static inline void set_ip_tos(struct __sk_buff *skb, __u8 new_tos)
{
__u8 old_tos = load_byte(skb, TOS_OFF);
bpf_l3_csum_replace(skb, IP_CSUM_OFF, htons(old_tos), htons(new_tos), 2);
bpf_skb_store_bytes(skb, TOS_OFF, &new_tos, sizeof(new_tos), 0);
}
void amax_disk_select (uae_u8 v, uae_u8 ov)
{
bfd100 = v;
if (!(bfd100 & dselect) && (ov & dselect))
load_byte ();
amax_check ();
}
/**
* @brief ROL mem
*/
void Cpu::rol_mem(uint16_t addr, uint8_t cycles)
{
uint8_t v = load_byte(addr);
/* see ASL doc */
mem_->write_byte(addr,v);
mem_->write_byte(addr,rol(v));
tick(cycles);
}
/**
* @brief BIT test
*/
void Cpu::bit(uint16_t addr, uint8_t cycles)
{
uint8_t t = load_byte(addr);
of((t&0x40)!=0);
SET_NF(t);
SET_ZF(t&a());
tick(cycles);
}
static inline int do_redirect(struct __sk_buff *skb, int nh_off, int dir)
{
__u16 dport, off;
__u8 ip_proto, ip_vl;
int *ifindex;
__be32 ip_dest, ip_src;
char fmt[] = "skb %p len %d ip_dest %x\n";
ip_proto = load_byte(skb, nh_off +
offsetof(struct iphdr, protocol));
ip_src = load_word(skb, nh_off +
offsetof(struct iphdr, saddr));
ip_dest = load_word(skb, nh_off +
offsetof(struct iphdr, daddr));
if (ip_proto != IPPROTO_TCP)
return 0;
ip_vl = load_byte(skb, nh_off);
if (likely(ip_vl == 0x45))
nh_off += sizeof(struct iphdr);
else
nh_off += (ip_vl & 0xF) << 2;
bpf_trace_printk(fmt, sizeof(fmt), skb, skb->len, ip_dest);
dport = load_half(skb, nh_off + offsetof(struct tcphdr, dest));
if (dport != 80)
return 0;
if (dir == 0) {
ifindex = bpf_map_lookup_elem(&container_map, &ip_dest);
if (ifindex) {
set_tcp_dest_port(skb, 8080);
bpf_clone_redirect(skb, *ifindex, 1);
}
} else {
ifindex = bpf_map_lookup_elem(&container_map, &ip_src);
if (ifindex)
set_tcp_dest_port(skb, 80);
}
return -1;
}
bool trainer_check_flag_on_spot(u8 npc_id) {
void *script = npc_get_script_by_npc_id(npc_id);
/* probably inject some script execution here */
u16 flag = tb_modify_flag_id(load_hword(script + 2));
/* check for line of sight */
u8 hit_result = npc_trainer_and_raycast_hit(&npc_states[npc_id]);
if (hit_result == 0)
return false;
if (flag_check(trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START)))
return false;
if ((load_byte(script + 1) == 4) && (player_cant_double_battle() > 0))
return false;
spot_trainer_8080334(npc_id, script);
spot_trainer_8081E68(&npc_states[npc_id], hit_result - 1);
return true;
}
void
mef_load(unsigned char* offset)
{
unsigned char* start = offset;
unsigned char areasize = load_byte();
uint16_t relocsize;
unsigned int i, j;
uint16_t checksum = 0;
unsigned char* buf;
struct Relocation reloc;
for (i = 0; i < areasize; i++) {
buf = (unsigned char *) &areas[i];
for (j = 0; j < sizeof(struct Area); j++) {
*buf++ = load_byte();
}
}
for (i = 0; i < areasize; i++) {
for (j = 0; j < areas[i].size; j++) {
*offset = load_byte();
checksum += *offset;
offset++;
}
if (areas[i].checksum != checksum) {
// Checksum error!
}
}
// relocation information
relocsize = load_byte();
relocsize = (load_byte() << 8) + relocsize;
for (i = 0; i < relocsize; i++) {
buf = (unsigned char *) &reloc;
for (j = 0; j < sizeof(struct Relocation); j++) {
*buf++ = load_byte();
}
mef_reloc(start, &reloc);
}
}
static char *nscdec( vlc_object_t *p_demux, char* p_encoded )
{
unsigned int i;
unsigned char tmp;
unsigned char j, k;
unsigned int length;
unsigned char encoding_type;
unsigned char *buf16;
char *buf8;
char *p_input = p_encoded;
if( strlen( p_input ) < 15 )
{
msg_Err( p_demux, "input string less than 15 characters" );
return NULL;
}
if( load_byte( 1, &encoding_type, &p_input, NULL, NULL ) )
{
msg_Err( p_demux, "unable to get NSC encoding type" );
return NULL;
}
if( encoding_type != 1 && encoding_type != 2 )
{
msg_Err( p_demux, "encoding type %d is not supported",
encoding_type );
return NULL;
}
j = k = 0;
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
for( i = 0; i < 4; i++ )
{
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
}
length = 0;
for( i = 4; i; i-- )
{
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
length |= tmp << ((i - 1) * 8);
}
if( length == 0 )
{
msg_Err( p_demux, "Length is 0" );
return NULL;
}
buf16 = malloc( length );
if( buf16 == NULL )
return NULL;
for( i = 0; i < length; i++ )
{
if( load_byte( encoding_type, &buf16[ i ], &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
free( buf16 );
return NULL;
}
}
buf8 = FromCharset( "UTF-16LE", buf16, length );
free( buf16 );
if( buf8 == NULL )
{
msg_Err( p_demux, "iconv failed" );
return NULL;
}
return buf8;
}
static inline __u64 parse_ip(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
struct bpf_flow_keys *flow)
{
__u64 verlen;
if (unlikely(ip_is_fragment(skb, nhoff)))
*ip_proto = 0;
else
*ip_proto = load_byte(skb, nhoff + offsetof(struct iphdr, protocol));
if (*ip_proto != IPPROTO_GRE) {
flow->src = load_word(skb, nhoff + offsetof(struct iphdr, saddr));
flow->dst = load_word(skb, nhoff + offsetof(struct iphdr, daddr));
}
verlen = load_byte(skb, nhoff + 0/*offsetof(struct iphdr, ihl)*/);
if (likely(verlen == 0x45))
nhoff += 20;
else
nhoff += (verlen & 0xF) << 2;
return nhoff;
}
static inline __u64 parse_ipv6(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto,
struct bpf_flow_keys *flow)
{
*ip_proto = load_byte(skb,
nhoff + offsetof(struct ipv6hdr, nexthdr));
flow->src = ipv6_addr_hash(skb,
nhoff + offsetof(struct ipv6hdr, saddr));
/*eBPF program.
Filter IP and TCP packets, having payload not empty
and containing "HTTP", "GET", "POST" ... as first bytes of payload
if the program is loaded as PROG_TYPE_SOCKET_FILTER
and attached to a socket
return 0 -> DROP the packet
return -1 -> KEEP the packet and return it to user space (userspace can read it from the socket_fd )
*/
int http_filter(struct __sk_buff *skb) {
u8 *cursor = 0;
struct ethernet_t *ethernet = cursor_advance(cursor, sizeof(*ethernet));
//filter IP packets (ethernet type = 0x0800)
if (!(ethernet->type == 0x0800)) {
goto DROP;
}
struct ip_t *ip = cursor_advance(cursor, sizeof(*ip));
//filter TCP packets (ip next protocol = 0x06)
if (ip->nextp != IP_TCP) {
goto DROP;
}
u32 tcp_header_length = 0;
u32 ip_header_length = 0;
u32 payload_offset = 0;
u32 payload_length = 0;
struct tcp_t *tcp = cursor_advance(cursor, sizeof(*tcp));
//calculate ip header length
//value to multiply * 4
//e.g. ip->hlen = 5 ; IP Header Length = 5 x 4 byte = 20 byte
ip_header_length = ip->hlen << 2; //SHL 2 -> *4 multiply
//calculate tcp header length
//value to multiply *4
//e.g. tcp->offset = 5 ; TCP Header Length = 5 x 4 byte = 20 byte
tcp_header_length = tcp->offset << 2; //SHL 2 -> *4 multiply
//calculate patload offset and length
payload_offset = ETH_HLEN + ip_header_length + tcp_header_length;
payload_length = ip->tlen - ip_header_length - tcp_header_length;
//http://stackoverflow.com/questions/25047905/http-request-minimum-size-in-bytes
//minimum length of http request is always geater than 7 bytes
//avoid invalid access memory
//include empty payload
if(payload_length < 7) {
goto DROP;
}
//load first 7 byte of payload into p (payload_array)
//direct access to skb not allowed
unsigned long p[7];
int i = 0;
int j = 0;
const int last_index = payload_offset + 7;
for (i = payload_offset ; i < last_index ; i++) {
p[j] = load_byte(skb , i);
j++;
}
//find a match with an HTTP message
//HTTP
if ((p[0] == 'H') && (p[1] == 'T') && (p[2] == 'T') && (p[3] == 'P')) {
goto KEEP;
}
//GET
if ((p[0] == 'G') && (p[1] == 'E') && (p[2] == 'T')) {
goto KEEP;
}
//POST
if ((p[0] == 'P') && (p[1] == 'O') && (p[2] == 'S') && (p[3] == 'T')) {
goto KEEP;
}
//PUT
if ((p[0] == 'P') && (p[1] == 'U') && (p[2] == 'T')) {
goto KEEP;
}
//DELETE
if ((p[0] == 'D') && (p[1] == 'E') && (p[2] == 'L') && (p[3] == 'E') && (p[4] == 'T') && (p[5] == 'E')) {
goto KEEP;
}
//HEAD
if ((p[0] == 'H') && (p[1] == 'E') && (p[2] == 'A') && (p[3] == 'D')) {
goto KEEP;
}
//no HTTP match
goto DROP;
//keep the packet and send it to userspace retruning -1
KEEP:
return -1;
//drop the packet returning 0
DROP:
return 0;
}
char *nscdec( vlc_object_t *p_demux, char* p_encoded )
{
unsigned int i;
unsigned char tmp;
unsigned char j, k;
unsigned int length;
unsigned char encoding_type;
vlc_iconv_t conv;
size_t buf16_size;
unsigned char *buf16;
char *p_buf16;
size_t buf8_size;
char *buf8;
char *p_buf8;
char *p_input = p_encoded;
if( strlen( p_input ) < 15 )
{
msg_Err( p_demux, "input string less than 15 characters" );
return NULL;
}
if( load_byte( 1, &encoding_type, &p_input, NULL, NULL ) )
{
msg_Err( p_demux, "unable to get NSC encoding type" );
return NULL;
}
if( encoding_type != 1 && encoding_type != 2 )
{
msg_Err( p_demux, "encoding type %d is not supported",
encoding_type );
return NULL;
}
j = k = 0;
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
for( i = 0; i < 4; i++ )
{
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
}
length = 0;
for( i = 4; i; i-- )
{
if( load_byte( encoding_type, &tmp, &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
return NULL;
}
length |= tmp << ((i - 1) * 8);
}
if( length == 0 )
{
msg_Err( p_demux, "Length is 0" );
return NULL;
}
buf16_size = length;
buf16 = (unsigned char *)malloc( buf16_size );
if( buf16 == NULL )
{
msg_Err( p_demux, "out of memory" );
return NULL;
}
for( i = 0; i < length; i++ )
{
if( load_byte( encoding_type, &buf16[ i ], &p_input, &j, &k ) )
{
msg_Err( p_demux, "load_byte failed" );
free( (void *)buf16 );
return NULL;
}
}
buf8_size = length;
buf8 = (char *)malloc( buf8_size + 1 );
if( buf8 == NULL )
{
msg_Err( p_demux, "out of memory" );
free( (void *)buf16 );
return NULL;
}
conv = vlc_iconv_open( "UTF-8", "UTF-16LE" );
if( conv == (vlc_iconv_t)-1 )
{
msg_Err( p_demux, "iconv_open failed" );
free( (void *)buf16 );
free( (void *)buf8 );
return NULL;
}
p_buf8 = &buf8[ 0 ];
p_buf16 = (char *)&buf16[ 0 ];
if( vlc_iconv( conv, &p_buf16, &buf16_size, &p_buf8, &buf8_size ) < 0 )
{
msg_Err( p_demux, "iconv failed" );
return NULL;
}
else
{
buf8[ length - buf8_size ] = '\0';
}
vlc_iconv_close( conv );
free( (void *)buf16 );
return buf8;
}
/**
* @brief emulate instruction
* @return returns false if something goes wrong (e.g. illegal instruction)
*
* Current limitations:
*
* - Illegal instructions are not implemented
* - Excess cycles due to page boundary crossing are not calculated
* - Some known architectural bugs are not emulated
*/
bool Cpu::emulate()
{
/* fetch instruction */
uint8_t insn = fetch_op();
bool retval = true;
/* emulate instruction */
switch(insn)
{
/* BRK */
case 0x0: brk(); break;
/* ORA (nn,X) */
case 0x1: ora(load_byte(addr_indx()),6); break;
/* ORA nn */
case 0x5: ora(load_byte(addr_zero()),3); break;
/* ASL nn */
case 0x6: asl_mem(addr_zero(),5); break;
/* PHP */
case 0x8: php(); break;
/* ORA #nn */
case 0x9: ora(fetch_op(),2); break;
/* ASL A */
case 0xA: asl_a(); break;
/* ORA nnnn */
case 0xD: ora(load_byte(addr_abs()),4); break;
/* ASL nnnn */
case 0xE: asl_mem(addr_abs(),6); break;
/* BPL nn */
case 0x10: bpl(); break;
/* ORA (nn,Y) */
case 0x11: ora(load_byte(addr_indy()),5); break;
/* ORA nn,X */
case 0x15: ora(load_byte(addr_zerox()),4); break;
/* ASL nn,X */
case 0x16: asl_mem(addr_zerox(),6); break;
/* CLC */
case 0x18: clc(); break;
/* ORA nnnn,Y */
case 0x19: ora(load_byte(addr_absy()),4); break;
/* ORA nnnn,X */
case 0x1D: ora(load_byte(addr_absx()),4); break;
/* ASL nnnn,X */
case 0x1E: asl_mem(addr_absx(),7); break;
/* JSR */
case 0x20: jsr(); break;
/* AND (nn,X) */
case 0x21: _and(load_byte(addr_indx()),6); break;
/* BIT nn */
case 0x24: bit(addr_zero(),3); break;
/* AND nn */
case 0x25: _and(load_byte(addr_zero()),3); break;
/* ROL nn */
case 0x26: rol_mem(addr_zero(),5); break;
/* PLP */
case 0x28: plp(); break;
/* AND #nn */
case 0x29: _and(fetch_op(),2); break;
/* ROL A */
case 0x2A: rol_a(); break;
/* BIT nnnn */
case 0x2C: bit(addr_abs(),4); break;
/* AND nnnn */
case 0x2D: _and(load_byte(addr_abs()),4); break;
/* ROL nnnn */
case 0x2E: rol_mem(addr_abs(),6); break;
/* BMI nn */
case 0x30: bmi(); break;
/* AND (nn,Y) */
case 0x31: _and(load_byte(addr_indy()),5); break;
/* AND nn,X */
case 0x35: _and(load_byte(addr_zerox()),4); break;
/* ROL nn,X */
case 0x36: rol_mem(addr_zerox(),6); break;
/* SEC */
case 0x38: sec(); break;
/* AND nnnn,Y */
case 0x39: _and(load_byte(addr_absy()),4); break;
/* AND nnnn,X */
case 0x3D: _and(load_byte(addr_absx()),4); break;
/* ROL nnnn,X */
case 0x3E: rol_mem(addr_absx(),7); break;
/* RTI */
case 0x40: rti(); break;
/* EOR (nn,X) */
case 0x41: eor(load_byte(addr_indx()),6); break;
/* EOR nn */
case 0x45: eor(load_byte(addr_zero()),3); break;
/* LSR nn */
case 0x46: lsr_mem(addr_zero(),5); break;
/* PHA */
case 0x48: pha(); break;
/* EOR #nn */
case 0x49: eor(fetch_op(),2); break;
/* BVC */
case 0x50: bvc(); break;
/* JMP nnnn */
case 0x4C: jmp(); break;
/* EOR nnnn */
case 0x4D: eor(load_byte(addr_abs()),4); break;
/* LSR A */
case 0x4A: lsr_a(); break;
/* LSR nnnn */
case 0x4E: lsr_mem(addr_abs(),6); break;
/* EOR (nn,Y) */
case 0x51: eor(load_byte(addr_indy()),5); break;
/* EOR nn,X */
case 0x55: eor(load_byte(addr_zerox()),4); break;
/* LSR nn,X */
case 0x56: lsr_mem(addr_zerox(),6); break;
/* CLI */
case 0x58: cli(); break;
/* EOR nnnn,Y */
case 0x59: eor(load_byte(addr_absy()),4); break;
/* EOR nnnn,X */
case 0x5D: eor(load_byte(addr_absx()),4); break;
/* LSR nnnn,X */
case 0x5E: lsr_mem(addr_absx(),7); break;
/* RTS */
case 0x60: rts(); break;
/* ADC (nn,X) */
case 0x61: adc(load_byte(addr_indx()),6); break;
/* ADC nn */
case 0x65: adc(load_byte(addr_zero()),3); break;
/* ROR nn */
case 0x66: ror_mem(addr_zero(),5); break;
/* PLA */
case 0x68: pla(); break;
/* ADC #nn */
case 0x69: adc(fetch_op(),2); break;
/* ROR A */
case 0x6A: ror_a(); break;
/* JMP (nnnn) */
case 0x6C: jmp_ind(); break;
/* ADC nnnn */
case 0x6D: adc(load_byte(addr_abs()),4); break;
/* ROR nnnn */
case 0x6E: ror_mem(addr_abs(),6); break;
/* BVS */
case 0x70: bvs(); break;
/* ADC (nn,Y) */
case 0x71: adc(load_byte(addr_indy()),5); break;
/* ADC nn,X */
case 0x75: adc(load_byte(addr_zerox()),4); break;
/* ROR nn,X */
case 0x76: ror_mem(addr_zerox(),6); break;
/* SEI */
case 0x78: sei(); break;
/* ADC nnnn,Y */
case 0x79: adc(load_byte(addr_absy()),4); break;
/* ADC nnnn,X */
case 0x7D: adc(load_byte(addr_absx()),4); break;
/* ROR nnnn,X */
case 0x7E: ror_mem(addr_absx(),7); break;
/* STA (nn,X) */
case 0x81: sta(addr_indx(),6); break;
/* STY nn */
case 0x84: sty(addr_zero(),3); break;
/* STA nn */
case 0x85: sta(addr_zero(),3); break;
/* STX nn */
case 0x86: stx(addr_zero(),3); break;
/* DEY */
case 0x88: dey(); break;
/* TXA */
case 0x8A: txa(); break;
/* STY nnnn */
case 0x8C: sty(addr_abs(),4); break;
/* STA nnnn */
case 0x8D: sta(addr_abs(),4); break;
/* STX nnnn */
case 0x8E: stx(addr_abs(),4); break;
/* BCC nn */
case 0x90: bcc(); break;
/* STA (nn,Y) */
case 0x91: sta(addr_indy(),6); break;
/* STY nn,X */
case 0x94: sty(addr_zerox(),4); break;
/* STA nn,X */
case 0x95: sta(addr_zerox(),4); break;
/* STX nn,Y */
case 0x96: stx(addr_zeroy(),4); break;
/* TYA */
case 0x98: tya(); break;
/* STA nnnn,Y */
case 0x99: sta(addr_absy(),5); break;
/* TXS */
case 0x9A: txs(); break;
/* STA nnnn,X */
case 0x9D: sta(addr_absx(),5); break;
/* LDY #nn */
case 0xA0: ldy(fetch_op(),2); break;
/* LDA (nn,X) */
case 0xA1: lda(load_byte(addr_indx()),6); break;
/* LDX #nn */
case 0xA2: ldx(fetch_op(),2); break;
/* LDY nn */
case 0xA4: ldy(load_byte(addr_zero()),3); break;
/* LDA nn */
case 0xA5: lda(load_byte(addr_zero()),3); break;
/* LDX nn */
case 0xA6: ldx(load_byte(addr_zero()),3); break;
/* TAY */
case 0xA8: tay(); break;
/* LDA #nn */
case 0xA9: lda(fetch_op(),2); break;
/* TAX */
case 0xAA: tax(); break;
/* LDY nnnn */
case 0xAC: ldy(load_byte(addr_abs()),4); break;
/* LDA nnnn */
case 0xAD: lda(load_byte(addr_abs()),4); break;
/* LDX nnnn */
case 0xAE: ldx(load_byte(addr_abs()),4); break;
/* BCS nn */
case 0xB0: bcs(); break;
/* LDA (nn,Y) */
case 0xB1: lda(load_byte(addr_indy()),5); break;
/* LDY nn,X */
case 0xB4: ldy(load_byte(addr_zerox()),3); break;
/* LDA nn,X */
case 0xB5: lda(load_byte(addr_zerox()),3); break;
/* LDX nn,Y */
case 0xB6: ldx(load_byte(addr_zeroy()),3); break;
/* CLV */
case 0xB8: clv(); break;
/* LDA nnnn,Y */
case 0xB9: lda(load_byte(addr_absy()),4); break;
/* TSX */
case 0xBA: tsx(); break;
/* LDY nnnn,X */
case 0xBC: ldy(load_byte(addr_absx()),4); break;
/* LDA nnnn,X */
case 0xBD: lda(load_byte(addr_absx()),4); break;
/* LDX nnnn,Y */
case 0xBE: ldx(load_byte(addr_absy()),4); break;
/* CPY #nn */
case 0xC0: cpy(fetch_op(),2); break;
/* CMP (nn,X) */
case 0xC1: cmp(load_byte(addr_indx()),6); break;
/* CPY nn */
case 0xC4: cpy(load_byte(addr_zero()),3); break;
/* CMP nn */
case 0xC5: cmp(load_byte(addr_zero()),3); break;
/* DEC nn */
case 0xC6: dec(addr_zero(),5); break;
/* INY */
case 0xC8: iny(); break;
/* CMP #nn */
case 0xC9: cmp(fetch_op(),2); break;
/* DEX */
case 0xCA: dex(); break;
/* CPY nnnn */
case 0xCC: cpy(load_byte(addr_abs()),4); break;
/* CMP nnnn */
case 0xCD: cmp(load_byte(addr_abs()),4); break;
/* DEC nnnn */
case 0xCE: dec(addr_abs(),6); break;
/* BNE nn */
case 0xD0: bne(); break;
/* CMP (nn,Y) */
case 0xD1: cmp(load_byte(addr_indy()),5); break;
/* CMP nn,X */
case 0xD5: cmp(load_byte(addr_zerox()),4); break;
/* DEC nn,X */
case 0xD6: dec(addr_zerox(),6); break;
/* CLD */
case 0xD8: cld(); break;
/* CMP nnnn,Y */
case 0xD9: cmp(load_byte(addr_absy()),4); break;
/* CMP nnnn,X */
case 0xDD: cmp(load_byte(addr_absx()),4); break;
/* DEC nnnn,X */
case 0xDE: dec(addr_absx(),7); break;
/* CPX #nn */
case 0xE0: cpx(fetch_op(),2); break;
/* SBC (nn,X) */
case 0xE1: sbc(load_byte(addr_indx()),6); break;
/* CPX nn */
case 0xE4: cpx(load_byte(addr_zero()),3); break;
/* SBC nn */
case 0xE5: sbc(load_byte(addr_zero()),3); break;
/* INC nn */
case 0xE6: inc(addr_zero(),5); break;
/* INX */
case 0xE8: inx(); break;
/* SBC #nn */
case 0xE9: sbc(fetch_op(),2); break;
/* NOP */
case 0xEA: nop(); break;
/* CPX nnnn */
case 0xEC: cpx(load_byte(addr_abs()),4); break;
/* SBC nnnn */
case 0xED: sbc(load_byte(addr_abs()),4); break;
/* INC nnnn */
case 0xEE: inc(addr_abs(),6); break;
/* BEQ nn */
case 0xF0: beq(); break;
/* SBC (nn,Y) */
case 0xF1: sbc(load_byte(addr_indy()),5); break;
/* SBC nn,X */
case 0xF5: sbc(load_byte(addr_zerox()),4); break;
/* INC nn,X */
case 0xF6: inc(addr_zerox(),6); break;
/* SED */
case 0xF8: sed(); break;
/* SBC nnnn,Y */
case 0xF9: sbc(load_byte(addr_absy()),4); break;
/* SBC nnnn,X */
case 0xFD: sbc(load_byte(addr_absx()),4); break;
/* INC nnnn,X */
case 0xFE: inc(addr_absx(),7); break;
/* Unknown or illegal instruction */
default:
D("Unknown instruction: %X at %04x\n", insn,pc());
retval = false;
}
return retval;
}
uint8_t Cpu::fetch_op()
{
return load_byte(pc_++);
}
uint8_t Cpu::pop()
{
uint16_t addr = ++sp_+Memory::kBaseAddrStack;
return load_byte(addr);
}
