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Subject[RFC PATCH 09/18] ARM: LPAE: Add fault handling support
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Date
The DFSR and IFSR register format is different when LPAE is enabled. In
addition, DFSR and IFSR have the similar definitions for the fault type.
This modifies modifies the fault code to correctly handle the new
format.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
arch/arm/mm/alignment.c | 8 ++++-
arch/arm/mm/fault.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 87 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c
index 724ba3b..bc98a6e 100644
--- a/arch/arm/mm/alignment.c
+++ b/arch/arm/mm/alignment.c
@@ -906,6 +906,12 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
return 0;
}

+#ifdef CONFIG_ARM_LPAE
+#define ALIGNMENT_FAULT 33
+#else
+#define ALIGNMENT_FAULT 1
+#endif
+
/*
* This needs to be done after sysctl_init, otherwise sys/ will be
* overwritten. Actually, this shouldn't be in sys/ at all since
@@ -939,7 +945,7 @@ static int __init alignment_init(void)
ai_usermode = UM_FIXUP;
}

- hook_fault_code(1, do_alignment, SIGBUS, BUS_ADRALN,
+ hook_fault_code(ALIGNMENT_FAULT, do_alignment, SIGBUS, BUS_ADRALN,
"alignment exception");

/*
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 2966897..b662aea 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -33,10 +33,15 @@
#define FSR_WRITE (1 << 11)
#define FSR_FS4 (1 << 10)
#define FSR_FS3_0 (15)
+#define FSR_FS5_0 (0x3f)

static inline int fsr_fs(unsigned int fsr)
{
+#ifdef CONFIG_ARM_LPAE
+ return fsr & FSR_FS5_0;
+#else
return (fsr & FSR_FS3_0) | (fsr & FSR_FS4) >> 6;
+#endif
}

#ifdef CONFIG_MMU
@@ -108,7 +113,9 @@ void show_pte(struct mm_struct *mm, unsigned long addr)

pte = pte_offset_map(pmd, addr);
printk(", *pte=%08lx", pte_val(*pte));
+#ifndef CONFIG_ARM_LPAE
printk(", *ppte=%08lx", pte_val(pte[-LINUX_PTE_OFFSET]));
+#endif
pte_unmap(pte);
} while(0);

@@ -467,6 +474,72 @@ static struct fsr_info {
int code;
const char *name;
} fsr_info[] = {
+#ifdef CONFIG_ARM_LPAE
+ { do_bad, SIGBUS, 0, "unknown 0" },
+ { do_bad, SIGBUS, 0, "unknown 1" },
+ { do_bad, SIGBUS, 0, "unknown 2" },
+ { do_bad, SIGBUS, 0, "unknown 3" },
+ { do_bad, SIGBUS, 0, "reserved translation fault" },
+ { do_translation_fault, SIGSEGV, SEGV_MAPERR, "level 1 translation fault" },
+ { do_translation_fault, SIGSEGV, SEGV_MAPERR, "level 2 translation fault" },
+ { do_page_fault, SIGSEGV, SEGV_MAPERR, "level 3 translation fault" },
+ { do_bad, SIGBUS, 0, "reserved access flag fault" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 access flag fault" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "level 2 access flag fault" },
+ { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 access flag fault" },
+ { do_bad, SIGBUS, 0, "reserved permission fault" },
+ { do_bad, SIGSEGV, SEGV_ACCERR, "level 1 permission fault" },
+ { do_sect_fault, SIGSEGV, SEGV_ACCERR, "level 2 permission fault" },
+ { do_page_fault, SIGSEGV, SEGV_ACCERR, "level 3 permission fault" },
+ { do_bad, SIGBUS, 0, "synchronous external abort" },
+ { do_bad, SIGBUS, 0, "asynchronous external abort" },
+ { do_bad, SIGBUS, 0, "unknown 18" },
+ { do_bad, SIGBUS, 0, "unknown 19" },
+ { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" },
+ { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" },
+ { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" },
+ { do_bad, SIGBUS, 0, "synchronous abort (translation table walk)" },
+ { do_bad, SIGBUS, 0, "synchronous parity error" },
+ { do_bad, SIGBUS, 0, "asynchronous parity error" },
+ { do_bad, SIGBUS, 0, "unknown 26" },
+ { do_bad, SIGBUS, 0, "unknown 27" },
+ { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk" },
+ { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk" },
+ { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk" },
+ { do_bad, SIGBUS, 0, "synchronous parity error (translation table walk" },
+ { do_bad, SIGBUS, 0, "unknown 32" },
+ { do_bad, SIGILL, BUS_ADRALN, "alignment fault" },
+ { do_bad, SIGBUS, 0, "debug event" },
+ { do_bad, SIGBUS, 0, "unknown 35" },
+ { do_bad, SIGBUS, 0, "unknown 36" },
+ { do_bad, SIGBUS, 0, "unknown 37" },
+ { do_bad, SIGBUS, 0, "unknown 38" },
+ { do_bad, SIGBUS, 0, "unknown 39" },
+ { do_bad, SIGBUS, 0, "unknown 40" },
+ { do_bad, SIGBUS, 0, "unknown 41" },
+ { do_bad, SIGBUS, 0, "unknown 42" },
+ { do_bad, SIGBUS, 0, "unknown 43" },
+ { do_bad, SIGBUS, 0, "unknown 44" },
+ { do_bad, SIGBUS, 0, "unknown 45" },
+ { do_bad, SIGBUS, 0, "unknown 46" },
+ { do_bad, SIGBUS, 0, "unknown 47" },
+ { do_bad, SIGBUS, 0, "unknown 48" },
+ { do_bad, SIGBUS, 0, "unknown 49" },
+ { do_bad, SIGBUS, 0, "unknown 50" },
+ { do_bad, SIGBUS, 0, "unknown 51" },
+ { do_bad, SIGBUS, 0, "implementation fault (lockdown abort)" },
+ { do_bad, SIGBUS, 0, "unknown 53" },
+ { do_bad, SIGBUS, 0, "unknown 54" },
+ { do_bad, SIGBUS, 0, "unknown 55" },
+ { do_bad, SIGBUS, 0, "unknown 56" },
+ { do_bad, SIGBUS, 0, "unknown 57" },
+ { do_bad, SIGBUS, 0, "implementation fault (coprocessor abort)" },
+ { do_bad, SIGBUS, 0, "unknown 59" },
+ { do_bad, SIGBUS, 0, "unknown 60" },
+ { do_bad, SIGBUS, 0, "unknown 61" },
+ { do_bad, SIGBUS, 0, "unknown 62" },
+ { do_bad, SIGBUS, 0, "unknown 63" },
+#else /* !CONFIG_ARM_LPAE */
/*
* The following are the standard ARMv3 and ARMv4 aborts. ARMv5
* defines these to be "precise" aborts.
@@ -508,6 +581,7 @@ static struct fsr_info {
{ do_bad, SIGBUS, 0, "unknown 29" },
{ do_bad, SIGBUS, 0, "unknown 30" },
{ do_bad, SIGBUS, 0, "unknown 31" }
+#endif /* CONFIG_ARM_LPAE */
};

void __init
@@ -546,6 +620,9 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
}


+#ifdef CONFIG_ARM_LPAE
+#define ifsr_info fsr_info
+#else /* !CONFIG_ARM_LPAE */
static struct fsr_info ifsr_info[] = {
{ do_bad, SIGBUS, 0, "unknown 0" },
{ do_bad, SIGBUS, 0, "unknown 1" },
@@ -580,6 +657,7 @@ static struct fsr_info ifsr_info[] = {
{ do_bad, SIGBUS, 0, "unknown 30" },
{ do_bad, SIGBUS, 0, "unknown 31" },
};
+#endif /* CONFIG_ARM_LPAE */

asmlinkage void __exception
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
@@ -602,6 +680,7 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)

static int __init exceptions_init(void)
{
+#ifndef CONFIG_ARM_LPAE
if (cpu_architecture() >= CPU_ARCH_ARMv6) {
hook_fault_code(4, do_translation_fault, SIGSEGV, SEGV_MAPERR,
"I-cache maintenance fault");
@@ -617,6 +696,7 @@ static int __init exceptions_init(void)
hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR,
"section access flag fault");
}
+#endif

return 0;
}


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