/*-
* Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Frank van der Linden and Emmanuel Dreyfus.
*
* 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.
*/
/*
* Do we need to jump onto the signal stack?
*/
onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0
&& (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
/*
* Signal stack is broken (see at the end of linux_sigreturn), so we do
* not use it yet. XXX fix this.
*/
onstack = false;
/*
* Allocate space for the signal handler context.
*/
sf = (void *)(onstack
? (uintptr_t) l->l_sigstk.ss_sp + l->l_sigstk.ss_size
: (uintptr_t) tf->tf_regs[_R_SP]);
/*
* Build stack frame for signal trampoline.
*/
memset(&ksf, 0, sizeof ksf);
/*
* This is the signal trampoline used by Linux, we don't use it,
* but we set it up in case an application expects it to be there
*/
ksf.sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */
ksf.sf.lsf_code[1] = 0x0000000c; /* syscall */
/*
* Save signal stack. XXX broken
*/
/* kregs.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; */
/*
* Install the sigframe onto the stack
*/
sf -= sizeof(*sf);
mutex_exit(p->p_lock);
error = copyout(&ksf, sf, sizeof(ksf));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
#ifdef DEBUG_LINUX
printf("linux_sendsig: stack trashed\n");
#endif /* DEBUG_LINUX */
sigexit(l, SIGILL);
/* NOTREACHED */
}
/* Set up the registers to return to sigcode. */
tf->tf_regs[_R_A0] = native_to_linux_signo[sig];
tf->tf_regs[_R_A1] = 0;
tf->tf_regs[_R_A2] = (intptr_t)&sf->sf.lsf_sc;
#ifdef DEBUG_LINUX
printf("sigcontext is at %p\n", &sf->sf.lsf_sc);
#endif /* DEBUG_LINUX */
tf->tf_regs[_R_SP] = (intptr_t)sf;
/* Signal trampoline code is at base of user stack. */
tf->tf_regs[_R_RA] = (intptr_t)p->p_sigctx.ps_sigcode;
tf->tf_regs[_R_T9] = (intptr_t)catcher;
tf->tf_regs[_R_PC] = (intptr_t)catcher;
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
/*
* System call to cleanup state after a signal
* has been taken. Reset signal mask and
* stack state from context left by sendsig (above).
*/
int
linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct linux_sigframe *) sf;
} */
struct proc *p = l->l_proc;
union linux_ksigframe ksf, *sf;
#ifdef __mips_o32
const int abi = _MIPS_BSD_API_O32;
#else
const int abi = p->p_md.md_abi;
#endif
linux_sigset_t *lmask;
sigset_t mask;
int error;
/*
* The trampoline code hands us the context.
* It is unsafe to keep track of it ourselves, in the event that a
* program jumps out of a signal handler.
*/
sf = (void *)SCARG(uap, sf);
if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0)
return (error);
/*
* major device numbers remapping
*/
dev_t
linux_fakedev(dev_t dev, int raw)
{
/* XXX write me */
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)
{
return 0;
}
/*
* See above. If a root process tries to set access to an I/O port,
* just let it have the whole range.
*/
int
linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *uap, register_t *retval)
{
/*
* This syscall is not implemented in Linux/Mips: we should not be here
*/
#ifdef DEBUG_LINUX
printf("linux_sys_ioperm: should not be here.\n");
#endif /* DEBUG_LINUX */
return 0;
}
/*
* wrapper linux_sys_new_uname() -> linux_sys_uname()
*/
int
linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval)
{
/*
* Use this if you want to try Linux emulation with a glibc-2.2
* or higher. Note that signals will not work
*/
#if 0
struct linux_sys_uname_args /* {
syscallarg(struct linux_utsname *) up;
} */ *uap = v;
struct linux_utsname luts;
/*
* In Linux, cacheflush is currently implemented
* as a whole cache flush (arguments are ignored)
* we emulate this broken beahior.
*/
int
linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval)
{
mips_icache_sync_all();
mips_dcache_wbinv_all();
return 0;
}
/*
* This system call is depecated in Linux, but
* some binaries and some libraries use it.
*/
int
linux_sys_sysmips(struct lwp *l, const struct linux_sys_sysmips_args *uap, register_t *retval)
{
/* {
syscallarg(long) cmd;
syscallarg(long) arg1;
syscallarg(long) arg2;
syscallarg(long) arg3;
} */
int error;
switch (SCARG(uap, cmd)) {
case LINUX_SETNAME: {
char nodename [LINUX___NEW_UTS_LEN + 1];
int name[2];
size_t len;
break;
}
case LINUX_MIPS_ATOMIC_SET: {
void *addr;
int s;
u_int8_t value = 0;
addr = (void *)SCARG(uap, arg1);
s = splhigh();
/*
* No error testing here. This is bad, but Linux does
* it like this. The source aknowledge "This is broken"
* in a comment...
*/
(void) copyin(addr, &value, 1);
*retval = value;
value = (u_int8_t) SCARG(uap, arg2);
error = copyout(&value, addr, 1);
splx(s);