kopia lustrzana https://github.com/micropython/micropython
513 wiersze
18 KiB
C
513 wiersze
18 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include "py/mpconfig.h"
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// wrapper around everything in this file
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#if MICROPY_EMIT_X86
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#include "py/asmx86.h"
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/* all offsets are measured in multiples of 4 bytes */
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#define WORD_SIZE (4)
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#define OPCODE_NOP (0x90)
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#define OPCODE_PUSH_R32 (0x50)
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//#define OPCODE_PUSH_I32 (0x68)
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//#define OPCODE_PUSH_M32 (0xff) /* /6 */
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#define OPCODE_POP_R32 (0x58)
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#define OPCODE_RET (0xc3)
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//#define OPCODE_MOV_I8_TO_R8 (0xb0) /* +rb */
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#define OPCODE_MOV_I32_TO_R32 (0xb8)
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//#define OPCODE_MOV_I32_TO_RM32 (0xc7)
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#define OPCODE_MOV_R8_TO_RM8 (0x88) /* /r */
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#define OPCODE_MOV_R32_TO_RM32 (0x89) /* /r */
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#define OPCODE_MOV_RM32_TO_R32 (0x8b) /* /r */
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#define OPCODE_MOVZX_RM8_TO_R32 (0xb6) /* 0x0f 0xb6/r */
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#define OPCODE_MOVZX_RM16_TO_R32 (0xb7) /* 0x0f 0xb7/r */
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#define OPCODE_LEA_MEM_TO_R32 (0x8d) /* /r */
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#define OPCODE_AND_R32_TO_RM32 (0x21) /* /r */
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#define OPCODE_OR_R32_TO_RM32 (0x09) /* /r */
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#define OPCODE_XOR_R32_TO_RM32 (0x31) /* /r */
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#define OPCODE_ADD_R32_TO_RM32 (0x01)
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#define OPCODE_ADD_I32_TO_RM32 (0x81) /* /0 */
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#define OPCODE_ADD_I8_TO_RM32 (0x83) /* /0 */
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#define OPCODE_SUB_R32_FROM_RM32 (0x29)
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#define OPCODE_SUB_I32_FROM_RM32 (0x81) /* /5 */
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#define OPCODE_SUB_I8_FROM_RM32 (0x83) /* /5 */
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//#define OPCODE_SHL_RM32_BY_I8 (0xc1) /* /4 */
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//#define OPCODE_SHR_RM32_BY_I8 (0xc1) /* /5 */
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//#define OPCODE_SAR_RM32_BY_I8 (0xc1) /* /7 */
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#define OPCODE_SHL_RM32_CL (0xd3) /* /4 */
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#define OPCODE_SAR_RM32_CL (0xd3) /* /7 */
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//#define OPCODE_CMP_I32_WITH_RM32 (0x81) /* /7 */
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//#define OPCODE_CMP_I8_WITH_RM32 (0x83) /* /7 */
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#define OPCODE_CMP_R32_WITH_RM32 (0x39)
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//#define OPCODE_CMP_RM32_WITH_R32 (0x3b)
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#define OPCODE_TEST_R8_WITH_RM8 (0x84) /* /r */
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#define OPCODE_JMP_REL8 (0xeb)
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#define OPCODE_JMP_REL32 (0xe9)
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#define OPCODE_JCC_REL8 (0x70) /* | jcc type */
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#define OPCODE_JCC_REL32_A (0x0f)
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#define OPCODE_JCC_REL32_B (0x80) /* | jcc type */
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#define OPCODE_SETCC_RM8_A (0x0f)
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#define OPCODE_SETCC_RM8_B (0x90) /* | jcc type, /0 */
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#define OPCODE_CALL_REL32 (0xe8)
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#define OPCODE_CALL_RM32 (0xff) /* /2 */
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#define OPCODE_LEAVE (0xc9)
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#define MODRM_R32(x) ((x) << 3)
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#define MODRM_RM_DISP0 (0x00)
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#define MODRM_RM_DISP8 (0x40)
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#define MODRM_RM_DISP32 (0x80)
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#define MODRM_RM_REG (0xc0)
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#define MODRM_RM_R32(x) (x)
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#define OP_SIZE_PREFIX (0x66)
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#define IMM32_L0(x) ((x) & 0xff)
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#define IMM32_L1(x) (((x) >> 8) & 0xff)
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#define IMM32_L2(x) (((x) >> 16) & 0xff)
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#define IMM32_L3(x) (((x) >> 24) & 0xff)
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#define SIGNED_FIT8(x) (((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)
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STATIC void asm_x86_write_byte_1(asm_x86_t *as, byte b1) {
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byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 1);
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if (c != NULL) {
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c[0] = b1;
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}
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}
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STATIC void asm_x86_write_byte_2(asm_x86_t *as, byte b1, byte b2) {
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byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 2);
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if (c != NULL) {
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c[0] = b1;
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c[1] = b2;
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}
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}
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STATIC void asm_x86_write_byte_3(asm_x86_t *as, byte b1, byte b2, byte b3) {
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byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 3);
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if (c != NULL) {
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c[0] = b1;
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c[1] = b2;
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c[2] = b3;
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}
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}
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STATIC void asm_x86_write_word32(asm_x86_t *as, int w32) {
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byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 4);
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if (c != NULL) {
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c[0] = IMM32_L0(w32);
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c[1] = IMM32_L1(w32);
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c[2] = IMM32_L2(w32);
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c[3] = IMM32_L3(w32);
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}
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}
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STATIC void asm_x86_write_r32_disp(asm_x86_t *as, int r32, int disp_r32, int disp_offset) {
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assert(disp_r32 != ASM_X86_REG_ESP);
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if (disp_offset == 0 && disp_r32 != ASM_X86_REG_EBP) {
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asm_x86_write_byte_1(as, MODRM_R32(r32) | MODRM_RM_DISP0 | MODRM_RM_R32(disp_r32));
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} else if (SIGNED_FIT8(disp_offset)) {
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asm_x86_write_byte_2(as, MODRM_R32(r32) | MODRM_RM_DISP8 | MODRM_RM_R32(disp_r32), IMM32_L0(disp_offset));
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} else {
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asm_x86_write_byte_1(as, MODRM_R32(r32) | MODRM_RM_DISP32 | MODRM_RM_R32(disp_r32));
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asm_x86_write_word32(as, disp_offset);
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}
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}
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STATIC void asm_x86_generic_r32_r32(asm_x86_t *as, int dest_r32, int src_r32, int op) {
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asm_x86_write_byte_2(as, op, MODRM_R32(src_r32) | MODRM_RM_REG | MODRM_RM_R32(dest_r32));
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}
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STATIC void asm_x86_nop(asm_x86_t *as) {
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asm_x86_write_byte_1(as, OPCODE_NOP);
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}
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STATIC void asm_x86_push_r32(asm_x86_t *as, int src_r32) {
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asm_x86_write_byte_1(as, OPCODE_PUSH_R32 | src_r32);
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}
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#if 0
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void asm_x86_push_i32(asm_x86_t *as, int src_i32) {
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asm_x86_write_byte_1(as, OPCODE_PUSH_I32);
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asm_x86_write_word32(as, src_i32);
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}
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void asm_x86_push_disp(asm_x86_t *as, int src_r32, int src_offset) {
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asm_x86_write_byte_1(as, OPCODE_PUSH_M32);
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asm_x86_write_r32_disp(as, 6, src_r32, src_offset);
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}
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#endif
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STATIC void asm_x86_pop_r32(asm_x86_t *as, int dest_r32) {
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asm_x86_write_byte_1(as, OPCODE_POP_R32 | dest_r32);
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}
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STATIC void asm_x86_ret(asm_x86_t *as) {
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asm_x86_write_byte_1(as, OPCODE_RET);
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}
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void asm_x86_mov_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_MOV_R32_TO_RM32);
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}
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void asm_x86_mov_r8_to_mem8(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
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asm_x86_write_byte_1(as, OPCODE_MOV_R8_TO_RM8);
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asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
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}
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void asm_x86_mov_r16_to_mem16(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
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asm_x86_write_byte_2(as, OP_SIZE_PREFIX, OPCODE_MOV_R32_TO_RM32);
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asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
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}
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void asm_x86_mov_r32_to_mem32(asm_x86_t *as, int src_r32, int dest_r32, int dest_disp) {
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asm_x86_write_byte_1(as, OPCODE_MOV_R32_TO_RM32);
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asm_x86_write_r32_disp(as, src_r32, dest_r32, dest_disp);
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}
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void asm_x86_mov_mem8_to_r32zx(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
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asm_x86_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM8_TO_R32);
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asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
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}
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void asm_x86_mov_mem16_to_r32zx(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
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asm_x86_write_byte_2(as, 0x0f, OPCODE_MOVZX_RM16_TO_R32);
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asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
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}
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void asm_x86_mov_mem32_to_r32(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
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asm_x86_write_byte_1(as, OPCODE_MOV_RM32_TO_R32);
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asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
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}
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STATIC void asm_x86_lea_disp_to_r32(asm_x86_t *as, int src_r32, int src_disp, int dest_r32) {
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asm_x86_write_byte_1(as, OPCODE_LEA_MEM_TO_R32);
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asm_x86_write_r32_disp(as, dest_r32, src_r32, src_disp);
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}
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#if 0
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void asm_x86_mov_i8_to_r8(asm_x86_t *as, int src_i8, int dest_r32) {
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asm_x86_write_byte_2(as, OPCODE_MOV_I8_TO_R8 | dest_r32, src_i8);
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}
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#endif
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void asm_x86_mov_i32_to_r32(asm_x86_t *as, int32_t src_i32, int dest_r32) {
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asm_x86_write_byte_1(as, OPCODE_MOV_I32_TO_R32 | dest_r32);
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asm_x86_write_word32(as, src_i32);
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}
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// src_i32 is stored as a full word in the code, and aligned to machine-word boundary
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void asm_x86_mov_i32_to_r32_aligned(asm_x86_t *as, int32_t src_i32, int dest_r32) {
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// mov instruction uses 1 byte for the instruction, before the i32
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while (((as->base.code_offset + 1) & (WORD_SIZE - 1)) != 0) {
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asm_x86_nop(as);
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}
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asm_x86_mov_i32_to_r32(as, src_i32, dest_r32);
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}
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void asm_x86_and_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_AND_R32_TO_RM32);
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}
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void asm_x86_or_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_OR_R32_TO_RM32);
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}
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void asm_x86_xor_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_XOR_R32_TO_RM32);
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}
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void asm_x86_shl_r32_cl(asm_x86_t* as, int dest_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, 4, OPCODE_SHL_RM32_CL);
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}
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void asm_x86_sar_r32_cl(asm_x86_t* as, int dest_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, 7, OPCODE_SAR_RM32_CL);
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}
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void asm_x86_add_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_ADD_R32_TO_RM32);
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}
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STATIC void asm_x86_add_i32_to_r32(asm_x86_t *as, int src_i32, int dest_r32) {
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if (SIGNED_FIT8(src_i32)) {
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asm_x86_write_byte_2(as, OPCODE_ADD_I8_TO_RM32, MODRM_R32(0) | MODRM_RM_REG | MODRM_RM_R32(dest_r32));
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asm_x86_write_byte_1(as, src_i32 & 0xff);
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} else {
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asm_x86_write_byte_2(as, OPCODE_ADD_I32_TO_RM32, MODRM_R32(0) | MODRM_RM_REG | MODRM_RM_R32(dest_r32));
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asm_x86_write_word32(as, src_i32);
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}
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}
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void asm_x86_sub_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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asm_x86_generic_r32_r32(as, dest_r32, src_r32, OPCODE_SUB_R32_FROM_RM32);
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}
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STATIC void asm_x86_sub_r32_i32(asm_x86_t *as, int dest_r32, int src_i32) {
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if (SIGNED_FIT8(src_i32)) {
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// defaults to 32 bit operation
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asm_x86_write_byte_2(as, OPCODE_SUB_I8_FROM_RM32, MODRM_R32(5) | MODRM_RM_REG | MODRM_RM_R32(dest_r32));
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asm_x86_write_byte_1(as, src_i32 & 0xff);
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} else {
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// defaults to 32 bit operation
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asm_x86_write_byte_2(as, OPCODE_SUB_I32_FROM_RM32, MODRM_R32(5) | MODRM_RM_REG | MODRM_RM_R32(dest_r32));
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asm_x86_write_word32(as, src_i32);
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}
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}
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void asm_x86_mul_r32_r32(asm_x86_t *as, int dest_r32, int src_r32) {
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// imul reg32, reg/mem32 -- 0x0f 0xaf /r
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asm_x86_write_byte_3(as, 0x0f, 0xaf, MODRM_R32(dest_r32) | MODRM_RM_REG | MODRM_RM_R32(src_r32));
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}
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#if 0
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/* shifts not tested */
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void asm_x86_shl_r32_by_imm(asm_x86_t *as, int r32, int imm) {
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asm_x86_write_byte_2(as, OPCODE_SHL_RM32_BY_I8, MODRM_R32(4) | MODRM_RM_REG | MODRM_RM_R32(r32));
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asm_x86_write_byte_1(as, imm);
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}
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void asm_x86_shr_r32_by_imm(asm_x86_t *as, int r32, int imm) {
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asm_x86_write_byte_2(as, OPCODE_SHR_RM32_BY_I8, MODRM_R32(5) | MODRM_RM_REG | MODRM_RM_R32(r32));
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asm_x86_write_byte_1(as, imm);
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}
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void asm_x86_sar_r32_by_imm(asm_x86_t *as, int r32, int imm) {
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asm_x86_write_byte_2(as, OPCODE_SAR_RM32_BY_I8, MODRM_R32(7) | MODRM_RM_REG | MODRM_RM_R32(r32));
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asm_x86_write_byte_1(as, imm);
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}
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#endif
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void asm_x86_cmp_r32_with_r32(asm_x86_t *as, int src_r32_a, int src_r32_b) {
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asm_x86_write_byte_2(as, OPCODE_CMP_R32_WITH_RM32, MODRM_R32(src_r32_a) | MODRM_RM_REG | MODRM_RM_R32(src_r32_b));
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}
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#if 0
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void asm_x86_cmp_i32_with_r32(asm_x86_t *as, int src_i32, int src_r32) {
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if (SIGNED_FIT8(src_i32)) {
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asm_x86_write_byte_2(as, OPCODE_CMP_I8_WITH_RM32, MODRM_R32(7) | MODRM_RM_REG | MODRM_RM_R32(src_r32));
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asm_x86_write_byte_1(as, src_i32 & 0xff);
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} else {
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asm_x86_write_byte_2(as, OPCODE_CMP_I32_WITH_RM32, MODRM_R32(7) | MODRM_RM_REG | MODRM_RM_R32(src_r32));
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asm_x86_write_word32(as, src_i32);
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}
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}
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#endif
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void asm_x86_test_r8_with_r8(asm_x86_t *as, int src_r32_a, int src_r32_b) {
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// TODO implement for other registers
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assert(src_r32_a == ASM_X86_REG_EAX);
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assert(src_r32_b == ASM_X86_REG_EAX);
|
|
asm_x86_write_byte_2(as, OPCODE_TEST_R8_WITH_RM8, MODRM_R32(src_r32_a) | MODRM_RM_REG | MODRM_RM_R32(src_r32_b));
|
|
}
|
|
|
|
void asm_x86_setcc_r8(asm_x86_t *as, mp_uint_t jcc_type, int dest_r8) {
|
|
asm_x86_write_byte_3(as, OPCODE_SETCC_RM8_A, OPCODE_SETCC_RM8_B | jcc_type, MODRM_R32(0) | MODRM_RM_REG | MODRM_RM_R32(dest_r8));
|
|
}
|
|
|
|
STATIC mp_uint_t get_label_dest(asm_x86_t *as, mp_uint_t label) {
|
|
assert(label < as->base.max_num_labels);
|
|
return as->base.label_offsets[label];
|
|
}
|
|
|
|
void asm_x86_jmp_label(asm_x86_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_x86_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_x86_write_byte_1(as, OPCODE_JMP_REL32);
|
|
asm_x86_write_word32(as, rel);
|
|
}
|
|
}
|
|
|
|
void asm_x86_jcc_label(asm_x86_t *as, mp_uint_t 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_x86_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_x86_write_byte_2(as, OPCODE_JCC_REL32_A, OPCODE_JCC_REL32_B | jcc_type);
|
|
asm_x86_write_word32(as, rel);
|
|
}
|
|
}
|
|
|
|
void asm_x86_entry(asm_x86_t *as, int num_locals) {
|
|
assert(num_locals >= 0);
|
|
asm_x86_push_r32(as, ASM_X86_REG_EBP);
|
|
asm_x86_mov_r32_r32(as, ASM_X86_REG_EBP, ASM_X86_REG_ESP);
|
|
if (num_locals > 0) {
|
|
asm_x86_sub_r32_i32(as, ASM_X86_REG_ESP, num_locals * WORD_SIZE);
|
|
}
|
|
asm_x86_push_r32(as, ASM_X86_REG_EBX);
|
|
asm_x86_push_r32(as, ASM_X86_REG_ESI);
|
|
asm_x86_push_r32(as, ASM_X86_REG_EDI);
|
|
// TODO align stack on 16-byte boundary
|
|
as->num_locals = num_locals;
|
|
}
|
|
|
|
void asm_x86_exit(asm_x86_t *as) {
|
|
asm_x86_pop_r32(as, ASM_X86_REG_EDI);
|
|
asm_x86_pop_r32(as, ASM_X86_REG_ESI);
|
|
asm_x86_pop_r32(as, ASM_X86_REG_EBX);
|
|
asm_x86_write_byte_1(as, OPCODE_LEAVE);
|
|
asm_x86_ret(as);
|
|
}
|
|
|
|
#if 0
|
|
void asm_x86_push_arg(asm_x86_t *as, int src_arg_num) {
|
|
asm_x86_push_disp(as, ASM_X86_REG_EBP, 2 * WORD_SIZE + src_arg_num * WORD_SIZE);
|
|
}
|
|
#endif
|
|
|
|
void asm_x86_mov_arg_to_r32(asm_x86_t *as, int src_arg_num, int dest_r32) {
|
|
asm_x86_mov_mem32_to_r32(as, ASM_X86_REG_EBP, 2 * WORD_SIZE + src_arg_num * WORD_SIZE, dest_r32);
|
|
}
|
|
|
|
#if 0
|
|
void asm_x86_mov_r32_to_arg(asm_x86_t *as, int src_r32, int dest_arg_num) {
|
|
asm_x86_mov_r32_to_mem32(as, src_r32, ASM_X86_REG_EBP, 2 * WORD_SIZE + dest_arg_num * WORD_SIZE);
|
|
}
|
|
#endif
|
|
|
|
// locals:
|
|
// - stored on the stack in ascending order
|
|
// - numbered 0 through as->num_locals-1
|
|
// - EBP points above the last local
|
|
//
|
|
// | EBP
|
|
// v
|
|
// l0 l1 l2 ... l(n-1)
|
|
// ^ ^
|
|
// | low address | high address in RAM
|
|
//
|
|
STATIC int asm_x86_local_offset_from_ebp(asm_x86_t *as, int local_num) {
|
|
return (-as->num_locals + local_num) * WORD_SIZE;
|
|
}
|
|
|
|
void asm_x86_mov_local_to_r32(asm_x86_t *as, int src_local_num, int dest_r32) {
|
|
asm_x86_mov_mem32_to_r32(as, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, src_local_num), dest_r32);
|
|
}
|
|
|
|
void asm_x86_mov_r32_to_local(asm_x86_t *as, int src_r32, int dest_local_num) {
|
|
asm_x86_mov_r32_to_mem32(as, src_r32, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, dest_local_num));
|
|
}
|
|
|
|
void asm_x86_mov_local_addr_to_r32(asm_x86_t *as, int local_num, int dest_r32) {
|
|
int offset = asm_x86_local_offset_from_ebp(as, local_num);
|
|
if (offset == 0) {
|
|
asm_x86_mov_r32_r32(as, dest_r32, ASM_X86_REG_EBP);
|
|
} else {
|
|
asm_x86_lea_disp_to_r32(as, ASM_X86_REG_EBP, offset, dest_r32);
|
|
}
|
|
}
|
|
|
|
#if 0
|
|
void asm_x86_push_local(asm_x86_t *as, int local_num) {
|
|
asm_x86_push_disp(as, ASM_X86_REG_EBP, asm_x86_local_offset_from_ebp(as, local_num));
|
|
}
|
|
|
|
void asm_x86_push_local_addr(asm_x86_t *as, int local_num, int temp_r32)
|
|
{
|
|
asm_x86_mov_r32_r32(as, temp_r32, ASM_X86_REG_EBP);
|
|
asm_x86_add_i32_to_r32(as, asm_x86_local_offset_from_ebp(as, local_num), temp_r32);
|
|
asm_x86_push_r32(as, temp_r32);
|
|
}
|
|
#endif
|
|
|
|
void asm_x86_call_ind(asm_x86_t *as, void *ptr, mp_uint_t n_args, int temp_r32) {
|
|
// TODO align stack on 16-byte boundary before the call
|
|
assert(n_args <= 5);
|
|
if (n_args > 4) {
|
|
asm_x86_push_r32(as, ASM_X86_REG_ARG_5);
|
|
}
|
|
if (n_args > 3) {
|
|
asm_x86_push_r32(as, ASM_X86_REG_ARG_4);
|
|
}
|
|
if (n_args > 2) {
|
|
asm_x86_push_r32(as, ASM_X86_REG_ARG_3);
|
|
}
|
|
if (n_args > 1) {
|
|
asm_x86_push_r32(as, ASM_X86_REG_ARG_2);
|
|
}
|
|
if (n_args > 0) {
|
|
asm_x86_push_r32(as, ASM_X86_REG_ARG_1);
|
|
}
|
|
#ifdef __LP64__
|
|
// We wouldn't run x86 code on an x64 machine. This is here to enable
|
|
// testing of the x86 emitter only.
|
|
asm_x86_mov_i32_to_r32(as, (int32_t)(int64_t)ptr, temp_r32);
|
|
#else
|
|
// If we get here, sizeof(int) == sizeof(void*).
|
|
asm_x86_mov_i32_to_r32(as, (int32_t)ptr, temp_r32);
|
|
#endif
|
|
asm_x86_write_byte_2(as, OPCODE_CALL_RM32, MODRM_R32(2) | MODRM_RM_REG | MODRM_RM_R32(temp_r32));
|
|
// this reduces code size by 2 bytes per call, but doesn't seem to speed it up at all
|
|
/*
|
|
asm_x86_write_byte_1(as, OPCODE_CALL_REL32);
|
|
asm_x86_write_word32(as, ptr - (void*)(as->code_base + as->base.code_offset + 4));
|
|
*/
|
|
|
|
// the caller must clean up the stack
|
|
if (n_args > 0) {
|
|
asm_x86_add_i32_to_r32(as, WORD_SIZE * n_args, ASM_X86_REG_ESP);
|
|
}
|
|
}
|
|
|
|
#endif // MICROPY_EMIT_X86
|