target/avr: Implement gdb_adjust_breakpoint

Ensure at registration that all breakpoints are in
code space, not data space.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/avr/cpu.c

@@ -223,6 +223,7 @@ static void avr_cpu_class_init(ObjectClass *oc, void *data)
     cc->disas_set_info = avr_cpu_disas_set_info;
     cc->gdb_read_register = avr_cpu_gdb_read_register;
     cc->gdb_write_register = avr_cpu_gdb_write_register;
+    cc->gdb_adjust_breakpoint = avr_cpu_gdb_adjust_breakpoint;
     cc->gdb_num_core_regs = 35;
     cc->gdb_core_xml_file = "avr-cpu.xml";
     cc->tcg_ops = &avr_tcg_ops;

target/avr/cpu.h

@@ -162,6 +162,7 @@ hwaddr avr_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
 int avr_cpu_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg);
 int avr_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 int avr_print_insn(bfd_vma addr, disassemble_info *info);
+vaddr avr_cpu_gdb_adjust_breakpoint(CPUState *cpu, vaddr addr);
 
 static inline int avr_feature(CPUAVRState *env, AVRFeature feature)
 {

target/avr/gdbstub.c

@@ -82,3 +82,16 @@ int avr_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
 
     return 0;
 }
+
+vaddr avr_cpu_gdb_adjust_breakpoint(CPUState *cpu, vaddr addr)
+{
+    /*
+     * This is due to some strange GDB behavior
+     * Let's assume main has address 0x100:
+     * b main   - sets breakpoint at address 0x00000100 (code)
+     * b *0x100 - sets breakpoint at address 0x00800100 (data)
+     *
+     * Force all breakpoints into code space.
+     */
+    return addr % OFFSET_DATA;
+}

target/avr/translate.c

@@ -2958,20 +2958,6 @@ static void avr_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
     DisasContext *ctx = container_of(dcbase, DisasContext, base);
     TCGLabel *skip_label = NULL;
 
-    /*
-     * This is due to some strange GDB behavior
-     * Let's assume main has address 0x100:
-     * b main   - sets breakpoint at address 0x00000100 (code)
-     * b *0x100 - sets breakpoint at address 0x00800100 (data)
-     *
-     * The translator driver has already taken care of the code pointer.
-     */
-    if (!ctx->base.singlestep_enabled &&
-        cpu_breakpoint_test(cs, OFFSET_DATA + ctx->base.pc_next, BP_ANY)) {
-        gen_breakpoint(ctx);
-        return;
-    }
-
     /* Conditionally skip the next instruction, if indicated.  */
     if (ctx->skip_cond != TCG_COND_NEVER) {
         skip_label = gen_new_label();