The microcode defined for jmp instructions may have a problem. On
reading the trace, I found that the microop 'wrip' in the code below is
assuming data size to be 1. Looking at the values of t0 and t1 registers,
it seems that the data size should be at least 2. Can any one (most likely
Gabe) comment on this?
def rom
{
extern jmpFarWork:
# t1 has the offset and t2 has the new selector.
# This is intended to run in protected mode.
andi t0, t2, 0xFC, flags=(EZF,), dataSize=2
fault "new GeneralProtection(0)", flags=(CEZF,)
andi t3, t2, 0xF8, dataSize=8
andi t0, t2, 0x4, flags=(EZF,), dataSize=2
br rom_local_label("farJmpGlobalDescriptor"), flags=(CEZF,)
ld t4, tsl, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
br rom_local_label("farJmpProcessDescriptor")
farJmpGlobalDescriptor:
ld t4, tsg, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
farJmpProcessDescriptor:
rcri t0, t4, 13, flags=(ECF,), dataSize=2
br rom_local_label("farJmpSystemDescriptor"), flags=(nCECF,)
chks t2, t4, CSCheck, dataSize=8
wrdl cs, t4, t2
wrsel cs, t2
wrip t0, t1
eret
farJmpSystemDescriptor:
panic "Far jumps to system descriptors aren't implemented"
eret
};
--
Nilay
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