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signals: handle SIGBUS, SIGSEGV, SIGILL etc

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Matheus
2024-05-29 11:06:15 -03:00
parent d689766a44
commit c81bdac897
4 changed files with 33 additions and 4 deletions
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kernel-src/sys/signal.c
+3 -1
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@@ -325,6 +325,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
goto leave;
}
// if not, just sleep. the sigcont won't be sent until THREAD_LEAVE and preparesleep is protecting it from a lost wakeup
context_t savecontext = *context; // save context as it could be overwritten if, for example, its the thread->context one
sched_preparesleep(false);
thread->signals.stopped = true;
THREAD_LEAVE(thread);
@@ -334,6 +335,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
// make sure a SIGCONT happened
__assert(SIGNAL_GET(&thread->signals.pending, SIGCONT));
__assert(thread->signals.stopped == false);
*context = savecontext; // restore saved context
// the stopped variable is already set by the signaling function
// see if theres any other signal to deal with (such as the SIGCONT handler)
return true;
@@ -352,7 +354,7 @@ bool signal_check(struct thread_t *thread, context_t *context, bool syscall, uin
// get where in memory to put the frame
void *stack = altstack ? altstack : (void *)CTX_SP(context);
#if ARCH_SIGNAL_STACK_GROWS_DOWNWARDS == 1
stack = (void *)(((uintptr_t)stack - ARCH_SIGNAL_REDZONE_SIZE - sizeof(sigframe_t)) & ~0xf);
stack = (void *)(((uintptr_t)stack - ARCH_SIGNAL_REDZONE_SIZE - sizeof(sigframe_t)) & ~0xfl);
#else
#error unsupported
#endif