target_ulong calc_retaddr_linux_arm(CPUState* env, target_ulong pc) {
#if defined(TARGET_ARM)
// Normal syscalls: return addr is stored in LR
// Except that we haven't run the SWI instruction yet! LR is where libc will return to!
//return mask_retaddr_to_pc(env->regs[14]);
// Fork, exec
uint8_t offset = 0;
if(env->thumb == 0){
offset = 4;
} else {
offset = 2;
}
return mask_retaddr_to_pc(pc + offset);
#else
// shouldnt happen
assert (1==0);
#endif
}
static target_ulong calc_retaddr(CPUState* env, target_ulong pc){
#if defined(TARGET_ARM)
// Normal syscalls: return addr is stored in LR
// Except that we haven't run the SWI instruction yet! LR is where libc will return to!
//return mask_retaddr_to_pc(env->regs[14]);
// Fork, exec
uint8_t offset = 0;
if(env->thumb == 0){
offset = 4;
} else {
offset = 2;
}
return mask_retaddr_to_pc(pc + offset);
#elif defined(TARGET_I386)
// syscall and sysenter x86 instructions are both 2 bytes
// on linux this is true. different for different systems.
return pc+11;
/*// ABI from http://wiki.osdev.org/SYSENTER
// Return address is set by user code before the syscall/sysenter instr is executed
unsigned char buf[2];
panda_virtual_memory_rw(env, pc, buf, 2, 0);
// Check if the instruction is syscall (0F 05)
if (buf[0]== 0x0F && buf[1] == 0x05) {
return ECX;
}
// Check if the instruction is sysenter (0F 34)
else if (buf[0]== 0x0F && buf[1] == 0x34) {
return EDX;
}
else {
// Not a syscall or sysenter!?
assert(0);
}*/
#else
#error "return address calculation not implemented for this architecture in fdtracker"
#endif
}
static void vmi_do_mmap2_callback(CPUState *env, target_ulong pc,
uint32_t addr,uint32_t len,uint32_t prot,uint32_t flags,uint32_t fd,uint32_t pgoff)
{
mmap_returns.push_back(ReturnPoint(mask_retaddr_to_pc(env->regs[14]), get_asid(env, pc)));
}
static void vmi_sys_prctl_callback(CPUState *env, target_ulong pc,
uint32_t option,uint32_t arg2,uint32_t arg3,uint32_t arg4,uint32_t arg5)
{
prctl_returns.push_back(ReturnPoint(mask_retaddr_to_pc(env->regs[14]), get_asid(env, pc)));
}
static void vmi_clone_callback(CPUState* env,target_ulong pc,uint32_t clone_flags,uint32_t newsp,
target_ulong parent_tidptr,int32_t tls_val,
target_ulong child_tidptr,target_ulong regs)
{
clone_returns.push_back(ReturnPoint(mask_retaddr_to_pc(env->regs[14]), get_asid(env, pc)));
}
