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MN10300: Use KGDB
This commit is contained in:
David Howells
parent
67ddb4052d
commit
e460d64405
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@ -3,6 +3,8 @@ config MN10300
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select HAVE_OPROFILE
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select HAVE_GENERIC_HARDIRQS
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select GENERIC_HARDIRQS_NO_DEPRECATED
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ARCH_KGDB
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config AM33_2
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def_bool n
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@ -153,4 +153,4 @@ endmenu
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config KERNEL_DEBUGGER
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def_bool y
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depends on GDBSTUB
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depends on GDBSTUB || KGDB
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81
arch/mn10300/include/asm/kgdb.h
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81
arch/mn10300/include/asm/kgdb.h
Normal file
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@ -0,0 +1,81 @@
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/* Kernel debugger for MN10300
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*
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* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_KGDB_H
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#define _ASM_KGDB_H
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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 1024
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/*
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* Note that this register image is in a different order than the register
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* image that Linux produces at interrupt time.
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*/
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enum regnames {
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GDB_FR_D0 = 0,
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GDB_FR_D1 = 1,
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GDB_FR_D2 = 2,
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GDB_FR_D3 = 3,
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GDB_FR_A0 = 4,
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GDB_FR_A1 = 5,
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GDB_FR_A2 = 6,
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GDB_FR_A3 = 7,
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GDB_FR_SP = 8,
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GDB_FR_PC = 9,
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GDB_FR_MDR = 10,
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GDB_FR_EPSW = 11,
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GDB_FR_LIR = 12,
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GDB_FR_LAR = 13,
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GDB_FR_MDRQ = 14,
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GDB_FR_E0 = 15,
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GDB_FR_E1 = 16,
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GDB_FR_E2 = 17,
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GDB_FR_E3 = 18,
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GDB_FR_E4 = 19,
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GDB_FR_E5 = 20,
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GDB_FR_E6 = 21,
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GDB_FR_E7 = 22,
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GDB_FR_SSP = 23,
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GDB_FR_MSP = 24,
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GDB_FR_USP = 25,
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GDB_FR_MCRH = 26,
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GDB_FR_MCRL = 27,
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GDB_FR_MCVF = 28,
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GDB_FR_FPCR = 29,
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GDB_FR_DUMMY0 = 30,
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GDB_FR_DUMMY1 = 31,
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GDB_FR_FS0 = 32,
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GDB_FR_SIZE = 64,
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};
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#define GDB_ORIG_D0 41
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#define NUMREGBYTES (GDB_FR_SIZE*4)
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static inline void arch_kgdb_breakpoint(void)
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{
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asm(".globl __arch_kgdb_breakpoint; __arch_kgdb_breakpoint: break");
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}
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extern u8 __arch_kgdb_breakpoint;
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#define BREAK_INSTR_SIZE 1
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#define CACHE_FLUSH_IS_SAFE 1
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#endif /* _ASM_KGDB_H */
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@ -62,8 +62,9 @@
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* An alternate way of dealing with this could be to use the EPSW.S bits to
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* cache this information for systems with up to four CPUs.
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*/
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#define arch_smp_processor_id() (CPUID)
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#if 0
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#define raw_smp_processor_id() (CPUID)
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#define raw_smp_processor_id() (arch_smp_processor_id())
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#else
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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#endif
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@ -25,3 +25,4 @@ obj-$(CONFIG_MN10300_RTC) += rtc.o
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obj-$(CONFIG_PROFILE) += profile.o profile-low.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KGDB) += kgdb.o
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202
arch/mn10300/kernel/kgdb.c
Normal file
202
arch/mn10300/kernel/kgdb.c
Normal file
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@ -0,0 +1,202 @@
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/* kgdb support for MN10300
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*
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* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/ptrace.h>
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#include <linux/kgdb.h>
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#include <linux/uaccess.h>
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#include <unit/leds.h>
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#include <unit/serial.h>
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#include <asm/debugger.h>
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#include <asm/serial-regs.h>
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#include "internal.h"
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/*
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* Copy kernel exception frame registers to the GDB register file
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*/
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void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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{
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unsigned long ssp = (unsigned long) (regs + 1);
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gdb_regs[GDB_FR_D0] = regs->d0;
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gdb_regs[GDB_FR_D1] = regs->d1;
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gdb_regs[GDB_FR_D2] = regs->d2;
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gdb_regs[GDB_FR_D3] = regs->d3;
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gdb_regs[GDB_FR_A0] = regs->a0;
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gdb_regs[GDB_FR_A1] = regs->a1;
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gdb_regs[GDB_FR_A2] = regs->a2;
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gdb_regs[GDB_FR_A3] = regs->a3;
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gdb_regs[GDB_FR_SP] = (regs->epsw & EPSW_nSL) ? regs->sp : ssp;
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gdb_regs[GDB_FR_PC] = regs->pc;
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gdb_regs[GDB_FR_MDR] = regs->mdr;
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gdb_regs[GDB_FR_EPSW] = regs->epsw;
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gdb_regs[GDB_FR_LIR] = regs->lir;
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gdb_regs[GDB_FR_LAR] = regs->lar;
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gdb_regs[GDB_FR_MDRQ] = regs->mdrq;
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gdb_regs[GDB_FR_E0] = regs->e0;
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gdb_regs[GDB_FR_E1] = regs->e1;
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gdb_regs[GDB_FR_E2] = regs->e2;
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gdb_regs[GDB_FR_E3] = regs->e3;
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gdb_regs[GDB_FR_E4] = regs->e4;
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gdb_regs[GDB_FR_E5] = regs->e5;
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gdb_regs[GDB_FR_E6] = regs->e6;
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gdb_regs[GDB_FR_E7] = regs->e7;
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gdb_regs[GDB_FR_SSP] = ssp;
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gdb_regs[GDB_FR_MSP] = 0;
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gdb_regs[GDB_FR_USP] = regs->sp;
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gdb_regs[GDB_FR_MCRH] = regs->mcrh;
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gdb_regs[GDB_FR_MCRL] = regs->mcrl;
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gdb_regs[GDB_FR_MCVF] = regs->mcvf;
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gdb_regs[GDB_FR_DUMMY0] = 0;
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gdb_regs[GDB_FR_DUMMY1] = 0;
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gdb_regs[GDB_FR_FS0] = 0;
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}
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/*
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* Extracts kernel SP/PC values understandable by gdb from the values
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* saved by switch_to().
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*/
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
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{
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gdb_regs[GDB_FR_SSP] = p->thread.sp;
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gdb_regs[GDB_FR_PC] = p->thread.pc;
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gdb_regs[GDB_FR_A3] = p->thread.a3;
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gdb_regs[GDB_FR_USP] = p->thread.usp;
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gdb_regs[GDB_FR_FPCR] = p->thread.fpu_state.fpcr;
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}
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/*
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* Fill kernel exception frame registers from the GDB register file
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*/
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void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
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{
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regs->d0 = gdb_regs[GDB_FR_D0];
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regs->d1 = gdb_regs[GDB_FR_D1];
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regs->d2 = gdb_regs[GDB_FR_D2];
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regs->d3 = gdb_regs[GDB_FR_D3];
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regs->a0 = gdb_regs[GDB_FR_A0];
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regs->a1 = gdb_regs[GDB_FR_A1];
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regs->a2 = gdb_regs[GDB_FR_A2];
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regs->a3 = gdb_regs[GDB_FR_A3];
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regs->sp = gdb_regs[GDB_FR_SP];
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regs->pc = gdb_regs[GDB_FR_PC];
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regs->mdr = gdb_regs[GDB_FR_MDR];
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regs->epsw = gdb_regs[GDB_FR_EPSW];
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regs->lir = gdb_regs[GDB_FR_LIR];
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regs->lar = gdb_regs[GDB_FR_LAR];
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regs->mdrq = gdb_regs[GDB_FR_MDRQ];
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regs->e0 = gdb_regs[GDB_FR_E0];
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regs->e1 = gdb_regs[GDB_FR_E1];
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regs->e2 = gdb_regs[GDB_FR_E2];
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regs->e3 = gdb_regs[GDB_FR_E3];
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regs->e4 = gdb_regs[GDB_FR_E4];
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regs->e5 = gdb_regs[GDB_FR_E5];
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regs->e6 = gdb_regs[GDB_FR_E6];
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regs->e7 = gdb_regs[GDB_FR_E7];
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regs->sp = gdb_regs[GDB_FR_SSP];
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/* gdb_regs[GDB_FR_MSP]; */
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// regs->usp = gdb_regs[GDB_FR_USP];
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regs->mcrh = gdb_regs[GDB_FR_MCRH];
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regs->mcrl = gdb_regs[GDB_FR_MCRL];
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regs->mcvf = gdb_regs[GDB_FR_MCVF];
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/* gdb_regs[GDB_FR_DUMMY0]; */
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/* gdb_regs[GDB_FR_DUMMY1]; */
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// regs->fpcr = gdb_regs[GDB_FR_FPCR];
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// regs->fs0 = gdb_regs[GDB_FR_FS0];
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}
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struct kgdb_arch arch_kgdb_ops = {
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.gdb_bpt_instr = { 0xff },
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.flags = KGDB_HW_BREAKPOINT,
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};
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/*
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* Handle unknown packets and [Ccs] packets
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*/
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int kgdb_arch_handle_exception(int vector, int signo, int err_code,
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char *remcom_in_buffer, char *remcom_out_buffer,
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struct pt_regs *regs)
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{
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long addr;
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char *ptr;
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switch (remcom_in_buffer[0]) {
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case 'c':
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if (kgdb_contthread && kgdb_contthread != current) {
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strcpy(remcom_out_buffer, "E00");
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break;
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}
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kgdb_contthread = NULL;
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/* try to read optional parameter, pc unchanged if no parm */
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ptr = &remcom_in_buffer[1];
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if (kgdb_hex2long(&ptr, &addr))
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regs->pc = addr;
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return 0;
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case 's':
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break; /* we don't do hardware single stepping */
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}
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return -1; /* this means that we do not want to exit from the handler */
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}
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/*
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* Handle event interception
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* - returns 0 if the exception should be skipped, -ERROR otherwise.
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*/
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int debugger_intercept(enum exception_code excep, int signo, int si_code,
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struct pt_regs *regs)
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{
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int ret;
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ret = kgdb_handle_exception(excep, signo, si_code, regs);
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debugger_local_cache_flushinv();
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return ret;
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}
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/*
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* Determine if we've hit a debugger special breakpoint
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*/
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int at_debugger_breakpoint(struct pt_regs *regs)
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{
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return regs->pc == (unsigned long)&__arch_kgdb_breakpoint;
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}
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/*
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* Initialise kgdb
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*/
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int kgdb_arch_init(void)
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{
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return 0;
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}
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/*
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* Do something, perhaps, but don't know what.
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*/
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void kgdb_arch_exit(void)
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{
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}
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#ifdef CONFIG_SMP
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void debugger_nmi_interrupt(struct pt_regs *regs, enum exception_code code)
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{
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kgdb_nmicallback(arch_smp_processor_id(), regs);
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debugger_local_cache_flushinv();
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}
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void kgdb_roundup_cpus(unsigned long flags)
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{
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smp_jump_to_debugger();
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}
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#endif
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