cortex_a: fix FTBS on ARM due to alignment issues

Native compilation on RaspberryPi with
gcc (Debian 4.6.3-1) 4.6.3
Target: arm-linux-gnueabi

ends with error:

cortex_a.c: In function 'cortex_a8_read_apb_ab_memory':
cortex_a.c:2063:40: error: cast increases required alignment of target type [-Werror=cast-align]
cc1: all warnings being treated as errors

Also check for malloc failure.

This patch is compile-tested only.

Change-Id: I580c505424d03ac3a565de54182db22277c52ac1
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1369
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Reviewed-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

diff --git a/src/target/cortex_a.c b/src/target/cortex_a.c
index 7788ada6fef2c5efd88190b62ba5c24f10202639..cc6ae995eae47087d3b236af99786a8313e9d11c 100644 (file)
--- a/src/target/cortex_a.c
+++ b/src/target/cortex_a.c
@@ -1949,7 +1949,7 @@ static int cortex_a8_read_apb_ab_memory(struct target *target,
        int start_byte = address & 0x3;
        struct reg *reg;
        uint32_t dscr;
-       char *tmp_buff = NULL;
+       uint32_t *tmp_buff;
        uint32_t buff32[2];
        if (target->state != TARGET_HALTED) {
                LOG_WARNING("target not halted");
@@ -1958,6 +1958,14 @@ static int cortex_a8_read_apb_ab_memory(struct target *target,
 
        total_u32 = DIV_ROUND_UP((address & 3) + total_bytes, 4);
 
+       /* Due to offset word alignment, the  buffer may not have space
+        * to read the full first and last int32 words,
+        * hence, malloc space to read into, then copy and align into the buffer.
+        */
+       tmp_buff = malloc(total_u32 * 4);
+       if (tmp_buff == NULL)
+               return ERROR_FAIL;
+
        /* Mark register R0 as dirty, as it will be used
         * for transferring the data.
         * It will be restored automatically when exiting
@@ -2009,12 +2017,6 @@ static int cortex_a8_read_apb_ab_memory(struct target *target,
                goto error_unset_dtr_r;
 
 
-       /* Due to offset word alignment, the  buffer may not have space
-        * to read the full first and last int32 words,
-        * hence, malloc space to read into, then copy and align into the buffer.
-        */
-       tmp_buff = (char *) malloc(total_u32<<2);
-
        /* The last word needs to be handled separately - read all other words in one go.
         */
        if (total_u32 > 1) {
@@ -2023,7 +2025,7 @@ static int cortex_a8_read_apb_ab_memory(struct target *target,
                 *
                 * This data is read in aligned to 32 bit boundary, hence may need shifting later.
                 */
-               retval = mem_ap_sel_read_buf_u32_noincr(swjdp, armv7a->debug_ap, (uint8_t *)tmp_buff, (total_u32-1)<<2,
+               retval = mem_ap_sel_read_buf_u32_noincr(swjdp, armv7a->debug_ap, (uint8_t *)tmp_buff, (total_u32-1) * 4,
                                                                        armv7a->debug_base + CPUDBG_DTRTX);
                if (retval != ERROR_OK)
                        goto error_unset_dtr_r;
@@ -2060,12 +2062,12 @@ static int cortex_a8_read_apb_ab_memory(struct target *target,
 
        /* Read the last word */
        retval = mem_ap_sel_read_atomic_u32(swjdp, armv7a->debug_ap,
-                               armv7a->debug_base + CPUDBG_DTRTX, (uint32_t *)&tmp_buff[(total_u32-1)<<2]);
+                               armv7a->debug_base + CPUDBG_DTRTX, &tmp_buff[total_u32 - 1]);
        if (retval != ERROR_OK)
                goto error_free_buff_r;
 
        /* Copy and align the data into the output buffer */
-       memcpy(buffer, &tmp_buff[start_byte], total_bytes);
+       memcpy(buffer, (uint8_t *)tmp_buff + start_byte, total_bytes);
 
        free(tmp_buff);