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circuitpython/py/asmx64.c
Damien George 10830059c5 py/emitnative: Fix x86 native zero checks by comparing full word. 
On x86 archs (both 32 and 64 bit) a bool return value only sets the 8-bit
al register, and the higher bits of the ax register have an undefined
value.  When testing the return value of such cases it is required to just
test al for zero/non-zero.  On the other hand, checking for truth or
zero/non-zero on an integer return value requires checking all bits of the
register.  These two cases must be distinguished and handled correctly in
generated native code.  This patch makes sure of this.

For other supported native archs (ARM, Thumb2, Xtensa) there is no such
distinction and this patch does not change anything for them.
2018-08-04 22:03:49 +10:00

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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.
*/
#include <stdint.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include "py/mpconfig.h"
// wrapper around everything in this file
#if MICROPY_EMIT_X64
#include "py/asmx64.h"
/* all offsets are measured in multiples of 8 bytes */
#define WORD_SIZE (8)
#define OPCODE_NOP (0x90)
#define OPCODE_PUSH_R64 (0x50) /* +rq */
#define OPCODE_PUSH_I64 (0x68)
#define OPCODE_PUSH_M64 (0xff) /* /6 */
#define OPCODE_POP_R64 (0x58) /* +rq */
#define OPCODE_RET (0xc3)
#define OPCODE_MOV_I8_TO_R8 (0xb0) /* +rb */
#define OPCODE_MOV_I64_TO_R64 (0xb8) /* +rq */
#define OPCODE_MOV_I32_TO_RM32 (0xc7)
#define OPCODE_MOV_R8_TO_RM8 (0x88) /* /r */
#define OPCODE_MOV_R64_TO_RM64 (0x89) /* /r */
#define OPCODE_MOV_RM64_TO_R64 (0x8b) /* /r */
#define OPCODE_MOVZX_RM8_TO_R64 (0xb6) /* 0x0f 0xb6/r */
#define OPCODE_MOVZX_RM16_TO_R64 (0xb7) /* 0x0f 0xb7/r */
#define OPCODE_LEA_MEM_TO_R64 (0x8d) /* /r */
#define OPCODE_AND_R64_TO_RM64 (0x21) /* /r */
#define OPCODE_OR_R64_TO_RM64 (0x09) /* /r */
#define OPCODE_XOR_R64_TO_RM64 (0x31) /* /r */
#define OPCODE_ADD_R64_TO_RM64 (0x01) /* /r */
#define OPCODE_ADD_I32_TO_RM32 (0x81) /* /0 */
#define OPCODE_ADD_I8_TO_RM32 (0x83) /* /0 */
#define OPCODE_SUB_R64_FROM_RM64 (0x29)
#define OPCODE_SUB_I32_FROM_RM64 (0x81) /* /5 */
#define OPCODE_SUB_I8_FROM_RM64 (0x83) /* /5 */
//#define OPCODE_SHL_RM32_BY_I8 (0xc1) /* /4 */
//#define OPCODE_SHR_RM32_BY_I8 (0xc1) /* /5 */
//#define OPCODE_SAR_RM32_BY_I8 (0xc1) /* /7 */
#define OPCODE_SHL_RM64_CL (0xd3) /* /4 */
#define OPCODE_SAR_RM64_CL (0xd3) /* /7 */
//#define OPCODE_CMP_I32_WITH_RM32 (0x81) /* /7 */
//#define OPCODE_CMP_I8_WITH_RM32 (0x83) /* /7 */
#define OPCODE_CMP_R64_WITH_RM64 (0x39) /* /r */
//#define OPCODE_CMP_RM32_WITH_R32 (0x3b)
#define OPCODE_TEST_R8_WITH_RM8 (0x84) /* /r */
#define OPCODE_TEST_R64_WITH_RM64 (0x85) /* /r */
#define OPCODE_JMP_REL8 (0xeb)
#define OPCODE_JMP_REL32 (0xe9)
#define OPCODE_JCC_REL8 (0x70) /* | jcc type */
#define OPCODE_JCC_REL32_A (0x0f)
#define OPCODE_JCC_REL32_B (0x80) /* | jcc type */
#define OPCODE_SETCC_RM8_A (0x0f)
#define OPCODE_SETCC_RM8_B (0x90) /* | jcc type, /0 */
#define OPCODE_CALL_REL32 (0xe8)
#define OPCODE_CALL_RM32 (0xff) /* /2 */
#define OPCODE_LEAVE (0xc9)
#define MODRM_R64(x) (((x) & 0x7) << 3)
#define MODRM_RM_DISP0 (0x00)
#define MODRM_RM_DISP8 (0x40)
#define MODRM_RM_DISP32 (0x80)
#define MODRM_RM_REG (0xc0)
#define MODRM_RM_R64(x) ((x) & 0x7)
#define OP_SIZE_PREFIX (0x66)
#define REX_PREFIX (0x40)
#define REX_W (0x08) // width
#define REX_R (0x04) // register
#define REX_X (0x02) // index
#define REX_B (0x01) // base
#define REX_W_FROM_R64(r64) ((r64) >> 0 & 0x08)
#define REX_R_FROM_R64(r64) ((r64) >> 1 & 0x04)
#define REX_X_FROM_R64(r64) ((r64) >> 2 & 0x02)
#define REX_B_FROM_R64(r64) ((r64) >> 3 & 0x01)
#define IMM32_L0(x) ((x) & 0xff)
#define IMM32_L1(x) (((x) >> 8) & 0xff)
#define IMM32_L2(x) (((x) >> 16) & 0xff)
#define IMM32_L3(x) (((x) >> 24) & 0xff)
#define IMM64_L4(x) (((x) >> 32) & 0xff)
#define IMM64_L5(x) (((x) >> 40) & 0xff)
#define IMM64_L6(x) (((x) >> 48) & 0xff)
#define IMM64_L7(x) (((x) >> 56) & 0xff)
#define UNSIGNED_FIT8(x) (((x) & 0xffffffffffffff00) == 0)
#define UNSIGNED_FIT32(x) (((x) & 0xffffffff00000000) == 0)
#define SIGNED_FIT8(x) (((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)
static inline byte *asm_x64_get_cur_to_write_bytes(asm_x64_t *as, int n) {
return mp_asm_base_get_cur_to_write_bytes(&as->base, n);
}
STATIC void asm_x64_write_byte_1(asm_x64_t *as, byte b1) {
byte* c = asm_x64_get_cur_to_write_bytes(as, 1);
if (c != NULL) {
c[0] = b1;
}
}
STATIC void asm_x64_write_byte_2(asm_x64_t *as, byte b1, byte b2) {
byte* c = asm_x64_get_cur_to_write_bytes(as, 2);
if (c != NULL) {
c[0] = b1;
c[1] = b2;
}
}
STATIC void asm_x64_write_byte_3(asm_x64_t *as, byte b1, byte b2, byte b3) {
byte* c = asm_x64_get_cur_to_write_bytes(as, 3);
if (c != NULL) {
c[0] = b1;
c[1] = b2;
c[2] = b3;
}
}
STATIC void asm_x64_write_word32(asm_x64_t *as, int w32) {
byte* c = asm_x64_get_cur_to_write_bytes(as, 4);
if (c != NULL) {
c[0] = IMM32_L0(w32);
c[1] = IMM32_L1(w32);
c[2] = IMM32_L2(w32);
c[3] = IMM32_L3(w32);
}
}
STATIC void asm_x64_write_word64(asm_x64_t *as, int64_t w64) {
byte* c = asm_x64_get_cur_to_write_bytes(as, 8);
if (c != NULL) {
c[0] = IMM32_L0(w64);
c[1] = IMM32_L1(w64);
c[2] = IMM32_L2(w64);
c[3] = IMM32_L3(w64);
c[4] = IMM64_L4(w64);
c[5] = IMM64_L5(w64);
c[6] = IMM64_L6(w64);
c[7] = IMM64_L7(w64);
}
}
/* unused
STATIC void asm_x64_write_word32_to(asm_x64_t *as, int offset, int w32) {
byte* c;
assert(offset + 4 <= as->code_size);
c = as->code_base + offset;
c[0] = IMM32_L0(w32);
c[1] = IMM32_L1(w32);
c[2] = IMM32_L2(w32);
c[3] = IMM32_L3(w32);
}
*/
STATIC void asm_x64_write_r64_disp(asm_x64_t *as, int r64, int disp_r64, int disp_offset) {
assert(disp_r64 != ASM_X64_REG_RSP);
if (disp_r64 == ASM_X64_REG_R12) {
// special case for r12; not fully implemented
assert(SIGNED_FIT8(disp_offset));
asm_x64_write_byte_3(as, MODRM_R64(r64) | MODRM_RM_DISP8 | MODRM_RM_R64(disp_r64), 0x24, IMM32_L0(disp_offset));
return;
}
if (disp_offset == 0 && disp_r64 != ASM_X64_REG_RBP) {
asm_x64_write_byte_1(as, MODRM_R64(r64) | MODRM_RM_DISP0 | MODRM_RM_R64(disp_r64));
} else if (SIGNED_FIT8(disp_offset)) {
asm_x64_write_byte_2(as, MODRM_R64(r64) | MODRM_RM_DISP8 | MODRM_RM_R64(disp_r64), IMM32_L0(disp_offset));
} else {
asm_x64_write_byte_1(as, MODRM_R64(r64) | MODRM_RM_DISP32 | MODRM_RM_R64(disp_r64));
asm_x64_write_word32(as, disp_offset);
}
}
STATIC void asm_x64_generic_r64_r64(asm_x64_t *as, int dest_r64, int src_r64, int op) {
asm_x64_write_byte_3(as, REX_PREFIX | REX_W | REX_R_FROM_R64(src_r64) | REX_B_FROM_R64(dest_r64), op, MODRM_R64(src_r64) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
}
void asm_x64_nop(asm_x64_t *as) {
asm_x64_write_byte_1(as, OPCODE_NOP);
}
void asm_x64_push_r64(asm_x64_t *as, int src_r64) {
if (src_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_PUSH_R64 | src_r64);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_B, OPCODE_PUSH_R64 | (src_r64 & 7));
}
}
/*
void asm_x64_push_i32(asm_x64_t *as, int src_i32) {
asm_x64_write_byte_1(as, OPCODE_PUSH_I64);
asm_x64_write_word32(as, src_i32); // will be sign extended to 64 bits
}
*/
/*
void asm_x64_push_disp(asm_x64_t *as, int src_r64, int src_offset) {
assert(src_r64 < 8);
asm_x64_write_byte_1(as, OPCODE_PUSH_M64);
asm_x64_write_r64_disp(as, 6, src_r64, src_offset);
}
*/
void asm_x64_pop_r64(asm_x64_t *as, int dest_r64) {
if (dest_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_POP_R64 | dest_r64);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_B, OPCODE_POP_R64 | (dest_r64 & 7));
}
}
STATIC void asm_x64_ret(asm_x64_t *as) {
asm_x64_write_byte_1(as, OPCODE_RET);
}
void asm_x64_mov_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_MOV_R64_TO_RM64);
}
void asm_x64_mov_r8_to_mem8(asm_x64_t *as, int src_r64, int dest_r64, int dest_disp) {
if (src_r64 < 8 && dest_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_MOV_R8_TO_RM8);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_R_FROM_R64(src_r64) | REX_B_FROM_R64(dest_r64), OPCODE_MOV_R8_TO_RM8);
}
asm_x64_write_r64_disp(as, src_r64, dest_r64, dest_disp);
}
void asm_x64_mov_r16_to_mem16(asm_x64_t *as, int src_r64, int dest_r64, int dest_disp) {
if (src_r64 < 8 && dest_r64 < 8) {
asm_x64_write_byte_2(as, OP_SIZE_PREFIX, OPCODE_MOV_R64_TO_RM64);
} else {
asm_x64_write_byte_3(as, OP_SIZE_PREFIX, REX_PREFIX | REX_R_FROM_R64(src_r64) | REX_B_FROM_R64(dest_r64), OPCODE_MOV_R64_TO_RM64);
}
asm_x64_write_r64_disp(as, src_r64, dest_r64, dest_disp);
}
void asm_x64_mov_r32_to_mem32(asm_x64_t *as, int src_r64, int dest_r64, int dest_disp) {
if (src_r64 < 8 && dest_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_MOV_R64_TO_RM64);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_R_FROM_R64(src_r64) | REX_B_FROM_R64(dest_r64), OPCODE_MOV_R64_TO_RM64);
}
asm_x64_write_r64_disp(as, src_r64, dest_r64, dest_disp);
}
void asm_x64_mov_r64_to_mem64(asm_x64_t *as, int src_r64, int dest_r64, int dest_disp) {
// use REX prefix for 64 bit operation
asm_x64_write_byte_2(as, REX_PREFIX | REX_W | REX_R_FROM_R64(src_r64) | REX_B_FROM_R64(dest_r64), OPCODE_MOV_R64_TO_RM64);
asm_x64_write_r64_disp(as, src_r64, dest_r64, dest_disp);
}
void asm_x64_mov_mem8_to_r64zx(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
assert(src_r64 < 8);
if (dest_r64 < 8) {
asm_x64_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM8_TO_R64);
} else {
asm_x64_write_byte_3(as, REX_PREFIX | REX_R, 0x0f, OPCODE_MOVZX_RM8_TO_R64);
}
asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}
void asm_x64_mov_mem16_to_r64zx(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
assert(src_r64 < 8);
if (dest_r64 < 8) {
asm_x64_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM16_TO_R64);
} else {
asm_x64_write_byte_3(as, REX_PREFIX | REX_R, 0x0f, OPCODE_MOVZX_RM16_TO_R64);
}
asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}
void asm_x64_mov_mem32_to_r64zx(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
assert(src_r64 < 8);
if (dest_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_MOV_RM64_TO_R64);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_R, OPCODE_MOV_RM64_TO_R64);
}
asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}
void asm_x64_mov_mem64_to_r64(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
// use REX prefix for 64 bit operation
asm_x64_write_byte_2(as, REX_PREFIX | REX_W | REX_R_FROM_R64(dest_r64) | REX_B_FROM_R64(src_r64), OPCODE_MOV_RM64_TO_R64);
asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}
STATIC void asm_x64_lea_disp_to_r64(asm_x64_t *as, int src_r64, int src_disp, int dest_r64) {
// use REX prefix for 64 bit operation
assert(src_r64 < 8);
assert(dest_r64 < 8);
asm_x64_write_byte_2(as, REX_PREFIX | REX_W, OPCODE_LEA_MEM_TO_R64);
asm_x64_write_r64_disp(as, dest_r64, src_r64, src_disp);
}
/*
void asm_x64_mov_i8_to_r8(asm_x64_t *as, int src_i8, int dest_r64) {
assert(dest_r64 < 8);
asm_x64_write_byte_2(as, OPCODE_MOV_I8_TO_R8 | dest_r64, src_i8);
}
*/
STATIC void asm_x64_mov_i32_to_r64(asm_x64_t *as, int src_i32, int dest_r64) {
// cpu defaults to i32 to r64, with zero extension
if (dest_r64 < 8) {
asm_x64_write_byte_1(as, OPCODE_MOV_I64_TO_R64 | dest_r64);
} else {
asm_x64_write_byte_2(as, REX_PREFIX | REX_B, OPCODE_MOV_I64_TO_R64 | (dest_r64 & 7));
}
asm_x64_write_word32(as, src_i32);
}
void asm_x64_mov_i64_to_r64(asm_x64_t *as, int64_t src_i64, int dest_r64) {
// cpu defaults to i32 to r64
// to mov i64 to r64 need to use REX prefix
asm_x64_write_byte_2(as,
REX_PREFIX | REX_W | (dest_r64 < 8 ? 0 : REX_B),
OPCODE_MOV_I64_TO_R64 | (dest_r64 & 7));
asm_x64_write_word64(as, src_i64);
}
void asm_x64_mov_i64_to_r64_optimised(asm_x64_t *as, int64_t src_i64, int dest_r64) {
// TODO use movzx, movsx if possible
if (UNSIGNED_FIT32(src_i64)) {
// 5 bytes
asm_x64_mov_i32_to_r64(as, src_i64 & 0xffffffff, dest_r64);
} else {
// 10 bytes
asm_x64_mov_i64_to_r64(as, src_i64, dest_r64);
}
}
// src_i64 is stored as a full word in the code, and aligned to machine-word boundary
void asm_x64_mov_i64_to_r64_aligned(asm_x64_t *as, int64_t src_i64, int dest_r64) {
// mov instruction uses 2 bytes for the instruction, before the i64
while (((as->base.code_offset + 2) & (WORD_SIZE - 1)) != 0) {
asm_x64_nop(as);
}
asm_x64_mov_i64_to_r64(as, src_i64, dest_r64);
}
void asm_x64_and_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_AND_R64_TO_RM64);
}
void asm_x64_or_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_OR_R64_TO_RM64);
}
void asm_x64_xor_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_XOR_R64_TO_RM64);
}
void asm_x64_shl_r64_cl(asm_x64_t* as, int dest_r64) {
asm_x64_generic_r64_r64(as, dest_r64, 4, OPCODE_SHL_RM64_CL);
}
void asm_x64_sar_r64_cl(asm_x64_t* as, int dest_r64) {
asm_x64_generic_r64_r64(as, dest_r64, 7, OPCODE_SAR_RM64_CL);
}
void asm_x64_add_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_ADD_R64_TO_RM64);
}
void asm_x64_sub_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
asm_x64_generic_r64_r64(as, dest_r64, src_r64, OPCODE_SUB_R64_FROM_RM64);
}
void asm_x64_mul_r64_r64(asm_x64_t *as, int dest_r64, int src_r64) {
// imul reg64, reg/mem64 -- 0x0f 0xaf /r
asm_x64_write_byte_1(as, REX_PREFIX | REX_W | REX_R_FROM_R64(dest_r64) | REX_B_FROM_R64(src_r64));
asm_x64_write_byte_3(as, 0x0f, 0xaf, MODRM_R64(dest_r64) | MODRM_RM_REG | MODRM_RM_R64(src_r64));
}
/*
void asm_x64_sub_i32_from_r32(asm_x64_t *as, int src_i32, int dest_r32) {
if (SIGNED_FIT8(src_i32)) {
// defaults to 32 bit operation
asm_x64_write_byte_2(as, OPCODE_SUB_I8_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
asm_x64_write_byte_1(as, src_i32 & 0xff);
} else {
// defaults to 32 bit operation
asm_x64_write_byte_2(as, OPCODE_SUB_I32_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r32));
asm_x64_write_word32(as, src_i32);
}
}
*/
STATIC void asm_x64_sub_r64_i32(asm_x64_t *as, int dest_r64, int src_i32) {
assert(dest_r64 < 8);
if (SIGNED_FIT8(src_i32)) {
// use REX prefix for 64 bit operation
asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_SUB_I8_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
asm_x64_write_byte_1(as, src_i32 & 0xff);
} else {
// use REX prefix for 64 bit operation
asm_x64_write_byte_3(as, REX_PREFIX | REX_W, OPCODE_SUB_I32_FROM_RM64, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(dest_r64));
asm_x64_write_word32(as, src_i32);
}
}
/*
void asm_x64_shl_r32_by_imm(asm_x64_t *as, int r32, int imm) {
asm_x64_write_byte_2(as, OPCODE_SHL_RM32_BY_I8, MODRM_R64(4) | MODRM_RM_REG | MODRM_RM_R64(r32));
asm_x64_write_byte_1(as, imm);
}
void asm_x64_shr_r32_by_imm(asm_x64_t *as, int r32, int imm) {
asm_x64_write_byte_2(as, OPCODE_SHR_RM32_BY_I8, MODRM_R64(5) | MODRM_RM_REG | MODRM_RM_R64(r32));
asm_x64_write_byte_1(as, imm);
}
void asm_x64_sar_r32_by_imm(asm_x64_t *as, int r32, int imm) {
asm_x64_write_byte_2(as, OPCODE_SAR_RM32_BY_I8, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(r32));
asm_x64_write_byte_1(as, imm);
}
*/
void asm_x64_cmp_r64_with_r64(asm_x64_t *as, int src_r64_a, int src_r64_b) {
asm_x64_generic_r64_r64(as, src_r64_b, src_r64_a, OPCODE_CMP_R64_WITH_RM64);
}
/*
void asm_x64_cmp_i32_with_r32(asm_x64_t *as, int src_i32, int src_r32) {
if (SIGNED_FIT8(src_i32)) {
asm_x64_write_byte_2(as, OPCODE_CMP_I8_WITH_RM32, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(src_r32));
asm_x64_write_byte_1(as, src_i32 & 0xff);
} else {
asm_x64_write_byte_2(as, OPCODE_CMP_I32_WITH_RM32, MODRM_R64(7) | MODRM_RM_REG | MODRM_RM_R64(src_r32));
asm_x64_write_word32(as, src_i32);
}
}
*/
void asm_x64_test_r8_with_r8(asm_x64_t *as, int src_r64_a, int src_r64_b) {
// TODO implement for other registers
assert(src_r64_a == ASM_X64_REG_RAX);
assert(src_r64_b == ASM_X64_REG_RAX);
asm_x64_write_byte_2(as, OPCODE_TEST_R8_WITH_RM8, MODRM_R64(src_r64_a) | MODRM_RM_REG | MODRM_RM_R64(src_r64_b));
}
void asm_x64_test_r64_with_r64(asm_x64_t *as, int src_r64_a, int src_r64_b) {
asm_x64_generic_r64_r64(as, src_r64_b, src_r64_a, OPCODE_TEST_R64_WITH_RM64);
}
void asm_x64_setcc_r8(asm_x64_t *as, int jcc_type, int dest_r8) {
assert(dest_r8 < 8);
asm_x64_write_byte_3(as, OPCODE_SETCC_RM8_A, OPCODE_SETCC_RM8_B | jcc_type, MODRM_R64(0) | MODRM_RM_REG | MODRM_RM_R64(dest_r8));
}
STATIC mp_uint_t get_label_dest(asm_x64_t *as, mp_uint_t label) {
assert(label < as->base.max_num_labels);
return as->base.label_offsets[label];
}
void asm_x64_jmp_label(asm_x64_t *as, mp_uint_t label) {
mp_uint_t dest = get_label_dest(as, label);
mp_int_t rel = dest - as->base.code_offset;
if (dest != (mp_uint_t)-1 && rel < 0) {
// is a backwards jump, so we know the size of the jump on the first pass
// calculate rel assuming 8 bit relative jump
rel -= 2;
if (SIGNED_FIT8(rel)) {
asm_x64_write_byte_2(as, OPCODE_JMP_REL8, rel & 0xff);
} else {
rel += 2;
goto large_jump;
}
} else {
// is a forwards jump, so need to assume it's large
large_jump:
rel -= 5;
asm_x64_write_byte_1(as, OPCODE_JMP_REL32);
asm_x64_write_word32(as, rel);
}
}
void asm_x64_jcc_label(asm_x64_t *as, int jcc_type, mp_uint_t label) {
mp_uint_t dest = get_label_dest(as, label);
mp_int_t rel = dest - as->base.code_offset;
if (dest != (mp_uint_t)-1 && rel < 0) {
// is a backwards jump, so we know the size of the jump on the first pass
// calculate rel assuming 8 bit relative jump
rel -= 2;
if (SIGNED_FIT8(rel)) {
asm_x64_write_byte_2(as, OPCODE_JCC_REL8 | jcc_type, rel & 0xff);
} else {
rel += 2;
goto large_jump;
}
} else {
// is a forwards jump, so need to assume it's large
large_jump:
rel -= 6;
asm_x64_write_byte_2(as, OPCODE_JCC_REL32_A, OPCODE_JCC_REL32_B | jcc_type);
asm_x64_write_word32(as, rel);
}
}
void asm_x64_entry(asm_x64_t *as, int num_locals) {
assert(num_locals >= 0);
asm_x64_push_r64(as, ASM_X64_REG_RBP);
asm_x64_mov_r64_r64(as, ASM_X64_REG_RBP, ASM_X64_REG_RSP);
num_locals |= 1; // make it odd so stack is aligned on 16 byte boundary
asm_x64_sub_r64_i32(as, ASM_X64_REG_RSP, num_locals * WORD_SIZE);
asm_x64_push_r64(as, ASM_X64_REG_RBX);
asm_x64_push_r64(as, ASM_X64_REG_R12);
asm_x64_push_r64(as, ASM_X64_REG_R13);
as->num_locals = num_locals;
}
void asm_x64_exit(asm_x64_t *as) {
asm_x64_pop_r64(as, ASM_X64_REG_R13);
asm_x64_pop_r64(as, ASM_X64_REG_R12);
asm_x64_pop_r64(as, ASM_X64_REG_RBX);
asm_x64_write_byte_1(as, OPCODE_LEAVE);
asm_x64_ret(as);
}
// locals:
// - stored on the stack in ascending order
// - numbered 0 through as->num_locals-1
// - RBP points above the last local
//
// | RBP
// v
// l0 l1 l2 ... l(n-1)
// ^ ^
// | low address | high address in RAM
//
STATIC int asm_x64_local_offset_from_ebp(asm_x64_t *as, int local_num) {
return (-as->num_locals + local_num) * WORD_SIZE;
}
void asm_x64_mov_local_to_r64(asm_x64_t *as, int src_local_num, int dest_r64) {
asm_x64_mov_mem64_to_r64(as, ASM_X64_REG_RBP, asm_x64_local_offset_from_ebp(as, src_local_num), dest_r64);
}
void asm_x64_mov_r64_to_local(asm_x64_t *as, int src_r64, int dest_local_num) {
asm_x64_mov_r64_to_mem64(as, src_r64, ASM_X64_REG_RBP, asm_x64_local_offset_from_ebp(as, dest_local_num));
}
void asm_x64_mov_local_addr_to_r64(asm_x64_t *as, int local_num, int dest_r64) {
int offset = asm_x64_local_offset_from_ebp(as, local_num);
if (offset == 0) {
asm_x64_mov_r64_r64(as, dest_r64, ASM_X64_REG_RBP);
} else {
asm_x64_lea_disp_to_r64(as, ASM_X64_REG_RBP, offset, dest_r64);
}
}
/*
void asm_x64_push_local(asm_x64_t *as, int local_num) {
asm_x64_push_disp(as, ASM_X64_REG_RBP, asm_x64_local_offset_from_ebp(as, local_num));
}
void asm_x64_push_local_addr(asm_x64_t *as, int local_num, int temp_r64) {
asm_x64_mov_r64_r64(as, temp_r64, ASM_X64_REG_RBP);
asm_x64_add_i32_to_r32(as, asm_x64_local_offset_from_ebp(as, local_num), temp_r64);
asm_x64_push_r64(as, temp_r64);
}
*/
/*
can't use these because code might be relocated when resized
void asm_x64_call(asm_x64_t *as, void* func) {
asm_x64_sub_i32_from_r32(as, 8, ASM_X64_REG_RSP);
asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
asm_x64_write_word32(as, func - (void*)(as->code_cur + 4));
asm_x64_mov_r64_r64(as, ASM_X64_REG_RSP, ASM_X64_REG_RBP);
}
void asm_x64_call_i1(asm_x64_t *as, void* func, int i1) {
asm_x64_sub_i32_from_r32(as, 8, ASM_X64_REG_RSP);
asm_x64_sub_i32_from_r32(as, 12, ASM_X64_REG_RSP);
asm_x64_push_i32(as, i1);
asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
asm_x64_write_word32(as, func - (void*)(as->code_cur + 4));
asm_x64_add_i32_to_r32(as, 16, ASM_X64_REG_RSP);
asm_x64_mov_r64_r64(as, ASM_X64_REG_RSP, ASM_X64_REG_RBP);
}
*/
void asm_x64_call_ind(asm_x64_t *as, void *ptr, int temp_r64) {
assert(temp_r64 < 8);
#ifdef __LP64__
asm_x64_mov_i64_to_r64_optimised(as, (int64_t)ptr, temp_r64);
#else
// If we get here, sizeof(int) == sizeof(void*).
asm_x64_mov_i64_to_r64_optimised(as, (int64_t)(unsigned int)ptr, temp_r64);
#endif
asm_x64_write_byte_2(as, OPCODE_CALL_RM32, MODRM_R64(2) | MODRM_RM_REG | MODRM_RM_R64(temp_r64));
// this reduces code size by 2 bytes per call, but doesn't seem to speed it up at all
// doesn't work anymore because calls are 64 bits away
/*
asm_x64_write_byte_1(as, OPCODE_CALL_REL32);
asm_x64_write_word32(as, ptr - (void*)(as->code_base + as->code_offset + 4));
*/
}
#endif // MICROPY_EMIT_X64
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