ARM: opcodes: add opcodes definitions for ARM security extensions

The ARM security extensions introduced the smc instruction, which is not
supported by all versions of GAS.

This patch introduces opcodes-sec.h, so that smc is made available in a
similar manner to hvc.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
ARM: 7511/1: opcodes: Opcode definitions for the Virtualization Extensions

For now, this patch just adds a definition for the HVC instruction.
More can be added here later, as needed.

Now that we have a real example of how to use the opcode injection
macros properly, this patch also adds a cross-reference from the
explanation in opcodes.h (since without an example, figuring out
how to use the macros is not that easy).

Signed-off-by: Dave Martin <dave.martin@linaro.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: opcodes: add __ERET/__MSR_ELR_HYP instruction encoding

Enabling boot from HYP mode requires the use of some more
virt-specific instructions ("eret" and "msr elr_hyp, reg").

Add the necessary encoding to asm/opcode-virt.h.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
ARM: opcodes: add missing include of linux/linkage.h

opcodes.h wants to declare an asmlinkage function, so we need to include
linux/linkage.h

Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>