8157107b13
Enter kernel debugger at boot with: --hvd UART_1=1 --hvx kgdbwait --hvx kgdboc=ttyS1,115200 or at runtime with: echo ttyS1,115200 > /sys/module/kgdboc/parameters/kgdboc echo g > /proc/sysrq-trigger Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
71 lines
2 KiB
C
71 lines
2 KiB
C
/*
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* Copyright 2013 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* TILE-Gx KGDB support.
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*/
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#ifndef __TILE_KGDB_H__
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#define __TILE_KGDB_H__
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#include <linux/kdebug.h>
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#include <arch/opcode.h>
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#define GDB_SIZEOF_REG sizeof(unsigned long)
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/*
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* TILE-Gx gdb is expecting the following register layout:
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* 56 GPRs(R0 - R52, TP, SP, LR), 8 special GPRs(networks and ZERO),
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* plus the PC and the faultnum.
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*
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* Even though kernel not use the 8 special GPRs, they need to be present
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* in the registers sent for correct processing in the host-side gdb.
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*
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*/
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#define DBG_MAX_REG_NUM (56+8+2)
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#define NUMREGBYTES (DBG_MAX_REG_NUM * GDB_SIZEOF_REG)
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/*
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* BUFMAX defines the maximum number of characters in inbound/outbound
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* buffers at least NUMREGBYTES*2 are needed for register packets,
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* Longer buffer is needed to list all threads.
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*/
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#define BUFMAX 2048
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#define BREAK_INSTR_SIZE TILEGX_BUNDLE_SIZE_IN_BYTES
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/*
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* Require cache flush for set/clear a software breakpoint or write memory.
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*/
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#define CACHE_FLUSH_IS_SAFE 1
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/*
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* The compiled-in breakpoint instruction can be used to "break" into
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* the debugger via magic system request key (sysrq-G).
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*/
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static tile_bundle_bits compiled_bpt = TILEGX_BPT_BUNDLE | DIE_COMPILED_BPT;
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enum tilegx_regnum {
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TILEGX_PC_REGNUM = TREG_LAST_GPR + 9,
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TILEGX_FAULTNUM_REGNUM,
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};
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/*
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* Generate a breakpoint exception to "break" into the debugger.
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*/
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static inline void arch_kgdb_breakpoint(void)
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{
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asm volatile (".quad %0\n\t"
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::""(compiled_bpt));
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}
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#endif /* __TILE_KGDB_H__ */
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