#include <sched.h>
#include <errno.h>
#include <stdarg.h>
-#include <fcntl.h>
#include <stdlib.h>
#include <setjmp.h>
#include <sys/time.h>
#include <sys/ptrace.h>
-#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/sigcontext.h>
#include <asm/unistd.h>
#include <asm/page.h>
+#include <asm/user.h>
#include "user_util.h"
#include "kern_util.h"
#include "user.h"
int flags = 0, pages;
if(sig_stack != NULL){
- pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER) - 2;
+ pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
set_sigstack(sig_stack, pages * page_size());
flags = SA_ONSTACK;
}
set_handler(SIGWINCH, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGUSR2, (__sighandler_t) sig_handler,
- SA_NOMASK | flags, -1);
- (void) CHOOSE_MODE(signal(SIGCHLD, SIG_IGN), (void *) 0);
+ flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGHUP, SIG_IGN);
init_irq_signals(altstack);
/* Start the process and wait for it to kill itself */
new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
- if(new_pid < 0) return(-errno);
- while((err = waitpid(new_pid, &status, 0) < 0) && (errno == EINTR)) ;
- if(err < 0) panic("Waiting for outer trampoline failed - errno = %d",
- errno);
- if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
- panic("outer trampoline didn't exit with SIGKILL");
-
- return(arg.pid);
-}
+ if(new_pid < 0)
+ return(new_pid);
-void suspend_new_thread(int fd)
-{
- char c;
+ CATCH_EINTR(err = waitpid(new_pid, &status, 0));
+ if(err < 0)
+ panic("Waiting for outer trampoline failed - errno = %d",
+ errno);
- os_stop_process(os_getpid());
+ if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
+ panic("outer trampoline didn't exit with SIGKILL, "
+ "status = %d", status);
- if(read(fd, &c, sizeof(c)) != sizeof(c))
- panic("read failed in suspend_new_thread");
+ return(arg.pid);
}
static int ptrace_child(void *arg)
pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
if(pid < 0)
panic("check_ptrace : clone failed, errno = %d", errno);
- n = waitpid(pid, &status, WUNTRACED);
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("check_ptrace : wait failed, errno = %d", errno);
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
panic("check_ptrace : ptrace failed, errno = %d", errno);
- n = waitpid(pid, &status, 0);
+ CATCH_EINTR(n = waitpid(pid, &status, 0));
if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode))
panic("check_ptrace : child exited with status 0x%x", status);
panic("check_ptrace : munmap failed, errno = %d", errno);
}
+static int force_sysemu_disabled = 0;
+
+static int __init nosysemu_cmd_param(char *str, int* add)
+{
+ force_sysemu_disabled = 1;
+ return 0;
+}
+
+__uml_setup("nosysemu", nosysemu_cmd_param,
+ "nosysemu\n"
+ " Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
+ " SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
+ " behaviour of ptrace() and helps reducing host context switch rate.\n"
+ " To make it working, you need a kernel patch for your host, too.\n"
+ " See http://perso.wanadoo.fr/laurent.vivier/UML/ for further information.\n");
+
+static void __init check_sysemu(void)
+{
+ void *stack;
+ int pid, n, status;
+
+ if (mode_tt)
+ return;
+
+ printk("Checking syscall emulation patch for ptrace...");
+ sysemu_supported = 0;
+ pid = start_ptraced_child(&stack);
+ if(ptrace(PTRACE_SYSEMU, pid, 0, 0) >= 0) {
+ struct user_regs_struct regs;
+
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if (n < 0)
+ panic("check_ptrace : wait failed, errno = %d", errno);
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
+ panic("check_ptrace : expected SIGTRAP, "
+ "got status = %d", status);
+
+ if (ptrace(PTRACE_GETREGS, pid, 0, ®s) < 0)
+ panic("check_ptrace : failed to read child "
+ "registers, errno = %d", errno);
+ regs.orig_eax = pid;
+ if (ptrace(PTRACE_SETREGS, pid, 0, ®s) < 0)
+ panic("check_ptrace : failed to modify child "
+ "registers, errno = %d", errno);
+
+ stop_ptraced_child(pid, stack, 0);
+
+ sysemu_supported = 1;
+ printk("found\n");
+ }
+ else
+ {
+ stop_ptraced_child(pid, stack, 1);
+ sysemu_supported = 0;
+ printk("missing\n");
+ }
+
+ set_using_sysemu(!force_sysemu_disabled);
+}
+
void __init check_ptrace(void)
{
void *stack;
if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
panic("check_ptrace : ptrace failed, errno = %d",
errno);
- n = waitpid(pid, &status, WUNTRACED);
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("check_ptrace : wait failed, errno = %d", errno);
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
}
stop_ptraced_child(pid, stack, 0);
printk("OK\n");
+ check_sysemu();
}
int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
{
- jmp_buf buf;
+ sigjmp_buf buf;
int n;
*jmp_ptr = &buf;
- n = setjmp(buf);
+ n = sigsetjmp(buf, 1);
if(n != 0)
return(n);
(*fn)(arg);
stop_ptraced_child(pid, stack, 1);
printf("Checking for /proc/mm...");
- if(access("/proc/mm", W_OK)){
+ if(os_access("/proc/mm", OS_ACC_W_OK) < 0){
printf("not found\n");
ret = 0;
}