ff640f197a
This patch extends the cortex_m3 maskisr command by a new option 'auto'. The 'auto' option handles interrupts during stepping in a way they are processed but don't disturb the program flow during debugging. Before one had to choose to either enable or disable interrupts. The former steps into interrupt handlers when they trigger. This disturbs the flow during debugging, making it hard to follow some piece of code when interrupts occur often. When interrupts are disabled, the flow isn't disturbed but code relying on interrupt handlers to be processed will stop working. For example a delay function counting the number of timer interrupts will never complete, RTOS task switching will not occur and output I/O queues of interrupt driven I/O will stall or overflow. Using the 'maskisr' command also typically requires gdb hooks to be supplied by the user to switch interrupts off during the step and to enable them again afterward. The new 'auto' option of the 'maskisr' command solves the above problems. When set, the step command allows pending interrupt handlers to be executed before the step, then the step is taken with interrupts disabled and finally interrupts are enabled again. This way interrupt processing stays in the background without disturbing the flow of debugging. No gdb hooks are required. The 'auto' option is the default, since it's believed that handling interrupts in this way is suitable for most users. The principle used for interrupt handling could probably be used for other targets too. Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>
189 lines
5.6 KiB
C
189 lines
5.6 KiB
C
/***************************************************************************
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* Copyright (C) 2005 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* *
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* Copyright (C) 2006 by Magnus Lundin *
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* lundin@mlu.mine.nu *
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* *
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* Copyright (C) 2008 by Spencer Oliver *
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* spen@spen-soft.co.uk *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#ifndef CORTEX_M3_H
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#define CORTEX_M3_H
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#include "armv7m.h"
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#define CORTEX_M3_COMMON_MAGIC 0x1A451A45
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#define SYSTEM_CONTROL_BASE 0x400FE000
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#define CPUID 0xE000ED00
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/* Debug Control Block */
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#define DCB_DHCSR 0xE000EDF0
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#define DCB_DCRSR 0xE000EDF4
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#define DCB_DCRDR 0xE000EDF8
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#define DCB_DEMCR 0xE000EDFC
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#define DCRSR_WnR (1 << 16)
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#define DWT_CTRL 0xE0001000
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#define DWT_CYCCNT 0xE0001004
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#define DWT_COMP0 0xE0001020
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#define DWT_MASK0 0xE0001024
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#define DWT_FUNCTION0 0xE0001028
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#define FP_CTRL 0xE0002000
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#define FP_REMAP 0xE0002004
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#define FP_COMP0 0xE0002008
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#define FP_COMP1 0xE000200C
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#define FP_COMP2 0xE0002010
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#define FP_COMP3 0xE0002014
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#define FP_COMP4 0xE0002018
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#define FP_COMP5 0xE000201C
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#define FP_COMP6 0xE0002020
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#define FP_COMP7 0xE0002024
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/* DCB_DHCSR bit and field definitions */
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#define DBGKEY (0xA05F << 16)
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#define C_DEBUGEN (1 << 0)
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#define C_HALT (1 << 1)
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#define C_STEP (1 << 2)
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#define C_MASKINTS (1 << 3)
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#define S_REGRDY (1 << 16)
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#define S_HALT (1 << 17)
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#define S_SLEEP (1 << 18)
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#define S_LOCKUP (1 << 19)
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#define S_RETIRE_ST (1 << 24)
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#define S_RESET_ST (1 << 25)
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/* DCB_DEMCR bit and field definitions */
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#define TRCENA (1 << 24)
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#define VC_HARDERR (1 << 10)
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#define VC_INTERR (1 << 9)
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#define VC_BUSERR (1 << 8)
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#define VC_STATERR (1 << 7)
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#define VC_CHKERR (1 << 6)
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#define VC_NOCPERR (1 << 5)
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#define VC_MMERR (1 << 4)
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#define VC_CORERESET (1 << 0)
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#define NVIC_ICTR 0xE000E004
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#define NVIC_ISE0 0xE000E100
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#define NVIC_ICSR 0xE000ED04
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#define NVIC_AIRCR 0xE000ED0C
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#define NVIC_SHCSR 0xE000ED24
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#define NVIC_CFSR 0xE000ED28
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#define NVIC_MMFSRb 0xE000ED28
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#define NVIC_BFSRb 0xE000ED29
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#define NVIC_USFSRh 0xE000ED2A
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#define NVIC_HFSR 0xE000ED2C
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#define NVIC_DFSR 0xE000ED30
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#define NVIC_MMFAR 0xE000ED34
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#define NVIC_BFAR 0xE000ED38
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/* NVIC_AIRCR bits */
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#define AIRCR_VECTKEY (0x5FA << 16)
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#define AIRCR_SYSRESETREQ (1 << 2)
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#define AIRCR_VECTCLRACTIVE (1 << 1)
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#define AIRCR_VECTRESET (1 << 0)
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/* NVIC_SHCSR bits */
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#define SHCSR_BUSFAULTENA (1 << 17)
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/* NVIC_DFSR bits */
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#define DFSR_HALTED 1
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#define DFSR_BKPT 2
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#define DFSR_DWTTRAP 4
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#define DFSR_VCATCH 8
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#define FPCR_CODE 0
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#define FPCR_LITERAL 1
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#define FPCR_REPLACE_REMAP (0 << 30)
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#define FPCR_REPLACE_BKPT_LOW (1 << 30)
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#define FPCR_REPLACE_BKPT_HIGH (2 << 30)
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#define FPCR_REPLACE_BKPT_BOTH (3 << 30)
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struct cortex_m3_fp_comparator
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{
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int used;
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int type;
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uint32_t fpcr_value;
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uint32_t fpcr_address;
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};
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struct cortex_m3_dwt_comparator
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{
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int used;
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uint32_t comp;
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uint32_t mask;
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uint32_t function;
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uint32_t dwt_comparator_address;
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};
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enum cortex_m3_soft_reset_config
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{
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CORTEX_M3_RESET_SYSRESETREQ,
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CORTEX_M3_RESET_VECTRESET,
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};
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enum cortex_m3_isrmasking_mode
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{
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CORTEX_M3_ISRMASK_AUTO,
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CORTEX_M3_ISRMASK_OFF,
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CORTEX_M3_ISRMASK_ON,
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};
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struct cortex_m3_common
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{
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int common_magic;
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struct arm_jtag jtag_info;
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/* Context information */
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uint32_t dcb_dhcsr;
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uint32_t nvic_dfsr; /* Debug Fault Status Register - shows reason for debug halt */
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uint32_t nvic_icsr; /* Interrupt Control State Register - shows active and pending IRQ */
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/* Flash Patch and Breakpoint (FPB) */
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int fp_num_lit;
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int fp_num_code;
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int fp_code_available;
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int fpb_enabled;
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int auto_bp_type;
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struct cortex_m3_fp_comparator *fp_comparator_list;
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/* Data Watchpoint and Trace (DWT) */
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int dwt_num_comp;
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int dwt_comp_available;
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struct cortex_m3_dwt_comparator *dwt_comparator_list;
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struct reg_cache *dwt_cache;
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enum cortex_m3_soft_reset_config soft_reset_config;
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enum cortex_m3_isrmasking_mode isrmasking_mode;
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struct armv7m_common armv7m;
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};
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static inline struct cortex_m3_common *
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target_to_cm3(struct target *target)
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{
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return container_of(target->arch_info,
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struct cortex_m3_common, armv7m);
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}
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#endif /* CORTEX_M3_H */
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