target-i386: Move breakpoint related functions to new file

Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 182 insertions, 0 deletions

diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c
new file mode 100644
index 0000000000..6f6537d58c
--- /dev/null
+++ b/target-i386/bpt_helper.c
@@ -0,0 +1,182 @@
+/*
+ *  i386 breakpoint helpers
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "exec/helper-proto.h"
+
+
+void hw_breakpoint_insert(CPUX86State *env, int index)
+{
+    CPUState *cs = CPU(x86_env_get_cpu(env));
+    int type = 0, err = 0;
+
+    switch (hw_breakpoint_type(env->dr[7], index)) {
+    case DR7_TYPE_BP_INST:
+        if (hw_breakpoint_enabled(env->dr[7], index)) {
+            err = cpu_breakpoint_insert(cs, env->dr[index], BP_CPU,
+                                        &env->cpu_breakpoint[index]);
+        }
+        break;
+    case DR7_TYPE_DATA_WR:
+        type = BP_CPU | BP_MEM_WRITE;
+        break;
+    case DR7_TYPE_IO_RW:
+        /* No support for I/O watchpoints yet */
+        break;
+    case DR7_TYPE_DATA_RW:
+        type = BP_CPU | BP_MEM_ACCESS;
+        break;
+    }
+
+    if (type != 0) {
+        err = cpu_watchpoint_insert(cs, env->dr[index],
+                                    hw_breakpoint_len(env->dr[7], index),
+                                    type, &env->cpu_watchpoint[index]);
+    }
+
+    if (err) {
+        env->cpu_breakpoint[index] = NULL;
+    }
+}
+
+void hw_breakpoint_remove(CPUX86State *env, int index)
+{
+    CPUState *cs;
+
+    if (!env->cpu_breakpoint[index]) {
+        return;
+    }
+    cs = CPU(x86_env_get_cpu(env));
+    switch (hw_breakpoint_type(env->dr[7], index)) {
+    case DR7_TYPE_BP_INST:
+        if (hw_breakpoint_enabled(env->dr[7], index)) {
+            cpu_breakpoint_remove_by_ref(cs, env->cpu_breakpoint[index]);
+        }
+        break;
+    case DR7_TYPE_DATA_WR:
+    case DR7_TYPE_DATA_RW:
+        cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[index]);
+        break;
+    case DR7_TYPE_IO_RW:
+        /* No support for I/O watchpoints yet */
+        break;
+    }
+}
+
+bool check_hw_breakpoints(CPUX86State *env, bool force_dr6_update)
+{
+    target_ulong dr6;
+    int reg;
+    bool hit_enabled = false;
+
+    dr6 = env->dr[6] & ~0xf;
+    for (reg = 0; reg < DR7_MAX_BP; reg++) {
+        bool bp_match = false;
+        bool wp_match = false;
+
+        switch (hw_breakpoint_type(env->dr[7], reg)) {
+        case DR7_TYPE_BP_INST:
+            if (env->dr[reg] == env->eip) {
+                bp_match = true;
+            }
+            break;
+        case DR7_TYPE_DATA_WR:
+        case DR7_TYPE_DATA_RW:
+            if (env->cpu_watchpoint[reg] &&
+                env->cpu_watchpoint[reg]->flags & BP_WATCHPOINT_HIT) {
+                wp_match = true;
+            }
+            break;
+        case DR7_TYPE_IO_RW:
+            break;
+        }
+        if (bp_match || wp_match) {
+            dr6 |= 1 << reg;
+            if (hw_breakpoint_enabled(env->dr[7], reg)) {
+                hit_enabled = true;
+            }
+        }
+    }
+
+    if (hit_enabled || force_dr6_update) {
+        env->dr[6] = dr6;
+    }
+
+    return hit_enabled;
+}
+
+void breakpoint_handler(CPUState *cs)
+{
+    X86CPU *cpu = X86_CPU(cs);
+    CPUX86State *env = &cpu->env;
+    CPUBreakpoint *bp;
+
+    if (cs->watchpoint_hit) {
+        if (cs->watchpoint_hit->flags & BP_CPU) {
+            cs->watchpoint_hit = NULL;
+            if (check_hw_breakpoints(env, false)) {
+                raise_exception(env, EXCP01_DB);
+            } else {
+                cpu_resume_from_signal(cs, NULL);
+            }
+        }
+    } else {
+        QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
+            if (bp->pc == env->eip) {
+                if (bp->flags & BP_CPU) {
+                    check_hw_breakpoints(env, true);
+                    raise_exception(env, EXCP01_DB);
+                }
+                break;
+            }
+        }
+    }
+}
+
+void helper_single_step(CPUX86State *env)
+{
+#ifndef CONFIG_USER_ONLY
+    check_hw_breakpoints(env, true);
+    env->dr[6] |= DR6_BS;
+#endif
+    raise_exception(env, EXCP01_DB);
+}
+
+void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
+{
+#ifndef CONFIG_USER_ONLY
+    int i;
+
+    if (reg < 4) {
+        hw_breakpoint_remove(env, reg);
+        env->dr[reg] = t0;
+        hw_breakpoint_insert(env, reg);
+    } else if (reg == 7) {
+        for (i = 0; i < DR7_MAX_BP; i++) {
+            hw_breakpoint_remove(env, i);
+        }
+        env->dr[7] = t0;
+        for (i = 0; i < DR7_MAX_BP; i++) {
+            hw_breakpoint_insert(env, i);
+        }
+    } else {
+        env->dr[reg] = t0;
+    }
+#endif
+}