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port cmpsw

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This commit is contained in:
Awal Garg 2017-07-30 18:32:54 +05:30 committed by Fabian
parent c68e68a04f
commit 39ede470ed
3 changed files with 89 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); },
"_cmpsw": function() { return cpu.cmpsw.apply(cpu, arguments); },
"_cmpsd": function() { return cpu.cmpsd.apply(cpu, arguments); },
"_stosb": function() { return cpu.stosb.apply(cpu, arguments); },
"_stosw": function() { return cpu.stosw.apply(cpu, arguments); },

1
src/cpu.js
View file

@ -351,6 +351,7 @@ CPU.prototype.wasm_patch = function(wm)
this.movsw = this.wm.funcs['_movsw'];
this.movsd = this.wm.funcs['_movsd'];
this.cmpsb = this.wm.funcs['_cmpsb'];
this.cmpsw = this.wm.funcs['_cmpsw'];
};
CPU.prototype.get_state = function()

88
src/native/string.c
View file

@ -310,3 +310,91 @@ void cmpsb()
}
}
void cmpsw_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 ? -2 : 2;
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;
if(!(dest & 1) && !(src & 1))
{
int32_t single_size = size < 0 ? -1 : 1;
int32_t phys_src = translate_address_read(src) >> 1;
int32_t phys_dest = translate_address_read(dest) >> 1;
if(*paging)
{
cycle_counter = string_get_cycle_count2(size, src, dest);
}
do
{
data_dest = read_aligned16(phys_dest);
data_src = read_aligned16(phys_src);
phys_dest += single_size;
phys_src += single_size;
cont = --count != 0 && (data_src == data_dest) == is_repz;
}
while(cont && cycle_counter--);
int32_t diff = size * (start_count - count) | 0;
add_reg_asize(EDI, diff);
add_reg_asize(ESI, diff);
set_ecx_asize(count);
*timestamp_counter += start_count - count;
}
else
{
do
{
data_dest = safe_read16(dest);
data_src = safe_read16(src);
dest += size;
add_reg_asize(EDI, size);
src += size;
add_reg_asize(ESI, size);
cont = decr_ecx_asize() != 0 && (data_src == data_dest) == is_repz;
}
while(cont && cycle_counter--);
}
if(cont)
{
*instruction_pointer = *previous_ip;
}
cmp16(data_src, data_dest);
diverged();
}
void cmpsw_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 ? -2 : 2;
data_dest = safe_read16(dest);
data_src = safe_read16(src);
add_reg_asize(EDI, size);
add_reg_asize(ESI, size);
cmp16(data_src, data_dest);
diverged();
}
void cmpsw()
{
if(*prefixes & PREFIX_MASK_REP)
{
cmpsw_rep();
}
else
{
cmpsw_no_rep();
}
}