powerpc: make ARCH=ppc use arch/powerpc/kernel/process.c

624cee31 · Paul Mackerras <[email protected]> · 2006-01-12 21:22:34 +11:00

Commit 5388fb1025443ec223ba556b10efc4c5f83f8682 made signal_32.c
use discard_lazy_cpu_state, which broke ARCH=ppc because that
uses the common signal_32.c but has its own process.c.  Make ARCH=ppc
use the common process.c to fix this and to reduce the amount
of duplicated code.

Signed-off-by: Paul Mackerras <[email protected]>

Commit: 624cee31bcb14bfd85559fbec5dd7bb833542965
Parents: 8fce10a3

Changes

5 files changed · +15 −857

File	Status	Add	Del	Content
arch/powerpc/kernel/Makefile	modified	+3	−3	View file
arch/powerpc/kernel/process.c	modified	+2	−0	View file
arch/ppc/kernel/Makefile	modified	+0	−1	View file
arch/ppc/kernel/process.c	deleted	+0	−851	View before deletion
include/asm-ppc/system.h	modified	+10	−2	View file

Only the first 600 diff lines are shown. Download the complete patch.

arch/powerpc/kernel/Makefile

View file

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index bbfa1bd..a94699d 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -11,7 +11,8 @@ CFLAGS_btext.o		+= -fPIC
 endif
 
 obj-y				:= semaphore.o cputable.o ptrace.o syscalls.o \
-				   irq.o align.o signal_32.o pmc.o vdso.o
+				   irq.o align.o signal_32.o pmc.o vdso.o \
+				   init_task.o process.o
 obj-y				+= vdso32/
 obj-$(CONFIG_PPC64)		+= setup_64.o binfmt_elf32.o sys_ppc32.o \
 				   signal_64.o ptrace32.o systbl.o \
@@ -44,8 +45,7 @@ extra-$(CONFIG_FSL_BOOKE)	:= head_fsl_booke.o
 extra-$(CONFIG_8xx)		:= head_8xx.o
 extra-y				+= vmlinux.lds
 
-obj-y				+= process.o init_task.o time.o \
-				   prom.o traps.o setup-common.o udbg.o
+obj-y				+= time.o prom.o traps.o setup-common.o udbg.o
 obj-$(CONFIG_PPC32)		+= entry_32.o setup_32.o misc_32.o systbl.o
 obj-$(CONFIG_PPC64)		+= misc_64.o dma_64.o iommu.o
 obj-$(CONFIG_PPC_MULTIPLATFORM)	+= prom_init.o

arch/powerpc/kernel/process.c

View file

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 913f906..9101358 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -223,6 +223,7 @@ void discard_lazy_cpu_state(void)
 }
 #endif /* CONFIG_SMP */
 
+#ifdef CONFIG_PPC_MERGE		/* XXX for now */
 int set_dabr(unsigned long dabr)
 {
 	if (ppc_md.set_dabr)
@@ -231,6 +232,7 @@ int set_dabr(unsigned long dabr)
 	mtspr(SPRN_DABR, dabr);
 	return 0;
 }
+#endif
 
 #ifdef CONFIG_PPC64
 DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);

arch/ppc/kernel/Makefile

View file

diff --git a/arch/ppc/kernel/Makefile b/arch/ppc/kernel/Makefile
index e6c1d61..ca02013 100644
--- a/arch/ppc/kernel/Makefile
+++ b/arch/ppc/kernel/Makefile
@@ -13,7 +13,6 @@ extra-$(CONFIG_POWER4)		+= idle_power4.o
 extra-y				+= vmlinux.lds
 
 obj-y				:= entry.o traps.o idle.o time.o misc.o \
-					process.o \
 					setup.o \
 					ppc_htab.o
 obj-$(CONFIG_6xx)		+= l2cr.o cpu_setup_6xx.o

arch/ppc/kernel/process.c

View before deletion

diff --git a/arch/ppc/kernel/process.c b/arch/ppc/kernel/process.c
deleted file mode 100644
index 25cbdc8..0000000
--- a/arch/ppc/kernel/process.c
+++ /dev/null
@@ -1,851 +0,0 @@
-/*
- *  arch/ppc/kernel/process.c
- *
- *  Derived from "arch/i386/kernel/process.c"
- *    Copyright (C) 1995  Linus Torvalds
- *
- *  Updated and modified by Cort Dougan ([email protected]) and
- *  Paul Mackerras ([email protected])
- *
- *  PowerPC version
- *    Copyright (C) 1995-1996 Gary Thomas ([email protected])
- *
- *  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/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/ptrace.h>
-#include <linux/slab.h>
-#include <linux/user.h>
-#include <linux/elf.h>
-#include <linux/init.h>
-#include <linux/prctl.h>
-#include <linux/init_task.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/mqueue.h>
-#include <linux/hardirq.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/prom.h>
-
-extern unsigned long _get_SP(void);
-
-struct task_struct *last_task_used_math = NULL;
-struct task_struct *last_task_used_altivec = NULL;
-struct task_struct *last_task_used_spe = NULL;
-
-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, };
-
-#undef SHOW_TASK_SWITCHES
-#undef CHECK_STACK
-
-#if defined(CHECK_STACK)
-unsigned long
-kernel_stack_top(struct task_struct *tsk)
-{
-	return ((unsigned long)tsk) + sizeof(union task_union);
-}
-
-unsigned long
-task_top(struct task_struct *tsk)
-{
-	return ((unsigned long)tsk) + sizeof(struct thread_info);
-}
-
-/* check to make sure the kernel stack is healthy */
-int check_stack(struct task_struct *tsk)
-{
-	unsigned long stack_top = kernel_stack_top(tsk);
-	unsigned long tsk_top = task_top(tsk);
-	int ret = 0;
-
-#if 0
-	/* check thread magic */
-	if ( tsk->thread.magic != THREAD_MAGIC )
-	{
-		ret |= 1;
-		printk("thread.magic bad: %08x\n", tsk->thread.magic);
-	}
-#endif
-
-	if ( !tsk )
-		printk("check_stack(): tsk bad tsk %p\n",tsk);
-
-	/* check if stored ksp is bad */
-	if ( (tsk->thread.ksp > stack_top) || (tsk->thread.ksp < tsk_top) )
-	{
-		printk("stack out of bounds: %s/%d\n"
-		       " tsk_top %08lx ksp %08lx stack_top %08lx\n",
-		       tsk->comm,tsk->pid,
-		       tsk_top, tsk->thread.ksp, stack_top);
-		ret |= 2;
-	}
-
-	/* check if stack ptr RIGHT NOW is bad */
-	if ( (tsk == current) && ((_get_SP() > stack_top ) || (_get_SP() < tsk_top)) )
-	{
-		printk("current stack ptr out of bounds: %s/%d\n"
-		       " tsk_top %08lx sp %08lx stack_top %08lx\n",
-		       current->comm,current->pid,
-		       tsk_top, _get_SP(), stack_top);
-		ret |= 4;
-	}
-
-#if 0
-	/* check amount of free stack */
-	for ( i = (unsigned long *)task_top(tsk) ; i < kernel_stack_top(tsk) ; i++ )
-	{
-		if ( !i )
-			printk("check_stack(): i = %p\n", i);
-		if ( *i != 0 )
-		{
-			/* only notify if it's less than 900 bytes */
-			if ( (i - (unsigned long *)task_top(tsk))  < 900 )
-				printk("%d bytes free on stack\n",
-				       i - task_top(tsk));
-			break;
-		}
-	}
-#endif
-
-	if (ret)
-	{
-		panic("bad kernel stack");
-	}
-	return(ret);
-}
-#endif /* defined(CHECK_STACK) */
-
-/*
- * 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)
-{
-	preempt_disable();
-	if (tsk->thread.regs && (tsk->thread.regs->msr & MSR_FP))
-		giveup_fpu(tsk);
-	preempt_enable();
-	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 enable AltiVec for kernel - force */
-#else
-	giveup_altivec(last_task_used_altivec);
-#endif /* __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_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
-{
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-	memcpy(vrregs, &current->thread.vr[0], sizeof(*vrregs));
-	return 1;
-}
-#endif /* CONFIG_ALTIVEC */
-
-#ifdef CONFIG_SPE
-void
-enable_kernel_spe(void)
-{
-	WARN_ON(preemptible());
-
-#ifdef CONFIG_SMP
-	if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
-		giveup_spe(current);
-	else
-		giveup_spe(NULL);	/* just enable SPE for kernel - force */
-#else
-	giveup_spe(last_task_used_spe);
-#endif /* __SMP __ */
-}
-EXPORT_SYMBOL(enable_kernel_spe);
-
-void flush_spe_to_thread(struct task_struct *tsk)
-{
-	if (tsk->thread.regs) {
-		preempt_disable();
-		if (tsk->thread.regs->msr & MSR_SPE) {
-#ifdef CONFIG_SMP
-			BUG_ON(tsk != current);
-#endif
-			giveup_spe(current);
-		}
-		preempt_enable();
-	}
-}
-
-int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
-{
-	if (regs->msr & MSR_SPE)
-		giveup_spe(current);
-	/* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
-	memcpy(evrregs, &current->thread.evr[0], sizeof(u32) * 35);
-	return 1;
-}
-#endif /* CONFIG_SPE */
-
-struct task_struct *__switch_to(struct task_struct *prev,
-	struct task_struct *new)
-{
-	struct thread_struct *new_thread, *old_thread;
-	unsigned long s;
-	struct task_struct *last;
-
-	local_irq_save(s);
-#ifdef CHECK_STACK
-	check_stack(prev);
-	check_stack(new);
-#endif
-
-#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 the previous thread used altivec in the last quantum
-	 * (thus changing altivec regs) then save them.
-	 * We used to check the VRSAVE register but not all apps
-	 * set it, so we don't rely on it now (and in fact we need
-	 * to save & restore VSCR even if VRSAVE == 0).  -- paulus
-	 *
-	 * On SMP we always save/restore altivec regs just to avoid the
-	 * complexity of changing processors.
-	 *  -- Cort
-	 */
-	if ((prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)))
-		giveup_altivec(prev);
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
-	/*
-	 * If the previous thread used spe in the last quantum
-	 * (thus changing spe regs) then save them.
-	 *
-	 * On SMP we always save/restore spe regs just to avoid the
-	 * complexity of changing processors.
-	 */
-	if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
-		giveup_spe(prev);
-#endif /* CONFIG_SPE */
-#endif /* CONFIG_SMP */
-
-#ifdef CONFIG_ALTIVEC
-	/* 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
-#ifdef CONFIG_SPE
-	/* Avoid the trap.  On smp this this never happens since
-	 * we don't set last_task_used_spe
-	 */
-	if (new->thread.regs && last_task_used_spe == new)
-		new->thread.regs->msr |= MSR_SPE;
-#endif /* CONFIG_SPE */
-	new_thread = &new->thread;
-	old_thread = &current->thread;
-	last = _switch(old_thread, new_thread);
-	local_irq_restore(s);
-	return last;
-}
-
-void show_regs(struct pt_regs * regs)
-{
-	int i, trap;
-
-	printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx    %s\n",
-	       regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
-	       print_tainted());
-	printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\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);
-	trap = TRAP(regs);
-	if (trap == 0x300 || trap == 0x600)
-		printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
-	printk("TASK = %p[%d] '%s' THREAD: %p\n",
-	       current, current->pid, current->comm, current->thread_info);
-	printk("Last syscall: %ld ", current->thread.last_syscall);
-
-#ifdef CONFIG_SMP
-	printk(" CPU: %d", smp_processor_id());
-#endif /* CONFIG_SMP */
-
-	for (i = 0;  i < 32;  i++) {
-		long r;
-		if ((i % 8) == 0)
-			printk("\n" KERN_INFO "GPR%02d: ", i);
-		if (__get_user(r, &regs->gpr[i]))
-			break;
-		printk("%08lX ", r);
-		if (i == 12 && !FULL_REGS(regs))
-			break;
-	}
-	printk("\n");
-#ifdef CONFIG_KALLSYMS
-	/*
-	 * Lookup NIP late so we have the best change of getting the
-	 * above info out without failing
-	 */
-	printk("NIP [%08lx] ", regs->nip);
-	print_symbol("%s\n", regs->nip);
-	printk("LR [%08lx] ", regs->link);
-	print_symbol("%s\n", regs->link);
-#endif
-	show_stack(current, (unsigned long *) regs->gpr[1]);
-}
-
-void exit_thread(void)
-{
-	preempt_disable();
-	if (last_task_used_math == current)
-		last_task_used_math = NULL;
-	if (last_task_used_altivec == current)
-		last_task_used_altivec = NULL;
-#ifdef CONFIG_SPE
-	if (last_task_used_spe == current)
-		last_task_used_spe = NULL;
-#endif
-	preempt_enable();
-}
-
-void flush_thread(void)
-{
-	preempt_disable();
-	if (last_task_used_math == current)
-		last_task_used_math = NULL;
-	if (last_task_used_altivec == current)
-		last_task_used_altivec = NULL;
-#ifdef CONFIG_SPE
-	if (last_task_used_spe == current)
-		last_task_used_spe = NULL;
-#endif
-	preempt_enable();
-}
-
-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)
-{
-	struct pt_regs *regs = tsk->thread.regs;
-
-	if (regs == NULL)
-		return;
-	preempt_disable();
-	if (regs->msr & MSR_FP)
-		giveup_fpu(current);
-#ifdef CONFIG_ALTIVEC
-	if (regs->msr & MSR_VEC)
-		giveup_altivec(current);
-#endif /* CONFIG_ALTIVEC */
-#ifdef CONFIG_SPE
-	if (regs->msr & MSR_SPE)
-		giveup_spe(current);
-#endif /* CONFIG_SPE */
-	preempt_enable();
-}
-
-/*
- * 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;
-	unsigned long childframe;
-
-	CHECK_FULL_REGS(regs);
-	/* Copy registers */
-	sp -= sizeof(struct pt_regs);
-	childregs = (struct pt_regs *) sp;
-	*childregs = *regs;
-	if ((childregs->msr & MSR_PR) == 0) {
-		/* for kernel thread, set `current' and stackptr in new task */
-		childregs->gpr[1] = sp + sizeof(struct pt_regs);
-		childregs->gpr[2] = (unsigned long) p;
-		p->thread.regs = NULL;	/* no user register state */
-	} else {
-		childregs->gpr[1] = usp;
-		p->thread.regs = childregs;
-		if (clone_flags & CLONE_SETTLS)
-			childregs->gpr[2] = childregs->gpr[6];
-	}
-	childregs->gpr[3] = 0;  /* Result from fork() */
-	sp -= STACK_FRAME_OVERHEAD;
-	childframe = sp;
-
-	/*
-	 * 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;
-	kregs->nip = (unsigned long)ret_from_fork;
-
-	p->thread.last_syscall = -1;
-
-	return 0;
-}
-
-/*
- * Set up a thread for executing a new program
- */
-void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp)
-{
-	set_fs(USER_DS);
-	memset(regs->gpr, 0, sizeof(regs->gpr));
-	regs->ctr = 0;
-	regs->link = 0;
-	regs->xer = 0;
-	regs->ccr = 0;
-	regs->mq = 0;

This diff is incomplete. Download the complete patch.

include/asm-ppc/system.h

View file

This diff is incomplete. Download the complete patch.