From 7525b55051277717329cf64a9e1d5cff840d6f38 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Tue, 15 Sep 2015 11:45:11 -0700 Subject: 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 Signed-off-by: Eduardo Habkost --- target-i386/bpt_helper.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c index ca58ab7..7ff41a6 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 { -- cgit v1.1