1 /*

     2  * 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 #include "tcg-target.h"

    25 

    26 #if TCG_TARGET_REG_BITS == 32

    27 typedef int32_t tcg_target_long;

    28 typedef uint32_t tcg_target_ulong;

    29 #define TCG_PRIlx PRIx32

    30 #define TCG_PRIld PRId32

    31 #elif TCG_TARGET_REG_BITS == 64

    32 typedef int64_t tcg_target_long;

    33 typedef uint64_t tcg_target_ulong;

    34 #define TCG_PRIlx PRIx64

    35 #define TCG_PRIld PRId64

    36 #else

    37 #error unsupported

    38 #endif

    39 

    40 #if TCG_TARGET_NB_REGS <= 32

    41 typedef uint32_t TCGRegSet;

    42 #elif TCG_TARGET_NB_REGS <= 64

    43 typedef uint64_t TCGRegSet;

    44 #else

    45 #error unsupported

    46 #endif

    47 

    48 enum {

    49 #define DEF(s, n, copy_size) INDEX_op_ ## s,

    50 #include "tcg-opc.h"

    51 #undef DEF

    52     NB_OPS,

    53 };

    54 

    55 #define tcg_regset_clear(d) (d) = 0

    56 #define tcg_regset_set(d, s) (d) = (s)

    57 #define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)

    58 #define tcg_regset_set_reg(d, r) (d) |= 1 << (r)

    59 #define tcg_regset_reset_reg(d, r) (d) &= ~(1 << (r))

    60 #define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)

    61 #define tcg_regset_or(d, a, b) (d) = (a) | (b)

    62 #define tcg_regset_and(d, a, b) (d) = (a) & (b)

    63 #define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)

    64 #define tcg_regset_not(d, a) (d) = ~(a)

    65 

    66 typedef struct TCGRelocation {

    67     struct TCGRelocation *next;

    68     int type;

    69     uint8_t *ptr;

    70     tcg_target_long addend;

    71 } TCGRelocation; 

    72 

    73 typedef struct TCGLabel {

    74     int has_value;

    75     union {

    76         tcg_target_ulong value;

    77         TCGRelocation *first_reloc;

    78     } u;

    79 } TCGLabel;

    80 

    81 typedef struct TCGPool {

    82     struct TCGPool *next;

    83     int size;

    84     uint8_t data[0] __attribute__ ((aligned));

    85 } TCGPool;

    86 

    87 #define TCG_POOL_CHUNK_SIZE 32768

    88 

    89 #define TCG_MAX_LABELS 512

    90 

    91 #define TCG_MAX_TEMPS 512

    92 

    93 /* when the size of the arguments of a called function is smaller than

    94    this value, they are statically allocated in the TB stack frame */

    95 #define TCG_STATIC_CALL_ARGS_SIZE 128

    96 

    97 typedef int TCGType;

    98 

    99 #define TCG_TYPE_I32 0

   100 #define TCG_TYPE_I64 1

   101 #define TCG_TYPE_COUNT 2 /* number of different types */

   102 

   103 #if TCG_TARGET_REG_BITS == 32

   104 #define TCG_TYPE_PTR TCG_TYPE_I32

   105 #else

   106 #define TCG_TYPE_PTR TCG_TYPE_I64

   107 #endif

   108 

   109 typedef tcg_target_ulong TCGArg;

   110 

   111 /* Define a type and accessor macros for varables.  Using a struct is

   112    nice because it gives some level of type safely.  Ideally the compiler

   113    be able to see through all this.  However in practice this is not true,

   114    expecially on targets with braindamaged ABIs (e.g. i386).

   115    We use plain int by default to avoid this runtime overhead.

   116    Users of tcg_gen_* don't need to know about any of this, and should

   117    treat TCGv as an opaque type.

   118    In additon we do typechecking for different types of variables.  TCGv_i32

   119    and TCGv_i64 are 32/64-bit variables respectively.  TCGv and TCGv_ptr

   120    are aliases for target_ulong and host pointer sized values respectively.

   121  */

   122 

   123 //#define DEBUG_TCGV 1

   124 

   125 #ifdef DEBUG_TCGV

   126 

   127 typedef struct

   128 {

   129     int i32;

   130 } TCGv_i32;

   131 

   132 typedef struct

   133 {

   134     int i64;

   135 } TCGv_i64;

   136 

   137 #define MAKE_TCGV_I32(i) __extension__                  \

   138     ({ TCGv_i32 make_tcgv_tmp = {i}; make_tcgv_tmp;})

   139 #define MAKE_TCGV_I64(i) __extension__                  \

   140     ({ TCGv_i64 make_tcgv_tmp = {i}; make_tcgv_tmp;})

   141 #define GET_TCGV_I32(t) ((t).i32)

   142 #define GET_TCGV_I64(t) ((t).i64)

   143 #if TCG_TARGET_REG_BITS == 32

   144 #define TCGV_LOW(t) MAKE_TCGV_I32(GET_TCGV_I64(t))

   145 #define TCGV_HIGH(t) MAKE_TCGV_I32(GET_TCGV_I64(t) + 1)

   146 #endif

   147 

   148 #else /* !DEBUG_TCGV */

   149 

   150 typedef int TCGv_i32;

   151 typedef int TCGv_i64;

   152 #define MAKE_TCGV_I32(x) (x)

   153 #define MAKE_TCGV_I64(x) (x)

   154 #define GET_TCGV_I32(t) (t)

   155 #define GET_TCGV_I64(t) (t)

   156 #if TCG_TARGET_REG_BITS == 32

   157 #define TCGV_LOW(t) (t)

   158 #define TCGV_HIGH(t) ((t) + 1)

   159 #endif

   160 

   161 #endif /* DEBUG_TCGV */

   162 

   163 /* Dummy definition to avoid compiler warnings.  */

   164 #define TCGV_UNUSED_I32(x) x = MAKE_TCGV_I32(-1)

   165 #define TCGV_UNUSED_I64(x) x = MAKE_TCGV_I64(-1)

   166 

   167 /* call flags */

   168 #define TCG_CALL_TYPE_MASK      0x000f

   169 #define TCG_CALL_TYPE_STD       0x0000 /* standard C call */

   170 #define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */

   171 #define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */

   172 #define TCG_CALL_TYPE_REGPARM   0x0003 /* i386 style regparm call (3 regs) */

   173 /* A pure function only reads its arguments and globals variables and

   174    cannot raise exceptions. Hence a call to a pure function can be

   175    safely suppressed if the return value is not used. */

   176 #define TCG_CALL_PURE           0x0010 

   177 

   178 /* used to align parameters */

   179 #define TCG_CALL_DUMMY_TCGV     MAKE_TCGV_I32(-1)

   180 #define TCG_CALL_DUMMY_ARG      ((TCGArg)(-1))

   181 

   182 typedef enum {

   183     TCG_COND_EQ,

   184     TCG_COND_NE,

   185     TCG_COND_LT,

   186     TCG_COND_GE,

   187     TCG_COND_LE,

   188     TCG_COND_GT,

   189     /* unsigned */

   190     TCG_COND_LTU,

   191     TCG_COND_GEU,

   192     TCG_COND_LEU,

   193     TCG_COND_GTU,

   194 } TCGCond;

   195 

   196 #define TEMP_VAL_DEAD  0

   197 #define TEMP_VAL_REG   1

   198 #define TEMP_VAL_MEM   2

   199 #define TEMP_VAL_CONST 3

   200 

   201 /* XXX: optimize memory layout */

   202 typedef struct TCGTemp {

   203     TCGType base_type;

   204     TCGType type;

   205     int val_type;

   206     int reg;

   207     tcg_target_long val;

   208     int mem_reg;

   209     tcg_target_long mem_offset;

   210     unsigned int fixed_reg:1;

   211     unsigned int mem_coherent:1;

   212     unsigned int mem_allocated:1;

   213     unsigned int temp_local:1; /* If true, the temp is saved accross

   214                                   basic blocks. Otherwise, it is not

   215                                   preserved accross basic blocks. */

   216     unsigned int temp_allocated:1; /* never used for code gen */

   217     /* index of next free temp of same base type, -1 if end */

   218     int next_free_temp;

   219     const char *name;

   220 } TCGTemp;

   221 

   222 typedef struct TCGHelperInfo {

   223     tcg_target_ulong func;

   224     const char *name;

   225 } TCGHelperInfo;

   226 

   227 typedef struct TCGContext TCGContext;

   228 

   229 struct TCGContext {

   230     uint8_t *pool_cur, *pool_end;

   231     TCGPool *pool_first, *pool_current;

   232     TCGLabel *labels;

   233     int nb_labels;

   234     TCGTemp *temps; /* globals first, temps after */

   235     int nb_globals;

   236     int nb_temps;

   237     /* index of free temps, -1 if none */

   238     int first_free_temp[TCG_TYPE_COUNT * 2]; 

   239 

   240     /* goto_tb support */

   241     uint8_t *code_buf;

   242     unsigned long *tb_next;

   243     uint16_t *tb_next_offset;

   244     uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */

   245 

   246     /* liveness analysis */

   247     uint16_t *op_dead_iargs; /* for each operation, each bit tells if the

   248                                 corresponding input argument is dead */

   249     

   250     /* tells in which temporary a given register is. It does not take

   251        into account fixed registers */

   252     int reg_to_temp[TCG_TARGET_NB_REGS];

   253     TCGRegSet reserved_regs;

   254     tcg_target_long current_frame_offset;

   255     tcg_target_long frame_start;

   256     tcg_target_long frame_end;

   257     int frame_reg;

   258 

   259     uint8_t *code_ptr;

   260     TCGTemp static_temps[TCG_MAX_TEMPS];

   261 

   262     TCGHelperInfo *helpers;

   263     int nb_helpers;

   264     int allocated_helpers;

   265     int helpers_sorted;

   266 

   267 #ifdef CONFIG_PROFILER

   268     /* profiling info */

   269     int64_t tb_count1;

   270     int64_t tb_count;

   271     int64_t op_count; /* total insn count */

   272     int op_count_max; /* max insn per TB */

   273     int64_t temp_count;

   274     int temp_count_max;

   275     int64_t old_op_count;

   276     int64_t del_op_count;

   277     int64_t code_in_len;

   278     int64_t code_out_len;

   279     int64_t interm_time;

   280     int64_t code_time;

   281     int64_t la_time;

   282     int64_t restore_count;

   283     int64_t restore_time;

   284 #endif

   285 };

   286 

   287 extern TCGContext tcg_ctx;

   288 extern uint16_t *gen_opc_ptr;

   289 extern TCGArg *gen_opparam_ptr;

   290 extern uint16_t gen_opc_buf[];

   291 extern TCGArg gen_opparam_buf[];

   292 

   293 /* pool based memory allocation */

   294 

   295 void *tcg_malloc_internal(TCGContext *s, int size);

   296 void tcg_pool_reset(TCGContext *s);

   297 void tcg_pool_delete(TCGContext *s);

   298 

   299 static inline void *tcg_malloc(int size)

   300 {

   301     TCGContext *s = &tcg_ctx;

   302     uint8_t *ptr, *ptr_end;

   303     size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);

   304     ptr = s->pool_cur;

   305     ptr_end = ptr + size;

   306     if (unlikely(ptr_end > s->pool_end)) {

   307         return tcg_malloc_internal(&tcg_ctx, size);

   308     } else {

   309         s->pool_cur = ptr_end;

   310         return ptr;

   311     }

   312 }

   313 

   314 void tcg_context_init(TCGContext *s);

   315 void tcg_func_start(TCGContext *s);

   316 

   317 int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf);

   318 int tcg_gen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf, long offset);

   319 

   320 void tcg_set_frame(TCGContext *s, int reg,

   321                    tcg_target_long start, tcg_target_long size);

   322 TCGv_i64 tcg_global_reg2_new_hack(TCGType type, int reg1, int reg2,

   323                                   const char *name);

   324 

   325 TCGv_i32 tcg_global_reg_new_i32(int reg, const char *name);

   326 TCGv_i32 tcg_global_mem_new_i32(int reg, tcg_target_long offset,

   327                                 const char *name);

   328 TCGv_i32 tcg_temp_new_internal_i32(int temp_local);

   329 static inline TCGv_i32 tcg_temp_new_i32(void)

   330 {

   331     return tcg_temp_new_internal_i32(0);

   332 }

   333 static inline TCGv_i32 tcg_temp_local_new_i32(void)

   334 {

   335     return tcg_temp_new_internal_i32(1);

   336 }

   337 void tcg_temp_free_i32(TCGv_i32 arg);

   338 char *tcg_get_arg_str_i32(TCGContext *s, char *buf, int buf_size, TCGv_i32 arg);

   339 

   340 TCGv_i64 tcg_global_reg_new_i64(int reg, const char *name);

   341 TCGv_i64 tcg_global_mem_new_i64(int reg, tcg_target_long offset,

   342                                 const char *name);

   343 TCGv_i64 tcg_temp_new_internal_i64(int temp_local);

   344 static inline TCGv_i64 tcg_temp_new_i64(void)

   345 {

   346     return tcg_temp_new_internal_i64(0);

   347 }

   348 static inline TCGv_i64 tcg_temp_local_new_i64(void)

   349 {

   350     return tcg_temp_new_internal_i64(1);

   351 }

   352 void tcg_temp_free_i64(TCGv_i64 arg);

   353 char *tcg_get_arg_str_i64(TCGContext *s, char *buf, int buf_size, TCGv_i64 arg);

   354 

   355 void tcg_dump_info(FILE *f,

   356                    int (*cpu_fprintf)(FILE *f, const char *fmt, ...));

   357 

   358 #define TCG_CT_ALIAS  0x80

   359 #define TCG_CT_IALIAS 0x40

   360 #define TCG_CT_REG    0x01

   361 #define TCG_CT_CONST  0x02 /* any constant of register size */

   362 

   363 typedef struct TCGArgConstraint {

   364     uint16_t ct;

   365     uint8_t alias_index;

   366     union {

   367         TCGRegSet regs;

   368     } u;

   369 } TCGArgConstraint;

   370 

   371 #define TCG_MAX_OP_ARGS 16

   372 

   373 #define TCG_OPF_BB_END     0x01 /* instruction defines the end of a basic

   374                                    block */

   375 #define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers 

   376                                    and potentially update globals. */

   377 #define TCG_OPF_SIDE_EFFECTS 0x04 /* instruction has side effects : it

   378                                      cannot be removed if its output

   379                                      are not used */

   380 

   381 typedef struct TCGOpDef {

   382     const char *name;

   383     uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;

   384     uint8_t flags;

   385     uint16_t copy_size;

   386     TCGArgConstraint *args_ct;

   387     int *sorted_args;

   388 } TCGOpDef;

   389         

   390 typedef struct TCGTargetOpDef {

   391     int op;

   392     const char *args_ct_str[TCG_MAX_OP_ARGS];

   393 } TCGTargetOpDef;

   394 

   395 extern TCGOpDef tcg_op_defs[];

   396 

   397 void tcg_target_init(TCGContext *s);

   398 void tcg_target_qemu_prologue(TCGContext *s);

   399 

   400 #define tcg_abort() \

   401 do {\

   402     fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\

   403     abort();\

   404 } while (0)

   405 

   406 void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);

   407 

   408 #if TCG_TARGET_REG_BITS == 32

   409 #define tcg_const_ptr tcg_const_i32

   410 #define tcg_add_ptr tcg_add_i32

   411 #define tcg_sub_ptr tcg_sub_i32

   412 #define TCGv_ptr TCGv_i32

   413 #define GET_TCGV_PTR GET_TCGV_I32

   414 #define tcg_global_reg_new_ptr tcg_global_reg_new_i32

   415 #define tcg_global_mem_new_ptr tcg_global_mem_new_i32

   416 #define tcg_temp_new_ptr tcg_temp_new_i32

   417 #define tcg_temp_free_ptr tcg_temp_free_i32

   418 #else

   419 #define tcg_const_ptr tcg_const_i64

   420 #define tcg_add_ptr tcg_add_i64

   421 #define tcg_sub_ptr tcg_sub_i64

   422 #define TCGv_ptr TCGv_i64

   423 #define GET_TCGV_PTR GET_TCGV_I64

   424 #define tcg_global_reg_new_ptr tcg_global_reg_new_i64

   425 #define tcg_global_mem_new_ptr tcg_global_mem_new_i64

   426 #define tcg_temp_new_ptr tcg_temp_new_i64

   427 #define tcg_temp_free_ptr tcg_temp_free_i64

   428 #endif

   429 

   430 void tcg_gen_callN(TCGContext *s, TCGv_ptr func, unsigned int flags,

   431                    int sizemask, TCGArg ret, int nargs, TCGArg *args);

   432 

   433 void tcg_gen_shifti_i64(TCGv_i64 ret, TCGv_i64 arg1,

   434                         int c, int right, int arith);

   435 

   436 /* only used for debugging purposes */

   437 void tcg_register_helper(void *func, const char *name);

   438 const char *tcg_helper_get_name(TCGContext *s, void *func);

   439 void tcg_dump_ops(TCGContext *s, FILE *outfile);

   440 

   441 void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);

   442 TCGv_i32 tcg_const_i32(int32_t val);

   443 TCGv_i64 tcg_const_i64(int64_t val);

   444 TCGv_i32 tcg_const_local_i32(int32_t val);

   445 TCGv_i64 tcg_const_local_i64(int64_t val);

   446 

   447 void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type, 

   448                    int label_index, long addend);

   449 const TCGArg *tcg_gen_code_op(TCGContext *s, int opc, const TCGArg *args1,

   450                               unsigned int dead_iargs);

   451 

   452 /* tcg-runtime.c */

   453 int64_t tcg_helper_shl_i64(int64_t arg1, int64_t arg2);

   454 int64_t tcg_helper_shr_i64(int64_t arg1, int64_t arg2);

   455 int64_t tcg_helper_sar_i64(int64_t arg1, int64_t arg2);

   456 int64_t tcg_helper_div_i64(int64_t arg1, int64_t arg2);

   457 int64_t tcg_helper_rem_i64(int64_t arg1, int64_t arg2);

   458 uint64_t tcg_helper_divu_i64(uint64_t arg1, uint64_t arg2);

   459 uint64_t tcg_helper_remu_i64(uint64_t arg1, uint64_t arg2);

   460 

   461 extern uint8_t code_gen_prologue[];

   462 #if defined(__powerpc__) && !defined(__powerpc64__)

   463 #define tcg_qemu_tb_exec(tb_ptr) \

   464     ((long REGPARM __attribute__ ((longcall)) (*)(void *))code_gen_prologue)(tb_ptr)

   465 #else

   466 #define tcg_qemu_tb_exec(tb_ptr) ((long REGPARM (*)(void *))code_gen_prologue)(tb_ptr)

   467 #endif