495 lines
14 KiB
C
495 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/kernel.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 <asm/code-patching.h>
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#include <linux/slab.h>
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#include <asm/inst.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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#ifdef CONFIG_BOOKE_OR_40x
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{ 0x2002, 0x05 /* SIGTRAP */ }, /* debug */
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#if defined(CONFIG_PPC_85xx)
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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_PPC_85xx */
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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 /* !CONFIG_BOOKE_OR_40x */
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{ 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */
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#if defined(CONFIG_PPC_8xx)
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{ 0x1000, 0x04 /* SIGILL */ }, /* software emulation */
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#else /* ! CONFIG_PPC_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_debugger_ipi(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(void)
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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 == BREAK_INSTR)
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regs_add_return_ip(regs, 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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if (user_mode(regs))
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return 0;
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kgdb_handle_exception(0, SIGTRAP, 0, regs);
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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_INT_FRAME_REGS);
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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_PPC_85xx
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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_PPC_85xx
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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_PPC_85xx) && 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_PPC_85xx) && 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_set_return_ip(regs, pc);
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}
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/*
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* This function does PowerPC specific processing 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 ..
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*/
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case 's':
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case 'c':
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/* handle the optional parameter */
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if (kgdb_hex2long(&ptr, &addr))
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regs_set_return_ip(linux_regs, addr);
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atomic_set(&kgdb_cpu_doing_single_step, -1);
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/* set the trace bit if we're stepping */
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if (remcom_in_buffer[0] == 's') {
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS
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mtspr(SPRN_DBCR0,
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mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
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regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE);
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#else
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regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE);
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#endif
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atomic_set(&kgdb_cpu_doing_single_step,
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raw_smp_processor_id());
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}
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return 0;
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}
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return -1;
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}
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int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
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{
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u32 instr, *addr = (u32 *)bpt->bpt_addr;
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int err;
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err = get_kernel_nofault(instr, addr);
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if (err)
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return err;
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err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
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if (err)
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return -EFAULT;
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*(u32 *)bpt->saved_instr = instr;
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return 0;
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|
}
|
|
|
|
int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
|
|
{
|
|
int err;
|
|
unsigned int instr = *(unsigned int *)bpt->saved_instr;
|
|
u32 *addr = (u32 *)bpt->bpt_addr;
|
|
|
|
err = patch_instruction(addr, ppc_inst(instr));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Global data
|
|
*/
|
|
const struct kgdb_arch arch_kgdb_ops;
|
|
|
|
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_debugger_ipi;
|
|
__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;
|
|
}
|