diff options
| author | Doug Evans <dje@google.com> | 2016-12-06 23:06:30 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-12-22 16:01:04 +0100 |
| commit | c52ab08aee6f7d4717fc6b517174043126bd302f (patch) | |
| tree | 59715b2881805e60a3e12b49083c08faba7efaff /target/i386/bpt_helper.c | |
| parent | 6053a86fe7bd3d5b07b49dae6c05f2cd0d44e687 (diff) | |
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.
Signed-off-by: Doug Evans <dje@google.com>
Message-Id: <94eb2c0bfa1c6a9fec0543057483@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target/i386/bpt_helper.c')
| -rw-r--r-- | target/i386/bpt_helper.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/target/i386/bpt_helper.c b/target/i386/bpt_helper.c index 6fd7fe04a0..b3efdc77ec 100644 --- a/target/i386/bpt_helper.c +++ b/target/i386/bpt_helper.c @@ -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 |