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Further comment the ia64 decoder and (minimal) emulator.

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This commit is contained in:
gbeauche 2008-01-06 16:36:00 +00:00
parent 57ae6ed470
commit 8aadf8e455
1 changed files with 14 additions and 9 deletions
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23
BasiliskII/src/Unix/sigsegv.cpp
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@ -1226,19 +1226,19 @@ const int IA64_N_OPERANDS = 4;
// Decoded operand type
struct ia64_operand_t {
unsigned char commit;
unsigned char valid;
signed char index;
unsigned char nat;
unsigned long value;
unsigned char commit; // commit result of operation to register file?
unsigned char valid; // XXX: not really used, can be removed (debug)
signed char index; // index of GPR, or -1 if immediate value
unsigned char nat; // NaT state before operation
unsigned long value; // register contents or immediate value
};
// Decoded instruction type
struct ia64_instruction_t {
unsigned char mnemo;
unsigned char pred;
unsigned char no_memory;
unsigned long inst;
unsigned char mnemo; // operation to perform
unsigned char pred; // predicate register to check
unsigned char no_memory; // used to emulated main fault instruction
unsigned long inst; // the raw instruction bits (41-bit wide)
ia64_operand_t operands[IA64_N_OPERANDS];
};
@ -1614,6 +1614,11 @@ static bool ia64_decode_instruction(ia64_instruction_t *inst, unsigned long *ctx
static bool ia64_emulate_instruction(ia64_instruction_t *inst, unsigned long *ctx)
{
// XXX: handle Register NaT Consumption fault?
// XXX: this simple emulator assumes instructions in a bundle
// don't depend on effects of other instructions in the same
// bundle. It probably would be simpler to JIT-generate code to be
// executed natively but probably more costly (inject/extract CPU state)
if (inst->mnemo == IA64_INST_UNKNOWN)
return false;
if (inst->pred && !IA64_GET_PR(inst->pred))