Commit 3b17f136 authored by Roman Zippel's avatar Roman Zippel Committed by Linus Torvalds

m68k: Handle 68040 bus faults

Fix 68040 bus fault handling, so the standard kernel exception handling
can be used for i/o probing.

Contrary to normal access faults there is nothing to fix, but at least
we have to disable writebacks to avoid recursive faults.
Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4933d075
......@@ -468,15 +468,26 @@ static inline void access_error040(struct frame *fp)
* (if do_page_fault didn't fix the mapping,
* the writeback won't do good)
*/
disable_wb:
#ifdef DEBUG
printk(".. disabling wb2\n");
#endif
if (fp->un.fmt7.wb2a == fp->un.fmt7.faddr)
fp->un.fmt7.wb2s &= ~WBV_040;
if (fp->un.fmt7.wb3a == fp->un.fmt7.faddr)
fp->un.fmt7.wb3s &= ~WBV_040;
}
} else if (send_fault_sig(&fp->ptregs) > 0) {
printk("68040 access error, ssw=%x\n", ssw);
trap_c(fp);
} else {
/* In case of a bus error we either kill the process or expect
* the kernel to catch the fault, which then is also responsible
* for cleaning up the mess.
*/
current->thread.signo = SIGBUS;
current->thread.faddr = fp->un.fmt7.faddr;
if (send_fault_sig(&fp->ptregs) >= 0)
printk("68040 bus error (ssw=%x, faddr=%lx)\n", ssw,
fp->un.fmt7.faddr);
goto disable_wb;
}
do_040writebacks(fp);
......
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