294 lines
7.1 KiB
C
294 lines
7.1 KiB
C
/*
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* Copyright (c) 2004 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ktr.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/syscall.h>
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#include <sys/sysent.h>
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#include <machine/cpu.h>
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#include <machine/fpu.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <i386/include/psl.h>
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#ifdef WITNESS
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extern char *syscallnames[];
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#endif
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static void
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ia32_syscall(struct trapframe *tf)
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{
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uint64_t args64[8];
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uint32_t args[8];
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struct thread *td;
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struct proc *p;
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struct sysent *callp;
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caddr_t params;
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register_t eflags;
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u_int code;
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int error, i, narg;
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atomic_add_int(&cnt.v_syscall, 1);
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td = curthread;
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params = (caddr_t)(tf->tf_special.sp & ((1L<<32)-1)) +
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sizeof(uint32_t);
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code = tf->tf_scratch.gr8; /* eax */
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eflags = ia64_get_eflag();
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p = td->td_proc;
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if (p->p_sysent->sv_prepsyscall == NULL) {
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if (code == SYS_syscall) {
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/* Code is first argument, followed by actual args. */
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code = fuword32(params);
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params += sizeof(int);
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} else if (code == SYS___syscall) {
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/*
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* Like syscall, but code is a quad, so as to maintain
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* quad alignment for the rest of the arguments. We
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* use a 32-bit fetch in case params is not aligned.
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*/
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code = fuword32(params);
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params += sizeof(quad_t);
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}
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} else
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(*p->p_sysent->sv_prepsyscall)(tf, args, &code, ¶ms);
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if (p->p_sysent->sv_mask)
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code &= p->p_sysent->sv_mask;
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if (code >= p->p_sysent->sv_size)
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callp = &p->p_sysent->sv_table[0];
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else
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callp = &p->p_sysent->sv_table[code];
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narg = callp->sy_narg & SYF_ARGMASK;
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/* copyin and the ktrsyscall()/ktrsysret() code is MP-aware */
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if (params != NULL && narg != 0)
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error = copyin(params, (caddr_t)args, narg * sizeof(int));
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else
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error = 0;
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for (i = 0; i < narg; i++)
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args64[i] = args[i];
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_SYSCALL))
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ktrsyscall(code, narg, args64);
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#endif
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/*
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* Try to run the syscall without Giant if the syscall
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* is MP safe.
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*/
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if ((callp->sy_narg & SYF_MPSAFE) == 0)
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mtx_lock(&Giant);
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if (error == 0) {
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td->td_retval[0] = 0;
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td->td_retval[1] = tf->tf_scratch.gr10; /* edx */
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STOPEVENT(p, S_SCE, narg);
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error = (*callp->sy_call)(td, args64);
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}
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switch (error) {
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case 0:
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tf->tf_scratch.gr8 = td->td_retval[0]; /* eax */
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tf->tf_scratch.gr10 = td->td_retval[1]; /* edx */
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ia64_set_eflag(ia64_get_eflag() & ~PSL_C);
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break;
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case ERESTART:
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/*
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* Reconstruct pc, assuming lcall $X,y is 7 bytes,
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* int 0x80 is 2 bytes. XXX Assume int 0x80.
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*/
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tf->tf_special.iip -= 2;
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break;
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case EJUSTRETURN:
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break;
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default:
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if (p->p_sysent->sv_errsize) {
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if (error >= p->p_sysent->sv_errsize)
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error = -1; /* XXX */
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else
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error = p->p_sysent->sv_errtbl[error];
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}
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tf->tf_scratch.gr8 = error;
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ia64_set_eflag(ia64_get_eflag() | PSL_C);
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break;
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}
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/*
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* Release Giant if we previously set it.
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*/
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if ((callp->sy_narg & SYF_MPSAFE) == 0)
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mtx_unlock(&Giant);
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/*
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* Traced syscall.
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*/
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if ((eflags & PSL_T) && !(eflags & PSL_VM)) {
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ia64_set_eflag(ia64_get_eflag() & ~PSL_T);
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trapsignal(td, SIGTRAP, 0);
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}
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#ifdef KTRACE
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if (KTRPOINT(td, KTR_SYSRET))
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ktrsysret(code, error, td->td_retval[0]);
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#endif
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/*
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* This works because errno is findable through the
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* register set. If we ever support an emulation where this
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* is not the case, this code will need to be revisited.
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*/
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STOPEVENT(p, S_SCX, code);
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WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning",
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(code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???");
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mtx_assert(&sched_lock, MA_NOTOWNED);
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mtx_assert(&Giant, MA_NOTOWNED);
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}
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/*
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* ia32_trap() is called from exception.S to handle the IA-32 specific
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* interruption vectors.
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*/
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void
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ia32_trap(int vector, struct trapframe *tf)
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{
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struct proc *p;
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struct thread *td;
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uint64_t ucode;
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int sig;
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u_int sticks;
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KASSERT(TRAPF_USERMODE(tf), ("%s: In kernel mode???", __func__));
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ia64_set_fpsr(IA64_FPSR_DEFAULT);
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atomic_add_int(&cnt.v_trap, 1);
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td = curthread;
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td->td_frame = tf;
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sticks = td->td_sticks;
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p = td->td_proc;
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if (td->td_ucred != p->p_ucred)
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cred_update_thread(td);
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sig = 0;
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ucode = 0;
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switch (vector) {
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case IA64_VEC_IA32_EXCEPTION:
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switch ((tf->tf_special.isr >> 16) & 0xffff) {
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case IA32_EXCEPTION_DIVIDE:
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ucode = FPE_INTDIV;
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sig = SIGFPE;
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break;
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case IA32_EXCEPTION_DEBUG:
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case IA32_EXCEPTION_BREAK:
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sig = SIGTRAP;
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break;
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case IA32_EXCEPTION_OVERFLOW:
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ucode = FPE_INTOVF;
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sig = SIGFPE;
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break;
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case IA32_EXCEPTION_BOUND:
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ucode = FPE_FLTSUB;
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sig = SIGFPE;
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break;
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case IA32_EXCEPTION_DNA:
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ucode = 0;
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sig = SIGFPE;
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break;
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case IA32_EXCEPTION_NOT_PRESENT:
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case IA32_EXCEPTION_STACK_FAULT:
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case IA32_EXCEPTION_GPFAULT:
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ucode = (tf->tf_special.isr & 0xffff) + BUS_SEGM_FAULT;
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sig = SIGBUS;
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break;
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case IA32_EXCEPTION_FPERROR:
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ucode = 0; /* XXX */
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sig = SIGFPE;
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break;
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case IA32_EXCEPTION_ALIGNMENT_CHECK:
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ucode = tf->tf_special.ifa; /* VA */
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sig = SIGBUS;
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break;
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case IA32_EXCEPTION_STREAMING_SIMD:
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ucode = 0; /* XXX */
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sig = SIGFPE;
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break;
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default:
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trap_panic(vector, tf);
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break;
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}
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break;
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case IA64_VEC_IA32_INTERCEPT:
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/* XXX Maybe need to emulate ia32 instruction. */
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trap_panic(vector, tf);
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case IA64_VEC_IA32_INTERRUPT:
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/* INT n instruction - probably a syscall. */
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if (((tf->tf_special.isr >> 16) & 0xffff) == 0x80) {
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ia32_syscall(tf);
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goto out;
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}
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ucode = (tf->tf_special.isr >> 16) & 0xffff;
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sig = SIGILL;
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break;
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default:
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/* Should never happen of course. */
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trap_panic(vector, tf);
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break;
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}
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KASSERT(sig != 0, ("%s: signal not set", __func__));
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trapsignal(td, sig, ucode);
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out:
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userret(td, tf, sticks);
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mtx_assert(&Giant, MA_NOTOWNED);
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do_ast(tf);
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}
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