diff options
Diffstat (limited to 'arch/arm/kernel/entry-header.S')
| -rw-r--r-- | arch/arm/kernel/entry-header.S | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S index d93f976fb389..ae9464900168 100644 --- a/arch/arm/kernel/entry-header.S +++ b/arch/arm/kernel/entry-header.S @@ -165,6 +165,25 @@ .endm #endif /* !CONFIG_THUMB2_KERNEL */ + @ + @ Debug exceptions are taken as prefetch or data aborts. + @ We must disable preemption during the handler so that + @ we can access the debug registers safely. + @ + .macro debug_entry, fsr +#if defined(CONFIG_HAVE_HW_BREAKPOINT) && defined(CONFIG_PREEMPT) + ldr r4, =0x40f @ mask out fsr.fs + and r5, r4, \fsr + cmp r5, #2 @ debug exception + bne 1f + get_thread_info r10 + ldr r6, [r10, #TI_PREEMPT] @ get preempt count + add r11, r6, #1 @ increment it + str r11, [r10, #TI_PREEMPT] +1: +#endif + .endm + /* * These are the registers used in the syscall handler, and allow us to * have in theory up to 7 arguments to a function - r0 to r6. |