cpu: move debug_check_watchpoint to tcg_ops

commit 568496c0c0f1 ("cpu: Add callback to check architectural") and
commit 3826121d9298 ("target-arm: Implement checking of fired")
introduced an ARM-specific hack for cpu_check_watchpoint.

Make debug_check_watchpoint optional, and move it to tcg_ops.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210204163931.7358-15-cfontana@suse.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

5 files changed, 12 insertions, 17 deletions

diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 5509dd5..9e6e188 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -187,7 +187,8 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
     clear_helper_retaddr();
 
     cc = CPU_GET_CLASS(cpu);
-    cc->tcg_ops.tlb_fill(cpu, address, 0, access_type, MMU_USER_IDX, false, pc);
+    cc->tcg_ops.tlb_fill(cpu, address, 0, access_type,
+                         MMU_USER_IDX, false, pc);
     g_assert_not_reached();
 }
 
diff --git a/hw/core/cpu.c b/hw/core/cpu.c
index 3d5bf9f..00330ba 100644
--- a/hw/core/cpu.c
+++ b/hw/core/cpu.c
@@ -186,14 +186,6 @@ static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
     return 0;
 }
 
-static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
-{
-    /* If no extra check is required, QEMU watchpoint match can be considered
-     * as an architectural match.
-     */
-    return true;
-}
-
 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 {
     return target_words_bigendian();
@@ -415,7 +407,6 @@ static void cpu_class_init(ObjectClass *klass, void *data)
     k->gdb_read_register = cpu_common_gdb_read_register;
     k->gdb_write_register = cpu_common_gdb_write_register;
     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
-    k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
     dc->realize = cpu_common_realizefn;
     dc->unrealize = cpu_common_unrealizefn;
diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index 832dd26..e76a497 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -141,6 +141,12 @@ typedef struct TcgCpuOperations {
      */
     vaddr (*adjust_watchpoint_address)(CPUState *cpu, vaddr addr, int len);
 
+    /**
+     * @debug_check_watchpoint: return true if the architectural
+     * watchpoint whose address has matched should really fire, used by ARM
+     */
+    bool (*debug_check_watchpoint)(CPUState *cpu, CPUWatchpoint *wp);
+
 } TcgCpuOperations;
 
 /**
@@ -177,8 +183,6 @@ typedef struct TcgCpuOperations {
  *       a memory access with the specified memory transaction attributes.
  * @gdb_read_register: Callback for letting GDB read a register.
  * @gdb_write_register: Callback for letting GDB write a register.
- * @debug_check_watchpoint: Callback: return true if the architectural
- *       watchpoint whose address has matched should really fire.
  * @write_elf64_note: Callback for writing a CPU-specific ELF note to a
  * 64-bit VM coredump.
  * @write_elf32_qemunote: Callback for writing a CPU- and QEMU-specific ELF
@@ -232,7 +236,6 @@ struct CPUClass {
     int (*asidx_from_attrs)(CPUState *cpu, MemTxAttrs attrs);
     int (*gdb_read_register)(CPUState *cpu, GByteArray *buf, int reg);
     int (*gdb_write_register)(CPUState *cpu, uint8_t *buf, int reg);
-    bool (*debug_check_watchpoint)(CPUState *cpu, CPUWatchpoint *wp);
 
     int (*write_elf64_note)(WriteCoreDumpFunction f, CPUState *cpu,
                             int cpuid, void *opaque);
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 3d9a9c3..9e64cf7 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -917,8 +917,8 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
             wp->hitaddr = MAX(addr, wp->vaddr);
             wp->hitattrs = attrs;
             if (!cpu->watchpoint_hit) {
-                if (wp->flags & BP_CPU &&
-                    !cc->debug_check_watchpoint(cpu, wp)) {
+                if (wp->flags & BP_CPU && cc->tcg_ops.debug_check_watchpoint &&
+                    !cc->tcg_ops.debug_check_watchpoint(cpu, wp)) {
                     wp->flags &= ~BP_WATCHPOINT_HIT;
                     continue;
                 }
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index 2a14431..c9a66d3 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -2280,12 +2280,12 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
     cc->tcg_ops.synchronize_from_tb = arm_cpu_synchronize_from_tb;
     cc->tcg_ops.tlb_fill = arm_cpu_tlb_fill;
     cc->tcg_ops.debug_excp_handler = arm_debug_excp_handler;
-    cc->debug_check_watchpoint = arm_debug_check_watchpoint;
 #if !defined(CONFIG_USER_ONLY)
+    cc->tcg_ops.do_interrupt = arm_cpu_do_interrupt;
     cc->tcg_ops.do_transaction_failed = arm_cpu_do_transaction_failed;
     cc->tcg_ops.do_unaligned_access = arm_cpu_do_unaligned_access;
     cc->tcg_ops.adjust_watchpoint_address = arm_adjust_watchpoint_address;
-    cc->tcg_ops.do_interrupt = arm_cpu_do_interrupt;
+    cc->tcg_ops.debug_check_watchpoint = arm_debug_check_watchpoint;
 #endif /* CONFIG_TCG && !CONFIG_USER_ONLY */
 #endif /* CONFIG_TCG */
 }