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tcg.h
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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef TCG_H
#define TCG_H
#include "cpu.h"
#include "exec/memop.h"
#include "exec/tb-context.h"
#include "qemu/bitops.h"
#include "qemu/plugin.h"
#include "qemu/queue.h"
#include "tcg-mo.h"
#include "tcg-target.h"
#include "qemu/int128.h"
/* XXX: make safe guess about sizes */
#define MAX_OP_PER_INSTR 266
#if HOST_LONG_BITS == 32
#define MAX_OPC_PARAM_PER_ARG 2
#else
#define MAX_OPC_PARAM_PER_ARG 1
#endif
#define MAX_OPC_PARAM_IARGS 6
#define MAX_OPC_PARAM_OARGS 1
#define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS)
/* A Call op needs up to 4 + 2N parameters on 32-bit archs,
* and up to 4 + N parameters on 64-bit archs
* (N = number of input arguments + output arguments). */
#define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS))
#define CPU_TEMP_BUF_NLONGS 128
/* Default target word size to pointer size. */
#ifndef TCG_TARGET_REG_BITS
# if UINTPTR_MAX == UINT32_MAX
# define TCG_TARGET_REG_BITS 32
# elif UINTPTR_MAX == UINT64_MAX
# define TCG_TARGET_REG_BITS 64
# else
# error Unknown pointer size for tcg target
# endif
#endif
#if TCG_TARGET_REG_BITS == 32
typedef int32_t tcg_target_long;
typedef uint32_t tcg_target_ulong;
#define TCG_PRIlx PRIx32
#define TCG_PRIld PRId32
#elif TCG_TARGET_REG_BITS == 64
typedef int64_t tcg_target_long;
typedef uint64_t tcg_target_ulong;
#define TCG_PRIlx PRIx64
#define TCG_PRIld PRId64
#else
#error unsupported
#endif
/* Oversized TCG guests make things like MTTCG hard
* as we can't use atomics for cputlb updates.
*/
#if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
#define TCG_OVERSIZED_GUEST 1
#else
#define TCG_OVERSIZED_GUEST 0
#endif
#if TCG_TARGET_NB_REGS <= 32
typedef uint32_t TCGRegSet;
#elif TCG_TARGET_NB_REGS <= 64
typedef uint64_t TCGRegSet;
#else
#error unsupported
#endif
#if TCG_TARGET_REG_BITS == 32
/* Turn some undef macros into false macros. */
#define TCG_TARGET_HAS_extrl_i64_i32 0
#define TCG_TARGET_HAS_extrh_i64_i32 0
#define TCG_TARGET_HAS_div_i64 0
#define TCG_TARGET_HAS_rem_i64 0
#define TCG_TARGET_HAS_div2_i64 0
#define TCG_TARGET_HAS_rot_i64 0
#define TCG_TARGET_HAS_ext8s_i64 0
#define TCG_TARGET_HAS_ext16s_i64 0
#define TCG_TARGET_HAS_ext32s_i64 0
#define TCG_TARGET_HAS_ext8u_i64 0
#define TCG_TARGET_HAS_ext16u_i64 0
#define TCG_TARGET_HAS_ext32u_i64 0
#define TCG_TARGET_HAS_bswap16_i64 0
#define TCG_TARGET_HAS_bswap32_i64 0
#define TCG_TARGET_HAS_bswap64_i64 0
#define TCG_TARGET_HAS_neg_i64 0
#define TCG_TARGET_HAS_not_i64 0
#define TCG_TARGET_HAS_andc_i64 0
#define TCG_TARGET_HAS_orc_i64 0
#define TCG_TARGET_HAS_eqv_i64 0
#define TCG_TARGET_HAS_nand_i64 0
#define TCG_TARGET_HAS_nor_i64 0
#define TCG_TARGET_HAS_clz_i64 0
#define TCG_TARGET_HAS_ctz_i64 0
#define TCG_TARGET_HAS_ctpop_i64 0
#define TCG_TARGET_HAS_deposit_i64 0
#define TCG_TARGET_HAS_extract_i64 0
#define TCG_TARGET_HAS_sextract_i64 0
#define TCG_TARGET_HAS_extract2_i64 0
#define TCG_TARGET_HAS_movcond_i64 0
#define TCG_TARGET_HAS_add2_i64 0
#define TCG_TARGET_HAS_sub2_i64 0
#define TCG_TARGET_HAS_mulu2_i64 0
#define TCG_TARGET_HAS_muls2_i64 0
#define TCG_TARGET_HAS_muluh_i64 0
#define TCG_TARGET_HAS_mulsh_i64 0
/* Turn some undef macros into true macros. */
#define TCG_TARGET_HAS_add2_i32 1
#define TCG_TARGET_HAS_sub2_i32 1
#endif
#ifndef TCG_TARGET_deposit_i32_valid
#define TCG_TARGET_deposit_i32_valid(ofs, len) 1
#endif
#ifndef TCG_TARGET_deposit_i64_valid
#define TCG_TARGET_deposit_i64_valid(ofs, len) 1
#endif
#ifndef TCG_TARGET_extract_i32_valid
#define TCG_TARGET_extract_i32_valid(ofs, len) 1
#endif
#ifndef TCG_TARGET_extract_i64_valid
#define TCG_TARGET_extract_i64_valid(ofs, len) 1
#endif
/* Only one of DIV or DIV2 should be defined. */
#if defined(TCG_TARGET_HAS_div_i32)
#define TCG_TARGET_HAS_div2_i32 0
#elif defined(TCG_TARGET_HAS_div2_i32)
#define TCG_TARGET_HAS_div_i32 0
#define TCG_TARGET_HAS_rem_i32 0
#endif
#if defined(TCG_TARGET_HAS_div_i64)
#define TCG_TARGET_HAS_div2_i64 0
#elif defined(TCG_TARGET_HAS_div2_i64)
#define TCG_TARGET_HAS_div_i64 0
#define TCG_TARGET_HAS_rem_i64 0
#endif
/* For 32-bit targets, some sort of unsigned widening multiply is required. */
#if TCG_TARGET_REG_BITS == 32 \
&& !(defined(TCG_TARGET_HAS_mulu2_i32) \
|| defined(TCG_TARGET_HAS_muluh_i32))
# error "Missing unsigned widening multiply"
#endif
#if !defined(TCG_TARGET_HAS_v64) \
&& !defined(TCG_TARGET_HAS_v128) \
&& !defined(TCG_TARGET_HAS_v256)
#define TCG_TARGET_MAYBE_vec 0
#define TCG_TARGET_HAS_abs_vec 0
#define TCG_TARGET_HAS_neg_vec 0
#define TCG_TARGET_HAS_not_vec 0
#define TCG_TARGET_HAS_andc_vec 0
#define TCG_TARGET_HAS_orc_vec 0
#define TCG_TARGET_HAS_shi_vec 0
#define TCG_TARGET_HAS_shs_vec 0
#define TCG_TARGET_HAS_shv_vec 0
#define TCG_TARGET_HAS_mul_vec 0
#define TCG_TARGET_HAS_sat_vec 0
#define TCG_TARGET_HAS_minmax_vec 0
#define TCG_TARGET_HAS_bitsel_vec 0
#define TCG_TARGET_HAS_cmpsel_vec 0
#else
#define TCG_TARGET_MAYBE_vec 1
#endif
#ifndef TCG_TARGET_HAS_v64
#define TCG_TARGET_HAS_v64 0
#endif
#ifndef TCG_TARGET_HAS_v128
#define TCG_TARGET_HAS_v128 0
#endif
#ifndef TCG_TARGET_HAS_v256
#define TCG_TARGET_HAS_v256 0
#endif
#ifndef TARGET_INSN_START_EXTRA_WORDS
# define TARGET_INSN_START_WORDS 1
#else
# define TARGET_INSN_START_WORDS (1 + TARGET_INSN_START_EXTRA_WORDS)
#endif
typedef enum TCGOpcode {
#define DEF(name, oargs, iargs, cargs, flags) INDEX_op_ ## name,
#include "tcg-opc.h"
#undef DEF
NB_OPS,
} TCGOpcode;
#define tcg_regset_set_reg(d, r) ((d) |= (TCGRegSet)1 << (r))
#define tcg_regset_reset_reg(d, r) ((d) &= ~((TCGRegSet)1 << (r)))
#define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)
#ifndef TCG_TARGET_INSN_UNIT_SIZE
# error "Missing TCG_TARGET_INSN_UNIT_SIZE"
#elif TCG_TARGET_INSN_UNIT_SIZE == 1
typedef uint8_t tcg_insn_unit;
#elif TCG_TARGET_INSN_UNIT_SIZE == 2
typedef uint16_t tcg_insn_unit;
#elif TCG_TARGET_INSN_UNIT_SIZE == 4
typedef uint32_t tcg_insn_unit;
#elif TCG_TARGET_INSN_UNIT_SIZE == 8
typedef uint64_t tcg_insn_unit;
#else
/* The port better have done this. */
#endif
#if defined CONFIG_DEBUG_TCG || defined QEMU_STATIC_ANALYSIS
# define tcg_debug_assert(X) do { assert(X); } while (0)
#else
# define tcg_debug_assert(X) \
do { if (!(X)) { __builtin_unreachable(); } } while (0)
#endif
typedef struct TCGRelocation TCGRelocation;
struct TCGRelocation {
QSIMPLEQ_ENTRY(TCGRelocation) next;
tcg_insn_unit *ptr;
intptr_t addend;
int type;
};
typedef struct TCGLabel TCGLabel;
struct TCGLabel {
unsigned present : 1;
unsigned has_value : 1;
unsigned id : 14;
unsigned refs : 16;
union {
uintptr_t value;
tcg_insn_unit *value_ptr;
} u;
QSIMPLEQ_HEAD(, TCGRelocation) relocs;
QSIMPLEQ_ENTRY(TCGLabel) next;
};
typedef struct TCGPool {
struct TCGPool *next;
int size;
uint8_t data[0] __attribute__ ((aligned));
} TCGPool;
#define TCG_POOL_CHUNK_SIZE 32768
#define TCG_MAX_TEMPS 512
#define TCG_MAX_INSNS 512
/* when the size of the arguments of a called function is smaller than
this value, they are statically allocated in the TB stack frame */
#define TCG_STATIC_CALL_ARGS_SIZE 128
typedef enum TCGType {
TCG_TYPE_I32,
TCG_TYPE_I64,
TCG_TYPE_V64,
TCG_TYPE_V128,
TCG_TYPE_V256,
TCG_TYPE_COUNT, /* number of different types */
/* An alias for the size of the host register. */
#if TCG_TARGET_REG_BITS == 32
TCG_TYPE_REG = TCG_TYPE_I32,
#else
TCG_TYPE_REG = TCG_TYPE_I64,
#endif
/* An alias for the size of the native pointer. */
#if UINTPTR_MAX == UINT32_MAX
TCG_TYPE_PTR = TCG_TYPE_I32,
#else
TCG_TYPE_PTR = TCG_TYPE_I64,
#endif
/* An alias for the size of the target "long", aka register. */
#if TARGET_LONG_BITS == 64
TCG_TYPE_TL = TCG_TYPE_I64,
#else
TCG_TYPE_TL = TCG_TYPE_I32,
#endif
} TCGType;
/**
* get_alignment_bits
* @memop: MemOp value
*
* Extract the alignment size from the memop.
*/
static inline unsigned get_alignment_bits(MemOp memop)
{
unsigned a = memop & MO_AMASK;
if (a == MO_UNALN) {
/* No alignment required. */
a = 0;
} else if (a == MO_ALIGN) {
/* A natural alignment requirement. */
a = memop & MO_SIZE;
} else {
/* A specific alignment requirement. */
a = a >> MO_ASHIFT;
}
#if defined(CONFIG_SOFTMMU)
/* The requested alignment cannot overlap the TLB flags. */
tcg_debug_assert((TLB_FLAGS_MASK & ((1 << a) - 1)) == 0);
#endif
return a;
}
typedef tcg_target_ulong TCGArg;
/* Define type and accessor macros for TCG variables.
TCG variables are the inputs and outputs of TCG ops, as described
in tcg/README. Target CPU front-end code uses these types to deal
with TCG variables as it emits TCG code via the tcg_gen_* functions.
They come in several flavours:
* TCGv_i32 : 32 bit integer type
* TCGv_i64 : 64 bit integer type
* TCGv_ptr : a host pointer type
* TCGv_vec : a host vector type; the exact size is not exposed
to the CPU front-end code.
* TCGv : an integer type the same size as target_ulong
(an alias for either TCGv_i32 or TCGv_i64)
The compiler's type checking will complain if you mix them
up and pass the wrong sized TCGv to a function.
Users of tcg_gen_* don't need to know about any of the internal
details of these, and should treat them as opaque types.
You won't be able to look inside them in a debugger either.
Internal implementation details follow:
Note that there is no definition of the structs TCGv_i32_d etc anywhere.
This is deliberate, because the values we store in variables of type
TCGv_i32 are not really pointers-to-structures. They're just small
integers, but keeping them in pointer types like this means that the
compiler will complain if you accidentally pass a TCGv_i32 to a
function which takes a TCGv_i64, and so on. Only the internals of
TCG need to care about the actual contents of the types. */
typedef struct TCGv_i32_d *TCGv_i32;
typedef struct TCGv_i64_d *TCGv_i64;
typedef struct TCGv_ptr_d *TCGv_ptr;
typedef struct TCGv_vec_d *TCGv_vec;
typedef TCGv_ptr TCGv_env;
#if TARGET_LONG_BITS == 32
#define TCGv TCGv_i32
#elif TARGET_LONG_BITS == 64
#define TCGv TCGv_i64
#else
#error Unhandled TARGET_LONG_BITS value
#endif
/* call flags */
/* Helper does not read globals (either directly or through an exception). It
implies TCG_CALL_NO_WRITE_GLOBALS. */
#define TCG_CALL_NO_READ_GLOBALS 0x0001
/* Helper does not write globals */
#define TCG_CALL_NO_WRITE_GLOBALS 0x0002
/* Helper can be safely suppressed if the return value is not used. */
#define TCG_CALL_NO_SIDE_EFFECTS 0x0004
/* Helper is QEMU_NORETURN. */
#define TCG_CALL_NO_RETURN 0x0008
/* convenience version of most used call flags */
#define TCG_CALL_NO_RWG TCG_CALL_NO_READ_GLOBALS
#define TCG_CALL_NO_WG TCG_CALL_NO_WRITE_GLOBALS
#define TCG_CALL_NO_SE TCG_CALL_NO_SIDE_EFFECTS
#define TCG_CALL_NO_RWG_SE (TCG_CALL_NO_RWG | TCG_CALL_NO_SE)
#define TCG_CALL_NO_WG_SE (TCG_CALL_NO_WG | TCG_CALL_NO_SE)
/* Used to align parameters. See the comment before tcgv_i32_temp. */
#define TCG_CALL_DUMMY_ARG ((TCGArg)0)
/* Conditions. Note that these are laid out for easy manipulation by
the functions below:
bit 0 is used for inverting;
bit 1 is signed,
bit 2 is unsigned,
bit 3 is used with bit 0 for swapping signed/unsigned. */
typedef enum {
/* non-signed */
TCG_COND_NEVER = 0 | 0 | 0 | 0,
TCG_COND_ALWAYS = 0 | 0 | 0 | 1,
TCG_COND_EQ = 8 | 0 | 0 | 0,
TCG_COND_NE = 8 | 0 | 0 | 1,
/* signed */
TCG_COND_LT = 0 | 0 | 2 | 0,
TCG_COND_GE = 0 | 0 | 2 | 1,
TCG_COND_LE = 8 | 0 | 2 | 0,
TCG_COND_GT = 8 | 0 | 2 | 1,
/* unsigned */
TCG_COND_LTU = 0 | 4 | 0 | 0,
TCG_COND_GEU = 0 | 4 | 0 | 1,
TCG_COND_LEU = 8 | 4 | 0 | 0,
TCG_COND_GTU = 8 | 4 | 0 | 1,
} TCGCond;
/* Invert the sense of the comparison. */
static inline TCGCond tcg_invert_cond(TCGCond c)
{
return (TCGCond)(c ^ 1);
}
/* Swap the operands in a comparison. */
static inline TCGCond tcg_swap_cond(TCGCond c)
{
return c & 6 ? (TCGCond)(c ^ 9) : c;
}
/* Create an "unsigned" version of a "signed" comparison. */
static inline TCGCond tcg_unsigned_cond(TCGCond c)
{
return c & 2 ? (TCGCond)(c ^ 6) : c;
}
/* Create a "signed" version of an "unsigned" comparison. */
static inline TCGCond tcg_signed_cond(TCGCond c)
{
return c & 4 ? (TCGCond)(c ^ 6) : c;
}
/* Must a comparison be considered unsigned? */
static inline bool is_unsigned_cond(TCGCond c)
{
return (c & 4) != 0;
}
/* Create a "high" version of a double-word comparison.
This removes equality from a LTE or GTE comparison. */
static inline TCGCond tcg_high_cond(TCGCond c)
{
switch (c) {
case TCG_COND_GE:
case TCG_COND_LE:
case TCG_COND_GEU:
case TCG_COND_LEU:
return (TCGCond)(c ^ 8);
default:
return c;
}
}
typedef enum TCGTempVal {
TEMP_VAL_DEAD,
TEMP_VAL_REG,
TEMP_VAL_MEM,
TEMP_VAL_CONST,
} TCGTempVal;
typedef struct TCGTemp {
TCGReg reg:8;
TCGTempVal val_type:8;
TCGType base_type:8;
TCGType type:8;
unsigned int fixed_reg:1;
unsigned int indirect_reg:1;
unsigned int indirect_base:1;
unsigned int mem_coherent:1;
unsigned int mem_allocated:1;
/* If true, the temp is saved across both basic blocks and
translation blocks. */
unsigned int temp_global:1;
/* If true, the temp is saved across basic blocks but dead
at the end of translation blocks. If false, the temp is
dead at the end of basic blocks. */
unsigned int temp_local:1;
unsigned int temp_allocated:1;
tcg_target_long val;
struct TCGTemp *mem_base;
intptr_t mem_offset;
const char *name;
/* Pass-specific information that can be stored for a temporary.
One word worth of integer data, and one pointer to data
allocated separately. */
uintptr_t state;
void *state_ptr;
} TCGTemp;
typedef struct TCGContext TCGContext;
typedef struct TCGTempSet {
unsigned long l[BITS_TO_LONGS(TCG_MAX_TEMPS)];
} TCGTempSet;
/* While we limit helpers to 6 arguments, for 32-bit hosts, with padding,
this imples a max of 6*2 (64-bit in) + 2 (64-bit out) = 14 operands.
There are never more than 2 outputs, which means that we can store all
dead + sync data within 16 bits. */
#define DEAD_ARG 4
#define SYNC_ARG 1
typedef uint16_t TCGLifeData;
/* The layout here is designed to avoid a bitfield crossing of
a 32-bit boundary, which would cause GCC to add extra padding. */
typedef struct TCGOp {
TCGOpcode opc : 8; /* 8 */
/* Parameters for this opcode. See below. */
unsigned param1 : 4; /* 12 */
unsigned param2 : 4; /* 16 */
/* Lifetime data of the operands. */
unsigned life : 16; /* 32 */
/* Next and previous opcodes. */
QTAILQ_ENTRY(TCGOp) link;
#ifdef CONFIG_PLUGIN
QSIMPLEQ_ENTRY(TCGOp) plugin_link;
#endif
/* Arguments for the opcode. */
TCGArg args[MAX_OPC_PARAM];
/* Register preferences for the output(s). */
TCGRegSet output_pref[2];
} TCGOp;
#define TCGOP_CALLI(X) (X)->param1
#define TCGOP_CALLO(X) (X)->param2
#define TCGOP_VECL(X) (X)->param1
#define TCGOP_VECE(X) (X)->param2
/* Make sure operands fit in the bitfields above. */
QEMU_BUILD_BUG_ON(NB_OPS > (1 << 8));
typedef struct TCGProfile {
int64_t cpu_exec_time;
int64_t tb_count1;
int64_t tb_count;
int64_t op_count; /* total insn count */
int op_count_max; /* max insn per TB */
int temp_count_max;
int64_t temp_count;
int64_t del_op_count;
int64_t code_in_len;
int64_t code_out_len;
int64_t search_out_len;
int64_t interm_time;
int64_t code_time;
int64_t la_time;
int64_t opt_time;
int64_t restore_count;
int64_t restore_time;
int64_t table_op_count[NB_OPS];
} TCGProfile;
struct TCGContext {
uint8_t *pool_cur, *pool_end;
TCGPool *pool_first, *pool_current, *pool_first_large;
int nb_labels;
int nb_globals;
int nb_temps;
int nb_indirects;
int nb_ops;
/* goto_tb support */
tcg_insn_unit *code_buf;
uint16_t *tb_jmp_reset_offset; /* tb->jmp_reset_offset */
uintptr_t *tb_jmp_insn_offset; /* tb->jmp_target_arg if direct_jump */
uintptr_t *tb_jmp_target_addr; /* tb->jmp_target_arg if !direct_jump */
TCGRegSet reserved_regs;
uint32_t tb_cflags; /* cflags of the current TB */
intptr_t current_frame_offset;
intptr_t frame_start;
intptr_t frame_end;
TCGTemp *frame_temp;
tcg_insn_unit *code_ptr;
#ifdef CONFIG_PROFILER
TCGProfile prof;
#endif
#ifdef CONFIG_DEBUG_TCG
int temps_in_use;
int goto_tb_issue_mask;
const TCGOpcode *vecop_list;
#endif
/* Code generation. Note that we specifically do not use tcg_insn_unit
here, because there's too much arithmetic throughout that relies
on addition and subtraction working on bytes. Rely on the GCC
extension that allows arithmetic on void*. */
void *code_gen_prologue;
void *code_gen_epilogue;
void *code_gen_buffer;
size_t code_gen_buffer_size;
void *code_gen_ptr;
void *data_gen_ptr;
/* Threshold to flush the translated code buffer. */
void *code_gen_highwater;
size_t tb_phys_invalidate_count;
/* Track which vCPU triggers events */
CPUState *cpu; /* *_trans */
/* These structures are private to tcg-target.inc.c. */
#ifdef TCG_TARGET_NEED_LDST_LABELS
QSIMPLEQ_HEAD(, TCGLabelQemuLdst) ldst_labels;
#endif
#ifdef TCG_TARGET_NEED_POOL_LABELS
struct TCGLabelPoolData *pool_labels;
#endif
TCGLabel *exitreq_label;
#ifdef CONFIG_PLUGIN
/*
* We keep one plugin_tb struct per TCGContext. Note that on every TB
* translation we clear but do not free its contents; this way we
* avoid a lot of malloc/free churn, since after a few TB's it's
* unlikely that we'll need to allocate either more instructions or more
* space for instructions (for variable-instruction-length ISAs).
*/
struct qemu_plugin_tb *plugin_tb;
/* descriptor of the instruction being translated */
struct qemu_plugin_insn *plugin_insn;
/* list to quickly access the injected ops */
QSIMPLEQ_HEAD(, TCGOp) plugin_ops;
#endif
TCGTempSet free_temps[TCG_TYPE_COUNT * 2];
TCGTemp temps[TCG_MAX_TEMPS]; /* globals first, temps after */
QTAILQ_HEAD(, TCGOp) ops, free_ops;
QSIMPLEQ_HEAD(, TCGLabel) labels;
/* Tells which temporary holds a given register.
It does not take into account fixed registers */
TCGTemp *reg_to_temp[TCG_TARGET_NB_REGS];
uint16_t gen_insn_end_off[TCG_MAX_INSNS];
target_ulong gen_insn_data[TCG_MAX_INSNS][TARGET_INSN_START_WORDS];
};
extern TCGContext tcg_init_ctx;
extern __thread TCGContext *tcg_ctx;
extern TCGv_env cpu_env;
static inline size_t temp_idx(TCGTemp *ts)
{
ptrdiff_t n = ts - tcg_ctx->temps;
tcg_debug_assert(n >= 0 && n < tcg_ctx->nb_temps);
return n;
}
static inline TCGArg temp_arg(TCGTemp *ts)
{
return (uintptr_t)ts;
}
static inline TCGTemp *arg_temp(TCGArg a)
{
return (TCGTemp *)(uintptr_t)a;
}
/* Using the offset of a temporary, relative to TCGContext, rather than
its index means that we don't use 0. That leaves offset 0 free for
a NULL representation without having to leave index 0 unused. */
static inline TCGTemp *tcgv_i32_temp(TCGv_i32 v)
{
uintptr_t o = (uintptr_t)v;
TCGTemp *t = (void *)tcg_ctx + o;
tcg_debug_assert(offsetof(TCGContext, temps[temp_idx(t)]) == o);
return t;
}
static inline TCGTemp *tcgv_i64_temp(TCGv_i64 v)
{
return tcgv_i32_temp((TCGv_i32)v);
}
static inline TCGTemp *tcgv_ptr_temp(TCGv_ptr v)
{
return tcgv_i32_temp((TCGv_i32)v);
}
static inline TCGTemp *tcgv_vec_temp(TCGv_vec v)
{
return tcgv_i32_temp((TCGv_i32)v);
}
static inline TCGArg tcgv_i32_arg(TCGv_i32 v)
{
return temp_arg(tcgv_i32_temp(v));
}
static inline TCGArg tcgv_i64_arg(TCGv_i64 v)
{
return temp_arg(tcgv_i64_temp(v));
}
static inline TCGArg tcgv_ptr_arg(TCGv_ptr v)
{
return temp_arg(tcgv_ptr_temp(v));
}
static inline TCGArg tcgv_vec_arg(TCGv_vec v)
{
return temp_arg(tcgv_vec_temp(v));
}
static inline TCGv_i32 temp_tcgv_i32(TCGTemp *t)
{
(void)temp_idx(t); /* trigger embedded assert */
return (TCGv_i32)((void *)t - (void *)tcg_ctx);
}
static inline TCGv_i64 temp_tcgv_i64(TCGTemp *t)
{
return (TCGv_i64)temp_tcgv_i32(t);
}
static inline TCGv_ptr temp_tcgv_ptr(TCGTemp *t)
{
return (TCGv_ptr)temp_tcgv_i32(t);
}
static inline TCGv_vec temp_tcgv_vec(TCGTemp *t)
{
return (TCGv_vec)temp_tcgv_i32(t);
}
#if TCG_TARGET_REG_BITS == 32
static inline TCGv_i32 TCGV_LOW(TCGv_i64 t)
{
return temp_tcgv_i32(tcgv_i64_temp(t));
}
static inline TCGv_i32 TCGV_HIGH(TCGv_i64 t)
{
return temp_tcgv_i32(tcgv_i64_temp(t) + 1);
}
#endif
static inline void tcg_set_insn_param(TCGOp *op, int arg, TCGArg v)
{
op->args[arg] = v;
}
static inline void tcg_set_insn_start_param(TCGOp *op, int arg, target_ulong v)
{
#if TARGET_LONG_BITS <= TCG_TARGET_REG_BITS
tcg_set_insn_param(op, arg, v);
#else
tcg_set_insn_param(op, arg * 2, v);
tcg_set_insn_param(op, arg * 2 + 1, v >> 32);
#endif
}
/* The last op that was emitted. */
static inline TCGOp *tcg_last_op(void)
{
return QTAILQ_LAST(&tcg_ctx->ops);
}
/* Test for whether to terminate the TB for using too many opcodes. */
static inline bool tcg_op_buf_full(void)
{
/* This is not a hard limit, it merely stops translation when
* we have produced "enough" opcodes. We want to limit TB size
* such that a RISC host can reasonably use a 16-bit signed
* branch within the TB. We also need to be mindful of the
* 16-bit unsigned offsets, TranslationBlock.jmp_reset_offset[]
* and TCGContext.gen_insn_end_off[].
*/
return tcg_ctx->nb_ops >= 4000;
}
/* pool based memory allocation */
/* user-mode: mmap_lock must be held for tcg_malloc_internal. */
void *tcg_malloc_internal(TCGContext *s, int size);
void tcg_pool_reset(TCGContext *s);
TranslationBlock *tcg_tb_alloc(TCGContext *s);
void tcg_region_init(void);
void tcg_region_reset_all(void);
size_t tcg_code_size(void);
size_t tcg_code_capacity(void);
void tcg_tb_insert(TranslationBlock *tb);
void tcg_tb_remove(TranslationBlock *tb);
size_t tcg_tb_phys_invalidate_count(void);
TranslationBlock *tcg_tb_lookup(uintptr_t tc_ptr);
void tcg_tb_foreach(GTraverseFunc func, gpointer user_data);
size_t tcg_nb_tbs(void);
/* user-mode: Called with mmap_lock held. */
static inline void *tcg_malloc(int size)
{
TCGContext *s = tcg_ctx;
uint8_t *ptr, *ptr_end;
/* ??? This is a weak placeholder for minimum malloc alignment. */
size = QEMU_ALIGN_UP(size, 8);
ptr = s->pool_cur;
ptr_end = ptr + size;
if (unlikely(ptr_end > s->pool_end)) {
return tcg_malloc_internal(tcg_ctx, size);
} else {
s->pool_cur = ptr_end;
return ptr;
}
}
void tcg_context_init(TCGContext *s);
void tcg_register_thread(void);
void tcg_prologue_init(TCGContext *s);
void tcg_func_start(TCGContext *s);
int tcg_gen_code(TCGContext *s, TranslationBlock *tb);
void tcg_set_frame(TCGContext *s, TCGReg reg, intptr_t start, intptr_t size);
TCGTemp *tcg_global_mem_new_internal(TCGType, TCGv_ptr,
intptr_t, const char *);
TCGTemp *tcg_temp_new_internal(TCGType, bool);
void tcg_temp_free_internal(TCGTemp *);
TCGv_vec tcg_temp_new_vec(TCGType type);
TCGv_vec tcg_temp_new_vec_matching(TCGv_vec match);
static inline void tcg_temp_free_i32(TCGv_i32 arg)
{
tcg_temp_free_internal(tcgv_i32_temp(arg));
}
static inline void tcg_temp_free_i64(TCGv_i64 arg)
{
tcg_temp_free_internal(tcgv_i64_temp(arg));
}
static inline void tcg_temp_free_ptr(TCGv_ptr arg)
{
tcg_temp_free_internal(tcgv_ptr_temp(arg));
}
static inline void tcg_temp_free_vec(TCGv_vec arg)
{
tcg_temp_free_internal(tcgv_vec_temp(arg));
}
static inline TCGv_i32 tcg_global_mem_new_i32(TCGv_ptr reg, intptr_t offset,
const char *name)
{
TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I32, reg, offset, name);
return temp_tcgv_i32(t);
}
static inline TCGv_i32 tcg_temp_new_i32(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, false);
return temp_tcgv_i32(t);
}
static inline TCGv_i32 tcg_temp_local_new_i32(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I32, true);
return temp_tcgv_i32(t);
}
static inline TCGv_i64 tcg_global_mem_new_i64(TCGv_ptr reg, intptr_t offset,
const char *name)
{
TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_I64, reg, offset, name);
return temp_tcgv_i64(t);
}
static inline TCGv_i64 tcg_temp_new_i64(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, false);
return temp_tcgv_i64(t);
}
static inline TCGv_i64 tcg_temp_local_new_i64(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_I64, true);
return temp_tcgv_i64(t);
}
static inline TCGv_ptr tcg_global_mem_new_ptr(TCGv_ptr reg, intptr_t offset,
const char *name)
{
TCGTemp *t = tcg_global_mem_new_internal(TCG_TYPE_PTR, reg, offset, name);
return temp_tcgv_ptr(t);
}
static inline TCGv_ptr tcg_temp_new_ptr(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, false);
return temp_tcgv_ptr(t);
}
static inline TCGv_ptr tcg_temp_local_new_ptr(void)
{
TCGTemp *t = tcg_temp_new_internal(TCG_TYPE_PTR, true);
return temp_tcgv_ptr(t);
}
#if defined(CONFIG_DEBUG_TCG)
/* If you call tcg_clear_temp_count() at the start of a section of
* code which is not supposed to leak any TCG temporaries, then
* calling tcg_check_temp_count() at the end of the section will
* return 1 if the section did in fact leak a temporary.
*/
void tcg_clear_temp_count(void);
int tcg_check_temp_count(void);
#else
#define tcg_clear_temp_count() do { } while (0)
#define tcg_check_temp_count() 0
#endif
int64_t tcg_cpu_exec_time(void);
void tcg_dump_info(void);
void tcg_dump_op_count(void);
#define TCG_CT_ALIAS 0x80
#define TCG_CT_IALIAS 0x40
#define TCG_CT_NEWREG 0x20 /* output requires a new register */
#define TCG_CT_REG 0x01
#define TCG_CT_CONST 0x02 /* any constant of register size */
typedef struct TCGArgConstraint {
uint16_t ct;
uint8_t alias_index;
union {
TCGRegSet regs;
} u;
} TCGArgConstraint;
#define TCG_MAX_OP_ARGS 16
/* Bits for TCGOpDef->flags, 8 bits available. */
enum {
/* Instruction exits the translation block. */
TCG_OPF_BB_EXIT = 0x01,
/* Instruction defines the end of a basic block. */
TCG_OPF_BB_END = 0x02,
/* Instruction clobbers call registers and potentially update globals. */
TCG_OPF_CALL_CLOBBER = 0x04,
/* Instruction has side effects: it cannot be removed if its outputs
are not used, and might trigger exceptions. */
TCG_OPF_SIDE_EFFECTS = 0x08,
/* Instruction operands are 64-bits (otherwise 32-bits). */
TCG_OPF_64BIT = 0x10,
/* Instruction is optional and not implemented by the host, or insn
is generic and should not be implemened by the host. */
TCG_OPF_NOT_PRESENT = 0x20,
/* Instruction operands are vectors. */
TCG_OPF_VECTOR = 0x40,
};
typedef struct TCGOpDef {
const char *name;
uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;
uint8_t flags;
TCGArgConstraint *args_ct;