#include <mach/mach_error.h>
#include <mach/mach_types.h>
#include <mach/sync_policy.h>
+#include <mach/vm_region.h>
#include <mach/machine/thread_state.h>
#include <mach/machine/thread_status.h>
#include <sys/_types.h>
#ifdef LISP_FEATURE_SB_THREAD
pthread_mutex_t modify_ldt_lock = PTHREAD_MUTEX_INITIALIZER;
-pthread_mutex_t mach_exception_lock = PTHREAD_MUTEX_INITIALIZER;
void set_data_desc_size(data_desc_t* desc, unsigned long size)
{
: : "r" (thread_state), "r" (float_state));
}
+/* Convenience wrapper for the above */
+void call_handler_on_thread(mach_port_t thread,
+ x86_thread_state32_t *thread_state,
+ int signal,
+ siginfo_t *siginfo,
+ void (*handler)(int, siginfo_t *, void *))
+{
+ x86_thread_state32_t new_state;
+ x86_thread_state32_t *save_thread_state;
+ x86_float_state32_t *save_float_state;
+ mach_msg_type_number_t state_count;
+ siginfo_t *save_siginfo;
+ kern_return_t ret;
+ /* Initialize the new state */
+ new_state = *thread_state;
+ open_stack_allocation(&new_state);
+ /* Save old state */
+ save_thread_state = (x86_thread_state32_t *)stack_allocate(&new_state, sizeof(*save_thread_state));
+ *save_thread_state = *thread_state;
+ /* Save float state */
+ save_float_state = (x86_float_state32_t *)stack_allocate(&new_state, sizeof(*save_float_state));
+ state_count = x86_FLOAT_STATE32_COUNT;
+ if ((ret = thread_get_state(thread,
+ x86_FLOAT_STATE32,
+ (thread_state_t)save_float_state,
+ &state_count)) != KERN_SUCCESS)
+ lose("thread_get_state (x86_THREAD_STATE32) failed %d\n", ret);
+ /* Set up siginfo */
+ save_siginfo = stack_allocate(&new_state, sizeof(*siginfo));
+ if (siginfo == NULL)
+ save_siginfo = siginfo;
+ else
+ *save_siginfo = *siginfo;
+ /* Prepare to call */
+ call_c_function_in_context(&new_state,
+ signal_emulation_wrapper,
+ 5,
+ save_thread_state,
+ save_float_state,
+ signal,
+ save_siginfo,
+ handler);
+ /* Update the thread state */
+ state_count = x86_THREAD_STATE32_COUNT;
+ if ((ret = thread_set_state(thread,
+ x86_THREAD_STATE32,
+ (thread_state_t)&new_state,
+ state_count)) != KERN_SUCCESS)
+ lose("thread_set_state (x86_FLOAT_STATE32) failed %d\n", ret);
+
+}
+
#if defined DUMP_CONTEXT
void dump_context(x86_thread_state32_t *context)
{
exception_data_t code_vector,
mach_msg_type_number_t code_count)
{
- kern_return_t ret;
- int signal;
- siginfo_t* siginfo;
-
- thread_mutex_lock(&mach_exception_lock);
-
- x86_thread_state32_t thread_state;
- mach_msg_type_number_t thread_state_count = x86_THREAD_STATE32_COUNT;
-
- x86_float_state32_t float_state;
- mach_msg_type_number_t float_state_count = x86_FLOAT_STATE32_COUNT;
-
- x86_exception_state32_t exception_state;
- mach_msg_type_number_t exception_state_count = x86_EXCEPTION_STATE32_COUNT;
-
- x86_thread_state32_t backup_thread_state;
- x86_thread_state32_t *target_thread_state;
- x86_float_state32_t *target_float_state;
-
- os_vm_address_t addr;
-
struct thread *th = (struct thread*) exception_port;
+ x86_thread_state32_t thread_state;
+ mach_msg_type_number_t state_count;
+ vm_address_t region_addr;
+ vm_size_t region_size;
+ vm_region_basic_info_data_t region_info;
+ mach_msg_type_number_t info_count;
+ mach_port_t region_name;
+ void *addr = NULL;
+ int signal = 0;
+ void (*handler)(int, siginfo_t *, void *) = NULL;
+ siginfo_t siginfo;
+ kern_return_t ret;
- FSHOW((stderr,"/entering catch_exception_raise with exception: %d\n", exception));
-
+ /* Get state and info */
+ state_count = x86_THREAD_STATE32_COUNT;
+ if ((ret = thread_get_state(thread,
+ x86_THREAD_STATE32,
+ (thread_state_t)&thread_state,
+ &state_count)) != KERN_SUCCESS)
+ lose("thread_get_state (x86_THREAD_STATE32) failed %d\n", ret);
switch (exception) {
-
case EXC_BAD_ACCESS:
signal = SIGBUS;
- ret = thread_get_state(thread,
- x86_THREAD_STATE32,
- (thread_state_t)&thread_state,
- &thread_state_count);
- ret = thread_get_state(thread,
- x86_FLOAT_STATE32,
- (thread_state_t)&float_state,
- &float_state_count);
- ret = thread_get_state(thread,
- x86_EXCEPTION_STATE32,
- (thread_state_t)&exception_state,
- &exception_state_count);
- addr = (void*)exception_state.faultvaddr;
-
-
- /* note the os_context hackery here. When the signal handler returns,
- * it won't go back to what it was doing ... */
- if(addr >= CONTROL_STACK_GUARD_PAGE(th) &&
- addr < CONTROL_STACK_GUARD_PAGE(th) + os_vm_page_size) {
- /* We hit the end of the control stack: disable guard page
- * protection so the error handler has some headroom, protect the
- * previous page so that we can catch returns from the guard page
- * and restore it. */
+ /* Check if write protection fault */
+ if ((code_vector[0] & OS_VM_PROT_ALL) == 0) {
+ ret = KERN_INVALID_RIGHT;
+ break;
+ }
+ /* Get vm_region info */
+ region_addr = (vm_address_t)code_vector[1];
+ info_count = VM_REGION_BASIC_INFO_COUNT;
+ if ((ret = vm_region(mach_task_self(),
+ ®ion_addr,
+ ®ion_size,
+ VM_REGION_BASIC_INFO,
+ (vm_region_info_t)®ion_info,
+ &info_count,
+ ®ion_name)))
+ lose("vm_region (VM_REGION_BASIC_INFO) failed failed %d\n", ret);
+ /* Check if still protected */
+ if ((region_info.protection & OS_VM_PROT_ALL) == 0) {
+ /* KLUDGE:
+ * If two threads fault on the same page, the protection
+ * is cleared as the first thread runs memory_fault_handler.
+ * Grep for "not marked as write-protected" in gencgc.c
+ */
+ ret = KERN_SUCCESS;
+ break;
+ }
+ addr = (void*)code_vector[1];
+ /* At stack guard */
+ if (os_trunc_to_page(addr) == CONTROL_STACK_GUARD_PAGE(th)) {
protect_control_stack_guard_page_thread(0, th);
protect_control_stack_return_guard_page_thread(1, th);
-
- backup_thread_state = thread_state;
- open_stack_allocation(&thread_state);
-
- /* Save thread state */
- target_thread_state =
- stack_allocate(&thread_state, sizeof(*target_thread_state));
- (*target_thread_state) = backup_thread_state;
-
- /* Save float state */
- target_float_state =
- stack_allocate(&thread_state, sizeof(*target_float_state));
- (*target_float_state) = float_state;
-
- /* Set up siginfo */
- siginfo = stack_allocate(&thread_state, sizeof(*siginfo));
- /* what do we need to put in our fake siginfo? It looks like
- * the x86 code only uses si_signo and si_adrr. */
- siginfo->si_signo = signal;
- siginfo->si_addr = (void*)exception_state.faultvaddr;
-
- call_c_function_in_context(&thread_state,
- signal_emulation_wrapper,
- 5,
- target_thread_state,
- target_float_state,
- signal,
- siginfo,
- control_stack_exhausted_handler);
+ handler = control_stack_exhausted_handler;
+ break;
}
- else if(addr >= CONTROL_STACK_RETURN_GUARD_PAGE(th) &&
- addr < CONTROL_STACK_RETURN_GUARD_PAGE(th) + os_vm_page_size) {
- /* We're returning from the guard page: reprotect it, and
- * unprotect this one. This works even if we somehow missed
- * the return-guard-page, and hit it on our way to new
- * exhaustion instead. */
+ /* Return from stack guard */
+ if (os_trunc_to_page(addr) == CONTROL_STACK_RETURN_GUARD_PAGE(th)) {
protect_control_stack_guard_page_thread(1, th);
protect_control_stack_return_guard_page_thread(0, th);
+ break;
}
- else if (addr >= undefined_alien_address &&
- addr < undefined_alien_address + os_vm_page_size) {
- backup_thread_state = thread_state;
- open_stack_allocation(&thread_state);
-
- /* Save thread state */
- target_thread_state =
- stack_allocate(&thread_state, sizeof(*target_thread_state));
- (*target_thread_state) = backup_thread_state;
-
- target_float_state =
- stack_allocate(&thread_state, sizeof(*target_float_state));
- (*target_float_state) = float_state;
-
- /* Set up siginfo */
- siginfo = stack_allocate(&thread_state, sizeof(*siginfo));
- /* what do we need to put in our fake siginfo? It looks like
- * the x86 code only uses si_signo and si_adrr. */
- siginfo->si_signo = signal;
- siginfo->si_addr = (void*)exception_state.faultvaddr;
-
- call_c_function_in_context(&thread_state,
- signal_emulation_wrapper,
- 5,
- target_thread_state,
- target_float_state,
- signal,
- siginfo,
- undefined_alien_handler);
- } else {
-
- backup_thread_state = thread_state;
- open_stack_allocation(&thread_state);
-
- /* Save thread state */
- target_thread_state =
- stack_allocate(&thread_state, sizeof(*target_thread_state));
- (*target_thread_state) = backup_thread_state;
-
- target_float_state =
- stack_allocate(&thread_state, sizeof(*target_float_state));
- (*target_float_state) = float_state;
-
- /* Set up siginfo */
- siginfo = stack_allocate(&thread_state, sizeof(*siginfo));
- /* what do we need to put in our fake siginfo? It looks like
- * the x86 code only uses si_signo and si_adrr. */
- siginfo->si_signo = signal;
- siginfo->si_addr = (void*)exception_state.faultvaddr;
-
- call_c_function_in_context(&thread_state,
- signal_emulation_wrapper,
- 5,
- target_thread_state,
- target_float_state,
- signal,
- siginfo,
- memory_fault_handler);
+ /* Undefined alien */
+ if (os_trunc_to_page(addr) == undefined_alien_address) {
+ handler = undefined_alien_handler;
+ break;
}
- ret = thread_set_state(thread,
- x86_THREAD_STATE32,
- (thread_state_t)&thread_state,
- thread_state_count);
-
- ret = thread_set_state(thread,
- x86_FLOAT_STATE32,
- (thread_state_t)&float_state,
- float_state_count);
- thread_mutex_unlock(&mach_exception_lock);
- return KERN_SUCCESS;
-
+ /* Regular memory fault */
+ handler = memory_fault_handler;
+ break;
case EXC_BAD_INSTRUCTION:
-
- ret = thread_get_state(thread,
- x86_THREAD_STATE32,
- (thread_state_t)&thread_state,
- &thread_state_count);
- ret = thread_get_state(thread,
- x86_FLOAT_STATE32,
- (thread_state_t)&float_state,
- &float_state_count);
- ret = thread_get_state(thread,
- x86_EXCEPTION_STATE32,
- (thread_state_t)&exception_state,
- &exception_state_count);
- if (0xffff0b0f == *((u32 *)thread_state.eip)) {
- /* fake sigreturn. */
-
- /* When we get here, thread_state.eax is a pointer to a
- * thread_state to restore. */
- /* thread_state = *((thread_state_t *)thread_state.eax); */
-
- ret = thread_set_state(thread,
- x86_THREAD_STATE32,
- (thread_state_t) thread_state.eax,
- /* &thread_state, */
- thread_state_count);
-
- ret = thread_set_state(thread,
- x86_FLOAT_STATE32,
- (thread_state_t) thread_state.ebx,
- /* &thread_state, */
- float_state_count);
- } else {
-
- backup_thread_state = thread_state;
- open_stack_allocation(&thread_state);
-
- /* Save thread state */
- target_thread_state =
- stack_allocate(&thread_state, sizeof(*target_thread_state));
- (*target_thread_state) = backup_thread_state;
-
- target_float_state =
- stack_allocate(&thread_state, sizeof(*target_float_state));
- (*target_float_state) = float_state;
-
- /* Set up siginfo */
- siginfo = stack_allocate(&thread_state, sizeof(*siginfo));
- /* what do we need to put in our fake siginfo? It looks like
- * the x86 code only uses si_signo and si_adrr. */
- if (*((unsigned short *)target_thread_state->eip) == 0x0b0f) {
- signal = SIGTRAP;
- siginfo->si_signo = signal;
- siginfo->si_addr = (void*)exception_state.faultvaddr;
- target_thread_state->eip += 2;
- call_c_function_in_context(&thread_state,
- signal_emulation_wrapper,
- 5,
- target_thread_state,
- target_float_state,
- signal,
- siginfo,
- sigtrap_handler);
- } else {
- signal = SIGILL;
- siginfo->si_signo = signal;
- siginfo->si_addr = (void*)exception_state.faultvaddr;
-
- call_c_function_in_context(&thread_state,
- signal_emulation_wrapper,
- 5,
- target_thread_state,
- target_float_state,
- signal,
- siginfo,
- sigill_handler);
- }
- ret = thread_set_state(thread,
- x86_THREAD_STATE32,
- (thread_state_t)&thread_state,
- thread_state_count);
- ret = thread_set_state(thread,
- x86_FLOAT_STATE32,
- (thread_state_t)&float_state,
- float_state_count);
+ signal = SIGTRAP;
+ /* Check if illegal instruction trap */
+ if (code_vector[0] != EXC_I386_INVOP) {
+ ret = KERN_INVALID_RIGHT;
+ break;
}
- thread_mutex_unlock(&mach_exception_lock);
- return KERN_SUCCESS;
-
+ /* Check if UD2 instruction */
+ if (*(unsigned short *)thread_state.eip != 0x0b0f) {
+ /* KLUDGE: There are two ways we could get here:
+ * 1) We're executing data and we've hit some truly
+ * illegal opcode, of which there are a few, see
+ * Intel 64 and IA-32 Architectures
+ * Sofware Developer's Manual
+ * Volume 3A page 5-34)
+ * 2) The kernel started an unrelated signal handler
+ * before we got a chance to run. The context that
+ * caused the exception is saved in a stack frame
+ * somewhere down below.
+ * In either case we rely on the exception to retrigger,
+ * eventually bailing out if we're spinning on case 2).
+ */
+ static mach_port_t last_thread;
+ static unsigned int last_eip;
+ if (last_thread == thread && last_eip == thread_state.eip)
+ ret = KERN_INVALID_RIGHT;
+ else
+ ret = KERN_SUCCESS;
+ last_thread = thread;
+ last_eip = thread_state.eip;
+ break;
+ }
+ /* Skip the trap code */
+ thread_state.eip += 2;
+ /* Return from handler? */
+ if (*(unsigned short *)thread_state.eip == 0xffff) {
+ if ((ret = thread_set_state(thread,
+ x86_THREAD_STATE32,
+ (thread_state_t)thread_state.eax,
+ x86_THREAD_STATE32_COUNT)) != KERN_SUCCESS)
+ lose("thread_set_state (x86_THREAD_STATE32) failed %d\n", ret);
+ if ((ret = thread_set_state(thread,
+ x86_FLOAT_STATE32,
+ (thread_state_t)thread_state.ebx,
+ x86_FLOAT_STATE32_COUNT)) != KERN_SUCCESS)
+ lose("thread_set_state (x86_FLOAT_STATE32) failed %d\n", ret);
+ break;
+ }
+ /* Trap call */
+ handler = sigtrap_handler;
+ break;
default:
- thread_mutex_unlock(&mach_exception_lock);
- return KERN_INVALID_RIGHT;
+ ret = KERN_INVALID_RIGHT;
+ }
+ /* Call handler */
+ if (handler != 0) {
+ siginfo.si_signo = signal;
+ siginfo.si_addr = addr;
+ call_handler_on_thread(thread, &thread_state, signal, &siginfo, handler);
}
+ return ret;
}
void *
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