int
linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
{
union {
struct linux_pt_reg reg;
struct linux_pt_fpreg fpreg;
struct linux_pt_fpxreg fpxreg;
} r;
union {
struct reg bsd_reg;
struct fpreg bsd_fpreg;
struct dbreg bsd_dbreg;
} u;
void *addr;
pid_t pid;
int error, req;
error = 0;
/* by default, just copy data intact */
req = uap->req;
pid = (pid_t)uap->pid;
addr = (void *)uap->addr;
switch (req) {
case PTRACE_TRACEME:
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
case PTRACE_KILL:
error = kern_ptrace(td, req, pid, addr, uap->data);
break;
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA: {
/* need to preserve return value */
int rval = td->td_retval[0];
error = kern_ptrace(td, req, pid, addr, 0);
if (error == 0)
error = copyout(td->td_retval, (void *)uap->data,
sizeof(l_int));
td->td_retval[0] = rval;
break;
}
case PTRACE_DETACH:
error = kern_ptrace(td, PT_DETACH, pid, (void *)1,
map_signum(uap->data));
break;
case PTRACE_SINGLESTEP:
case PTRACE_CONT:
error = kern_ptrace(td, req, pid, (void *)1,
map_signum(uap->data));
break;
case PTRACE_ATTACH:
error = kern_ptrace(td, PT_ATTACH, pid, addr, uap->data);
break;
case PTRACE_GETREGS:
/* Linux is using data where FreeBSD is using addr */
error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
if (error == 0) {
map_regs_to_linux(&u.bsd_reg, &r.reg);
error = copyout(&r.reg, (void *)uap->data,
sizeof(r.reg));
}
break;
case PTRACE_SETREGS:
/* Linux is using data where FreeBSD is using addr */
error = copyin((void *)uap->data, &r.reg, sizeof(r.reg));
if (error == 0) {
map_regs_from_linux(&u.bsd_reg, &r.reg);
error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
}
break;
case PTRACE_GETFPREGS:
/* Linux is using data where FreeBSD is using addr */
error = kern_ptrace(td, PT_GETFPREGS, pid, &u.bsd_fpreg, 0);
if (error == 0) {
map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg);
error = copyout(&r.fpreg, (void *)uap->data,
sizeof(r.fpreg));
}
break;
case PTRACE_SETFPREGS:
/* Linux is using data where FreeBSD is using addr */
error = copyin((void *)uap->data, &r.fpreg, sizeof(r.fpreg));
if (error == 0) {
map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg);
error = kern_ptrace(td, PT_SETFPREGS, pid,
&u.bsd_fpreg, 0);
}
break;
case PTRACE_SETFPXREGS:
#ifdef CPU_ENABLE_SSE
error = copyin((void *)uap->data, &r.fpxreg, sizeof(r.fpxreg));
if (error)
break;
#endif
/* FALL THROUGH */
case PTRACE_GETFPXREGS: {
#ifdef CPU_ENABLE_SSE
struct proc *p;
struct thread *td2;
if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) {
static int once = 0;
if (!once) {
printf("linux: savexmm != linux_pt_fpxreg\n");
once = 1;
}
error = EIO;
break;
}
if ((p = pfind(uap->pid)) == NULL) {
error = ESRCH;
break;
}
/* Exiting processes can't be debugged. */
if ((p->p_flag & P_WEXIT) != 0) {
error = ESRCH;
goto fail;
}
if ((error = p_candebug(td, p)) != 0)
goto fail;
/* System processes can't be debugged. */
if ((p->p_flag & P_SYSTEM) != 0) {
error = EINVAL;
goto fail;
}
/* not being traced... */
if ((p->p_flag & P_TRACED) == 0) {
error = EPERM;
goto fail;
}
/* not being traced by YOU */
if (p->p_pptr != td->td_proc) {
error = EBUSY;
goto fail;
}
/* not currently stopped */
if (!P_SHOULDSTOP(p) || (p->p_flag & P_WAITED) == 0) {
error = EBUSY;
goto fail;
}
if (req == PTRACE_GETFPXREGS) {
_PHOLD(p); /* may block */
td2 = FIRST_THREAD_IN_PROC(p);
error = linux_proc_read_fpxregs(td2, &r.fpxreg);
_PRELE(p);
PROC_UNLOCK(p);
if (error == 0)
error = copyout(&r.fpxreg, (void *)uap->data,
sizeof(r.fpxreg));
} else {
/* clear dangerous bits exactly as Linux does*/
r.fpxreg.mxcsr &= 0xffbf;
_PHOLD(p); /* may block */
td2 = FIRST_THREAD_IN_PROC(p);
error = linux_proc_write_fpxregs(td2, &r.fpxreg);
_PRELE(p);
PROC_UNLOCK(p);
}
break;
fail:
PROC_UNLOCK(p);
#else
error = EIO;
#endif
break;
}
case PTRACE_PEEKUSR:
case PTRACE_POKEUSR: {
error = EIO;
/* check addr for alignment */
if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1))
break;
/*
* Allow linux programs to access register values in
* user struct. We simulate this through PT_GET/SETREGS
* as necessary.
*/
if (uap->addr < sizeof(struct linux_pt_reg)) {
error = kern_ptrace(td, PT_GETREGS, pid, &u.bsd_reg, 0);
if (error != 0)
break;
map_regs_to_linux(&u.bsd_reg, &r.reg);
if (req == PTRACE_PEEKUSR) {
error = copyout((char *)&r.reg + uap->addr,
(void *)uap->data, sizeof(l_int));
break;
}
*(l_int *)((char *)&r.reg + uap->addr) =
(l_int)uap->data;
map_regs_from_linux(&u.bsd_reg, &r.reg);
error = kern_ptrace(td, PT_SETREGS, pid, &u.bsd_reg, 0);
}
/*
* Simulate debug registers access
*/
if (uap->addr >= LINUX_DBREG_OFFSET &&
uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) {
error = kern_ptrace(td, PT_GETDBREGS, pid, &u.bsd_dbreg,
0);
if (error != 0)
break;
uap->addr -= LINUX_DBREG_OFFSET;
if (req == PTRACE_PEEKUSR) {
error = copyout((char *)&u.bsd_dbreg +
uap->addr, (void *)uap->data,
sizeof(l_int));
break;
}
*(l_int *)((char *)&u.bsd_dbreg + uap->addr) =
uap->data;
error = kern_ptrace(td, PT_SETDBREGS, pid,
&u.bsd_dbreg, 0);
}
break;
}
case PTRACE_SYSCALL:
/* fall through */
default:
printf("linux: ptrace(%u, ...) not implemented\n",
(unsigned int)uap->req);
error = EINVAL;
break;
}
return (error);
}
/*
* MPALMOSTSAFE
*/
int
sys_linux_ptrace(struct linux_ptrace_args *uap)
{
struct thread *td = curthread;
struct proc *curp = td->td_proc;
union {
struct linux_pt_reg reg;
struct linux_pt_fpreg fpreg;
struct linux_pt_fpxreg fpxreg;
} r;
union {
struct reg bsd_reg;
struct fpreg bsd_fpreg;
struct dbreg bsd_dbreg;
} u;
void *addr;
pid_t pid;
int error, req;
struct proc *p = NULL; /* held process */
error = 0;
/* by default, just copy data intact */
req = uap->req;
pid = (pid_t)uap->pid;
addr = (void *)uap->addr;
switch (req) {
case PTRACE_TRACEME:
case PTRACE_POKETEXT:
case PTRACE_POKEDATA:
case PTRACE_KILL:
error = kern_ptrace(curp, req, pid, addr, uap->data,
&uap->sysmsg_iresult);
break;
case PTRACE_PEEKTEXT:
case PTRACE_PEEKDATA: {
/* need to preserve return value, use dummy */
l_int rval = 0;
error = kern_ptrace(curp, req, pid, addr, 0, &rval);
if (error == 0) {
error = copyout(&rval, (caddr_t)uap->data, sizeof(l_int));
}
break;
}
case PTRACE_DETACH:
error = kern_ptrace(curp, PT_DETACH, pid, (void *)1,
map_signum(uap->data),
&uap->sysmsg_iresult);
break;
case PTRACE_SINGLESTEP:
case PTRACE_CONT:
error = kern_ptrace(curp, req, pid, (void *)1,
map_signum(uap->data),
&uap->sysmsg_iresult);
break;
case PTRACE_ATTACH:
error = kern_ptrace(curp, PT_ATTACH, pid, addr, uap->data,
&uap->sysmsg_iresult);
break;
case PTRACE_GETREGS:
/* Linux is using data where FreeBSD is using addr */
error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg, 0,
&uap->sysmsg_iresult);
if (error == 0) {
map_regs_to_linux(&u.bsd_reg, &r.reg);
error = copyout(&r.reg, (void *)uap->data,
sizeof(r.reg));
}
break;
case PTRACE_SETREGS:
/* Linux is using data where FreeBSD is using addr */
error = copyin((caddr_t)uap->data, &r.reg, sizeof(r.reg));
if (error == 0) {
map_regs_from_linux(&u.bsd_reg, &r.reg);
error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg,
0, &uap->sysmsg_iresult);
}
break;
case PTRACE_GETFPREGS:
/* Linux is using data where FreeBSD is using addr */
error = kern_ptrace(curp, PT_GETFPREGS, pid, &u.bsd_fpreg,
0, &uap->sysmsg_iresult);
if (error == 0) {
map_fpregs_to_linux(&u.bsd_fpreg, &r.fpreg);
error = copyout(&r.fpreg, (caddr_t)uap->data,
sizeof(r.fpreg));
}
break;
case PTRACE_SETFPREGS:
/* Linux is using data where FreeBSD is using addr */
error = copyin((caddr_t)uap->data, &r.fpreg, sizeof(r.fpreg));
if (error == 0) {
map_fpregs_from_linux(&u.bsd_fpreg, &r.fpreg);
error = kern_ptrace(curp, PT_SETFPREGS, pid,
&u.bsd_fpreg,
0, &uap->sysmsg_iresult);
}
break;
case PTRACE_SETFPXREGS:
#ifndef CPU_DISABLE_SSE
error = copyin((caddr_t)uap->data, &r.fpxreg,
sizeof(r.fpxreg));
if (error)
break;
#endif
/* FALL THROUGH */
case PTRACE_GETFPXREGS: {
#ifndef CPU_DISABLE_SSE
struct proc *p;
struct lwp *lp;
if (sizeof(struct linux_pt_fpxreg) != sizeof(struct savexmm)) {
static int once = 0;
if (!once) {
kprintf("linux: savexmm != linux_pt_fpxreg\n");
once = 1;
}
error = EIO;
break;
}
if ((p = pfind(uap->pid)) == NULL) {
error = ESRCH;
break;
}
if (!PRISON_CHECK(curp->p_ucred, p->p_ucred)) {
error = ESRCH;
goto fail;
}
/* System processes can't be debugged. */
if ((p->p_flag & P_SYSTEM) != 0) {
error = EINVAL;
goto fail;
}
/* not being traced... */
if ((p->p_flag & P_TRACED) == 0) {
error = EPERM;
goto fail;
}
/* not being traced by YOU */
if (p->p_pptr != curp) {
error = EBUSY;
goto fail;
}
/* not currently stopped */
if ((p->p_flag & (P_TRACED|P_WAITED)) == 0) {
error = EBUSY;
goto fail;
}
/* XXX lwp */
lp = FIRST_LWP_IN_PROC(p);
if (req == PTRACE_GETFPXREGS) {
LWPHOLD(lp);
error = linux_proc_read_fpxregs(lp, &r.fpxreg);
LWPRELE(lp);
if (error == 0)
error = copyout(&r.fpxreg, (caddr_t)uap->data,
sizeof(r.fpxreg));
} else {
/* clear dangerous bits exactly as Linux does*/
r.fpxreg.mxcsr &= 0xffbf;
LWPHOLD(lp);
error = linux_proc_write_fpxregs(lp, &r.fpxreg);
LWPRELE(lp);
}
break;
fail:
#else
error = EIO;
#endif
break;
}
case PTRACE_PEEKUSR:
case PTRACE_POKEUSR: {
error = EIO;
/* check addr for alignment */
if (uap->addr < 0 || uap->addr & (sizeof(l_int) - 1))
break;
/*
* Allow linux programs to access register values in
* user struct. We simulate this through PT_GET/SETREGS
* as necessary.
*/
if (uap->addr < sizeof(struct linux_pt_reg)) {
error = kern_ptrace(curp, PT_GETREGS, pid, &u.bsd_reg,
0, &uap->sysmsg_iresult);
if (error != 0)
break;
map_regs_to_linux(&u.bsd_reg, &r.reg);
if (req == PTRACE_PEEKUSR) {
error = copyout((char *)&r.reg + uap->addr,
(caddr_t)uap->data, sizeof(l_int));
break;
}
*(l_int *)((char *)&r.reg + uap->addr) =
(l_int)uap->data;
map_regs_from_linux(&u.bsd_reg, &r.reg);
error = kern_ptrace(curp, PT_SETREGS, pid, &u.bsd_reg,
0, &uap->sysmsg_iresult);
}
/*
* Simulate debug registers access
*/
if (uap->addr >= LINUX_DBREG_OFFSET &&
uap->addr <= LINUX_DBREG_OFFSET + LINUX_DBREG_SIZE) {
error = kern_ptrace(curp, PT_GETDBREGS, pid,
&u.bsd_dbreg,
0, &uap->sysmsg_iresult);
if (error != 0)
break;
uap->addr -= LINUX_DBREG_OFFSET;
if (req == PTRACE_PEEKUSR) {
error = copyout((char *)&u.bsd_dbreg +
uap->addr, (caddr_t)uap->data,
sizeof(l_int));
break;
}
*(l_int *)((char *)&u.bsd_dbreg + uap->addr) =
uap->data;
error = kern_ptrace(curp, PT_SETDBREGS, pid,
&u.bsd_dbreg,
0, &uap->sysmsg_iresult);
}
break;
}
case PTRACE_SYSCALL:
/* fall through */
default:
kprintf("linux: ptrace(%u, ...) not implemented\n",
(unsigned int)uap->req);
error = EINVAL;
break;
}
/*
* Release held proces (if any) before returning.
*/
if (p)
PRELE(p);
return (error);
}
int
ptrace(struct thread *td, struct ptrace_args *uap)
{
/*
* XXX this obfuscation is to reduce stack usage, but the register
* structs may be too large to put on the stack anyway.
*/
union {
struct ptrace_io_desc piod;
struct dbreg dbreg;
struct fpreg fpreg;
struct reg reg;
} r;
void *addr;
int error = 0;
addr = &r;
switch (uap->req) {
case PT_GETREGS:
case PT_GETFPREGS:
case PT_GETDBREGS:
break;
case PT_SETREGS:
error = copyin(uap->addr, &r.reg, sizeof r.reg);
break;
case PT_SETFPREGS:
error = copyin(uap->addr, &r.fpreg, sizeof r.fpreg);
break;
case PT_SETDBREGS:
error = copyin(uap->addr, &r.dbreg, sizeof r.dbreg);
break;
case PT_IO:
error = copyin(uap->addr, &r.piod, sizeof r.piod);
break;
default:
addr = uap->addr;
}
if (error)
return (error);
error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
if (error)
return (error);
switch (uap->req) {
case PT_IO:
(void)copyout(&r.piod, uap->addr, sizeof r.piod);
break;
case PT_GETREGS:
error = copyout(&r.reg, uap->addr, sizeof r.reg);
break;
case PT_GETFPREGS:
error = copyout(&r.fpreg, uap->addr, sizeof r.fpreg);
break;
case PT_GETDBREGS:
error = copyout(&r.dbreg, uap->addr, sizeof r.dbreg);
break;
}
return (error);
}