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Use an alternate stack base while servicing PowerPC interrupts.

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This commit is contained in:
gbeauche 2003-12-05 13:37:56 +00:00
parent c3bb2eabf1
commit bbde2a2054
2 changed files with 40 additions and 7 deletions
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41
SheepShaver/src/Unix/main_unix.cpp
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@ -204,7 +204,9 @@ static bool ready_for_signals = false; // Handler installed, signals can be sen
static int64 num_segv = 0; // Number of handled SEGV signals
static struct sigaction sigusr2_action; // Interrupt signal (of emulator thread)
#if !EMULATED_PPC
#if EMULATED_PPC
static uintptr sig_stack = 0; // Stack for PowerPC interrupt routine
#else
static struct sigaction sigsegv_action; // Data access exception signal (of emulator thread)
static struct sigaction sigill_action; // Illegal instruction signal (of emulator thread)
static void *sig_stack = NULL; // Stack for signal handlers
@ -252,6 +254,16 @@ extern void paranoia_check(void);
#if EMULATED_PPC
/*
* Return signal stack base
*/
uintptr SignalStackBase(void)
{
return sig_stack + SIG_STACK_SIZE;
}
/*
* Atomic operations
*/
@ -1773,18 +1785,27 @@ rti:;
bool SheepMem::Init(void)
{
const int page_size = getpagesize();
// Allocate SheepShaver globals
if (vm_acquire_fixed((char *)base, size) < 0)
return false;
// Allocate page with all bits set to 0
zero_page = base + size;
int page_size = getpagesize();
if (vm_acquire_fixed((char *)zero_page, page_size) < 0)
return false;
memset((char *)zero_page, 0, page_size);
if (vm_protect((char *)zero_page, page_size, VM_PAGE_READ) < 0)
return false;
#if EMULATED_PPC
// Allocate alternate stack for PowerPC interrupt routine
sig_stack = zero_page + page_size;
if (vm_acquire_fixed((char *)sig_stack, SIG_STACK_SIZE) < 0)
return false;
#endif
top = base + size;
return true;
}
@ -1792,8 +1813,18 @@ bool SheepMem::Init(void)
void SheepMem::Exit(void)
{
if (top) {
// The zero page is next to SheepShaver globals
vm_release((void *)base, size + getpagesize());
const int page_size = getpagesize();
// Delete SheepShaver globals
vm_release((void *)base, size);
// Delete zero page
vm_release((void *)zero_page, page_size);
#if EMULATED_PPC
// Delete alternate stack for PowerPC interrupt routine
vm_release((void *)sig_stack, SIG_STACK_SIZE);
#endif
}
}

6
SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
View File

@ -73,6 +73,9 @@ static void enter_mon(void)
#endif
}
// From main_*.cpp
extern uintptr SignalStackBase();
// PowerPC EmulOp to exit from emulation looop
const uint32 POWERPC_EXEC_RETURN = POWERPC_EMUL_OP | 1;
@ -268,8 +271,7 @@ void sheepshaver_cpu::interrupt(uint32 entry)
#endif
// Initialize stack pointer to SheepShaver alternate stack base
SheepArray<64> stack_area;
gpr(1) = stack_area.addr();
gpr(1) = SignalStackBase() - 64;
// Build trampoline to return from interrupt
SheepVar32 trampoline = POWERPC_EXEC_RETURN;