lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[POWERPC] Never panic when taking altivec exceptions from userspace

Browse Source 
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 <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Blanchard
2006-10-13 11:41:00 +10:00
committed by Paul Mackerras
parent 60b2a46cd6
commit 6c4841c2b6
1 changed files with 1 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/kernel/traps.c
View File

@@ -900,14 +900,13 @@ void kernel_fp_unavailable_exception(struct pt_regs *regs)
void altivec_unavailable_exception(struct pt_regs *regs) void altivec_unavailable_exception(struct pt_regs *regs)
{ {
#if !defined(CONFIG_ALTIVEC)
if (user_mode(regs)) { if (user_mode(regs)) {
/* A user program has executed an altivec instruction, /* A user program has executed an altivec instruction,
but this kernel doesn't support altivec. */ but this kernel doesn't support altivec. */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip); _exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return; return;
} }
#endif
printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception " printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "
"%lx at %lx\n", regs->trap, regs->nip); "%lx at %lx\n", regs->trap, regs->nip);
die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT); die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);