x86/insn-eval: Compute linear address in several utility functions

Computing a linear address involves several steps. The first step is to
compute the effective address. This requires determining the addressing
mode in use and perform arithmetic operations on the operands. Plus, each
addressing mode has special cases that must be handled.

Once the effective address is known, the base address of the applicable
segment is added to obtain the linear address.

Clearly, this is too much work for a single function. Instead, handle each
addressing mode in a separate utility function. This improves readability
and gives us the opportunity to handler errors better.

At the moment, arithmetic to compute the effective address uses 64-byte
variables. Thus, limit support to 64-bit addresses.

While reworking the function insn_get_addr_ref(), the variable addr_offset
is renamed as regoff to reflect its actual use (i.e., offset, from the
base of pt_regs, of the register used as operand).

Suggested-by: Borislav Petkov <[email protected]>
Signed-off-by: Ricardo Neri <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Cc: Adam Buchbinder <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Chen Yucong <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Huang Rui <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Lorenzo Stoakes <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Qiaowei Ren <[email protected]>
Cc: Ravi V. Shankar <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Thomas Garnier <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/1509935277-22138-2-git-send-email-ricardo.neri-calderon@linux.intel.com
Signed-off-by: Ingo Molnar <[email protected]>

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