cortex_m: Fix possible endianness problem in emulated DCC channel

Change-Id: If7104464a8c65085f3ceac445e9c9be8446f2da9
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/1846
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

diff --git a/src/target/cortex_m.c b/src/target/cortex_m.c
index 578f6eebb7c9739339724a5c761494e794c510d8..a224788526480c74d8cb43876103ffc7968ece28 100644 (file)
--- a/src/target/cortex_m.c
+++ b/src/target/cortex_m.c
@@ -1879,12 +1879,19 @@ int cortex_m_examine(struct target *target)
        return ERROR_OK;
 }
 
-static int cortex_m_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *ctrl)
+static int cortex_m_dcc_read(struct target *target, uint8_t *value, uint8_t *ctrl)
 {
+       struct armv7m_common *armv7m = target_to_armv7m(target);
+       struct adiv5_dap *swjdp = armv7m->arm.dap;
        uint16_t dcrdr;
+       uint8_t buf[2];
        int retval;
 
-       mem_ap_read_buf_u16(swjdp, (uint8_t *)&dcrdr, 2, DCB_DCRDR);
+       retval = mem_ap_read(swjdp, buf, 2, 1, DCB_DCRDR, false);
+       if (retval != ERROR_OK)
+               return retval;
+
+       dcrdr = target_buffer_get_u16(target, buf);
        *ctrl = (uint8_t)dcrdr;
        *value = (uint8_t)(dcrdr >> 8);
 
@@ -1893,8 +1900,8 @@ static int cortex_m_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *c
        /* write ack back to software dcc register
         * signify we have read data */
        if (dcrdr & (1 << 0)) {
-               dcrdr = 0;
-               retval = mem_ap_write_buf_u16(swjdp, (uint8_t *)&dcrdr, 2, DCB_DCRDR);
+               target_buffer_set_u16(target, buf, 0);
+               retval = mem_ap_write(swjdp, buf, 2, 1, DCB_DCRDR, false);
                if (retval != ERROR_OK)
                        return retval;
        }
@@ -1905,14 +1912,12 @@ static int cortex_m_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *c
 static int cortex_m_target_request_data(struct target *target,
        uint32_t size, uint8_t *buffer)
 {
-       struct armv7m_common *armv7m = target_to_armv7m(target);
-       struct adiv5_dap *swjdp = armv7m->arm.dap;
        uint8_t data;
        uint8_t ctrl;
        uint32_t i;
 
        for (i = 0; i < (size * 4); i++) {
-               cortex_m_dcc_read(swjdp, &data, &ctrl);
+               cortex_m_dcc_read(target, &data, &ctrl);
                buffer[i] = data;
        }
 
@@ -1924,8 +1929,6 @@ static int cortex_m_handle_target_request(void *priv)
        struct target *target = priv;
        if (!target_was_examined(target))
                return ERROR_OK;
-       struct armv7m_common *armv7m = target_to_armv7m(target);
-       struct adiv5_dap *swjdp = armv7m->arm.dap;
 
        if (!target->dbg_msg_enabled)
                return ERROR_OK;
@@ -1934,7 +1937,7 @@ static int cortex_m_handle_target_request(void *priv)
                uint8_t data;
                uint8_t ctrl;
 
-               cortex_m_dcc_read(swjdp, &data, &ctrl);
+               cortex_m_dcc_read(target, &data, &ctrl);
 
                /* check if we have data */
                if (ctrl & (1 << 0)) {
@@ -1942,11 +1945,11 @@ static int cortex_m_handle_target_request(void *priv)
 
                        /* we assume target is quick enough */
                        request = data;
-                       cortex_m_dcc_read(swjdp, &data, &ctrl);
+                       cortex_m_dcc_read(target, &data, &ctrl);
                        request |= (data << 8);
-                       cortex_m_dcc_read(swjdp, &data, &ctrl);
+                       cortex_m_dcc_read(target, &data, &ctrl);
                        request |= (data << 16);
-                       cortex_m_dcc_read(swjdp, &data, &ctrl);
+                       cortex_m_dcc_read(target, &data, &ctrl);
                        request |= (data << 24);
                        target_request(target, request);
                }