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Fixes implementation of hardware multiply/divide peripheral in RL78 G13 cores.

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* load.c (rl78_load): If the G10, G13 or G14 flag bits are set in
	the ELF header use them to select the proper emulation mode.
	* mem.c (mem_put_byte): Use mem_put_hi to store a value into the
	MDB register.
	(mem_get_byte): Use mem_get_hi to extract a value from the MDB
	register.
This commit is contained in:
Nick Clifton
2015-03-20 10:29:46 +00:00
parent e8ffc436d9
commit 4819f490bd
3 changed files with 35 additions and 6 deletions
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18
sim/rl78/mem.c
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@@ -140,6 +140,10 @@ mem_put_byte (int address, unsigned char value)
printf ("Warning: SP value 0x%04x truncated at pc=0x%05x\n", value, pc);
value &= ~1;
}
if (! g13_multiply)
return;
if (address == MDUC)
{
if ((value & 0x81) == 0x81)
@@ -166,20 +170,23 @@ mem_put_byte (int address, unsigned char value)
ahu = mem_get_hi (MDAH);
rvu = alu * ahu;
tprintf ("MDUC: %lu * %lu = %lu\n", alu, ahu, rvu);
mem_put_si (MDBL, rvu);
mem_put_hi (MDBL, rvu & 0xffff);
mem_put_hi (MDBH, rvu >> 16);
break;
case 0x08:
als = sign_ext (mem_get_hi (MDAL), 16);
ahs = sign_ext (mem_get_hi (MDAH), 16);
rvs = als * ahs;
tprintf ("MDUC: %ld * %ld = %ld\n", als, ahs, rvs);
mem_put_si (MDBL, rvs);
mem_put_hi (MDBL, rvs & 0xffff);
mem_put_hi (MDBH, rvs >> 16);
break;
case 0x40:
alu = mem_get_hi (MDAL);
ahu = mem_get_hi (MDAH);
rvu = alu * ahu;
mem_put_si (MDBL, rvu);
mem_put_hi (MDBL, rvu & 0xffff);
mem_put_hi (MDBH, rvu >> 16);
mdc = mem_get_si (MDCL);
tprintf ("MDUC: %lu * %lu + %lu = ", alu, ahu, mdc);
mdc += (long) rvu;
@@ -190,7 +197,8 @@ mem_put_byte (int address, unsigned char value)
als = sign_ext (mem_get_hi (MDAL), 16);
ahs = sign_ext (mem_get_hi (MDAH), 16);
rvs = als * ahs;
mem_put_si (MDBL, rvs);
mem_put_hi (MDBL, rvs & 0xffff);
mem_put_hi (MDBH, rvs >> 16);
mdc = mem_get_si (MDCL);
tprintf ("MDUC: %ld * %ld + %ld = ", als, ahs, mdc);
tprintf ("%ld\n", mdc);
@@ -228,7 +236,7 @@ mem_get_byte (int address)
unsigned long a, b, q, r;
memory [MDUC] &= 0xfe;
a = mem_get_si (MDAL);
b = mem_get_si (MDAL);
b = mem_get_hi (MDBL) | (mem_get_hi (MDBH) << 16);
if (b == 0)
{
q = ~0;