#include <linux/unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
-#include <sys/mman.h>
+#include <sys/syscall.h>
#include "ptrace_user.h"
#include "os.h"
#include "user.h"
#include "kern_util.h"
#include "longjmp.h"
#include "skas_ptrace.h"
-#include "kern_constants.h"
#define ARBITRARY_ADDR -1
#define FAILURE_PID -1
int os_getpid(void)
{
- return syscall(__NR_getpid);
+ return(syscall(__NR_getpid));
}
int os_getpgrp(void)
return(0);
}
-#ifndef MADV_REMOVE
-#define MADV_REMOVE KERNEL_MADV_REMOVE
-#endif
-
-int os_drop_memory(void *addr, int length)
-{
- int err;
-
- err = madvise(addr, length, MADV_REMOVE);
- if(err < 0)
- err = -errno;
- return err;
-}
-
-int can_drop_memory(void)
-{
- void *addr;
- int fd, ok = 0;
-
- printk("Checking host MADV_REMOVE support...");
- fd = create_mem_file(UM_KERN_PAGE_SIZE);
- if(fd < 0){
- printk("Creating test memory file failed, err = %d\n", -fd);
- goto out;
- }
-
- addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
- MAP_SHARED, fd, 0);
- if(addr == MAP_FAILED){
- printk("Mapping test memory file failed, err = %d\n", -errno);
- goto out_close;
- }
-
- if(madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0){
- printk("MADV_REMOVE failed, err = %d\n", -errno);
- goto out_unmap;
- }
-
- printk("OK\n");
- ok = 1;
-
-out_unmap:
- munmap(addr, UM_KERN_PAGE_SIZE);
-out_close:
- close(fd);
-out:
- return ok;
-}
-
void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
{
int flags = 0, pages;
if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
}
-void init_new_thread_signals(void)
+void init_new_thread_signals(int altstack)
{
- set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
+ int flags = altstack ? SA_ONSTACK : 0;
+
+ set_handler(SIGSEGV, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
+ set_handler(SIGTRAP, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
+ set_handler(SIGFPE, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
+ set_handler(SIGILL, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
+ set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGUSR2, (__sighandler_t) sig_handler,
- SA_ONSTACK, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
- -1);
+ flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
signal(SIGHUP, SIG_IGN);
- init_irq_signals(1);
+ init_irq_signals(altstack);
}
int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
{
- jmp_buf buf;
- int n;
+ sigjmp_buf buf;
+ int n, enable;
*jmp_ptr = &buf;
- n = UML_SETJMP(&buf);
+ n = UML_SIGSETJMP(&buf, enable);
if(n != 0)
- return n;
+ return(n);
(*fn)(arg);
- return 0;
+ return(0);
}