781a69617b
Defining C structures for the following objects: (1) Remote and local context (2) Stack of system call arguments / return values Change-Id: Iafbb6c795bd765e3c78c54a255d8a1e4d4536288
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
#include <libsyscall_intercept_hook_point.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <syscall.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include "../include/uprotocol.h"
|
|
#include "../include/uti.h"
|
|
#include "./archdep_uti.h"
|
|
|
|
static struct uti_desc uti_desc;
|
|
|
|
#define DEBUG_UTI
|
|
|
|
static int
|
|
hook(long syscall_number,
|
|
long arg0, long arg1,
|
|
long arg2, long arg3,
|
|
long arg4, long arg5,
|
|
long *result)
|
|
{
|
|
//return 1; /* debug */
|
|
int tid = uti_syscall0(__NR_gettid);
|
|
struct terminate_thread_desc term_desc;
|
|
unsigned long code;
|
|
int stack_top;
|
|
|
|
if (!uti_desc.start_syscall_intercept) {
|
|
return 1; /* System call isn't taken over */
|
|
}
|
|
if (tid != uti_desc.mck_tid) {
|
|
if (uti_desc.syscalls2 && syscall_number >= 0 && syscall_number < 512) {
|
|
uti_desc.syscalls2[syscall_number]++;
|
|
}
|
|
return 1;
|
|
}
|
|
#ifdef DEBUG_UTI
|
|
if (uti_desc.syscalls && syscall_number >= 0 && syscall_number < 512) {
|
|
uti_desc.syscalls[syscall_number]++;
|
|
}
|
|
#endif
|
|
|
|
switch (syscall_number) {
|
|
case __NR_gettid:
|
|
*result = uti_desc.mck_tid;
|
|
return 0;
|
|
case __NR_futex:
|
|
case __NR_brk:
|
|
case __NR_mmap:
|
|
case __NR_munmap:
|
|
case __NR_mprotect:
|
|
case __NR_mremap:
|
|
/* Overflow check */
|
|
if (uti_desc.syscall_stack_top == -1) {
|
|
*result = -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
/* Sanity check */
|
|
if (uti_desc.syscall_stack_top < 0 || uti_desc.syscall_stack_top >= UTI_SZ_SYSCALL_STACK) {
|
|
*result = -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/* Store the return value in the stack to prevent it from getting corrupted
|
|
when an interrupt happens just after ioctl() and before copying the return
|
|
value to *result */
|
|
stack_top = __sync_fetch_and_sub(&uti_desc.syscall_stack_top, 1);
|
|
|
|
uti_desc.syscall_stack[stack_top].number = syscall_number;
|
|
uti_desc.syscall_stack[stack_top].args[0] = arg0;
|
|
uti_desc.syscall_stack[stack_top].args[1] = arg1;
|
|
uti_desc.syscall_stack[stack_top].args[2] = arg2;
|
|
uti_desc.syscall_stack[stack_top].args[3] = arg3;
|
|
uti_desc.syscall_stack[stack_top].args[4] = arg4;
|
|
uti_desc.syscall_stack[stack_top].args[5] = arg5;
|
|
uti_desc.syscall_stack[stack_top].uti_clv = uti_desc.uti_clv;
|
|
uti_desc.syscall_stack[stack_top].ret = -EINVAL;
|
|
|
|
uti_syscall3(__NR_ioctl, uti_desc.fd, MCEXEC_UP_SYSCALL_THREAD, (long)(uti_desc.syscall_stack + stack_top));
|
|
*result = uti_desc.syscall_stack[stack_top].ret;
|
|
|
|
/* push syscall_struct list */
|
|
__sync_fetch_and_add(&uti_desc.syscall_stack_top, 1);
|
|
|
|
return 0; /* System call is taken over */
|
|
case __NR_exit_group:
|
|
code = 0x100000000;
|
|
goto make_remote_thread_exit;
|
|
case __NR_exit:
|
|
code = 0;
|
|
make_remote_thread_exit:
|
|
/* Make migrated-to-Linux thread on the McKernel side call do_exit() or terminate() */
|
|
term_desc.pid = uti_desc.pid;
|
|
term_desc.tid = uti_desc.tid; /* tid of mcexec */
|
|
term_desc.code = code | ((arg0 & 255) << 8);
|
|
term_desc.tsk = uti_desc.key;
|
|
|
|
uti_syscall3(__NR_ioctl, uti_desc.fd, MCEXEC_UP_TERMINATE_THREAD, (long)&term_desc);
|
|
return 1;
|
|
case __NR_clone:
|
|
case __NR_fork:
|
|
case __NR_vfork:
|
|
case __NR_execve:
|
|
*result = -ENOSYS;
|
|
return 0;
|
|
#if 0 /* debug */
|
|
case __NR_set_robust_list:
|
|
*result = -ENOSYS;
|
|
return 0;
|
|
#endif
|
|
case 888:
|
|
*result = (long)&uti_desc;
|
|
return 0;
|
|
default:
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __attribute__((constructor)) void
|
|
init(void)
|
|
{
|
|
/* Set up the callback function */
|
|
intercept_hook_point = hook;
|
|
|
|
/* Initialize uti_desc */
|
|
uti_desc.syscall_stack_top = UTI_SZ_SYSCALL_STACK - 1;
|
|
|
|
/* Pass address of uti_desc to McKernel */
|
|
uti_syscall1(733, (unsigned long)&uti_desc);
|
|
}
|
|
|
|
static __attribute__((destructor)) void
|
|
dtor(void)
|
|
{
|
|
}
|