powerpc: make process.c suitable for both 32-bit and 64-bit (06d67d54) · Commits · EulixOS / Software / Kernel

arch/powerpc/kernel/init_task.c

0 → 100644

+36 −0

Original line number	Original line	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/powerpc/kernel/process.c

+309 −127

Original line number	Original line	Diff line number	Diff line
	@@ -36,6 +36,8 @@
	#include <linux/kallsyms.h>		#include <linux/kallsyms.h>
	#include <linux/mqueue.h>		#include <linux/mqueue.h>
	#include <linux/hardirq.h>		#include <linux/hardirq.h>
			#include <linux/utsname.h>
			#include <linux/kprobes.h>

	#include <asm/pgtable.h>		#include <asm/pgtable.h>
	#include <asm/uaccess.h>		#include <asm/uaccess.h>
	@@ -44,6 +46,11 @@
	#include <asm/processor.h>		#include <asm/processor.h>
	#include <asm/mmu.h>		#include <asm/mmu.h>
	#include <asm/prom.h>		#include <asm/prom.h>
			#ifdef CONFIG_PPC64
			#include <asm/firmware.h>
			#include <asm/plpar_wrappers.h>
			#include <asm/time.h>
			#endif

	extern unsigned long _get_SP(void);		extern unsigned long _get_SP(void);

	@@ -53,26 +60,6 @@ struct task_struct *last_task_used_altivec = NULL;
	struct task_struct *last_task_used_spe = NULL;		struct task_struct *last_task_used_spe = NULL;
	#endif		#endif

	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);

	/* this is 8kB-aligned so we can get to the thread_info struct
	at the base of it from the stack pointer with 1 integer instruction. */
	union thread_union init_thread_union
	__attribute__((__section__(".data.init_task"))) =
	{ INIT_THREAD_INFO(init_task) };

	/* initial task structure */
	struct task_struct init_task = INIT_TASK(init_task);
	EXPORT_SYMBOL(init_task);

	/* only used to get secondary processor up */
	struct task_struct *current_set[NR_CPUS] = {&init_task, };

	/*		/*
	* Make sure the floating-point register state in the		* Make sure the floating-point register state in the
	* the thread_struct is up to date for task tsk.		* the thread_struct is up to date for task tsk.
	@@ -237,7 +224,10 @@ int set_dabr(unsigned long dabr)
	return ret;		return ret;
	}		}

			#ifdef CONFIG_PPC64
			DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
	static DEFINE_PER_CPU(unsigned long, current_dabr);		static DEFINE_PER_CPU(unsigned long, current_dabr);
			#endif

	struct task_struct __switch_to(struct task_struct prev,		struct task_struct __switch_to(struct task_struct prev,
	struct task_struct *new)		struct task_struct *new)
	@@ -308,10 +298,27 @@ struct task_struct __switch_to(struct task_struct prev,
	set_dabr(new->thread.dabr);		set_dabr(new->thread.dabr);
	__get_cpu_var(current_dabr) = new->thread.dabr;		__get_cpu_var(current_dabr) = new->thread.dabr;
	}		}

			flush_tlb_pending();
	#endif		#endif

	new_thread = &new->thread;		new_thread = &new->thread;
	old_thread = &current->thread;		old_thread = &current->thread;

			#ifdef CONFIG_PPC64
			/*
			* Collect processor utilization data per process
			*/
			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;
			}
			#endif

	local_irq_save(flags);		local_irq_save(flags);
	last = _switch(old_thread, new_thread);		last = _switch(old_thread, new_thread);

	@@ -320,37 +327,106 @@ struct task_struct __switch_to(struct task_struct prev,
	return last;		return last;
	}		}

			static int instructions_to_print = 16;

			#ifdef CONFIG_PPC64
			#define BAD_PC(pc) ((REGION_ID(pc) != KERNEL_REGION_ID) && \
			(REGION_ID(pc) != VMALLOC_REGION_ID))
			#else
			#define BAD_PC(pc) ((pc) < KERNELBASE)
			#endif

			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 (BAD_PC(pc) \|\| __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");
			}

			static struct regbit {
			unsigned long bit;
			const char *name;
			} msr_bits[] = {
			{MSR_EE, "EE"},
			{MSR_PR, "PR"},
			{MSR_FP, "FP"},
			{MSR_ME, "ME"},
			{MSR_IR, "IR"},
			{MSR_DR, "DR"},
			{0, NULL}
			};

			static void printbits(unsigned long val, struct regbit *bits)
			{
			const char *sep = "";

			printk("<");
			for (; bits->bit; ++bits)
			if (val & bits->bit) {
			printk("%s%s", sep, bits->name);
			sep = ",";
			}
			printk(">");
			}

			#ifdef CONFIG_PPC64
			#define REG "%016lX"
			#define REGS_PER_LINE 4
			#define LAST_VOLATILE 13
			#else
			#define REG "%08lX"
			#define REGS_PER_LINE 8
			#define LAST_VOLATILE 12
			#endif

	void show_regs(struct pt_regs * regs)		void show_regs(struct pt_regs * regs)
	{		{
	int i, trap;		int i, trap;

	printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",		printk("NIP: "REG" LR: "REG" CTR: "REG"\n",
	regs->nip, regs->link, regs->gpr[1], regs, regs->trap,		regs->nip, regs->link, regs->ctr);
	print_tainted());		printk("REGS: %p TRAP: %04lx %s (%s)\n",
	printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",		regs, regs->trap, print_tainted(), system_utsname.release);
	regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,		printk("MSR: "REG" ", regs->msr);
	regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,		printbits(regs->msr, msr_bits);
	regs->msr&MSR_IR ? 1 : 0,		printk(" CR: %08lX XER: %08lX\n", regs->ccr, regs->xer);
	regs->msr&MSR_DR ? 1 : 0);
	trap = TRAP(regs);		trap = TRAP(regs);
	if (trap == 0x300 \|\| trap == 0x600)		if (trap == 0x300 \|\| trap == 0x600)
	printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);		printk("DAR: "REG", DSISR: "REG"\n", regs->dar, regs->dsisr);
	printk("TASK = %p[%d] '%s' THREAD: %p\n",		printk("TASK = %p[%d] '%s' THREAD: %p",
	current, current->pid, current->comm, current->thread_info);		current, current->pid, current->comm, current->thread_info);
	printk("Last syscall: %ld ", current->thread.last_syscall);

	#ifdef CONFIG_SMP		#ifdef CONFIG_SMP
	printk(" CPU: %d", smp_processor_id());		printk(" CPU: %d", smp_processor_id());
	#endif /* CONFIG_SMP */		#endif /* CONFIG_SMP */

	for (i = 0; i < 32; i++) {		for (i = 0; i < 32; i++) {
	long r;		if ((i % REGS_PER_LINE) == 0)
	if ((i % 8) == 0)
	printk("\n" KERN_INFO "GPR%02d: ", i);		printk("\n" KERN_INFO "GPR%02d: ", i);
	if (__get_user(r, &regs->gpr[i]))		printk(REG " ", regs->gpr[i]);
	break;		if (i == LAST_VOLATILE && !FULL_REGS(regs))
	printk("%08lX ", r);
	if (i == 12 && !FULL_REGS(regs))
	break;		break;
	}		}
	printk("\n");		printk("\n");
	@@ -359,16 +435,20 @@ void show_regs(struct pt_regs * regs)
	* Lookup NIP late so we have the best change of getting the		* Lookup NIP late so we have the best change of getting the
	* above info out without failing		* above info out without failing
	*/		*/
	printk("NIP [%08lx] ", regs->nip);		printk("NIP ["REG"] ", regs->nip);
	print_symbol("%s\n", regs->nip);		print_symbol("%s\n", regs->nip);
	printk("LR [%08lx] ", regs->link);		printk("LR ["REG"] ", regs->link);
	print_symbol("%s\n", regs->link);		print_symbol("%s\n", regs->link);
	#endif		#endif
	show_stack(current, (unsigned long *) regs->gpr[1]);		show_stack(current, (unsigned long *) regs->gpr[1]);
			if (!user_mode(regs))
			show_instructions(regs);
	}		}

	void exit_thread(void)		void exit_thread(void)
	{		{
			kprobe_flush_task(current);

	#ifndef CONFIG_SMP		#ifndef CONFIG_SMP
	if (last_task_used_math == current)		if (last_task_used_math == current)
	last_task_used_math = NULL;		last_task_used_math = NULL;
	@@ -385,6 +465,14 @@ void exit_thread(void)

	void flush_thread(void)		void flush_thread(void)
	{		{
			#ifdef CONFIG_PPC64
			struct thread_info *t = current_thread_info();

			if (t->flags & _TIF_ABI_PENDING)
			t->flags ^= (_TIF_ABI_PENDING \| _TIF_32BIT);
			#endif
			kprobe_flush_task(current);

	#ifndef CONFIG_SMP		#ifndef CONFIG_SMP
	if (last_task_used_math == current)		if (last_task_used_math == current)
	last_task_used_math = NULL;		last_task_used_math = NULL;
	@@ -425,15 +513,13 @@ void prepare_to_copy(struct task_struct *tsk)
	/*		/*
	* Copy a thread..		* Copy a thread..
	*/		*/
	int		int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	copy_thread(int nr, unsigned long clone_flags, unsigned long usp,		unsigned long unused, struct task_struct *p,
	unsigned long unused,		struct pt_regs *regs)
	struct task_struct p, struct pt_regs regs)
	{		{
	struct pt_regs childregs, kregs;		struct pt_regs childregs, kregs;
	extern void ret_from_fork(void);		extern void ret_from_fork(void);
	unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;		unsigned long sp = (unsigned long)p->thread_info + THREAD_SIZE;
	unsigned long childframe;

	CHECK_FULL_REGS(regs);		CHECK_FULL_REGS(regs);
	/* Copy registers */		/* Copy registers */
	@@ -443,17 +529,26 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	if ((childregs->msr & MSR_PR) == 0) {		if ((childregs->msr & MSR_PR) == 0) {
	/* for kernel thread, set `current' and stackptr in new task */		/* for kernel thread, set `current' and stackptr in new task */
	childregs->gpr[1] = sp + sizeof(struct pt_regs);		childregs->gpr[1] = sp + sizeof(struct pt_regs);
			#ifdef CONFIG_PPC32
	childregs->gpr[2] = (unsigned long) p;		childregs->gpr[2] = (unsigned long) p;
			#else
			clear_ti_thread_flag(p->thread_info, TIF_32BIT);
			#endif
	p->thread.regs = NULL; /* no user register state */		p->thread.regs = NULL; /* no user register state */
	} else {		} else {
	childregs->gpr[1] = usp;		childregs->gpr[1] = usp;
	p->thread.regs = childregs;		p->thread.regs = childregs;
	if (clone_flags & CLONE_SETTLS)		if (clone_flags & CLONE_SETTLS) {
			#ifdef CONFIG_PPC64
			if (!test_thread_flag(TIF_32BIT))
			childregs->gpr[13] = childregs->gpr[6];
			else
			#endif
	childregs->gpr[2] = childregs->gpr[6];		childregs->gpr[2] = childregs->gpr[6];
	}		}
			}
	childregs->gpr[3] = 0; /* Result from fork() */		childregs->gpr[3] = 0; /* Result from fork() */
	sp -= STACK_FRAME_OVERHEAD;		sp -= STACK_FRAME_OVERHEAD;
	childframe = sp;

	/*		/*
	* The way this works is that at some point in the future		* The way this works is that at some point in the future
	@@ -467,9 +562,30 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	kregs = (struct pt_regs *) sp;		kregs = (struct pt_regs *) sp;
	sp -= STACK_FRAME_OVERHEAD;		sp -= STACK_FRAME_OVERHEAD;
	p->thread.ksp = sp;		p->thread.ksp = sp;
	kregs->nip = (unsigned long)ret_from_fork;

			#ifdef CONFIG_PPC64
			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);
			#else
			kregs->nip = (unsigned long)ret_from_fork;
	p->thread.last_syscall = -1;		p->thread.last_syscall = -1;
			#endif

	return 0;		return 0;
	}		}
	@@ -477,18 +593,61 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	/*		/*
	* Set up a thread for executing a new program		* Set up a thread for executing a new program
	*/		*/
	void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)		void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
	{		{
	set_fs(USER_DS);		set_fs(USER_DS);

			/*
			* 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;
			}

	memset(regs->gpr, 0, sizeof(regs->gpr));		memset(regs->gpr, 0, sizeof(regs->gpr));
	regs->ctr = 0;		regs->ctr = 0;
	regs->link = 0;		regs->link = 0;
	regs->xer = 0;		regs->xer = 0;
	regs->ccr = 0;		regs->ccr = 0;
	regs->mq = 0;
	regs->nip = nip;
	regs->gpr[1] = sp;		regs->gpr[1] = sp;

			#ifdef CONFIG_PPC32
			regs->mq = 0;
			regs->nip = start;
	regs->msr = MSR_USER;		regs->msr = MSR_USER;
			#else
			if (test_thread_flag(TIF_32BIT)) {
			unsigned long entry, toc, load_addr = regs->gpr[2];

			/* start 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.
			*/
			__get_user(entry, (unsigned long __user *)start);
			__get_user(toc, (unsigned long __user *)start+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;
			}
			regs->nip = entry;
			regs->gpr[2] = toc;
			regs->msr = MSR_USER64;
			} else {
			regs->nip = start;
			regs->gpr[2] = 0;
			regs->msr = MSR_USER32;
			}
			#endif

	#ifndef CONFIG_SMP		#ifndef CONFIG_SMP
	if (last_task_used_math == current)		if (last_task_used_math == current)
	last_task_used_math = NULL;		last_task_used_math = NULL;
	@@ -506,6 +665,7 @@ void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
	#ifdef CONFIG_ALTIVEC		#ifdef CONFIG_ALTIVEC
	memset(current->thread.vr, 0, sizeof(current->thread.vr));		memset(current->thread.vr, 0, sizeof(current->thread.vr));
	memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));		memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
			current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */
	current->thread.vrsave = 0;		current->thread.vrsave = 0;
	current->thread.used_vr = 0;		current->thread.used_vr = 0;
	#endif /* CONFIG_ALTIVEC */		#endif /* CONFIG_ALTIVEC */
	@@ -532,10 +692,12 @@ int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
	#ifdef CONFIG_SPE		#ifdef CONFIG_SPE
	tsk->thread.fpexc_mode = val &		tsk->thread.fpexc_mode = val &
	(PR_FP_EXC_SW_ENABLE \| PR_FP_ALL_EXCEPT);		(PR_FP_EXC_SW_ENABLE \| PR_FP_ALL_EXCEPT);
			return 0;
	#else		#else
	return -EINVAL;		return -EINVAL;
	#endif		#endif
	} else {		}

	/* on a CONFIG_SPE this does not hurt us. The bits that		/* on a CONFIG_SPE this does not hurt us. The bits that
	* __pack_fe01 use do not overlap with bits used for		* __pack_fe01 use do not overlap with bits used for
	* PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits		* PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
	@@ -547,7 +709,6 @@ int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
	if (regs != NULL && (regs->msr & MSR_FP) != 0)		if (regs != NULL && (regs->msr & MSR_FP) != 0)
	regs->msr = (regs->msr & ~(MSR_FE0\|MSR_FE1))		regs->msr = (regs->msr & ~(MSR_FE0\|MSR_FE1))
	\| tsk->thread.fpexc_mode;		\| tsk->thread.fpexc_mode;
	}
	return 0;		return 0;
	}		}

	@@ -566,6 +727,8 @@ int get_fpexc_mode(struct task_struct *tsk, unsigned long adr)
	return put_user(val, (unsigned int __user *) adr);		return put_user(val, (unsigned int __user *) adr);
	}		}

			#define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff))

	int sys_clone(unsigned long clone_flags, unsigned long usp,		int sys_clone(unsigned long clone_flags, unsigned long usp,
	int __user parent_tidp, void __user child_threadptr,		int __user parent_tidp, void __user child_threadptr,
	int __user *child_tidp, int p6,		int __user *child_tidp, int p6,
	@@ -574,6 +737,12 @@ int sys_clone(unsigned long clone_flags, unsigned long usp,
	CHECK_FULL_REGS(regs);		CHECK_FULL_REGS(regs);
	if (usp == 0)		if (usp == 0)
	usp = regs->gpr[1]; /* stack pointer for child */		usp = regs->gpr[1]; /* stack pointer for child */
			#ifdef CONFIG_PPC64
			if (test_thread_flag(TIF_32BIT)) {
			parent_tidp = TRUNC_PTR(parent_tidp);
			child_tidp = TRUNC_PTR(child_tidp);
			}
			#endif
	return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);		return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
	}		}

	@@ -644,20 +813,53 @@ static int validate_sp(unsigned long sp, struct task_struct *p,
	return 0;		return 0;
	}		}

	void dump_stack(void)		#ifdef CONFIG_PPC64
			#define MIN_STACK_FRAME 112 /* same as STACK_FRAME_OVERHEAD, in fact */
			#define FRAME_LR_SAVE 2
			#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
			#define REGS_MARKER 0x7265677368657265ul
			#define FRAME_MARKER 12
			#else
			#define MIN_STACK_FRAME 16
			#define FRAME_LR_SAVE 1
			#define INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
			#define REGS_MARKER 0x72656773ul
			#define FRAME_MARKER 2
			#endif

			unsigned long get_wchan(struct task_struct *p)
	{		{
	show_stack(current, NULL);		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, MIN_STACK_FRAME))
			return 0;

			do {
			sp = (unsigned long )sp;
			if (!validate_sp(sp, p, MIN_STACK_FRAME))
			return 0;
			if (count > 0) {
			ip = ((unsigned long *)sp)[FRAME_LR_SAVE];
			if (!in_sched_functions(ip))
			return ip;
	}		}
			} while (count++ < 16);
			return 0;
			}
			EXPORT_SYMBOL(get_wchan);

	EXPORT_SYMBOL(dump_stack);		static int kstack_depth_to_print = 64;

	void show_stack(struct task_struct tsk, unsigned long stack)		void show_stack(struct task_struct tsk, unsigned long stack)
	{		{
	unsigned long sp, stack_top, prev_sp, ret;		unsigned long sp, ip, lr, newsp;
	int count = 0;		int count = 0;
	unsigned long next_exc = 0;		int firstframe = 1;
	struct pt_regs *regs;
	extern char ret_from_except, ret_from_except_full, ret_from_syscall;

	sp = (unsigned long) stack;		sp = (unsigned long) stack;
	if (tsk == NULL)		if (tsk == NULL)
	@@ -669,65 +871,45 @@ void show_stack(struct task_struct tsk, unsigned long stack)
	sp = tsk->thread.ksp;		sp = tsk->thread.ksp;
	}		}

	prev_sp = (unsigned long) (tsk->thread_info + 1);		lr = 0;
	stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;		printk("Call Trace:\n");
	while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {		do {
	if (count == 0) {		if (!validate_sp(sp, tsk, MIN_STACK_FRAME))
	printk("Call trace:");		return;
	#ifdef CONFIG_KALLSYMS
	printk("\n");		stack = (unsigned long *) sp;
	#endif		newsp = stack[0];
	} else {		ip = stack[FRAME_LR_SAVE];
	if (next_exc) {		if (!firstframe \|\| ip != lr) {
	ret = next_exc;		printk("["REG"] ["REG"] ", sp, ip);
	next_exc = 0;		print_symbol("%s", ip);
	} else		if (firstframe)
	ret = (unsigned long )(sp + 4);		printk(" (unreliable)");
	printk(" [%08lx] ", ret);
	#ifdef CONFIG_KALLSYMS
	print_symbol("%s", ret);
	printk("\n");		printk("\n");
	#endif
	if (ret == (unsigned long) &ret_from_except
	\|\| ret == (unsigned long) &ret_from_except_full
	\|\| ret == (unsigned long) &ret_from_syscall) {
	/* sp + 16 points to an exception frame */
	regs = (struct pt_regs *) (sp + 16);
	if (sp + 16 + sizeof(*regs) <= stack_top)
	next_exc = regs->nip;
	}
	}		}
	++count;		firstframe = 0;
	sp = (unsigned long )sp;
			/*
			* See if this is an exception frame.
			* We look for the "regshere" marker in the current frame.
			*/
			if (validate_sp(sp, tsk, INT_FRAME_SIZE)
			&& stack[FRAME_MARKER] == REGS_MARKER) {
			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;
	}		}
	#ifndef CONFIG_KALLSYMS
	if (count > 0)		sp = newsp;
	printk("\n");		} while (count++ < kstack_depth_to_print);
	#endif
	}		}

	unsigned long get_wchan(struct task_struct *p)		void dump_stack(void)
	{		{
	unsigned long ip, sp;		show_stack(current, NULL);
	int count = 0;

	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	return 0;

	sp = p->thread.ksp;
	if (!validate_sp(sp, p, 16))
	return 0;

	do {
	sp = (unsigned long )sp;
	if (!validate_sp(sp, p, 16))
	return 0;
	if (count > 0) {
	ip = (unsigned long )(sp + 4);
	if (!in_sched_functions(ip))
	return ip;
	}
	} while (count++ < 16);
	return 0;
	}		}
	EXPORT_SYMBOL(get_wchan);		EXPORT_SYMBOL(dump_stack);

include/asm-powerpc/elf.h

+2 −4

Original line number	Original line	Diff line number	Diff line
	@@ -215,8 +215,6 @@ extern int dump_task_fpu(struct task_struct , elf_fpregset_t );
	# define ELF_HWCAP (cur_cpu_spec->cpu_user_features)		# define ELF_HWCAP (cur_cpu_spec->cpu_user_features)
	#ifdef __powerpc64__		#ifdef __powerpc64__
	# define ELF_PLAT_INIT(_r, load_addr) do { \		# define ELF_PLAT_INIT(_r, load_addr) do { \
	memset(_r->gpr, 0, sizeof(_r->gpr)); \
	_r->ctr = _r->link = _r->xer = _r->ccr = 0; \
	_r->gpr[2] = load_addr; \		_r->gpr[2] = load_addr; \
	} while (0)		} while (0)
	#endif /* __powerpc64__ */		#endif /* __powerpc64__ */