mips32: Added CP0 coprocessor R/W routines

[fw/openocd] / src / target / mips32.c

diff --git a/src/target/mips32.c b/src/target/mips32.c
index 65ea6e859193058e863d979f9bc9ddc3366d5590..d7f001e1f5de14010aafd266b159d1dd8a8b5e6f 100644 (file)
--- a/src/target/mips32.c
+++ b/src/target/mips32.c
@@ -7,6 +7,9 @@
  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
  *   oyvind.harboe@zylin.com                                               *
  *                                                                         *
+ *   Copyright (C) 2011 by Drasko DRASKOVIC                                *
+ *   drasko.draskovic@gmail.com                                            *
+ *                                                                         *
  *   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     *
@@ -758,3 +761,106 @@ int mips32_blank_check_memory(struct target *target,
 
        return ERROR_OK;
 }
+
+static int mips32_verify_pointer(struct command_context *cmd_ctx,
+               struct mips32_common *mips32)
+{
+       if (mips32->common_magic != MIPS32_COMMON_MAGIC) {
+               command_print(cmd_ctx, "target is not an MIPS32");
+               return ERROR_TARGET_INVALID;
+       }
+       return ERROR_OK;
+}
+
+/**
+ * MIPS32 targets expose command interface
+ * to manipulate CP0 registers
+ */
+COMMAND_HANDLER(mips32_handle_cp0_command)
+{
+       int retval;
+       struct target *target = get_current_target(CMD_CTX);
+       struct mips32_common *mips32 = target_to_mips32(target);
+       struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
+
+
+       retval = mips32_verify_pointer(CMD_CTX, mips32);
+       if (retval != ERROR_OK)
+               return retval;
+
+       if (target->state != TARGET_HALTED)
+       {
+               command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
+               return ERROR_OK;
+       }
+
+       /* two or more argument, access a single register/select (write if third argument is given) */
+       if (CMD_ARGC < 2)
+       {
+               command_print(CMD_CTX, "command requires more arguments.");
+       }
+       else
+       {
+               uint32_t cp0_reg, cp0_sel;
+               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], cp0_reg);
+               COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cp0_sel);
+
+               if (CMD_ARGC == 2)
+               {
+                       uint32_t value;
+
+                       if ((retval = mips32_cp0_read(ejtag_info, &value, cp0_reg, cp0_sel)) != ERROR_OK)
+                       {
+                               command_print(CMD_CTX,
+                                               "couldn't access reg %" PRIi32,
+                                               cp0_reg);
+                               return ERROR_OK;
+                       }
+                       if ((retval = jtag_execute_queue()) != ERROR_OK)
+                       {
+                               return retval;
+                       }
+
+                       command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
+                                       cp0_reg, cp0_sel, value);
+               }
+               else if (CMD_ARGC == 3)
+               {
+                       uint32_t value;
+                       COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], value);
+                       if ((retval = mips32_cp0_write(ejtag_info, value, cp0_reg, cp0_sel)) != ERROR_OK)
+                       {
+                               command_print(CMD_CTX,
+                                               "couldn't access cp0 reg %" PRIi32 ", select %" PRIi32,
+                                               cp0_reg,  cp0_sel);
+                               return ERROR_OK;
+                       }
+                       command_print(CMD_CTX, "cp0 reg %" PRIi32 ", select %" PRIi32 ": %8.8" PRIx32,
+                                       cp0_reg, cp0_sel, value);
+               }
+       }
+
+       return ERROR_OK;
+}
+
+static const struct command_registration mips32_exec_command_handlers[] = {
+       {
+               .name = "cp0",
+               .handler = mips32_handle_cp0_command,
+               .mode = COMMAND_EXEC,
+               .usage = "regnum select [value]",
+               .help = "display/modify cp0 register",
+       },
+       COMMAND_REGISTRATION_DONE
+};
+
+const struct command_registration mips32_command_handlers[] = {
+       {
+               .name = "mips32",
+               .mode = COMMAND_ANY,
+               .help = "mips32 command group",
+               .chain = mips32_exec_command_handlers,
+       },
+       COMMAND_REGISTRATION_DONE
+};
+