-/*
- * Copyright (C) 2002 Jeff Dike (jdike@addtoit.com)
+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
-#include <unistd.h>
#include <stdio.h>
+#include <unistd.h>
#include <errno.h>
#include <signal.h>
-#include <linux/unistd.h>
#include <sys/mman.h>
+#include <sys/ptrace.h>
#include <sys/wait.h>
-#include "ptrace_user.h"
+#include <asm/unistd.h>
+#include "init.h"
+#include "kern_constants.h"
+#include "longjmp.h"
#include "os.h"
+#include "process.h"
+#include "skas_ptrace.h"
#include "user.h"
-#include "user_util.h"
#define ARBITRARY_ADDR -1
#define FAILURE_PID -1
sprintf(proc_stat, "/proc/%d/stat", pid);
fd = os_open_file(proc_stat, of_read(OPENFLAGS()), 0);
- if(fd < 0){
- printk("os_process_pc - couldn't open '%s', err = %d\n",
- proc_stat, -fd);
- return(ARBITRARY_ADDR);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
+ "err = %d\n", proc_stat, -fd);
+ return ARBITRARY_ADDR;
}
- err = os_read_file(fd, buf, sizeof(buf));
- if(err < 0){
- printk("os_process_pc - couldn't read '%s', err = %d\n",
- proc_stat, -err);
+ CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
+ if (err < 0) {
+ printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
+ "err = %d\n", proc_stat, errno);
os_close_file(fd);
- return(ARBITRARY_ADDR);
+ return ARBITRARY_ADDR;
}
os_close_file(fd);
pc = ARBITRARY_ADDR;
- if(sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
+ if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
- "%*d %*d %*d %*d %*d %lu", &pc) != 1){
- printk("os_process_pc - couldn't find pc in '%s'\n", buf);
+ "%*d %*d %*d %*d %*d %lu", &pc) != 1) {
+ printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
+ buf);
}
- return(pc);
+ return pc;
}
int os_process_parent(int pid)
char data[256];
int parent, n, fd;
- if(pid == -1) return(-1);
+ if (pid == -1)
+ return -1;
snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
fd = os_open_file(stat, of_read(OPENFLAGS()), 0);
- if(fd < 0){
- printk("Couldn't open '%s', err = %d\n", stat, -fd);
- return(FAILURE_PID);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "Couldn't open '%s', err = %d\n", stat, -fd);
+ return FAILURE_PID;
}
- n = os_read_file(fd, data, sizeof(data));
+ CATCH_EINTR(n = read(fd, data, sizeof(data)));
os_close_file(fd);
- if(n < 0){
- printk("Couldn't read '%s', err = %d\n", stat, -n);
- return(FAILURE_PID);
+ if (n < 0) {
+ printk(UM_KERN_ERR "Couldn't read '%s', err = %d\n", stat,
+ errno);
+ return FAILURE_PID;
}
parent = FAILURE_PID;
n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
- if(n != 1)
- printk("Failed to scan '%s'\n", data);
+ if (n != 1)
+ printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
- return(parent);
+ return parent;
}
void os_stop_process(int pid)
void os_kill_process(int pid, int reap_child)
{
kill(pid, SIGKILL);
- if(reap_child)
+ if (reap_child)
CATCH_EINTR(waitpid(pid, NULL, 0));
-
+}
+
+/* This is here uniquely to have access to the userspace errno, i.e. the one
+ * used by ptrace in case of error.
+ */
+
+long os_ptrace_ldt(long pid, long addr, long data)
+{
+ int ret;
+
+ ret = ptrace(PTRACE_LDT, pid, addr, data);
+
+ if (ret < 0)
+ return -errno;
+ return ret;
}
/* Kill off a ptraced child by all means available. kill it normally first,
kill(pid, SIGKILL);
ptrace(PTRACE_KILL, pid);
ptrace(PTRACE_CONT, pid);
- if(reap_child)
+ if (reap_child)
CATCH_EINTR(waitpid(pid, NULL, 0));
}
-void os_usr1_process(int pid)
+/* Don't use the glibc version, which caches the result in TLS. It misses some
+ * syscalls, and also breaks with clone(), which does not unshare the TLS.
+ */
+
+int os_getpid(void)
{
- kill(pid, SIGUSR1);
+ return syscall(__NR_getpid);
}
-/*Don't use the glibc version, which caches the result in TLS. It misses some
- * syscalls, and also breaks with clone(), which does not unshare the TLS.*/
-inline _syscall0(pid_t, getpid)
-
-int os_getpid(void)
+int os_getpgrp(void)
{
- return(getpid());
+ return getpgrp();
}
int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
void *loc;
int prot;
- prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
fd, off);
- if(loc == MAP_FAILED)
- return(-errno);
- return(0);
+ if (loc == MAP_FAILED)
+ return -errno;
+ return 0;
}
int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
{
- int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0));
- if(mprotect(addr, len, prot) < 0)
- return(-errno);
- return(0);
+ if (mprotect(addr, len, prot) < 0)
+ return -errno;
+
+ return 0;
}
int os_unmap_memory(void *addr, int len)
{
- int err;
+ int err;
- err = munmap(addr, len);
- if(err < 0)
- return(-errno);
- return(0);
+ err = munmap(addr, len);
+ if (err < 0)
+ return -errno;
+ return 0;
}
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
+#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 __init can_drop_memory(void)
+{
+ void *addr;
+ int fd, ok = 0;
+
+ printk(UM_KERN_INFO "Checking host MADV_REMOVE support...");
+ fd = create_mem_file(UM_KERN_PAGE_SIZE);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "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(UM_KERN_ERR "Mapping test memory file failed, "
+ "err = %d\n", -errno);
+ goto out_close;
+ }
+
+ if (madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0) {
+ printk(UM_KERN_ERR "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_signals(void)
+{
+ set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
+ SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
+ signal(SIGHUP, SIG_IGN);
+
+ init_irq_signals(1);
+}
+
+int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
+{
+ jmp_buf buf;
+ int n;
+
+ *jmp_ptr = &buf;
+ n = UML_SETJMP(&buf);
+ if (n != 0)
+ return n;
+ (*fn)(arg);
+ return 0;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff