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Some additions for user debugger support. Several of ToDos. This is far from being final, but just something we can work with for the moment. 

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11310 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2005-02-10 02:53:48 +00:00
parent 1ec1e1185b
commit 6b13343035
1 changed files with 58 additions and 5 deletions
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63
src/kernel/core/signal.c
View File

@ -10,12 +10,14 @@
#include <OS.h>
#include <KernelExport.h>
#include <debug.h>
#include <debugger.h>
#include <thread.h>
#include <team.h>
#include <int.h>
#include <sem.h>
#include <ksignal.h>
#include <syscalls.h>
#include <user_debugger.h>
#include <stddef.h>
#include <string.h>
@ -38,20 +40,47 @@ const char * const sigstr[NSIG] = {
};
/** Expects interrupts off and thread lock held. */
/**
* Expects interrupts off and thread lock held.
* The function may release the lock and enable interrupts temporarily, so the
* caller must be aware that operations before calling this function and after
* its return might not belong to the same atomic section.
*/
int
handle_signals(struct thread *thread, int state)
handle_signals(struct thread *thread, cpu_status *state)
{
uint32 signalMask = thread->sig_pending & (~thread->sig_block_mask);
int i, sig, global_resched = 0;
struct sigaction *handler;
if (signalMask == 0)
while (signalMask == 0) {
// check, if the thread shall stop for debugging
// ToDo: This isn't quite right yet. We always need to check
// whether the thread has to stop, also, if there is a signal. Since
// in case signal debugging is disabled the thread wouldn't stop
// below. At the moment it doesn't stop either, if the signal is
// ignored.
if (thread->debug_info.flags & B_THREAD_DEBUG_STOP) {
RELEASE_THREAD_LOCK();
restore_interrupts(*state);
user_debug_stop_thread();
*state = disable_interrupts();
GRAB_THREAD_LOCK();
signalMask = thread->sig_pending & (~thread->sig_block_mask);
continue;
}
return 0;
}
for (i = 0; i < NSIG; i++) {
if (signalMask & 0x1) {
bool debugSignal = atomic_get(&thread->team->debug_info.flags)
& B_TEAM_DEBUG_SIGNALS;
sig = i + 1;
handler = &thread->sig_action[i];
signalMask >>= 1;
@ -62,6 +91,7 @@ handle_signals(struct thread *thread, int state)
if (handler->sa_handler == SIG_IGN) {
// signal is to be ignored
// ToDo: apply zombie cleaning on SIGCHLD
// ToDo: Do we need to notify the debugger?
continue;
}
if (handler->sa_handler == SIG_DFL) {
@ -94,7 +124,7 @@ handle_signals(struct thread *thread, int state)
thread->exit.reason = THREAD_RETURN_INTERRUPTED;
RELEASE_THREAD_LOCK();
restore_interrupts(state);
restore_interrupts(*state);
// ToDo: when we have more than a thread per process,
// it can likely happen (for any thread other than the first)
@ -104,10 +134,33 @@ handle_signals(struct thread *thread, int state)
// We absolutely need interrupts enabled when we enter
// thread_exit().
if (debugSignal && sig != SIGKILL
&& sig != SIGKILLTHR) {
// notify the debugger
if (user_debug_handle_signal(sig, true)
== B_THREAD_DEBUG_IGNORE_SIGNAL) {
continue;
}
}
thread_exit();
}
}
if (debugSignal) {
// notify the debugger
RELEASE_THREAD_LOCK();
restore_interrupts(*state);
if (user_debug_handle_signal(sig, false)
== B_THREAD_DEBUG_IGNORE_SIGNAL) {
continue;
}
*state = disable_interrupts();
GRAB_THREAD_LOCK();
}
// ToDo: it's not safe to call arch_setup_signal_frame with
// interrupts disabled since it writes to the user stack
// and may page fault.