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port cmpsb

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This commit is contained in:
Awal Garg 2017-07-30 18:32:11 +05:30 committed by Fabian
parent 9a8c91e1a1
commit c68e68a04f
3 changed files with 71 additions and 1 deletions
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1
src/browser/starter.js
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@ -200,7 +200,6 @@ function V86Starter(options)
"_outsb": function() { return cpu.outsb.apply(cpu, arguments); },
"_outsw": function() { return cpu.outsw.apply(cpu, arguments); },
"_outsd": function() { return cpu.outsd.apply(cpu, arguments); },
"_cmpsb": function() { return cpu.cmpsb.apply(cpu, arguments); },
"_cmpsw": function() { return cpu.cmpsw.apply(cpu, arguments); },
"_cmpsd": function() { return cpu.cmpsd.apply(cpu, arguments); },
"_stosb": function() { return cpu.stosb.apply(cpu, arguments); },

1
src/cpu.js
View file

@ -350,6 +350,7 @@ CPU.prototype.wasm_patch = function(wm)
this.movsb = this.wm.funcs['_movsb'];
this.movsw = this.wm.funcs['_movsw'];
this.movsd = this.wm.funcs['_movsd'];
this.cmpsb = this.wm.funcs['_cmpsb'];
};
CPU.prototype.get_state = function()

70
src/native/string.c
View file

@ -240,3 +240,73 @@ void movsd()
}
}
void cmpsb_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t dest = get_seg(ES) + get_reg_asize(EDI);
int32_t data_src, data_dest;
int32_t size = *flags & FLAG_DIRECTION ? -1 : 1;
int32_t count = get_reg_asize(ECX) >> 0;
if(count == 0) return;
int32_t cont = false;
int32_t start_count = count;
int32_t is_repz = (*prefixes & PREFIX_MASK_REP) == PREFIX_REPZ;
int32_t cycle_counter = MAX_COUNT_PER_CYCLE;
int32_t phys_src = translate_address_read(src);
int32_t phys_dest = translate_address_read(dest);
if(*paging)
{
cycle_counter = string_get_cycle_count2(size, src, dest);
}
do
{
data_dest = read8(phys_dest);
data_src = read8(phys_src);
phys_dest += size;
phys_src += size;
cont = --count != 0 && (data_src == data_dest) == is_repz;
}
while(cont && cycle_counter--);
int32_t diff = size * (start_count - count);
add_reg_asize(EDI, diff);
add_reg_asize(ESI, diff);
set_ecx_asize(count);
*timestamp_counter += start_count - count;
if(cont)
{
*instruction_pointer = *previous_ip;
}
cmp8(data_src, data_dest);
diverged();
}
void cmpsb_no_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t dest = get_seg(ES) + get_reg_asize(EDI);
int32_t data_src, data_dest;
int32_t size = *flags & FLAG_DIRECTION ? -1 : 1;
data_src = safe_read8(src);
data_dest = safe_read8(dest);
add_reg_asize(EDI, size);
add_reg_asize(ESI, size);
cmp8(data_src, data_dest);
diverged();
}
void cmpsb()
{
if(*prefixes & PREFIX_MASK_REP)
{
cmpsb_rep();
}
else
{
cmpsb_no_rep();
}
}