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Message-Id: <e4f6fc59049d7888bca781548559c6358236416f.1253281256.git.kirill@shutemov.name>
Date: Fri, 18 Sep 2009 16:48:04 +0300
From: "Kirill A. Shutemov" <kirill@...temov.name>
To: linux-arm-kernel@...ts.infradead.org,
Russell King <linux@....linux.org.uk>
Cc: linux-kernel@...r.kernel.org,
Bityutskiy Artem <Artem.Bityutskiy@...ia.com>,
Koskinen Aaro <aaro.koskinen@...ia.com>,
"Kirill A. Shutemov" <kirill@...temov.name>
Subject: [PATCH 2/2] ARM: Proper prefetch abort handling
Handle prefetch abort basing on instruction fault status register.
Now we can process permission fault correctly.
Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>
---
arch/arm/mm/fault.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 50 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index c7bbb32..b2574cf 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -479,9 +479,58 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
arm_notify_die("", regs, &info, fsr, 0);
}
+
+static struct fsr_info ifsr_info[] = {
+ { do_bad, SIGBUS, 0, "unknown 0" },
+ { do_bad, SIGBUS, 0, "unknown 1" },
+ { do_bad, SIGBUS, 0, "debug event" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "section access flag fault" },
+ { do_bad, SIGBUS, 0, "unknown 4" },
+ { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "page access flag fault" },
+ { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
+ { do_bad, SIGBUS, 0, "external abort on non-linefetch" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" },
+ { do_bad, SIGBUS, 0, "unknown 10" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" },
+ { do_bad, SIGBUS, 0, "external abort on translation" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "section permission fault" },
+ { do_bad, SIGBUS, 0, "external abort on translation" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "page permission fault" },
+ { do_bad, SIGBUS, 0, "unknown 16" },
+ { do_bad, SIGBUS, 0, "unknown 17" },
+ { do_bad, SIGBUS, 0, "unknown 18" },
+ { do_bad, SIGBUS, 0, "unknown 19" },
+ { do_bad, SIGBUS, 0, "unknown 20" },
+ { do_bad, SIGBUS, 0, "unknown 21" },
+ { do_bad, SIGBUS, 0, "unknown 22" },
+ { do_bad, SIGBUS, 0, "unknown 23" },
+ { do_bad, SIGBUS, 0, "unknown 24" },
+ { do_bad, SIGBUS, 0, "unknown 25" },
+ { do_bad, SIGBUS, 0, "unknown 26" },
+ { do_bad, SIGBUS, 0, "unknown 27" },
+ { do_bad, SIGBUS, 0, "unknown 28" },
+ { do_bad, SIGBUS, 0, "unknown 29" },
+ { do_bad, SIGBUS, 0, "unknown 30" },
+ { do_bad, SIGBUS, 0, "unknown 31" },
+};
+
asmlinkage void __exception
do_PrefetchAbort(unsigned long addr, int ifsr, struct pt_regs *regs)
{
- do_translation_fault(addr, 0, regs);
+ const struct fsr_info *inf = ifsr_info + (ifsr & 15) + ((ifsr & (1 << 10)) >> 6);
+ struct siginfo info;
+
+ if (!inf->fn(addr, ifsr, regs))
+ return;
+
+ printk(KERN_ALERT "Unhandled prefetch fault: %s (0x%03x) at 0x%08lx\n",
+ inf->name, ifsr, addr);
+
+ info.si_signo = inf->sig;
+ info.si_errno = 0;
+ info.si_code = inf->code;
+ info.si_addr = (void __user *)addr;
+ arm_notify_die("", regs, &info, ifsr, 0);
}
--
1.6.4.4
--
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