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- Minor optimization to execute_ppc() as we apparently don't need to move

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target PC into CTR.
- Fix breakage introduced during little endian fixing. We now assume that
  MacOS doesn't rely on any PPC register that may have been saved on top
  of it stack. i.e. register state is saved onto native stack.
This commit is contained in:
gbeauche 2003-10-11 09:33:27 +00:00
parent 1012da75dd
commit ebb67f0421
1 changed files with 10 additions and 12 deletions
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22
SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
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@ -330,15 +330,17 @@ void sheepshaver_cpu::execute_68k(uint32 entry, M68kRegisters *r)
uint32 saved_ctr= ctr();
// Create MacOS stack frame
// FIXME: make sure MacOS doesn't expect PPC registers to live on top
uint32 sp = gpr(1);
gpr(1) -= 56 + 19*4 + 18*8;
gpr(1) -= 56;
WriteMacInt32(gpr(1), sp);
// Save PowerPC registers
for (int i = 13; i < 32; i++)
WriteMacInt32(gpr(1) + 56 + i*4, gpr(i));
uint32 saved_GPRs[19];
memcpy(&saved_GPRs[0], &gpr(13), sizeof(uint32)*(32-13));
#if SAVE_FP_EXEC_68K
memcpy(Mac2HostAddr(gpr(1)+56+19*4), &fpr(14), sizeof(double)*(32-14));
double saved_FPRs[18];
memcpy(&saved_FPRs[0], &fpr(14), sizeof(double)*(32-14));
#endif
// Setup registers for 68k emulator
@ -385,14 +387,13 @@ void sheepshaver_cpu::execute_68k(uint32 entry, M68kRegisters *r)
r->a[i] = gpr(16 + i);
// Restore PowerPC registers
for (int i = 13; i < 32; i++)
gpr(i) = ReadMacInt32(gpr(1) + 56 + i*4);
memcpy(&gpr(13), &saved_GPRs[0], sizeof(uint32)*(32-13));
#if SAVE_FP_EXEC_68K
memcpy(&fpr(14), Mac2HostAddr(gpr(1)+56+19*4), sizeof(double)*(32-14));
memcpy(&fpr(14), &saved_FPRs[0], sizeof(double)*(32-14));
#endif
// Cleanup stack
gpr(1) += 56 + 19*4 + 18*8;
gpr(1) += 56;
// Restore program counters and branch registers
pc() = saved_pc;
@ -449,17 +450,14 @@ inline void sheepshaver_cpu::execute_ppc(uint32 entry)
{
// Save branch registers
uint32 saved_lr = lr();
uint32 saved_ctr= ctr();
const uint32 trampoline[] = { htonl(POWERPC_EMUL_OP | 1) };
lr() = (uint32)trampoline;
ctr()= entry;
execute(entry);
// Restore branch registers
lr() = saved_lr;
ctr()= saved_ctr;
}
// Resource Manager thunk