diff options
Diffstat (limited to 'arch/um/kernel')
| -rw-r--r-- | arch/um/kernel/process.c | 8 | ||||
| -rw-r--r-- | arch/um/kernel/skas/clone.c | 6 | ||||
| -rw-r--r-- | arch/um/kernel/skas/mmu.c | 3 | ||||
| -rw-r--r-- | arch/um/kernel/skas/syscall.c | 21 | ||||
| -rw-r--r-- | arch/um/kernel/time.c | 73 | ||||
| -rw-r--r-- | arch/um/kernel/tlb.c | 16 |
6 files changed, 77 insertions, 50 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c index a6d9226..48af59a 100644 --- a/arch/um/kernel/process.c +++ b/arch/um/kernel/process.c @@ -1,4 +1,6 @@ /* + * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk}) + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright 2003 PathScale, Inc. * Licensed under the GPL @@ -27,6 +29,7 @@ #include <kern_util.h> #include <os.h> #include <skas.h> +#include <timer-internal.h> /* * This is a per-cpu array. A processor only modifies its entry and it only @@ -203,11 +206,8 @@ void initial_thread_cb(void (*proc)(void *), void *arg) void arch_cpu_idle(void) { - unsigned long long nsecs; - cpu_tasks[current_thread_info()->cpu].pid = os_getpid(); - nsecs = disable_timer(); - idle_sleep(nsecs); + os_idle_sleep(UM_NSEC_PER_SEC); local_irq_enable(); } diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c index 289771d..0f25d41 100644 --- a/arch/um/kernel/skas/clone.c +++ b/arch/um/kernel/skas/clone.c @@ -1,4 +1,5 @@ /* + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ @@ -35,11 +36,6 @@ stub_clone_handler(void) if (err) goto out; - err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, - (long) &data->timer, 0); - if (err) - goto out; - remap_stack(data->fd, data->offset); goto done; diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index fda1deb..9591a66 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -1,4 +1,5 @@ /* + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ @@ -61,10 +62,12 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm) if (current->mm != NULL && current->mm != &init_mm) from_mm = ¤t->mm->context; + block_signals(); if (from_mm) to_mm->id.u.pid = copy_context_skas0(stack, from_mm->id.u.pid); else to_mm->id.u.pid = start_userspace(stack); + unblock_signals(); if (to_mm->id.u.pid < 0) { ret = to_mm->id.u.pid; diff --git a/arch/um/kernel/skas/syscall.c b/arch/um/kernel/skas/syscall.c index d9ec006..1683b8e 100644 --- a/arch/um/kernel/skas/syscall.c +++ b/arch/um/kernel/skas/syscall.c @@ -8,9 +8,7 @@ #include <kern_util.h> #include <sysdep/ptrace.h> #include <sysdep/syscalls.h> - -extern int syscall_table_size; -#define NR_SYSCALLS (syscall_table_size / sizeof(void *)) +#include <os.h> void handle_syscall(struct uml_pt_regs *r) { @@ -23,19 +21,12 @@ void handle_syscall(struct uml_pt_regs *r) goto out; } - /* - * This should go in the declaration of syscall, but when I do that, - * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing - * children at all, sometimes hanging when bash doesn't see the first - * ls exit. - * The assembly looks functionally the same to me. This is - * gcc version 4.0.1 20050727 (Red Hat 4.0.1-5) - * in case it's a compiler bug. - */ - syscall = UPT_SYSCALL_NR(r); - if ((syscall >= NR_SYSCALLS) || (syscall < 0)) + syscall = get_syscall(r); + + if ((syscall > __NR_syscall_max) || syscall < 0) result = -ENOSYS; - else result = EXECUTE_SYSCALL(syscall, regs); + else + result = EXECUTE_SYSCALL(syscall, regs); out: PT_REGS_SET_SYSCALL_RETURN(regs, result); diff --git a/arch/um/kernel/time.c b/arch/um/kernel/time.c index 5af441e..25c2366 100644 --- a/arch/um/kernel/time.c +++ b/arch/um/kernel/time.c @@ -1,4 +1,7 @@ /* + * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk}) + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) + * Copyright (C) 2012-2014 Cisco Systems * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ @@ -7,11 +10,15 @@ #include <linux/init.h> #include <linux/interrupt.h> #include <linux/jiffies.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/spinlock.h> #include <linux/threads.h> #include <asm/irq.h> #include <asm/param.h> #include <kern_util.h> #include <os.h> +#include <timer-internal.h> void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs) { @@ -24,81 +31,97 @@ void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs) static int itimer_shutdown(struct clock_event_device *evt) { - disable_timer(); + os_timer_disable(); return 0; } static int itimer_set_periodic(struct clock_event_device *evt) { - set_interval(); + os_timer_set_interval(NULL, NULL); return 0; } static int itimer_next_event(unsigned long delta, struct clock_event_device *evt) { - return timer_one_shot(delta + 1); + return os_timer_one_shot(delta); } -static struct clock_event_device itimer_clockevent = { - .name = "itimer", +static int itimer_one_shot(struct clock_event_device *evt) +{ + os_timer_one_shot(1); + return 0; +} + +static struct clock_event_device timer_clockevent = { + .name = "posix-timer", .rating = 250, .cpumask = cpu_all_mask, .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, .set_state_shutdown = itimer_shutdown, .set_state_periodic = itimer_set_periodic, - .set_state_oneshot = itimer_shutdown, + .set_state_oneshot = itimer_one_shot, .set_next_event = itimer_next_event, - .shift = 32, + .shift = 0, + .max_delta_ns = 0xffffffff, + .min_delta_ns = TIMER_MIN_DELTA, //microsecond resolution should be enough for anyone, same as 640K RAM .irq = 0, + .mult = 1, }; static irqreturn_t um_timer(int irq, void *dev) { - (*itimer_clockevent.event_handler)(&itimer_clockevent); + if (get_current()->mm != NULL) + { + /* userspace - relay signal, results in correct userspace timers */ + os_alarm_process(get_current()->mm->context.id.u.pid); + } + + (*timer_clockevent.event_handler)(&timer_clockevent); return IRQ_HANDLED; } -static cycle_t itimer_read(struct clocksource *cs) +static cycle_t timer_read(struct clocksource *cs) { - return os_nsecs() / 1000; + return os_nsecs() / TIMER_MULTIPLIER; } -static struct clocksource itimer_clocksource = { - .name = "itimer", +static struct clocksource timer_clocksource = { + .name = "timer", .rating = 300, - .read = itimer_read, + .read = timer_read, .mask = CLOCKSOURCE_MASK(64), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -static void __init setup_itimer(void) +static void __init timer_setup(void) { int err; - err = request_irq(TIMER_IRQ, um_timer, 0, "timer", NULL); + err = request_irq(TIMER_IRQ, um_timer, IRQF_TIMER, "hr timer", NULL); if (err != 0) printk(KERN_ERR "register_timer : request_irq failed - " "errno = %d\n", -err); - itimer_clockevent.mult = div_sc(HZ, NSEC_PER_SEC, 32); - itimer_clockevent.max_delta_ns = - clockevent_delta2ns(60 * HZ, &itimer_clockevent); - itimer_clockevent.min_delta_ns = - clockevent_delta2ns(1, &itimer_clockevent); - err = clocksource_register_hz(&itimer_clocksource, USEC_PER_SEC); + err = os_timer_create(NULL); + if (err != 0) { + printk(KERN_ERR "creation of timer failed - errno = %d\n", -err); + return; + } + + err = clocksource_register_hz(&timer_clocksource, NSEC_PER_SEC/TIMER_MULTIPLIER); if (err) { printk(KERN_ERR "clocksource_register_hz returned %d\n", err); return; } - clockevents_register_device(&itimer_clockevent); + clockevents_register_device(&timer_clockevent); } void read_persistent_clock(struct timespec *ts) { - long long nsecs = os_nsecs(); + long long nsecs = os_persistent_clock_emulation(); set_normalized_timespec(ts, nsecs / NSEC_PER_SEC, nsecs % NSEC_PER_SEC); @@ -106,6 +129,6 @@ void read_persistent_clock(struct timespec *ts) void __init time_init(void) { - timer_init(); - late_time_init = setup_itimer; + timer_set_signal_handler(); + late_time_init = timer_setup; } diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 2077248..3777b82 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -50,6 +50,13 @@ struct host_vm_change { .index = 0, \ .force = force }) +static void report_enomem(void) +{ + printk(KERN_ERR "UML ran out of memory on the host side! " + "This can happen due to a memory limitation or " + "vm.max_map_count has been reached.\n"); +} + static int do_ops(struct host_vm_change *hvc, int end, int finished) { @@ -81,6 +88,9 @@ static int do_ops(struct host_vm_change *hvc, int end, } } + if (ret == -ENOMEM) + report_enomem(); + return ret; } @@ -433,8 +443,12 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) else if (pte_newprot(*pte)) err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush); - if (err) + if (err) { + if (err == -ENOMEM) + report_enomem(); + goto kill; + } *pte = pte_mkuptodate(*pte); |