295 lines
6.3 KiB
C
295 lines
6.3 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include "ptrace_user.h"
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#include "os.h"
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#include "user.h"
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#include "user_util.h"
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#include "process.h"
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#include "irq_user.h"
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#include "kern_util.h"
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#include "longjmp.h"
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#include "skas_ptrace.h"
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#include "kern_constants.h"
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#include "uml-config.h"
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#define ARBITRARY_ADDR -1
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#define FAILURE_PID -1
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#define STAT_PATH_LEN sizeof("/proc/#######/stat\0")
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#define COMM_SCANF "%*[^)])"
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unsigned long os_process_pc(int pid)
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{
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char proc_stat[STAT_PATH_LEN], buf[256];
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unsigned long pc;
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int fd, err;
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sprintf(proc_stat, "/proc/%d/stat", pid);
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fd = os_open_file(proc_stat, of_read(OPENFLAGS()), 0);
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if(fd < 0){
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printk("os_process_pc - couldn't open '%s', err = %d\n",
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proc_stat, -fd);
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return(ARBITRARY_ADDR);
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}
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err = os_read_file(fd, buf, sizeof(buf));
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if(err < 0){
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printk("os_process_pc - couldn't read '%s', err = %d\n",
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proc_stat, -err);
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os_close_file(fd);
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return(ARBITRARY_ADDR);
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}
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os_close_file(fd);
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pc = ARBITRARY_ADDR;
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if(sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
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"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
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"%*d %*d %*d %*d %*d %lu", &pc) != 1){
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printk("os_process_pc - couldn't find pc in '%s'\n", buf);
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}
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return(pc);
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}
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int os_process_parent(int pid)
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{
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char stat[STAT_PATH_LEN];
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char data[256];
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int parent, n, fd;
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if(pid == -1) return(-1);
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snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
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fd = os_open_file(stat, of_read(OPENFLAGS()), 0);
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if(fd < 0){
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printk("Couldn't open '%s', err = %d\n", stat, -fd);
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return(FAILURE_PID);
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}
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n = os_read_file(fd, data, sizeof(data));
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os_close_file(fd);
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if(n < 0){
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printk("Couldn't read '%s', err = %d\n", stat, -n);
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return(FAILURE_PID);
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}
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parent = FAILURE_PID;
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n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
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if(n != 1)
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printk("Failed to scan '%s'\n", data);
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return(parent);
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}
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void os_stop_process(int pid)
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{
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kill(pid, SIGSTOP);
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}
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void os_kill_process(int pid, int reap_child)
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{
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kill(pid, SIGKILL);
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if(reap_child)
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CATCH_EINTR(waitpid(pid, NULL, 0));
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}
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/* This is here uniquely to have access to the userspace errno, i.e. the one
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* used by ptrace in case of error.
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*/
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long os_ptrace_ldt(long pid, long addr, long data)
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{
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int ret;
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ret = ptrace(PTRACE_LDT, pid, addr, data);
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if (ret < 0)
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return -errno;
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return ret;
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}
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/* Kill off a ptraced child by all means available. kill it normally first,
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* then PTRACE_KILL it, then PTRACE_CONT it in case it's in a run state from
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* which it can't exit directly.
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*/
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void os_kill_ptraced_process(int pid, int reap_child)
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{
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kill(pid, SIGKILL);
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ptrace(PTRACE_KILL, pid);
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ptrace(PTRACE_CONT, pid);
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if(reap_child)
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CATCH_EINTR(waitpid(pid, NULL, 0));
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}
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#ifdef UML_CONFIG_MODE_TT
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void os_usr1_process(int pid)
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{
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kill(pid, SIGUSR1);
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}
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#endif
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/* Don't use the glibc version, which caches the result in TLS. It misses some
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* syscalls, and also breaks with clone(), which does not unshare the TLS.
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*/
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int os_getpid(void)
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{
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return(syscall(__NR_getpid));
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}
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int os_getpgrp(void)
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{
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return getpgrp();
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}
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int os_map_memory(void *virt, int fd, unsigned long long off, unsigned long len,
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int r, int w, int x)
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{
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void *loc;
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int prot;
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prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
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(x ? PROT_EXEC : 0);
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loc = mmap64((void *) virt, len, prot, MAP_SHARED | MAP_FIXED,
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fd, off);
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if(loc == MAP_FAILED)
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return(-errno);
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return(0);
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}
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int os_protect_memory(void *addr, unsigned long len, int r, int w, int x)
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{
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int prot = ((r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
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(x ? PROT_EXEC : 0));
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if(mprotect(addr, len, prot) < 0)
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return(-errno);
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return(0);
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}
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int os_unmap_memory(void *addr, int len)
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{
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int err;
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err = munmap(addr, len);
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if(err < 0)
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return(-errno);
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return(0);
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}
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#ifndef MADV_REMOVE
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#define MADV_REMOVE KERNEL_MADV_REMOVE
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#endif
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int os_drop_memory(void *addr, int length)
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{
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int err;
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err = madvise(addr, length, MADV_REMOVE);
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if(err < 0)
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err = -errno;
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return err;
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}
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int can_drop_memory(void)
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{
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void *addr;
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int fd, ok = 0;
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printk("Checking host MADV_REMOVE support...");
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fd = create_mem_file(UM_KERN_PAGE_SIZE);
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if(fd < 0){
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printk("Creating test memory file failed, err = %d\n", -fd);
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goto out;
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}
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addr = mmap64(NULL, UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, 0);
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if(addr == MAP_FAILED){
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printk("Mapping test memory file failed, err = %d\n", -errno);
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goto out_close;
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}
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if(madvise(addr, UM_KERN_PAGE_SIZE, MADV_REMOVE) != 0){
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printk("MADV_REMOVE failed, err = %d\n", -errno);
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goto out_unmap;
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}
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printk("OK\n");
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ok = 1;
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out_unmap:
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munmap(addr, UM_KERN_PAGE_SIZE);
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out_close:
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close(fd);
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out:
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return ok;
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}
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void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
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{
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int flags = 0, pages;
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if(sig_stack != NULL){
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pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
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set_sigstack(sig_stack, pages * page_size());
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flags = SA_ONSTACK;
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}
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if(usr1_handler){
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struct sigaction sa;
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sa.sa_handler = usr1_handler;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = flags;
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sa.sa_restorer = NULL;
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if(sigaction(SIGUSR1, &sa, NULL) < 0)
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panic("init_new_thread_stack - sigaction failed - "
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"errno = %d\n", errno);
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}
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}
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void init_new_thread_signals(void)
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{
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set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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set_handler(SIGTRAP, (__sighandler_t) sig_handler, SA_ONSTACK,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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set_handler(SIGFPE, (__sighandler_t) sig_handler, SA_ONSTACK,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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set_handler(SIGILL, (__sighandler_t) sig_handler, SA_ONSTACK,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
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SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
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set_handler(SIGUSR2, (__sighandler_t) sig_handler,
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SA_ONSTACK, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
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-1);
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signal(SIGHUP, SIG_IGN);
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init_irq_signals(1);
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}
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int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
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{
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jmp_buf buf;
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int n;
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*jmp_ptr = &buf;
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n = UML_SETJMP(&buf);
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if(n != 0)
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return n;
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(*fn)(arg);
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return 0;
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}
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