diff options
| author | Roman Zippel <zippel@linux-m68k.org> | 2008-05-05 21:25:48 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-05-05 12:38:50 -0700 |
| commit | 3b17f136bf32984eb0faeb116bcd44ffe3503782 (patch) | |
| tree | 18ea61dbb8b6ecda01be18e2b1c56803ae6544a6 | |
| parent | 4933d07531711e399d8d578036aa9fc1be2f9b20 (diff) | |
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: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/m68k/kernel/traps.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c index fd4858e2dd6..75b8340b254 100644 --- a/arch/m68k/kernel/traps.c +++ b/arch/m68k/kernel/traps.c @@ -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); |