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tinyjit.hpp
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#pragma once
#include <xstd/type_helpers.hpp>
#include <span>
#include <array>
#include <optional>
#include <variant>
namespace tinyjit
{
// Nop table.
//
static constexpr size_t max_nop_length = 15;
static constexpr uint8_t nop_table[ max_nop_length + 1 ][ max_nop_length ] = {
{},
{ 0x90 },
{ 0x66, 0x90 },
{ 0x0F, 0x1F, 0x00 },
{ 0x0F, 0x1F, 0x40, 0x00 },
{ 0x0F, 0x1F, 0x44, 0x00, 0x00 },
{ 0x66, 0x0F, 0x1F, 0x44, 0x00, 0x00 },
{ 0x0F, 0x1F, 0x80, 0x00, 0x00, 0x00, 0x00 },
{ 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x66, 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x66, 0x66, 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x66, 0x66, 0x66, 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x2E, 0x0F, 0x1F, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }
};
// Register indexes.
//
static constexpr uint8_t extend_rex_flag = 8;
static constexpr uint8_t force_rex_flag = 16;
enum class r64 : uint8_t
{
rax = 0,
rcx = 1,
rdx = 2,
rbx = 3,
rsp = 4,
rbp = 5,
rsi = 6,
rdi = 7,
r8 = 8,
r9 = 9,
r10 = 10,
r11 = 11,
r12 = 12,
r13 = 13,
r14 = 14,
r15 = 15,
};
enum class r32 : uint8_t
{
eax = 0,
ecx = 1,
edx = 2,
ebx = 3,
esp = 4,
ebp = 5,
esi = 6,
edi = 7,
r8d = 8,
r9d = 9,
r10d = 10,
r11d = 11,
r12d = 12,
r13d = 13,
r14d = 14,
r15d = 15,
};
enum class r16 : uint8_t
{
ax = 0,
cx = 1,
dx = 2,
bx = 3,
sp = 4,
bp = 5,
si = 6,
di = 7,
r8w = 8,
r9w = 9,
r10w = 10,
r11w = 11,
r12w = 12,
r13w = 13,
r14w = 14,
r15w = 15,
};
enum class r8 : uint8_t
{
al = 0,
cl = 1,
dl = 2,
bl = 3,
ah = 4,
ch = 5,
dh = 6,
bh = 7,
spl = 4 | force_rex_flag,
bpl = 5 | force_rex_flag,
sil = 6 | force_rex_flag,
dil = 7 | force_rex_flag,
r8b = 8,
r9b = 9,
r10b = 10,
r11b = 11,
r12b = 12,
r13b = 13,
r14b = 14,
r15b = 15,
};
// Legacy prefixes.
//
enum class prefix : uint8_t
{
invalid = 0x00,
lock = 0xF0,
repnz = 0xF2,
rep = 0xF3,
repz = 0xF3,
cs = 0x2E,
ss = 0x36,
ds = 0x3E,
es = 0x26,
fs = 0x64,
gs = 0x65,
opsz = 0x66,
adsz = 0x67,
};
// REX, ModR/M, SIB encodings.
//
struct rex_t
{
bool b = false; // extends rm / base
bool x = false; // extends idx
bool r = false; // extends reg
bool w = false; // wide op
bool force = false;
FORCE_INLINE constexpr bool redundant() const { return !b && !x && !r && !w && !force; }
FORCE_INLINE constexpr uint8_t encode() const
{
uint8_t result = 0x40;
result |= b ? 1 : 0;
result |= x ? 2 : 0;
result |= r ? 4 : 0;
result |= w ? 8 : 0;
return result;
}
FORCE_INLINE constexpr void extend( bool& at, uint8_t& v )
{
force |= v & force_rex_flag;
at = v & extend_rex_flag;
v &= ~( force_rex_flag | extend_rex_flag );
}
};
struct modrm_t
{
uint8_t rm = 0;
uint8_t reg = 0;
uint8_t mod = 0;
FORCE_INLINE constexpr void set_rm( rex_t& x, uint8_t v )
{
x.extend( x.b, v );
rm = v & 0b111;
}
FORCE_INLINE constexpr void set_reg( rex_t& x, uint8_t v )
{
x.extend( x.r, v );
reg = v & 0b111;
}
FORCE_INLINE constexpr uint8_t encode() const
{
uint8_t result = 0;
result |= ( rm & 0b111 ) << 0;
result |= ( reg & 0b111 ) << 3;
result |= ( mod & 0b11 ) << 6;
return result;
}
};
struct sib_t
{
uint8_t base = 0;
uint8_t idx = 0;
uint8_t scale = 0;
FORCE_INLINE constexpr void set_base( rex_t& x, uint8_t v )
{
x.extend( x.b, v );
base = v & 0b111;
}
FORCE_INLINE constexpr void set_idx( rex_t& x, uint8_t v )
{
x.extend( x.x, v );
idx = v & 0b111;
}
FORCE_INLINE constexpr uint8_t encode() const
{
uint8_t result = 0;
result |= ( base & 0b111 ) << 0;
result |= ( idx & 0b111 ) << 3;
result |= ( scale & 0b11 ) << 6;
return result;
}
};
// General meaning of the mod bits.
//
enum addressing_mode
{
mod_mem = 0b00,
mod_mem_disp8 = 0b01,
mod_mem_disp32 = 0b10,
mod_reg = 0b11,
};
// Memory operand.
//
struct rip_t {};
struct segment_t { prefix pfx; };
struct cs_t : segment_t { FORCE_INLINE constexpr cs_t() : segment_t{ prefix::cs } {} };
struct ss_t : segment_t { FORCE_INLINE constexpr ss_t() : segment_t{ prefix::ss } {} };
struct ds_t : segment_t { FORCE_INLINE constexpr ds_t() : segment_t{ prefix::ds } {} };
struct es_t : segment_t { FORCE_INLINE constexpr es_t() : segment_t{ prefix::es } {} };
struct fs_t : segment_t { FORCE_INLINE constexpr fs_t() : segment_t{ prefix::fs } {} };
struct gs_t : segment_t { FORCE_INLINE constexpr gs_t() : segment_t{ prefix::gs } {} };
struct memory
{
prefix segment = prefix::invalid;
std::optional<std::variant<rip_t, r64>> base = {};
std::optional<r64> index = {};
int32_t disp = 0;
int scale = 0;
FORCE_INLINE explicit constexpr memory( int32_t disp ) : disp( disp ) {}
FORCE_INLINE constexpr memory( rip_t ) : base( rip_t{} ) {}
FORCE_INLINE constexpr memory( int32_t disp, rip_t ) : base( rip_t{} ), disp( disp ) {}
FORCE_INLINE constexpr memory( r64 base ) : base( base ) {}
FORCE_INLINE constexpr memory( int32_t disp, r64 base ) : base( base ), disp( disp ) {}
FORCE_INLINE constexpr memory( r64 index, int scale ) : index( index ), scale( scale ) {}
FORCE_INLINE constexpr memory( int32_t disp, r64 index, int scale ) : index( index ), disp( disp ), scale( scale ) {}
FORCE_INLINE constexpr memory( r64 base, r64 index, int scale = 1 ) : base( base ), index( index ), scale( scale ) {}
FORCE_INLINE constexpr memory( int32_t disp, r64 base, r64 index, int scale = 1 ) : base( base ), index( index ), disp( disp ), scale( scale ) {}
FORCE_INLINE constexpr memory( segment_t seg, int32_t disp ) : segment( seg.pfx ), disp( disp ) {}
FORCE_INLINE constexpr memory( segment_t seg, rip_t ) : segment( seg.pfx ), base( rip_t{} ) {}
FORCE_INLINE constexpr memory( segment_t seg, int32_t disp, rip_t ) : segment( seg.pfx ), base( rip_t{} ), disp( disp ) {}
FORCE_INLINE constexpr memory( segment_t seg, r64 base ) : segment( seg.pfx ), base( base ) {}
FORCE_INLINE constexpr memory( segment_t seg, int32_t disp, r64 base ) : segment( seg.pfx ), base( base ), disp( disp ) {}
FORCE_INLINE constexpr memory( segment_t seg, r64 index, int scale ) : segment( seg.pfx ), index( index ), scale( scale ) {}
FORCE_INLINE constexpr memory( segment_t seg, int32_t disp, r64 index, int scale ) : segment( seg.pfx ), index( index ), disp( disp ), scale( scale ) {}
FORCE_INLINE constexpr memory( segment_t seg, r64 base, r64 index, int scale = 1 ) : segment( seg.pfx ), base( base ), index( index ), scale( scale ) {}
FORCE_INLINE constexpr memory( segment_t seg, int32_t disp, r64 base, r64 index, int scale = 1 ) : segment( seg.pfx ), base( base ), index( index ), disp( disp ), scale( scale ) {}
};
// ModR/M operand.
//
struct modrm_op
{
// Segment prefix.
//
prefix seg = {};
// REX Prefix
rex_t x = {};
// ModR/M encoding.
modrm_t m = {};
// ? SIB.
sib_t s = {};
bool ss = false;
// ? Displacement.
int32_t d = {};
uint8_t dw = 0;
// Registers.
//
FORCE_INLINE constexpr modrm_op( uint8_t reg ) { m.mod = mod_reg; m.set_rm( x, reg ); }
// Memory.
//
FORCE_INLINE constexpr modrm_op( const memory& mem )
{
// Set segment prefix if relevant.
//
seg = mem.segment;
// If rip relative:
//
if ( mem.base && std::holds_alternative<rip_t>( *mem.base ) )
{
m.rm = 0b101;
m.mod = mod_mem;
d = mem.disp;
dw = 4;
return;
}
// Figure out the minimum displacement we can get away with.
//
d = mem.disp;
if ( xstd::const_condition( d == 0 ) )
{
// If RBP/R13, force a disp8, since otherwise it implies an exceptional case.
//
if ( mem.base && ( ( ( uint8_t ) std::get<r64>( *mem.base ) ) & 0b111 ) == 0b101 )
dw = 1, m.mod = mod_mem_disp8;
else
dw = 0, m.mod = mod_mem;
}
else if ( xstd::const_condition( d == int8_t( d ) ) )
dw = 1, m.mod = mod_mem_disp8;
else
dw = 4, m.mod = mod_mem_disp32;
// Try to encode without SIB if possible:
//
if ( !mem.index && mem.base )
{
// If RSP/R12, we have to encode as SIB.
//
auto base = std::get<r64>( *mem.base );
if ( ( uint8_t( base ) & 0b111 ) != 0b100 )
{
// Set the R/M and return.
//
m.set_rm( x, ( uint8_t ) base );
return;
}
}
// Declare SIB present.
//
ss = true;
m.rm = 0b100;
// Encode the scale.
//
switch ( mem.scale )
{
case 0:
case 1: s.scale = 0; break;
case 2: s.scale = 1; break;
case 4: s.scale = 2; break;
case 8: s.scale = 3; break;
default: unreachable();
}
// Encode the base.
//
if ( mem.base )
s.set_base( x, ( uint8_t ) std::get<r64>( *mem.base ) );
else
s.set_base( x, 0b101 );
// Encode the index.
//
if ( mem.index )
s.set_idx( x, ( uint8_t ) *mem.index );
else
s.set_idx( x, 0b100 );
// Handle exceptional cases.
//
// - [base]
if ( mem.base && d == 0 && !mem.index )
{
m.mod = mod_mem;
}
// - [disp32]
else if ( d != 0 && !mem.base && !mem.index )
{
dw = 4;
m.mod = mod_mem;
}
// - [index*s + disp32]
else if ( mem.index && !mem.base )
{
dw = 4;
m.mod = mod_mem;
}
}
// Sets the reg/w fields.
//
FORCE_INLINE constexpr void set_reg( uint8_t v )
{
x.extend( x.r, v );
m.reg = v & 0b111;
}
template<typename T> requires ( std::is_enum_v<T> && std::is_same_v<std::underlying_type_t<T>, uint8_t> )
FORCE_INLINE constexpr void set_reg( T v )
{
return set_reg( ( uint8_t ) v );
}
FORCE_INLINE constexpr void set_w( bool v = true ) { x.w = v; }
};
template<typename Reg>
struct modrm_operand : modrm_op
{
FORCE_INLINE constexpr modrm_operand( Reg r ) requires ( !std::is_same_v<Reg, memory> ) : modrm_op( ( uint8_t ) r ) {}
FORCE_INLINE constexpr modrm_operand( const memory& m ) : modrm_op( m ) {}
};
// Label wrapper.
//
struct label_t
{
size_t iterator;
FORCE_INLINE constexpr label_t( size_t iterator ) : iterator( iterator ) {}
};
struct forward_label_t
{
bool is_short = true;
size_t rip = 0;
};
// Opcode list.
//
enum class cc : uint8_t
{
jo = 0,
jno = 1,
jb = 2,
jnae = 2,
jc = 2,
jnb = 3,
jae = 3,
jnc = 3,
jz = 4,
je = 4,
jnz = 5,
jne = 5,
jbe = 6,
jna = 6,
jnbe = 7,
ja = 7,
js = 8,
jns = 9,
jp = 10,
jpe = 10,
jnp = 11,
jpo = 11,
jl = 12,
jnge = 12,
jnl = 13,
jge = 13,
jle = 14,
jng = 14,
jnle = 15,
jg = 15,
};
enum class opcode : uint32_t
{
add_rm_r = 0x01,
add_r_rm = 0x03,
or_rm_r = 0x09,
or_r_rm = 0x0B,
sub_rm_r = 0x29,
sub_r_rm = 0x2B,
xor_rm_r = 0x31,
add_rm_imm = 0x81, // /0
or_rm_imm = 0x81, // /1
sub_rm_imm = 0x81, // /5
add_rm_i8 = 0x83, // /0
or_rm_i8 = 0x83, // /1
sub_rm_i8 = 0x83, // /5
mov_rm_r = 0x89,
mov_r_rm = 0x8B,
mov_r_imm = 0xB8, // +r
rol_rm_i8 = 0xC1, // /0
ror_rm_i8 = 0xC1, // /1
rcl_rm_i8 = 0xC1, // /2
rcr_rm_i8 = 0xC1, // /3
shl_rm_i8 = 0xC1, // /4
shr_rm_i8 = 0xC1, // /5
sal_rm_i8 = 0xC1, // /6
sar_rm_i8 = 0xC1, // /7
ret = 0xC3,
mov_rm_imm = 0xC7,
call_rm = 0xFF, // /2
jmp_rm = 0xFF, // /4
invlpg = 0x0F'01, // /7
mov_r64_cr = 0x0F'20,
mov_r64_dr = 0x0F'21,
mov_cr_r64 = 0x0F'22,
mov_dr_r64 = 0x0F'23,
wrmsr = 0x0F'30,
rdtsc = 0x0F'31,
rdmsr = 0x0F'32,
jcc_i8 = 0x70, // +cc
jcc_i32 = 0x0F'80, // +cc
jmp_i8 = 0xEB,
jmp_i32 = 0xE9,
call_i32 = 0xE8,
loopnz_i8 = 0xE0,
loopz_i8 = 0xE1,
loop_i8 = 0xE2,
lea_r_rm = 0x8D,
movups_r_rm = 0x0F'10,
movups_rm_r = 0x0F'11,
movaps_r_rm = 0x0F'28,
movaps_rm_r = 0x0F'29,
push_r = 0x50, // +r
pop_r = 0x58, // +r
};
// Tiny JIT assembler for a certain select opcodes.
//
template<typename Range, bool Safe = false>
struct basic_assembler
{
Range range = {};
size_t iterator = 0;
bool overflow = false;
// Explicit construction by range.
//
FORCE_INLINE constexpr basic_assembler( Range&& range ) noexcept : range( std::move( range ) ) {}
FORCE_INLINE constexpr basic_assembler( const Range& range ) noexcept : range( range ) {}
// Default construction, move and copy.
//
constexpr basic_assembler() = default;
constexpr basic_assembler( basic_assembler&& ) noexcept = default;
constexpr basic_assembler( const basic_assembler& ) = default;
constexpr basic_assembler& operator=( basic_assembler&& ) noexcept = default;
constexpr basic_assembler& operator=( const basic_assembler& ) = default;
// Make iterable.
//
FORCE_INLINE constexpr uint8_t* data() { return &range[ 0 ]; }
FORCE_INLINE constexpr uint8_t* begin() { return &range[ 0 ]; }
FORCE_INLINE constexpr const uint8_t* begin() const { return &range[ 0 ]; }
FORCE_INLINE constexpr uint8_t* end() { return &range[ iterator ]; }
FORCE_INLINE constexpr const uint8_t* end() const { return &range[ iterator ]; }
FORCE_INLINE constexpr size_t size() const { return iterator; }
FORCE_INLINE constexpr size_t capacity() const { return std::size( range ); }
FORCE_INLINE constexpr bool empty() const { return !iterator; }
// Conversion to span.
//
FORCE_INLINE constexpr std::span<uint8_t> span() { return { begin(), end() }; }
FORCE_INLINE constexpr std::span<const uint8_t> span() const { return { begin(), end() }; }
// Stream helpers.
//
FORCE_INLINE constexpr bool check_overflow( size_t append_count )
{
// If constant evaluation, let it access and throw.
//
if ( std::is_constant_evaluated() )
return false;
return ( overflow = capacity() < ( append_count + iterator ) );
}
template<typename T> requires std::is_integral_v<T>
FORCE_INLINE constexpr void insert( T value )
{
if ( Safe && check_overflow( sizeof( T ) ) )
return;
if ( std::is_constant_evaluated() )
{
if constexpr ( sizeof( T ) == 1 )
{
range[ iterator++ ] = value;
}
else
{
auto u = ( std::make_unsigned_t<T> ) value;
for ( size_t n = 0; n != sizeof( T ); n++ )
{
insert( uint8_t( u & 0xFF ) );
u >>= 8;
}
}
}
else
{
memcpy( &range[ iterator ], &value, sizeof( T ) );
iterator += sizeof( T );
}
}
template<typename T> requires ( std::is_enum_v<T> && !std::is_same_v<T, opcode> )
FORCE_INLINE constexpr void insert( T value )
{
return insert( ( std::underlying_type_t<T> ) value );
}
FORCE_INLINE constexpr void insertb( std::span<const uint8_t> value )
{
if ( Safe && check_overflow( value.size() ) )
return;
if ( !std::is_constant_evaluated() )
{
memcpy( &range[ iterator ], value.data(), value.size() );
iterator += value.size();
}
else
{
for ( size_t n = 0; n != value.size(); n++ )
range[ iterator++ ] = value[ n ];
}
}
FORCE_INLINE constexpr void insertb( std::initializer_list<uint8_t> i )
{
return insertb( std::span<const uint8_t>{ i.begin(), i.end() } );
}
// Encoder types.
//
FORCE_INLINE constexpr void insert( opcode op, uint8_t reg = 0 )
{
uint32_t o = ( uint32_t ) op;
if ( o & 0xFF000000 ) insert<uint8_t>( ( uint8_t ) ( o >> 24 ) );
if ( o & 0xFF0000 ) insert<uint8_t>( ( uint8_t ) ( o >> 16 ) );
if ( o & 0xFF00 ) insert<uint8_t>( ( uint8_t ) ( o >> 8 ) );
insert<uint8_t>( ( uint8_t ) ( o + ( reg & 0b111 ) ) );
}
FORCE_INLINE constexpr void insert( rex_t x ) { if ( !x.redundant() ) insert( x.encode() ); }
FORCE_INLINE constexpr void insert( sib_t s ) { insert( s.encode() ); }
FORCE_INLINE constexpr void insert( modrm_t m ) { insert( m.encode() ); }
FORCE_INLINE constexpr void encode( const modrm_op& modrm, opcode op, uint8_t reg = 0 )
{
// Push the segment prefix if relevant.
if ( modrm.seg != prefix::invalid )
insert( modrm.seg );
// Encode the REX prefix if relevant.
insert( modrm.x );
// Encode the opcode.
insert( op, reg );
// Encode the ModR/M.
insert( modrm.m );
// Encode the SIB if relevant.
if ( modrm.ss )
insert( modrm.s );
// Encode the Displacement if relevant.
if ( modrm.dw == 1 )
insert( ( int8_t ) modrm.d );
else if ( modrm.dw == 4 )
insert( ( int32_t ) modrm.d );
}
// Opcodes we've implemented.
//
FORCE_INLINE constexpr void xorl( modrm_operand<r32> op1, r32 op2 )
{
op1.set_reg( op2 );
encode( op1, opcode::xor_rm_r );
}
FORCE_INLINE constexpr void movabs( r64 op1, int64_t imm64 )
{
rex_t x = { .w = true };
uint8_t v = ( uint8_t ) op1;
x.extend( x.b, v );
insert( x );
insert( opcode::mov_r_imm, v );
insert( imm64 );
}
FORCE_INLINE constexpr void movl( r32 op1, int32_t imm32 )
{
rex_t x = { .w = false };
uint8_t v = ( uint8_t ) op1;
x.extend( x.b, v );
insert( x );
insert( opcode::mov_r_imm, v );
insert( imm32 );
}
FORCE_INLINE constexpr void movq( modrm_operand<r64> op1, int32_t imm32 )
{
op1.set_w();
encode( op1, opcode::mov_rm_imm );
insert( imm32 );
}
FORCE_INLINE constexpr void wrmsr() { insert( opcode::wrmsr ); }
FORCE_INLINE constexpr void rdmsr() { insert( opcode::rdmsr ); }
FORCE_INLINE constexpr void rdtsc() { insert( opcode::rdtsc ); }
FORCE_INLINE constexpr void ret() { insert( opcode::ret ); }
FORCE_INLINE constexpr void invlpg( modrm_operand<memory> mem )
{
mem.set_reg( 7 );
encode( mem, opcode::invlpg );
}
FORCE_INLINE constexpr void mov_cr( modrm_operand<r64> r, uint8_t i )
{
r.set_reg( i );
encode( r, opcode::mov_r64_cr );
}
FORCE_INLINE constexpr void mov_dr( modrm_operand<r64> r, uint8_t i )
{
r.set_reg( i );
encode( r, opcode::mov_r64_dr );
}
FORCE_INLINE constexpr void mov_cr( modrm_operand<uint8_t> i, r64 r )
{
i.set_reg( r );
encode( i, opcode::mov_cr_r64 );
}
FORCE_INLINE constexpr void mov_dr( modrm_operand<uint8_t> i, r64 r )
{
i.set_reg( r );
encode( i, opcode::mov_dr_r64 );
}
FORCE_INLINE constexpr void rolq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 0 );
r.set_w();
encode( r, opcode::rol_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void rorq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 1 );
r.set_w();
encode( r, opcode::ror_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void rclq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 2 );
r.set_w();
encode( r, opcode::rcl_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void rcrq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 3 );
r.set_w();
encode( r, opcode::rcr_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void shlq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 4 );
r.set_w();
encode( r, opcode::shl_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void shrq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 5 );
r.set_w();
encode( r, opcode::shr_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void salq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 6 );
r.set_w();
encode( r, opcode::sal_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void sarq( modrm_operand<r64> r, int8_t imm )
{
r.set_reg( 8 );
r.set_w();
encode( r, opcode::sar_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void orq( modrm_operand<r64> a, r64 b )
{
a.set_reg( b );
a.set_w();
encode( a, opcode::or_rm_r );
}
FORCE_INLINE constexpr void orq( r64 a, modrm_operand</*r64*/ memory> b )
{
b.set_reg( a );
b.set_w();
encode( b, opcode::or_r_rm );
}
FORCE_INLINE constexpr void addq( modrm_operand<r64> a, r64 b )
{
a.set_reg( b );
a.set_w();
encode( a, opcode::add_rm_r );
}
FORCE_INLINE constexpr void addq( r64 a, modrm_operand</*r64*/ memory> b )
{
b.set_reg( a );
b.set_w();
encode( b, opcode::add_r_rm );
}
FORCE_INLINE constexpr void subq( modrm_operand<r64> a, r64 b )
{
a.set_reg( b );
a.set_w();
encode( a, opcode::sub_rm_r );
}
FORCE_INLINE constexpr void subq( r64 a, modrm_operand</*r64*/ memory> b )
{
b.set_reg( a );
b.set_w();
encode( b, opcode::sub_r_rm );
}
FORCE_INLINE constexpr void addq8( modrm_operand<r64> a, int8_t imm )
{
a.set_reg( 0 );
a.set_w();
encode( a, opcode::add_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void addq( modrm_operand<r64> a, int32_t imm )
{
if ( xstd::const_condition( imm == int8_t( imm ) ) )
return addq8( a, imm );
a.set_reg( 0 );
a.set_w();
encode( a, opcode::add_rm_imm );
insert( imm );
}
FORCE_INLINE constexpr void subq8( modrm_operand<r64> a, int8_t imm )
{
a.set_reg( 5 );
a.set_w();
encode( a, opcode::sub_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void subq( modrm_operand<r64> a, int32_t imm )
{
if ( xstd::const_condition( imm == int8_t( imm ) ) )
return subq8( a, imm );
a.set_reg( 5 );
a.set_w();
encode( a, opcode::sub_rm_imm );
insert( imm );
}
FORCE_INLINE constexpr void orq8( modrm_operand<r64> a, int8_t imm )
{
a.set_reg( 1 );
a.set_w();
encode( a, opcode::or_rm_i8 );
insert( imm );
}
FORCE_INLINE constexpr void orq( modrm_operand<r64> a, int32_t imm )
{
if ( xstd::const_condition( imm == int8_t( imm ) ) )
return orq8( a, imm );
a.set_reg( 1 );
a.set_w();
encode( a, opcode::or_rm_imm );
insert( imm );
}
FORCE_INLINE constexpr void callq( modrm_operand<r64> a )
{
a.set_reg( 2 );
encode( a, opcode::call_rm );
}
FORCE_INLINE constexpr void jmpq( modrm_operand<r64> a )
{
a.set_reg( 4 );
encode( a, opcode::jmp_rm );
}
FORCE_INLINE constexpr void movq( modrm_operand<r64> a, r64 b )
{
a.set_reg( b );
a.set_w();
encode( a, opcode::mov_rm_r );
}
FORCE_INLINE constexpr void movq( r64 a, modrm_operand</*r64*/ memory> b )
{
b.set_reg( a );
b.set_w();
encode( b, opcode::mov_r_rm );
}
FORCE_INLINE constexpr void lea( r64 a, modrm_operand<memory> b )
{
b.set_reg( a );
b.set_w();
encode( b, opcode::lea_r_rm );
}
FORCE_INLINE constexpr void movups( modrm_operand<uint8_t> a, uint8_t b )
{
a.set_reg( b );
encode( a, opcode::movups_rm_r );
}
FORCE_INLINE constexpr void movups( uint8_t a, modrm_operand<memory> b )
{
b.set_reg( a );
encode( b, opcode::movups_r_rm );
}
FORCE_INLINE constexpr void movaps( modrm_operand<uint8_t> a, uint8_t b )
{
a.set_reg( b );
encode( a, opcode::movaps_rm_r );
}
FORCE_INLINE constexpr void movaps( uint8_t a, modrm_operand<memory> b )
{
b.set_reg( a );
encode( b, opcode::movaps_r_rm );
}
FORCE_INLINE constexpr void push( r64 op )
{
rex_t x = { .w = false };
uint8_t v = ( uint8_t ) op;
x.extend( x.b, v );
insert( x );
insert( opcode::push_r, v );
}
FORCE_INLINE constexpr void pop( r64 op )
{
rex_t x = { .w = false };
uint8_t v = ( uint8_t ) op;
x.extend( x.b, v );
insert( x );
insert( opcode::pop_r, v );
}
// Relative operations.
//
FORCE_INLINE constexpr void jcc8( cc c, int8_t r, bool unbase = false )
{
insert( opcode::jcc_i8, ( uint8_t ) c );
insert<int8_t>( unbase ? r - 2 : r );
}
FORCE_INLINE constexpr void jcc( cc c, int32_t r, bool unbase = false )
{
if ( xstd::const_condition( ( unbase ? r - 2 : r ) == int8_t( ( unbase ? r - 2 : r ) ) ) )
return jcc8( c, ( int8_t ) r, unbase );
insert( opcode::jcc_i32, ( uint8_t ) c );
insert( unbase ? r - 6 : r );
}
FORCE_INLINE constexpr void jmp8( int8_t r, bool unbase = false )
{
insert( opcode::jmp_i8 );
insert<int8_t>( unbase ? r - 2 : r );
}
FORCE_INLINE constexpr void jmp( int32_t r, bool unbase = false )
{
if ( xstd::const_condition( ( unbase ? r - 2 : r ) == int8_t( ( unbase ? r - 2 : r ) ) ) )
return jmp8( ( int8_t ) r, unbase );
insert( opcode::jmp_i32 );
insert( unbase ? r - 5 : r );
}
FORCE_INLINE constexpr void call( int32_t r, bool unbase = false )
{
insert( opcode::call_i32 );
insert( unbase ? r - 5 : r );
}
FORCE_INLINE constexpr void loop( int8_t r, bool unbase = false )
{
insert( opcode::loop_i8 );
insert<int8_t>( unbase ? r - 2 : r );
}
FORCE_INLINE constexpr void loopz( int8_t r, bool unbase = false )
{
insert( opcode::loopz_i8 );
insert<int8_t>( unbase ? r - 2 : r );
}
FORCE_INLINE constexpr void loopnz( int8_t r, bool unbase = false )
{
insert( opcode::loopnz_i8 );
insert<int8_t>( unbase ? r - 2 : r );
}
// Absolute helpers.
//
FORCE_INLINE void jmp_abs( const void* ptr, const void* relocated = 0 )
{
if ( !relocated )
relocated = &range[ iterator ];
else
relocated = ( const uint8_t* ) relocated + iterator;
ptrdiff_t delta = ( uint64_t ) ptr - ( uint64_t ) relocated;
if ( auto r = int32_t( delta - 5 ); r == ( delta - 5 ) )
{
jmp( r );
}
else
{
jmpq( memory{ rip_t{} } );
insert( ( uint64_t ) ptr );
}
}
FORCE_INLINE void call_abs( const void* ptr, const void* relocated = 0 )
{
if ( !relocated )
relocated = &range[ iterator ];
else