X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fum%2Fkernel%2Fprocess.c;h=0eae00b3e58895054d69afd0876bedae0bd12631;hb=bb40784f4aeae7b9d70c49b422f78ffdfc539739;hp=348b272bb766a5305f54ba3d35874b5b3caa45e6;hpb=71fa0a849b384f066dea6a2351c722c19846f4ac;p=linux-2.6 diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c index 348b272bb7..0eae00b3e5 100644 --- a/arch/um/kernel/process.c +++ b/arch/um/kernel/process.c @@ -1,74 +1,50 @@ /* - * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright 2003 PathScale, Inc. * Licensed under the GPL */ -#include "linux/kernel.h" -#include "linux/sched.h" -#include "linux/interrupt.h" -#include "linux/string.h" +#include "linux/stddef.h" +#include "linux/err.h" +#include "linux/hardirq.h" #include "linux/mm.h" -#include "linux/slab.h" -#include "linux/utsname.h" -#include "linux/fs.h" -#include "linux/utime.h" -#include "linux/smp_lock.h" -#include "linux/module.h" -#include "linux/init.h" -#include "linux/capability.h" -#include "linux/vmalloc.h" -#include "linux/spinlock.h" +#include "linux/personality.h" #include "linux/proc_fs.h" #include "linux/ptrace.h" #include "linux/random.h" -#include "linux/personality.h" -#include "asm/unistd.h" -#include "asm/mman.h" -#include "asm/segment.h" -#include "asm/stat.h" +#include "linux/sched.h" +#include "linux/tick.h" +#include "linux/threads.h" #include "asm/pgtable.h" -#include "asm/processor.h" -#include "asm/tlbflush.h" #include "asm/uaccess.h" -#include "asm/user.h" -#include "user_util.h" +#include "as-layout.h" #include "kern_util.h" -#include "kern.h" -#include "signal_kern.h" -#include "init.h" -#include "irq_user.h" -#include "mem_user.h" -#include "tlb.h" -#include "frame_kern.h" -#include "sigcontext.h" #include "os.h" -#include "mode.h" -#include "mode_kern.h" -#include "choose-mode.h" -#include "um_malloc.h" +#include "skas.h" +#include "tlb.h" -/* This is a per-cpu array. A processor only modifies its entry and it only +/* + * This is a per-cpu array. A processor only modifies its entry and it only * cares about its entry, so it's OK if another processor is modifying its * entry. */ struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } }; -int external_pid(void *t) +static inline int external_pid(struct task_struct *task) { - struct task_struct *task = t ? t : current; - - return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task)); + /* FIXME: Need to look up userspace_pid by cpu */ + return userspace_pid[0]; } int pid_to_processor_id(int pid) { int i; - for(i = 0; i < ncpus; i++){ - if(cpu_tasks[i].pid == pid) return(i); + for(i = 0; i < ncpus; i++) { + if (cpu_tasks[i].pid == pid) + return i; } - return(-1); + return -1; } void free_stack(unsigned long stack, int order) @@ -84,10 +60,10 @@ unsigned long alloc_stack(int order, int atomic) if (atomic) flags = GFP_ATOMIC; page = __get_free_pages(flags, order); - if(page == 0) - return(0); - stack_protections(page); - return(page); + if (page == 0) + return 0; + + return page; } int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) @@ -98,19 +74,17 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) current->thread.request.u.thread.arg = arg; pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0, ¤t->thread.regs, 0, NULL, NULL); - if(pid < 0) - panic("do_fork failed in kernel_thread, errno = %d", pid); - return(pid); + return pid; } -void set_current(void *t) +static inline void set_current(struct task_struct *task) { - struct task_struct *task = t; - cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) { external_pid(task), task }); } +extern void arch_switch_to(struct task_struct *from, struct task_struct *to); + void *_switch_to(void *prev, void *next, void *last) { struct task_struct *from = prev; @@ -120,61 +94,133 @@ void *_switch_to(void *prev, void *next, void *last) set_current(to); do { - current->thread.saved_task = NULL ; - CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next); - if(current->thread.saved_task) + current->thread.saved_task = NULL; + + switch_threads(&from->thread.switch_buf, + &to->thread.switch_buf); + + arch_switch_to(current->thread.prev_sched, current); + + if (current->thread.saved_task) show_regs(&(current->thread.regs)); next= current->thread.saved_task; prev= current; } while(current->thread.saved_task); - return(current->thread.prev_sched); + return current->thread.prev_sched; } void interrupt_end(void) { - if(need_resched()) schedule(); - if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal(); + if (need_resched()) + schedule(); + if (test_tsk_thread_flag(current, TIF_SIGPENDING)) + do_signal(); } -void release_thread(struct task_struct *task) +void exit_thread(void) { - CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task)); } -void exit_thread(void) +void *get_current(void) { - unprotect_stack((unsigned long) current_thread); + return current; } -void *get_current(void) +extern void schedule_tail(struct task_struct *prev); + +/* + * This is called magically, by its address being stuffed in a jmp_buf + * and being longjmp-d to. + */ +void new_thread_handler(void) { - return(current); + int (*fn)(void *), n; + void *arg; + + if (current->thread.prev_sched != NULL) + schedule_tail(current->thread.prev_sched); + current->thread.prev_sched = NULL; + + fn = current->thread.request.u.thread.proc; + arg = current->thread.request.u.thread.arg; + + /* + * The return value is 1 if the kernel thread execs a process, + * 0 if it just exits + */ + n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf); + if (n == 1) { + /* Handle any immediate reschedules or signals */ + interrupt_end(); + userspace(¤t->thread.regs.regs); + } + else do_exit(0); +} + +/* Called magically, see new_thread_handler above */ +void fork_handler(void) +{ + force_flush_all(); + if (current->thread.prev_sched == NULL) + panic("blech"); + + schedule_tail(current->thread.prev_sched); + + /* + * XXX: if interrupt_end() calls schedule, this call to + * arch_switch_to isn't needed. We could want to apply this to + * improve performance. -bb + */ + arch_switch_to(current->thread.prev_sched, current); + + current->thread.prev_sched = NULL; + + /* Handle any immediate reschedules or signals */ + interrupt_end(); + + userspace(¤t->thread.regs.regs); } int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, unsigned long stack_top, struct task_struct * p, struct pt_regs *regs) { - int ret; + void (*handler)(void); + int ret = 0; p->thread = (struct thread_struct) INIT_THREAD; - ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr, - clone_flags, sp, stack_top, p, regs); - if (ret || !current->thread.forking) - goto out; + if (current->thread.forking) { + memcpy(&p->thread.regs.regs, ®s->regs, + sizeof(p->thread.regs.regs)); + REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.gp, 0); + if (sp != 0) + REGS_SP(p->thread.regs.regs.gp) = sp; - clear_flushed_tls(p); + handler = fork_handler; - /* - * Set a new TLS for the child thread? - */ - if (clone_flags & CLONE_SETTLS) - ret = arch_copy_tls(p); + arch_copy_thread(¤t->thread.arch, &p->thread.arch); + } + else { + init_thread_registers(&p->thread.regs.regs); + p->thread.request.u.thread = current->thread.request.u.thread; + handler = new_thread_handler; + } + + new_thread(task_stack_page(p), &p->thread.switch_buf, handler); + + if (current->thread.forking) { + clear_flushed_tls(p); + + /* + * Set a new TLS for the child thread? + */ + if (clone_flags & CLONE_SETTLS) + ret = arch_copy_tls(p); + } -out: return ret; } @@ -183,47 +229,35 @@ void initial_thread_cb(void (*proc)(void *), void *arg) int save_kmalloc_ok = kmalloc_ok; kmalloc_ok = 0; - CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc, - arg); + initial_thread_cb_skas(proc, arg); kmalloc_ok = save_kmalloc_ok; } -unsigned long stack_sp(unsigned long page) -{ - return(page + PAGE_SIZE - sizeof(void *)); -} - -int current_pid(void) -{ - return(current->pid); -} - void default_idle(void) { - CHOOSE_MODE(uml_idle_timer(), (void) 0); + unsigned long long nsecs; - while(1){ + while(1) { /* endless idle loop with no priority at all */ /* * although we are an idle CPU, we do not want to * get into the scheduler unnecessarily. */ - if(need_resched()) + if (need_resched()) schedule(); - idle_sleep(10); + tick_nohz_stop_sched_tick(); + nsecs = disable_timer(); + idle_sleep(nsecs); + tick_nohz_restart_sched_tick(); } } void cpu_idle(void) { - CHOOSE_MODE(init_idle_tt(), init_idle_skas()); -} - -int page_size(void) -{ - return(PAGE_SIZE); + cpu_tasks[current_thread->cpu].pid = os_getpid(); + default_idle(); } void *um_virt_to_phys(struct task_struct *task, unsigned long addr, @@ -235,114 +269,55 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr, pte_t *pte; pte_t ptent; - if(task->mm == NULL) - return(ERR_PTR(-EINVAL)); + if (task->mm == NULL) + return ERR_PTR(-EINVAL); pgd = pgd_offset(task->mm, addr); - if(!pgd_present(*pgd)) - return(ERR_PTR(-EINVAL)); + if (!pgd_present(*pgd)) + return ERR_PTR(-EINVAL); pud = pud_offset(pgd, addr); - if(!pud_present(*pud)) - return(ERR_PTR(-EINVAL)); + if (!pud_present(*pud)) + return ERR_PTR(-EINVAL); pmd = pmd_offset(pud, addr); - if(!pmd_present(*pmd)) - return(ERR_PTR(-EINVAL)); + if (!pmd_present(*pmd)) + return ERR_PTR(-EINVAL); pte = pte_offset_kernel(pmd, addr); ptent = *pte; - if(!pte_present(ptent)) - return(ERR_PTR(-EINVAL)); + if (!pte_present(ptent)) + return ERR_PTR(-EINVAL); - if(pte_out != NULL) + if (pte_out != NULL) *pte_out = ptent; - return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK)); + return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK); } char *current_cmd(void) { #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM) - return("(Unknown)"); + return "(Unknown)"; #else void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL); return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr); #endif } -void force_sigbus(void) -{ - printk(KERN_ERR "Killing pid %d because of a lack of memory\n", - current->pid); - lock_kernel(); - sigaddset(¤t->pending.signal, SIGBUS); - recalc_sigpending(); - current->flags |= PF_SIGNALED; - do_exit(SIGBUS | 0x80); -} - void dump_thread(struct pt_regs *regs, struct user *u) { } -void enable_hlt(void) -{ - panic("enable_hlt"); -} - -EXPORT_SYMBOL(enable_hlt); - -void disable_hlt(void) -{ - panic("disable_hlt"); -} - -EXPORT_SYMBOL(disable_hlt); - -void *um_kmalloc(int size) -{ - return kmalloc(size, GFP_KERNEL); -} - -void *um_kmalloc_atomic(int size) -{ - return kmalloc(size, GFP_ATOMIC); -} - -void *um_vmalloc(int size) -{ - return vmalloc(size); -} - -void *um_vmalloc_atomic(int size) -{ - return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL); -} - int __cant_sleep(void) { return in_atomic() || irqs_disabled() || in_interrupt(); /* Is in_interrupt() really needed? */ } -unsigned long get_fault_addr(void) -{ - return((unsigned long) current->thread.fault_addr); -} - -EXPORT_SYMBOL(get_fault_addr); - -void not_implemented(void) -{ - printk(KERN_DEBUG "Something isn't implemented in here\n"); -} - -EXPORT_SYMBOL(not_implemented); - int user_context(unsigned long sp) { unsigned long stack; stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); - return(stack != (unsigned long) current_thread); + return stack != (unsigned long) current_thread; } extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; @@ -363,22 +338,22 @@ char *uml_strdup(char *string) int copy_to_user_proc(void __user *to, void *from, int size) { - return(copy_to_user(to, from, size)); + return copy_to_user(to, from, size); } int copy_from_user_proc(void *to, void __user *from, int size) { - return(copy_from_user(to, from, size)); + return copy_from_user(to, from, size); } int clear_user_proc(void __user *buf, int size) { - return(clear_user(buf, size)); + return clear_user(buf, size); } int strlen_user_proc(char __user *str) { - return(strlen_user(str)); + return strlen_user(str); } int smp_sigio_handler(void) @@ -386,15 +361,15 @@ int smp_sigio_handler(void) #ifdef CONFIG_SMP int cpu = current_thread->cpu; IPI_handler(cpu); - if(cpu != 0) - return(1); + if (cpu != 0) + return 1; #endif - return(0); + return 0; } int cpu(void) { - return(current_thread->cpu); + return current_thread->cpu; } static atomic_t using_sysemu = ATOMIC_INIT(0); @@ -414,7 +389,8 @@ int get_using_sysemu(void) static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data) { - if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/ + if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) + /* No overflow */ *eof = 1; return strlen(buf); @@ -429,7 +405,8 @@ static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned if (tmp[0] >= '0' && tmp[0] <= '2') set_using_sysemu(tmp[0] - '0'); - return count; /*We use the first char, but pretend to write everything*/ + /* We use the first char, but pretend to write everything */ + return count; } int __init make_proc_sysemu(void) @@ -443,7 +420,7 @@ int __init make_proc_sysemu(void) if (ent == NULL) { printk(KERN_WARNING "Failed to register /proc/sysemu\n"); - return(0); + return 0; } ent->read_proc = proc_read_sysemu; @@ -459,10 +436,10 @@ int singlestepping(void * t) struct task_struct *task = t ? t : current; if ( ! (task->ptrace & PT_DTRACE) ) - return(0); + return 0; if (task->thread.singlestep_syscall) - return(1); + return 1; return 2; }