[PATCH] Never panic when taking altivec exceptions from userspace
From: Anton Blanchard <hidden>
Date: 2006-10-13 01:41:00
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
At the moment we rely on a cpu feature bit or a firmware property to detect altivec. If we dont have either of these and the cpu does in fact support altivec we can cause a panic from userspace. It seems safer to always send a signal if we manage to get an 0xf20 exception from userspace. Signed-off-by: Anton Blanchard <redacted> ---
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index d9f10f2..5ed4c2c 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c@@ -900,14 +900,13 @@ void kernel_fp_unavailable_exception(str void altivec_unavailable_exception(struct pt_regs *regs) { -#if !defined(CONFIG_ALTIVEC) if (user_mode(regs)) { /* A user program has executed an altivec instruction, but this kernel doesn't support altivec. */ _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); return; } -#endif + printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " "%lx at %lx\n", regs->trap, regs->nip); die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);