powerpc: make ARCH=ppc use arch/powerpc/kernel/process.c
Commit 5388fb1025
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 <paulus@samba.org>
This commit is contained in:
parent
8fce10a3c9
commit
624cee31bc
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@ -11,7 +11,8 @@ CFLAGS_btext.o += -fPIC
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endif
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obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
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irq.o align.o signal_32.o pmc.o vdso.o
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irq.o align.o signal_32.o pmc.o vdso.o \
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init_task.o process.o
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obj-y += vdso32/
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obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
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signal_64.o ptrace32.o systbl.o \
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@ -44,8 +45,7 @@ extra-$(CONFIG_FSL_BOOKE) := head_fsl_booke.o
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extra-$(CONFIG_8xx) := head_8xx.o
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extra-y += vmlinux.lds
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obj-y += process.o init_task.o time.o \
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prom.o traps.o setup-common.o udbg.o
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obj-y += time.o prom.o traps.o setup-common.o udbg.o
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obj-$(CONFIG_PPC32) += entry_32.o setup_32.o misc_32.o systbl.o
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obj-$(CONFIG_PPC64) += misc_64.o dma_64.o iommu.o
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obj-$(CONFIG_PPC_MULTIPLATFORM) += prom_init.o
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@ -223,6 +223,7 @@ void discard_lazy_cpu_state(void)
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}
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_PPC_MERGE /* XXX for now */
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int set_dabr(unsigned long dabr)
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{
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if (ppc_md.set_dabr)
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@ -231,6 +232,7 @@ int set_dabr(unsigned long dabr)
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mtspr(SPRN_DABR, dabr);
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return 0;
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}
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#endif
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#ifdef CONFIG_PPC64
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DEFINE_PER_CPU(struct cpu_usage, cpu_usage_array);
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@ -13,7 +13,6 @@ extra-$(CONFIG_POWER4) += idle_power4.o
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extra-y += vmlinux.lds
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obj-y := entry.o traps.o idle.o time.o misc.o \
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process.o \
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setup.o \
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ppc_htab.o
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obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
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@ -1,851 +0,0 @@
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/*
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* arch/ppc/kernel/process.c
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*
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* Derived from "arch/i386/kernel/process.c"
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* Copyright (C) 1995 Linus Torvalds
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*
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* Updated and modified by Cort Dougan (cort@cs.nmt.edu) and
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* Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/config.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/elf.h>
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#include <linux/init.h>
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#include <linux/prctl.h>
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#include <linux/init_task.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/mqueue.h>
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#include <linux/hardirq.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/processor.h>
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#include <asm/mmu.h>
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#include <asm/prom.h>
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extern unsigned long _get_SP(void);
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struct task_struct *last_task_used_math = NULL;
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struct task_struct *last_task_used_altivec = NULL;
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struct task_struct *last_task_used_spe = NULL;
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static struct fs_struct init_fs = INIT_FS;
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static struct files_struct init_files = INIT_FILES;
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static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
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static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
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struct mm_struct init_mm = INIT_MM(init_mm);
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EXPORT_SYMBOL(init_mm);
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/* this is 8kB-aligned so we can get to the thread_info struct
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at the base of it from the stack pointer with 1 integer instruction. */
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union thread_union init_thread_union
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__attribute__((__section__(".data.init_task"))) =
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{ INIT_THREAD_INFO(init_task) };
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/* initial task structure */
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struct task_struct init_task = INIT_TASK(init_task);
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EXPORT_SYMBOL(init_task);
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/* only used to get secondary processor up */
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struct task_struct *current_set[NR_CPUS] = {&init_task, };
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#undef SHOW_TASK_SWITCHES
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#undef CHECK_STACK
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#if defined(CHECK_STACK)
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unsigned long
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kernel_stack_top(struct task_struct *tsk)
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{
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return ((unsigned long)tsk) + sizeof(union task_union);
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}
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unsigned long
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task_top(struct task_struct *tsk)
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{
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return ((unsigned long)tsk) + sizeof(struct thread_info);
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}
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/* check to make sure the kernel stack is healthy */
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int check_stack(struct task_struct *tsk)
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{
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unsigned long stack_top = kernel_stack_top(tsk);
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unsigned long tsk_top = task_top(tsk);
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int ret = 0;
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#if 0
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/* check thread magic */
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if ( tsk->thread.magic != THREAD_MAGIC )
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{
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ret |= 1;
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printk("thread.magic bad: %08x\n", tsk->thread.magic);
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}
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#endif
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if ( !tsk )
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printk("check_stack(): tsk bad tsk %p\n",tsk);
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/* check if stored ksp is bad */
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if ( (tsk->thread.ksp > stack_top) || (tsk->thread.ksp < tsk_top) )
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{
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printk("stack out of bounds: %s/%d\n"
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" tsk_top %08lx ksp %08lx stack_top %08lx\n",
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tsk->comm,tsk->pid,
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tsk_top, tsk->thread.ksp, stack_top);
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ret |= 2;
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}
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/* check if stack ptr RIGHT NOW is bad */
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if ( (tsk == current) && ((_get_SP() > stack_top ) || (_get_SP() < tsk_top)) )
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{
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printk("current stack ptr out of bounds: %s/%d\n"
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" tsk_top %08lx sp %08lx stack_top %08lx\n",
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current->comm,current->pid,
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tsk_top, _get_SP(), stack_top);
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ret |= 4;
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}
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#if 0
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/* check amount of free stack */
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for ( i = (unsigned long *)task_top(tsk) ; i < kernel_stack_top(tsk) ; i++ )
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{
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if ( !i )
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printk("check_stack(): i = %p\n", i);
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if ( *i != 0 )
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{
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/* only notify if it's less than 900 bytes */
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if ( (i - (unsigned long *)task_top(tsk)) < 900 )
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printk("%d bytes free on stack\n",
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i - task_top(tsk));
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break;
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}
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}
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#endif
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if (ret)
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{
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panic("bad kernel stack");
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}
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return(ret);
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}
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#endif /* defined(CHECK_STACK) */
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/*
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* Make sure the floating-point register state in the
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* the thread_struct is up to date for task tsk.
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*/
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void flush_fp_to_thread(struct task_struct *tsk)
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{
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if (tsk->thread.regs) {
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/*
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* We need to disable preemption here because if we didn't,
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* another process could get scheduled after the regs->msr
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* test but before we have finished saving the FP registers
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* to the thread_struct. That process could take over the
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* FPU, and then when we get scheduled again we would store
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* bogus values for the remaining FP registers.
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*/
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preempt_disable();
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if (tsk->thread.regs->msr & MSR_FP) {
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#ifdef CONFIG_SMP
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/*
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* This should only ever be called for current or
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* for a stopped child process. Since we save away
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* the FP register state on context switch on SMP,
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* there is something wrong if a stopped child appears
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* to still have its FP state in the CPU registers.
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*/
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BUG_ON(tsk != current);
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#endif
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giveup_fpu(current);
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}
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preempt_enable();
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}
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}
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void enable_kernel_fp(void)
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{
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WARN_ON(preemptible());
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#ifdef CONFIG_SMP
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if (current->thread.regs && (current->thread.regs->msr & MSR_FP))
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giveup_fpu(current);
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else
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giveup_fpu(NULL); /* just enables FP for kernel */
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#else
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giveup_fpu(last_task_used_math);
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#endif /* CONFIG_SMP */
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}
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EXPORT_SYMBOL(enable_kernel_fp);
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int dump_task_fpu(struct task_struct *tsk, elf_fpregset_t *fpregs)
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{
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preempt_disable();
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if (tsk->thread.regs && (tsk->thread.regs->msr & MSR_FP))
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giveup_fpu(tsk);
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preempt_enable();
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memcpy(fpregs, &tsk->thread.fpr[0], sizeof(*fpregs));
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return 1;
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}
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#ifdef CONFIG_ALTIVEC
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void enable_kernel_altivec(void)
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{
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WARN_ON(preemptible());
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#ifdef CONFIG_SMP
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if (current->thread.regs && (current->thread.regs->msr & MSR_VEC))
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giveup_altivec(current);
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else
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giveup_altivec(NULL); /* just enable AltiVec for kernel - force */
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#else
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giveup_altivec(last_task_used_altivec);
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#endif /* __SMP __ */
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}
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EXPORT_SYMBOL(enable_kernel_altivec);
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/*
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* Make sure the VMX/Altivec register state in the
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* the thread_struct is up to date for task tsk.
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*/
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void flush_altivec_to_thread(struct task_struct *tsk)
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{
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if (tsk->thread.regs) {
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preempt_disable();
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if (tsk->thread.regs->msr & MSR_VEC) {
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#ifdef CONFIG_SMP
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BUG_ON(tsk != current);
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#endif
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giveup_altivec(current);
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}
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preempt_enable();
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}
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}
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int dump_altivec(struct pt_regs *regs, elf_vrregset_t *vrregs)
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{
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if (regs->msr & MSR_VEC)
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giveup_altivec(current);
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memcpy(vrregs, ¤t->thread.vr[0], sizeof(*vrregs));
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return 1;
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}
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_SPE
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void
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enable_kernel_spe(void)
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{
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WARN_ON(preemptible());
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#ifdef CONFIG_SMP
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if (current->thread.regs && (current->thread.regs->msr & MSR_SPE))
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giveup_spe(current);
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else
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giveup_spe(NULL); /* just enable SPE for kernel - force */
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#else
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giveup_spe(last_task_used_spe);
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#endif /* __SMP __ */
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}
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EXPORT_SYMBOL(enable_kernel_spe);
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void flush_spe_to_thread(struct task_struct *tsk)
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{
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if (tsk->thread.regs) {
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preempt_disable();
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if (tsk->thread.regs->msr & MSR_SPE) {
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#ifdef CONFIG_SMP
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BUG_ON(tsk != current);
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#endif
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giveup_spe(current);
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}
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preempt_enable();
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}
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}
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int dump_spe(struct pt_regs *regs, elf_vrregset_t *evrregs)
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{
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if (regs->msr & MSR_SPE)
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giveup_spe(current);
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/* We copy u32 evr[32] + u64 acc + u32 spefscr -> 35 */
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memcpy(evrregs, ¤t->thread.evr[0], sizeof(u32) * 35);
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return 1;
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}
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#endif /* CONFIG_SPE */
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struct task_struct *__switch_to(struct task_struct *prev,
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struct task_struct *new)
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{
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struct thread_struct *new_thread, *old_thread;
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unsigned long s;
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struct task_struct *last;
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local_irq_save(s);
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#ifdef CHECK_STACK
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check_stack(prev);
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check_stack(new);
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#endif
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#ifdef CONFIG_SMP
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/* avoid complexity of lazy save/restore of fpu
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* by just saving it every time we switch out if
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* this task used the fpu during the last quantum.
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*
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* If it tries to use the fpu again, it'll trap and
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* reload its fp regs. So we don't have to do a restore
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* every switch, just a save.
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* -- Cort
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*/
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if (prev->thread.regs && (prev->thread.regs->msr & MSR_FP))
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giveup_fpu(prev);
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#ifdef CONFIG_ALTIVEC
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/*
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* If the previous thread used altivec in the last quantum
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* (thus changing altivec regs) then save them.
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* We used to check the VRSAVE register but not all apps
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* set it, so we don't rely on it now (and in fact we need
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* to save & restore VSCR even if VRSAVE == 0). -- paulus
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*
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* On SMP we always save/restore altivec regs just to avoid the
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* complexity of changing processors.
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* -- Cort
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*/
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if ((prev->thread.regs && (prev->thread.regs->msr & MSR_VEC)))
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giveup_altivec(prev);
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#endif /* CONFIG_ALTIVEC */
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#ifdef CONFIG_SPE
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/*
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* If the previous thread used spe in the last quantum
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* (thus changing spe regs) then save them.
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*
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* On SMP we always save/restore spe regs just to avoid the
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* complexity of changing processors.
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*/
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if ((prev->thread.regs && (prev->thread.regs->msr & MSR_SPE)))
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giveup_spe(prev);
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#endif /* CONFIG_SPE */
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#endif /* CONFIG_SMP */
|
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#ifdef CONFIG_ALTIVEC
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/* Avoid the trap. On smp this this never happens since
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* we don't set last_task_used_altivec -- Cort
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*/
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if (new->thread.regs && last_task_used_altivec == new)
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new->thread.regs->msr |= MSR_VEC;
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#endif
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#ifdef CONFIG_SPE
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/* Avoid the trap. On smp this this never happens since
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* we don't set last_task_used_spe
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*/
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if (new->thread.regs && last_task_used_spe == new)
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new->thread.regs->msr |= MSR_SPE;
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#endif /* CONFIG_SPE */
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new_thread = &new->thread;
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old_thread = ¤t->thread;
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last = _switch(old_thread, new_thread);
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local_irq_restore(s);
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return last;
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}
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|
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void show_regs(struct pt_regs * regs)
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{
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int i, trap;
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|
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printk("NIP: %08lX LR: %08lX SP: %08lX REGS: %p TRAP: %04lx %s\n",
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regs->nip, regs->link, regs->gpr[1], regs, regs->trap,
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print_tainted());
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printk("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
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regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
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regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
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regs->msr&MSR_IR ? 1 : 0,
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regs->msr&MSR_DR ? 1 : 0);
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trap = TRAP(regs);
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if (trap == 0x300 || trap == 0x600)
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printk("DAR: %08lX, DSISR: %08lX\n", regs->dar, regs->dsisr);
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printk("TASK = %p[%d] '%s' THREAD: %p\n",
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current, current->pid, current->comm, current->thread_info);
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printk("Last syscall: %ld ", current->thread.last_syscall);
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|
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#ifdef CONFIG_SMP
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printk(" CPU: %d", smp_processor_id());
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#endif /* CONFIG_SMP */
|
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|
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for (i = 0; i < 32; i++) {
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long r;
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if ((i % 8) == 0)
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printk("\n" KERN_INFO "GPR%02d: ", i);
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if (__get_user(r, ®s->gpr[i]))
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break;
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printk("%08lX ", r);
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if (i == 12 && !FULL_REGS(regs))
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||||
break;
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||||
}
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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;
|
||||
regs->nip = nip;
|
||||
regs->gpr[1] = sp;
|
||||
regs->msr = MSR_USER;
|
||||
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();
|
||||
memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
|
||||
current->thread.fpscr.val = 0;
|
||||
#ifdef CONFIG_ALTIVEC
|
||||
memset(current->thread.vr, 0, sizeof(current->thread.vr));
|
||||
memset(¤t->thread.vscr, 0, sizeof(current->thread.vscr));
|
||||
current->thread.vrsave = 0;
|
||||
current->thread.used_vr = 0;
|
||||
#endif /* CONFIG_ALTIVEC */
|
||||
#ifdef CONFIG_SPE
|
||||
memset(current->thread.evr, 0, sizeof(current->thread.evr));
|
||||
current->thread.acc = 0;
|
||||
current->thread.spefscr = 0;
|
||||
current->thread.used_spe = 0;
|
||||
#endif /* CONFIG_SPE */
|
||||
}
|
||||
|
||||
#define PR_FP_ALL_EXCEPT (PR_FP_EXC_DIV | PR_FP_EXC_OVF | PR_FP_EXC_UND \
|
||||
| PR_FP_EXC_RES | PR_FP_EXC_INV)
|
||||
|
||||
int set_fpexc_mode(struct task_struct *tsk, unsigned int val)
|
||||
{
|
||||
struct pt_regs *regs = tsk->thread.regs;
|
||||
|
||||
/* This is a bit hairy. If we are an SPE enabled processor
|
||||
* (have embedded fp) we store the IEEE exception enable flags in
|
||||
* fpexc_mode. fpexc_mode is also used for setting FP exception
|
||||
* mode (asyn, precise, disabled) for 'Classic' FP. */
|
||||
if (val & PR_FP_EXC_SW_ENABLE) {
|
||||
#ifdef CONFIG_SPE
|
||||
tsk->thread.fpexc_mode = val &
|
||||
(PR_FP_EXC_SW_ENABLE | PR_FP_ALL_EXCEPT);
|
||||
#else
|
||||
return -EINVAL;
|
||||
#endif
|
||||
} else {
|
||||
/* on a CONFIG_SPE this does not hurt us. The bits that
|
||||
* __pack_fe01 use do not overlap with bits used for
|
||||
* PR_FP_EXC_SW_ENABLE. Additionally, the MSR[FE0,FE1] bits
|
||||
* on CONFIG_SPE implementations are reserved so writing to
|
||||
* them does not change anything */
|
||||
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;
|
||||
|
||||
if (tsk->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
|
||||
#ifdef CONFIG_SPE
|
||||
val = tsk->thread.fpexc_mode;
|
||||
#else
|
||||
return -EINVAL;
|
||||
#endif
|
||||
else
|
||||
val = __unpack_fe01(tsk->thread.fpexc_mode);
|
||||
return put_user(val, (unsigned int __user *) adr);
|
||||
}
|
||||
|
||||
int sys_clone(unsigned long clone_flags, unsigned long usp,
|
||||
int __user *parent_tidp, void __user *child_threadptr,
|
||||
int __user *child_tidp, int p6,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
CHECK_FULL_REGS(regs);
|
||||
if (usp == 0)
|
||||
usp = regs->gpr[1]; /* stack pointer for child */
|
||||
return do_fork(clone_flags, usp, regs, 0, parent_tidp, child_tidp);
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
CHECK_FULL_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)
|
||||
{
|
||||
CHECK_FULL_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;
|
||||
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();
|
||||
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;
|
||||
}
|
||||
|
||||
void dump_stack(void)
|
||||
{
|
||||
show_stack(current, NULL);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(dump_stack);
|
||||
|
||||
void show_stack(struct task_struct *tsk, unsigned long *stack)
|
||||
{
|
||||
unsigned long sp, stack_top, prev_sp, ret;
|
||||
int count = 0;
|
||||
unsigned long next_exc = 0;
|
||||
struct pt_regs *regs;
|
||||
extern char ret_from_except, ret_from_except_full, ret_from_syscall;
|
||||
|
||||
sp = (unsigned long) stack;
|
||||
if (tsk == NULL)
|
||||
tsk = current;
|
||||
if (sp == 0) {
|
||||
if (tsk == current)
|
||||
asm("mr %0,1" : "=r" (sp));
|
||||
else
|
||||
sp = tsk->thread.ksp;
|
||||
}
|
||||
|
||||
prev_sp = (unsigned long) (tsk->thread_info + 1);
|
||||
stack_top = (unsigned long) tsk->thread_info + THREAD_SIZE;
|
||||
while (count < 16 && sp > prev_sp && sp < stack_top && (sp & 3) == 0) {
|
||||
if (count == 0) {
|
||||
printk("Call trace:");
|
||||
#ifdef CONFIG_KALLSYMS
|
||||
printk("\n");
|
||||
#endif
|
||||
} else {
|
||||
if (next_exc) {
|
||||
ret = next_exc;
|
||||
next_exc = 0;
|
||||
} else
|
||||
ret = *(unsigned long *)(sp + 4);
|
||||
printk(" [%08lx] ", ret);
|
||||
#ifdef CONFIG_KALLSYMS
|
||||
print_symbol("%s", ret);
|
||||
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;
|
||||
sp = *(unsigned long *)sp;
|
||||
}
|
||||
#ifndef CONFIG_KALLSYMS
|
||||
if (count > 0)
|
||||
printk("\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
#if 0
|
||||
/*
|
||||
* Low level print for debugging - Cort
|
||||
*/
|
||||
int __init ll_printk(const char *fmt, ...)
|
||||
{
|
||||
va_list args;
|
||||
char buf[256];
|
||||
int i;
|
||||
|
||||
va_start(args, fmt);
|
||||
i=vsprintf(buf,fmt,args);
|
||||
ll_puts(buf);
|
||||
va_end(args);
|
||||
return i;
|
||||
}
|
||||
|
||||
int lines = 24, cols = 80;
|
||||
int orig_x = 0, orig_y = 0;
|
||||
|
||||
void puthex(unsigned long val)
|
||||
{
|
||||
unsigned char buf[10];
|
||||
int i;
|
||||
for (i = 7; i >= 0; i--)
|
||||
{
|
||||
buf[i] = "0123456789ABCDEF"[val & 0x0F];
|
||||
val >>= 4;
|
||||
}
|
||||
buf[8] = '\0';
|
||||
prom_print(buf);
|
||||
}
|
||||
|
||||
void __init ll_puts(const char *s)
|
||||
{
|
||||
int x,y;
|
||||
char *vidmem = (char *)/*(_ISA_MEM_BASE + 0xB8000) */0xD00B8000;
|
||||
char c;
|
||||
extern int mem_init_done;
|
||||
|
||||
if ( mem_init_done ) /* assume this means we can printk */
|
||||
{
|
||||
printk(s);
|
||||
return;
|
||||
}
|
||||
|
||||
#if 0
|
||||
if ( have_of )
|
||||
{
|
||||
prom_print(s);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* can't ll_puts on chrp without openfirmware yet.
|
||||
* vidmem just needs to be setup for it.
|
||||
* -- Cort
|
||||
*/
|
||||
if ( _machine != _MACH_prep )
|
||||
return;
|
||||
x = orig_x;
|
||||
y = orig_y;
|
||||
|
||||
while ( ( c = *s++ ) != '\0' ) {
|
||||
if ( c == '\n' ) {
|
||||
x = 0;
|
||||
if ( ++y >= lines ) {
|
||||
/*scroll();*/
|
||||
/*y--;*/
|
||||
y = 0;
|
||||
}
|
||||
} else {
|
||||
vidmem [ ( x + cols * y ) * 2 ] = c;
|
||||
if ( ++x >= cols ) {
|
||||
x = 0;
|
||||
if ( ++y >= lines ) {
|
||||
/*scroll();*/
|
||||
/*y--;*/
|
||||
y = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
orig_x = x;
|
||||
orig_y = y;
|
||||
}
|
||||
#endif
|
||||
|
||||
unsigned long get_wchan(struct task_struct *p)
|
||||
{
|
||||
unsigned long ip, sp;
|
||||
unsigned long stack_page = (unsigned long) p->thread_info;
|
||||
int count = 0;
|
||||
if (!p || p == current || p->state == TASK_RUNNING)
|
||||
return 0;
|
||||
sp = p->thread.ksp;
|
||||
do {
|
||||
sp = *(unsigned long *)sp;
|
||||
if (sp < stack_page || sp >= stack_page + 8188)
|
||||
return 0;
|
||||
if (count > 0) {
|
||||
ip = *(unsigned long *)(sp + 4);
|
||||
if (!in_sched_functions(ip))
|
||||
return ip;
|
||||
}
|
||||
} while (count++ < 16);
|
||||
return 0;
|
||||
}
|
|
@ -4,7 +4,6 @@
|
|||
#ifndef __PPC_SYSTEM_H
|
||||
#define __PPC_SYSTEM_H
|
||||
|
||||
#include <linux/config.h>
|
||||
#include <linux/kernel.h>
|
||||
|
||||
#include <asm/atomic.h>
|
||||
|
@ -39,7 +38,7 @@
|
|||
#ifdef CONFIG_SMP
|
||||
#define smp_mb() mb()
|
||||
#define smp_rmb() rmb()
|
||||
#define smp_wmb() wmb()
|
||||
#define smp_wmb() __asm__ __volatile__ ("eieio" : : : "memory")
|
||||
#define smp_read_barrier_depends() read_barrier_depends()
|
||||
#else
|
||||
#define smp_mb() barrier()
|
||||
|
@ -74,6 +73,7 @@ extern void chrp_nvram_init(void);
|
|||
extern void read_rtc_time(void);
|
||||
extern void pmac_find_display(void);
|
||||
extern void giveup_fpu(struct task_struct *);
|
||||
extern void disable_kernel_fp(void);
|
||||
extern void enable_kernel_fp(void);
|
||||
extern void flush_fp_to_thread(struct task_struct *);
|
||||
extern void enable_kernel_altivec(void);
|
||||
|
@ -86,6 +86,14 @@ extern int fix_alignment(struct pt_regs *);
|
|||
extern void cvt_fd(float *from, double *to, struct thread_struct *thread);
|
||||
extern void cvt_df(double *from, float *to, struct thread_struct *thread);
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
extern void discard_lazy_cpu_state(void);
|
||||
#else
|
||||
static inline void discard_lazy_cpu_state(void)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_ALTIVEC
|
||||
extern void flush_altivec_to_thread(struct task_struct *);
|
||||
#else
|
||||
|
|
Loading…
Reference in New Issue