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Refactor to safely write 64 bits (accounting for page fault exceptions)

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This commit is contained in:
Amaan Cheval 2017-05-05 10:52:56 +05:30 committed by Fabian
parent a87fba744b
commit 337173963f
1 changed files with 8 additions and 2 deletions
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10
src/cpu.js
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@ -1522,6 +1522,13 @@ CPU.prototype.safe_write32 = function(addr, value)
}
};
CPU.prototype.safe_write64 = function(addr, low, high)
{
this.writable_or_pagefault(addr, 8);
this.safe_write32(addr, low);
this.safe_write32(addr + 4 | 0, high);
};
// read 2 or 4 byte from ip, depending on address size attribute
CPU.prototype.read_moffs = function()
{
@ -3296,8 +3303,7 @@ CPU.prototype.set_xmm_mem64s = function(data) {
if(this.modrm_byte < 0xC0) {
var addr = this.modrm_resolve(this.modrm_byte);
this.safe_write32(addr, data.lo);
this.safe_write32(addr + 4 | 0, data.hi);
this.safe_write64(addr, data.lo, data.hi);
} else {
this.reg_mmxs[2 * (this.modrm_byte & 7)] = data.lo;
this.reg_mmxs[2 * (this.modrm_byte & 7) + 1] = data.hi;