target/xtensa: avoid IHI for writes to non-executable memory

[openocd.git] / src / jtag / swd.h

diff --git a/src/jtag/swd.h b/src/jtag/swd.h
index 0d1702c73e7ed58d96c3d23b921ce353829b92fa..5f626c1bf8612f190680a23a4a82f0bea03f7e64 100644 (file)
--- a/src/jtag/swd.h
+++ b/src/jtag/swd.h
@@ -1,45 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
 /***************************************************************************
  *   Copyright (C) 2009-2010 by David Brownell                             *
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- *   This program is distributed in the hope that it will be useful,       *
- *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- *   GNU General Public License for more details.                          *
- *                                                                         *
- *   You should have received a copy of the GNU General Public License     *
- *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 #ifndef OPENOCD_JTAG_SWD_H
 #define OPENOCD_JTAG_SWD_H
 
+#include <helper/log.h>
 #include <target/arm_adi_v5.h>
 
 /* Bits in SWD command packets, written from host to target
  * first bit on the wire is START
  */
 #define SWD_CMD_START  (1 << 0)        /* always set */
-#define SWD_CMD_APnDP  (1 << 1)        /* set only for AP access */
-#define SWD_CMD_RnW    (1 << 2)                /* set only for read access */
+#define SWD_CMD_APNDP  (1 << 1)        /* set only for AP access */
+#define SWD_CMD_RNW    (1 << 2)                /* set only for read access */
 #define SWD_CMD_A32    (3 << 3)                /* bits A[3:2] of register addr */
 #define SWD_CMD_PARITY (1 << 5)        /* parity of APnDP|RnW|A32 */
 #define SWD_CMD_STOP   (0 << 6)        /* always clear for synch SWD */
 #define SWD_CMD_PARK   (1 << 7)        /* driven high by host */
 /* followed by TRN, 3-bits of ACK, TRN */
 
+/*
+ * The SWD subsystem error codes
+ */
+#define ERROR_SWD_FAIL (-400)  /** protocol or parity error */
+#define ERROR_SWD_FAULT        (-401)  /** device returned FAULT in ACK field */
+
 /**
  * Construct a "cmd" byte, in lSB bit order, which swd_driver.read_reg()
  * and swd_driver.write_reg() methods will use directly.
  */
 static inline uint8_t swd_cmd(bool is_read, bool is_ap, uint8_t regnum)
 {
-       uint8_t cmd = (is_ap ? SWD_CMD_APnDP : 0)
-               | (is_read ? SWD_CMD_RnW : 0)
+       uint8_t cmd = (is_ap ? SWD_CMD_APNDP : 0)
+               | (is_read ? SWD_CMD_RNW : 0)
                | ((regnum & 0xc) << 1);
 
        /* 8 cmd bits 4:1 may be set */
@@ -53,6 +49,40 @@ static inline uint8_t swd_cmd(bool is_read, bool is_ap, uint8_t regnum)
 
 /* SWD_ACK_* bits are defined in <target/arm_adi_v5.h> */
 
+/**
+ * Test if we can rely on ACK returned by SWD command
+ *
+ * @param cmd Byte constructed by swd_cmd(), START, STOP and TRN are filtered off
+ * @returns true if ACK should be checked, false if should be ignored
+ */
+static inline bool swd_cmd_returns_ack(uint8_t cmd)
+{
+       uint8_t base_cmd = cmd & (SWD_CMD_APNDP | SWD_CMD_RNW | SWD_CMD_A32);
+
+       /* DPv2 does not reply to DP_TARGETSEL write cmd */
+       return base_cmd != swd_cmd(false, false, DP_TARGETSEL);
+}
+
+/**
+ * Convert SWD ACK value returned from DP to OpenOCD error code
+ *
+ * @param ack
+ * @returns error code
+ */
+static inline int swd_ack_to_error_code(uint8_t ack)
+{
+       switch (ack) {
+       case SWD_ACK_OK:
+               return ERROR_OK;
+       case SWD_ACK_WAIT:
+               return ERROR_WAIT;
+       case SWD_ACK_FAULT:
+               return ERROR_SWD_FAULT;
+       default:
+               return ERROR_SWD_FAIL;
+       }
+}
+
 /*
  * The following sequences are updated to
  * ARM(tm) Debug Interface v5 Architecture Specification    ARM IHI 0031E
@@ -277,6 +307,5 @@ struct swd_driver {
 };
 
 int swd_init_reset(struct command_context *cmd_ctx);
-void swd_add_reset(int req_srst);
 
 #endif /* OPENOCD_JTAG_SWD_H */