[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 4/7] xen/arm: traps: Avoid using BUG_ON() in _show_registers()
Julien Grall writes: > At the moment, _show_registers() is using a BUG_ON() to assert only > userspace will run 32-bit code in a 64-bit domain. > > Such extra precaution is not necessary and could be avoided by only > checking the CPU mode to decide whether show_registers_64() or > show_reigsters_32() should be called. > > This has also the nice advantage to avoid nested if in the code. > > Signed-off-by: Julien Grall <julien.grall@xxxxxxx> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx> > --- > xen/arch/arm/traps.c | 16 +++------------- > 1 file changed, 3 insertions(+), 13 deletions(-) > > diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c > index 54e66a86d0..132686ee0f 100644 > --- a/xen/arch/arm/traps.c > +++ b/xen/arch/arm/traps.c > @@ -914,21 +914,11 @@ static void _show_registers(const struct cpu_user_regs > *regs, > > if ( guest_mode ) > { > - if ( is_32bit_domain(v->domain) ) > + if ( psr_mode_is_32bit(regs) ) > show_registers_32(regs, ctxt, guest_mode, v); > #ifdef CONFIG_ARM_64 > - else if ( is_64bit_domain(v->domain) ) > - { > - if ( psr_mode_is_32bit(regs) ) > - { > - BUG_ON(!usr_mode(regs)); > - show_registers_32(regs, ctxt, guest_mode, v); > - } > - else > - { > - show_registers_64(regs, ctxt, guest_mode, v); > - } > - } > + else > + show_registers_64(regs, ctxt, guest_mode, v); > #endif > } > else -- Volodymyr Babchuk at EPAM _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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