mono/mini/mini-arm.h

   1 /*
   2  * Copyright 2011 Xamarin Inc
   3  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   4  */
   5
   6 #ifndef __MONO_MINI_ARM_H__
   7 #define __MONO_MINI_ARM_H__
   8
   9 #include <mono/arch/arm/arm-codegen.h>
  10 #include <mono/utils/mono-context.h>
  11 #include <glib.h>
  12
  13 #if defined(ARM_FPU_NONE)
  14 #define MONO_ARCH_SOFT_FLOAT_FALLBACK 1
  15 #endif
  16
  17 #if defined(__ARM_EABI__)
  18 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  19 #define ARM_ARCHITECTURE "armel"
  20 #else
  21 #define ARM_ARCHITECTURE "armeb"
  22 #endif
  23 #else
  24 #define ARM_ARCHITECTURE "arm"
  25 #endif
  26
  27 #if defined(ARM_FPU_VFP)
  28 #define ARM_FP_MODEL "vfp"
  29 #elif defined(ARM_FPU_NONE)
  30 #define ARM_FP_MODEL "vfp+fallback"
  31 #elif defined(ARM_FPU_VFP_HARD)
  32 #define ARM_FP_MODEL "vfp+hard"
  33 #else
  34 #error "At least one of ARM_FPU_NONE, ARM_FPU_VFP or ARM_FPU_VFP_HARD must be defined."
  35 #endif
  36
  37 #define MONO_ARCH_ARCHITECTURE ARM_ARCHITECTURE "," ARM_FP_MODEL
  38
  39 #define MONO_ARCH_CPU_SPEC mono_arm_cpu_desc
  40
  41 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
  42 #define ARM_LSW_REG ARMREG_R0
  43 #define ARM_MSW_REG ARMREG_R1
  44 #else
  45 #define ARM_LSW_REG ARMREG_R1
  46 #define ARM_MSW_REG ARMREG_R0
  47 #endif
  48
  49 #define MONO_MAX_IREGS 16
  50
  51 #define MONO_SAVED_GREGS 10 /* r4-r11, ip, lr */
  52
  53 /* r4-r11, ip, lr: registers saved in the LMF  */
  54 #define MONO_ARM_REGSAVE_MASK 0x5ff0
  55 #define MONO_ARM_FIRST_SAVED_REG ARMREG_R4
  56 #define MONO_ARM_NUM_SAVED_REGS 10
  57
  58 /* Parameters used by the register allocator */
  59
  60 #define MONO_ARCH_CALLEE_REGS ((1<<ARMREG_R0) | (1<<ARMREG_R1) | (1<<ARMREG_R2) | (1<<ARMREG_R3) | (1<<ARMREG_IP))
  61 #define MONO_ARCH_CALLEE_SAVED_REGS ((1<<ARMREG_V1) | (1<<ARMREG_V2) | (1<<ARMREG_V3) | (1<<ARMREG_V4) | (1<<ARMREG_V5) | (1<<ARMREG_V6) | (1<<ARMREG_V7))
  62
  63 /*
  64  * TODO: Make use of VFP v3 registers d16-d31.
  65  */
  66
  67 /*
  68  * TODO: We can't use registers d8-d15 in hard float mode because the
  69  * register allocator doesn't allocate floating point registers globally.
  70  */
  71
  72 #if defined(ARM_FPU_VFP_HARD)
  73 #define MONO_SAVED_FREGS 16
  74 #define MONO_MAX_FREGS 32
  75
  76 /*
  77  * d8-d15 must be preserved across function calls. We use d14-d15 as
  78  * scratch registers in the JIT. The rest have no meaning tied to them.
  79  */
  80 #define MONO_ARCH_CALLEE_FREGS 0x00005555
  81 #define MONO_ARCH_CALLEE_SAVED_FREGS 0x55550000
  82 #else
  83 #define MONO_SAVED_FREGS 8
  84 #define MONO_MAX_FREGS 16
  85
  86 /*
  87  * No registers need to be preserved across function calls. We use d0-d1
  88  * as scratch registers in the JIT. The rest have no meaning tied to them.
  89  */
  90 #define MONO_ARCH_CALLEE_FREGS 0x55555550
  91 #define MONO_ARCH_CALLEE_SAVED_FREGS 0x00000000
  92 #endif
  93
  94 #define MONO_ARCH_USE_FPSTACK FALSE
  95 #define MONO_ARCH_FPSTACK_SIZE 0
  96
  97 #define MONO_ARCH_INST_SREG2_MASK(ins) (0)
  98
  99 #define MONO_ARCH_INST_FIXED_REG(desc) \
 100         (mono_arch_is_soft_float () ? \
 101         ((desc) == 'l' || (desc) == 'f' || (desc) == 'g' ? ARM_LSW_REG : (desc) == 'a' ? ARMREG_R0 : -1) : \
 102         ((desc) == 'l' ? ARM_LSW_REG : (desc) == 'a' ? ARMREG_R0 : -1))
 103
 104 #define MONO_ARCH_INST_IS_REGPAIR(desc) \
 105         (mono_arch_is_soft_float () ? \
 106         ((desc) == 'l' || (desc) == 'L' || (desc) == 'f' || (desc) == 'g') : \
 107         ((desc) == 'l' || (desc) == 'L'))
 108
 109 #define MONO_ARCH_INST_IS_FLOAT(desc) \
 110         (mono_arch_is_soft_float () ? \
 111         (FALSE) : \
 112         ((desc) == 'f' || (desc) == 'g'))
 113
 114 #define MONO_ARCH_INST_REGPAIR_REG2(desc,hreg1) ((desc) == 'l' || (desc) == 'f' || (desc) == 'g' ? ARM_MSW_REG : -1)
 115
 116 #ifdef TARGET_WATCHOS
 117 #define MONO_ARCH_FRAME_ALIGNMENT 16
 118 #else
 119 #define MONO_ARCH_FRAME_ALIGNMENT 8
 120 #endif
 121
 122 /* fixme: align to 16byte instead of 32byte (we align to 32byte to get
 123  * reproduceable results for benchmarks */
 124 #define MONO_ARCH_CODE_ALIGNMENT 32
 125
 126 /* This needs to hold both a 32 bit int and a 64 bit double */
 127 #define mono_unwind_reg_t guint64
 128
 129 /* Argument marshallings for calls between gsharedvt and normal code */
 130 typedef enum {
 131         GSHAREDVT_ARG_NONE = 0,
 132         GSHAREDVT_ARG_BYVAL_TO_BYREF = 1,
 133         GSHAREDVT_ARG_BYREF_TO_BYVAL = 2,
 134         GSHAREDVT_ARG_BYREF_TO_BYVAL_I1 = 3,
 135         GSHAREDVT_ARG_BYREF_TO_BYVAL_I2 = 4,
 136         GSHAREDVT_ARG_BYREF_TO_BYVAL_U1 = 5,
 137         GSHAREDVT_ARG_BYREF_TO_BYVAL_U2 = 6
 138 } GSharedVtArgMarshal;
 139
 140 /* Return value marshalling for calls between gsharedvt and normal code */
 141 typedef enum {
 142         GSHAREDVT_RET_NONE = 0,
 143         GSHAREDVT_RET_IREG = 1,
 144         GSHAREDVT_RET_IREGS = 2,
 145         GSHAREDVT_RET_I1 = 3,
 146         GSHAREDVT_RET_U1 = 4,
 147         GSHAREDVT_RET_I2 = 5,
 148         GSHAREDVT_RET_U2 = 6,
 149         GSHAREDVT_RET_VFP_R4 = 7,
 150         GSHAREDVT_RET_VFP_R8 = 8
 151 } GSharedVtRetMarshal;
 152
 153 typedef struct {
 154         /* Method address to call */
 155         gpointer addr;
 156         /* The trampoline reads this, so keep the size explicit */
 157         int ret_marshal;
 158         /* If ret_marshal != NONE, this is the reg of the vret arg, else -1 */
 159         int vret_arg_reg;
 160         /* The stack slot where the return value will be stored */
 161         int vret_slot;
 162         int stack_usage, map_count;
 163         /* If not -1, then make a virtual call using this vtable offset */
 164         int vcall_offset;
 165         /* If 1, make an indirect call to the address in the rgctx reg */
 166         int calli;
 167         /* Whenever this is a in or an out call */
 168         int gsharedvt_in;
 169         /* Whenever this call uses fp registers */
 170         int have_fregs;
 171         gpointer caller_cinfo, callee_cinfo;
 172         /* Maps stack slots/registers in the caller to the stack slots/registers in the callee */
 173         /* A negative value means a register, i.e. -1=r0, -2=r1 etc. */
 174         int map [MONO_ZERO_LEN_ARRAY];
 175 } GSharedVtCallInfo;
 176
 177
 178 typedef enum {
 179         RegTypeNone,
 180         /* Passed/returned in an ireg */
 181         RegTypeGeneral,
 182         /* Passed/returned in a pair of iregs */
 183         RegTypeIRegPair,
 184         /* Passed on the stack */
 185         RegTypeBase,
 186         /* First word in r3, second word on the stack */
 187         RegTypeBaseGen,
 188         /* FP value passed in either an ireg or a vfp reg */
 189         RegTypeFP,
 190         /* Struct passed/returned in gregs */
 191         RegTypeStructByVal,
 192         RegTypeStructByAddr,
 193         RegTypeStructByAddrOnStack,
 194         /* gsharedvt argument passed by addr in greg */
 195         RegTypeGSharedVtInReg,
 196         /* gsharedvt argument passed by addr on stack */
 197         RegTypeGSharedVtOnStack,
 198         RegTypeHFA
 199 } ArgStorage;
 200
 201 typedef struct {
 202         gint32  offset;
 203         guint16 vtsize; /* in param area */
 204         /* RegTypeHFA */
 205         int esize;
 206         /* RegTypeHFA/RegTypeStructByVal */
 207         int nregs;
 208         guint8  reg;
 209         ArgStorage  storage;
 210         /* RegTypeStructByVal */
 211         gint32  struct_size;
 212         guint8  size    : 4; /* 1, 2, 4, 8, or regs used by RegTypeStructByVal */
 213 } ArgInfo;
 214
 215 typedef struct {
 216         int nargs;
 217         guint32 stack_usage;
 218         /* The index of the vret arg in the argument list for RegTypeStructByAddr */
 219         int vret_arg_index;
 220         ArgInfo ret;
 221         ArgInfo sig_cookie;
 222         ArgInfo args [1];
 223 } CallInfo;
 224
 225 /* Structure used by the sequence points in AOTed code */
 226 typedef struct {
 227         gpointer ss_trigger_page;
 228         gpointer bp_trigger_page;
 229         gpointer ss_tramp_addr;
 230         guint8* bp_addrs [MONO_ZERO_LEN_ARRAY];
 231 } SeqPointInfo;
 232
 233
 234 #define PARAM_REGS 4
 235 #define FP_PARAM_REGS 8
 236 #define DYN_CALL_STACK_ARGS 10
 237
 238 typedef struct {
 239         mgreg_t regs [PARAM_REGS + FP_PARAM_REGS];
 240         double fpregs [FP_PARAM_REGS];
 241         mgreg_t res, res2;
 242         guint8 *ret;
 243         guint32 has_fpregs;
 244 } DynCallArgs;
 245
 246 void arm_patch (guchar *code, const guchar *target);
 247 guint8* mono_arm_emit_load_imm (guint8 *code, int dreg, guint32 val);
 248 int mono_arm_is_rotated_imm8 (guint32 val, gint *rot_amount);
 249
 250 void
 251 mono_arm_throw_exception_by_token (guint32 type_token, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
 252
 253 gpointer
 254 mono_arm_start_gsharedvt_call (GSharedVtCallInfo *info, gpointer *caller, gpointer *callee, gpointer mrgctx_reg, double *caller_fregs, double *callee_fregs);
 255
 256 typedef enum {
 257         MONO_ARM_FPU_NONE = 0,
 258         MONO_ARM_FPU_VFP = 1,
 259         MONO_ARM_FPU_VFP_HARD = 2
 260 } MonoArmFPU;
 261
 262 /* keep the size of the structure a multiple of 8 */
 263 struct MonoLMF {
 264         /*
 265          * If the second lowest bit is set to 1, then this is a MonoLMFExt structure, and
 266          * the other fields are not valid.
 267          */
 268         gpointer    previous_lmf;
 269         gpointer    lmf_addr;
 270         /* This is only set in trampoline LMF frames */
 271         MonoMethod *method;
 272         mgreg_t    sp;
 273         mgreg_t    ip;
 274         mgreg_t    fp;
 275         /* Currently only used in trampolines on armhf to hold d0-d15. We don't really
 276          * need to put d0-d7 in the LMF, but it simplifies the trampoline code.
 277          */
 278         double     fregs [16];
 279         /* all but sp and pc: matches the PUSH instruction layout in the trampolines
 280          * 0-4 should be considered undefined (execpt in the magic tramp)
 281          * sp is saved at IP.
 282          */
 283         mgreg_t    iregs [14];
 284 };
 285
 286 typedef struct MonoCompileArch {
 287         gpointer seq_point_info_var, ss_trigger_page_var;
 288         gpointer seq_point_ss_method_var;
 289         gpointer seq_point_bp_method_var;
 290         gpointer vret_addr_loc;
 291         gboolean omit_fp, omit_fp_computed;
 292         gpointer cinfo;
 293         gpointer *vfp_scratch_slots [2];
 294         int atomic_tmp_offset;
 295         guint8 *thunks;
 296         int thunks_size;
 297 } MonoCompileArch;
 298
 299 #define MONO_ARCH_EMULATE_FCONV_TO_I8 1
 300 #define MONO_ARCH_EMULATE_LCONV_TO_R8 1
 301 #define MONO_ARCH_EMULATE_LCONV_TO_R4 1
 302 #define MONO_ARCH_EMULATE_LCONV_TO_R8_UN 1
 303 #define MONO_ARCH_EMULATE_FREM 1
 304 #define MONO_ARCH_EMULATE_DIV 1
 305 #define MONO_ARCH_EMULATE_CONV_R8_UN 1
 306 #define MONO_ARCH_EMULATE_MUL_OVF 1
 307
 308 #define ARM_FIRST_ARG_REG 0
 309 #define ARM_LAST_ARG_REG 3
 310
 311 #define MONO_ARCH_USE_SIGACTION 1
 312
 313 #if defined(HOST_WATCHOS)
 314 #undef MONO_ARCH_USE_SIGACTION
 315 #endif
 316
 317 #define MONO_ARCH_NEED_DIV_CHECK 1
 318
 319 #define MONO_ARCH_HAVE_GENERALIZED_IMT_TRAMPOLINE 1
 320
 321 #define MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES 1
 322 #define MONO_ARCH_HAVE_DECOMPOSE_LONG_OPTS 1
 323
 324 #define MONO_ARCH_AOT_SUPPORTED 1
 325 #define MONO_ARCH_LLVM_SUPPORTED 1
 326
 327 #define MONO_ARCH_GSHARED_SUPPORTED 1
 328 #define MONO_ARCH_DYN_CALL_SUPPORTED 1
 329 #define MONO_ARCH_DYN_CALL_PARAM_AREA (DYN_CALL_STACK_ARGS * sizeof (mgreg_t))
 330
 331 #ifndef MONO_CROSS_COMPILE
 332 #define MONO_ARCH_SOFT_DEBUG_SUPPORTED 1
 333 #endif
 334
 335 #define MONO_ARCH_HAVE_EXCEPTIONS_INIT 1
 336 #define MONO_ARCH_HAVE_GET_TRAMPOLINES 1
 337 #define MONO_ARCH_HAVE_CONTEXT_SET_INT_REG 1
 338 #define MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX 1
 339 #define MONO_ARCH_GC_MAPS_SUPPORTED 1
 340 #define MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK 1
 341 #define MONO_ARCH_HAVE_CONTEXT_SET_INT_REG 1
 342 #define MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD 1
 343 #define MONO_ARCH_HAVE_SETUP_RESUME_FROM_SIGNAL_HANDLER_CTX 1
 344 #define MONO_ARCH_GSHAREDVT_SUPPORTED 1
 345 #define MONO_ARCH_HAVE_GENERAL_RGCTX_LAZY_FETCH_TRAMPOLINE 1
 346 #define MONO_ARCH_HAVE_OPCODE_NEEDS_EMULATION 1
 347 #define MONO_ARCH_HAVE_OBJC_GET_SELECTOR 1
 348 #define MONO_ARCH_HAVE_OP_TAIL_CALL 1
 349 #define MONO_ARCH_HAVE_DUMMY_INIT 1
 350 #define MONO_ARCH_HAVE_SDB_TRAMPOLINES 1
 351 #define MONO_ARCH_HAVE_PATCH_CODE_NEW 1
 352 #define MONO_ARCH_HAVE_OP_GENERIC_CLASS_INIT 1
 353 #define MONO_ARCH_HAVE_GET_TLS_TRAMP 1
 354
 355 #define MONO_ARCH_HAVE_TLS_GET (mono_arm_have_tls_get ())
 356 #define MONO_ARCH_HAVE_TLS_GET_REG 1
 357
 358 #ifdef TARGET_WATCHOS
 359 #define MONO_ARCH_DISABLE_HW_TRAPS 1
 360 #define MONO_ARCH_HAVE_UNWIND_BACKTRACE 1
 361 #endif
 362
 363 /* ARM doesn't have too many registers, so we have to use a callee saved one */
 364 #define MONO_ARCH_RGCTX_REG ARMREG_V5
 365 #define MONO_ARCH_IMT_REG MONO_ARCH_RGCTX_REG
 366 /* First argument reg */
 367 #define MONO_ARCH_VTABLE_REG ARMREG_R0
 368 #define MONO_ARCH_EXC_REG ARMREG_R0
 369
 370 #define MONO_CONTEXT_SET_LLVM_EXC_REG(ctx, exc) do { (ctx)->regs [0] = (gsize)exc; } while (0)
 371
 372 #define MONO_INIT_CONTEXT_FROM_FUNC(ctx,func) do {      \
 373                 MONO_CONTEXT_SET_BP ((ctx), __builtin_frame_address (0));       \
 374                 MONO_CONTEXT_SET_SP ((ctx), __builtin_frame_address (0));       \
 375                 MONO_CONTEXT_SET_IP ((ctx), (func));    \
 376         } while (0)
 377
 378 #define MONO_ARCH_INIT_TOP_LMF_ENTRY(lmf)
 379
 380 void
 381 mono_arm_throw_exception (MonoObject *exc, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
 382
 383 void
 384 mono_arm_throw_exception_by_token (guint32 type_token, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
 385
 386 void
 387 mono_arm_resume_unwind (guint32 dummy1, mgreg_t pc, mgreg_t sp, mgreg_t *int_regs, gdouble *fp_regs);
 388
 389 gboolean
 390 mono_arm_thumb_supported (void);
 391
 392 GSList*
 393 mono_arm_get_exception_trampolines (gboolean aot);
 394
 395 guint8*
 396 mono_arm_get_thumb_plt_entry (guint8 *code);
 397
 398 guint8*
 399 mono_arm_patchable_b (guint8 *code, int cond);
 400
 401 guint8*
 402 mono_arm_patchable_bl (guint8 *code, int cond);
 403
 404 gboolean
 405 mono_arm_is_hard_float (void);
 406
 407 gboolean
 408 mono_arm_have_tls_get (void);
 409
 410 void
 411 mono_arm_unaligned_stack (MonoMethod *method);
 412
 413 CallInfo*
 414 mono_arch_get_call_info (MonoMemPool *mp, MonoMethodSignature *sig);
 415
 416 #endif /* __MONO_MINI_ARM_H__ */