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target/i386: Clear RF on SYSCALL instruction

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Fix the SYSCALL instruction in 64-bit (long mode). The RF flag
should be cleared in R11 as well as in the RFLAGS. Intel
and AMD CPUs behave same. AMD has this documented in the
APM vol 3.

Backports commit 1a1435dd61e28c1e3b70971107d72a7d05b28d03 from qemu
This commit is contained in:
Rudolf Marek 2018-11-11 08:41:02 -05:00 committed by Lioncash
parent 38a286ee9b
commit fd56d45e19
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 2 deletions
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4
qemu/target/i386/seg_helper.c
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@ -990,11 +990,11 @@ void helper_syscall(CPUX86State *env, int next_eip_addend)
int code64;
env->regs[R_ECX] = env->eip + next_eip_addend;
env->regs[11] = cpu_compute_eflags(env);
env->regs[11] = cpu_compute_eflags(env) & ~RF_MASK;
code64 = env->hflags & HF_CS64_MASK;
env->eflags &= ~env->fmask;
env->eflags &= ~(env->fmask | RF_MASK);
cpu_load_eflags(env, env->eflags, 0);
cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
0, 0xffffffff,