From b8ab5397bcbd92e3fd4a9770e0bf59315fa38dab Mon Sep 17 00:00:00 2001 From: Kirill A. Shutemov Date: Mon, 26 Jul 2010 11:20:41 +0100 Subject: ARM: 6268/1: ARMv6K and ARMv7 use fault statuses 3 and 6 as Access Flag fault Statuses 3 (0b00011) and 6 (0x00110) of DFSR are Access Flags faults on ARMv6K and ARMv7. Let's patch fsr_info[] at runtime if we are on ARMv7 or later. Unfortunately, we don't have runtime check for 'K' extension, so we can't check for it. Signed-off-by: Kirill A. Shutemov Signed-off-by: Russell King --- arch/arm/mm/alignment.c | 14 ++++++++++++-- arch/arm/mm/fault.c | 11 +++++++++++ 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c index 77cfdbed9501..d073b64ae87e 100644 --- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -926,8 +926,18 @@ static int __init alignment_init(void) hook_fault_code(1, do_alignment, SIGBUS, BUS_ADRALN, "alignment exception"); - hook_fault_code(3, do_alignment, SIGBUS, BUS_ADRALN, - "alignment exception"); + + /* + * ARMv6K and ARMv7 use fault status 3 (0b00011) as Access Flag section + * fault, not as alignment error. + * + * TODO: handle ARMv6K properly. Runtime check for 'K' extension is + * needed. + */ + if (cpu_architecture() <= CPU_ARCH_ARMv6) { + hook_fault_code(3, do_alignment, SIGBUS, BUS_ADRALN, + "alignment exception"); + } return 0; } diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 5835e63454ff..23b0b03af5ea 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -607,6 +607,17 @@ static int __init exceptions_init(void) "I-cache maintenance fault"); } + if (cpu_architecture() >= CPU_ARCH_ARMv7) { + /* + * TODO: Access flag faults introduced in ARMv6K. + * Runtime check for 'K' extension is needed + */ + hook_fault_code(3, do_bad, SIGSEGV, SEGV_MAPERR, + "section access flag fault"); + hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR, + "section access flag fault"); + } + return 0; } -- cgit v1.2.3