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VM: Refactor mach_signal to Factor style

db4
Erik Charlebois 2013-05-11 22:11:09 -04:00
parent 0b5a12fdea
commit 302826c7be
2 changed files with 193 additions and 236 deletions
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221
vm/mach_signal.cpp
View File

@ -12,106 +12,95 @@ Modified for Factor by Slava Pestov */
#include "master.hpp"
namespace factor
{
namespace factor {
/* The exception port on which our thread listens. */
mach_port_t our_exception_port;
/* The following sources were used as a *reference* for this exception handling
code:
1. Apple's mach/xnu documentation
2. Timothy J. Wood's "Mach Exception Handlers 101" post to the
omnigroup's macosx-dev list.
http://www.wodeveloper.com/omniLists/macosx-dev/2000/June/msg00137.html */
code:
1. Apple's mach/xnu documentation
2. Timothy J. Wood's "Mach Exception Handlers 101" post to the
omnigroup's macosx-dev list.
http://www.wodeveloper.com/omniLists/macosx-dev/2000/June/msg00137.html */
/* Modify a suspended thread's thread_state so that when the thread resumes
executing, the call frame of the current C primitive (if any) is rewound, and
the appropriate Factor error is thrown from the top-most Factor frame. */
void factor_vm::call_fault_handler(
exception_type_t exception,
executing, the call frame of the current C primitive (if any) is rewound, and
the appropriate Factor error is thrown from the top-most Factor frame. */
void factor_vm::call_fault_handler(exception_type_t exception,
exception_data_type_t code,
MACH_EXC_STATE_TYPE *exc_state,
MACH_THREAD_STATE_TYPE *thread_state,
MACH_FLOAT_STATE_TYPE *float_state)
{
MACH_EXC_STATE_TYPE* exc_state,
MACH_THREAD_STATE_TYPE* thread_state,
MACH_FLOAT_STATE_TYPE* float_state) {
cell handler = 0;
if(exception == EXC_BAD_ACCESS)
{
if (exception == EXC_BAD_ACCESS) {
signal_fault_addr = MACH_EXC_STATE_FAULT(exc_state);
signal_fault_pc = (cell)MACH_PROGRAM_COUNTER(thread_state);
signal_fault_pc = (cell) MACH_PROGRAM_COUNTER(thread_state);
verify_memory_protection_error(signal_fault_addr);
handler = (cell)factor::memory_signal_handler_impl;
}
else if(exception == EXC_ARITHMETIC && code != MACH_EXC_INTEGER_DIV)
{
handler = (cell) factor::memory_signal_handler_impl;
} else if (exception == EXC_ARITHMETIC && code != MACH_EXC_INTEGER_DIV) {
signal_fpu_status = fpu_status(mach_fpu_status(float_state));
mach_clear_fpu_status(float_state);
handler = (cell)factor::fp_signal_handler_impl;
}
else
{
switch(exception)
{
case EXC_ARITHMETIC: signal_number = SIGFPE; break;
case EXC_BAD_INSTRUCTION: signal_number = SIGILL; break;
default: signal_number = SIGABRT; break;
handler = (cell) factor::fp_signal_handler_impl;
} else {
switch (exception) {
case EXC_ARITHMETIC:
signal_number = SIGFPE;
break;
case EXC_BAD_INSTRUCTION:
signal_number = SIGILL;
break;
default:
signal_number = SIGABRT;
break;
}
handler = (cell)factor::synchronous_signal_handler_impl;
handler = (cell) factor::synchronous_signal_handler_impl;
}
FACTOR_ASSERT(handler != 0);
dispatch_signal_handler(
(cell*)&MACH_STACK_POINTER(thread_state),
dispatch_signal_handler((cell*)&MACH_STACK_POINTER(thread_state),
(cell*)&MACH_PROGRAM_COUNTER(thread_state),
(cell)handler
);
(cell) handler);
}
static void call_fault_handler(
mach_port_t thread,
exception_type_t exception,
static void call_fault_handler(mach_port_t thread, exception_type_t exception,
exception_data_type_t code,
MACH_EXC_STATE_TYPE *exc_state,
MACH_THREAD_STATE_TYPE *thread_state,
MACH_FLOAT_STATE_TYPE *float_state)
{
MACH_EXC_STATE_TYPE* exc_state,
MACH_THREAD_STATE_TYPE* thread_state,
MACH_FLOAT_STATE_TYPE* float_state) {
/* Look up the VM instance involved */
THREADHANDLE thread_id = pthread_from_mach_thread_np(thread);
FACTOR_ASSERT(thread_id);
std::map<THREADHANDLE, factor_vm*>::const_iterator vm = thread_vms.find(thread_id);
std::map<THREADHANDLE, factor_vm*>::const_iterator vm =
thread_vms.find(thread_id);
/* Handle the exception */
if (vm != thread_vms.end())
vm->second->call_fault_handler(exception,code,exc_state,thread_state,float_state);
vm->second->call_fault_handler(exception, code, exc_state, thread_state,
float_state);
}
/* Handle an exception by invoking the user's fault handler and/or forwarding
the duty to the previously installed handlers. */
extern "C"
kern_return_t
catch_exception_raise (mach_port_t exception_port,
mach_port_t thread,
mach_port_t task,
exception_type_t exception,
exception_data_t code,
mach_msg_type_number_t code_count)
{
the duty to the previously installed handlers. */
extern "C" kern_return_t catch_exception_raise(
mach_port_t exception_port, mach_port_t thread, mach_port_t task,
exception_type_t exception, exception_data_t code,
mach_msg_type_number_t code_count) {
/* 10.6 likes to report exceptions from child processes too. Ignore those */
if(task != mach_task_self()) return KERN_FAILURE;
if (task != mach_task_self())
return KERN_FAILURE;
/* Get fault information and the faulting thread's register contents..
See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/thread_get_state.html. */
MACH_EXC_STATE_TYPE exc_state;
mach_msg_type_number_t exc_state_count = MACH_EXC_STATE_COUNT;
if (thread_get_state (thread, MACH_EXC_STATE_FLAVOR,
(natural_t *)&exc_state, &exc_state_count)
!= KERN_SUCCESS)
{
if (thread_get_state(thread, MACH_EXC_STATE_FLAVOR, (natural_t*)&exc_state,
&exc_state_count) !=
KERN_SUCCESS) {
/* The thread is supposed to be suspended while the exception
handler is called. This shouldn't fail. */
return KERN_FAILURE;
@ -119,10 +108,9 @@ catch_exception_raise (mach_port_t exception_port,
MACH_THREAD_STATE_TYPE thread_state;
mach_msg_type_number_t thread_state_count = MACH_THREAD_STATE_COUNT;
if (thread_get_state (thread, MACH_THREAD_STATE_FLAVOR,
(natural_t *)&thread_state, &thread_state_count)
!= KERN_SUCCESS)
{
if (thread_get_state(thread, MACH_THREAD_STATE_FLAVOR,
(natural_t*)&thread_state, &thread_state_count) !=
KERN_SUCCESS) {
/* The thread is supposed to be suspended while the exception
handler is called. This shouldn't fail. */
return KERN_FAILURE;
@ -130,10 +118,9 @@ catch_exception_raise (mach_port_t exception_port,
MACH_FLOAT_STATE_TYPE float_state;
mach_msg_type_number_t float_state_count = MACH_FLOAT_STATE_COUNT;
if (thread_get_state (thread, MACH_FLOAT_STATE_FLAVOR,
(natural_t *)&float_state, &float_state_count)
!= KERN_SUCCESS)
{
if (thread_get_state(thread, MACH_FLOAT_STATE_FLAVOR,
(natural_t*)&float_state, &float_state_count) !=
KERN_SUCCESS) {
/* The thread is supposed to be suspended while the exception
handler is called. This shouldn't fail. */
return KERN_FAILURE;
@ -141,22 +128,20 @@ catch_exception_raise (mach_port_t exception_port,
/* Modify registers so to have the thread resume executing the
fault handler */
call_fault_handler(thread,exception,code[0],&exc_state,&thread_state,&float_state);
call_fault_handler(thread, exception, code[0], &exc_state, &thread_state,
&float_state);
/* Set the faulting thread's register contents..
See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/thread_set_state.html. */
if (thread_set_state (thread, MACH_FLOAT_STATE_FLAVOR,
(natural_t *)&float_state, float_state_count)
!= KERN_SUCCESS)
{
if (thread_set_state(thread, MACH_FLOAT_STATE_FLAVOR,
(natural_t*)&float_state, float_state_count) !=
KERN_SUCCESS) {
return KERN_FAILURE;
}
if (thread_set_state (thread, MACH_THREAD_STATE_FLAVOR,
(natural_t *)&thread_state, thread_state_count)
!= KERN_SUCCESS)
{
if (thread_set_state(thread, MACH_THREAD_STATE_FLAVOR,
(natural_t*)&thread_state, thread_state_count) !=
KERN_SUCCESS) {
return KERN_FAILURE;
}
@ -164,91 +149,83 @@ catch_exception_raise (mach_port_t exception_port,
}
/* The main function of the thread listening for exceptions. */
static void *
mach_exception_thread (void *arg)
{
for (;;)
{
static void* mach_exception_thread(void* arg) {
for (;;) {
/* These two structures contain some private kernel data. We don't need
to access any of it so we don't bother defining a proper struct. The
correct definitions are in the xnu source code. */
/* Buffer for a message to be received. */
struct
{
struct {
mach_msg_header_t head;
mach_msg_body_t msgh_body;
char data[1024];
}
msg;
} msg;
/* Buffer for a reply message. */
struct
{
struct {
mach_msg_header_t head;
char data[1024];
}
reply;
} reply;
mach_msg_return_t retval;
/* Wait for a message on the exception port. */
retval = mach_msg (&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0,
sizeof (msg), our_exception_port,
MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (retval != MACH_MSG_SUCCESS)
{
abort ();
retval =
mach_msg(&msg.head, MACH_RCV_MSG | MACH_RCV_LARGE, 0, sizeof(msg),
our_exception_port, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (retval != MACH_MSG_SUCCESS) {
abort();
}
/* Handle the message: Call exc_server, which will call
catch_exception_raise and produce a reply message. */
exc_server (&msg.head, &reply.head);
exc_server(&msg.head, &reply.head);
/* Send the reply. */
if (mach_msg (&reply.head, MACH_SEND_MSG, reply.head.msgh_size,
0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL)
!= MACH_MSG_SUCCESS)
{
abort ();
if (mach_msg(&reply.head, MACH_SEND_MSG, reply.head.msgh_size, 0,
MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL) !=
MACH_MSG_SUCCESS) {
abort();
}
}
return NULL; // quiet warning
}
/* Initialize the Mach exception handler thread. */
void mach_initialize ()
{
void mach_initialize() {
mach_port_t self;
exception_mask_t mask;
self = mach_task_self ();
self = mach_task_self();
/* Allocate a port on which the thread shall listen for exceptions. */
if (mach_port_allocate (self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port)
!= KERN_SUCCESS)
fatal_error("mach_port_allocate() failed",0);
if (mach_port_allocate(self, MACH_PORT_RIGHT_RECEIVE, &our_exception_port) !=
KERN_SUCCESS)
fatal_error("mach_port_allocate() failed", 0);
/* See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html. */
if (mach_port_insert_right (self, our_exception_port, our_exception_port,
MACH_MSG_TYPE_MAKE_SEND)
!= KERN_SUCCESS)
fatal_error("mach_port_insert_right() failed",0);
/* See
* http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/mach_port_insert_right.html.
*/
if (mach_port_insert_right(self, our_exception_port, our_exception_port,
MACH_MSG_TYPE_MAKE_SEND) !=
KERN_SUCCESS)
fatal_error("mach_port_insert_right() failed", 0);
/* The exceptions we want to catch. */
mask = EXC_MASK_BAD_ACCESS | EXC_MASK_BAD_INSTRUCTION | EXC_MASK_ARITHMETIC;
/* Create the thread listening on the exception port. */
start_thread(mach_exception_thread,NULL);
start_thread(mach_exception_thread, NULL);
/* Replace the exception port info for these exceptions with our own.
Note that we replace the exception port for the entire task, not only
for a particular thread. This has the effect that when our exception
port gets the message, the thread specific exception port has already
been asked, and we don't need to bother about it.
See http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */
if (task_set_exception_ports (self, mask, our_exception_port,
EXCEPTION_DEFAULT, MACHINE_THREAD_STATE)
!= KERN_SUCCESS)
fatal_error("task_set_exception_ports() failed",0);
been asked, and we don't need to bother about it. See
http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/task_set_exception_ports.html. */
if (task_set_exception_ports(self, mask, our_exception_port,
EXCEPTION_DEFAULT, MACHINE_THREAD_STATE) !=
KERN_SUCCESS)
fatal_error("task_set_exception_ports() failed", 0);
}
}

56
vm/mach_signal.hpp
View File

@ -36,48 +36,28 @@ Modified for Factor by Slava Pestov */
allowing the thread to continue from the point of the exception; otherwise,
no reply message is sent and the called routine must have dealt with the
exception thread directly. */
extern "C" boolean_t exc_server (mach_msg_header_t *request_msg, mach_msg_header_t *reply_msg);
extern "C" boolean_t exc_server(mach_msg_header_t* request_msg,
mach_msg_header_t* reply_msg);
/* http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/catch_exception_raise.html
These functions are defined in this file, and called by exc_server.
FIXME: What needs to be done when this code is put into a shared library? */
extern "C"
kern_return_t
catch_exception_raise (mach_port_t exception_port,
mach_port_t thread,
mach_port_t task,
exception_type_t exception,
exception_data_t code,
extern "C" kern_return_t catch_exception_raise(
mach_port_t exception_port, mach_port_t thread, mach_port_t task,
exception_type_t exception, exception_data_t code,
mach_msg_type_number_t code_count);
extern "C"
kern_return_t
catch_exception_raise_state (mach_port_t exception_port,
exception_type_t exception,
exception_data_t code,
mach_msg_type_number_t code_count,
thread_state_flavor_t *flavor,
thread_state_t in_state,
mach_msg_type_number_t in_state_count,
thread_state_t out_state,
mach_msg_type_number_t *out_state_count);
extern "C" kern_return_t catch_exception_raise_state(
mach_port_t exception_port, exception_type_t exception,
exception_data_t code, mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor, thread_state_t in_state,
mach_msg_type_number_t in_state_count, thread_state_t out_state,
mach_msg_type_number_t* out_state_count);
extern "C"
kern_return_t
catch_exception_raise_state_identity (mach_port_t exception_port,
mach_port_t thread,
mach_port_t task,
exception_type_t exception,
exception_data_t code,
mach_msg_type_number_t codeCnt,
thread_state_flavor_t *flavor,
thread_state_t in_state,
mach_msg_type_number_t in_state_count,
thread_state_t out_state,
mach_msg_type_number_t *out_state_count);
extern "C" kern_return_t catch_exception_raise_state_identity(
mach_port_t exception_port, mach_port_t thread, mach_port_t task,
exception_type_t exception, exception_data_t code,
mach_msg_type_number_t codeCnt, thread_state_flavor_t* flavor,
thread_state_t in_state, mach_msg_type_number_t in_state_count,
thread_state_t out_state, mach_msg_type_number_t* out_state_count);
namespace factor
{
void mach_initialize ();
}
namespace factor { void mach_initialize(); }