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avr32: Fix lockup after Java stack underflow in user mode

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When using the Java Extension Module hardware, a Java stack underflow or
overflow trap may cause the system to enter an infinite exception loop.
Although there's no kernel support for the Java hardware yet, we need to
be able to recover from this situation and keep the system running.

This patch adds code to detect and fixup this situation in the critical
exception handler and terminate the faulting process. We may have to
rethink how to handle this more gracefully when the necessary kernel
support for hardware-accelerated Java is added.

Reported-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen
2008-08-20 15:46:24 +02:00
parent bef69ea0dc
commit 9e3f544d79
2 changed files with 63 additions and 2 deletions
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6
arch/avr32/kernel/asm-offsets.c
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@@ -4,6 +4,8 @@
* to extract and format the required data.
*/
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/thread_info.h>
#include <linux/kbuild.h>
@@ -17,4 +19,8 @@ void foo(void)
OFFSET(TI_rar_saved, thread_info, rar_saved);
OFFSET(TI_rsr_saved, thread_info, rsr_saved);
OFFSET(TI_restart_block, thread_info, restart_block);
BLANK();
OFFSET(TSK_active_mm, task_struct, active_mm);
BLANK();
OFFSET(MM_pgd, mm_struct, pgd);
}