| 1 | /*
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| 2 | * Tiny Code Generator for QEMU
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| 3 | *
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| 4 | * Copyright (c) 2008 Fabrice Bellard
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| 5 | *
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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| 7 | * of this software and associated documentation files (the "Software"), to deal
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| 8 | * in the Software without restriction, including without limitation the rights
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 10 | * copies of the Software, and to permit persons to whom the Software is
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| 11 | * furnished to do so, subject to the following conditions:
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| 12 | *
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| 13 | * The above copyright notice and this permission notice shall be included in
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| 14 | * all copies or substantial portions of the Software.
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| 15 | *
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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| 22 | * THE SOFTWARE.
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| 23 | */
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| 24 | #include "qemu-common.h"
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| 25 | #include "tcg-target.h"
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| 26 | #include "tcg-runtime.h"
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| 27 |
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| 28 | #if TCG_TARGET_REG_BITS == 32
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| 29 | typedef int32_t tcg_target_long;
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| 30 | typedef uint32_t tcg_target_ulong;
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| 31 | #define TCG_PRIlx PRIx32
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| 32 | #define TCG_PRIld PRId32
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| 33 | #elif TCG_TARGET_REG_BITS == 64
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| 34 | typedef int64_t tcg_target_long;
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| 35 | typedef uint64_t tcg_target_ulong;
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| 36 | #define TCG_PRIlx PRIx64
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| 37 | #define TCG_PRIld PRId64
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| 38 | #else
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| 39 | #error unsupported
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| 40 | #endif
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| 41 |
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| 42 | #if TCG_TARGET_NB_REGS <= 32
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| 43 | typedef uint32_t TCGRegSet;
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| 44 | #elif TCG_TARGET_NB_REGS <= 64
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| 45 | typedef uint64_t TCGRegSet;
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| 46 | #else
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| 47 | #error unsupported
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| 48 | #endif
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| 49 |
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| 50 | enum {
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| 51 | #define DEF(s, n, copy_size) INDEX_op_ ## s,
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| 52 | #include "tcg-opc.h"
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| 53 | #undef DEF
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| 54 | NB_OPS,
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| 55 | };
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| 56 |
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| 57 | #define tcg_regset_clear(d) (d) = 0
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| 58 | #define tcg_regset_set(d, s) (d) = (s)
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| 59 | #define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)
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| 60 | #define tcg_regset_set_reg(d, r) (d) |= 1L << (r)
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| 61 | #define tcg_regset_reset_reg(d, r) (d) &= ~(1L << (r))
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| 62 | #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)
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| 63 | #define tcg_regset_or(d, a, b) (d) = (a) | (b)
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| 64 | #define tcg_regset_and(d, a, b) (d) = (a) & (b)
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| 65 | #define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)
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| 66 | #define tcg_regset_not(d, a) (d) = ~(a)
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| 67 |
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| 68 | typedef struct TCGRelocation {
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| 69 | struct TCGRelocation *next;
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| 70 | int type;
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| 71 | uint8_t *ptr;
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| 72 | tcg_target_long addend;
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| 73 | } TCGRelocation;
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| 74 |
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| 75 | typedef struct TCGLabel {
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| 76 | int has_value;
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| 77 | union {
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| 78 | tcg_target_ulong value;
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| 79 | TCGRelocation *first_reloc;
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| 80 | } u;
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| 81 | } TCGLabel;
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| 82 |
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| 83 | typedef struct TCGPool {
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| 84 | struct TCGPool *next;
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| 85 | int size;
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| 86 | uint8_t data[0] __attribute__ ((aligned));
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| 87 | } TCGPool;
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| 88 |
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| 89 | #define TCG_POOL_CHUNK_SIZE 32768
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| 90 |
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| 91 | #define TCG_MAX_LABELS 512
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| 92 |
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| 93 | #define TCG_MAX_TEMPS 512
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| 94 |
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| 95 | /* when the size of the arguments of a called function is smaller than
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| 96 | this value, they are statically allocated in the TB stack frame */
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| 97 | #define TCG_STATIC_CALL_ARGS_SIZE 128
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| 98 |
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| 99 | typedef int TCGType;
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| 100 |
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| 101 | #define TCG_TYPE_I32 0
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| 102 | #define TCG_TYPE_I64 1
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| 103 | #define TCG_TYPE_COUNT 2 /* number of different types */
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| 104 |
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| 105 | #if TCG_TARGET_REG_BITS == 32
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| 106 | #define TCG_TYPE_PTR TCG_TYPE_I32
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| 107 | #else
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| 108 | #define TCG_TYPE_PTR TCG_TYPE_I64
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| 109 | #endif
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| 110 |
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| 111 | typedef tcg_target_ulong TCGArg;
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| 112 |
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| 113 | /* Define a type and accessor macros for varables. Using a struct is
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| 114 | nice because it gives some level of type safely. Ideally the compiler
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| 115 | be able to see through all this. However in practice this is not true,
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| 116 | expecially on targets with braindamaged ABIs (e.g. i386).
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| 117 | We use plain int by default to avoid this runtime overhead.
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| 118 | Users of tcg_gen_* don't need to know about any of this, and should
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| 119 | treat TCGv as an opaque type.
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| 120 | In additon we do typechecking for different types of variables. TCGv_i32
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| 121 | and TCGv_i64 are 32/64-bit variables respectively. TCGv and TCGv_ptr
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| 122 | are aliases for target_ulong and host pointer sized values respectively.
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| 123 | */
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| 124 |
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| 125 | #ifdef CONFIG_DEBUG_TCG
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| 126 | #define DEBUG_TCGV 1
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| 127 | #endif
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| 128 |
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| 129 | #ifdef DEBUG_TCGV
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| 130 |
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| 131 | typedef struct
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| 132 | {
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| 133 | int i32;
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| 134 | } TCGv_i32;
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| 135 |
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| 136 | typedef struct
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| 137 | {
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| 138 | int i64;
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| 139 | } TCGv_i64;
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| 140 |
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| 141 | #define MAKE_TCGV_I32(i) __extension__ \
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| 142 | ({ TCGv_i32 make_tcgv_tmp = {i}; make_tcgv_tmp;})
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| 143 | #define MAKE_TCGV_I64(i) __extension__ \
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| 144 | ({ TCGv_i64 make_tcgv_tmp = {i}; make_tcgv_tmp;})
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| 145 | #define GET_TCGV_I32(t) ((t).i32)
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| 146 | #define GET_TCGV_I64(t) ((t).i64)
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| 147 | #if TCG_TARGET_REG_BITS == 32
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| 148 | #define TCGV_LOW(t) MAKE_TCGV_I32(GET_TCGV_I64(t))
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| 149 | #define TCGV_HIGH(t) MAKE_TCGV_I32(GET_TCGV_I64(t) + 1)
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| 150 | #endif
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| 151 |
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| 152 | #else /* !DEBUG_TCGV */
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| 153 |
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| 154 | typedef int TCGv_i32;
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| 155 | typedef int TCGv_i64;
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| 156 | #define MAKE_TCGV_I32(x) (x)
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| 157 | #define MAKE_TCGV_I64(x) (x)
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| 158 | #define GET_TCGV_I32(t) (t)
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| 159 | #define GET_TCGV_I64(t) (t)
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| 160 |
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| 161 | #if TCG_TARGET_REG_BITS == 32
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| 162 | #define TCGV_LOW(t) (t)
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| 163 | #define TCGV_HIGH(t) ((t) + 1)
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| 164 | #endif
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| 165 |
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| 166 | #endif /* DEBUG_TCGV */
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| 167 |
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| 168 | #define TCGV_EQUAL_I32(a, b) (GET_TCGV_I32(a) == GET_TCGV_I32(b))
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| 169 | #define TCGV_EQUAL_I64(a, b) (GET_TCGV_I64(a) == GET_TCGV_I64(b))
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| 170 |
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| 171 | /* Dummy definition to avoid compiler warnings. */
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| 172 | #define TCGV_UNUSED_I32(x) x = MAKE_TCGV_I32(-1)
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| 173 | #define TCGV_UNUSED_I64(x) x = MAKE_TCGV_I64(-1)
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| 174 |
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| 175 | /* call flags */
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| 176 | #define TCG_CALL_TYPE_MASK 0x000f
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| 177 | #define TCG_CALL_TYPE_STD 0x0000 /* standard C call */
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| 178 | #define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */
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| 179 | #define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */
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| 180 | #define TCG_CALL_TYPE_REGPARM 0x0003 /* i386 style regparm call (3 regs) */
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| 181 | /* A pure function only reads its arguments and TCG global variables
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| 182 | and cannot raise exceptions. Hence a call to a pure function can be
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| 183 | safely suppressed if the return value is not used. */
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| 184 | #define TCG_CALL_PURE 0x0010
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| 185 | /* A const function only reads its arguments and does not use TCG
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| 186 | global variables. Hence a call to such a function does not
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| 187 | save TCG global variables back to their canonical location. */
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| 188 | #define TCG_CALL_CONST 0x0020
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| 189 |
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| 190 | /* used to align parameters */
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| 191 | #define TCG_CALL_DUMMY_TCGV MAKE_TCGV_I32(-1)
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| 192 | #define TCG_CALL_DUMMY_ARG ((TCGArg)(-1))
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| 193 |
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| 194 | typedef enum {
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| 195 | TCG_COND_EQ,
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| 196 | TCG_COND_NE,
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| 197 | TCG_COND_LT,
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| 198 | TCG_COND_GE,
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| 199 | TCG_COND_LE,
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| 200 | TCG_COND_GT,
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| 201 | /* unsigned */
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| 202 | TCG_COND_LTU,
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| 203 | TCG_COND_GEU,
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| 204 | TCG_COND_LEU,
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| 205 | TCG_COND_GTU,
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| 206 | } TCGCond;
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| 207 |
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| 208 | #define TEMP_VAL_DEAD 0
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| 209 | #define TEMP_VAL_REG 1
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| 210 | #define TEMP_VAL_MEM 2
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| 211 | #define TEMP_VAL_CONST 3
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| 212 |
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| 213 | /* XXX: optimize memory layout */
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| 214 | typedef struct TCGTemp {
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| 215 | TCGType base_type;
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| 216 | TCGType type;
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| 217 | int val_type;
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| 218 | int reg;
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| 219 | tcg_target_long val;
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| 220 | int mem_reg;
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| 221 | tcg_target_long mem_offset;
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| 222 | unsigned int fixed_reg:1;
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| 223 | unsigned int mem_coherent:1;
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| 224 | unsigned int mem_allocated:1;
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| 225 | unsigned int temp_local:1; /* If true, the temp is saved accross
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| 226 | basic blocks. Otherwise, it is not
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| 227 | preserved accross basic blocks. */
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| 228 | unsigned int temp_allocated:1; /* never used for code gen */
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| 229 | /* index of next free temp of same base type, -1 if end */
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| 230 | int next_free_temp;
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| 231 | const char *name;
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| 232 | } TCGTemp;
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| 233 |
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| 234 | typedef struct TCGHelperInfo {
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| 235 | tcg_target_ulong func;
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| 236 | const char *name;
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| 237 | } TCGHelperInfo;
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| 238 |
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| 239 | typedef struct TCGContext TCGContext;
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| 240 |
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| 241 | struct TCGContext {
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| 242 | uint8_t *pool_cur, *pool_end;
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| 243 | TCGPool *pool_first, *pool_current;
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| 244 | TCGLabel *labels;
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| 245 | int nb_labels;
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| 246 | TCGTemp *temps; /* globals first, temps after */
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| 247 | int nb_globals;
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| 248 | int nb_temps;
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| 249 | /* index of free temps, -1 if none */
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| 250 | int first_free_temp[TCG_TYPE_COUNT * 2];
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| 251 |
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| 252 | /* goto_tb support */
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| 253 | uint8_t *code_buf;
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| 254 | unsigned long *tb_next;
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| 255 | uint16_t *tb_next_offset;
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| 256 | uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */
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| 257 |
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| 258 | /* liveness analysis */
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| 259 | uint16_t *op_dead_iargs; /* for each operation, each bit tells if the
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| 260 | corresponding input argument is dead */
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| 261 |
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| 262 | /* tells in which temporary a given register is. It does not take
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| 263 | into account fixed registers */
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| 264 | int reg_to_temp[TCG_TARGET_NB_REGS];
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| 265 | TCGRegSet reserved_regs;
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| 266 | tcg_target_long current_frame_offset;
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| 267 | tcg_target_long frame_start;
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| 268 | tcg_target_long frame_end;
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| 269 | int frame_reg;
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| 270 |
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| 271 | uint8_t *code_ptr;
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| 272 | TCGTemp static_temps[TCG_MAX_TEMPS];
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| 273 |
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| 274 | TCGHelperInfo *helpers;
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| 275 | int nb_helpers;
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| 276 | int allocated_helpers;
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| 277 | int helpers_sorted;
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| 278 |
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| 279 | #ifdef CONFIG_PROFILER
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| 280 | /* profiling info */
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| 281 | int64_t tb_count1;
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| 282 | int64_t tb_count;
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| 283 | int64_t op_count; /* total insn count */
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| 284 | int op_count_max; /* max insn per TB */
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| 285 | int64_t temp_count;
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| 286 | int temp_count_max;
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| 287 | int64_t del_op_count;
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| 288 | int64_t code_in_len;
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| 289 | int64_t code_out_len;
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| 290 | int64_t interm_time;
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| 291 | int64_t code_time;
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| 292 | int64_t la_time;
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| 293 | int64_t restore_count;
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| 294 | int64_t restore_time;
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| 295 | #endif
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| 296 | };
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| 297 |
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| 298 | extern TCGContext tcg_ctx;
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| 299 | extern uint16_t *gen_opc_ptr;
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| 300 | extern TCGArg *gen_opparam_ptr;
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| 301 | extern uint16_t gen_opc_buf[];
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| 302 | extern TCGArg gen_opparam_buf[];
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| 303 |
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| 304 | /* pool based memory allocation */
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| 305 |
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| 306 | void *tcg_malloc_internal(TCGContext *s, int size);
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| 307 | void tcg_pool_reset(TCGContext *s);
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| 308 | void tcg_pool_delete(TCGContext *s);
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| 309 |
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| 310 | static inline void *tcg_malloc(int size)
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| 311 | {
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| 312 | TCGContext *s = &tcg_ctx;
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| 313 | uint8_t *ptr, *ptr_end;
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| 314 | size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);
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| 315 | ptr = s->pool_cur;
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| 316 | ptr_end = ptr + size;
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| 317 | if (unlikely(ptr_end > s->pool_end)) {
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| 318 | return tcg_malloc_internal(&tcg_ctx, size);
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| 319 | } else {
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| 320 | s->pool_cur = ptr_end;
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| 321 | return ptr;
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| 322 | }
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| 323 | }
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| 324 |
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| 325 | void tcg_context_init(TCGContext *s);
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| 326 | void tcg_func_start(TCGContext *s);
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| 327 |
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| 328 | int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf);
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| 329 | int tcg_gen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);
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| 330 |
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| 331 | void tcg_set_frame(TCGContext *s, int reg,
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| 332 | tcg_target_long start, tcg_target_long size);
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| 333 |
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| 334 | TCGv_i32 tcg_global_reg_new_i32(int reg, const char *name);
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| 335 | TCGv_i32 tcg_global_mem_new_i32(int reg, tcg_target_long offset,
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| 336 | const char *name);
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| 337 | TCGv_i32 tcg_temp_new_internal_i32(int temp_local);
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| 338 | static inline TCGv_i32 tcg_temp_new_i32(void)
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| 339 | {
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| 340 | return tcg_temp_new_internal_i32(0);
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| 341 | }
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| 342 | static inline TCGv_i32 tcg_temp_local_new_i32(void)
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| 343 | {
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| 344 | return tcg_temp_new_internal_i32(1);
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| 345 | }
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| 346 | void tcg_temp_free_i32(TCGv_i32 arg);
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| 347 | char *tcg_get_arg_str_i32(TCGContext *s, char *buf, int buf_size, TCGv_i32 arg);
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| 348 |
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| 349 | TCGv_i64 tcg_global_reg_new_i64(int reg, const char *name);
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| 350 | TCGv_i64 tcg_global_mem_new_i64(int reg, tcg_target_long offset,
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| 351 | const char *name);
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| 352 | TCGv_i64 tcg_temp_new_internal_i64(int temp_local);
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| 353 | static inline TCGv_i64 tcg_temp_new_i64(void)
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| 354 | {
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| 355 | return tcg_temp_new_internal_i64(0);
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| 356 | }
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| 357 | static inline TCGv_i64 tcg_temp_local_new_i64(void)
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| 358 | {
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| 359 | return tcg_temp_new_internal_i64(1);
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| 360 | }
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| 361 | void tcg_temp_free_i64(TCGv_i64 arg);
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| 362 | char *tcg_get_arg_str_i64(TCGContext *s, char *buf, int buf_size, TCGv_i64 arg);
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| 363 |
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| 364 | void tcg_dump_info(FILE *f,
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| 365 | int (*cpu_fprintf)(FILE *f, const char *fmt, ...));
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| 366 |
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| 367 | #define TCG_CT_ALIAS 0x80
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| 368 | #define TCG_CT_IALIAS 0x40
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| 369 | #define TCG_CT_REG 0x01
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| 370 | #define TCG_CT_CONST 0x02 /* any constant of register size */
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| 371 |
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| 372 | typedef struct TCGArgConstraint {
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| 373 | uint16_t ct;
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| 374 | uint8_t alias_index;
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| 375 | union {
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| 376 | TCGRegSet regs;
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| 377 | } u;
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| 378 | } TCGArgConstraint;
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| 379 |
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| 380 | #define TCG_MAX_OP_ARGS 16
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| 381 |
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| 382 | #define TCG_OPF_BB_END 0x01 /* instruction defines the end of a basic
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| 383 | block */
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| 384 | #define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers
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| 385 | and potentially update globals. */
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| 386 | #define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it
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| 387 | cannot be removed if its output
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| 388 | are not used */
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| 389 |
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| 390 | typedef struct TCGOpDef {
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| 391 | const char *name;
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| 392 | uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
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| 393 | uint8_t flags;
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| 394 | uint16_t copy_size;
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| 395 | TCGArgConstraint *args_ct;
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| 396 | int *sorted_args;
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| 397 | } TCGOpDef;
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| 398 |
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| 399 | typedef struct TCGTargetOpDef {
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| 400 | int op;
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| 401 | const char *args_ct_str[TCG_MAX_OP_ARGS];
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| 402 | } TCGTargetOpDef;
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| 403 |
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| 404 | void tcg_target_init(TCGContext *s);
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| 405 | void tcg_target_qemu_prologue(TCGContext *s);
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| 406 |
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| 407 | #ifndef VBOX
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| 408 | #define tcg_abort() \
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| 409 | do {\
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| 410 | fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\
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| 411 | abort();\
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| 412 | } while (0)
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| 413 | #else /* VBOX */
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| 414 | # define tcg_abort() \
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| 415 | do {\
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| 416 | remAbort(-1, "TCG fatal error: "__FILE__":" RT_XSTR(__LINE__)); \
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| 417 | } while (0)
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| 418 | extern void qemu_qsort(void* base, size_t nmemb, size_t size,
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| 419 | int(*compar)(const void*, const void*));
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| 420 | #define tcg_exit(status) \
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| 421 | do {\
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| 422 | remAbort(-1, "TCG exit: "__FILE__":" RT_XSTR(__LINE__));\
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| 423 | } while (0)
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| 424 | #endif /* VBOX */
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| 425 |
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| 426 | void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);
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| 427 |
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| 428 | #if TCG_TARGET_REG_BITS == 32
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| 429 | #define tcg_const_ptr tcg_const_i32
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| 430 | #define tcg_add_ptr tcg_add_i32
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| 431 | #define tcg_sub_ptr tcg_sub_i32
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| 432 | #define TCGv_ptr TCGv_i32
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| 433 | #define GET_TCGV_PTR GET_TCGV_I32
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| 434 | #define tcg_global_reg_new_ptr tcg_global_reg_new_i32
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| 435 | #define tcg_global_mem_new_ptr tcg_global_mem_new_i32
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| 436 | #define tcg_temp_new_ptr tcg_temp_new_i32
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| 437 | #define tcg_temp_free_ptr tcg_temp_free_i32
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| 438 | #else
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| 439 | #define tcg_const_ptr tcg_const_i64
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| 440 | #define tcg_add_ptr tcg_add_i64
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| 441 | #define tcg_sub_ptr tcg_sub_i64
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| 442 | #define TCGv_ptr TCGv_i64
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| 443 | #define GET_TCGV_PTR GET_TCGV_I64
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| 444 | #define tcg_global_reg_new_ptr tcg_global_reg_new_i64
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| 445 | #define tcg_global_mem_new_ptr tcg_global_mem_new_i64
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| 446 | #define tcg_temp_new_ptr tcg_temp_new_i64
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| 447 | #define tcg_temp_free_ptr tcg_temp_free_i64
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| 448 | #endif
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| 449 |
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| 450 | void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,
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| 451 | int sizemask, TCGArg ret, int nargs, TCGArg *args);
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| 452 |
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| 453 | void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,
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| 454 | int c, int right, int arith);
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| 455 |
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| 456 | /* only used for debugging purposes */
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| 457 | void tcg_register_helper(void *func, const char *name);
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| 458 | const char *tcg_helper_get_name(TCGContext *s, void *func);
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| 459 | void tcg_dump_ops(TCGContext *s, FILE *outfile);
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| 460 |
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| 461 | void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);
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| 462 | TCGv_i32 tcg_const_i32(int32_t val);
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| 463 | TCGv_i64 tcg_const_i64(int64_t val);
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| 464 | TCGv_i32 tcg_const_local_i32(int32_t val);
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| 465 | TCGv_i64 tcg_const_local_i64(int64_t val);
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| 466 |
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| 467 | void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type,
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| 468 | int label_index, long addend);
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| 469 |
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| 470 | #ifndef VBOX
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| 471 | extern uint8_t code_gen_prologue[];
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| 472 | #else
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| 473 | extern uint8_t *code_gen_prologue;
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| 474 | #endif
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| 475 | #if defined(_ARCH_PPC) && !defined(_ARCH_PPC64)
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| 476 | #define tcg_qemu_tb_exec(tb_ptr) \
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| 477 | ((long REGPARM __attribute__ ((longcall)) (*)(void *))code_gen_prologue)(tb_ptr)
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| 478 | #else
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| 479 | # if defined(VBOX) && defined(GCC_WITH_BUGGY_REGPARM)
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| 480 | # define tcg_qemu_tb_exec(tb_ptr, ret) \
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| 481 | __asm__ __volatile__("call *%%ecx" : "=a"(ret) : "a"(tb_ptr), "c" (&code_gen_prologue[0]) : "memory", "%edx", "cc")
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| 482 | # else /* !VBOX || !GCC_WITH_BUGGY_REG_PARAM */
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| 483 | #define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr)
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| 484 | # endif /* !VBOX || !GCC_WITH_BUGGY_REG_PARAM */
|
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| 485 | #endif
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