2 * Copyright (C) 2009 by David Brownell
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 * This is the interface to the Debug Programmers Model for ARMv6 and
26 * ARMv7 processors. ARMv6 processors (such as ARM11xx implementations)
27 * introduced a model which became part of the ARMv7-AR architecture
28 * which is most familiar through the Cortex-A series parts. While
29 * specific details differ (like how to write the instruction register),
30 * the high level models easily support shared code because those
31 * registers are compatible.
38 /* true if hardware state needs flushing */
43 struct breakpoint *bp;
48 struct watchpoint *wp;
53 * This wraps an implementation of DPM primitives. Each interface
54 * provider supplies a structure like this, which is the glue between
55 * upper level code and the lower level hardware access.
57 * It is a PRELIMINARY AND INCOMPLETE set of primitives, starting with
58 * support for CPU register access.
66 /** Invoke before a series of instruction operations */
67 int (*prepare)(struct arm_dpm *);
69 /** Invoke after a series of instruction operations */
70 int (*finish)(struct arm_dpm *);
74 /** Runs one instruction, writing data to DCC before execution. */
75 int (*instr_write_data_dcc)(struct arm_dpm *,
76 uint32_t opcode, uint32_t data);
78 /** Runs one instruction, writing data to R0 before execution. */
79 int (*instr_write_data_r0)(struct arm_dpm *,
80 uint32_t opcode, uint32_t data);
82 /** Optional core-specific operation invoked after CPSR writes. */
83 int (*instr_cpsr_sync)(struct arm_dpm *dpm);
87 /** Runs one instruction, reading data from dcc after execution. */
88 int (*instr_read_data_dcc)(struct arm_dpm *,
89 uint32_t opcode, uint32_t *data);
91 /** Runs one instruction, reading data from r0 after execution. */
92 int (*instr_read_data_r0)(struct arm_dpm *,
93 uint32_t opcode, uint32_t *data);
95 /* BREAKPOINT/WATCHPOINT SUPPORT */
98 * Enables one breakpoint or watchpoint by writing to the
99 * hardware registers. The specified breakpoint/watchpoint
100 * must currently be disabled. Indices 0..15 are used for
101 * breakpoints; indices 16..31 are for watchpoints.
103 int (*bpwp_enable)(struct arm_dpm *, unsigned index_value,
104 uint32_t addr, uint32_t control);
107 * Disables one breakpoint or watchpoint by clearing its
108 * hardware control registers. Indices are the same ones
109 * accepted by bpwp_enable().
111 int (*bpwp_disable)(struct arm_dpm *, unsigned index_value);
113 /* The breakpoint and watchpoint arrays are private to the
114 * DPM infrastructure. There are nbp indices in the dbp
115 * array. There are nwp indices in the dwp array.
123 /** Address of the instruction which triggered a watchpoint. */
126 /** Recent value of DSCR. */
129 // FIXME -- read/write DCSR methods and symbols
132 int arm_dpm_setup(struct arm_dpm *dpm);
133 int arm_dpm_initialize(struct arm_dpm *dpm);
135 int arm_dpm_read_current_registers(struct arm_dpm *);
136 int dpm_modeswitch(struct arm_dpm *dpm, enum arm_mode mode);
139 int arm_dpm_write_dirty_registers(struct arm_dpm *, bool bpwp);
141 void arm_dpm_report_wfar(struct arm_dpm *, uint32_t wfar);
143 /* Subset of DSCR bits; see ARMv7a arch spec section C10.3.1.
144 * Not all v7 bits are valid in v6.
146 #define DSCR_CORE_HALTED (1 << 0)
147 #define DSCR_CORE_RESTARTED (1 << 1)
148 #define DSCR_INT_DIS (1 << 11)
149 #define DSCR_ITR_EN (1 << 13)
150 #define DSCR_HALT_DBG_MODE (1 << 14)
151 #define DSCR_MON_DBG_MODE (1 << 15)
152 #define DSCR_INSTR_COMP (1 << 24)
153 #define DSCR_DTR_TX_FULL (1 << 29)
154 #define DSCR_DTR_RX_FULL (1 << 30)
156 #define DSCR_ENTRY(dscr) (((dscr) >> 2) & 0xf)
157 #define DSCR_RUN_MODE(dscr) ((dscr) & (DSCR_CORE_HALTED | DSCR_CORE_RESTARTED))
159 /* DRCR (debug run control register) bits */
160 #define DRCR_HALT (1 << 0)
161 #define DRCR_RESTART (1 << 1)
162 #define DRCR_CLEAR_EXCEPTIONS (1 << 2)
164 void arm_dpm_report_dscr(struct arm_dpm *dpm, uint32_t dcsr);
166 #endif /* __ARM_DPM_H */