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Diffstat (limited to 'nuttx/arch/arm/src/armv7-m/exc_return.h')
| -rw-r--r-- | nuttx/arch/arm/src/armv7-m/exc_return.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/nuttx/arch/arm/src/armv7-m/exc_return.h b/nuttx/arch/arm/src/armv7-m/exc_return.h deleted file mode 100644 index cffbd3e2e..000000000 --- a/nuttx/arch/arm/src/armv7-m/exc_return.h +++ /dev/null @@ -1,117 +0,0 @@ -/************************************************************************************ - * arch/arm/src/armv7-m/exc_return.h - * - * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ************************************************************************************/ - -#ifndef __ARCH_ARM_SRC_COMMON_CORTEXM_EXC_RETURN_H -#define __ARCH_ARM_SRC_COMMON_CORTEXM_EXC_RETURN_H - -/************************************************************************************ - * Included Files - ************************************************************************************/ - -#include <nuttx/config.h> - -/************************************************************************************ - * Pre-processor Definitions - ************************************************************************************/ - -/* The processor saves an EXC_RETURN value to the LR on exception entry. The - * exception mechanism relies on this value to detect when the processor has - * completed an exception handler. - * - * Bits [31:28] of an EXC_RETURN value are always 1. When the processor loads a - * value matching this pattern to the PC it detects that the operation is a not - * a normal branch operation and instead, that the exception is complete. - * Therefore, it starts the exception return sequence. - * - * Bits[4:0] of the EXC_RETURN value indicate the required return stack and eventual - * processor mode. The remaining bits of the EXC_RETURN value should be set to 1. - */ - -/* EXC_RETURN_BASE: Bits that are always set in an EXC_RETURN value. */ - -#define EXC_RETURN_BASE 0xffffffe1 - -/* EXC_RETURN_PROCESS_STACK: The exception saved (and will restore) the hardware - * context using the process stack pointer (if not set, the context was saved - * using the main stack pointer) - */ - -#define EXC_RETURN_PROCESS_STACK (1 << 2) - -/* EXC_RETURN_THREAD_MODE: The exception will return to thread mode (if not set, - * return stays in handler mode) - */ - -#define EXC_RETURN_THREAD_MODE (1 << 3) - -/* EXC_RETURN_STD_CONTEXT: The state saved on the stack does not include the - * volatile FP registers and FPSCR. If this bit is clear, the state does include - * these registers. - */ - -#define EXC_RETURN_STD_CONTEXT (1 << 4) - -/* EXC_RETURN_HANDLER: Return to handler mode. Exception return gets state from - * the main stack. Execution uses MSP after return. - */ - -#define EXC_RETURN_HANDLER 0xfffffff1 - -/* EXC_RETURN_PRIVTHR: Return to privileged thread mode. Exception return gets - * state from the main stack. Execution uses MSP after return. - */ - -#define EXC_RETURN_PRIVTHR 0xfffffff9 - -/* EXC_RETURN_UNPRIVTHR: Return to unprivileged thread mode. Exception return gets - * state from the process stack. Execution uses PSP after return. - */ - -#define EXC_RETURN_UNPRIVTHR 0xfffffffd - -/* In the kernel build is not selected, then all threads run in privileged thread - * mode. - */ - -#ifdef CONFIG_NUTTX_KERNEL -# define EXC_RETURN 0xfffffff9 -#endif - -/************************Th************************************************************ - * Inline Functions - ************************************************************************************/ - -#endif /* __ARCH_ARM_SRC_COMMON_CORTEXM_EXC_RETURN_H */ - |