kernel: send user interrupt on page fault

I really should just rename interrupts to something else.

This is inspired by Plan9 and meant to make debugging easier, as the
dying process can take a stacktrace etc.

It kinda sucks that the default handler now depends on fprintf, which is quite
a bit of code, but whatever.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/cmd/crash.c b/src/cmd/crash.c
new file mode 100644
index 0000000..a644eed
--- /dev/null
+++ b/src/cmd/crash.c
@@ -0,0 +1,7 @@
+int
+main(void)
+{
+	// TODO flags to write into kernel mem / nonexistent mem, read/write
+	volatile int *thing = (void*)0xF000BAAA;
+	*thing = 1337;
+}