From 5cbad0ebf45c5417104b383dc0e34f64fa7f2473 Mon Sep 17 00:00:00 2001 From: Jason Wessel Date: Wed, 20 Feb 2008 13:33:40 -0600 Subject: kgdb: support for ARCH=arm This patch adds the ARCH=arm specific a kgdb backend, originally written by Deepak Saxena and George Davis . Geoff Levand , Nicolas Pitre, Manish Lachwani, and Jason Wessel have contributed various fixups here as well. The KGDB patch makes one change to the core ARM architecture such that the traps are initialized early for use with the debugger or other subsystems. [ mingo@elte.hu: small cleanups. ] [ ben-linux@fluff.org: fixed early_trap_init ] Signed-off-by: Jason Wessel Acked-by: Deepak Saxena --- arch/arm/Kconfig | 1 + arch/arm/kernel/Makefile | 1 + arch/arm/kernel/kgdb.c | 201 +++++++++++++++++++++++++++++++++++++++++++++++ arch/arm/kernel/setup.c | 2 + arch/arm/kernel/traps.c | 5 ++ 5 files changed, 210 insertions(+) create mode 100644 arch/arm/kernel/kgdb.c (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index c7ad324ddf2..d048f6887d0 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -12,6 +12,7 @@ config ARM select RTC_LIB select SYS_SUPPORTS_APM_EMULATION select HAVE_OPROFILE + select HAVE_ARCH_KGDB select HAVE_KPROBES if (!XIP_KERNEL) select HAVE_KRETPROBES if (HAVE_KPROBES) select HAVE_FTRACE if (!XIP_KERNEL) diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index eb9092ca800..1d296fc8494 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o obj-$(CONFIG_ATAGS_PROC) += atags.o obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o obj-$(CONFIG_ARM_THUMBEE) += thumbee.o +obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312 diff --git a/arch/arm/kernel/kgdb.c b/arch/arm/kernel/kgdb.c new file mode 100644 index 00000000000..aaffaecffcd --- /dev/null +++ b/arch/arm/kernel/kgdb.c @@ -0,0 +1,201 @@ +/* + * arch/arm/kernel/kgdb.c + * + * ARM KGDB support + * + * Copyright (c) 2002-2004 MontaVista Software, Inc + * Copyright (c) 2008 Wind River Systems, Inc. + * + * Authors: George Davis + * Deepak Saxena + */ +#include +#include + +/* Make a local copy of the registers passed into the handler (bletch) */ +void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) +{ + int regno; + + /* Initialize all to zero. */ + for (regno = 0; regno < GDB_MAX_REGS; regno++) + gdb_regs[regno] = 0; + + gdb_regs[_R0] = kernel_regs->ARM_r0; + gdb_regs[_R1] = kernel_regs->ARM_r1; + gdb_regs[_R2] = kernel_regs->ARM_r2; + gdb_regs[_R3] = kernel_regs->ARM_r3; + gdb_regs[_R4] = kernel_regs->ARM_r4; + gdb_regs[_R5] = kernel_regs->ARM_r5; + gdb_regs[_R6] = kernel_regs->ARM_r6; + gdb_regs[_R7] = kernel_regs->ARM_r7; + gdb_regs[_R8] = kernel_regs->ARM_r8; + gdb_regs[_R9] = kernel_regs->ARM_r9; + gdb_regs[_R10] = kernel_regs->ARM_r10; + gdb_regs[_FP] = kernel_regs->ARM_fp; + gdb_regs[_IP] = kernel_regs->ARM_ip; + gdb_regs[_SPT] = kernel_regs->ARM_sp; + gdb_regs[_LR] = kernel_regs->ARM_lr; + gdb_regs[_PC] = kernel_regs->ARM_pc; + gdb_regs[_CPSR] = kernel_regs->ARM_cpsr; +} + +/* Copy local gdb registers back to kgdb regs, for later copy to kernel */ +void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *kernel_regs) +{ + kernel_regs->ARM_r0 = gdb_regs[_R0]; + kernel_regs->ARM_r1 = gdb_regs[_R1]; + kernel_regs->ARM_r2 = gdb_regs[_R2]; + kernel_regs->ARM_r3 = gdb_regs[_R3]; + kernel_regs->ARM_r4 = gdb_regs[_R4]; + kernel_regs->ARM_r5 = gdb_regs[_R5]; + kernel_regs->ARM_r6 = gdb_regs[_R6]; + kernel_regs->ARM_r7 = gdb_regs[_R7]; + kernel_regs->ARM_r8 = gdb_regs[_R8]; + kernel_regs->ARM_r9 = gdb_regs[_R9]; + kernel_regs->ARM_r10 = gdb_regs[_R10]; + kernel_regs->ARM_fp = gdb_regs[_FP]; + kernel_regs->ARM_ip = gdb_regs[_IP]; + kernel_regs->ARM_sp = gdb_regs[_SPT]; + kernel_regs->ARM_lr = gdb_regs[_LR]; + kernel_regs->ARM_pc = gdb_regs[_PC]; + kernel_regs->ARM_cpsr = gdb_regs[_CPSR]; +} + +void +sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task) +{ + struct pt_regs *thread_regs; + int regno; + + /* Just making sure... */ + if (task == NULL) + return; + + /* Initialize to zero */ + for (regno = 0; regno < GDB_MAX_REGS; regno++) + gdb_regs[regno] = 0; + + /* Otherwise, we have only some registers from switch_to() */ + thread_regs = task_pt_regs(task); + gdb_regs[_R0] = thread_regs->ARM_r0; + gdb_regs[_R1] = thread_regs->ARM_r1; + gdb_regs[_R2] = thread_regs->ARM_r2; + gdb_regs[_R3] = thread_regs->ARM_r3; + gdb_regs[_R4] = thread_regs->ARM_r4; + gdb_regs[_R5] = thread_regs->ARM_r5; + gdb_regs[_R6] = thread_regs->ARM_r6; + gdb_regs[_R7] = thread_regs->ARM_r7; + gdb_regs[_R8] = thread_regs->ARM_r8; + gdb_regs[_R9] = thread_regs->ARM_r9; + gdb_regs[_R10] = thread_regs->ARM_r10; + gdb_regs[_FP] = thread_regs->ARM_fp; + gdb_regs[_IP] = thread_regs->ARM_ip; + gdb_regs[_SPT] = thread_regs->ARM_sp; + gdb_regs[_LR] = thread_regs->ARM_lr; + gdb_regs[_PC] = thread_regs->ARM_pc; + gdb_regs[_CPSR] = thread_regs->ARM_cpsr; +} + +static int compiled_break; + +int kgdb_arch_handle_exception(int exception_vector, int signo, + int err_code, char *remcom_in_buffer, + char *remcom_out_buffer, + struct pt_regs *linux_regs) +{ + unsigned long addr; + char *ptr; + + switch (remcom_in_buffer[0]) { + case 'D': + case 'k': + case 'c': + kgdb_contthread = NULL; + + /* + * Try to read optional parameter, pc unchanged if no parm. + * If this was a compiled breakpoint, we need to move + * to the next instruction or we will just breakpoint + * over and over again. + */ + ptr = &remcom_in_buffer[1]; + if (kgdb_hex2long(&ptr, &addr)) + linux_regs->ARM_pc = addr; + else if (compiled_break == 1) + linux_regs->ARM_pc += 4; + + compiled_break = 0; + + return 0; + } + + return -1; +} + +static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr) +{ + kgdb_handle_exception(1, SIGTRAP, 0, regs); + + return 0; +} + +static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr) +{ + compiled_break = 1; + kgdb_handle_exception(1, SIGTRAP, 0, regs); + + return 0; +} + +static struct undef_hook kgdb_brkpt_hook = { + .instr_mask = 0xffffffff, + .instr_val = KGDB_BREAKINST, + .fn = kgdb_brk_fn +}; + +static struct undef_hook kgdb_compiled_brkpt_hook = { + .instr_mask = 0xffffffff, + .instr_val = KGDB_COMPILED_BREAK, + .fn = kgdb_compiled_brk_fn +}; + +/** + * kgdb_arch_init - Perform any architecture specific initalization. + * + * This function will handle the initalization of any architecture + * specific callbacks. + */ +int kgdb_arch_init(void) +{ + register_undef_hook(&kgdb_brkpt_hook); + register_undef_hook(&kgdb_compiled_brkpt_hook); + + return 0; +} + +/** + * kgdb_arch_exit - Perform any architecture specific uninitalization. + * + * This function will handle the uninitalization of any architecture + * specific callbacks, for dynamic registration and unregistration. + */ +void kgdb_arch_exit(void) +{ + unregister_undef_hook(&kgdb_brkpt_hook); + unregister_undef_hook(&kgdb_compiled_brkpt_hook); +} + +/* + * Register our undef instruction hooks with ARM undef core. + * We regsiter a hook specifically looking for the KGB break inst + * and we handle the normal undef case within the do_undefinstr + * handler. + */ +struct kgdb_arch arch_kgdb_ops = { +#ifndef __ARMEB__ + .gdb_bpt_instr = {0xfe, 0xde, 0xff, 0xe7} +#else /* ! __ARMEB__ */ + .gdb_bpt_instr = {0xe7, 0xff, 0xde, 0xfe} +#endif +}; diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index b7b0720bc1b..38f0e7940a1 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "compat.h" #include "atags.h" @@ -853,6 +854,7 @@ void __init setup_arch(char **cmdline_p) conswitchp = &dummy_con; #endif #endif + early_trap_init(); } diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index 5595fdd75e8..7277aef8309 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -707,6 +707,11 @@ void abort(void) EXPORT_SYMBOL(abort); void __init trap_init(void) +{ + return; +} + +void __init early_trap_init(void) { unsigned long vectors = CONFIG_VECTORS_BASE; extern char __stubs_start[], __stubs_end[]; -- cgit v1.2.3 From 17ce452f7ea3df760b7f9f42453b6f6acd765217 Mon Sep 17 00:00:00 2001 From: Jason Wessel Date: Wed, 23 Jul 2008 11:30:15 -0500 Subject: kgdb, powerpc: arch specific powerpc kgdb support This patch removes the old kgdb reminants from ARCH=powerpc and implements the new style arch specific stub for the common kgdb core interface. It is possible to have xmon and kgdb in the same kernel, but you cannot use both at the same time because there is only one set of debug hooks. The arch specific kgdb implementation saves the previous state of the debug hooks and restores them if you unconfigure the kgdb I/O driver. Kgdb should have no impact on a kernel that has no kgdb I/O driver configured. Signed-off-by: Jason Wessel --- arch/powerpc/Kconfig | 1 + arch/powerpc/Kconfig.debug | 50 +--- arch/powerpc/kernel/Makefile | 1 + arch/powerpc/kernel/kgdb.c | 410 ++++++++++++++++++++++++++++++++ arch/powerpc/kernel/setup_32.c | 16 -- arch/powerpc/platforms/powermac/setup.c | 6 - 6 files changed, 418 insertions(+), 66 deletions(-) create mode 100644 arch/powerpc/kernel/kgdb.c (limited to 'arch') diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 4c22242b396..737ebf9d12b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -112,6 +112,7 @@ config PPC select HAVE_FTRACE select HAVE_IDE select HAVE_KPROBES + select HAVE_ARCH_KGDB select HAVE_KRETPROBES select HAVE_LMB select HAVE_DMA_ATTRS if PPC64 diff --git a/arch/powerpc/Kconfig.debug b/arch/powerpc/Kconfig.debug index 2840ab69ef4..8c8aadbe956 100644 --- a/arch/powerpc/Kconfig.debug +++ b/arch/powerpc/Kconfig.debug @@ -41,22 +41,6 @@ config HCALL_STATS This option will add a small amount of overhead to all hypervisor calls. -config DEBUGGER - bool "Enable debugger hooks" - depends on DEBUG_KERNEL - help - Include in-kernel hooks for kernel debuggers. Unless you are - intending to debug the kernel, say N here. - -config KGDB - bool "Include kgdb kernel debugger" - depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx) - select DEBUG_INFO - help - Include in-kernel hooks for kgdb, the Linux kernel source level - debugger. See for more information. - Unless you are intending to debug the kernel, say N here. - config CODE_PATCHING_SELFTEST bool "Run self-tests of the code-patching code." depends on DEBUG_KERNEL @@ -67,36 +51,9 @@ config FTR_FIXUP_SELFTEST depends on DEBUG_KERNEL default n -choice - prompt "Serial Port" - depends on KGDB - default KGDB_TTYS1 - -config KGDB_TTYS0 - bool "ttyS0" - -config KGDB_TTYS1 - bool "ttyS1" - -config KGDB_TTYS2 - bool "ttyS2" - -config KGDB_TTYS3 - bool "ttyS3" - -endchoice - -config KGDB_CONSOLE - bool "Enable serial console thru kgdb port" - depends on KGDB && 8xx || CPM2 - help - If you enable this, all serial console messages will be sent - over the gdb stub. - If unsure, say N. - config XMON bool "Include xmon kernel debugger" - depends on DEBUGGER + depends on DEBUG_KERNEL help Include in-kernel hooks for the xmon kernel monitor/debugger. Unless you are intending to debug the kernel, say N here. @@ -126,6 +83,11 @@ config XMON_DISASSEMBLY to say Y here, unless you're building for a memory-constrained system. +config DEBUGGER + bool + depends on KGDB || XMON + default y + config IRQSTACKS bool "Use separate kernel stacks when processing interrupts" help diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index bf0b1fd0ec3..1a4094704b1 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -74,6 +74,7 @@ obj-y += time.o prom.o traps.o setup-common.o \ misc_$(CONFIG_WORD_SIZE).o obj-$(CONFIG_PPC32) += entry_32.o setup_32.o obj-$(CONFIG_PPC64) += dma_64.o iommu.o +obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o obj-$(CONFIG_MODULES) += ppc_ksyms.o obj-$(CONFIG_BOOTX_TEXT) += btext.o diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c new file mode 100644 index 00000000000..b4fdf2f2743 --- /dev/null +++ b/arch/powerpc/kernel/kgdb.c @@ -0,0 +1,410 @@ +/* + * PowerPC backend to the KGDB stub. + * + * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu) + * Copyright (C) 2003 Timesys Corporation. + * Copyright (C) 2004-2006 MontaVista Software, Inc. + * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com) + * PPC32 support restored by Vitaly Wool and + * Sergei Shtylyov + * Copyright (C) 2007-2008 Wind River Systems, Inc. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program as licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * This table contains the mapping between PowerPC hardware trap types, and + * signals, which are primarily what GDB understands. GDB and the kernel + * don't always agree on values, so we use constants taken from gdb-6.2. + */ +static struct hard_trap_info +{ + unsigned int tt; /* Trap type code for powerpc */ + unsigned char signo; /* Signal that we map this trap into */ +} hard_trap_info[] = { + { 0x0100, 0x02 /* SIGINT */ }, /* system reset */ + { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */ + { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */ + { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */ + { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */ + { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */ + { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */ + { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */ + { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */ + { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */ +#if defined(CONFIG_40x) || defined(CONFIG_BOOKE) + { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ +#if defined(CONFIG_FSL_BOOKE) + { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */ + { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */ + { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */ + { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */ + { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */ + { 0x2060, 0x0e /* SIGILL */ }, /* performace monitor */ + { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ + { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ + { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ +#else /* ! CONFIG_FSL_BOOKE */ + { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */ + { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */ + { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */ + { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */ + { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */ +#endif +#else /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */ + { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ +#if defined(CONFIG_8xx) + { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ +#else /* ! CONFIG_8xx */ + { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */ + { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */ + { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */ +#if defined(CONFIG_PPC64) + { 0x1200, 0x05 /* SIGILL */ }, /* system error */ + { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */ + { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */ + { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */ + { 0x1800, 0x04 /* SIGILL */ }, /* thermal */ +#else /* ! CONFIG_PPC64 */ + { 0x1400, 0x02 /* SIGINT */ }, /* SMI */ + { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */ + { 0x1700, 0x04 /* SIGILL */ }, /* TAU */ + { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */ +#endif +#endif +#endif + { 0x0000, 0x00 } /* Must be last */ +}; + +static int computeSignal(unsigned int tt) +{ + struct hard_trap_info *ht; + + for (ht = hard_trap_info; ht->tt && ht->signo; ht++) + if (ht->tt == tt) + return ht->signo; + + return SIGHUP; /* default for things we don't know about */ +} + +static int kgdb_call_nmi_hook(struct pt_regs *regs) +{ + kgdb_nmicallback(raw_smp_processor_id(), regs); + return 0; +} + +#ifdef CONFIG_SMP +void kgdb_roundup_cpus(unsigned long flags) +{ + smp_send_debugger_break(MSG_ALL_BUT_SELF); +} +#endif + +/* KGDB functions to use existing PowerPC64 hooks. */ +static int kgdb_debugger(struct pt_regs *regs) +{ + return kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs); +} + +static int kgdb_handle_breakpoint(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(0, SIGTRAP, 0, regs) != 0) + return 0; + + if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr)) + regs->nip += 4; + + return 1; +} + +static int kgdb_singlestep(struct pt_regs *regs) +{ + struct thread_info *thread_info, *exception_thread_info; + + if (user_mode(regs)) + return 0; + + /* + * On Book E and perhaps other processsors, singlestep is handled on + * the critical exception stack. This causes current_thread_info() + * to fail, since it it locates the thread_info by masking off + * the low bits of the current stack pointer. We work around + * this issue by copying the thread_info from the kernel stack + * before calling kgdb_handle_exception, and copying it back + * afterwards. On most processors the copy is avoided since + * exception_thread_info == thread_info. + */ + thread_info = (struct thread_info *)(regs->gpr[1] & ~(THREAD_SIZE-1)); + exception_thread_info = current_thread_info(); + + if (thread_info != exception_thread_info) + memcpy(exception_thread_info, thread_info, sizeof *thread_info); + + kgdb_handle_exception(0, SIGTRAP, 0, regs); + + if (thread_info != exception_thread_info) + memcpy(thread_info, exception_thread_info, sizeof *thread_info); + + return 1; +} + +static int kgdb_iabr_match(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) + return 0; + return 1; +} + +static int kgdb_dabr_match(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + + if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) + return 0; + return 1; +} + +#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) + +#define PACK32(ptr, src) do { \ + u32 *ptr32; \ + ptr32 = (u32 *)ptr; \ + *(ptr32++) = (src); \ + ptr = (unsigned long *)ptr32; \ + } while (0) + + +void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + unsigned long *ptr = gdb_regs; + int reg; + + memset(gdb_regs, 0, NUMREGBYTES); + + for (reg = 0; reg < 32; reg++) + PACK64(ptr, regs->gpr[reg]); + +#ifdef CONFIG_FSL_BOOKE +#ifdef CONFIG_SPE + for (reg = 0; reg < 32; reg++) + PACK64(ptr, current->thread.evr[reg]); +#else + ptr += 32; +#endif +#else + /* fp registers not used by kernel, leave zero */ + ptr += 32 * 8 / sizeof(long); +#endif + + PACK64(ptr, regs->nip); + PACK64(ptr, regs->msr); + PACK32(ptr, regs->ccr); + PACK64(ptr, regs->link); + PACK64(ptr, regs->ctr); + PACK32(ptr, regs->xer); + + BUG_ON((unsigned long)ptr > + (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); +} + +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ + struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + + STACK_FRAME_OVERHEAD); + unsigned long *ptr = gdb_regs; + int reg; + + memset(gdb_regs, 0, NUMREGBYTES); + + /* Regs GPR0-2 */ + for (reg = 0; reg < 3; reg++) + PACK64(ptr, regs->gpr[reg]); + + /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ + ptr += 11; + + /* Regs GPR14-31 */ + for (reg = 14; reg < 32; reg++) + PACK64(ptr, regs->gpr[reg]); + +#ifdef CONFIG_FSL_BOOKE +#ifdef CONFIG_SPE + for (reg = 0; reg < 32; reg++) + PACK64(ptr, p->thread.evr[reg]); +#else + ptr += 32; +#endif +#else + /* fp registers not used by kernel, leave zero */ + ptr += 32 * 8 / sizeof(long); +#endif + + PACK64(ptr, regs->nip); + PACK64(ptr, regs->msr); + PACK32(ptr, regs->ccr); + PACK64(ptr, regs->link); + PACK64(ptr, regs->ctr); + PACK32(ptr, regs->xer); + + BUG_ON((unsigned long)ptr > + (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); +} + +#define UNPACK64(dest, ptr) do { dest = *(ptr++); } while (0) + +#define UNPACK32(dest, ptr) do { \ + u32 *ptr32; \ + ptr32 = (u32 *)ptr; \ + dest = *(ptr32++); \ + ptr = (unsigned long *)ptr32; \ + } while (0) + +void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs) +{ + unsigned long *ptr = gdb_regs; + int reg; +#ifdef CONFIG_SPE + union { + u32 v32[2]; + u64 v64; + } acc; +#endif + + for (reg = 0; reg < 32; reg++) + UNPACK64(regs->gpr[reg], ptr); + +#ifdef CONFIG_FSL_BOOKE +#ifdef CONFIG_SPE + for (reg = 0; reg < 32; reg++) + UNPACK64(current->thread.evr[reg], ptr); +#else + ptr += 32; +#endif +#else + /* fp registers not used by kernel, leave zero */ + ptr += 32 * 8 / sizeof(int); +#endif + + UNPACK64(regs->nip, ptr); + UNPACK64(regs->msr, ptr); + UNPACK32(regs->ccr, ptr); + UNPACK64(regs->link, ptr); + UNPACK64(regs->ctr, ptr); + UNPACK32(regs->xer, ptr); + + BUG_ON((unsigned long)ptr > + (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); +} + +/* + * This function does PowerPC specific procesing for interfacing to gdb. + */ +int kgdb_arch_handle_exception(int vector, int signo, int err_code, + char *remcom_in_buffer, char *remcom_out_buffer, + struct pt_regs *linux_regs) +{ + char *ptr = &remcom_in_buffer[1]; + unsigned long addr; + + switch (remcom_in_buffer[0]) { + /* + * sAA..AA Step one instruction from AA..AA + * 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') { +#if defined(CONFIG_40x) || defined(CONFIG_BOOKE) + mtspr(SPRN_DBCR0, + mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); + linux_regs->msr |= MSR_DE; +#else + linux_regs->msr |= MSR_SE; +#endif + kgdb_single_step = 1; + if (kgdb_contthread) + 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_dabr_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_dabr_match = __debugger_dabr_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_dabr_match = kgdb_dabr_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_dabr_match = old__debugger_dabr_match; + __debugger_fault_handler = old__debugger_fault_handler; +} diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index 4efebe88e64..066e65c59b5 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -43,10 +43,6 @@ #define DBG(fmt...) -#if defined CONFIG_KGDB -#include -#endif - extern void bootx_init(unsigned long r4, unsigned long phys); int boot_cpuid; @@ -302,18 +298,6 @@ void __init setup_arch(char **cmdline_p) xmon_setup(); -#if defined(CONFIG_KGDB) - if (ppc_md.kgdb_map_scc) - ppc_md.kgdb_map_scc(); - set_debug_traps(); - if (strstr(cmd_line, "gdb")) { - if (ppc_md.progress) - ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000); - printk("kgdb breakpoint activated\n"); - breakpoint(); - } -#endif - /* * Set cache line size based on type of cpu as a default. * Systems with OF can look in the properties on the cpu node(s) diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c index 00bd0166d07..31635446901 100644 --- a/arch/powerpc/platforms/powermac/setup.c +++ b/arch/powerpc/platforms/powermac/setup.c @@ -97,8 +97,6 @@ extern struct machdep_calls pmac_md; int sccdbg; #endif -extern void zs_kgdb_hook(int tty_num); - sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN; EXPORT_SYMBOL(sys_ctrler); @@ -329,10 +327,6 @@ static void __init pmac_setup_arch(void) l2cr_init(); #endif /* CONFIG_PPC32 */ -#ifdef CONFIG_KGDB - zs_kgdb_hook(0); -#endif - find_via_cuda(); find_via_pmu(); smu_init(); -- cgit v1.2.3