_BITS)]; |
| 77 | }; |
| 78 | |
| 79 | #endif /* TCG_HELPER_INFO_H */ |