cfi: unsupported code paths now report and return error

found by clang, would have done something undefined and mysterious
later on.

Change-Id: If7d7aca8514575d229ed0b17378bf8b1bbf347c4
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/133
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

diff --git a/src/flash/nor/cfi.c b/src/flash/nor/cfi.c
index f75efac34661d0612ed49e106e3259a239ce1802..62d2ae4989190522f2126d76ddd98a3b7e2afef7 100644 (file)
--- a/src/flash/nor/cfi.c
+++ b/src/flash/nor/cfi.c
@@ -1897,13 +1897,15 @@ static int cfi_spansion_write_block(struct flash_bank *bank, uint8_t *buffer,
                armv4_5_info.common_magic = ARMV7M_COMMON_MAGIC;
                armv4_5_info.core_mode = ARMV7M_MODE_HANDLER;
                armv4_5_info.core_state = ARM_STATE_ARM;
-       }
-       else
+       } else if (armv4_5_info.common_magic == ARM_COMMON_MAGIC)
        {
                /* All other ARM CPUs have 32 bit instructions */
                armv4_5_info.common_magic = ARM_COMMON_MAGIC;
                armv4_5_info.core_mode = ARM_MODE_SVC;
                armv4_5_info.core_state = ARM_STATE_ARM;
+       } else {
+               LOG_ERROR("Unknown ARM architecture");
+               return ERROR_FAIL;
        }
 
        int target_code_size = 0;
@@ -1912,11 +1914,12 @@ static int cfi_spansion_write_block(struct flash_bank *bank, uint8_t *buffer,
        switch (bank->bus_width)
        {
        case 1 :
-               if(armv4_5_info.common_magic == ARM_COMMON_MAGIC) /* armv4_5 target */
-               {
-                       target_code_src = armv4_5_word_8_code;
-                       target_code_size = sizeof(armv4_5_word_8_code);
+               if (armv4_5_info.common_magic != ARM_COMMON_MAGIC) {
+                       LOG_ERROR("Unknown ARM architecture");
+                       return ERROR_FAIL;
                }
+               target_code_src = armv4_5_word_8_code;
+               target_code_size = sizeof(armv4_5_word_8_code);
                break;
        case 2 :
                /* Check for DQ5 support */
@@ -1936,19 +1939,21 @@ static int cfi_spansion_write_block(struct flash_bank *bank, uint8_t *buffer,
                else
                {
                        /* No DQ5 support. Use DQ7 DATA# polling only. */
-                       if(armv4_5_info.common_magic == ARM_COMMON_MAGIC) // armv4_5 target
-                       {
-                               target_code_src = armv4_5_word_16_code_dq7only;
-                               target_code_size = sizeof(armv4_5_word_16_code_dq7only);
+                       if (armv4_5_info.common_magic != ARM_COMMON_MAGIC) {
+                               LOG_ERROR("Unknown ARM architecture");
+                               return ERROR_FAIL;
                        }
+                       target_code_src = armv4_5_word_16_code_dq7only;
+                       target_code_size = sizeof(armv4_5_word_16_code_dq7only);
                }
                break;
        case 4 :
-               if(armv4_5_info.common_magic == ARM_COMMON_MAGIC) // armv4_5 target
-               {
-                       target_code_src = armv4_5_word_32_code;
-                       target_code_size = sizeof(armv4_5_word_32_code);
+               if (armv4_5_info.common_magic != ARM_COMMON_MAGIC) {
+                       LOG_ERROR("Unknown ARM architecture");
+                       return ERROR_FAIL;
                }
+               target_code_src = armv4_5_word_32_code;
+               target_code_size = sizeof(armv4_5_word_32_code);
                break;
        default:
                LOG_ERROR("Unsupported bank buswidth %d, can't do block memory writes", bank->bus_width);