Patchwork [v3,3/3] target-i386:slightly refactor dr7 related function

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Submitter liguang
Date Dec. 7, 2012, 1:25 a.m.
Message ID <1354843535-10912-3-git-send-email-lig.fnst@cn.fujitsu.com>
Download mbox | patch
Permalink /patch/204370/
State New
Headers show

Comments

liguang - Dec. 7, 2012, 1:25 a.m.
Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
---
 target-i386/helper.c      |   74 +++++++++++++++++++++++++++++---------------
 target-i386/machine.c     |    5 ++-
 target-i386/misc_helper.c |    4 +-
 target-i386/seg_helper.c  |    6 ++--
 4 files changed, 57 insertions(+), 32 deletions(-)
Peter Maydell - Dec. 7, 2012, 10:27 a.m.
On 7 December 2012 01:25, liguang <lig.fnst@cn.fujitsu.com> wrote:
> diff --git a/target-i386/seg_helper.c b/target-i386/seg_helper.c
> index ff93374..16d489a 100644
> --- a/target-i386/seg_helper.c
> +++ b/target-i386/seg_helper.c
> @@ -465,9 +465,9 @@ static void switch_tss(CPUX86State *env, int tss_selector,
>
>  #ifndef CONFIG_USER_ONLY
>      /* reset local breakpoints */
> -    if (env->dr[7] & 0x55) {
> -        for (i = 0; i < 4; i++) {
> -            if (hw_breakpoint_enabled(env->dr[7], i) == 0x1) {
> +    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_breakpoint_remove(env, i);
>              }
>          }

No, this is still wrong. The check we are making here is
"is local bp enabled and global bp disabled?", not "is
local bp enabled?", so at a minimum your function is
badly misnamed.

-- PMM

Patch

diff --git a/target-i386/helper.c b/target-i386/helper.c
index bf206cf..62746c5 100644
--- a/target-i386/helper.c
+++ b/target-i386/helper.c
@@ -966,30 +966,33 @@  hwaddr cpu_get_phys_page_debug(CPUX86State *env, target_ulong addr)
 
 void hw_breakpoint_insert(CPUX86State *env, int index)
 {
-    int type, err = 0;
+    int type = 0, err = 0;
 
     switch (hw_breakpoint_type(env->dr[7], index)) {
-    case 0:
-        if (hw_breakpoint_enabled(env->dr[7], index))
+    case DR7_TYPE_BP_INST:
+        if (hw_breakpoint_enabled(env->dr[7], index)) {
             err = cpu_breakpoint_insert(env, env->dr[index], BP_CPU,
                                         &env->cpu_breakpoint[index]);
+        }
         break;
-    case 1:
+    case DR7_TYPE_DATA_WR:
         type = BP_CPU | BP_MEM_WRITE;
-        goto insert_wp;
-    case 2:
-         /* No support for I/O watchpoints yet */
         break;
-    case 3:
+    case DR7_TYPE_DATA_RW:
         type = BP_CPU | BP_MEM_ACCESS;
-    insert_wp:
+        break;
+	case DR7_TYPE_IO_RW:
+        /* No support for I/O watchpoints yet */
+        break;
+    }
+	if (type) {
         err = cpu_watchpoint_insert(env, env->dr[index],
                                     hw_breakpoint_len(env->dr[7], index),
                                     type, &env->cpu_watchpoint[index]);
-        break;
     }
-    if (err)
+    if (err) {
         env->cpu_breakpoint[index] = NULL;
+    }
 }
 
 void hw_breakpoint_remove(CPUX86State *env, int index)
@@ -997,15 +1000,16 @@  void hw_breakpoint_remove(CPUX86State *env, int index)
     if (!env->cpu_breakpoint[index])
         return;
     switch (hw_breakpoint_type(env->dr[7], index)) {
-    case 0:
-        if (hw_breakpoint_enabled(env->dr[7], index))
+    case DR7_TYPE_BP_INST:
+        if (hw_breakpoint_enabled(env->dr[7], index)) {
             cpu_breakpoint_remove_by_ref(env, env->cpu_breakpoint[index]);
+        }
         break;
-    case 1:
-    case 3:
+    case DR7_TYPE_DATA_RW:
+    case DR7_TYPE_DATA_WR:
         cpu_watchpoint_remove_by_ref(env, env->cpu_watchpoint[index]);
         break;
-    case 2:
+    case DR7_TYPE_IO_RW:
         /* No support for I/O watchpoints yet */
         break;
     }
@@ -1014,22 +1018,42 @@  void hw_breakpoint_remove(CPUX86State *env, int index)
 int check_hw_breakpoints(CPUX86State *env, int force_dr6_update)
 {
     target_ulong dr6;
-    int reg, type;
+    int index;
     int hit_enabled = 0;
+    bool bp_match = false;
+    bool wp_match = false;
 
     dr6 = env->dr[6] & ~0xf;
-    for (reg = 0; reg < 4; reg++) {
-        type = hw_breakpoint_type(env->dr[7], reg);
-        if ((type == 0 && env->dr[reg] == env->eip) ||
-            ((type & 1) && env->cpu_watchpoint[reg] &&
-             (env->cpu_watchpoint[reg]->flags & BP_WATCHPOINT_HIT))) {
-            dr6 |= 1 << reg;
-            if (hw_breakpoint_enabled(env->dr[7], reg))
+	for (index = 0; index < DR7_MAX_BP; index++) {
+        switch (hw_breakpoint_type(env->dr[7], index)) {
+        case DR7_TYPE_BP_INST:
+            if (env->dr[index] == env->eip) {
+                bp_match = true;
+            }
+            break;
+        case DR7_TYPE_DATA_WR:
+        case DR7_TYPE_DATA_RW:
+            if (env->cpu_watchpoint[index] &&
+                env->cpu_watchpoint[index]->flags & BP_WATCHPOINT_HIT) {
+                wp_match = true;
+            }
+			break;
+        case DR7_TYPE_IO_RW:
+            break;
+        }
+        if (bp_match || wp_match) {
+            dr6 |= 1 << index;
+            if (hw_breakpoint_enabled(env->dr[7], index)) {
                 hit_enabled = 1;
+            }
+            bp_match = false;
+            wp_match = false;
         }
     }
-    if (hit_enabled || force_dr6_update)
+    if (hit_enabled || force_dr6_update) {
         env->dr[6] = dr6;
+	}
+
     return hit_enabled;
 }
 
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 4771508..67131a4 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -265,10 +265,11 @@  static int cpu_post_load(void *opaque, int version_id)
 
     cpu_breakpoint_remove_all(env, BP_CPU);
     cpu_watchpoint_remove_all(env, BP_CPU);
-    for (i = 0; i < 4; i++)
+    for (i = 0; i < DR7_MAX_BP; i++) {
         hw_breakpoint_insert(env, i);
-
+	}
     tlb_flush(env, 1);
+
     return 0;
 }
 
diff --git a/target-i386/misc_helper.c b/target-i386/misc_helper.c
index a020379..5ee0863 100644
--- a/target-i386/misc_helper.c
+++ b/target-i386/misc_helper.c
@@ -197,11 +197,11 @@  void helper_movl_drN_T0(CPUX86State *env, int reg, target_ulong t0)
         env->dr[reg] = t0;
         hw_breakpoint_insert(env, reg);
     } else if (reg == 7) {
-        for (i = 0; i < 4; i++) {
+        for (i = 0; i < DR7_MAX_BP; i++) {
             hw_breakpoint_remove(env, i);
         }
         env->dr[7] = t0;
-        for (i = 0; i < 4; i++) {
+        for (i = 0; i < DR7_MAX_BP; i++) {
             hw_breakpoint_insert(env, i);
         }
     } else {
diff --git a/target-i386/seg_helper.c b/target-i386/seg_helper.c
index ff93374..16d489a 100644
--- a/target-i386/seg_helper.c
+++ b/target-i386/seg_helper.c
@@ -465,9 +465,9 @@  static void switch_tss(CPUX86State *env, int tss_selector,
 
 #ifndef CONFIG_USER_ONLY
     /* reset local breakpoints */
-    if (env->dr[7] & 0x55) {
-        for (i = 0; i < 4; i++) {
-            if (hw_breakpoint_enabled(env->dr[7], i) == 0x1) {
+    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_breakpoint_remove(env, i);
             }
         }