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Commit 3abec857 authored by Paul Mackerras's avatar Paul Mackerras
Browse files

ppc64: Use merged versions of init_task.c and process.c. 



These two files are now built in arch/powerpc/kernel instead of
arch/ppc64/kernel.

Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent fd582ec8

arch/powerpc/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -42,7 +42,7 @@ endif 


else

# stuff used from here for ARCH=ppc or ARCH=ppc64

obj-$(CONFIG_PPC64)		+= traps.o

obj-$(CONFIG_PPC64)		+= traps.o process.o init_task.o



fpux-$(CONFIG_PPC32)		+= fpu.o

extra-$(CONFIG_PPC_FPU)		+= $(fpux-y)

arch/ppc64/kernel/Makefile

+2 −2
Original line number Diff line number Diff line
@@ -8,10 +8,10 @@ EXTRA_CFLAGS += -mno-minimal-toc 
extra-y		:= head.o vmlinux.lds



obj-y               :=	setup.o entry.o irq.o idle.o dma.o \

			time.o process.o signal.o syscalls.o misc.o ptrace.o \

			time.o signal.o syscalls.o misc.o ptrace.o \

			align.o bitops.o pacaData.o \

			udbg.o binfmt_elf32.o sys_ppc32.o ioctl32.o \

			ptrace32.o signal32.o rtc.o init_task.o \

			ptrace32.o signal32.o rtc.o \

			cputable.o cpu_setup_power4.o \

			iommu.o sysfs.o vdso.o pmc.o firmware.o prom.o

obj-y += vdso32/ vdso64/

arch/ppc64/kernel/init_task.c

deleted100644 → 0
+0 −36
Original line number Diff line number Diff line 
#include <linux/mm.h>

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/init.h>

#include <linux/init_task.h>

#include <linux/fs.h>

#include <linux/mqueue.h>

#include <asm/uaccess.h>



static struct fs_struct init_fs = INIT_FS;

static struct files_struct init_files = INIT_FILES;

static struct signal_struct init_signals = INIT_SIGNALS(init_signals);

static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);

struct mm_struct init_mm = INIT_MM(init_mm);



EXPORT_SYMBOL(init_mm);



/*

 * Initial thread structure.

 *

 * We need to make sure that this is 16384-byte aligned due to the

 * way process stacks are handled. This is done by having a special

 * "init_task" linker map entry..

 */

union thread_union init_thread_union 

	__attribute__((__section__(".data.init_task"))) =

		{ INIT_THREAD_INFO(init_task) };



/*

 * Initial task structure.

 *

 * All other task structs will be allocated on slabs in fork.c

 */

struct task_struct init_task = INIT_TASK(init_task);



EXPORT_SYMBOL(init_task);

arch/ppc64/kernel/process.c

deleted100644 → 0
+0 −713
Original line number Diff line number Diff line 
/*

 *  linux/arch/ppc64/kernel/process.c

 *

 *  Derived from "arch/i386/kernel/process.c"

 *    Copyright (C) 1995  Linus Torvalds

 *

 *  Updated and modified by Cort Dougan (cort@cs.nmt.edu) and

 *  Paul Mackerras (paulus@cs.anu.edu.au)

 *

 *  PowerPC version 

 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)

 *

 *  This program is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU General Public License

 *  as published by the Free Software Foundation; either version

 *  2 of the License, or (at your option) any later version.

 */



#include <linux/config.h>

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/sched.h>

#include <linux/kernel.h>

#include <linux/mm.h>

#include <linux/smp.h>

#include <linux/smp_lock.h>

#include <linux/stddef.h>

#include <linux/unistd.h>

#include <linux/slab.h>

#include <linux/user.h>

#include <linux/elf.h>

#include <linux/init.h>

#include <linux/init_task.h>

#include <linux/prctl.h>

#include <linux/ptrace.h>

#include <linux/kallsyms.h>

#include <linux/interrupt.h>

#include <linux/utsname.h>

#include <linux/kprobes.h>



#include <asm/pgtable.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/io.h>

#include <asm/processor.h>

#include <asm/mmu.h>

#include <asm/mmu_context.h>

#include <asm/prom.h>

#include <asm/ppcdebug.h>

#include <asm/machdep.h>

#include <asm/iSeries/HvCallHpt.h>

#include <asm/cputable.h>

#include <asm/firmware.h>

#include <asm/sections.h>

#include <asm/tlbflush.h>

#include <asm/time.h>

#include <asm/plpar_wrappers.h>



#ifndef CONFIG_SMP

struct task_struct *last_task_used_math = NULL;

struct task_struct *last_task_used_altivec = NULL;

#endif



/*

 * Make sure the floating-point register state in the

 * the thread_struct is up to date for task tsk.

 */

void flush_fp_to_thread(struct task_struct *tsk)

{

	if (tsk->thread.regs) {

		/*

		 * We need to disable preemption here because if we didn't,

		 * another process could get scheduled after the regs->msr

		 * test but before we have finished saving the FP registers

		 * to the thread_struct.  That process could take over the

		 * FPU, and then when we get scheduled again we would store

		 * bogus values for the remaining FP registers.

		 */

		preempt_disable();

		if (tsk->thread.regs->msr & MSR_FP) {

#ifdef CONFIG_SMP

			/*

			 * This should only ever be called for current or

			 * for a stopped child process.  Since we save away

			 * the FP register state on context switch on SMP,

			 * there is something wrong if a stopped child appears

			 * to still have its FP state in the CPU registers.

			 */

			BUG_ON(tsk != current);

#endif

			giveup_fpu(current);

		}

		preempt_enable();

	}

}



void enable_kernel_fp(void)

{

	WARN_ON(preemptible());



#ifdef CONFIG_SMP

	if (current->thread.regs && (current->thread.regs->msr & MSR_FP))

		giveup_fpu(current);

	else

		giveup_fpu(NULL);	/* just enables FP for kernel */

#else

	giveup_fpu(last_task_used_math);

#endif /* CONFIG_SMP */

}

EXPORT_SYMBOL(enable_kernel_fp);



int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)

{

	if (!tsk->thread.regs)

		return 0;

	flush_fp_to_thread(current);



	memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));



	return 1;

}



#ifdef CONFIG_ALTIVEC



void enable_kernel_altivec(void)

{

	WARN_ON(preemptible());



#ifdef CONFIG_SMP

	if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))

		giveup_altivec(current);

	else

		giveup_altivec(NULL);	/* just enables FP for kernel */

#else

	giveup_altivec(last_task_used_altivec);

#endif /* CONFIG_SMP */

}

EXPORT_SYMBOL(enable_kernel_altivec);



/*

 * Make sure the VMX/Altivec register state in the

 * the thread_struct is up to date for task tsk.

 */

void flush_altivec_to_thread(struct task_struct *tsk)

{

	if (tsk->thread.regs) {

		preempt_disable();

		if (tsk->thread.regs->msr & MSR_VEC) {

#ifdef CONFIG_SMP

			BUG_ON(tsk != current);

#endif

			giveup_altivec(current);

		}

		preempt_enable();

	}

}



int dump_task_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)

{

	flush_altivec_to_thread(current);

	memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));

	return 1;

}



#endif /* CONFIG_ALTIVEC */



static void set_dabr_spr(unsigned long val)

{

	mtspr(SPRN_DABR, val);

}



int set_dabr(unsigned long dabr)

{

	int ret = 0;



	if (firmware_has_feature(FW_FEATURE_XDABR)) {

		/* We want to catch accesses from kernel and userspace */

		unsigned long flags = H_DABRX_KERNEL|H_DABRX_USER;

		ret = plpar_set_xdabr(dabr, flags);

	} else if (firmware_has_feature(FW_FEATURE_DABR)) {

		ret = plpar_set_dabr(dabr);

	} else {

		set_dabr_spr(dabr);

	}



	return ret;

}



DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);

static DEFINE_PER_CPU(unsigned long, current_dabr);



struct task_struct *__switch_to(struct task_struct *prev,

				struct task_struct *new)

{

	struct thread_struct *new_thread, *old_thread;

	unsigned long flags;

	struct task_struct *last;



#ifdef CONFIG_SMP

	/* avoid complexity of lazy save/restore of fpu

	 * by just saving it every time we switch out if

	 * this task used the fpu during the last quantum.

	 * 

	 * If it tries to use the fpu again, it'll trap and

	 * reload its fp regs.  So we don't have to do a restore

	 * every switch, just a save.

	 *  -- Cort

	 */

	if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))

		giveup_fpu(prev);

#ifdef CONFIG_ALTIVEC

	if (prev->thread.regs && (prev->thread.regs->msr & MSR_VEC))

		giveup_altivec(prev);

#endif /* CONFIG_ALTIVEC */

#endif /* CONFIG_SMP */



#if defined(CONFIG_ALTIVEC) && !defined(CONFIG_SMP)

	/* Avoid the trap.  On smp this this never happens since

	 * we don't set last_task_used_altivec -- Cort

	 */

	if (new->thread.regs && last_task_used_altivec == new)

		new->thread.regs->msr |= MSR_VEC;

#endif /* CONFIG_ALTIVEC */



	if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr)) {

		set_dabr(new->thread.dabr);

		__get_cpu_var(current_dabr) = new->thread.dabr;

	}



	flush_tlb_pending();



	new_thread = &new->thread;

	old_thread = &current->thread;



	/* Collect purr utilization data per process and per processor

	 * wise purr is nothing but processor time base

	 */

	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {

		struct cpu_usage *cu = &__get_cpu_var(cpu_usage_array);

		long unsigned start_tb, current_tb;

		start_tb = old_thread->start_tb;

		cu->current_tb = current_tb = mfspr(SPRN_PURR);

		old_thread->accum_tb += (current_tb - start_tb);

		new_thread->start_tb = current_tb;

	}



	local_irq_save(flags);

	last = _switch(old_thread, new_thread);



	local_irq_restore(flags);



	return last;

}



static int instructions_to_print = 16;



static void show_instructions(struct pt_regs *regs)

{

	int i;

	unsigned long pc = regs->nip - (instructions_to_print * 3 / 4 *

			sizeof(int));



	printk("Instruction dump:");



	for (i = 0; i < instructions_to_print; i++) {

		int instr;



		if (!(i % 8))

			printk("\n");



		if (((REGION_ID(pc) != KERNEL_REGION_ID) &&

		     (REGION_ID(pc) != VMALLOC_REGION_ID)) ||

		     __get_user(instr, (unsigned int *)pc)) {

			printk("XXXXXXXX ");

		} else {

			if (regs->nip == pc)

				printk("<%08x> ", instr);

			else

				printk("%08x ", instr);

		}



		pc += sizeof(int);

	}



	printk("\n");

}



void show_regs(struct pt_regs * regs)

{

	int i;

	unsigned long trap;



	printk("NIP: %016lX XER: %08X LR: %016lX CTR: %016lX\n",

	       regs->nip, (unsigned int)regs->xer, regs->link, regs->ctr);

	printk("REGS: %p TRAP: %04lx   %s  (%s)\n",

	       regs, regs->trap, print_tainted(), system_utsname.release);

	printk("MSR: %016lx EE: %01x PR: %01x FP: %01x ME: %01x "

	       "IR/DR: %01x%01x CR: %08X\n",

	       regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,

	       regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,

	       regs->msr&MSR_IR ? 1 : 0,

	       regs->msr&MSR_DR ? 1 : 0,

	       (unsigned int)regs->ccr);

	trap = TRAP(regs);

	printk("DAR: %016lx DSISR: %016lx\n", regs->dar, regs->dsisr);

	printk("TASK: %p[%d] '%s' THREAD: %p",

	       current, current->pid, current->comm, current->thread_info);



#ifdef CONFIG_SMP

	printk(" CPU: %d", smp_processor_id());

#endif /* CONFIG_SMP */



	for (i = 0; i < 32; i++) {

		if ((i % 4) == 0) {

			printk("\n" KERN_INFO "GPR%02d: ", i);

		}



		printk("%016lX ", regs->gpr[i]);

		if (i == 13 && !FULL_REGS(regs))

			break;

	}

	printk("\n");

	/*

	 * Lookup NIP late so we have the best change of getting the

	 * above info out without failing

	 */

	printk("NIP [%016lx] ", regs->nip);

	print_symbol("%s\n", regs->nip);

	printk("LR [%016lx] ", regs->link);

	print_symbol("%s\n", regs->link);

	show_stack(current, (unsigned long *)regs->gpr[1]);

	if (!user_mode(regs))

		show_instructions(regs);

}



void exit_thread(void)

{

	kprobe_flush_task(current);



#ifndef CONFIG_SMP

	if (last_task_used_math == current)

		last_task_used_math = NULL;

#ifdef CONFIG_ALTIVEC

	if (last_task_used_altivec == current)

		last_task_used_altivec = NULL;

#endif /* CONFIG_ALTIVEC */

#endif /* CONFIG_SMP */

}



void flush_thread(void)

{

	struct thread_info *t = current_thread_info();



	kprobe_flush_task(current);

	if (t->flags & _TIF_ABI_PENDING)

		t->flags ^= (_TIF_ABI_PENDING | _TIF_32BIT);



#ifndef CONFIG_SMP

	if (last_task_used_math == current)

		last_task_used_math = NULL;

#ifdef CONFIG_ALTIVEC

	if (last_task_used_altivec == current)

		last_task_used_altivec = NULL;

#endif /* CONFIG_ALTIVEC */

#endif /* CONFIG_SMP */



	if (current->thread.dabr) {

		current->thread.dabr = 0;

		set_dabr(0);

	}

}



void

release_thread(struct task_struct *t)

{

}





/*

 * This gets called before we allocate a new thread and copy

 * the current task into it.

 */

void prepare_to_copy(struct task_struct *tsk)

{

	flush_fp_to_thread(current);

	flush_altivec_to_thread(current);

}



/*

 * Copy a thread..

 */

int

copy_thread(int nr, unsigned long clone_flags, unsigned long usp,

	    unsigned long unused, struct task_struct *p, struct pt_regs *regs)

{

	struct pt_regs *childregs, *kregs;

	extern void ret_from_fork(void);

	unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;



	/* Copy registers */

	sp -= sizeof(struct pt_regs);

	childregs = (struct pt_regs *) sp;

	*childregs = *regs;

	if ((childregs->msr & MSR_PR) == 0) {

		/* for kernel thread, set stackptr in new task */

		childregs->gpr[1] = sp + sizeof(struct pt_regs);

		p->thread.regs = NULL;	/* no user register state */

		clear_ti_thread_flag(p->thread_info, TIF_32BIT);

	} else {

		childregs->gpr[1] = usp;

		p->thread.regs = childregs;

		if (clone_flags & CLONE_SETTLS) {

			if (test_thread_flag(TIF_32BIT))

				childregs->gpr[2] = childregs->gpr[6];

			else

				childregs->gpr[13] = childregs->gpr[6];

		}

	}

	childregs->gpr[3] = 0;  /* Result from fork() */

	sp -= STACK_FRAME_OVERHEAD;



	/*

	 * The way this works is that at some point in the future

	 * some task will call _switch to switch to the new task.

	 * That will pop off the stack frame created below and start

	 * the new task running at ret_from_fork.  The new task will

	 * do some house keeping and then return from the fork or clone

	 * system call, using the stack frame created above.

	 */

	sp -= sizeof(struct pt_regs);

	kregs = (struct pt_regs *) sp;

	sp -= STACK_FRAME_OVERHEAD;

	p->thread.ksp = sp;

	if (cpu_has_feature(CPU_FTR_SLB)) {

		unsigned long sp_vsid = get_kernel_vsid(sp);



		sp_vsid <<= SLB_VSID_SHIFT;

		sp_vsid |= SLB_VSID_KERNEL;

		if (cpu_has_feature(CPU_FTR_16M_PAGE))

			sp_vsid |= SLB_VSID_L;



		p->thread.ksp_vsid = sp_vsid;

	}



	/*

	 * The PPC64 ABI makes use of a TOC to contain function 

	 * pointers.  The function (ret_from_except) is actually a pointer

	 * to the TOC entry.  The first entry is a pointer to the actual

	 * function.

 	 */

	kregs->nip = *((unsigned long *)ret_from_fork);



	return 0;

}



/*

 * Set up a thread for executing a new program

 */

void start_thread(struct pt_regs *regs, unsigned long fdptr, unsigned long sp)

{

	unsigned long entry, toc, load_addr = regs->gpr[2];



	/* fdptr is a relocated pointer to the function descriptor for

         * the elf _start routine.  The first entry in the function

         * descriptor is the entry address of _start and the second

         * entry is the TOC value we need to use.

         */

	set_fs(USER_DS);

	__get_user(entry, (unsigned long __user *)fdptr);

	__get_user(toc, (unsigned long __user *)fdptr+1);



	/* Check whether the e_entry function descriptor entries

	 * need to be relocated before we can use them.

	 */

	if (load_addr != 0) {

		entry += load_addr;

		toc   += load_addr;

	}



	/*

	 * If we exec out of a kernel thread then thread.regs will not be

	 * set. Do it now.

	 */

	if (!current->thread.regs) {

		unsigned long childregs = (unsigned long)current->thread_info +

						THREAD_SIZE;

		childregs -= sizeof(struct pt_regs);

		current->thread.regs = (struct pt_regs *)childregs;

	}



	regs->nip = entry;

	regs->gpr[1] = sp;

	regs->gpr[2] = toc;

	regs->msr = MSR_USER64;

#ifndef CONFIG_SMP

	if (last_task_used_math == current)

		last_task_used_math = 0;

#endif /* CONFIG_SMP */

	memset(current->thread.fpr, 0, sizeof(current->thread.fpr));

	current->thread.fpscr = 0;

#ifdef CONFIG_ALTIVEC

#ifndef CONFIG_SMP

	if (last_task_used_altivec == current)

		last_task_used_altivec = 0;

#endif /* CONFIG_SMP */

	memset(current->thread.vr, 0, sizeof(current->thread.vr));

	current->thread.vscr.u[0] = 0;

	current->thread.vscr.u[1] = 0;

	current->thread.vscr.u[2] = 0;

	current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */

	current->thread.vrsave = 0;

	current->thread.used_vr = 0;

#endif /* CONFIG_ALTIVEC */

}

EXPORT_SYMBOL(start_thread);



int set_fpexc_mode(struct task_struct *tsk, unsigned int val)

{

	struct pt_regs *regs = tsk->thread.regs;



	if (val > PR_FP_EXC_PRECISE)

		return -EINVAL;

	tsk->thread.fpexc_mode = __pack_fe01(val);

	if (regs != NULL && (regs->msr & MSR_FP) != 0)

		regs->msr = (regs->msr & ~(MSR_FE0|MSR_FE1))

			| tsk->thread.fpexc_mode;

	return 0;

}



int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)

{

	unsigned int val;



	val = __unpack_fe01(tsk->thread.fpexc_mode);

	return put_user(val, (unsigned int __user *) adr);

}



int sys_clone(unsigned long clone_flags, unsigned long p2, unsigned long p3,

	      unsigned long p4, unsigned long p5, unsigned long p6,

	      struct pt_regs *regs)

{

	unsigned long parent_tidptr = 0;

	unsigned long child_tidptr = 0;



	if (p2 == 0)

		p2 = regs->gpr[1];	/* stack pointer for child */



	if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_SETTID |

			   CLONE_CHILD_CLEARTID)) {

		parent_tidptr = p3;

		child_tidptr = p5;

		if (test_thread_flag(TIF_32BIT)) {

			parent_tidptr &= 0xffffffff;

			child_tidptr &= 0xffffffff;

		}

	}



	return do_fork(clone_flags, p2, regs, 0,

		    (int __user *)parent_tidptr, (int __user *)child_tidptr);

}



int sys_fork(unsigned long p1, unsigned long p2, unsigned long p3,

	     unsigned long p4, unsigned long p5, unsigned long p6,

	     struct pt_regs *regs)

{

	return do_fork(SIGCHLD, regs->gpr[1], regs, 0, NULL, NULL);

}



int sys_vfork(unsigned long p1, unsigned long p2, unsigned long p3,

	      unsigned long p4, unsigned long p5, unsigned long p6,

	      struct pt_regs *regs)

{

	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gpr[1], regs, 0,

	            NULL, NULL);

}



int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,

	       unsigned long a3, unsigned long a4, unsigned long a5,

	       struct pt_regs *regs)

{

	int error;

	char * filename;

	

	filename = getname((char __user *) a0);

	error = PTR_ERR(filename);

	if (IS_ERR(filename))

		goto out;

	flush_fp_to_thread(current);

	flush_altivec_to_thread(current);

	error = do_execve(filename, (char __user * __user *) a1,

				    (char __user * __user *) a2, regs);

  

	if (error == 0) {

		task_lock(current);

		current->ptrace &= ~PT_DTRACE;

		task_unlock(current);

	}

	putname(filename);



out:

	return error;

}



static int kstack_depth_to_print = 64;



static int validate_sp(unsigned long sp, struct task_struct *p,

		       unsigned long nbytes)

{

	unsigned long stack_page = (unsigned long)p->thread_info;



	if (sp >= stack_page + sizeof(struct thread_struct)

	    && sp <= stack_page + THREAD_SIZE - nbytes)

		return 1;



#ifdef CONFIG_IRQSTACKS

	stack_page = (unsigned long) hardirq_ctx[task_cpu(p)];

	if (sp >= stack_page + sizeof(struct thread_struct)

	    && sp <= stack_page + THREAD_SIZE - nbytes)

		return 1;



	stack_page = (unsigned long) softirq_ctx[task_cpu(p)];

	if (sp >= stack_page + sizeof(struct thread_struct)

	    && sp <= stack_page + THREAD_SIZE - nbytes)

		return 1;

#endif



	return 0;

}



unsigned long get_wchan(struct task_struct *p)

{

	unsigned long ip, sp;

	int count = 0;



	if (!p || p == current || p->state == TASK_RUNNING)

		return 0;



	sp = p->thread.ksp;

	if (!validate_sp(sp, p, 112))

		return 0;



	do {

		sp = *(unsigned long *)sp;

		if (!validate_sp(sp, p, 112))

			return 0;

		if (count > 0) {

			ip = *(unsigned long *)(sp + 16);

			if (!in_sched_functions(ip))

				return ip;

		}

	} while (count++ < 16);

	return 0;

}

EXPORT_SYMBOL(get_wchan);



void show_stack(struct task_struct *p, unsigned long *_sp)

{

	unsigned long ip, newsp, lr;

	int count = 0;

	unsigned long sp = (unsigned long)_sp;

	int firstframe = 1;



	if (sp == 0) {

		if (p) {

			sp = p->thread.ksp;

		} else {

			sp = __get_SP();

			p = current;

		}

	}



	lr = 0;

	printk("Call Trace:\n");

	do {

		if (!validate_sp(sp, p, 112))

			return;



		_sp = (unsigned long *) sp;

		newsp = _sp[0];

		ip = _sp[2];

		if (!firstframe || ip != lr) {

			printk("[%016lx] [%016lx] ", sp, ip);

			print_symbol("%s", ip);

			if (firstframe)

				printk(" (unreliable)");

			printk("\n");

		}

		firstframe = 0;



		/*

		 * See if this is an exception frame.

		 * We look for the "regshere" marker in the current frame.

		 */

		if (validate_sp(sp, p, sizeof(struct pt_regs) + 400)

		    && _sp[12] == 0x7265677368657265ul) {

			struct pt_regs *regs = (struct pt_regs *)

				(sp + STACK_FRAME_OVERHEAD);

			printk("--- Exception: %lx", regs->trap);

			print_symbol(" at %s\n", regs->nip);

			lr = regs->link;

			print_symbol("    LR = %s\n", lr);

			firstframe = 1;

		}



		sp = newsp;

	} while (count++ < kstack_depth_to_print);

}



void dump_stack(void)

{

	show_stack(current, (unsigned long *)__get_SP());

}

EXPORT_SYMBOL(dump_stack);

include/asm-ppc64/system.h

+4 −0
Original line number Diff line number Diff line
@@ -131,6 +131,10 @@ static inline void flush_altivec_to_thread(struct task_struct *t) 
}

#endif



static inline void flush_spe_to_thread(struct task_struct *t)

{

}



extern int mem_init_done;	/* set on boot once kmalloc can be called */



/* EBCDIC -> ASCII conversion for [0-9A-Z] on iSeries */