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ARM: new DPM interface

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First version of interface for sharing code between ARMv6 and ARMv7a
debug modules ... now the architecture includes debug support.  (Not
the same as for the trimmed-down v7m or v6m though!)  This is a first
version of an interface that will let the ARM11 and Cortex-A8 support
share code, features, and bugfixes.  Based on existing code from both
of those cores.

The ARM v7-AR architecture specification calls this commonality the
"Debug Programmer's Model (DPM)", which seemed to be an appropriate
acronym -- a TLA even! -- for use in our code.  Made it so.  :)

The initial scope of this just supports register access, and is geared
towards supporting top level "struct arm" mechanisms.  Later, things
like breakpoint and watchpoint support should be included.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell
2009-11-24 00:13:58 -08:00
parent ad75af0b17
commit e6dc927e97
5 changed files with 625 additions and 0 deletions
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src/target/arm_dpm.h Normal file
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/*
* Copyright (C) 2009 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, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __ARM_DPM_H
#define __ARM_DPM_H
/**
* @file
* This is the interface to the Debug Programmers Model for ARMv6 and
* ARMv7 processors. ARMv6 processors (such as ARM11xx implementations)
* introduced a model which became part of the ARMv7-AR architecture
* which is most familiar through the Cortex-A series parts. While
* specific details differ (like how to write the instruction register),
* the high level models easily support shared code because those
* registers are compatible.
*/
/**
* This wraps an implementation of DPM primitives. Each interface
* provider supplies a structure like this, which is the glue between
* upper level code and the lower level hardware access.
*
* It is a PRELIMINARY AND INCOMPLETE set of primitives, starting with
* support for CPU register access.
*/
struct arm_dpm {
struct arm *arm;
/** Cache of DIDR */
uint32_t didr;
/** Invoke before a series of instruction operations */
int (*prepare)(struct arm_dpm *);
/** Invoke after a series of instruction operations */
int (*finish)(struct arm_dpm *);
/* WRITE TO CPU */
/** Runs one instruction, writing data to DCC before execution. */
int (*instr_write_data_dcc)(struct arm_dpm *,
uint32_t opcode, uint32_t data);
/** Runs one instruction, writing data to R0 before execution. */
int (*instr_write_data_r0)(struct arm_dpm *,
uint32_t opcode, uint32_t data);
/* READ FROM CPU */
/** Runs one instruction, reading data from dcc after execution. */
int (*instr_read_data_dcc)(struct arm_dpm *,
uint32_t opcode, uint32_t *data);
/** Runs one instruction, reading data from r0 after execution. */
int (*instr_read_data_r0)(struct arm_dpm *,
uint32_t opcode, uint32_t *data);
// FIXME -- add breakpoint support
// FIXME -- add watchpoint support (including context-sensitive ones)
// FIXME -- read/write DCSR methods and symbols
};
int arm_dpm_setup(struct arm_dpm *dpm);
int arm_dpm_reinitialize(struct arm_dpm *dpm);
int arm_dpm_read_current_registers(struct arm_dpm *);
int arm_dpm_write_dirty_registers(struct arm_dpm *);
#endif /* __ARM_DPM_H */