/* $NetBSD: sunos_syscall.c,v 1.24 2019/04/06 03:06:26 thorpej Exp $ */ /*- * Portions Copyright (c) 2000 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. */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * from: Utah $Hdr: trap.c 1.37 92/12/20$ * * @(#)trap.c 8.5 (Berkeley) 1/4/94 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: sunos_syscall.c,v 1.24 2019/04/06 03:06:26 thorpej Exp $"); #ifdef _KERNEL_OPT #include "opt_execfmt.h" #endif #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/acct.h> #include <sys/kernel.h> #include <sys/syscall.h> #include <sys/syscallvar.h> #include <sys/syslog.h> #include <machine/psl.h> #include <machine/cpu.h> #include <machine/reg.h> #include <uvm/uvm_extern.h> #include <compat/sunos/sunos_syscall.h> #include <compat/sunos/sunos_exec.h> void sunos_syscall_intern(struct proc *); static void sunos_syscall_plain(register_t, struct lwp *, struct frame *); static void sunos_syscall_fancy(register_t, struct lwp *, struct frame *); void sunos_syscall_intern(struct proc *p) { if (trace_is_enabled(p)) p->p_md.md_syscall = sunos_syscall_fancy; else p->p_md.md_syscall = sunos_syscall_plain; } static void sunos_syscall_plain(register_t code, struct lwp *l, struct frame *frame) { struct proc *p = l->l_proc; char *params; const struct sysent *callp; int error, nsys; size_t argsize; register_t args[16], rval[2]; nsys = p->p_emul->e_nsysent; callp = p->p_emul->e_sysent; /* * SunOS passes the syscall-number on the stack, whereas * BSD passes it in D0. So, we have to get the real "code" * from the stack, and clean up the stack, as SunOS glue * code assumes the kernel pops the syscall argument the * glue pushed on the stack. Sigh... */ error = ufetch_long((void *)frame->f_regs[SP], (u_long *)&code); if (error) goto bad; /* * XXX * Don't do this for sunos_sigreturn, as there's no stored pc * on the stack to skip, the argument follows the syscall * number without a gap. */ if (code != SUNOS_SYS_sigreturn) { frame->f_regs[SP] += sizeof (int); /* * remember that we adjusted the SP, * might have to undo this if the system call * returns ERESTART. */ l->l_md.md_flags |= MDL_STACKADJ; } else l->l_md.md_flags &= ~MDL_STACKADJ; params = (char *)frame->f_regs[SP] + sizeof(int); switch (code) { case SUNOS_SYS_syscall: /* * Code is first argument, followed by actual args. */ error = ufetch_long((void *)params, (u_long *)&code); if (error) goto bad; params += sizeof(int); break; default: break; } if (code < 0 || code >= nsys) callp += p->p_emul->e_nosys; /* illegal */ else callp += code; argsize = callp->sy_argsize; if (argsize) { error = copyin(params, (void *)args, argsize); if (error) goto bad; } rval[0] = 0; rval[1] = frame->f_regs[D1]; error = sy_call(callp, l, args, rval); switch (error) { case 0: /* * Reinitialize proc pointer `p' as it may be different * if this is a child returning from fork syscall. */ p = curproc; frame->f_regs[D0] = rval[0]; frame->f_regs[D1] = rval[1]; frame->f_sr &= ~PSL_C; /* carry bit */ break; case ERESTART: /* * We always enter through a `trap' instruction, which is 2 * bytes, so adjust the pc by that amount. */ frame->f_pc = frame->f_pc - 2; break; case EJUSTRETURN: /* nothing to do */ break; default: bad: frame->f_regs[D0] = error; frame->f_sr |= PSL_C; /* carry bit */ break; } /* need new p-value for this */ if (l->l_md.md_flags & MDL_STACKADJ) { l->l_md.md_flags &= ~MDL_STACKADJ; if (error == ERESTART) frame->f_regs[SP] -= sizeof (int); } } static void sunos_syscall_fancy(register_t code, struct lwp *l, struct frame *frame) { struct proc *p = l->l_proc; char *params; const struct sysent *callp; int error, nsys; size_t argsize; register_t args[16], rval[2]; nsys = p->p_emul->e_nsysent; callp = p->p_emul->e_sysent; /* * SunOS passes the syscall-number on the stack, whereas * BSD passes it in D0. So, we have to get the real "code" * from the stack, and clean up the stack, as SunOS glue * code assumes the kernel pops the syscall argument the * glue pushed on the stack. Sigh... */ error = ufetch_long((void *)frame->f_regs[SP], (u_long *)&code); if (error) goto bad; /* * XXX * Don't do this for sunos_sigreturn, as there's no stored pc * on the stack to skip, the argument follows the syscall * number without a gap. */ if (code != SUNOS_SYS_sigreturn) { frame->f_regs[SP] += sizeof (int); /* * remember that we adjusted the SP, * might have to undo this if the system call * returns ERESTART. */ l->l_md.md_flags |= MDL_STACKADJ; } else l->l_md.md_flags &= ~MDL_STACKADJ; params = (char *)frame->f_regs[SP] + sizeof(int); switch (code) { case SUNOS_SYS_syscall: /* * Code is first argument, followed by actual args. */ error = ufetch_long((void *)params, (u_long *)&code); if (error) goto bad; params += sizeof(int); break; default: break; } if (code < 0 || code >= nsys) callp += p->p_emul->e_nosys; /* illegal */ else callp += code; argsize = callp->sy_argsize; if (argsize) { error = copyin(params, (void *)args, argsize); if (error) goto bad; } if ((error = trace_enter(code, callp, args)) != 0) goto out; rval[0] = 0; rval[1] = frame->f_regs[D1]; error = sy_call(callp, l, args, rval); out: switch (error) { case 0: /* * Reinitialize proc pointer `p' as it may be different * if this is a child returning from fork syscall. */ p = curproc; frame->f_regs[D0] = rval[0]; frame->f_regs[D1] = rval[1]; frame->f_sr &= ~PSL_C; /* carry bit */ break; case ERESTART: /* * We always enter through a `trap' instruction, which is 2 * bytes, so adjust the pc by that amount. */ frame->f_pc = frame->f_pc - 2; break; case EJUSTRETURN: /* nothing to do */ break; default: bad: frame->f_regs[D0] = error; frame->f_sr |= PSL_C; /* carry bit */ break; } /* need new p-value for this */ if (l->l_md.md_flags & MDL_STACKADJ) { l->l_md.md_flags &= ~MDL_STACKADJ; if (error == ERESTART) frame->f_regs[SP] -= sizeof (int); } trace_exit(code, callp, args, rval, error); }
