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Make SheepShaver work with OS 8.6 out-of-the-box with no extra patch for

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the time being. i.e. ignore writes to the zero page when faking SCSIGlobals
This commit is contained in:
gbeauche 2004-02-24 11:12:54 +00:00
parent 643f9ad5e5
commit ae93ea2f16
5 changed files with 23 additions and 6 deletions
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4
SheepShaver/src/BeOS/main_beos.cpp
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@ -220,6 +220,7 @@ system_info SysInfo; // System information
static void *sig_stack = NULL; // Stack for signal handlers
static void *extra_stack = NULL; // Stack for SIGSEGV inside interrupt handler
uint32 SheepMem::page_size; // Size of a native page
uintptr SheepMem::zero_page = 0; // Address of ro page filled in with zeros
uintptr SheepMem::base; // Address of SheepShaver data
uintptr SheepMem::top; // Top of SheepShaver data (stack like storage)
@ -726,6 +727,9 @@ void SheepShaver::Quit(void)
void SheepShaver::init_rom(void)
{
// Size of a native page
page_size = B_PAGE_SIZE;
// Create area for ROM
void *rom_addr = (void *)ROM_BASE;
rom_area = create_area(ROM_AREA_NAME, &rom_addr, B_EXACT_ADDRESS, ROM_AREA_SIZE, B_NO_LOCK, B_READ_AREA | B_WRITE_AREA);

12
SheepShaver/src/Unix/main_unix.cpp
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@ -273,6 +273,7 @@ static sigregs sigsegv_regs; // Register dump when crashed
static const char *crash_reason = NULL; // Reason of the crash (SIGSEGV, SIGBUS, SIGILL)
#endif
uint32 SheepMem::page_size; // Size of a native page
uintptr SheepMem::zero_page = 0; // Address of ro page filled in with zeros
uintptr SheepMem::base = 0x60000000; // Address of SheepShaver data
uintptr SheepMem::top = 0; // Top of SheepShaver data (stack like storage)
@ -1659,8 +1660,10 @@ static void sigsegv_handler(int sig, siginfo_t *sip, void *scp)
#endif
}
// Ignore ROM writes
if (transfer_type == TYPE_STORE && addr >= ROM_BASE && addr < ROM_BASE + ROM_SIZE) {
// Ignore ROM writes (including to the zero page, which is read-only)
if (transfer_type == TYPE_STORE &&
((addr >= ROM_BASE && addr < ROM_BASE + ROM_SIZE) ||
(addr >= SheepMem::ZeroPage() && addr < SheepMem::ZeroPage() + SheepMem::PageSize()))) {
// D(bug("WARNING: %s write access to ROM at %08lx, pc %08lx\n", transfer_size == SIZE_BYTE ? "Byte" : transfer_size == SIZE_HALFWORD ? "Halfword" : "Word", addr, r->pc()));
if (addr_mode == MODE_U || addr_mode == MODE_UX)
r->gpr(ra) = addr;
@ -1904,7 +1907,8 @@ rti:;
bool SheepMem::Init(void)
{
const int page_size = getpagesize();
// Size of a native page
page_size = getpagesize();
// Allocate SheepShaver globals
if (vm_acquire_fixed((char *)base, size) < 0)
@ -1932,8 +1936,6 @@ bool SheepMem::Init(void)
void SheepMem::Exit(void)
{
if (top) {
const int page_size = getpagesize();
// Delete SheepShaver globals
vm_release((void *)base, size);

7
SheepShaver/src/include/thunks.h
View File

@ -86,6 +86,7 @@ extern uint32 NativeRoutineDescriptor(int selector);
class SheepMem {
static uint32 align(uint32 size);
protected:
static uint32 page_size;
static uintptr zero_page;
static uintptr base;
static uintptr top;
@ -93,6 +94,7 @@ protected:
public:
static bool Init(void);
static void Exit(void);
static uint32 PageSize();
static uintptr ZeroPage();
static uintptr Reserve(uint32 size);
static void Release(uint32 size);
@ -105,6 +107,11 @@ inline uint32 SheepMem::align(uint32 size)
return (size + 3) & -4;
}
inline uint32 SheepMem::PageSize()
{
return page_size;
}
inline uintptr SheepMem::ZeroPage()
{
return zero_page;

4
SheepShaver/src/kpx_cpu/sheepshaver_glue.cpp
View File

@ -715,6 +715,10 @@ static sigsegv_return_t sigsegv_handler(sigsegv_address_t fault_address, sigsegv
else if (pc == ROM_BASE + 0x4a10a0 && (cpu->gpr(20) == 0xf3012002 || cpu->gpr(20) == 0xf3012000))
return SIGSEGV_RETURN_SKIP_INSTRUCTION;
// Ignore writes to the zero page
else if ((uint32)(addr - SheepMem::ZeroPage()) < (uint32)SheepMem::PageSize())
return SIGSEGV_RETURN_SKIP_INSTRUCTION;
// Ignore all other faults, if requested
if (PrefsFindBool("ignoresegv"))
return SIGSEGV_RETURN_SKIP_INSTRUCTION;

2
SheepShaver/src/rom_patches.cpp
View File

@ -2305,7 +2305,7 @@ void InstallDrivers(void)
WriteMacInt16(dce + dCtlFlags, SonyDriverFlags);
}
#if DISABLE_SCSI && 0
#if DISABLE_SCSI && HAVE_SIGSEGV_SKIP_INSTRUCTION
// Fake SCSIGlobals
WriteMacInt32(0xc0c, SheepMem::ZeroPage());
#endif