v86/src/memory.js

"use strict";


CPU.prototype.mmap_read8 = function(addr)
{
    const value = this.memory_map_read8[addr >>> MMAP_BLOCK_BITS](addr);
    dbg_assert(value >= 0 && value <= 0xFF);
    return value;
};

CPU.prototype.mmap_write8 = function(addr, value)
{
    dbg_assert(value >= 0 && value <= 0xFF);
    this.memory_map_write8[addr >>> MMAP_BLOCK_BITS](addr, value);
};

CPU.prototype.mmap_read16 = function(addr)
{
    var fn = this.memory_map_read8[addr >>> MMAP_BLOCK_BITS];
    const value = fn(addr) | fn(addr + 1 | 0) << 8;
    dbg_assert(value >= 0 && value <= 0xFFFF);
    return value;
};

CPU.prototype.mmap_write16 = function(addr, value)
{
    var fn = this.memory_map_write8[addr >>> MMAP_BLOCK_BITS];

    dbg_assert(value >= 0 && value <= 0xFFFF);
    fn(addr, value & 0xFF);
    fn(addr + 1 | 0, value >> 8);
};

CPU.prototype.mmap_read32 = function(addr)
{
    var aligned_addr = addr >>> MMAP_BLOCK_BITS;

    return this.memory_map_read32[aligned_addr](addr);
};

CPU.prototype.mmap_write32 = function(addr, value)
{
    var aligned_addr = addr >>> MMAP_BLOCK_BITS;

    this.memory_map_write32[aligned_addr](addr, value);
};

CPU.prototype.mmap_write64 = function(addr, value0, value1)
{
    var aligned_addr = addr >>> MMAP_BLOCK_BITS;
    // This should hold since writes across pages are split up
    dbg_assert(aligned_addr === (addr + 7) >>> MMAP_BLOCK_BITS);

    var write_func32 = this.memory_map_write32[aligned_addr];
    write_func32(addr, value0);
    write_func32(addr + 4, value1);
};

CPU.prototype.mmap_write128 = function(addr, value0, value1, value2, value3)
{
    var aligned_addr = addr >>> MMAP_BLOCK_BITS;
    // This should hold since writes across pages are split up
    dbg_assert(aligned_addr === (addr + 12) >>> MMAP_BLOCK_BITS);

    var write_func32 = this.memory_map_write32[aligned_addr];
    write_func32(addr, value0);
    write_func32(addr + 4, value1);
    write_func32(addr + 8, value2);
    write_func32(addr + 12, value3);
};

/**
 * @param {Array.<number>|Uint8Array} blob
 * @param {number} offset
 */
CPU.prototype.write_blob = function(blob, offset)
{
    dbg_assert(blob && blob.length >= 0);

    if(blob.length)
    {
        dbg_assert(!this.in_mapped_range(offset));
        dbg_assert(!this.in_mapped_range(offset + blob.length - 1));

        this.jit_dirty_cache(offset, offset + blob.length);
        this.mem8.set(blob, offset);
    }
};

CPU.prototype.read_blob = function(offset, length)
{
    if(length)
    {
        dbg_assert(!this.in_mapped_range(offset));
        dbg_assert(!this.in_mapped_range(offset + length - 1));
    }
    return this.mem8.subarray(offset, offset + length);
};