*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
+#include <stdio.h>
+#include <string.h>
+
+#include "common.h"
+#include "cpu8051.h"
+#include "reg8051.h"
+#include "hexfile.h"
#include "memory.h"
+#include "options.h"
+
+struct mem_infos_t {
+ int size;
+ int max_size;
+ u_int8_t *buf;
+};
+
+struct mem_infos_t mem_infos[MEM_ID_COUNT];
+
+extern struct options_t options;
+
+/* Init each 8051 memory sections. */
+void
+memory_init(void)
+{
+ int k;
+ struct mem_infos_t *m;
+
+ /* Set desired and maximum allowable sizes for each memory type. */
+ mem_infos[PGM_MEM_ID].size = options.pram_size;
+ mem_infos[PGM_MEM_ID].max_size = PGM_MEM_MAX_SIZE;
+
+ mem_infos[INT_MEM_ID].size = options.iram_size;
+ mem_infos[INT_MEM_ID].max_size = INT_MEM_MAX_SIZE;
+ mem_infos[EXT_MEM_ID].size = options.xram_size;
+ mem_infos[EXT_MEM_ID].max_size = EXT_MEM_MAX_SIZE;
-#define SFR_MEM_SIZE 128
-#define PGM_MEM_SIZE 65536
-#define INT_MEM_SIZE 128
-#define EXT_MEM_SIZE 65536
+ /* Verify if desired sizes are valid, and if so allocate memory. */
+ for (k = 0; k < MEM_ID_COUNT; k++) {
+ m = &mem_infos[k];
+ if (m->size > m->max_size) {
+ log_err("Memory size invalid (max = %d)", m->max_size);
+ exit(1);
+ }
-static u_int8_t sfr_mem[SFR_MEM_SIZE];
-static u_int8_t pgm_mem[PGM_MEM_SIZE];
-static u_int8_t int_mem[INT_MEM_SIZE];
-static u_int8_t ext_mem[EXT_MEM_SIZE];
+ m->buf = malloc(m->size);
+ if (m->buf == NULL) {
+ log_err("%s", strerror(errno));
+ exit(1);
+ }
+
+ memset(m->buf, 0x00, m->size);
+ }
+}
+
+void
+memory_clear(enum mem_id_t id)
+{
+ memset(mem_infos[id].buf, 0, mem_infos[id].size);
+}
+
+void
+memory_write8(enum mem_id_t id, unsigned long address, u_int8_t value)
+{
+ if (address >= mem_infos[id].max_size) {
+ printf("Error writing to memory ID: %d\n", id);
+ printf(" Address (%lu) greater than maximum memory size\n",
+ address);
+ return;
+ } else
+ mem_infos[id].buf[address] = value;
+}
+void
+memory_sfr_write8(unsigned long address, u_int8_t value)
+{
+ /* SFR registers are from addresses $80 to $FF. */
+ memory_write8(INT_MEM_ID, address, value);
+}
void
-memory_write8( int memory_id, unsigned long address, u_int8_t value )
+memory_sfr_write_dptr(u_int16_t value)
{
- switch( memory_id ) {
- case SFR_MEM_ID:
- if( address >= SFR_MEM_SIZE ) {
- return;
- }
- else {
- sfr_mem[address] = value;
- }
- break;
- case PGM_MEM_ID:
- if( address >= PGM_MEM_SIZE ) {
- return;
- }
- else {
- pgm_mem[address] = value;
- }
- break;
- case INT_MEM_ID:
- if( address >= INT_MEM_SIZE ) {
- return;
- }
- else {
- int_mem[address] = value;
- }
- break;
- case EXT_MEM_ID:
- if( address >= EXT_MEM_SIZE ) {
- return;
- }
- else {
- ext_mem[address] = value;
- }
- break;
- default:
- /* Error. */
- break;
- }
+ memory_write8(INT_MEM_ID, _DPTRHIGH_, value >> 8);
+ memory_write8(INT_MEM_ID, _DPTRLOW_, (uint8_t) value);
}
+u_int8_t
+memory_read8(enum mem_id_t id, unsigned long address)
+{
+ if (address >= mem_infos[id].max_size) {
+ printf("Error reading from memory ID: %d\n", id);
+ printf(" Address (%lu) greater than maximum memory size\n",
+ address);
+ return 0;
+ } else
+ return mem_infos[id].buf[address];
+}
u_int8_t
-memory_read8( int memory_id, unsigned long address )
+memory_sfr_read8(unsigned long address)
{
- switch( memory_id ) {
- case SFR_MEM_ID:
- if( address < SFR_MEM_SIZE ) {
- return sfr_mem[address];
- }
- else {
- return 0;
- }
- break;
- case PGM_MEM_ID:
- if( address < PGM_MEM_SIZE ) {
- return pgm_mem[address];
- }
- else {
- return 0;
- }
- break;
- case INT_MEM_ID:
- if( address < INT_MEM_SIZE ) {
- return int_mem[address];
- }
- else {
- return 0;
- }
- break;
- case EXT_MEM_ID:
- if( address < EXT_MEM_SIZE ) {
- return ext_mem[address];
- }
- else {
- return 0;
- }
- break;
- default:
- /* Error. */
- return 0;
- break;
- }
+ /* SFR registers are from addresses $80 to $FF. */
+ return memory_read8(INT_MEM_ID, address);
+}
+
+u_int16_t
+memory_sfr_read_dptr(void)
+{
+ return (memory_read8(INT_MEM_ID, _DPTRHIGH_) << 8) +
+ memory_read8(INT_MEM_ID, _DPTRLOW_);
+}
+
+void
+stack_push8(uint8_t value)
+{
+ uint8_t sp;
+
+ sp = memory_read8(INT_MEM_ID, _SP_);
+
+ memory_write8(INT_MEM_ID, ++sp, value);
+ memory_write8(INT_MEM_ID, _SP_, sp); /* Save new stack pointer */
+}
+
+void
+stack_push16(uint16_t value)
+{
+ uint8_t sp;
+
+ sp = memory_read8(INT_MEM_ID, _SP_);
+
+ memory_write8(INT_MEM_ID, ++sp, (uint8_t) value); /* Write LSB */
+ memory_write8(INT_MEM_ID, ++sp, value >> 8); /* Write MSB */
+ memory_write8(INT_MEM_ID, _SP_, sp); /* Save new stack pointer */
+}
+
+uint8_t
+stack_pop8(void)
+{
+ uint8_t sp;
+ uint8_t value;
+
+ sp = memory_read8(INT_MEM_ID, _SP_);
+
+ value = memory_read8(INT_MEM_ID, sp--);
+ memory_write8(INT_MEM_ID, _SP_, sp); /* Save new stack pointer */
+
+ return value;
+}
+
+uint16_t
+stack_pop16(void)
+{
+ uint8_t sp;
+ uint16_t value;
+
+ sp = memory_read8(INT_MEM_ID, _SP_);
+
+ value = memory_read8(INT_MEM_ID, sp--) << 8; /* Read MSB */
+ value |= memory_read8(INT_MEM_ID, sp--); /* Read LSB */
+ memory_write8(INT_MEM_ID, _SP_, sp); /* Save new stack pointer */
+
+ return value;
+}
+
+/* Read a 16-bit address from PGM memory, starting at <base> offset */
+uint16_t
+pgm_read_addr16(uint16_t base)
+{
+ uint16_t addr;
+
+ addr = memory_read8(PGM_MEM_ID, base) << 8; /* MSB */
+ addr |= memory_read8(PGM_MEM_ID, base + 1); /* LSB */
+
+ return addr;
+}
+
+/* Dump memory */
+void
+DumpMem(char *Address, char *Asize, int memory_id)
+{
+ unsigned int MemAddress;
+ int size;
+ int Offset, Column;
+
+ if (strlen(Address) != 0) {
+ if (STREQ(Address, "PC"))
+ MemAddress = cpu8051.pc;
+ else
+ MemAddress = Ascii2Hex(Address, strlen(Address));
+ } else {
+ MemAddress = 0;
+ }
+
+ if (strlen(Asize) != 0) {
+ size = Ascii2Hex(Asize, strlen(Asize));
+ } else {
+ size = 256; /* Default size if not specified. */
+ }
+
+ for (Offset = 0; Offset < size; Offset += 16) {
+ unsigned char data[16];
+
+ printf("%.4X ", MemAddress + Offset);
+
+ for (Column = 0; Column < 16; Column++) {
+ data[Column] = memory_read8(memory_id, MemAddress +
+ Offset + Column);
+ printf(" %.2X", (int) data[Column]);
+ }
+ printf(" ");
+
+ /* Display any ASCII characters */
+ for (Column = 0; Column < 16; Column++) {
+ if ((int) data[Column] >= 32 &&
+ (int) data[Column] <= 126) {
+ printf("%c", data[Column]);
+ } else
+ printf(".");
+ }
+ printf("\n");
+ }
}
projects / emu8051.git / blobdiff