gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag

GDB assumes that watchpoint set via the gdbstub remote protocol will
behave in the same way as hardware watchpoints for the target. In
particular, whether the CPU stops with the PC before or after the insn
which triggers the watchpoint is target dependent. Allow guest CPU
code to specify which behaviour to use. This fixes a bug where with
guest CPUs which stop before the accessing insn GDB would manually
step forward over what it thought was the insn and end up one insn
further forward than it should be.

We set this flag for the CPU architectures which set
gdbarch_have_nonsteppable_watchpoint in gdb 7.7:
ARM, CRIS, LM32, MIPS and Xtensa.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Michael Walle <michael@walle.cc> (for lm32)
Message-id: 1410545057-14014-1-git-send-email-peter.maydell@linaro.org

7 files changed, 31 insertions, 9 deletions

diff --git a/gdbstub.c b/gdbstub.c
index 71aaa23..d1b5afd 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -625,11 +625,23 @@ void gdb_register_coprocessor(CPUState *cpu,
 }
 
 #ifndef CONFIG_USER_ONLY
-static const int xlat_gdb_type[] = {
-    [GDB_WATCHPOINT_WRITE]  = BP_GDB | BP_MEM_WRITE,
-    [GDB_WATCHPOINT_READ]   = BP_GDB | BP_MEM_READ,
-    [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
-};
+/* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
+static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
+{
+    static const int xlat[] = {
+        [GDB_WATCHPOINT_WRITE]  = BP_GDB | BP_MEM_WRITE,
+        [GDB_WATCHPOINT_READ]   = BP_GDB | BP_MEM_READ,
+        [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
+    };
+
+    CPUClass *cc = CPU_GET_CLASS(cpu);
+    int cputype = xlat[gdbtype];
+
+    if (cc->gdb_stop_before_watchpoint) {
+        cputype |= BP_STOP_BEFORE_ACCESS;
+    }
+    return cputype;
+}
 #endif
 
 static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
@@ -656,10 +668,11 @@ static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
     case GDB_WATCHPOINT_READ:
     case GDB_WATCHPOINT_ACCESS:
         CPU_FOREACH(cpu) {
-            err = cpu_watchpoint_insert(cpu, addr, len, xlat_gdb_type[type],
-                                        NULL);
-            if (err)
+            err = cpu_watchpoint_insert(cpu, addr, len,
+                                        xlat_gdb_type(cpu, type), NULL);
+            if (err) {
                 break;
+            }
         }
         return err;
 #endif
@@ -692,7 +705,8 @@ static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
     case GDB_WATCHPOINT_READ:
     case GDB_WATCHPOINT_ACCESS:
         CPU_FOREACH(cpu) {
-            err = cpu_watchpoint_remove(cpu, addr, len, xlat_gdb_type[type]);
+            err = cpu_watchpoint_remove(cpu, addr, len,
+                                        xlat_gdb_type(cpu, type));
             if (err)
                 break;
         }
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index f576b47..2098f1c 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -99,6 +99,8 @@ struct TranslationBlock;
  * @vmsd: State description for migration.
  * @gdb_num_core_regs: Number of core registers accessible to GDB.
  * @gdb_core_xml_file: File name for core registers GDB XML description.
+ * @gdb_stop_before_watchpoint: Indicates whether GDB expects the CPU to stop
+ *           before the insn which triggers a watchpoint rather than after it.
  * @cpu_exec_enter: Callback for cpu_exec preparation.
  * @cpu_exec_exit: Callback for cpu_exec cleanup.
  * @cpu_exec_interrupt: Callback for processing interrupts in cpu_exec.
@@ -152,6 +154,7 @@ typedef struct CPUClass {
     const struct VMStateDescription *vmsd;
     int gdb_num_core_regs;
     const char *gdb_core_xml_file;
+    bool gdb_stop_before_watchpoint;
 
     void (*cpu_exec_enter)(CPUState *cpu);
     void (*cpu_exec_exit)(CPUState *cpu);
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 8ab6d95..edfd586 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -1117,6 +1117,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
 #endif
     cc->gdb_num_core_regs = 26;
     cc->gdb_core_xml_file = "arm-core.xml";
+    cc->gdb_stop_before_watchpoint = true;
     cc->debug_excp_handler = arm_debug_excp_handler;
 }
 
diff --git a/target-cris/cpu.c b/target-cris/cpu.c
index 528e458..16cfba9 100644
--- a/target-cris/cpu.c
+++ b/target-cris/cpu.c
@@ -291,6 +291,7 @@ static void cris_cpu_class_init(ObjectClass *oc, void *data)
 #endif
 
     cc->gdb_num_core_regs = 49;
+    cc->gdb_stop_before_watchpoint = true;
 }
 
 static const TypeInfo cris_cpu_type_info = {
diff --git a/target-lm32/cpu.c b/target-lm32/cpu.c
index 6c5de66..f8081f5 100644
--- a/target-lm32/cpu.c
+++ b/target-lm32/cpu.c
@@ -273,6 +273,7 @@ static void lm32_cpu_class_init(ObjectClass *oc, void *data)
     cc->vmsd = &vmstate_lm32_cpu;
 #endif
     cc->gdb_num_core_regs = 32 + 7;
+    cc->gdb_stop_before_watchpoint = true;
     cc->debug_excp_handler = lm32_debug_excp_handler;
 }
 
diff --git a/target-mips/cpu.c b/target-mips/cpu.c
index 5ed60f7..98dc94e 100644
--- a/target-mips/cpu.c
+++ b/target-mips/cpu.c
@@ -151,6 +151,7 @@ static void mips_cpu_class_init(ObjectClass *c, void *data)
 #endif
 
     cc->gdb_num_core_regs = 73;
+    cc->gdb_stop_before_watchpoint = true;
 }
 
 static const TypeInfo mips_cpu_type_info = {
diff --git a/target-xtensa/cpu.c b/target-xtensa/cpu.c
index 51c41d5..6a5414f 100644
--- a/target-xtensa/cpu.c
+++ b/target-xtensa/cpu.c
@@ -147,6 +147,7 @@ static void xtensa_cpu_class_init(ObjectClass *oc, void *data)
     cc->set_pc = xtensa_cpu_set_pc;
     cc->gdb_read_register = xtensa_cpu_gdb_read_register;
     cc->gdb_write_register = xtensa_cpu_gdb_write_register;
+    cc->gdb_stop_before_watchpoint = true;
 #ifndef CONFIG_USER_ONLY
     cc->do_unaligned_access = xtensa_cpu_do_unaligned_access;
     cc->get_phys_page_debug = xtensa_cpu_get_phys_page_debug;