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New SIGSEGV API so that skip-instruction requests are more explicit. Yes,

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that's api change, but that's cooler now for SheepShaver. ;-)
This commit is contained in:
gbeauche 2003-09-29 07:02:58 +00:00
parent 5b57fde6ce
commit a48a804c15
4 changed files with 52 additions and 99 deletions
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36
BasiliskII/src/Unix/main_unix.cpp
View File

@ -209,6 +209,32 @@ char *strdup(const char *s)
}
/*
* SIGSEGV handler
*/
static sigsegv_return_t sigsegv_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction)
{
#if ENABLE_VOSF
// Handle screen fault
extern bool Screen_fault_handler(sigsegv_address_t, sigsegv_address_t);
if (Screen_fault_handler(fault_address, fault_instruction))
return SIGSEGV_RETURN_SUCCESS;
#endif
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
// Ignore writes to ROM
if (((uintptr)fault_address - (uintptr)ROMBaseHost) < ROMSize)
return SIGSEGV_RETURN_SKIP_INSTRUCTION;
// Ignore all other faults, if requested
if (PrefsFindBool("ignoresegv"))
return SIGSEGV_RETURN_SKIP_INSTRUCTION;
#endif
return SIGSEGV_RETURN_FAILURE;
}
/*
* Dump state when everything went wrong after a SEGV
*/
@ -357,12 +383,10 @@ int main(int argc, char **argv)
if (!PrefsEditor())
QuitEmulator();
// Register request to ignore all segmentation faults
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
if (PrefsFindBool("ignoresegv"))
sigsegv_add_ignore_range(0, ~(0UL), SIGSEGV_TRANSFER_LOAD | SIGSEGV_TRANSFER_STORE);
#endif
// Install the handler for SIGSEGV
if (!sigsegv_install_handler(sigsegv_handler))
return false;
// Register dump state function when we got mad after a segfault
sigsegv_set_dump_state(sigsegv_dump_state);

87
BasiliskII/src/Unix/sigsegv.cpp
View File

@ -45,16 +45,6 @@ using std::list;
// Type of the system signal handler
typedef RETSIGTYPE (*signal_handler)(int);
// Ignore range chain
struct ignore_range_t {
sigsegv_address_t start;
unsigned long length;
int transfer_type;
};
typedef list<ignore_range_t> ignore_range_list_t;
ignore_range_list_t sigsegv_ignore_ranges;
// User's SIGSEGV handler
static sigsegv_fault_handler_t sigsegv_fault_handler = 0;
@ -64,16 +54,6 @@ static sigsegv_state_dumper_t sigsegv_state_dumper = 0;
// Actual SIGSEGV handler installer
static bool sigsegv_do_install_handler(int sig);
// Find ignore range matching address
static inline ignore_range_list_t::iterator sigsegv_find_ignore_range(sigsegv_address_t address)
{
ignore_range_list_t::iterator it;
for (it = sigsegv_ignore_ranges.begin(); it != sigsegv_ignore_ranges.end(); it++)
if (address >= it->start && address < it->start + it->length)
break;
return it;
}
/*
* Instruction decoding aids
@ -610,12 +590,6 @@ static bool powerpc_skip_instruction(unsigned int * nip_p, unsigned int * regs)
return false;
}
ignore_range_list_t::iterator it = sigsegv_find_ignore_range((sigsegv_address_t)instr.addr);
if (it == sigsegv_ignore_ranges.end() || ((it->transfer_type & instr.transfer_type) != instr.transfer_type)) {
// Address doesn't fall into ignore ranges list, let it crash.
return false;
}
#if DEBUG
printf("%08x: %s %s access", *nip_p,
instr.transfer_size == SIZE_BYTE ? "byte" : instr.transfer_size == SIZE_WORD ? "word" : "long",
@ -661,22 +635,24 @@ static void sigsegv_handler(SIGSEGV_FAULT_HANDLER_ARGLIST)
bool fault_recovered = false;
// Call user's handler and reinstall the global handler, if required
if (sigsegv_fault_handler(fault_address, fault_instruction)) {
switch (sigsegv_fault_handler(fault_address, fault_instruction)) {
case SIGSEGV_RETURN_SUCCESS:
#if (defined(HAVE_SIGACTION) ? defined(SIGACTION_NEED_REINSTALL) : defined(SIGNAL_NEED_REINSTALL))
sigsegv_do_install_handler(sig);
#endif
fault_recovered = true;
}
break;
#if HAVE_SIGSEGV_SKIP_INSTRUCTION
else if (sigsegv_ignore_ranges.size() > 0) {
case SIGSEGV_RETURN_SKIP_INSTRUCTION:
// Call the instruction skipper with the register file available
if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE))
fault_recovered = true;
}
break;
#endif
}
if (!fault_recovered) {
// FAIL: reinstall default handler for "safe" crash
// Failure: reinstall default handler for "safe" crash
#define FAULT_HANDLER(sig) signal(sig, SIG_DFL);
SIGSEGV_ALL_SIGNALS
#undef FAULT_HANDLER
@ -760,43 +736,6 @@ void sigsegv_deinstall_handler(void)
}
/*
* Add SIGSEGV ignore range
*/
void sigsegv_add_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type)
{
ignore_range_t ignore_range;
ignore_range.start = address;
ignore_range.length = length;
ignore_range.transfer_type = transfer_type;
sigsegv_ignore_ranges.push_front(ignore_range);
}
/*
* Remove SIGSEGV ignore range. Range must match installed one, otherwise FALSE is returned.
*/
bool sigsegv_remove_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type)
{
ignore_range_list_t::iterator it;
for (it = sigsegv_ignore_ranges.begin(); it != sigsegv_ignore_ranges.end(); it++)
if (it->start == address && it->length == length && ((it->transfer_type & transfer_type) == transfer_type))
break;
if (it != sigsegv_ignore_ranges.end()) {
if (it->transfer_type != transfer_type)
it->transfer_type &= ~transfer_type;
else
sigsegv_ignore_ranges.erase(it);
return true;
}
return false;
}
/*
* Set callback function when we cannot handle the fault
*/
@ -822,20 +761,22 @@ static int page_size;
static volatile char * page = 0;
static volatile int handler_called = 0;
static bool sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
static sigsegv_return_t sigsegv_test_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
{
handler_called++;
if ((fault_address - 123) != page)
exit(1);
if (vm_protect((char *)((unsigned long)fault_address & -page_size), page_size, VM_PAGE_READ | VM_PAGE_WRITE) != 0)
exit(1);
return true;
return SIGSEGV_RETURN_SUCCESS;
}
#ifdef HAVE_SIGSEGV_SKIP_INSTRUCTION
static bool sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
static sigsegv_return_t sigsegv_insn_handler(sigsegv_address_t fault_address, sigsegv_address_t instruction_address)
{
return false;
if (((unsigned long)fault_address - (unsigned long)page) < page_size)
return SIGSEGV_SRETURN_KIP_INSTRUCTION;
return SIGSEGV_RETURN_FAILURE;
}
#endif
@ -873,8 +814,6 @@ int main(void)
if (vm_protect((char *)page, page_size, VM_PAGE_NOACCESS) < 0)
return 1;
sigsegv_add_ignore_range((char *)page, page_size, SIGSEGV_TRANSFER_LOAD | SIGSEGV_TRANSFER_STORE);
#define TEST_SKIP_INSTRUCTION(TYPE) do { \
const unsigned int TAG = 0x12345678; \
TYPE data = *((TYPE *)(page + sizeof(TYPE))); \

15
BasiliskII/src/Unix/sigsegv.h
View File

@ -34,8 +34,15 @@ enum sigsegv_transfer_type_t {
SIGSEGV_TRANSFER_STORE = 2,
};
// SIGSEGV handler return state
enum sigsegv_return_t {
SIGSEGV_RETURN_SUCCESS,
SIGSEGV_RETURN_FAILURE,
SIGSEGV_RETURN_SKIP_INSTRUCTION,
};
// Type of a SIGSEGV handler. Returns boolean expressing successful operation
typedef bool (*sigsegv_fault_handler_t)(sigsegv_address_t fault_address, sigsegv_address_t instruction_address);
typedef sigsegv_return_t (*sigsegv_fault_handler_t)(sigsegv_address_t fault_address, sigsegv_address_t instruction_address);
// Type of a SIGSEGV state dump function
typedef void (*sigsegv_state_dumper_t)(sigsegv_address_t fault_address, sigsegv_address_t instruction_address);
@ -46,12 +53,6 @@ extern bool sigsegv_install_handler(sigsegv_fault_handler_t handler);
// Remove the user SIGSEGV handler, revert to default behavior
extern void sigsegv_uninstall_handler(void);
// Add SIGSEGV ignore range
extern void sigsegv_add_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type);
// Remove SIGSEGV ignore range. Range must match installed one, otherwise FALSE is returned.
extern bool sigsegv_remove_ignore_range(sigsegv_address_t address, unsigned long length, int transfer_type);
// Set callback function when we cannot handle the fault
extern void sigsegv_set_dump_state(sigsegv_state_dumper_t handler);

13
BasiliskII/src/Unix/video_vosf.h
View File

@ -21,7 +21,7 @@
#ifndef VIDEO_VOSF_H
#define VIDEO_VOSF_H
// Note: this file is #include'd in video_x.cpp
// Note: this file must be #include'd only in video_x.cpp
#ifdef ENABLE_VOSF
#include <fcntl.h>
@ -200,11 +200,6 @@ static uint32 page_extend(uint32 size)
* Initialize the VOSF system (mainBuffer structure, SIGSEGV handler)
*/
#if !EMULATED_PPC && !POWERPC_ROM
static
#endif
bool Screen_fault_handler(sigsegv_address_t fault_address, sigsegv_address_t fault_instruction);
static bool video_vosf_init(X11_MONITOR_INIT)
{
VIDEO_MODE_INIT;
@ -260,12 +255,6 @@ static bool video_vosf_init(X11_MONITOR_INIT)
if (vm_protect((char *)mainBuffer.memStart, mainBuffer.memLength, VM_PAGE_READ) != 0)
return false;
#if !EMULATED_PPC && !POWERPC_ROM
// Initialize the handler for SIGSEGV
if (!sigsegv_install_handler(Screen_fault_handler))
return false;
#endif
// The frame buffer is sane, i.e. there is no write to it yet
mainBuffer.dirty = false;
return true;