/* $NetBSD: linux_machdep.c,v 1.44 2022/08/07 20:14:01 tsutsui Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by ITOH Yasufumi.
*
* 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: linux_machdep.c,v 1.44 2022/08/07 20:14:01 tsutsui Exp $");
#define COMPAT_LINUX 1
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/syscallargs.h>
#include <sys/kauth.h>
#include <sys/cpu.h>
#include <machine/reg.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_signal.h>
#include <compat/linux/common/linux_ioctl.h>
#include <compat/linux/common/linux_exec.h>
#include <compat/linux/common/linux_machdep.h>
#include <compat/linux/linux_syscall.h>
#include <compat/linux/linux_syscallargs.h>
/* XXX should be in an include file somewhere */
#define CC_PURGE 1
#define CC_FLUSH 2
#define CC_IPURGE 4
#define CC_EXTPURGE 0x80000000
/* XXX end should be */
extern short exframesize[];
#ifdef DEBUG
extern int sigdebug;
extern int sigpid;
#define SDB_FOLLOW 0x01
#define SDB_KSTACK 0x02
#define SDB_FPSTATE 0x04
#endif
void setup_linux_sigframe(struct frame *frame, int sig,
const sigset_t *mask, void *usp);
void setup_linux_rt_sigframe(struct frame *frame, int sig,
const sigset_t *mask, void *usp, struct lwp *l);
/*
* Deal with some m68k-specific things in the Linux emulation code.
*/
/*
* Setup registers on program execution.
*/
void
linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
{
setregs(l, epp, stack);
}
/*
* Setup signal frame for old signal interface.
*/
void
setup_linux_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct linux_sigframe *fp, kf;
short ft;
int error;
ft = frame->f_format;
/* Allocate space for the signal handler context on the user stack. */
fp = (struct linux_sigframe *) usp;
fp--;
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("setup_linux_sigframe(%d): sig %d ssp %p usp %p scp %p ft %d\n",
p->p_pid, sig, &ft, fp, &fp->sf_c.c_sc, ft);
#endif
memset(&kf, 0, sizeof(kf));
/* Build stack frame. */
kf.sf_psigtramp = fp->sf_sigtramp; /* return addr for handler */
kf.sf_signum = native_to_linux_signo[sig];
kf.sf_code = frame->f_vector; /* Does anyone use it? */
kf.sf_scp = &fp->sf_c.c_sc;
/* The sigtramp code is on the stack frame on Linux/m68k. */
kf.sf_sigtramp[0] = LINUX_SF_SIGTRAMP0;
kf.sf_sigtramp[1] = LINUX_SF_SIGTRAMP1;
/*
* Save necessary hardware state. Currently this includes:
* - scratch registers
* - original exception frame (if not a "normal" frame)
* - FP coprocessor state
*/
kf.sf_c.c_sc.sc_d0 = frame->f_regs[D0];
kf.sf_c.c_sc.sc_d1 = frame->f_regs[D1];
kf.sf_c.c_sc.sc_a0 = frame->f_regs[A0];
kf.sf_c.c_sc.sc_a1 = frame->f_regs[A1];
/* Clear for security (and initialize ss_format). */
memset(&kf.sf_c.c_sc.sc_ss, 0, sizeof kf.sf_c.c_sc.sc_ss);
if (ft >= FMT4) {
#ifdef DEBUG
if (ft > 15 || exframesize[ft] < 0)
panic("setup_linux_sigframe: bogus frame type");
#endif
kf.sf_c.c_sc.sc_ss.ss_format = ft;
kf.sf_c.c_sc.sc_ss.ss_vector = frame->f_vector;
memcpy(&kf.sf_c.c_sc.sc_ss.ss_frame, &frame->F_u,
(size_t) exframesize[ft]);
/*
* Leave an indicator that we need to clean up the kernel
* stack. We do this by setting the "pad word" above the
* hardware stack frame to the amount the stack must be
* adjusted by.
*
* N.B. we increment rather than just set f_stackadj in
* case we are called from syscall when processing a
* sigreturn. In that case, f_stackadj may be non-zero.
*/
frame->f_stackadj += exframesize[ft];
frame->f_format = frame->f_vector = 0;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("setup_linux_sigframe(%d): copy out %d of frame %d\n",
p->p_pid, exframesize[ft], ft);
#endif
}
switch (fputype) {
case FPU_NONE:
break;
#ifdef M68060
case FPU_68060:
__asm("fsave %0" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1)
: : "memory");
if (((struct fpframe060 *)&kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1)
->fpf6_frmfmt != FPF6_FMT_NULL) {
__asm("fmovem %%fp0-%%fp1,%0" :
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_regs[0][0]));
/*
* On 060, "fmovem fpcr/fpsr/fpi,<ea>" is
* emulated by software and slow.
*/
__asm("fmovem %%fpcr,%0; fmovem %%fpsr,%1; fmovem %%fpi,%2" :
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpcr),
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpsr),
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpiar));
}
break;
#endif
default:
__asm("fsave %0" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1)
: : "memory");
if (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_version) {
__asm("fmovem %%fp0-%%fp1,%0; fmovem %%fpcr/%%fpsr/%%fpi,%1" :
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_regs[0][0]),
"=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpcr)
: : "memory");
}
break;
}
#ifdef DEBUG
if ((sigdebug & SDB_FPSTATE) && *(char *)&kf.sf_c.c_sc.sc_ss.ss_fpstate)
printf("setup_linux_sigframe(%d): copy out FP state (%x) to %p\n",
p->p_pid, *(u_int *)&kf.sf_c.c_sc.sc_ss.ss_fpstate,
&kf.sf_c.c_sc.sc_ss.ss_fpstate);
#endif
/* Build the signal context to be used by sigreturn. */
#if LINUX__NSIG_WORDS > 1
native_to_linux_old_extra_sigset(&kf.sf_c.c_sc.sc_mask,
kf.sf_c.c_extrasigmask, mask);
#else
native_to_linux_old_sigset(&kf.sf_c.c_sc.sc_mask, mask);
#endif
kf.sf_c.c_sc.sc_sp = frame->f_regs[SP];
kf.sf_c.c_sc.sc_pc = frame->f_pc;
kf.sf_c.c_sc.sc_ps = frame->f_sr;
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&kf, fp, sizeof(struct linux_sigframe));
mutex_enter(p->p_lock);
if (error) {
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("setup_linux_sigframe(%d): copyout failed on sig %d\n",
p->p_pid, sig);
#endif
/*
* Process has trashed its stack; give it a segmentation
* violation to halt it in its tracks.
*/
sigexit(l, SIGSEGV);
/* NOTREACHED */
}
/*
* The signal trampoline is on the signal frame.
* Clear the instruction cache in case of cached.
*/
cachectl1(CC_EXTPURGE | CC_IPURGE,
(vaddr_t) fp->sf_sigtramp, sizeof fp->sf_sigtramp, p);
/* Set up the user stack pointer. */
frame->f_regs[SP] = (int)fp;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("setup_linux_sigframe(%d): sig %d scp %p fp %p sc_sp %x\n",
p->p_pid, sig, kf.sf_scp, fp, kf.sf_c.c_sc.sc_sp);
#endif
}
/*
* Setup signal frame for new RT signal interface.
*/
void
setup_linux_rt_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp, struct lwp *l)
{
struct proc *p = l->l_proc;
struct linux_rt_sigframe *fp, kf;
int error;
short ft;
ft = frame->f_format;
/* Allocate space for the signal handler context on the user stack. */
fp = (struct linux_rt_sigframe *) usp;
fp--;
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("setup_linux_rt_sigframe(%d): sig %d ssp %p usp %p ucp %p ft %d\n",
p->p_pid, sig, &ft, fp, &fp->sf_uc, ft);
#endif
memset(&kf, 0, sizeof(kf));
/* Build stack frame. */
kf.sf_psigtramp = fp->sf_sigtramp; /* return addr for handler */
kf.sf_signum = native_to_linux_signo[sig];
kf.sf_pinfo = &fp->sf_info;
kf.sf_puc = &fp->sf_uc;
/* The sigtramp code is on the stack frame on Linux/m68k. */
kf.sf_sigtramp[0] = LINUX_RT_SF_SIGTRAMP0;
kf.sf_sigtramp[1] = LINUX_RT_SF_SIGTRAMP1;
/* clear for security (and initialize uc_flags, ss_format, etc.). */
memset(&kf.sf_uc, 0, sizeof(struct linux_ucontext));
/*
* Save necessary hardware state. Currently this includes:
* - general registers
* - original exception frame (if not a "normal" frame)
* - FP coprocessor state
*/
/* version of mcontext */
kf.sf_uc.uc_mc.mc_version = LINUX_MCONTEXT_VERSION;
/* general registers and pc/sr */
memcpy(kf.sf_uc.uc_mc.mc_gregs.gr_regs, frame->f_regs, sizeof(u_int)*16);
kf.sf_uc.uc_mc.mc_gregs.gr_pc = frame->f_pc;
kf.sf_uc.uc_mc.mc_gregs.gr_sr = frame->f_sr;
if (ft >= FMT4) {
#ifdef DEBUG
if (ft > 15 || exframesize[ft] < 0)
panic("setup_linux_rt_sigframe: bogus frame type");
#endif
kf.sf_uc.uc_ss.ss_format = ft;
kf.sf_uc.uc_ss.ss_vector = frame->f_vector;
memcpy(&kf.sf_uc.uc_ss.ss_frame, &frame->F_u,
(size_t) exframesize[ft]);
/*
* Leave an indicator that we need to clean up the kernel
* stack. We do this by setting the "pad word" above the
* hardware stack frame to the amount the stack must be
* adjusted by.
*
* N.B. we increment rather than just set f_stackadj in
* case we are called from syscall when processing a
* sigreturn. In that case, f_stackadj may be non-zero.
*/
frame->f_stackadj += exframesize[ft];
frame->f_format = frame->f_vector = 0;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("setup_linux_rt_sigframe(%d): copy out %d of frame %d\n",
p->p_pid, exframesize[ft], ft);
#endif
}
switch (fputype) {
case FPU_NONE:
break;
#ifdef M68060
case FPU_68060:
__asm("fsave %0" : "=m" (kf.sf_uc.uc_ss.ss_fpstate));
/* See note below. */
if (((struct fpframe060 *) &kf.sf_uc.uc_ss.ss_fpstate.FPF_u1)
->fpf6_frmfmt != FPF6_FMT_NULL) {
__asm("fmovem %%fp0-%%fp7,%0" :
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_regs[0][0]));
/*
* On 060, "fmovem fpcr/fpsr/fpi,<ea>" is
* emulated by software and slow.
*/
__asm("fmovem %%fpcr,%0; fmovem %%fpsr,%1; fmovem %%fpi,%2" :
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpcr),
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpsr),
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpiar));
}
break;
#endif
default:
/*
* NOTE: We give whole of the "struct linux_rt_fpframe"
* to the __asm("fsave") argument; not the FPF_u1 element only.
* Unlike the non-RT version of this structure,
* this contains only the FPU state used by "fsave"
* (and whole of the information is in the structure).
* This gives the correct dependency information to the __asm(),
* and no "memory" is required to the ``clobberd'' list.
*/
__asm("fsave %0" : "=m" (kf.sf_uc.uc_ss.ss_fpstate));
if (kf.sf_uc.uc_ss.ss_fpstate.fpf_version) {
__asm("fmovem %%fp0-%%fp7,%0; fmovem %%fpcr/%%fpsr/%%fpi,%1" :
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_regs[0][0]),
"=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpcr)
: : "memory");
}
break;
}
#ifdef DEBUG
if ((sigdebug & SDB_FPSTATE) && *(char *)&kf.sf_uc.uc_ss.ss_fpstate)
printf("setup_linux_rt_sigframe(%d): copy out FP state (%x) to %p\n",
p->p_pid, *(u_int *)&kf.sf_uc.uc_ss.ss_fpstate,
&kf.sf_uc.uc_ss.ss_fpstate);
#endif
/*
* XXX XAX Create bogus siginfo data. This can't really
* XXX be fixed until NetBSD has realtime signals.
* XXX Or we do the emuldata thing.
* XXX -erh
*/
memset(&kf.sf_info, 0, sizeof(struct linux_siginfo));
kf.sf_info.lsi_signo = sig;
kf.sf_info.lsi_code = LINUX_SI_USER;
kf.sf_info.lsi_pid = p->p_pid;
kf.sf_info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */
/* Build the signal context to be used by sigreturn. */
native_to_linux_sigset(&kf.sf_uc.uc_sigmask, mask);
kf.sf_uc.uc_stack.ss_sp = l->l_sigstk.ss_sp;
kf.sf_uc.uc_stack.ss_flags =
(l->l_sigstk.ss_flags & SS_ONSTACK ? LINUX_SS_ONSTACK : 0) |
(l->l_sigstk.ss_flags & SS_DISABLE ? LINUX_SS_DISABLE : 0);
kf.sf_uc.uc_stack.ss_size = l->l_sigstk.ss_size;
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&kf, fp, sizeof(struct linux_rt_sigframe));
mutex_enter(p->p_lock);
if (error) {
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("setup_linux_rt_sigframe(%d): copyout failed on sig %d\n",
p->p_pid, sig);
#endif
/*
* Process has trashed its stack; give it a segmentation
* violation to halt it in its tracks.
*/
sigexit(l, SIGSEGV);
/* NOTREACHED */
}
/*
* The signal trampoline is on the signal frame.
* Clear the instruction cache in case of cached.
*/
cachectl1(CC_EXTPURGE | CC_IPURGE,
(vaddr_t) fp->sf_sigtramp, sizeof fp->sf_sigtramp, p);
/* Set up the user stack pointer. */
frame->f_regs[SP] = (int)fp;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("setup_linux_rt_sigframe(%d): sig %d puc %p fp %p sc_sp %x\n",
p->p_pid, sig, kf.sf_puc, fp,
kf.sf_uc.uc_mc.mc_gregs.gr_regs[SP]);
#endif
}
/*
* Send an interrupt to Linux process.
*/
void
linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
/* u_long code = ksi->ksi_trap; */
int sig = ksi->ksi_signo;
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct frame *frame = (struct frame *)l->l_md.md_regs;
int onstack;
/* user stack for signal context */
void *usp = getframe(l, sig, &onstack);
sig_t catcher = SIGACTION(p, sig).sa_handler;
/* Setup the signal frame (and part of the trapframe). */
if (SIGACTION(p, sig).sa_flags & SA_SIGINFO)
setup_linux_rt_sigframe(frame, sig, mask, usp, l);
else
setup_linux_sigframe(frame, sig, mask, usp);
/* Call the signal handler. */
frame->f_pc = (u_int) catcher;
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
#ifdef DEBUG
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
printf("linux_sendsig(%d): sig %d returns\n",
p->p_pid, sig);
#endif
}
/*
* The linux_sys_sigreturn and linux_sys_rt_sigreturn
* system calls cleanup state after a signal
* has been taken. Reset signal mask and stack
* state from context left by linux_sendsig (above).
* Return to previous pc and psl as specified by
* context left by linux_sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*
* Note that the sigreturn system calls of Linux/m68k
* do not return on errors, but issue segmentation
* violation and terminate the process.
*/
/* ARGSUSED */
int
linux_sys_sigreturn(struct lwp *l, const void *v, register_t *retval)
{
struct proc *p = l->l_proc;
struct frame *frame;
struct linux_sigc2 tsigc2; /* extra mask and sigcontext */
struct linux_sigcontext *scp; /* pointer to sigcontext */
sigset_t mask;
int sz = 0; /* extra frame size */
int usp;
/*
* sigreturn of Linux/m68k takes no arguments.
* The user stack points at struct linux_sigc2.
*/
frame = (struct frame *) l->l_md.md_regs;
usp = frame->f_regs[SP];
if (usp & 1)
goto bad;
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("linux_sys_sigreturn: pid %d, usp %p\n",
p->p_pid, (void *) usp);
#endif
/* Grab whole of the sigcontext. */
if (copyin((void *) usp, &tsigc2, sizeof tsigc2)) {
bad:
mutex_enter(p->p_lock);
sigexit(l, SIGSEGV);
}
scp = &tsigc2.c_sc;
/*
* Check kernel stack and re-enter to syscall() if needed.
*/
if ((sz = scp->sc_ss.ss_format) != 0) {
if ((sz = exframesize[sz]) < 0)
goto bad;
if (sz && frame->f_stackadj == 0) {
/*
* Extra stack space is required but not allocated.
* Allocate and re-enter syscall().
*/
reenter_syscall(frame, sz);
/* NOTREACHED */
}
}
#ifdef DEBUG
/* reenter_syscall() doesn't adjust stack. */
if (sz != frame->f_stackadj)
panic("linux_sys_sigreturn: adj: %d != %d",
sz, frame->f_stackadj);
#endif
mutex_enter(p->p_lock);
/* Restore signal stack. */
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
#if LINUX__NSIG_WORDS > 1
linux_old_extra_to_native_sigset(&mask, &scp->sc_mask,
tsigc2.c_extrasigmask);
#else
linux_old_to_native_sigset(&scp->sc_mask, &mask);
#endif
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
/*
* Restore the user supplied information.
*/
frame->f_regs[SP] = scp->sc_sp;
frame->f_regs[D0] = scp->sc_d0;
frame->f_regs[D1] = scp->sc_d1;
frame->f_regs[A0] = scp->sc_a0;
frame->f_regs[A1] = scp->sc_a1;
frame->f_pc = scp->sc_pc;
/* Privileged bits of sr are silently ignored on Linux/m68k. */
frame->f_sr = scp->sc_ps & ~(PSL_MBZ|PSL_IPL|PSL_S);
/*
* Other registers are assumed to be unchanged,
* and not restored.
*/
/*
* Restore long stack frames. Note that we do not copy
* back the saved SR or PC, they were picked up above from
* the sigcontext structure.
*/
if (scp->sc_ss.ss_format) {
frame->f_format = scp->sc_ss.ss_format;
frame->f_vector = scp->sc_ss.ss_vector;
if (frame->f_stackadj < sz) /* just in case... */
goto bad;
frame->f_stackadj -= sz;
memcpy(&frame->F_u, &scp->sc_ss.ss_frame, sz);
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("linux_sys_sigreturn(%d): copy in %d of frame type %d\n",
p->p_pid, sz, scp->sc_ss.ss_format);
#endif
}
/*
* Finally we restore the original FP context.
*/
switch (fputype) {
case FPU_NONE:
break;
#ifdef M68060
case FPU_68060:
if (((struct fpframe060*)&scp->sc_ss.ss_fpstate.FPF_u1)
->fpf6_frmfmt != FPF6_FMT_NULL) {
/*
* On 060, "fmovem <ea>,fpcr/fpsr/fpi" is
* emulated by software and slow.
*/
__asm("fmovem %0,%%fpcr; fmovem %1,%%fpsr; fmovem %2,%%fpi"::
"m" (scp->sc_ss.ss_fpstate.fpf_fpcr),
"m" (scp->sc_ss.ss_fpstate.fpf_fpsr),
"m" (scp->sc_ss.ss_fpstate.fpf_fpiar));
__asm("fmovem %0,%%fp0-%%fp1" : :
"m" (scp->sc_ss.ss_fpstate.fpf_regs[0][0]));
}
__asm("frestore %0" : : "m" (scp->sc_ss.ss_fpstate.FPF_u1));
break;
#endif
default:
if (scp->sc_ss.ss_fpstate.fpf_version) {
__asm("fmovem %0,%%fpcr/%%fpsr/%%fpi; fmovem %1,%%fp0-%%fp1"::
"m" (scp->sc_ss.ss_fpstate.fpf_fpcr),
"m" (scp->sc_ss.ss_fpstate.fpf_regs[0][0]));
}
__asm("frestore %0" : : "m" (scp->sc_ss.ss_fpstate.FPF_u1));
break;
}
#ifdef DEBUG
if ((sigdebug & SDB_FPSTATE) && *(char *)&scp->sc_ss.ss_fpstate)
printf("linux_sys_sigreturn(%d): copied in FP state (%x) at %p\n",
p->p_pid, *(u_int *)&scp->sc_ss.ss_fpstate,
&scp->sc_ss.ss_fpstate);
if ((sigdebug & SDB_FOLLOW) ||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
printf("linux_sys_sigreturn(%d): returns\n", p->p_pid);
#endif
return EJUSTRETURN;
}
/* ARGSUSED */
int
linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval)
{
struct proc *p = l->l_proc;
struct frame *frame;
struct linux_ucontext *ucp; /* ucontext in user space */
struct linux_ucontext tuc; /* copy of *ucp */
sigset_t mask;
int sz = 0, error; /* extra frame size */
/*
* rt_sigreturn of Linux/m68k takes no arguments.
* usp + 4 is a pointer to siginfo structure,
* usp + 8 is a pointer to ucontext structure.
*/
frame = (struct frame *) l->l_md.md_regs;
error = copyin((char *)frame->f_regs[SP] + 8, (void *)&ucp,
sizeof(void *));
if (error || (int) ucp & 1)
goto bad; /* error or odd address */
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("linux_rt_sigreturn: pid %d, ucp %p\n", p->p_pid, ucp);
#endif
/* Grab whole of the ucontext. */
if (copyin(ucp, &tuc, sizeof tuc)) {
bad:
mutex_enter(p->p_lock);
sigexit(l, SIGSEGV);
}
/*
* Check kernel stack and re-enter to syscall() if needed.
*/
if ((sz = tuc.uc_ss.ss_format) != 0) {
if ((sz = exframesize[sz]) < 0)
goto bad;
if (sz && frame->f_stackadj == 0) {
/*
* Extra stack space is required but not allocated.
* Allocate and re-enter syscall().
*/
reenter_syscall(frame, sz);
/* NOTREACHED */
}
}
#ifdef DEBUG
/* reenter_syscall() doesn't adjust stack. */
if (sz != frame->f_stackadj)
panic("linux_sys_rt_sigreturn: adj: %d != %d",
sz, frame->f_stackadj);
#endif
if (tuc.uc_mc.mc_version != LINUX_MCONTEXT_VERSION)
goto bad;
mutex_enter(p->p_lock);
/* Restore signal stack. */
l->l_sigstk.ss_flags =
(l->l_sigstk.ss_flags & ~SS_ONSTACK) |
(tuc.uc_stack.ss_flags & LINUX_SS_ONSTACK ? SS_ONSTACK : 0);
/* Restore signal mask. */
linux_to_native_sigset(&mask, &tuc.uc_sigmask);
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
/*
* Restore the user supplied information.
*/
memcpy(frame->f_regs, tuc.uc_mc.mc_gregs.gr_regs, sizeof(u_int)*16);
frame->f_pc = tuc.uc_mc.mc_gregs.gr_pc;
/* Privileged bits of sr are silently ignored on Linux/m68k. */
frame->f_sr = tuc.uc_mc.mc_gregs.gr_sr & ~(PSL_MBZ|PSL_IPL|PSL_S);
/*
* Restore long stack frames. Note that we do not copy
* back the saved SR or PC, they were picked up above from
* the ucontext structure.
*/
if (tuc.uc_ss.ss_format) {
frame->f_format = tuc.uc_ss.ss_format;
frame->f_vector = tuc.uc_ss.ss_vector;
if (frame->f_stackadj < sz) /* just in case... */
goto bad;
frame->f_stackadj -= sz;
memcpy(&frame->F_u, &tuc.uc_ss.ss_frame, sz);
#ifdef DEBUG
if (sigdebug & SDB_FOLLOW)
printf("linux_sys_rt_sigreturn(%d): copy in %d of frame type %d\n",
p->p_pid, sz, tuc.uc_ss.ss_format);
#endif
}
/*
* Finally we restore the original FP context.
*/
switch (fputype) {
case FPU_NONE:
break;
#ifdef M68060
case FPU_68060:
if (((struct fpframe060*)&tuc.uc_ss.ss_fpstate.FPF_u1)
->fpf6_frmfmt != FPF6_FMT_NULL) {
/*
* On 060, "fmovem <ea>,fpcr/fpsr/fpi" is
* emulated by software and slow.
*/
__asm("fmovem %0,%%fpcr; fmovem %1,%%fpsr; fmovem %2,%%fpi"::
"m" (tuc.uc_mc.mc_fpregs.fpr_fpcr),
"m" (tuc.uc_mc.mc_fpregs.fpr_fpsr),
"m" (tuc.uc_mc.mc_fpregs.fpr_fpiar));
__asm("fmovem %0,%%fp0-%%fp1" : :
"m" (tuc.uc_mc.mc_fpregs.fpr_regs[0][0]));
}
__asm("frestore %0" : : "m" (tuc.uc_ss.ss_fpstate.FPF_u1));
break;
#endif
default:
if (tuc.uc_ss.ss_fpstate.fpf_version) {
__asm("fmovem %0,%%fpcr/%%fpsr/%%fpi; fmovem %1,%%fp0-%%fp1"::
"m" (tuc.uc_mc.mc_fpregs.fpr_fpcr),
"m" (tuc.uc_mc.mc_fpregs.fpr_regs[0][0]));
}
__asm("frestore %0" : : "m" (tuc.uc_ss.ss_fpstate.FPF_u1));
break;
}
#ifdef DEBUG
if ((sigdebug & SDB_FPSTATE) && *(char *)&tuc.uc_ss.ss_fpstate)
printf("linux_rt_sigreturn(%d): copied in FP state (%x) at %p\n",
p->p_pid, *(u_int *)&tuc.uc_ss.ss_fpstate,
&tuc.uc_ss.ss_fpstate);
if ((sigdebug & SDB_FOLLOW) ||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
printf("linux_rt_sigreturn(%d): returns\n", p->p_pid);
#endif
return EJUSTRETURN;
}
/*
* MPU cache operation of Linux/m68k,
* mainly used for dynamic linking.
*/
/* scope */
#define LINUX_FLUSH_SCOPE_LINE 1 /* a cache line */
#define LINUX_FLUSH_SCOPE_PAGE 2 /* a page */
#define LINUX_FLUSH_SCOPE_ALL 3 /* the whole cache */
/* cache */
#define LINUX_FLUSH_CACHE_DATA 1 /* flush and purge data cache */
#define LINUX_FLUSH_CACHE_INSN 2 /* purge instruction cache */
#define LINUX_FLUSH_CACHE_BOTH 3 /* both */
/* ARGSUSED */
int
linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval)
{
/* {
syscallarg(unsigned long) addr;
syscallarg(int) scope;
syscallarg(int) cache;
syscallarg(unsigned long) len;
} */
struct proc *p = l->l_proc;
int scope, cache;
vaddr_t addr;
int len;
int error;
scope = SCARG(uap, scope);
cache = SCARG(uap, cache);
if (scope < LINUX_FLUSH_SCOPE_LINE || scope > LINUX_FLUSH_SCOPE_ALL
|| cache & ~LINUX_FLUSH_CACHE_BOTH)
return EINVAL;
#if defined(M68040) || defined(M68060)
addr = (vaddr_t) SCARG(uap, addr);
len = (int) SCARG(uap, len);
#else
/*
* We always flush entire cache on 68020/030
* and these values are not used afterwards.
*/
addr = 0;
len = 0;
#endif
/*
* LINUX_FLUSH_SCOPE_ALL (flush whole cache) is limited to super users.
*/
if (scope == LINUX_FLUSH_SCOPE_ALL) {
if ((error = kauth_authorize_machdep(l->l_cred,
KAUTH_MACHDEP_CACHEFLUSH, NULL, NULL, NULL, NULL)) != 0)
return error;
#if defined(M68040) || defined(M68060)
/* entire cache */
len = INT_MAX;
#endif
}
error = 0;
if (cache & LINUX_FLUSH_CACHE_DATA)
if ((error = cachectl1(CC_EXTPURGE|CC_PURGE, addr, len, p)) !=0)
return error;
if (cache & LINUX_FLUSH_CACHE_INSN)
error = cachectl1(CC_EXTPURGE|CC_IPURGE, addr, len, p);
return error;
}
/*
* Convert NetBSD's devices to Linux's.
*/
dev_t
linux_fakedev(dev_t dev, int raw)
{
/* do nothing for now */
return dev;
}
/*
* We come here in a last attempt to satisfy a Linux ioctl() call.
*/
int
linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(u_long) com;
syscallarg(void *) data;
} */
struct sys_ioctl_args bia;
u_long com;
SCARG(&bia, fd) = SCARG(uap, fd);
SCARG(&bia, data) = SCARG(uap, data);
com = SCARG(uap, com);
switch (com) {
/* do nothing for now */
default:
printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
return EINVAL;
}
SCARG(&bia, com) = com;
return sys_ioctl(l, &bia, retval);
}
int
linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
{
return 0;
}