From b0ee68ca981d9fe1f5e9fe7c1476921d8f8bdaf7 Mon Sep 17 00:00:00 2001 From: Ian Campbell Date: Fri, 18 Jul 2014 14:13:14 +0100 Subject: [PATCH 1/3] xen: arm: handle AArch32 userspace when dumping 64-bit guest state. A 64-bit guest can still be in 32-bit mode when running userspace, handle this case by dumping the correct 32-bit state. Note that on ARM it is not possible to change mode without the help of the next exception level, hence there is no way a 64-bit guest can be running in 32-bit kernel modes. This is part of XSA-102. Signed-off-by: Ian Campbell Acked-by: Julien Grall --- xen/arch/arm/traps.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 3dfabd0..e104509 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -697,7 +697,17 @@ static void _show_registers(struct cpu_user_regs *regs, show_registers_32(regs, ctxt, guest_mode, v); #ifdef CONFIG_ARM_64 else if ( is_64bit_domain(v->domain) ) - show_registers_64(regs, ctxt, guest_mode, v); + { + if ( psr_mode_is_32bit(regs->cpsr) ) + { + BUG_ON(!usr_mode(regs)); + show_registers_32(regs, ctxt, guest_mode, v); + } + else + { + show_registers_64(regs, ctxt, guest_mode, v); + } + } #endif } else -- 1.7.10.4