summaryrefslogtreecommitdiff
path: root/arch/um/os-Linux
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/os-Linux')
-rw-r--r--arch/um/os-Linux/internal.h1
-rw-r--r--arch/um/os-Linux/main.c7
-rw-r--r--arch/um/os-Linux/process.c6
-rw-r--r--arch/um/os-Linux/signal.c41
-rw-r--r--arch/um/os-Linux/skas/process.c55
-rw-r--r--arch/um/os-Linux/time.c249
6 files changed, 175 insertions, 184 deletions
diff --git a/arch/um/os-Linux/internal.h b/arch/um/os-Linux/internal.h
deleted file mode 100644
index 0dc2c9f13..000000000
--- a/arch/um/os-Linux/internal.h
+++ /dev/null
@@ -1 +0,0 @@
-void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc);
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index df9191acd..9d499de87 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -1,4 +1,5 @@
/*
+ * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
@@ -163,13 +164,13 @@ int __init main(int argc, char **argv, char **envp)
/*
* This signal stuff used to be in the reboot case. However,
- * sometimes a SIGVTALRM can come in when we're halting (reproducably
+ * sometimes a timer signal can come in when we're halting (reproducably
* when writing out gcov information, presumably because that takes
* some time) and cause a segfault.
*/
- /* stop timers and set SIGVTALRM to be ignored */
- disable_timer();
+ /* stop timers and set timer signal to be ignored */
+ os_timer_disable();
/* disable SIGIO for the fds and set SIGIO to be ignored */
err = deactivate_all_fds();
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index 8408aba91..b3e0d4093 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.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
*/
@@ -89,6 +90,11 @@ int os_process_parent(int pid)
return parent;
}
+void os_alarm_process(int pid)
+{
+ kill(pid, SIGALRM);
+}
+
void os_stop_process(int pid)
{
kill(pid, SIGSTOP);
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 036d0dbc7..c211153ca 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.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) 2004 PathScale, Inc
* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
@@ -13,7 +15,6 @@
#include <kern_util.h>
#include <os.h>
#include <sysdep/mcontext.h>
-#include "internal.h"
void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGTRAP] = relay_signal,
@@ -23,7 +24,8 @@ void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = {
[SIGBUS] = bus_handler,
[SIGSEGV] = segv_handler,
[SIGIO] = sigio_handler,
- [SIGVTALRM] = timer_handler };
+ [SIGALRM] = timer_handler
+};
static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
{
@@ -38,7 +40,7 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
}
/* enable signals if sig isn't IRQ signal */
- if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
+ if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGALRM))
unblock_signals();
(*sig_info[sig])(sig, si, &r);
@@ -55,8 +57,8 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc)
#define SIGIO_BIT 0
#define SIGIO_MASK (1 << SIGIO_BIT)
-#define SIGVTALRM_BIT 1
-#define SIGVTALRM_MASK (1 << SIGVTALRM_BIT)
+#define SIGALRM_BIT 1
+#define SIGALRM_MASK (1 << SIGALRM_BIT)
static int signals_enabled;
static unsigned int signals_pending;
@@ -78,36 +80,38 @@ void sig_handler(int sig, struct siginfo *si, mcontext_t *mc)
set_signals(enabled);
}
-static void real_alarm_handler(mcontext_t *mc)
+static void timer_real_alarm_handler(mcontext_t *mc)
{
struct uml_pt_regs regs;
if (mc != NULL)
get_regs_from_mc(&regs, mc);
- regs.is_user = 0;
- unblock_signals();
- timer_handler(SIGVTALRM, NULL, &regs);
+ timer_handler(SIGALRM, NULL, &regs);
}
-void alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
+void timer_alarm_handler(int sig, struct siginfo *unused_si, mcontext_t *mc)
{
int enabled;
enabled = signals_enabled;
if (!signals_enabled) {
- signals_pending |= SIGVTALRM_MASK;
+ signals_pending |= SIGALRM_MASK;
return;
}
block_signals();
- real_alarm_handler(mc);
+ timer_real_alarm_handler(mc);
set_signals(enabled);
}
-void timer_init(void)
+void deliver_alarm(void) {
+ timer_alarm_handler(SIGALRM, NULL, NULL);
+}
+
+void timer_set_signal_handler(void)
{
- set_handler(SIGVTALRM);
+ set_handler(SIGALRM);
}
void set_sigstack(void *sig_stack, int size)
@@ -131,10 +135,9 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
[SIGIO] = sig_handler,
[SIGWINCH] = sig_handler,
- [SIGVTALRM] = alarm_handler
+ [SIGALRM] = timer_alarm_handler
};
-
static void hard_handler(int sig, siginfo_t *si, void *p)
{
struct ucontext *uc = p;
@@ -188,9 +191,9 @@ void set_handler(int sig)
/* block irq ones */
sigemptyset(&action.sa_mask);
- sigaddset(&action.sa_mask, SIGVTALRM);
sigaddset(&action.sa_mask, SIGIO);
sigaddset(&action.sa_mask, SIGWINCH);
+ sigaddset(&action.sa_mask, SIGALRM);
if (sig == SIGSEGV)
flags |= SA_NODEFER;
@@ -283,8 +286,8 @@ void unblock_signals(void)
if (save_pending & SIGIO_MASK)
sig_handler_common(SIGIO, NULL, NULL);
- if (save_pending & SIGVTALRM_MASK)
- real_alarm_handler(NULL);
+ if (save_pending & SIGALRM_MASK)
+ timer_real_alarm_handler(NULL);
}
}
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 3dddedba3..b856c66eb 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.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
*/
@@ -45,7 +46,7 @@ static int ptrace_dump_regs(int pid)
* Signals that are OK to receive in the stub - we'll just continue it.
* SIGWINCH will happen when UML is inside a detached screen.
*/
-#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
+#define STUB_SIG_MASK ((1 << SIGALRM) | (1 << SIGWINCH))
/* Signals that the stub will finish with - anything else is an error */
#define STUB_DONE_MASK (1 << SIGTRAP)
@@ -137,9 +138,6 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
fatal_sigsegv();
- /* Mark this as a syscall */
- UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
-
if (!local_using_sysemu)
{
err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
@@ -174,24 +172,25 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
handle_syscall(regs);
}
+int get_syscall(struct uml_pt_regs *regs)
+{
+ UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
+
+ return UPT_SYSCALL_NR(regs);
+}
+
extern char __syscall_stub_start[];
static int userspace_tramp(void *stack)
{
void *addr;
- int err, fd;
+ int fd;
unsigned long long offset;
ptrace(PTRACE_TRACEME, 0, 0, 0);
signal(SIGTERM, SIG_DFL);
signal(SIGWINCH, SIG_IGN);
- err = set_interval();
- if (err) {
- printk(UM_KERN_ERR "userspace_tramp - setting timer failed, "
- "errno = %d\n", err);
- exit(1);
- }
/*
* This has a pte, but it can't be mapped in with the usual
@@ -282,7 +281,7 @@ int start_userspace(unsigned long stub_stack)
"errno = %d\n", errno);
goto out_kill;
}
- } while (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
+ } while (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGALRM));
if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) {
err = -EINVAL;
@@ -315,8 +314,6 @@ int start_userspace(unsigned long stub_stack)
void userspace(struct uml_pt_regs *regs)
{
- struct itimerval timer;
- unsigned long long nsecs, now;
int err, status, op, pid = userspace_pid[0];
/* To prevent races if using_sysemu changes under us.*/
int local_using_sysemu;
@@ -325,13 +322,8 @@ void userspace(struct uml_pt_regs *regs)
/* Handle any immediate reschedules or signals */
interrupt_end();
- if (getitimer(ITIMER_VIRTUAL, &timer))
- printk(UM_KERN_ERR "Failed to get itimer, errno = %d\n", errno);
- nsecs = timer.it_value.tv_sec * UM_NSEC_PER_SEC +
- timer.it_value.tv_usec * UM_NSEC_PER_USEC;
- nsecs += os_nsecs();
-
while (1) {
+
/*
* This can legitimately fail if the process loads a
* bogus value into a segment register. It will
@@ -401,18 +393,7 @@ void userspace(struct uml_pt_regs *regs)
case SIGTRAP:
relay_signal(SIGTRAP, (struct siginfo *)&si, regs);
break;
- case SIGVTALRM:
- now = os_nsecs();
- if (now < nsecs)
- break;
- block_signals();
- (*sig_info[sig])(sig, (struct siginfo *)&si, regs);
- unblock_signals();
- nsecs = timer.it_value.tv_sec *
- UM_NSEC_PER_SEC +
- timer.it_value.tv_usec *
- UM_NSEC_PER_USEC;
- nsecs += os_nsecs();
+ case SIGALRM:
break;
case SIGIO:
case SIGILL:
@@ -460,7 +441,6 @@ __initcall(init_thread_regs);
int copy_context_skas0(unsigned long new_stack, int pid)
{
- struct timeval tv = { .tv_sec = 0, .tv_usec = UM_USEC_PER_SEC / UM_HZ };
int err;
unsigned long current_stack = current_stub_stack();
struct stub_data *data = (struct stub_data *) current_stack;
@@ -472,11 +452,10 @@ int copy_context_skas0(unsigned long new_stack, int pid)
* prepare offset and fd of child's stack as argument for parent's
* and child's mmap2 calls
*/
- *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
- .fd = new_fd,
- .timer = ((struct itimerval)
- { .it_value = tv,
- .it_interval = tv }) });
+ *data = ((struct stub_data) {
+ .offset = MMAP_OFFSET(new_offset),
+ .fd = new_fd
+ });
err = ptrace_setregs(pid, thread_regs);
if (err < 0) {
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index e9824d5dd..0e39b9978 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/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
*/
@@ -10,177 +13,177 @@
#include <sys/time.h>
#include <kern_util.h>
#include <os.h>
-#include "internal.h"
+#include <string.h>
+#include <timer-internal.h>
-int set_interval(void)
-{
- int usec = UM_USEC_PER_SEC / UM_HZ;
- struct itimerval interval = ((struct itimerval) { { 0, usec },
- { 0, usec } });
-
- if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
- return -errno;
+static timer_t event_high_res_timer = 0;
- return 0;
+static inline long long timeval_to_ns(const struct timeval *tv)
+{
+ return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
+ tv->tv_usec * UM_NSEC_PER_USEC;
}
-int timer_one_shot(int ticks)
+static inline long long timespec_to_ns(const struct timespec *ts)
{
- unsigned long usec = ticks * UM_USEC_PER_SEC / UM_HZ;
- unsigned long sec = usec / UM_USEC_PER_SEC;
- struct itimerval interval;
-
- usec %= UM_USEC_PER_SEC;
- interval = ((struct itimerval) { { 0, 0 }, { sec, usec } });
+ return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) +
+ ts->tv_nsec;
+}
- if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
- return -errno;
+long long os_persistent_clock_emulation (void) {
+ struct timespec realtime_tp;
- return 0;
+ clock_gettime(CLOCK_REALTIME, &realtime_tp);
+ return timespec_to_ns(&realtime_tp);
}
/**
- * timeval_to_ns - Convert timeval to nanoseconds
- * @ts: pointer to the timeval variable to be converted
- *
- * Returns the scalar nanosecond representation of the timeval
- * parameter.
- *
- * Ripped from linux/time.h because it's a kernel header, and thus
- * unusable from here.
+ * os_timer_create() - create an new posix (interval) timer
*/
-static inline long long timeval_to_ns(const struct timeval *tv)
-{
- return ((long long) tv->tv_sec * UM_NSEC_PER_SEC) +
- tv->tv_usec * UM_NSEC_PER_USEC;
+int os_timer_create(void* timer) {
+
+ timer_t* t = timer;
+
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
+
+ if (timer_create(
+ CLOCK_MONOTONIC,
+ NULL,
+ t) == -1) {
+ return -1;
+ }
+ return 0;
}
-long long disable_timer(void)
+int os_timer_set_interval(void* timer, void* i)
{
- struct itimerval time = ((struct itimerval) { { 0, 0 }, { 0, 0 } });
- long long remain, max = UM_NSEC_PER_SEC / UM_HZ;
+ struct itimerspec its;
+ unsigned long long nsec;
+ timer_t* t = timer;
+ struct itimerspec* its_in = i;
- if (setitimer(ITIMER_VIRTUAL, &time, &time) < 0)
- printk(UM_KERN_ERR "disable_timer - setitimer failed, "
- "errno = %d\n", errno);
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
- remain = timeval_to_ns(&time.it_value);
- if (remain > max)
- remain = max;
+ nsec = UM_NSEC_PER_SEC / UM_HZ;
- return remain;
-}
+ if(its_in != NULL) {
+ its.it_value.tv_sec = its_in->it_value.tv_sec;
+ its.it_value.tv_nsec = its_in->it_value.tv_nsec;
+ } else {
+ its.it_value.tv_sec = 0;
+ its.it_value.tv_nsec = nsec;
+ }
-long long os_nsecs(void)
-{
- struct timeval tv;
+ its.it_interval.tv_sec = 0;
+ its.it_interval.tv_nsec = nsec;
- gettimeofday(&tv, NULL);
- return timeval_to_ns(&tv);
-}
+ if(timer_settime(*t, 0, &its, NULL) == -1) {
+ return -errno;
+ }
-#ifdef UML_CONFIG_NO_HZ_COMMON
-static int after_sleep_interval(struct timespec *ts)
-{
return 0;
}
-static void deliver_alarm(void)
+/**
+ * os_timer_remain() - returns the remaining nano seconds of the given interval
+ * timer
+ * Because this is the remaining time of an interval timer, which correspondends
+ * to HZ, this value can never be bigger than one second. Just
+ * the nanosecond part of the timer is returned.
+ * The returned time is relative to the start time of the interval timer.
+ * Return an negative value in an error case.
+ */
+long os_timer_remain(void* timer)
{
- alarm_handler(SIGVTALRM, NULL, NULL);
-}
+ struct itimerspec its;
+ timer_t* t = timer;
-static unsigned long long sleep_time(unsigned long long nsecs)
-{
- return nsecs;
-}
+ if(t == NULL) {
+ t = &event_high_res_timer;
+ }
-#else
-unsigned long long last_tick;
-unsigned long long skew;
+ if(timer_gettime(t, &its) == -1) {
+ return -errno;
+ }
-static void deliver_alarm(void)
-{
- unsigned long long this_tick = os_nsecs();
- int one_tick = UM_NSEC_PER_SEC / UM_HZ;
+ return its.it_value.tv_nsec;
+}
- /* Protection against the host's time going backwards */
- if ((last_tick != 0) && (this_tick < last_tick))
- this_tick = last_tick;
+int os_timer_one_shot(int ticks)
+{
+ struct itimerspec its;
+ unsigned long long nsec;
+ unsigned long sec;
- if (last_tick == 0)
- last_tick = this_tick - one_tick;
+ nsec = (ticks + 1);
+ sec = nsec / UM_NSEC_PER_SEC;
+ nsec = nsec % UM_NSEC_PER_SEC;
- skew += this_tick - last_tick;
+ its.it_value.tv_sec = nsec / UM_NSEC_PER_SEC;
+ its.it_value.tv_nsec = nsec;
- while (skew >= one_tick) {
- alarm_handler(SIGVTALRM, NULL, NULL);
- skew -= one_tick;
- }
+ its.it_interval.tv_sec = 0;
+ its.it_interval.tv_nsec = 0; // we cheat here
- last_tick = this_tick;
+ timer_settime(event_high_res_timer, 0, &its, NULL);
+ return 0;
}
-static unsigned long long sleep_time(unsigned long long nsecs)
+/**
+ * os_timer_disable() - disable the posix (interval) timer
+ * Returns the remaining interval timer time in nanoseconds
+ */
+long long os_timer_disable(void)
{
- return nsecs > skew ? nsecs - skew : 0;
-}
+ struct itimerspec its;
-static inline long long timespec_to_us(const struct timespec *ts)
-{
- return ((long long) ts->tv_sec * UM_USEC_PER_SEC) +
- ts->tv_nsec / UM_NSEC_PER_USEC;
+ memset(&its, 0, sizeof(struct itimerspec));
+ timer_settime(event_high_res_timer, 0, &its, &its);
+
+ return its.it_value.tv_sec * UM_NSEC_PER_SEC + its.it_value.tv_nsec;
}
-static int after_sleep_interval(struct timespec *ts)
+long long os_vnsecs(void)
{
- int usec = UM_USEC_PER_SEC / UM_HZ;
- long long start_usecs = timespec_to_us(ts);
- struct timeval tv;
- struct itimerval interval;
-
- /*
- * It seems that rounding can increase the value returned from
- * setitimer to larger than the one passed in. Over time,
- * this will cause the remaining time to be greater than the
- * tick interval. If this happens, then just reduce the first
- * tick to the interval value.
- */
- if (start_usecs > usec)
- start_usecs = usec;
-
- start_usecs -= skew / UM_NSEC_PER_USEC;
- if (start_usecs < 0)
- start_usecs = 0;
+ struct timespec ts;
- tv = ((struct timeval) { .tv_sec = start_usecs / UM_USEC_PER_SEC,
- .tv_usec = start_usecs % UM_USEC_PER_SEC });
- interval = ((struct itimerval) { { 0, usec }, tv });
+ clock_gettime(CLOCK_PROCESS_CPUTIME_ID,&ts);
+ return timespec_to_ns(&ts);
+}
- if (setitimer(ITIMER_VIRTUAL, &interval, NULL) == -1)
- return -errno;
+long long os_nsecs(void)
+{
+ struct timespec ts;
- return 0;
+ clock_gettime(CLOCK_MONOTONIC,&ts);
+ return timespec_to_ns(&ts);
}
-#endif
-void idle_sleep(unsigned long long nsecs)
+/**
+ * os_idle_sleep() - sleep for a given time of nsecs
+ * @nsecs: nanoseconds to sleep
+ */
+void os_idle_sleep(unsigned long long nsecs)
{
struct timespec ts;
- /*
- * nsecs can come in as zero, in which case, this starts a
- * busy loop. To prevent this, reset nsecs to the tick
- * interval if it is zero.
- */
- if (nsecs == 0)
- nsecs = UM_NSEC_PER_SEC / UM_HZ;
+ if (nsecs <= 0) {
+ return;
+ }
- nsecs = sleep_time(nsecs);
- ts = ((struct timespec) { .tv_sec = nsecs / UM_NSEC_PER_SEC,
- .tv_nsec = nsecs % UM_NSEC_PER_SEC });
+ ts = ((struct timespec) {
+ .tv_sec = nsecs / UM_NSEC_PER_SEC,
+ .tv_nsec = nsecs % UM_NSEC_PER_SEC
+ });
- if (nanosleep(&ts, &ts) == 0)
+ /*
+ * Relay the signal if clock_nanosleep is interrupted.
+ */
+ if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) {
deliver_alarm();
- after_sleep_interval(&ts);
+ }
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-14 06:33:38 +0000