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Fix instruction skipping on MacOS X in the fast path case.

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This commit is contained in:
gbeauche 2007-12-31 18:07:01 +00:00
parent b5ac365858
commit 26f9b1d38b
1 changed files with 40 additions and 19 deletions
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59
BasiliskII/src/Unix/sigsegv.cpp
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@ -1676,19 +1676,46 @@ struct sigsegv_info_t {
#endif
};
#ifdef HAVE_MACH_EXCEPTIONS
static void mach_get_exception_state(sigsegv_info_t *sip)
{
sip->exc_state_count = SIGSEGV_EXCEPTION_STATE_COUNT;
kern_return_t krc = thread_get_state(sip->thread,
SIGSEGV_EXCEPTION_STATE_FLAVOR,
(natural_t *)&sip->exc_state,
&sip->exc_state_count);
MACH_CHECK_ERROR(thread_get_state, krc);
sip->has_exc_state = true;
}
static void mach_get_thread_state(sigsegv_info_t *sip)
{
sip->thr_state_count = SIGSEGV_THREAD_STATE_COUNT;
kern_return_t krc = thread_get_state(sip->thread,
SIGSEGV_THREAD_STATE_FLAVOR,
(natural_t *)&sip->thr_state,
&sip->thr_state_count);
MACH_CHECK_ERROR(thread_get_state, krc);
sip->has_thr_state = true;
}
static void mach_set_thread_state(sigsegv_info_t *sip)
{
kern_return_t krc = thread_set_state(sip->thread,
SIGSEGV_THREAD_STATE_FLAVOR,
(natural_t *)&sip->thr_state,
sip->thr_state_count);
MACH_CHECK_ERROR(thread_set_state, krc);
}
#endif
// Return the address of the invalid memory reference
sigsegv_address_t sigsegv_get_fault_address(sigsegv_info_t *sip)
{
#ifdef HAVE_MACH_EXCEPTIONS
static int use_fast_path = -1;
if (use_fast_path != 1 && !sip->has_exc_state) {
sip->exc_state_count = SIGSEGV_EXCEPTION_STATE_COUNT;
kern_return_t krc = thread_get_state(sip->thread,
SIGSEGV_EXCEPTION_STATE_FLAVOR,
(natural_t *)&sip->exc_state,
&sip->exc_state_count);
MACH_CHECK_ERROR(thread_get_state, krc);
sip->has_exc_state = true;
mach_get_exception_state(sip);
sigsegv_address_t addr = (sigsegv_address_t)SIGSEGV_FAULT_ADDRESS;
if (use_fast_path < 0)
@ -1705,13 +1732,7 @@ sigsegv_address_t sigsegv_get_fault_instruction_address(sigsegv_info_t *sip)
{
#ifdef HAVE_MACH_EXCEPTIONS
if (!sip->has_thr_state) {
sip->thr_state_count = SIGSEGV_THREAD_STATE_COUNT;
kern_return_t krc = thread_get_state(sip->thread,
SIGSEGV_THREAD_STATE_FLAVOR,
(natural_t *)&sip->thr_state,
&sip->thr_state_count);
MACH_CHECK_ERROR(thread_get_state, krc);
sip->has_thr_state = true;
mach_get_thread_state(sip);
sip->pc = (sigsegv_address_t)SIGSEGV_FAULT_INSTRUCTION;
}
@ -1742,17 +1763,17 @@ static bool handle_badaccess(SIGSEGV_FAULT_HANDLER_ARGLIST_1)
case SIGSEGV_RETURN_SKIP_INSTRUCTION:
// Call the instruction skipper with the register file
// available
#ifdef HAVE_MACH_EXCEPTIONS
if (!sip->has_thr_state)
mach_get_thread_state(sip);
#endif
if (SIGSEGV_SKIP_INSTRUCTION(SIGSEGV_REGISTER_FILE)) {
#ifdef HAVE_MACH_EXCEPTIONS
// Unlike UNIX signals where the thread state
// is modified off of the stack, in Mach we
// need to actually call thread_set_state to
// have the register values updated.
kern_return_t krc = thread_set_state(sip->thread,
SIGSEGV_THREAD_STATE_FLAVOR,
(natural_t *)&sip->thr_state,
sip->thr_state_count);
MACH_CHECK_ERROR(thread_set_state, krc);
mach_set_thread_state(sip);
#endif
return true;
}