mirror of
https://github.com/torvalds/linux
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c0b52c143e
Signed-off-by: Alex Grad <alex.grad@gmail.com> Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
495 lines
15 KiB
C
495 lines
15 KiB
C
/*
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* PowerPC backend to the KGDB stub.
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*
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* 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
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* Copyright (C) 2003 Timesys Corporation.
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* Copyright (C) 2004-2006 MontaVista Software, Inc.
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* PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
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* PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
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* Sergei Shtylyov <sshtylyov@ru.mvista.com>
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* Copyright (C) 2007-2008 Wind River Systems, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program as licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/kgdb.h>
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#include <linux/smp.h>
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#include <linux/signal.h>
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#include <linux/ptrace.h>
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#include <linux/kdebug.h>
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#include <asm/current.h>
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#include <asm/processor.h>
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#include <asm/machdep.h>
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#include <asm/debug.h>
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#include <linux/slab.h>
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/*
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* This table contains the mapping between PowerPC hardware trap types, and
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* signals, which are primarily what GDB understands. GDB and the kernel
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* don't always agree on values, so we use constants taken from gdb-6.2.
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*/
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static struct hard_trap_info
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{
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unsigned int tt; /* Trap type code for powerpc */
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unsigned char signo; /* Signal that we map this trap into */
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} hard_trap_info[] = {
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{ 0x0100, 0x02 /* SIGINT */ }, /* system reset */
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{ 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */
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{ 0x0300, 0x0b /* SIGSEGV */ }, /* data access */
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{ 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */
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{ 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */
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{ 0x0600, 0x0a /* SIGBUS */ }, /* alignment */
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{ 0x0700, 0x05 /* SIGTRAP */ }, /* program check */
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{ 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */
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{ 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */
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{ 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */
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#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
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{ 0x2002, 0x05 /* SIGTRAP */ }, /* debug */
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#if defined(CONFIG_FSL_BOOKE)
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{ 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */
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{ 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */
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{ 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */
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{ 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */
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{ 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */
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{ 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */
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{ 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */
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{ 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */
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{ 0x3200, 0x02 /* SIGINT */ }, /* watchdog */
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#else /* ! CONFIG_FSL_BOOKE */
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{ 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */
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{ 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */
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{ 0x1020, 0x02 /* SIGINT */ }, /* watchdog */
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{ 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */
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{ 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */
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#endif
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#else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */
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{ 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */
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#if defined(CONFIG_8xx)
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{ 0x1000, 0x04 /* SIGILL */ }, /* software emulation */
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#else /* ! CONFIG_8xx */
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{ 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */
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{ 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */
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{ 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */
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#if defined(CONFIG_PPC64)
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{ 0x1200, 0x05 /* SIGILL */ }, /* system error */
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{ 0x1500, 0x04 /* SIGILL */ }, /* soft patch */
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{ 0x1600, 0x04 /* SIGILL */ }, /* maintenance */
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{ 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */
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{ 0x1800, 0x04 /* SIGILL */ }, /* thermal */
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#else /* ! CONFIG_PPC64 */
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{ 0x1400, 0x02 /* SIGINT */ }, /* SMI */
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{ 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */
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{ 0x1700, 0x04 /* SIGILL */ }, /* TAU */
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{ 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */
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#endif
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#endif
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#endif
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{ 0x0000, 0x00 } /* Must be last */
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};
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static int computeSignal(unsigned int tt)
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{
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struct hard_trap_info *ht;
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for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
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if (ht->tt == tt)
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return ht->signo;
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return SIGHUP; /* default for things we don't know about */
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}
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/**
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*
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* kgdb_skipexception - Bail out of KGDB when we've been triggered.
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* @exception: Exception vector number
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* @regs: Current &struct pt_regs.
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*
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* On some architectures we need to skip a breakpoint exception when
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* it occurs after a breakpoint has been removed.
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*
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*/
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int kgdb_skipexception(int exception, struct pt_regs *regs)
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{
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return kgdb_isremovedbreak(regs->nip);
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}
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static int kgdb_call_nmi_hook(struct pt_regs *regs)
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{
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kgdb_nmicallback(raw_smp_processor_id(), regs);
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return 0;
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}
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#ifdef CONFIG_SMP
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void kgdb_roundup_cpus(unsigned long flags)
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{
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smp_send_debugger_break();
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}
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#endif
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/* KGDB functions to use existing PowerPC64 hooks. */
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static int kgdb_debugger(struct pt_regs *regs)
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{
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return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
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DIE_OOPS, regs);
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}
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static int kgdb_handle_breakpoint(struct pt_regs *regs)
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{
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if (user_mode(regs))
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return 0;
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if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
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return 0;
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if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
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regs->nip += BREAK_INSTR_SIZE;
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return 1;
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}
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static int kgdb_singlestep(struct pt_regs *regs)
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{
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struct thread_info *thread_info, *exception_thread_info;
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struct thread_info *backup_current_thread_info;
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if (user_mode(regs))
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return 0;
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backup_current_thread_info = kmalloc(sizeof(struct thread_info), GFP_KERNEL);
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/*
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* On Book E and perhaps other processors, singlestep is handled on
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* the critical exception stack. This causes current_thread_info()
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* to fail, since it it locates the thread_info by masking off
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* the low bits of the current stack pointer. We work around
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* this issue by copying the thread_info from the kernel stack
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* before calling kgdb_handle_exception, and copying it back
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* afterwards. On most processors the copy is avoided since
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* exception_thread_info == thread_info.
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*/
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thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1));
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exception_thread_info = current_thread_info();
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if (thread_info != exception_thread_info) {
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/* Save the original current_thread_info. */
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memcpy(backup_current_thread_info, exception_thread_info, sizeof *thread_info);
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memcpy(exception_thread_info, thread_info, sizeof *thread_info);
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}
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kgdb_handle_exception(0, SIGTRAP, 0, regs);
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if (thread_info != exception_thread_info)
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/* Restore current_thread_info lastly. */
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memcpy(exception_thread_info, backup_current_thread_info, sizeof *thread_info);
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kfree(backup_current_thread_info);
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return 1;
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}
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static int kgdb_iabr_match(struct pt_regs *regs)
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{
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if (user_mode(regs))
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return 0;
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if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
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return 0;
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return 1;
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}
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static int kgdb_break_match(struct pt_regs *regs)
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{
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if (user_mode(regs))
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return 0;
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if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
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return 0;
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return 1;
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}
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#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)
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#define PACK32(ptr, src) do { \
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u32 *ptr32; \
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ptr32 = (u32 *)ptr; \
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*(ptr32++) = (src); \
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ptr = (unsigned long *)ptr32; \
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} while (0)
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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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struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
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STACK_FRAME_OVERHEAD);
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unsigned long *ptr = gdb_regs;
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int reg;
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memset(gdb_regs, 0, NUMREGBYTES);
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/* Regs GPR0-2 */
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for (reg = 0; reg < 3; reg++)
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PACK64(ptr, regs->gpr[reg]);
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/* Regs GPR3-13 are caller saved, not in regs->gpr[] */
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ptr += 11;
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/* Regs GPR14-31 */
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for (reg = 14; reg < 32; reg++)
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PACK64(ptr, regs->gpr[reg]);
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#ifdef CONFIG_FSL_BOOKE
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#ifdef CONFIG_SPE
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for (reg = 0; reg < 32; reg++)
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PACK64(ptr, p->thread.evr[reg]);
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#else
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ptr += 32;
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#endif
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#else
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/* fp registers not used by kernel, leave zero */
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ptr += 32 * 8 / sizeof(long);
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#endif
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PACK64(ptr, regs->nip);
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PACK64(ptr, regs->msr);
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PACK32(ptr, regs->ccr);
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PACK64(ptr, regs->link);
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PACK64(ptr, regs->ctr);
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PACK32(ptr, regs->xer);
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BUG_ON((unsigned long)ptr >
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(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
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}
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#define GDB_SIZEOF_REG sizeof(unsigned long)
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#define GDB_SIZEOF_REG_U32 sizeof(u32)
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#ifdef CONFIG_FSL_BOOKE
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#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
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#else
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#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
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#endif
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struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
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{
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{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
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{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
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{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
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{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
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{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
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{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
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{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
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{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
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{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
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{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
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{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
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{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
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{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
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{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
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{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
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{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
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{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
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{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
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{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
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{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
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{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
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{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
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{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
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{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
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{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
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{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
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{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
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{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
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{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
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{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
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{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
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{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
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{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
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{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
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{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
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{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
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{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
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{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
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{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
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{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
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{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
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{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
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{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
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{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
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{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
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{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
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{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
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{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
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{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
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{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
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{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
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{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
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{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
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{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
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{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
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{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
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{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
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{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
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{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
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{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
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{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
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{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
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{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
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{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },
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{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
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{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
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{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
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{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
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{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
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{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
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};
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char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
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{
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if (regno >= DBG_MAX_REG_NUM || regno < 0)
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return NULL;
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if (regno < 32 || regno >= 64)
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/* First 0 -> 31 gpr registers*/
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/* pc, msr, ls... registers 64 -> 69 */
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memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
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dbg_reg_def[regno].size);
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if (regno >= 32 && regno < 64) {
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/* FP registers 32 -> 63 */
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#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
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if (current)
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memcpy(mem, ¤t->thread.evr[regno-32],
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dbg_reg_def[regno].size);
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#else
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/* fp registers not used by kernel, leave zero */
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memset(mem, 0, dbg_reg_def[regno].size);
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#endif
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}
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return dbg_reg_def[regno].name;
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}
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int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
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{
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if (regno >= DBG_MAX_REG_NUM || regno < 0)
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return -EINVAL;
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if (regno < 32 || regno >= 64)
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/* First 0 -> 31 gpr registers*/
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/* pc, msr, ls... registers 64 -> 69 */
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memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
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dbg_reg_def[regno].size);
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if (regno >= 32 && regno < 64) {
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/* FP registers 32 -> 63 */
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#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
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memcpy(¤t->thread.evr[regno-32], mem,
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dbg_reg_def[regno].size);
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#else
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/* fp registers not used by kernel, leave zero */
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return 0;
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#endif
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}
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return 0;
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}
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void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
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{
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regs->nip = pc;
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}
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/*
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* This function does PowerPC specific procesing for interfacing to gdb.
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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 *linux_regs)
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{
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char *ptr = &remcom_in_buffer[1];
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unsigned long addr;
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switch (remcom_in_buffer[0]) {
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/*
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* sAA..AA Step one instruction from AA..AA
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* This will return an error to gdb ..
|
|
*/
|
|
case 's':
|
|
case 'c':
|
|
/* handle the optional parameter */
|
|
if (kgdb_hex2long(&ptr, &addr))
|
|
linux_regs->nip = addr;
|
|
|
|
atomic_set(&kgdb_cpu_doing_single_step, -1);
|
|
/* set the trace bit if we're stepping */
|
|
if (remcom_in_buffer[0] == 's') {
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
mtspr(SPRN_DBCR0,
|
|
mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
|
|
linux_regs->msr |= MSR_DE;
|
|
#else
|
|
linux_regs->msr |= MSR_SE;
|
|
#endif
|
|
atomic_set(&kgdb_cpu_doing_single_step,
|
|
raw_smp_processor_id());
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Global data
|
|
*/
|
|
struct kgdb_arch arch_kgdb_ops = {
|
|
.gdb_bpt_instr = {0x7d, 0x82, 0x10, 0x08},
|
|
};
|
|
|
|
static int kgdb_not_implemented(struct pt_regs *regs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void *old__debugger_ipi;
|
|
static void *old__debugger;
|
|
static void *old__debugger_bpt;
|
|
static void *old__debugger_sstep;
|
|
static void *old__debugger_iabr_match;
|
|
static void *old__debugger_break_match;
|
|
static void *old__debugger_fault_handler;
|
|
|
|
int kgdb_arch_init(void)
|
|
{
|
|
old__debugger_ipi = __debugger_ipi;
|
|
old__debugger = __debugger;
|
|
old__debugger_bpt = __debugger_bpt;
|
|
old__debugger_sstep = __debugger_sstep;
|
|
old__debugger_iabr_match = __debugger_iabr_match;
|
|
old__debugger_break_match = __debugger_break_match;
|
|
old__debugger_fault_handler = __debugger_fault_handler;
|
|
|
|
__debugger_ipi = kgdb_call_nmi_hook;
|
|
__debugger = kgdb_debugger;
|
|
__debugger_bpt = kgdb_handle_breakpoint;
|
|
__debugger_sstep = kgdb_singlestep;
|
|
__debugger_iabr_match = kgdb_iabr_match;
|
|
__debugger_break_match = kgdb_break_match;
|
|
__debugger_fault_handler = kgdb_not_implemented;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void kgdb_arch_exit(void)
|
|
{
|
|
__debugger_ipi = old__debugger_ipi;
|
|
__debugger = old__debugger;
|
|
__debugger_bpt = old__debugger_bpt;
|
|
__debugger_sstep = old__debugger_sstep;
|
|
__debugger_iabr_match = old__debugger_iabr_match;
|
|
__debugger_break_match = old__debugger_break_match;
|
|
__debugger_fault_handler = old__debugger_fault_handler;
|
|
}
|