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$NetBSD: patch-target-i386_bpt__helper.c,v 1.1 2017/03/04 15:11:11 spz Exp $
from upstream:
commit c52ab08aee6f7d4717fc6b517174043126bd302f
Author: Doug Evans <dje@google.com>
Date: Tue Dec 6 23:06:30 2016 +0000
target-i386: Fix eflags.TF/#DB handling of syscall/sysret insns
The syscall and sysret instructions behave a bit differently:
TF is checked after the instruction completes.
This allows the o/s to disable #DB at a syscall by adding TF to FMASK.
And then when the sysret is executed the #DB is taken "as if" the
syscall insn just completed.
--- target-i386/bpt_helper.c.orig 2016-12-20 20:16:49.000000000 +0000
+++ target-i386/bpt_helper.c 2017-03-03 04:30:46.000000000 +0000
@@ -244,6 +244,13 @@ void helper_single_step(CPUX86State *env
raise_exception(env, EXCP01_DB);
}
+void helper_rechecking_single_step(CPUX86State *env)
+{
+ if ((env->eflags & TF_MASK) != 0) {
+ helper_single_step(env);
+ }
+}
+
void helper_set_dr(CPUX86State *env, int reg, target_ulong t0)
{
#ifndef CONFIG_USER_ONLY
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