| From | Kamal Mostafa <> | Subject | [PATCH 3.19.y-ckt 068/164] arm64: Fix compat register mappings | Date | Wed, 2 Dec 2015 08:58:39 -0800 |
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3.19.8-ckt11 -stable review patch. If anyone has any objections, please let me know.
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From: Robin Murphy <robin.murphy@arm.com>
commit 5accd17d0eb523350c9ef754d655e379c9bb93b3 upstream.
For reasons not entirely apparent, but now enshrined in history, the architectural mapping of AArch32 banked registers to AArch64 registers actually orders SP_<mode> and LR_<mode> backwards compared to the intuitive r13/r14 order, for all modes except FIQ.
Fix the compat_<reg>_<mode> macros accordingly, in the hope of avoiding subtle bugs with KVM and AArch32 guests.
Signed-off-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- arch/arm64/include/asm/ptrace.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h index 41ed9e1..88d6e24 100644 --- a/arch/arm64/include/asm/ptrace.h +++ b/arch/arm64/include/asm/ptrace.h @@ -76,14 +76,14 @@ #define compat_sp regs[13] #define compat_lr regs[14] #define compat_sp_hyp regs[15] -#define compat_sp_irq regs[16] -#define compat_lr_irq regs[17] -#define compat_sp_svc regs[18] -#define compat_lr_svc regs[19] -#define compat_sp_abt regs[20] -#define compat_lr_abt regs[21] -#define compat_sp_und regs[22] -#define compat_lr_und regs[23] +#define compat_lr_irq regs[16] +#define compat_sp_irq regs[17] +#define compat_lr_svc regs[18] +#define compat_sp_svc regs[19] +#define compat_lr_abt regs[20] +#define compat_sp_abt regs[21] +#define compat_lr_und regs[22] +#define compat_sp_und regs[23] #define compat_r8_fiq regs[24] #define compat_r9_fiq regs[25] #define compat_r10_fiq regs[26] -- 1.9.1
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