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target-i386: Optimize setting dr[0-3]

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If the debug register is not enabled, we need
do nothing besides update the register.

Backports commit 7525b55051277717329cf64a9e1d5cff840d6f38 from qemu
This commit is contained in:
Richard Henderson 2018-02-16 16:11:41 -05:00 committed by Lioncash
parent 805e0ba7b2
commit d1cfcb6d79
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1 changed files with 8 additions and 3 deletions
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11
qemu/target-i386/bpt_helper.c
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@ -227,9 +227,14 @@ 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 {