diff options
Diffstat (limited to 'arch/um/os-Linux')
| -rw-r--r-- | arch/um/os-Linux/Makefile | 2 | ||||
| -rw-r--r-- | arch/um/os-Linux/helper.c | 4 | ||||
| -rw-r--r-- | arch/um/os-Linux/irq.c | 4 | ||||
| -rw-r--r-- | arch/um/os-Linux/sigio.c | 70 | ||||
| -rw-r--r-- | arch/um/os-Linux/signal.c | 22 | ||||
| -rw-r--r-- | arch/um/os-Linux/skas/process.c | 15 | ||||
| -rw-r--r-- | arch/um/os-Linux/time.c | 17 | ||||
| -rw-r--r-- | arch/um/os-Linux/umid.c | 17 |
8 files changed, 87 insertions, 64 deletions
diff --git a/arch/um/os-Linux/Makefile b/arch/um/os-Linux/Makefile index 839915b8c31c..77ac50baa3f8 100644 --- a/arch/um/os-Linux/Makefile +++ b/arch/um/os-Linux/Makefile @@ -10,6 +10,8 @@ obj-y = execvp.o file.o helper.o irq.o main.o mem.o process.o \ registers.o sigio.o signal.o start_up.o time.o tty.o \ umid.o user_syms.o util.o drivers/ skas/ +CFLAGS_signal.o += -Wframe-larger-than=4096 + obj-$(CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA) += elf_aux.o USER_OBJS := $(user-objs-y) elf_aux.o execvp.o file.o helper.o irq.o \ diff --git a/arch/um/os-Linux/helper.c b/arch/um/os-Linux/helper.c index 9fa6e4187d4f..feb48d796e00 100644 --- a/arch/um/os-Linux/helper.c +++ b/arch/um/os-Linux/helper.c @@ -45,7 +45,7 @@ int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv) unsigned long stack, sp; int pid, fds[2], ret, n; - stack = alloc_stack(0, __cant_sleep()); + stack = alloc_stack(__cant_sleep()); if (stack == 0) return -ENOMEM; @@ -116,7 +116,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags, unsigned long stack, sp; int pid, status, err; - stack = alloc_stack(0, __cant_sleep()); + stack = alloc_stack(__cant_sleep()); if (stack == 0) return -ENOMEM; diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c index d508310ee5e1..98ea910ef87c 100644 --- a/arch/um/os-Linux/irq.c +++ b/arch/um/os-Linux/irq.c @@ -45,10 +45,10 @@ int os_epoll_triggered(int index, int events) * access to the right includes/defines for EPOLL constants. */ -int os_event_mask(int irq_type) +int os_event_mask(enum um_irq_type irq_type) { if (irq_type == IRQ_READ) - return EPOLLIN | EPOLLPRI; + return EPOLLIN | EPOLLPRI | EPOLLERR | EPOLLHUP | EPOLLRDHUP; if (irq_type == IRQ_WRITE) return EPOLLOUT; return 0; diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c index 75558080d0bf..6597ea1986ff 100644 --- a/arch/um/os-Linux/sigio.c +++ b/arch/um/os-Linux/sigio.c @@ -164,45 +164,55 @@ static void update_thread(void) set_signals_trace(flags); } -int add_sigio_fd(int fd) +int __add_sigio_fd(int fd) { struct pollfd *p; - int err = 0, i, n; + int err, i, n; - sigio_lock(); for (i = 0; i < all_sigio_fds.used; i++) { if (all_sigio_fds.poll[i].fd == fd) break; } if (i == all_sigio_fds.used) - goto out; + return -ENOSPC; p = &all_sigio_fds.poll[i]; for (i = 0; i < current_poll.used; i++) { if (current_poll.poll[i].fd == fd) - goto out; + return 0; } n = current_poll.used; err = need_poll(&next_poll, n + 1); if (err) - goto out; + return err; memcpy(next_poll.poll, current_poll.poll, current_poll.used * sizeof(struct pollfd)); next_poll.poll[n] = *p; next_poll.used = n + 1; update_thread(); - out: + + return 0; +} + + +int add_sigio_fd(int fd) +{ + int err; + + sigio_lock(); + err = __add_sigio_fd(fd); sigio_unlock(); + return err; } -int ignore_sigio_fd(int fd) +int __ignore_sigio_fd(int fd) { struct pollfd *p; - int err = 0, i, n = 0; + int err, i, n = 0; /* * This is called from exitcalls elsewhere in UML - if @@ -212,17 +222,16 @@ int ignore_sigio_fd(int fd) if (write_sigio_pid == -1) return -EIO; - sigio_lock(); for (i = 0; i < current_poll.used; i++) { if (current_poll.poll[i].fd == fd) break; } if (i == current_poll.used) - goto out; + return -ENOENT; err = need_poll(&next_poll, current_poll.used - 1); if (err) - goto out; + return err; for (i = 0; i < current_poll.used; i++) { p = ¤t_poll.poll[i]; @@ -232,8 +241,18 @@ int ignore_sigio_fd(int fd) next_poll.used = current_poll.used - 1; update_thread(); - out: + + return 0; +} + +int ignore_sigio_fd(int fd) +{ + int err; + + sigio_lock(); + err = __ignore_sigio_fd(fd); sigio_unlock(); + return err; } @@ -336,7 +355,7 @@ out_close1: close(l_write_sigio_fds[1]); } -void sigio_broken(int fd, int read) +void sigio_broken(int fd) { int err; @@ -352,7 +371,7 @@ void sigio_broken(int fd, int read) all_sigio_fds.poll[all_sigio_fds.used++] = ((struct pollfd) { .fd = fd, - .events = read ? POLLIN : POLLOUT, + .events = POLLIN, .revents = 0 }); out: sigio_unlock(); @@ -360,17 +379,16 @@ out: /* Changed during early boot */ static int pty_output_sigio; -static int pty_close_sigio; -void maybe_sigio_broken(int fd, int read) +void maybe_sigio_broken(int fd) { if (!isatty(fd)) return; - if ((read || pty_output_sigio) && (!read || pty_close_sigio)) + if (pty_output_sigio) return; - sigio_broken(fd, read); + sigio_broken(fd); } static void sigio_cleanup(void) @@ -514,19 +532,6 @@ static void tty_output(int master, int slave) printk(UM_KERN_CONT "tty_output : read failed, err = %d\n", n); } -static void tty_close(int master, int slave) -{ - printk(UM_KERN_INFO "Checking that host ptys support SIGIO on " - "close..."); - - close(slave); - if (got_sigio) { - printk(UM_KERN_CONT "Yes\n"); - pty_close_sigio = 1; - } else - printk(UM_KERN_CONT "No, enabling workaround\n"); -} - static void __init check_sigio(void) { if ((access("/dev/ptmx", R_OK) < 0) && @@ -536,7 +541,6 @@ static void __init check_sigio(void) return; } check_one_sigio(tty_output); - check_one_sigio(tty_close); } /* Here because it only does the SIGIO testing for now */ diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index b58bc68cbe64..96f511d1aabe 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -136,6 +136,16 @@ void set_sigstack(void *sig_stack, int size) panic("enabling signal stack failed, errno = %d\n", errno); } +static void sigusr1_handler(int sig, struct siginfo *unused_si, mcontext_t *mc) +{ + uml_pm_wake(); +} + +void register_pm_wake_signal(void) +{ + set_handler(SIGUSR1); +} + static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = { [SIGSEGV] = sig_handler, [SIGBUS] = sig_handler, @@ -145,7 +155,9 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = { [SIGIO] = sig_handler, [SIGWINCH] = sig_handler, - [SIGALRM] = timer_alarm_handler + [SIGALRM] = timer_alarm_handler, + + [SIGUSR1] = sigusr1_handler, }; static void hard_handler(int sig, siginfo_t *si, void *p) @@ -222,6 +234,11 @@ void set_handler(int sig) panic("sigprocmask failed - errno = %d\n", errno); } +void send_sigio_to_self(void) +{ + kill(os_getpid(), SIGIO); +} + int change_sig(int signal, int on) { sigset_t sigset; @@ -254,6 +271,9 @@ void unblock_signals(void) return; signals_enabled = 1; +#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT + deliver_time_travel_irqs(); +#endif /* * We loop because the IRQ handler returns with interrupts off. So, diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 4fb877b99dde..0621d521208e 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -400,7 +400,20 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs) if (WIFSTOPPED(status)) { int sig = WSTOPSIG(status); - ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si); + /* These signal handlers need the si argument. + * The SIGIO and SIGALARM handlers which constitute the + * majority of invocations, do not use it. + */ + switch (sig) { + case SIGSEGV: + case SIGTRAP: + case SIGILL: + case SIGBUS: + case SIGFPE: + case SIGWINCH: + ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si); + break; + } switch (sig) { case SIGSEGV: diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c index 90f6de224c70..a61cbf73a179 100644 --- a/arch/um/os-Linux/time.c +++ b/arch/um/os-Linux/time.c @@ -7,6 +7,7 @@ */ #include <stddef.h> +#include <unistd.h> #include <errno.h> #include <signal.h> #include <time.h> @@ -99,19 +100,9 @@ long long os_nsecs(void) } /** - * os_idle_sleep() - sleep for a given time of nsecs - * @nsecs: nanoseconds to sleep + * os_idle_sleep() - sleep until interrupted */ -void os_idle_sleep(unsigned long long nsecs) +void os_idle_sleep(void) { - struct timespec ts = { - .tv_sec = nsecs / UM_NSEC_PER_SEC, - .tv_nsec = nsecs % UM_NSEC_PER_SEC - }; - - /* - * Relay the signal if clock_nanosleep is interrupted. - */ - if (clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL)) - deliver_alarm(); + pause(); } diff --git a/arch/um/os-Linux/umid.c b/arch/um/os-Linux/umid.c index 1d7558dac75f..a3dd61521d24 100644 --- a/arch/um/os-Linux/umid.c +++ b/arch/um/os-Linux/umid.c @@ -137,20 +137,13 @@ static inline int is_umdir_used(char *dir) { char pid[sizeof("nnnnnnnnn")], *end, *file; int dead, fd, p, n, err; - size_t filelen; + size_t filelen = strlen(dir) + sizeof("/pid") + 1; - err = asprintf(&file, "%s/pid", dir); - if (err < 0) - return 0; - - filelen = strlen(file); + file = malloc(filelen); + if (!file) + return -ENOMEM; - n = snprintf(file, filelen, "%s/pid", dir); - if (n >= filelen) { - printk(UM_KERN_ERR "is_umdir_used - pid filename too long\n"); - err = -E2BIG; - goto out; - } + snprintf(file, filelen, "%s/pid", dir); dead = 0; fd = open(file, O_RDONLY); |