tree 4f5e143e0be83f4102e34da512d3727bcaa22be7
parent 0b2effd744471adea1cc82966df8a54fd6afa200
author Jincheng Miao <jmiao@redhat.com> 1407470214 +0800
committer Riku Voipio <riku.voipio@linaro.org> 1408709193 +0300

linux-user: Fix syscall instruction usermode emulation on X86_64

Currently syscall instruction is buggy on user mode X86_64,
the EIP is updated after do_syscall(), that is too late for
clone(). Because clone() will create a thread at the env->EIP
(the address of syscall insn), and then child thread enters
do_syscall() again, that is not expected. Sometimes it is tragic.

User mode syscall insn emulation is not used MSR, so the
action should be same to INT 0x80. INT 0x80 will update EIP in
do_interrupt(), ditto for syscall() for consistency.

Signed-off-by: Jincheng Miao <jmiao@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>