diff options
| author | Richard Henderson <rth@twiddle.net> | 2015-09-15 11:45:11 -0700 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2015-10-23 12:59:27 -0200 |
| commit | 7525b55051277717329cf64a9e1d5cff840d6f38 (patch) | |
| tree | 26196a6e11cec81cdd6cf603d02e45e2ac8febcf /target-i386/bpt_helper.c | |
| parent | 696ad9e4b27a49a9706010d00b31b17fe1f0d569 (diff) | |
target-i386: Optimize setting dr[0-3]
If the debug register is not enabled, we need
do nothing besides update the register.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'target-i386/bpt_helper.c')
| -rw-r--r-- | target-i386/bpt_helper.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c index ca58ab78c7..7ff41a6c97 100644 --- a/target-i386/bpt_helper.c +++ b/target-i386/bpt_helper.c @@ -228,9 +228,14 @@ void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0) { #ifndef CONFIG_USER_ONLY if (reg < 4) { - hw_breakpoint_remove(env, reg); - env->dr[reg] = t0; - hw_breakpoint_insert(env, reg); + if (hw_breakpoint_enabled(env->dr[7], reg) + && hw_breakpoint_type(env->dr[7], reg) != DR7_TYPE_IO_RW) { + hw_breakpoint_remove(env, reg); + env->dr[reg] = t0; + hw_breakpoint_insert(env, reg); + } else { + env->dr[reg] = t0; + } } else if (reg == 7) { cpu_x86_update_dr7(env, t0); } else { |