diff options
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/um/kernel/process.c (renamed from arch/um/kernel/process_kern.c) | 33 | ||||
| -rw-r--r-- | arch/um/kernel/skas/Makefile | 3 | ||||
| -rw-r--r-- | arch/um/kernel/skas/exec.c | 30 | ||||
| -rw-r--r-- | arch/um/kernel/skas/exec_kern.c | 41 | ||||
| -rw-r--r-- | arch/um/kernel/skas/process.c | 217 | ||||
| -rw-r--r-- | arch/um/kernel/skas/process_kern.c | 529 |
7 files changed, 663 insertions, 192 deletions
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile index a2d93065b2d..6fa63a2a89e 100644 --- a/arch/um/kernel/Makefile +++ b/arch/um/kernel/Makefile @@ -7,7 +7,7 @@ extra-y := vmlinux.lds clean-files := obj-y = config.o exec.o exitcode.o init_task.o irq.o ksyms.o mem.o \ - physmem.o process_kern.o ptrace.o reboot.o resource.o sigio.o \ + physmem.o process.o ptrace.o reboot.o resource.o sigio.o \ signal.o smp.o syscall.o sysrq.o time.o tlb.o trap.o uaccess.o \ um_arch.o umid.o diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process.c index 537895d68ad..fe6c64abda5 100644 --- a/arch/um/kernel/process_kern.c +++ b/arch/um/kernel/process.c @@ -1,10 +1,9 @@ -/* +/* * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Copyright 2003 PathScale, Inc. * Licensed under the GPL */ -#include "linux/config.h" #include "linux/kernel.h" #include "linux/sched.h" #include "linux/interrupt.h" @@ -113,11 +112,11 @@ void set_current(void *t) void *_switch_to(void *prev, void *next, void *last) { - struct task_struct *from = prev; - struct task_struct *to= next; + struct task_struct *from = prev; + struct task_struct *to= next; - to->thread.prev_sched = from; - set_current(to); + to->thread.prev_sched = from; + set_current(to); do { current->thread.saved_task = NULL ; @@ -128,7 +127,7 @@ void *_switch_to(void *prev, void *next, void *last) prev= current; } while(current->thread.saved_task); - return(current->thread.prev_sched); + return(current->thread.prev_sched); } @@ -142,19 +141,19 @@ void release_thread(struct task_struct *task) { CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task)); } - + void exit_thread(void) { unprotect_stack((unsigned long) current_thread); } - + void *get_current(void) { return(current); } int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, - unsigned long stack_top, struct task_struct * p, + unsigned long stack_top, struct task_struct * p, struct pt_regs *regs) { int ret; @@ -183,11 +182,11 @@ 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, + CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc, arg); kmalloc_ok = save_kmalloc_ok; } - + unsigned long stack_sp(unsigned long page) { return(page + PAGE_SIZE - sizeof(void *)); @@ -211,7 +210,7 @@ void default_idle(void) */ if(need_resched()) schedule(); - + idle_sleep(10); } } @@ -226,7 +225,7 @@ int page_size(void) return(PAGE_SIZE); } -void *um_virt_to_phys(struct task_struct *task, unsigned long addr, +void *um_virt_to_phys(struct task_struct *task, unsigned long addr, pte_t *pte_out) { pgd_t *pgd; @@ -235,7 +234,7 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr, pte_t *pte; pte_t ptent; - if(task->mm == NULL) + if(task->mm == NULL) return(ERR_PTR(-EINVAL)); pgd = pgd_offset(task->mm, addr); if(!pgd_present(*pgd)) @@ -246,7 +245,7 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr, return(ERR_PTR(-EINVAL)); pmd = pmd_offset(pud, addr); - if(!pmd_present(*pmd)) + if(!pmd_present(*pmd)) return(ERR_PTR(-EINVAL)); pte = pte_offset_kernel(pmd, addr); @@ -271,7 +270,7 @@ char *current_cmd(void) void force_sigbus(void) { - printk(KERN_ERR "Killing pid %d because of a lack of memory\n", + printk(KERN_ERR "Killing pid %d because of a lack of memory\n", current->pid); lock_kernel(); sigaddset(¤t->pending.signal, SIGBUS); diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile index ea3a8e409a6..3e3fa7e7e3c 100644 --- a/arch/um/kernel/skas/Makefile +++ b/arch/um/kernel/skas/Makefile @@ -3,8 +3,7 @@ # Licensed under the GPL # -obj-y := clone.o exec_kern.o mem.o mmu.o process_kern.o \ - syscall.o tlb.o uaccess.o +obj-y := clone.o exec.o mem.o mmu.o process.o syscall.o tlb.o uaccess.o # clone.o is in the stub, so it can't be built with profiling # GCC hardened also auto-enables -fpic, but we need %ebx so it can't work -> diff --git a/arch/um/kernel/skas/exec.c b/arch/um/kernel/skas/exec.c new file mode 100644 index 00000000000..54b79595137 --- /dev/null +++ b/arch/um/kernel/skas/exec.c @@ -0,0 +1,30 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include "linux/kernel.h" +#include "asm/current.h" +#include "asm/page.h" +#include "asm/signal.h" +#include "asm/ptrace.h" +#include "asm/uaccess.h" +#include "asm/mmu_context.h" +#include "tlb.h" +#include "skas.h" +#include "um_mmu.h" +#include "os.h" + +void flush_thread_skas(void) +{ + force_flush_all(); + switch_mm_skas(¤t->mm->context.skas.id); +} + +void start_thread_skas(struct pt_regs *regs, unsigned long eip, + unsigned long esp) +{ + set_fs(USER_DS); + PT_REGS_IP(regs) = eip; + PT_REGS_SP(regs) = esp; +} diff --git a/arch/um/kernel/skas/exec_kern.c b/arch/um/kernel/skas/exec_kern.c deleted file mode 100644 index 77ed7bbab21..00000000000 --- a/arch/um/kernel/skas/exec_kern.c +++ /dev/null @@ -1,41 +0,0 @@ -/* - * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) - * Licensed under the GPL - */ - -#include "linux/kernel.h" -#include "asm/current.h" -#include "asm/page.h" -#include "asm/signal.h" -#include "asm/ptrace.h" -#include "asm/uaccess.h" -#include "asm/mmu_context.h" -#include "tlb.h" -#include "skas.h" -#include "um_mmu.h" -#include "os.h" - -void flush_thread_skas(void) -{ - force_flush_all(); - switch_mm_skas(¤t->mm->context.skas.id); -} - -void start_thread_skas(struct pt_regs *regs, unsigned long eip, - unsigned long esp) -{ - set_fs(USER_DS); - PT_REGS_IP(regs) = eip; - PT_REGS_SP(regs) = esp; -} - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/kernel/skas/process.c b/arch/um/kernel/skas/process.c new file mode 100644 index 00000000000..ae4fa71d3b8 --- /dev/null +++ b/arch/um/kernel/skas/process.c @@ -0,0 +1,217 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include "linux/sched.h" +#include "linux/slab.h" +#include "linux/ptrace.h" +#include "linux/proc_fs.h" +#include "linux/file.h" +#include "linux/errno.h" +#include "linux/init.h" +#include "asm/uaccess.h" +#include "asm/atomic.h" +#include "kern_util.h" +#include "skas.h" +#include "os.h" +#include "user_util.h" +#include "tlb.h" +#include "kern.h" +#include "mode.h" +#include "registers.h" + +void switch_to_skas(void *prev, void *next) +{ + struct task_struct *from, *to; + + from = prev; + to = next; + + /* XXX need to check runqueues[cpu].idle */ + if(current->pid == 0) + switch_timers(0); + + switch_threads(&from->thread.mode.skas.switch_buf, + &to->thread.mode.skas.switch_buf); + + arch_switch_to_skas(current->thread.prev_sched, current); + + if(current->pid == 0) + switch_timers(1); +} + +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) +{ + 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); +} + +void release_thread_skas(struct task_struct *task) +{ +} + +/* 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_skas isn't needed. We could want to apply this to + * improve performance. -bb */ + arch_switch_to_skas(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_skas(int nr, unsigned long clone_flags, unsigned long sp, + unsigned long stack_top, struct task_struct * p, + struct pt_regs *regs) +{ + void (*handler)(void); + + if(current->thread.forking){ + memcpy(&p->thread.regs.regs.skas, ®s->regs.skas, + sizeof(p->thread.regs.regs.skas)); + REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0); + if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp; + + handler = fork_handler; + + 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.mode.skas.switch_buf, + handler); + return(0); +} + +int new_mm(unsigned long stack) +{ + int fd; + + fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0); + if(fd < 0) + return(fd); + + if(skas_needs_stub) + map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack); + + return(fd); +} + +void init_idle_skas(void) +{ + cpu_tasks[current_thread->cpu].pid = os_getpid(); + default_idle(); +} + +extern void start_kernel(void); + +static int start_kernel_proc(void *unused) +{ + int pid; + + block_signals(); + pid = os_getpid(); + + cpu_tasks[0].pid = pid; + cpu_tasks[0].task = current; +#ifdef CONFIG_SMP + cpu_online_map = cpumask_of_cpu(0); +#endif + start_kernel(); + return(0); +} + +extern int userspace_pid[]; + +int start_uml_skas(void) +{ + if(proc_mm) + userspace_pid[0] = start_userspace(0); + + init_new_thread_signals(); + + init_task.thread.request.u.thread.proc = start_kernel_proc; + init_task.thread.request.u.thread.arg = NULL; + return(start_idle_thread(task_stack_page(&init_task), + &init_task.thread.mode.skas.switch_buf)); +} + +int external_pid_skas(struct task_struct *task) +{ +#warning Need to look up userspace_pid by cpu + return(userspace_pid[0]); +} + +int thread_pid_skas(struct task_struct *task) +{ +#warning Need to look up userspace_pid by cpu + return(userspace_pid[0]); +} + +void kill_off_processes_skas(void) +{ + if(proc_mm) +#warning need to loop over userspace_pids in kill_off_processes_skas + os_kill_ptraced_process(userspace_pid[0], 1); + else { + struct task_struct *p; + int pid, me; + + me = os_getpid(); + for_each_process(p){ + if(p->mm == NULL) + continue; + + pid = p->mm->context.skas.id.u.pid; + os_kill_ptraced_process(pid, 1); + } + } +} + +unsigned long current_stub_stack(void) +{ + if(current->mm == NULL) + return(0); + + return(current->mm->context.skas.id.stack); +} diff --git a/arch/um/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c index c73d47c57ab..0f3d5d084dc 100644 --- a/arch/um/kernel/skas/process_kern.c +++ b/arch/um/kernel/skas/process_kern.c @@ -1,217 +1,484 @@ /* - * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright 2003 PathScale, Inc. * Licensed under the GPL */ +#include "linux/config.h" +#include "linux/kernel.h" #include "linux/sched.h" +#include "linux/interrupt.h" +#include "linux/string.h" +#include "linux/mm.h" #include "linux/slab.h" -#include "linux/ptrace.h" -#include "linux/proc_fs.h" -#include "linux/file.h" -#include "linux/errno.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/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 "asm/pgtable.h" +#include "asm/processor.h" +#include "asm/tlbflush.h" #include "asm/uaccess.h" -#include "asm/atomic.h" -#include "kern_util.h" -#include "skas.h" -#include "os.h" +#include "asm/user.h" #include "user_util.h" -#include "tlb.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 "registers.h" +#include "mode_kern.h" +#include "choose-mode.h" + +/* 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) +{ + struct task_struct *task = t ? t : current; + + return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task)); +} + +int pid_to_processor_id(int pid) +{ + int i; -void switch_to_skas(void *prev, void *next) + for(i = 0; i < ncpus; i++){ + if(cpu_tasks[i].pid == pid) return(i); + } + return(-1); +} + +void free_stack(unsigned long stack, int order) { - struct task_struct *from, *to; + free_pages(stack, order); +} - from = prev; - to = next; +unsigned long alloc_stack(int order, int atomic) +{ + unsigned long page; + gfp_t flags = GFP_KERNEL; - /* XXX need to check runqueues[cpu].idle */ - if(current->pid == 0) - switch_timers(0); + if (atomic) + flags = GFP_ATOMIC; + page = __get_free_pages(flags, order); + if(page == 0) + return(0); + stack_protections(page); + return(page); +} - switch_threads(&from->thread.mode.skas.switch_buf, - &to->thread.mode.skas.switch_buf); +int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +{ + int pid; + + current->thread.request.u.thread.proc = fn; + 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); +} - arch_switch_to_skas(current->thread.prev_sched, current); +void set_current(void *t) +{ + struct task_struct *task = t; - if(current->pid == 0) - switch_timers(1); + cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) + { external_pid(task), task }); } -extern void schedule_tail(struct task_struct *prev); +void *_switch_to(void *prev, void *next, void *last) +{ + struct task_struct *from = prev; + struct task_struct *to= next; -/* This is called magically, by its address being stuffed in a jmp_buf - * and being longjmp-d to. - */ -void new_thread_handler(void) + to->thread.prev_sched = from; + 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) + show_regs(&(current->thread.regs)); + next= current->thread.saved_task; + prev= current; + } while(current->thread.saved_task); + + return(current->thread.prev_sched); + +} + +void interrupt_end(void) { - int (*fn)(void *), n; - void *arg; + if(need_resched()) schedule(); + if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal(); +} - if(current->thread.prev_sched != NULL) - schedule_tail(current->thread.prev_sched); - current->thread.prev_sched = NULL; +void release_thread(struct task_struct *task) +{ + CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task)); +} - fn = current->thread.request.u.thread.proc; - arg = current->thread.request.u.thread.arg; +void exit_thread(void) +{ + unprotect_stack((unsigned long) current_thread); +} - /* The return value is 1 if the kernel thread execs a process, - * 0 if it just exits +void *get_current(void) +{ + return(current); +} + +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; + + 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; + + clear_flushed_tls(p); + + /* + * Set a new TLS for the child thread? */ - 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); + if (clone_flags & CLONE_SETTLS) + ret = arch_copy_tls(p); + +out: + return ret; +} + +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); + 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); + + 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()) + schedule(); + + idle_sleep(10); } - else do_exit(0); } -void release_thread_skas(struct task_struct *task) +void cpu_idle(void) { + CHOOSE_MODE(init_idle_tt(), init_idle_skas()); } -/* Called magically, see new_thread_handler above */ -void fork_handler(void) +int page_size(void) { - force_flush_all(); - if(current->thread.prev_sched == NULL) - panic("blech"); + return(PAGE_SIZE); +} - schedule_tail(current->thread.prev_sched); +void *um_virt_to_phys(struct task_struct *task, unsigned long addr, + pte_t *pte_out) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + pte_t ptent; + + if(task->mm == NULL) + return(ERR_PTR(-EINVAL)); + pgd = pgd_offset(task->mm, addr); + if(!pgd_present(*pgd)) + return(ERR_PTR(-EINVAL)); + + pud = pud_offset(pgd, addr); + if(!pud_present(*pud)) + return(ERR_PTR(-EINVAL)); + + pmd = pmd_offset(pud, addr); + 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_out != NULL) + *pte_out = ptent; + return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK)); +} - /* XXX: if interrupt_end() calls schedule, this call to - * arch_switch_to_skas isn't needed. We could want to apply this to - * improve performance. -bb */ - arch_switch_to_skas(current->thread.prev_sched, current); +char *current_cmd(void) +{ +#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM) + 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 +} - current->thread.prev_sched = NULL; +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); +} -/* Handle any immediate reschedules or signals */ - interrupt_end(); +void dump_thread(struct pt_regs *regs, struct user *u) +{ +} - userspace(¤t->thread.regs.regs); +void enable_hlt(void) +{ + panic("enable_hlt"); } -int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp, - unsigned long stack_top, struct task_struct * p, - struct pt_regs *regs) +EXPORT_SYMBOL(enable_hlt); + +void disable_hlt(void) { - void (*handler)(void); + panic("disable_hlt"); +} - if(current->thread.forking){ - memcpy(&p->thread.regs.regs.skas, ®s->regs.skas, - sizeof(p->thread.regs.regs.skas)); - REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0); - if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp; +EXPORT_SYMBOL(disable_hlt); - handler = fork_handler; +void *um_kmalloc(int size) +{ + return kmalloc(size, GFP_KERNEL); +} - 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; - } +void *um_kmalloc_atomic(int size) +{ + return kmalloc(size, GFP_ATOMIC); +} - new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf, - handler); - return(0); +void *um_vmalloc(int size) +{ + return vmalloc(size); } -int new_mm(unsigned long stack) +void *um_vmalloc_atomic(int size) { - int fd; + return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL); +} - fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0); - if(fd < 0) - return(fd); +int __cant_sleep(void) { + return in_atomic() || irqs_disabled() || in_interrupt(); + /* Is in_interrupt() really needed? */ +} - if(skas_needs_stub) - map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack); +unsigned long get_fault_addr(void) +{ + return((unsigned long) current->thread.fault_addr); +} - return(fd); +EXPORT_SYMBOL(get_fault_addr); + +void not_implemented(void) +{ + printk(KERN_DEBUG "Something isn't implemented in here\n"); } -void init_idle_skas(void) +EXPORT_SYMBOL(not_implemented); + +int user_context(unsigned long sp) { - cpu_tasks[current_thread->cpu].pid = os_getpid(); - default_idle(); + unsigned long stack; + + stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER); + return(stack != (unsigned long) current_thread); } -extern void start_kernel(void); +extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end; -static int start_kernel_proc(void *unused) +void do_uml_exitcalls(void) { - int pid; + exitcall_t *call; + + call = &__uml_exitcall_end; + while (--call >= &__uml_exitcall_begin) + (*call)(); +} - block_signals(); - pid = os_getpid(); +char *uml_strdup(char *string) +{ + return kstrdup(string, GFP_KERNEL); +} - cpu_tasks[0].pid = pid; - cpu_tasks[0].task = current; +int copy_to_user_proc(void __user *to, void *from, int 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)); +} + +int clear_user_proc(void __user *buf, int size) +{ + return(clear_user(buf, size)); +} + +int strlen_user_proc(char __user *str) +{ + return(strlen_user(str)); +} + +int smp_sigio_handler(void) +{ #ifdef CONFIG_SMP - cpu_online_map = cpumask_of_cpu(0); + int cpu = current_thread->cpu; + IPI_handler(cpu); + if(cpu != 0) + return(1); #endif - start_kernel(); return(0); } -extern int userspace_pid[]; - -int start_uml_skas(void) +int cpu(void) { - if(proc_mm) - userspace_pid[0] = start_userspace(0); + return(current_thread->cpu); +} - init_new_thread_signals(); +static atomic_t using_sysemu = ATOMIC_INIT(0); +int sysemu_supported; - init_task.thread.request.u.thread.proc = start_kernel_proc; - init_task.thread.request.u.thread.arg = NULL; - return(start_idle_thread(task_stack_page(&init_task), - &init_task.thread.mode.skas.switch_buf)); +void set_using_sysemu(int value) +{ + if (value > sysemu_supported) + return; + atomic_set(&using_sysemu, value); } -int external_pid_skas(struct task_struct *task) +int get_using_sysemu(void) { -#warning Need to look up userspace_pid by cpu - return(userspace_pid[0]); + return atomic_read(&using_sysemu); } -int thread_pid_skas(struct task_struct *task) +static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data) { -#warning Need to look up userspace_pid by cpu - return(userspace_pid[0]); + if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/ + *eof = 1; + + return strlen(buf); } -void kill_off_processes_skas(void) +static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data) { - if(proc_mm) -#warning need to loop over userspace_pids in kill_off_processes_skas - os_kill_ptraced_process(userspace_pid[0], 1); - else { - struct task_struct *p; - int pid, me; + char tmp[2]; - me = os_getpid(); - for_each_process(p){ - if(p->mm == NULL) - continue; + if (copy_from_user(tmp, buf, 1)) + return -EFAULT; - pid = p->mm->context.skas.id.u.pid; - os_kill_ptraced_process(pid, 1); - } + 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*/ +} + +int __init make_proc_sysemu(void) +{ + struct proc_dir_entry *ent; + if (!sysemu_supported) + return 0; + + ent = create_proc_entry("sysemu", 0600, &proc_root); + + if (ent == NULL) + { + printk(KERN_WARNING "Failed to register /proc/sysemu\n"); + return(0); } + + ent->read_proc = proc_read_sysemu; + ent->write_proc = proc_write_sysemu; + + return 0; } -unsigned long current_stub_stack(void) +late_initcall(make_proc_sysemu); + +int singlestepping(void * t) { - if(current->mm == NULL) + struct task_struct *task = t ? t : current; + + if ( ! (task->ptrace & PT_DTRACE) ) return(0); - return(current->mm->context.skas.id.stack); + if (task->thread.singlestep_syscall) + return(1); + + return 2; +} + +/* + * Only x86 and x86_64 have an arch_align_stack(). + * All other arches have "#define arch_align_stack(x) (x)" + * in their asm/system.h + * As this is included in UML from asm-um/system-generic.h, + * we can use it to behave as the subarch does. + */ +#ifndef arch_align_stack +unsigned long arch_align_stack(unsigned long sp) +{ + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) + sp -= get_random_int() % 8192; + return sp & ~0xf; } +#endif |