/*      $NetBSD: sys_process_lwpstatus.c,v 1.5 2025/01/11 19:42:04 christos Exp $       */

/*-
* Copyright (c) 2019 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sys_process_lwpstatus.c,v 1.5 2025/01/11 19:42:04 christos Exp $");

#ifdef _KERNEL_OPT
#include "opt_ptrace.h"
#include "opt_ktrace.h"
#include "opt_pax.h"
#include "opt_compat_netbsd32.h"
#endif

#if defined(__HAVE_COMPAT_NETBSD32) && !defined(COMPAT_NETBSD32) \
   && !defined(_RUMPKERNEL)
#define COMPAT_NETBSD32
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/lwp.h>
#include <sys/proc.h>
#include <sys/ptrace.h>

#ifndef PTRACE_REGS_ALIGN
#define PTRACE_REGS_ALIGN /* nothing */
#endif

void
ptrace_read_lwpstatus(struct lwp *l, struct ptrace_lwpstatus *pls)
{

       pls->pl_lwpid = l->l_lid;
       memcpy(&pls->pl_sigmask, &l->l_sigmask, sizeof(pls->pl_sigmask));
       memcpy(&pls->pl_sigpend, &l->l_sigpend.sp_set, sizeof(pls->pl_sigpend));

       if (l->l_name == NULL)
               memset(&pls->pl_name, 0, PL_LNAMELEN);
       else {
               KASSERT(strlen(l->l_name) < PL_LNAMELEN);
               strncpy(pls->pl_name, l->l_name, PL_LNAMELEN);
       }

#ifdef PTRACE_LWP_GETPRIVATE
       pls->pl_private = (void *)(intptr_t)PTRACE_LWP_GETPRIVATE(l);
#else
       pls->pl_private = l->l_private;
#endif
}

void
process_read_lwpstatus(struct lwp *l, struct ptrace_lwpstatus *pls)
{

       ptrace_read_lwpstatus(l, pls);
}

int
ptrace_update_lwp(struct proc *t, struct lwp **lt, lwpid_t lid)
{
       if (lid == 0 || lid == (*lt)->l_lid || t->p_nlwps == 1)
               return 0;

       mutex_enter(t->p_lock);
       lwp_delref2(*lt);

       *lt = lwp_find(t, lid);
       if (*lt == NULL) {
               mutex_exit(t->p_lock);
               return ESRCH;
       }

       if ((*lt)->l_flag & LW_SYSTEM) {
               mutex_exit(t->p_lock);
               *lt = NULL;
               return EINVAL;
       }

       lwp_addref(*lt);
       mutex_exit(t->p_lock);

       return 0;
}

int
process_validfpregs(struct lwp *l)
{

#if defined(PT_FPREGS)
       return (l->l_flag & LW_SYSTEM) == 0;
#else
       return 0;
#endif
}

int
process_validregs(struct lwp *l)
{

#if defined(PT_REGS)
       return (l->l_flag & LW_SYSTEM) == 0;
#else
       return 0;
#endif
}

int
process_validdbregs(struct lwp *l)
{

#if defined(PT_DBREGS)
       return (l->l_flag & LW_SYSTEM) == 0;
#else
       return 0;
#endif
}

#ifdef PT_REGISTERS
static int
proc_regio(struct lwp *l, struct uio *uio, size_t ks, ptrace_regrfunc_t r,
   ptrace_regwfunc_t w)
{
       char buf[1024] PTRACE_REGS_ALIGN;
       int error;
       char *kv;
       size_t kl;

       if (ks > sizeof(buf))
               return E2BIG;

       if (uio->uio_offset < 0 || uio->uio_offset > (off_t)ks)
               return EINVAL;

       kv = buf + uio->uio_offset;
       kl = ks - uio->uio_offset;

       if (kl > uio->uio_resid)
               kl = uio->uio_resid;

       error = (*r)(l, buf, &ks);
       if (error == 0)
               error = uiomove(kv, kl, uio);
       if (error == 0 && uio->uio_rw == UIO_WRITE) {
               if (l->l_stat != LSSTOP)
                       error = EBUSY;
               else
                       error = (*w)(l, buf, ks);
       }

       uio->uio_offset = 0;
       return error;
}
#endif

int
process_doregs(struct lwp *curl /*tracer*/,
   struct lwp *l /*traced*/,
   struct uio *uio)
{
#if defined(PT_REGS)
       size_t s;
       ptrace_regrfunc_t r;
       ptrace_regwfunc_t w;

#ifdef COMPAT_NETBSD32
       const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0;

       if (__predict_false(pk32)) {
               if ((l->l_proc->p_flag & PK_32) == 0) {
                       // 32 bit tracer can't trace 64 bit process
                       return EINVAL;
               }
               s = sizeof(process_reg32);
               r = __FPTRCAST(ptrace_regrfunc_t, process_read_regs32);
               w = __FPTRCAST(ptrace_regwfunc_t, process_write_regs32);
       } else
#endif
       {
               s = sizeof(struct reg);
               r = __FPTRCAST(ptrace_regrfunc_t, process_read_regs);
               w = __FPTRCAST(ptrace_regwfunc_t, process_write_regs);
       }
       return proc_regio(l, uio, s, r, w);
#else
       return EINVAL;
#endif
}

int
process_dofpregs(struct lwp *curl /*tracer*/,
   struct lwp *l /*traced*/,
   struct uio *uio)
{
#if defined(PT_FPREGS)
       size_t s;
       ptrace_regrfunc_t r;
       ptrace_regwfunc_t w;

#ifdef COMPAT_NETBSD32
       const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0;

       if (__predict_false(pk32)) {
               if ((l->l_proc->p_flag & PK_32) == 0) {
                       // 32 bit tracer can't trace 64 bit process
                       return EINVAL;
               }
               s = sizeof(process_fpreg32);
               r = (ptrace_regrfunc_t)process_read_fpregs32;
               w = (ptrace_regwfunc_t)process_write_fpregs32;
       } else
#endif
       {
               s = sizeof(struct fpreg);
               r = (ptrace_regrfunc_t)process_read_fpregs;
               w = (ptrace_regwfunc_t)process_write_fpregs;
       }
       return proc_regio(l, uio, s, r, w);
#else
       return EINVAL;
#endif
}


int
process_dodbregs(struct lwp *curl /*tracer*/,
   struct lwp *l /*traced*/,
   struct uio *uio)
{
#if defined(PT_DBREGS)
       size_t s;
       ptrace_regrfunc_t r;
       ptrace_regwfunc_t w;

#ifdef COMPAT_NETBSD32
       const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0;

       if (__predict_false(pk32)) {
               if ((l->l_proc->p_flag & PK_32) == 0) {
                       // 32 bit tracer can't trace 64 bit process
                       return EINVAL;
               }
               s = sizeof(process_dbreg32);
               r = (ptrace_regrfunc_t)process_read_dbregs32;
               w = (ptrace_regwfunc_t)process_write_dbregs32;
       } else
#endif
       {
               s = sizeof(struct dbreg);
               r = (ptrace_regrfunc_t)process_read_dbregs;
               w = (ptrace_regwfunc_t)process_write_dbregs;
       }
       return proc_regio(l, uio, s, r, w);
#else
       return EINVAL;
#endif
}

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