void armv7a_show_fault_registers(target_t *target)
 {
        uint32_t dfsr, ifsr, dfar, ifar;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
 
        armv7a->read_cp15(target, 0, 0, 5, 0, &dfsr);
        armv7a->read_cp15(target, 0, 1, 5, 0, &ifsr);
                "disabled", "enabled"
        };
 
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
+       struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
 
        if (armv4_5->common_magic != ARMV4_5_COMMON_MAGIC)
        {
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        return dap_baseaddr_command(cmd_ctx, swjdp, args, argc);
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        return dap_memaccess_command(cmd_ctx, swjdp, args, argc);
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        return dap_apsel_command(cmd_ctx, swjdp, args, argc);
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        return dap_apid_command(cmd_ctx, swjdp, args, argc);
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
        uint32_t apsel;
 
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
        int thumb = 0;
        int count = 1;
        uint32_t address;
        default:
 usage:
                command_print(cmd_ctx,
-                       "usage: armv4_5 disassemble <address> [<count> ['thumb']]");
+                       "usage: armv7a disassemble <address> [<count> ['thumb']]");
                return ERROR_OK;
        }
 
 
  */
 int cortex_a8_init_debug_access(target_t *target)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        int retval;
 {
        uint32_t dscr;
        int retval;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
                uint32_t * regfile)
 {
        int retval = ERROR_OK;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        cortex_a8_dap_read_coreregister_u32(target, regfile, 0);
                uint8_t op1, uint8_t CRn, uint8_t CRm, uint8_t op2)
 {
        int retval;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        cortex_a8_exec_opcode(target, ARMV4_5_MRC(CP, op1, 0, CRn, CRm, op2));
 {
        int retval;
        uint32_t dscr;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        LOG_DEBUG("CP%i, CRn %i, value 0x%08" PRIx32, CP, CRn, value);
        int retval = ERROR_OK;
        uint8_t reg = regnum&0xFF;
        uint32_t dscr;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        if (reg > 16)
        int retval = ERROR_OK;
        uint8_t Rd = regnum&0xFF;
        uint32_t dscr;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
 int cortex_a8_dap_write_memap_register_u32(target_t *target, uint32_t address, uint32_t value)
 {
        int retval;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        retval = mem_ap_write_atomic_u32(swjdp, address, value);
 {
        int retval = ERROR_OK;
        uint32_t dscr;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = &cortex_a8->armv7a_common;
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
-
-
        enum target_state prev_target_state = target->state;
-
        uint8_t saved_apsel = dap_ap_get_select(swjdp);
+
        dap_ap_select(swjdp, swjdp_debugap);
        retval = mem_ap_read_atomic_u32(swjdp,
                        armv7a->debug_base + CPUDBG_DSCR, &dscr);
 {
        int retval = ERROR_OK;
        uint32_t dscr;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
-
        uint8_t saved_apsel = dap_ap_get_select(swjdp);
        dap_ap_select(swjdp, swjdp_debugap);
 
 int cortex_a8_resume(struct target_s *target, int current,
                uint32_t address, int handle_breakpoints, int debug_execution)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
+       struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
 //     breakpoint_t *breakpoint = NULL;
        uint32_t regfile[16], pc, cpsr, dscr;
        int retval = ERROR_OK;
        working_area_t *regfile_working_area = NULL;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
+       struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
 
 void cortex_a8_post_debug_entry(target_t *target)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = &cortex_a8->armv7a_common;
 
 //     cortex_a8_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
        /* examine cp15 control reg */
 int cortex_a8_step(struct target_s *target, int current, uint32_t address,
                int handle_breakpoints)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
+       struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
        breakpoint_t *breakpoint = NULL;
        breakpoint_t stepbreakpoint;
 
 {
        int i;
        uint32_t value;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
+       struct armv4_5_common_s *armv4_5 = &armv7a->armv4_5_common;
 
        LOG_DEBUG(" ");
 
                armv4_5_mode_t mode, uint32_t * value)
 {
        int retval;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 
        if ((num <= ARM_CPSR))
        {
 {
        int retval;
 //     uint32_t reg;
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 
 #ifdef ARMV7_GDB_HACKS
        /* If the LR register is being modified, make sure it will put us
 {
        uint32_t value;
        int retval;
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
+
        cortex_a8_dap_read_coreregister_u32(target, &value, num);
 
        if ((retval = jtag_execute_queue()) != ERROR_OK)
                enum armv4_5_mode mode, uint32_t value)
 {
        int retval;
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 
        cortex_a8_dap_write_coreregister_u32(target, value, num);
        if ((retval = jtag_execute_queue()) != ERROR_OK)
        int brp_i=0;
        uint32_t control;
        uint8_t byte_addr_select = 0x0F;
-
-
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = &cortex_a8->armv7a_common;
        cortex_a8_brp_t * brp_list = cortex_a8->brp_list;
 
        if (breakpoint->set)
 int cortex_a8_unset_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 {
        int retval;
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = &cortex_a8->armv7a_common;
        cortex_a8_brp_t * brp_list = cortex_a8->brp_list;
 
        if (!breakpoint->set)
 
 int cortex_a8_add_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
 
        if ((breakpoint->type == BKPT_HARD) && (cortex_a8->brp_num_available < 1))
        {
 
 int cortex_a8_remove_breakpoint(struct target_s *target, breakpoint_t *breakpoint)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
 
 #if 0
 /* It is perfectly possible to remove brakpoints while the taget is running */
 int cortex_a8_read_memory(struct target_s *target, uint32_t address,
                uint32_t size, uint32_t count, uint8_t *buffer)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        int retval = ERROR_OK;
 int cortex_a8_write_memory(struct target_s *target, uint32_t address,
                uint32_t size, uint32_t count, uint8_t *buffer)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
        int retval;
        target_t *target = priv;
        if (!target->type->examined)
                return ERROR_OK;
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
 
-
        if (!target->dbg_msg_enabled)
                return ERROR_OK;
 
 
 int cortex_a8_examine(struct target_s *target)
 {
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
-       cortex_a8_common_t *cortex_a8 = armv7a->arch_info;
+       struct cortex_a8_common_s *cortex_a8 = target_to_cortex_a8(target);
+       struct armv7a_common_s *armv7a = &cortex_a8->armv7a_common;
        swjdp_common_t *swjdp = &armv7a->swjdp_info;
-
-
        int i;
        int retval = ERROR_OK;
        uint32_t didr, ctypr, ttypr, cpuid;
 void cortex_a8_build_reg_cache(target_t *target)
 {
        reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
-       /* get pointers to arch-specific information */
-       armv4_5_common_t *armv4_5 = target->arch_info;
+       struct armv4_5_common_s *armv4_5 = target_to_armv4_5(target);
 
        (*cache_p) = armv4_5_build_reg_cache(target, armv4_5);
        armv4_5->core_cache = (*cache_p);
 
        /* Setup cortex_a8_common_t */
        cortex_a8->common_magic = CORTEX_A8_COMMON_MAGIC;
-       cortex_a8->arch_info = NULL;
-       armv7a->arch_info = cortex_a8;
        armv4_5->arch_info = armv7a;
 
        armv4_5_init_arch_info(target, armv4_5);
                char *cmd, char **args, int argc)
 {
        target_t *target = get_current_target(cmd_ctx);
-       armv4_5_common_t *armv4_5 = target->arch_info;
-       armv7a_common_t *armv7a = armv4_5->arch_info;
+       struct armv7a_common_s *armv7a = target_to_armv7a(target);
 
        return armv4_5_handle_cache_info_command(cmd_ctx,
                        &armv7a->armv4_5_mmu.armv4_5_cache);