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port lods*

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This commit is contained in:
Awal Garg 2017-08-02 18:57:15 +05:30 committed by Fabian
parent 6274f90939
commit 96dfe623a2
3 changed files with 150 additions and 3 deletions
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3
src/browser/starter.js
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@ -200,9 +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); },
"_lodsb": function() { return cpu.lodsb.apply(cpu, arguments); },
"_lodsw": function() { return cpu.lodsw.apply(cpu, arguments); },
"_lodsd": function() { return cpu.lodsd.apply(cpu, arguments); },
"_scasb": function() { return cpu.scasb.apply(cpu, arguments); },
"_scasw": function() { return cpu.scasw.apply(cpu, arguments); },
"_scasd": function() { return cpu.scasd.apply(cpu, arguments); },

3
src/cpu.js
View file

@ -356,6 +356,9 @@ CPU.prototype.wasm_patch = function(wm)
this.stosb = this.wm.funcs['_stosb'];
this.stosw = this.wm.funcs['_stosw'];
this.stosd = this.wm.funcs['_stosd'];
this.lodsb = this.wm.funcs['_lodsb'];
this.lodsw = this.wm.funcs['_lodsw'];
this.lodsd = this.wm.funcs['_lodsd'];
};
CPU.prototype.get_state = function()

147
src/native/string.c
View file

@ -687,3 +687,150 @@ void stosd()
}
}
void lodsb_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
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 cycle_counter = MAX_COUNT_PER_CYCLE;
int32_t phys_src = translate_address_read(src);
if(*paging)
{
cycle_counter = string_get_cycle_count(size, src);
}
do
{
reg8[AL] = read8(phys_src);
phys_src += size;
cont = --count != 0;
}
while(cont && cycle_counter--);
int32_t diff = size * (start_count - count);
add_reg_asize(ESI, diff);
set_ecx_asize(count);
*timestamp_counter += start_count - count;
if(cont)
{
*instruction_pointer = *previous_ip;
}
diverged();
}
void lodsb_no_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t size = *flags & FLAG_DIRECTION ? -1 : 1;
reg8[AL] = safe_read8(src);
add_reg_asize(ESI, size);
diverged();
}
void lodsb()
{
if(*prefixes & PREFIX_MASK_REP)
{
lodsb_rep();
}
else
{
lodsb_no_rep();
}
}
void lodsw_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t size = *flags & FLAG_DIRECTION ? -2 : 2;
uint32_t count = ((uint32_t) get_reg_asize(ECX)) >> 0;
if(count == 0) return;
bool cont = false;
uint32_t cycle_counter = MAX_COUNT_PER_CYCLE;
do
{
reg16[AX] = safe_read16(src);
src += size;
add_reg_asize(ESI, size);
cont = decr_ecx_asize() != 0;
}
while(cont && cycle_counter--);
if(cont)
{
*instruction_pointer = *previous_ip;
}
diverged();
}
void lodsw_no_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t size = *flags & FLAG_DIRECTION ? -2 : 2;
reg16[AX] = safe_read16(src);
add_reg_asize(ESI, size);
diverged();
}
void lodsw()
{
if(*prefixes & PREFIX_MASK_REP)
{
lodsw_rep();
}
else
{
lodsw_no_rep();
}
}
void lodsd_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t size = *flags & FLAG_DIRECTION ? -4 : 4;
int32_t count = get_reg_asize(ECX) >> 0;
if(count == 0) return;
int32_t cont = false;
int32_t cycle_counter = MAX_COUNT_PER_CYCLE;
do
{
reg32s[EAX] = safe_read32s(src);
src += size;
add_reg_asize(ESI, size);
cont = decr_ecx_asize() != 0;
}
while(cont && cycle_counter--);
if(cont)
{
*instruction_pointer = *previous_ip;
}
diverged();
}
void lodsd_no_rep()
{
int32_t src = get_seg_prefix(DS) + get_reg_asize(ESI);
int32_t size = *flags & FLAG_DIRECTION ? -4 : 4;
reg32s[EAX] = safe_read32s(src);
add_reg_asize(ESI, size);
diverged();
}
void lodsd()
{
if(*prefixes & PREFIX_MASK_REP)
{
lodsd_rep();
}
else
{
lodsd_no_rep();
}
}