[Qemu-devel] [PULL 03/13] target-i386: Introduce cpu_x86_update_dr7

[Eduardo Habkost <ehabkost@redhat.com>]

From: Richard Henderson <rth@twiddle.net>

This moves the last of the iteration over breakpoints into
the bpt_helper.c file.  This also allows us to make several
breakpoint functions static.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 target-i386/bpt_helper.c | 29 ++++++++++++++++++-----------
 target-i386/cpu.h        |  4 ++--
 target-i386/machine.c    |  8 ++++++--
 target-i386/seg_helper.c |  8 +-------
 4 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/target-i386/bpt_helper.c b/target-i386/bpt_helper.c
index c071c24..f14788a 100644
--- a/target-i386/bpt_helper.c
+++ b/target-i386/bpt_helper.c
@@ -21,7 +21,8 @@
 #include "exec/helper-proto.h"
 
 
-void hw_breakpoint_insert(CPUX86State *env, int index)
+#ifndef CONFIG_USER_ONLY
+static void hw_breakpoint_insert(CPUX86State *env, int index)
 {
     CPUState *cs = CPU(x86_env_get_cpu(env));
     int type = 0, err = 0;
@@ -55,7 +56,7 @@ void hw_breakpoint_insert(CPUX86State *env, int index)
     }
 }
 
-void hw_breakpoint_remove(CPUX86State *env, int index)
+static void hw_breakpoint_remove(CPUX86State *env, int index)
 {
     CPUState *cs;
 
@@ -79,6 +80,20 @@ void hw_breakpoint_remove(CPUX86State *env, int index)
     }
 }
 
+void cpu_x86_update_dr7(CPUX86State *env, uint32_t new_dr7)
+{
+    int i;
+
+    for (i = 0; i < DR7_MAX_BP; i++) {
+        hw_breakpoint_remove(env, i);
+    }
+    env->dr[7] = new_dr7;
+    for (i = 0; i < DR7_MAX_BP; i++) {
+        hw_breakpoint_insert(env, i);
+    }
+}
+#endif
+
 static bool check_hw_breakpoints(CPUX86State *env, bool force_dr6_update)
 {
     target_ulong dr6;
@@ -161,20 +176,12 @@ void helper_single_step(CPUX86State *env)
 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);
-        }
+        cpu_x86_update_dr7(env, t0);
     } else {
         env->dr[reg] = t0;
     }
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index a395b4b..70d1b21 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -235,6 +235,7 @@
 #define DR7_TYPE_SHIFT  16
 #define DR7_LEN_SHIFT   18
 #define DR7_FIXED_1     0x00000400
+#define DR7_GLOBAL_BP_MASK   0xaa
 #define DR7_LOCAL_BP_MASK    0x55
 #define DR7_MAX_BP           4
 #define DR7_TYPE_BP_INST     0x0
@@ -1154,14 +1155,13 @@ static inline int hw_breakpoint_len(unsigned long dr7, int index)
     return (len == 2) ? 8 : len + 1;
 }
 
-void hw_breakpoint_insert(CPUX86State *env, int index);
-void hw_breakpoint_remove(CPUX86State *env, int index);
 void breakpoint_handler(CPUState *cs);
 
 /* will be suppressed */
 void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0);
 void cpu_x86_update_cr3(CPUX86State *env, target_ulong new_cr3);
 void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4);
+void cpu_x86_update_dr7(CPUX86State *env, uint32_t new_dr7);
 
 /* hw/pc.c */
 uint64_t cpu_get_tsc(CPUX86State *env);
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 6737366..a18e16e 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -367,8 +367,12 @@ static int cpu_post_load(void *opaque, int version_id)
 
     cpu_breakpoint_remove_all(cs, BP_CPU);
     cpu_watchpoint_remove_all(cs, BP_CPU);
-    for (i = 0; i < DR7_MAX_BP; i++) {
-        hw_breakpoint_insert(env, i);
+    {
+        /* Indicate all breakpoints disabled, as they are, then
+           let the helper re-enable them.  */
+        target_ulong dr7 = env->dr[7];
+        env->dr[7] = dr7 & ~(DR7_GLOBAL_BP_MASK | DR7_LOCAL_BP_MASK);
+        cpu_x86_update_dr7(env, dr7);
     }
     tlb_flush(cs, 1);
 
diff --git a/target-i386/seg_helper.c b/target-i386/seg_helper.c
index 1cbe559..20ee892 100644
--- a/target-i386/seg_helper.c
+++ b/target-i386/seg_helper.c
@@ -501,13 +501,7 @@ static void switch_tss_ra(CPUX86State *env, int tss_selector,
 #ifndef CONFIG_USER_ONLY
     /* reset local breakpoints */
     if (env->dr[7] & DR7_LOCAL_BP_MASK) {
-        for (i = 0; i < DR7_MAX_BP; i++) {
-            if (hw_local_breakpoint_enabled(env->dr[7], i) &&
-                !hw_global_breakpoint_enabled(env->dr[7], i)) {
-                hw_breakpoint_remove(env, i);
-            }
-        }
-        env->dr[7] &= ~DR7_LOCAL_BP_MASK;
+        cpu_x86_update_dr7(env, env->dr[7] & ~DR7_LOCAL_BP_MASK);
     }
 #endif
 }
-- 
2.1.0