mirror of https://gitee.com/openkylin/linux.git
548 lines
14 KiB
C
548 lines
14 KiB
C
/*
|
|
* Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <sched.h>
|
|
#include "ptrace_user.h"
|
|
#include <sys/wait.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/user.h>
|
|
#include <sys/time.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/types.h>
|
|
#include "user.h"
|
|
#include "sysdep/ptrace.h"
|
|
#include "user_util.h"
|
|
#include "kern_util.h"
|
|
#include "skas.h"
|
|
#include "stub-data.h"
|
|
#include "mm_id.h"
|
|
#include "sysdep/sigcontext.h"
|
|
#include "sysdep/stub.h"
|
|
#include "os.h"
|
|
#include "proc_mm.h"
|
|
#include "skas_ptrace.h"
|
|
#include "chan_user.h"
|
|
#include "registers.h"
|
|
#include "mem.h"
|
|
#include "uml-config.h"
|
|
#include "process.h"
|
|
#include "longjmp.h"
|
|
|
|
int is_skas_winch(int pid, int fd, void *data)
|
|
{
|
|
if(pid != os_getpgrp())
|
|
return(0);
|
|
|
|
register_winch_irq(-1, fd, -1, data);
|
|
return(1);
|
|
}
|
|
|
|
void wait_stub_done(int pid, int sig, char * fname)
|
|
{
|
|
int n, status, err;
|
|
|
|
do {
|
|
if ( sig != -1 ) {
|
|
err = ptrace(PTRACE_CONT, pid, 0, sig);
|
|
if(err)
|
|
panic("%s : continue failed, errno = %d\n",
|
|
fname, errno);
|
|
}
|
|
sig = 0;
|
|
|
|
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
|
|
} while((n >= 0) && WIFSTOPPED(status) &&
|
|
((WSTOPSIG(status) == SIGVTALRM) ||
|
|
/* running UML inside a detached screen can cause
|
|
* SIGWINCHes
|
|
*/
|
|
(WSTOPSIG(status) == SIGWINCH)));
|
|
|
|
if((n < 0) || !WIFSTOPPED(status) ||
|
|
(WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
|
|
unsigned long regs[HOST_FRAME_SIZE];
|
|
|
|
if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
|
|
printk("Failed to get registers from stub, "
|
|
"errno = %d\n", errno);
|
|
else {
|
|
int i;
|
|
|
|
printk("Stub registers -\n");
|
|
for(i = 0; i < HOST_FRAME_SIZE; i++)
|
|
printk("\t%d - %lx\n", i, regs[i]);
|
|
}
|
|
panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
|
|
"pid = %d, n = %d, errno = %d, status = 0x%x\n",
|
|
fname, pid, n, errno, status);
|
|
}
|
|
}
|
|
|
|
extern unsigned long current_stub_stack(void);
|
|
|
|
void get_skas_faultinfo(int pid, struct faultinfo * fi)
|
|
{
|
|
int err;
|
|
|
|
if(ptrace_faultinfo){
|
|
err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
|
|
if(err)
|
|
panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
|
|
"errno = %d\n", errno);
|
|
|
|
/* Special handling for i386, which has different structs */
|
|
if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
|
|
memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
|
|
sizeof(struct faultinfo) -
|
|
sizeof(struct ptrace_faultinfo));
|
|
}
|
|
else {
|
|
wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo");
|
|
|
|
/* faultinfo is prepared by the stub-segv-handler at start of
|
|
* the stub stack page. We just have to copy it.
|
|
*/
|
|
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
|
|
}
|
|
}
|
|
|
|
static void handle_segv(int pid, union uml_pt_regs * regs)
|
|
{
|
|
get_skas_faultinfo(pid, ®s->skas.faultinfo);
|
|
segv(regs->skas.faultinfo, 0, 1, NULL);
|
|
}
|
|
|
|
/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
|
|
static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
|
|
{
|
|
int err, status;
|
|
|
|
/* Mark this as a syscall */
|
|
UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
|
|
|
|
if (!local_using_sysemu)
|
|
{
|
|
err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
|
|
__NR_getpid);
|
|
if(err < 0)
|
|
panic("handle_trap - nullifying syscall failed errno = %d\n",
|
|
errno);
|
|
|
|
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
|
|
if(err < 0)
|
|
panic("handle_trap - continuing to end of syscall failed, "
|
|
"errno = %d\n", errno);
|
|
|
|
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
|
|
if((err < 0) || !WIFSTOPPED(status) ||
|
|
(WSTOPSIG(status) != SIGTRAP + 0x80))
|
|
panic("handle_trap - failed to wait at end of syscall, "
|
|
"errno = %d, status = %d\n", errno, status);
|
|
}
|
|
|
|
handle_syscall(regs);
|
|
}
|
|
|
|
extern int __syscall_stub_start;
|
|
|
|
static int userspace_tramp(void *stack)
|
|
{
|
|
void *addr;
|
|
int err;
|
|
|
|
ptrace(PTRACE_TRACEME, 0, 0, 0);
|
|
|
|
init_new_thread_signals();
|
|
err = set_interval(1);
|
|
if(err)
|
|
panic("userspace_tramp - setting timer failed, errno = %d\n",
|
|
err);
|
|
|
|
if(!proc_mm){
|
|
/* This has a pte, but it can't be mapped in with the usual
|
|
* tlb_flush mechanism because this is part of that mechanism
|
|
*/
|
|
int fd;
|
|
__u64 offset;
|
|
fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
|
|
addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
|
|
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
|
|
if(addr == MAP_FAILED){
|
|
printk("mapping mmap stub failed, errno = %d\n",
|
|
errno);
|
|
exit(1);
|
|
}
|
|
|
|
if(stack != NULL){
|
|
fd = phys_mapping(to_phys(stack), &offset);
|
|
addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
|
|
PROT_READ | PROT_WRITE,
|
|
MAP_FIXED | MAP_SHARED, fd, offset);
|
|
if(addr == MAP_FAILED){
|
|
printk("mapping segfault stack failed, "
|
|
"errno = %d\n", errno);
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
if(!ptrace_faultinfo && (stack != NULL)){
|
|
struct sigaction sa;
|
|
|
|
unsigned long v = UML_CONFIG_STUB_CODE +
|
|
(unsigned long) stub_segv_handler -
|
|
(unsigned long) &__syscall_stub_start;
|
|
|
|
set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
|
|
sigemptyset(&sa.sa_mask);
|
|
sigaddset(&sa.sa_mask, SIGIO);
|
|
sigaddset(&sa.sa_mask, SIGWINCH);
|
|
sigaddset(&sa.sa_mask, SIGALRM);
|
|
sigaddset(&sa.sa_mask, SIGVTALRM);
|
|
sigaddset(&sa.sa_mask, SIGUSR1);
|
|
sa.sa_flags = SA_ONSTACK;
|
|
sa.sa_handler = (void *) v;
|
|
sa.sa_restorer = NULL;
|
|
if(sigaction(SIGSEGV, &sa, NULL) < 0)
|
|
panic("userspace_tramp - setting SIGSEGV handler "
|
|
"failed - errno = %d\n", errno);
|
|
}
|
|
|
|
os_stop_process(os_getpid());
|
|
return(0);
|
|
}
|
|
|
|
/* Each element set once, and only accessed by a single processor anyway */
|
|
#undef NR_CPUS
|
|
#define NR_CPUS 1
|
|
int userspace_pid[NR_CPUS];
|
|
|
|
int start_userspace(unsigned long stub_stack)
|
|
{
|
|
void *stack;
|
|
unsigned long sp;
|
|
int pid, status, n, flags;
|
|
|
|
stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
if(stack == MAP_FAILED)
|
|
panic("start_userspace : mmap failed, errno = %d", errno);
|
|
sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
|
|
|
|
flags = CLONE_FILES | SIGCHLD;
|
|
if(proc_mm) flags |= CLONE_VM;
|
|
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
|
|
if(pid < 0)
|
|
panic("start_userspace : clone failed, errno = %d", errno);
|
|
|
|
do {
|
|
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
|
|
if(n < 0)
|
|
panic("start_userspace : wait failed, errno = %d",
|
|
errno);
|
|
} while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
|
|
|
|
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
|
|
panic("start_userspace : expected SIGSTOP, got status = %d",
|
|
status);
|
|
|
|
if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
|
|
panic("start_userspace : PTRACE_OLDSETOPTIONS failed, errno=%d\n",
|
|
errno);
|
|
|
|
if(munmap(stack, PAGE_SIZE) < 0)
|
|
panic("start_userspace : munmap failed, errno = %d\n", errno);
|
|
|
|
return(pid);
|
|
}
|
|
|
|
void userspace(union uml_pt_regs *regs)
|
|
{
|
|
int err, status, op, pid = userspace_pid[0];
|
|
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
|
|
|
|
while(1){
|
|
restore_registers(pid, regs);
|
|
|
|
/* Now we set local_using_sysemu to be used for one loop */
|
|
local_using_sysemu = get_using_sysemu();
|
|
|
|
op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
|
|
|
|
err = ptrace(op, pid, 0, 0);
|
|
if(err)
|
|
panic("userspace - could not resume userspace process, "
|
|
"pid=%d, ptrace operation = %d, errno = %d\n",
|
|
pid, op, errno);
|
|
|
|
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
|
|
if(err < 0)
|
|
panic("userspace - waitpid failed, errno = %d\n",
|
|
errno);
|
|
|
|
regs->skas.is_user = 1;
|
|
save_registers(pid, regs);
|
|
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
|
|
|
|
if(WIFSTOPPED(status)){
|
|
switch(WSTOPSIG(status)){
|
|
case SIGSEGV:
|
|
if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo)
|
|
user_signal(SIGSEGV, regs, pid);
|
|
else handle_segv(pid, regs);
|
|
break;
|
|
case SIGTRAP + 0x80:
|
|
handle_trap(pid, regs, local_using_sysemu);
|
|
break;
|
|
case SIGTRAP:
|
|
relay_signal(SIGTRAP, regs);
|
|
break;
|
|
case SIGIO:
|
|
case SIGVTALRM:
|
|
case SIGILL:
|
|
case SIGBUS:
|
|
case SIGFPE:
|
|
case SIGWINCH:
|
|
user_signal(WSTOPSIG(status), regs, pid);
|
|
break;
|
|
default:
|
|
printk("userspace - child stopped with signal "
|
|
"%d\n", WSTOPSIG(status));
|
|
}
|
|
pid = userspace_pid[0];
|
|
interrupt_end();
|
|
|
|
/* Avoid -ERESTARTSYS handling in host */
|
|
if(PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
|
|
PT_SYSCALL_NR(regs->skas.regs) = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
int copy_context_skas0(unsigned long new_stack, int pid)
|
|
{
|
|
int err;
|
|
unsigned long regs[HOST_FRAME_SIZE];
|
|
unsigned long fp_regs[HOST_FP_SIZE];
|
|
unsigned long current_stack = current_stub_stack();
|
|
struct stub_data *data = (struct stub_data *) current_stack;
|
|
struct stub_data *child_data = (struct stub_data *) new_stack;
|
|
__u64 new_offset;
|
|
int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
|
|
|
|
/* prepare offset and fd of child's stack as argument for parent's
|
|
* and child's mmap2 calls
|
|
*/
|
|
*data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
|
|
.fd = new_fd,
|
|
.timer = ((struct itimerval)
|
|
{ { 0, 1000000 / hz() },
|
|
{ 0, 1000000 / hz() }})});
|
|
get_safe_registers(regs, fp_regs);
|
|
|
|
/* Set parent's instruction pointer to start of clone-stub */
|
|
regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
|
|
(unsigned long) stub_clone_handler -
|
|
(unsigned long) &__syscall_stub_start;
|
|
regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
|
|
sizeof(void *);
|
|
#ifdef __SIGNAL_FRAMESIZE
|
|
regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
|
|
#endif
|
|
err = ptrace_setregs(pid, regs);
|
|
if(err < 0)
|
|
panic("copy_context_skas0 : PTRACE_SETREGS failed, "
|
|
"pid = %d, errno = %d\n", pid, -err);
|
|
|
|
err = ptrace_setfpregs(pid, fp_regs);
|
|
if(err < 0)
|
|
panic("copy_context_skas0 : PTRACE_SETFPREGS failed, "
|
|
"pid = %d, errno = %d\n", pid, -err);
|
|
|
|
/* set a well known return code for detection of child write failure */
|
|
child_data->err = 12345678;
|
|
|
|
/* Wait, until parent has finished its work: read child's pid from
|
|
* parent's stack, and check, if bad result.
|
|
*/
|
|
wait_stub_done(pid, 0, "copy_context_skas0");
|
|
|
|
pid = data->err;
|
|
if(pid < 0)
|
|
panic("copy_context_skas0 - stub-parent reports error %d\n",
|
|
-pid);
|
|
|
|
/* Wait, until child has finished too: read child's result from
|
|
* child's stack and check it.
|
|
*/
|
|
wait_stub_done(pid, -1, "copy_context_skas0");
|
|
if (child_data->err != UML_CONFIG_STUB_DATA)
|
|
panic("copy_context_skas0 - stub-child reports error %ld\n",
|
|
child_data->err);
|
|
|
|
if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
|
|
(void *)PTRACE_O_TRACESYSGOOD) < 0)
|
|
panic("copy_context_skas0 : PTRACE_OLDSETOPTIONS failed, "
|
|
"errno = %d\n", errno);
|
|
|
|
return pid;
|
|
}
|
|
|
|
/*
|
|
* This is used only, if stub pages are needed, while proc_mm is
|
|
* availabl. Opening /proc/mm creates a new mm_context, which lacks
|
|
* the stub-pages. Thus, we map them using /proc/mm-fd
|
|
*/
|
|
void map_stub_pages(int fd, unsigned long code,
|
|
unsigned long data, unsigned long stack)
|
|
{
|
|
struct proc_mm_op mmop;
|
|
int n;
|
|
__u64 code_offset;
|
|
int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
|
|
&code_offset);
|
|
|
|
mmop = ((struct proc_mm_op) { .op = MM_MMAP,
|
|
.u =
|
|
{ .mmap =
|
|
{ .addr = code,
|
|
.len = PAGE_SIZE,
|
|
.prot = PROT_EXEC,
|
|
.flags = MAP_FIXED | MAP_PRIVATE,
|
|
.fd = code_fd,
|
|
.offset = code_offset
|
|
} } });
|
|
n = os_write_file(fd, &mmop, sizeof(mmop));
|
|
if(n != sizeof(mmop))
|
|
panic("map_stub_pages : /proc/mm map for code failed, "
|
|
"err = %d\n", -n);
|
|
|
|
if ( stack ) {
|
|
__u64 map_offset;
|
|
int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
|
|
mmop = ((struct proc_mm_op)
|
|
{ .op = MM_MMAP,
|
|
.u =
|
|
{ .mmap =
|
|
{ .addr = data,
|
|
.len = PAGE_SIZE,
|
|
.prot = PROT_READ | PROT_WRITE,
|
|
.flags = MAP_FIXED | MAP_SHARED,
|
|
.fd = map_fd,
|
|
.offset = map_offset
|
|
} } });
|
|
n = os_write_file(fd, &mmop, sizeof(mmop));
|
|
if(n != sizeof(mmop))
|
|
panic("map_stub_pages : /proc/mm map for data failed, "
|
|
"err = %d\n", -n);
|
|
}
|
|
}
|
|
|
|
void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
|
|
{
|
|
(*buf)[0].JB_IP = (unsigned long) handler;
|
|
(*buf)[0].JB_SP = (unsigned long) stack +
|
|
(PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) - sizeof(void *);
|
|
}
|
|
|
|
#define INIT_JMP_NEW_THREAD 0
|
|
#define INIT_JMP_CALLBACK 1
|
|
#define INIT_JMP_HALT 2
|
|
#define INIT_JMP_REBOOT 3
|
|
|
|
void switch_threads(jmp_buf *me, jmp_buf *you)
|
|
{
|
|
if(UML_SETJMP(me) == 0)
|
|
UML_LONGJMP(you, 1);
|
|
}
|
|
|
|
static jmp_buf initial_jmpbuf;
|
|
|
|
/* XXX Make these percpu */
|
|
static void (*cb_proc)(void *arg);
|
|
static void *cb_arg;
|
|
static jmp_buf *cb_back;
|
|
|
|
int start_idle_thread(void *stack, jmp_buf *switch_buf)
|
|
{
|
|
int n;
|
|
|
|
set_handler(SIGWINCH, (__sighandler_t) sig_handler,
|
|
SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
|
|
SIGVTALRM, -1);
|
|
|
|
n = UML_SETJMP(&initial_jmpbuf);
|
|
switch(n){
|
|
case INIT_JMP_NEW_THREAD:
|
|
(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
|
|
(*switch_buf)[0].JB_SP = (unsigned long) stack +
|
|
(PAGE_SIZE << UML_CONFIG_KERNEL_STACK_ORDER) -
|
|
sizeof(void *);
|
|
break;
|
|
case INIT_JMP_CALLBACK:
|
|
(*cb_proc)(cb_arg);
|
|
UML_LONGJMP(cb_back, 1);
|
|
break;
|
|
case INIT_JMP_HALT:
|
|
kmalloc_ok = 0;
|
|
return(0);
|
|
case INIT_JMP_REBOOT:
|
|
kmalloc_ok = 0;
|
|
return(1);
|
|
default:
|
|
panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
|
|
}
|
|
UML_LONGJMP(switch_buf, 1);
|
|
}
|
|
|
|
void initial_thread_cb_skas(void (*proc)(void *), void *arg)
|
|
{
|
|
jmp_buf here;
|
|
|
|
cb_proc = proc;
|
|
cb_arg = arg;
|
|
cb_back = &here;
|
|
|
|
block_signals();
|
|
if(UML_SETJMP(&here) == 0)
|
|
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK);
|
|
unblock_signals();
|
|
|
|
cb_proc = NULL;
|
|
cb_arg = NULL;
|
|
cb_back = NULL;
|
|
}
|
|
|
|
void halt_skas(void)
|
|
{
|
|
block_signals();
|
|
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
|
|
}
|
|
|
|
void reboot_skas(void)
|
|
{
|
|
block_signals();
|
|
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
|
|
}
|
|
|
|
void switch_mm_skas(struct mm_id *mm_idp)
|
|
{
|
|
int err;
|
|
|
|
#warning need cpu pid in switch_mm_skas
|
|
if(proc_mm){
|
|
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
|
|
mm_idp->u.mm_fd);
|
|
if(err)
|
|
panic("switch_mm_skas - PTRACE_SWITCH_MM failed, "
|
|
"errno = %d\n", errno);
|
|
}
|
|
else userspace_pid[0] = mm_idp->u.pid;
|
|
}
|