/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2002 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
#include <signal.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 "user_util.h"
+#include "process.h"
+#include "irq_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
+
+#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
+#define COMM_SCANF "%*[^)])"
unsigned long os_process_pc(int pid)
{
- char proc_stat[sizeof("/proc/#####/stat\0")], buf[256];
+ char proc_stat[STAT_PATH_LEN], buf[256];
unsigned long pc;
- int fd;
+ int fd, err;
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', errno = %d\n",
- proc_stat, errno);
- return(-1);
+ printk("os_process_pc - couldn't open '%s', err = %d\n",
+ proc_stat, -fd);
+ return(ARBITRARY_ADDR);
}
- if(read(fd, buf, sizeof(buf)) < 0){
- printk("os_process_pc - couldn't read '%s', errno = %d\n",
- proc_stat, errno);
- close(fd);
- return(-1);
+ 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);
+ os_close_file(fd);
+ return(ARBITRARY_ADDR);
}
- close(fd);
- pc = -1;
- if(sscanf(buf, "%*d %*s %*c %*d %*d %*d %*d %*d %*d %*d %*d "
+ os_close_file(fd);
+ pc = ARBITRARY_ADDR;
+ 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 %ld", &pc) != 1){
+ "%*d %*d %*d %*d %*d %lu", &pc) != 1){
printk("os_process_pc - couldn't find pc in '%s'\n", buf);
}
return(pc);
int os_process_parent(int pid)
{
- char stat[sizeof("/proc/nnnnn/stat\0")];
+ char stat[STAT_PATH_LEN];
char data[256];
int parent, n, fd;
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', errno = %d\n", stat, -fd);
- return(-1);
+ printk("Couldn't open '%s', err = %d\n", stat, -fd);
+ return(FAILURE_PID);
}
- n = read(fd, data, sizeof(data));
- close(fd);
+ n = os_read_file(fd, data, sizeof(data));
+ os_close_file(fd);
if(n < 0){
- printk("Couldn't read '%s', errno = %d\n", stat);
- return(-1);
+ printk("Couldn't read '%s', err = %d\n", stat, -n);
+ return(FAILURE_PID);
}
- parent = -1;
- /* XXX This will break if there is a space in the command */
- n = sscanf(data, "%*d %*s %*c %d", &parent);
- if(n != 1) printk("Failed to scan '%s'\n", data);
+ parent = FAILURE_PID;
+ n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
+ if(n != 1)
+ printk("Failed to scan '%s'\n", data);
return(parent);
}
{
kill(pid, SIGKILL);
if(reap_child)
- waitpid(pid, NULL, 0);
+ 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,
+ * then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
+ * which it can't exit directly.
+ */
+
+void os_kill_ptraced_process(int pid, int reap_child)
+{
+ kill(pid, SIGKILL);
+ ptrace(PTRACE_KILL, pid);
+ ptrace(PTRACE_CONT, pid);
+ if(reap_child)
+ CATCH_EINTR(waitpid(pid, NULL, 0));
+}
+
void os_usr1_process(int pid)
{
kill(pid, SIGUSR1);
}
+/* 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)
{
- return(getpid());
+ return(syscall(__NR_getpid));
+}
+
+int os_getpgrp(void)
+{
+ return getpgrp();
}
-int os_map_memory(void *virt, int fd, unsigned long off, unsigned long len,
+int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
int r, int w, int x)
{
void *loc;
prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
(x ? PROT_EXEC : 0);
- loc = mmap((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
- fd, off);
+ loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
+ fd, off);
if(loc == MAP_FAILED)
return(-errno);
return(0);
int err;
err = munmap(addr, len);
- if(err < 0) return(-errno);
+ 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 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(sig_stack != NULL){
+ pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
+ set_sigstack(sig_stack, pages * page_size());
+ flags = SA_ONSTACK;
+ }
+ if(usr1_handler){
+ struct sigaction sa;
+
+ sa.sa_handler = usr1_handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = flags;
+ sa.sa_restorer = NULL;
+ if(sigaction(SIGUSR1, &sa, NULL) < 0)
+ panic("init_new_thread_stack - sigaction failed - "
+ "errno = %d\n", errno);
+ }
+}
+
+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);
+ set_handler(SIGUSR2, (__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://git.onelab.eu / linux-2.6.git / blobdiff