adi_v5: enforce check on AP number value

The AP number value is restricted in 8 bits unsigned by ADI-v5
specification. Nevertheless, an "invalid" value is used by
target cortex-m to force an automatic detection of the AP.

Replace magic numbers by using new macros for AP max number and
for the value of AP invalid.
Check the value passed through -ap-num flag during configuration.

Change-Id: Ic19a367db0ab11c0ebd070750eca0647d25279a5
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4668
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c
index 302ea78913cdc939ef9f92952fc670d8b345169c..b4e252bb495a7f927eaa4f0f1f6b0c7677d08548 100644 (file)
--- a/src/target/arm_adi_v5.c
+++ b/src/target/arm_adi_v5.c
@@ -793,7 +793,7 @@ int dap_find_ap(struct adiv5_dap *dap, enum ap_type type_to_find, struct adiv5_a
        int ap_num;
 
        /* Maximum AP number is 255 since the SELECT register is 8 bits */
-       for (ap_num = 0; ap_num <= 255; ap_num++) {
+       for (ap_num = 0; ap_num <= DP_APSEL_MAX; ap_num++) {
 
                /* read the IDR register of the Access Port */
                uint32_t id_val = 0;
@@ -1429,7 +1429,7 @@ int adiv5_jim_configure(struct target *target, Jim_GetOptInfo *goi)
        pc = (struct adiv5_private_config *)target->private_config;
        if (pc == NULL) {
                pc = calloc(1, sizeof(struct adiv5_private_config));
-               pc->ap_num = -1;
+               pc->ap_num = DP_APSEL_INVALID;
                target->private_config = pc;
        }
 
@@ -1498,6 +1498,10 @@ int adiv5_jim_configure(struct target *target, Jim_GetOptInfo *goi)
                                e = Jim_GetOpt_Wide(goi, &ap_num);
                                if (e != JIM_OK)
                                        return e;
+                               if (ap_num < 0 || ap_num > DP_APSEL_MAX) {
+                                       Jim_SetResultString(goi->interp, "Invalid AP number!", -1);
+                                       return JIM_ERR;
+                               }
                                pc->ap_num = ap_num;
                        } else {
                                if (goi->argc != 0) {
@@ -1507,7 +1511,7 @@ int adiv5_jim_configure(struct target *target, Jim_GetOptInfo *goi)
                                        return JIM_ERR;
                                }
 
-                               if (pc->ap_num < 0) {
+                               if (pc->ap_num == DP_APSEL_INVALID) {
                                        Jim_SetResultString(goi->interp, "AP number not configured", -1);
                                        return JIM_ERR;
                                }
@@ -1543,7 +1547,7 @@ COMMAND_HANDLER(handle_dap_info_command)
                break;
        case 1:
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-               if (apsel >= 256)
+               if (apsel > DP_APSEL_MAX)
                        return ERROR_COMMAND_SYNTAX_ERROR;
                break;
        default:
@@ -1566,7 +1570,7 @@ COMMAND_HANDLER(dap_baseaddr_command)
        case 1:
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
                /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel >= 256)
+               if (apsel > DP_APSEL_MAX)
                        return ERROR_COMMAND_SYNTAX_ERROR;
                break;
        default:
@@ -1625,7 +1629,7 @@ COMMAND_HANDLER(dap_apsel_command)
        case 1:
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
                /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel >= 256)
+               if (apsel > DP_APSEL_MAX)
                        return ERROR_COMMAND_SYNTAX_ERROR;
                break;
        default:
@@ -1691,7 +1695,7 @@ COMMAND_HANDLER(dap_apid_command)
        case 1:
                COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
                /* AP address is in bits 31:24 of DP_SELECT */
-               if (apsel >= 256)
+               if (apsel > DP_APSEL_MAX)
                        return ERROR_COMMAND_SYNTAX_ERROR;
                break;
        default:
@@ -1722,7 +1726,7 @@ COMMAND_HANDLER(dap_apreg_command)
 
        COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
        /* AP address is in bits 31:24 of DP_SELECT */
-       if (apsel >= 256)
+       if (apsel > DP_APSEL_MAX)
                return ERROR_COMMAND_SYNTAX_ERROR;
        ap = dap_ap(dap, apsel);
 

diff --git a/src/target/arm_adi_v5.h b/src/target/arm_adi_v5.h
index 883ac8b5d8df582225eba60d1f67a14a00d09a43..a340b76f07adc97022658f74e9656f210327426f 100644 (file)
--- a/src/target/arm_adi_v5.h
+++ b/src/target/arm_adi_v5.h
@@ -136,6 +136,9 @@
 #define DP_SELECT_DPBANK 0x0000000F
 #define DP_SELECT_INVALID 0x00FFFF00 /* Reserved bits one */
 
+#define DP_APSEL_MAX        (255)
+#define DP_APSEL_INVALID    (-1)
+
 /**
  * This represents an ARM Debug Interface (v5) Access Port (AP).
  * Most common is a MEM-AP, for memory access.

diff --git a/src/target/arm_cti.c b/src/target/arm_cti.c
index 0d117e76ded642e9622ab1dff174de896851d313..dcaf21e50a7550dce8e90a09a66c2c3d1806bab3 100644 (file)
--- a/src/target/arm_cti.c
+++ b/src/target/arm_cti.c
@@ -431,6 +431,10 @@ static int cti_configure(Jim_GetOptInfo *goi, struct arm_cti_object *cti)
                        e = Jim_GetOpt_Wide(goi, &w);
                        if (e != JIM_OK)
                                return e;
+                       if (w < 0 || w > DP_APSEL_MAX) {
+                               Jim_SetResultString(goi->interp, "-ap-num is invalid", -1);
+                               return JIM_ERR;
+                       }
                        cti->ap_num = (uint32_t)w;
                }
        }

diff --git a/src/target/arm_dap.c b/src/target/arm_dap.c
index 3be4d7199c1c9122d33d4ee7b335b36ade13cc55..3adb4ed267babe0ff5b5fc03274cfb1114deb5a3 100644 (file)
--- a/src/target/arm_dap.c
+++ b/src/target/arm_dap.c
@@ -48,7 +48,7 @@ static void dap_instance_init(struct adiv5_dap *dap)
 {
        int i;
        /* Set up with safe defaults */
-       for (i = 0; i <= 255; i++) {
+       for (i = 0; i <= DP_APSEL_MAX; i++) {
                dap->ap[i].dap = dap;
                dap->ap[i].ap_num = i;
                /* memaccess_tck max is 255 */
@@ -319,7 +319,7 @@ COMMAND_HANDLER(handle_dap_info_command)
                        break;
                case 1:
                        COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], apsel);
-                       if (apsel >= 256)
+                       if (apsel > DP_APSEL_MAX)
                                return ERROR_COMMAND_SYNTAX_ERROR;
                        break;
                default:

diff --git a/src/target/cortex_m.c b/src/target/cortex_m.c
index ca3dbec78dbc61b924d54230c66468b8db3f00c5..d1f7f3eea8e48560feaa49b81d58b3dd9980fe0f 100644 (file)
--- a/src/target/cortex_m.c
+++ b/src/target/cortex_m.c
@@ -1986,7 +1986,7 @@ int cortex_m_examine(struct target *target)
        /* stlink shares the examine handler but does not support
         * all its calls */
        if (!armv7m->stlink) {
-               if (cortex_m->apsel < 0) {
+               if (cortex_m->apsel == DP_APSEL_INVALID) {
                        /* Search for the MEM-AP */
                        retval = dap_find_ap(swjdp, AP_TYPE_AHB_AP, &armv7m->debug_ap);
                        if (retval != ERROR_OK) {