NetBSD-5.0.2/sys/arch/i386/i386/freebsd_machdep.c
/* $NetBSD: freebsd_machdep.c,v 1.52 2008/09/19 19:15:58 christos Exp $ */
/*-
* Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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: freebsd_machdep.c,v 1.52 2008/09/19 19:15:58 christos Exp $");
#if defined(_KERNEL_OPT)
#include "opt_vm86.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/proc.h>
#include <sys/exec.h>
#include <sys/user.h>
#include <sys/mount.h>
#include <compat/sys/signal.h>
#include <machine/cpufunc.h>
#include <machine/npx.h>
#include <machine/reg.h>
#include <machine/vm86.h>
#include <machine/vmparam.h>
#include <machine/freebsd_machdep.h>
#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/freebsd/freebsd_exec.h>
#include <compat/freebsd/freebsd_signal.h>
#include <compat/freebsd/freebsd_ptrace.h>
void
freebsd_setregs(l, epp, stack)
struct lwp *l;
struct exec_package *epp;
u_long stack;
{
struct pcb *pcb = &l->l_addr->u_pcb;
setregs(l, epp, stack);
if (i386_use_fxsave)
pcb->pcb_savefpu.sv_xmm.sv_env.en_cw = __FreeBSD_NPXCW__;
else
pcb->pcb_savefpu.sv_87.sv_env.en_cw = __FreeBSD_NPXCW__;
}
/*
* signal support
*/
/*
* Send an interrupt to process.
*
* Stack is set up to allow sigcode stored
* in u. to call routine, followed by kcall
* to sigreturn routine below. After sigreturn
* resets the signal mask, the stack, and the
* frame pointer, it returns to the user
* specified pc, psl.
*/
void
freebsd_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
int sig = ksi->ksi_signo;
u_long code = KSI_TRAPCODE(ksi);
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
int onstack, error;
struct freebsd_sigframe *fp = getframe(l, sig, &onstack), frame;
sig_t catcher = SIGACTION(p, sig).sa_handler;
struct trapframe *tf = l->l_md.md_regs;
fp--;
/* Build stack frame for signal trampoline. */
frame.sf_signum = sig;
frame.sf_code = code;
frame.sf_scp = &fp->sf_sc;
frame.sf_addr = (char *)rcr2();
frame.sf_handler = catcher;
/* Save context. */
#ifdef VM86
if (tf->tf_eflags & PSL_VM) {
frame.sf_sc.sc_gs = tf->tf_vm86_gs;
frame.sf_sc.sc_fs = tf->tf_vm86_fs;
frame.sf_sc.sc_es = tf->tf_vm86_es;
frame.sf_sc.sc_ds = tf->tf_vm86_ds;
frame.sf_sc.sc_efl = get_vflags(l);
(*p->p_emul->e_syscall_intern)(p);
} else
#endif
{
frame.sf_sc.sc_gs = tf->tf_gs;
frame.sf_sc.sc_fs = tf->tf_fs;
frame.sf_sc.sc_es = tf->tf_es;
frame.sf_sc.sc_ds = tf->tf_ds;
frame.sf_sc.sc_efl = tf->tf_eflags;
}
frame.sf_sc.sc_edi = tf->tf_edi;
frame.sf_sc.sc_esi = tf->tf_esi;
frame.sf_sc.sc_ebp = tf->tf_ebp;
frame.sf_sc.sc_isp = 0; /* don't have to pass kernel sp to user. */
frame.sf_sc.sc_ebx = tf->tf_ebx;
frame.sf_sc.sc_edx = tf->tf_edx;
frame.sf_sc.sc_ecx = tf->tf_ecx;
frame.sf_sc.sc_eax = tf->tf_eax;
frame.sf_sc.sc_eip = tf->tf_eip;
frame.sf_sc.sc_cs = tf->tf_cs;
frame.sf_sc.sc_esp = tf->tf_esp;
frame.sf_sc.sc_ss = tf->tf_ss;
/* Save signal stack. */
frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
/* XXX freebsd_osigcontext compat? */
frame.sf_sc.sc_mask = *mask;
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&frame, fp, sizeof(frame));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
buildcontext(l, GUCODEBIG_SEL, p->p_sigctx.ps_sigcode, fp);
/* 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).
* Return to previous pc and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psl to gain improper privileges or to cause
* a machine fault.
*/
int
freebsd_sys_sigreturn(struct lwp *l, const struct freebsd_sys_sigreturn_args *uap, register_t *retval)
{
/* {
syscallarg(struct freebsd_sigcontext *) scp;
} */
struct proc *p = l->l_proc;
struct freebsd_sigcontext *scp, context;
struct trapframe *tf;
sigset_t mask;
/*
* 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.
*/
scp = SCARG(uap, scp);
if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
return (EFAULT);
/* Restore register context. */
tf = l->l_md.md_regs;
#ifdef VM86
if (context.sc_efl & PSL_VM) {
void syscall_vm86(struct trapframe *);
tf->tf_vm86_gs = context.sc_gs;
tf->tf_vm86_fs = context.sc_fs;
tf->tf_vm86_es = context.sc_es;
tf->tf_vm86_ds = context.sc_ds;
set_vflags(l, context.sc_efl);
p->p_md.md_syscall = syscall_vm86;
} else
#endif
{
/*
* Check for security violations. If we're returning to
* protected mode, the CPU will validate the segment registers
* automatically and generate a trap on violations. We handle
* the trap, rather than doing all of the checking here.
*/
if (((context.sc_efl ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
!USERMODE(context.sc_cs, context.sc_efl))
return (EINVAL);
tf->tf_gs = context.sc_gs;
tf->tf_fs = context.sc_fs;
tf->tf_es = context.sc_es;
tf->tf_ds = context.sc_ds;
tf->tf_eflags &= ~PSL_USER;
tf->tf_eflags |= context.sc_efl & PSL_USER;
}
tf->tf_edi = context.sc_edi;
tf->tf_esi = context.sc_esi;
tf->tf_ebp = context.sc_ebp;
/* FreeBSD's context.sc_isp is useless. (`popal' ignores it.) */
tf->tf_ebx = context.sc_ebx;
tf->tf_edx = context.sc_edx;
tf->tf_ecx = context.sc_ecx;
tf->tf_eax = context.sc_eax;
tf->tf_eip = context.sc_eip;
tf->tf_cs = context.sc_cs;
tf->tf_esp = context.sc_esp;
tf->tf_ss = context.sc_ss;
mutex_enter(p->p_lock);
/* Restore signal stack. */
if (context.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
/* XXX freebsd_osigcontext compat? */
mask = context.sc_mask;
(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
/*
* freebsd_ptrace(2) support
*/
void
netbsd_to_freebsd_ptrace_regs(nregs, nfpregs, fregs)
struct reg *nregs;
struct fpreg *nfpregs;
struct freebsd_ptrace_reg *fregs;
{
struct save87 *nframe = (struct save87 *)nfpregs;
fregs->freebsd_ptrace_regs.tf_es = nregs->r_es;
fregs->freebsd_ptrace_regs.tf_ds = nregs->r_ds;
fregs->freebsd_ptrace_regs.tf_edi = nregs->r_edi;
fregs->freebsd_ptrace_regs.tf_esi = nregs->r_esi;
fregs->freebsd_ptrace_regs.tf_ebp = nregs->r_ebp;
fregs->freebsd_ptrace_regs.tf_isp = 0;
fregs->freebsd_ptrace_regs.tf_ebx = nregs->r_ebx;
fregs->freebsd_ptrace_regs.tf_edx = nregs->r_edx;
fregs->freebsd_ptrace_regs.tf_ecx = nregs->r_ecx;
fregs->freebsd_ptrace_regs.tf_eax = nregs->r_eax;
fregs->freebsd_ptrace_regs.tf_trapno = 0;
fregs->freebsd_ptrace_regs.tf_err = 0;
fregs->freebsd_ptrace_regs.tf_eip = nregs->r_eip;
fregs->freebsd_ptrace_regs.tf_cs = nregs->r_cs;
fregs->freebsd_ptrace_regs.tf_eflags = nregs->r_eflags;
fregs->freebsd_ptrace_regs.tf_esp = nregs->r_esp;
fregs->freebsd_ptrace_regs.tf_ss = nregs->r_ss;
fregs->freebsd_ptrace_fpregs.sv_env =
*(struct freebsd_env87 *)&nframe->sv_env;
memcpy(fregs->freebsd_ptrace_fpregs.sv_ac, nframe->sv_ac,
sizeof(fregs->freebsd_ptrace_fpregs.sv_ac));
fregs->freebsd_ptrace_fpregs.sv_ex_sw =
nframe->sv_ex_sw;
/*
* fortunately, sizeof(freebsd_save87) >= sizeof(save87)
*/
#ifdef DIAGNOSTIC
if (sizeof(fregs->freebsd_ptrace_fpregs.sv_pad) <
sizeof(nframe->sv_ex_tw) + sizeof(nframe->sv_pad)) {
panic("netbsd_to_freebsd_ptrace_regs: %s",
"sizeof(freebsd_save87) >= sizeof(save87)");
}
#endif
memcpy(fregs->freebsd_ptrace_fpregs.sv_pad, &nframe->sv_ex_tw,
sizeof(nframe->sv_ex_tw));
memcpy((char *)fregs->freebsd_ptrace_fpregs.sv_pad +
sizeof(nframe->sv_ex_tw),
nframe->sv_pad,
sizeof(nframe->sv_pad));
memset((char *)fregs->freebsd_ptrace_fpregs.sv_pad +
sizeof(nframe->sv_ex_tw) + sizeof(nframe->sv_pad),
0,
sizeof(fregs->freebsd_ptrace_fpregs.sv_pad) -
sizeof(nframe->sv_ex_tw) - sizeof(nframe->sv_pad));
}
void
freebsd_to_netbsd_ptrace_regs(fregs, nregs, nfpregs)
struct freebsd_ptrace_reg *fregs;
struct reg *nregs;
struct fpreg *nfpregs;
{
struct save87 *nframe = (struct save87 *)nfpregs;
nregs->r_es = fregs->freebsd_ptrace_regs.tf_es;
nregs->r_ds = fregs->freebsd_ptrace_regs.tf_ds;
nregs->r_edi = fregs->freebsd_ptrace_regs.tf_edi;
nregs->r_esi = fregs->freebsd_ptrace_regs.tf_esi;
nregs->r_ebp = fregs->freebsd_ptrace_regs.tf_ebp;
nregs->r_ebx = fregs->freebsd_ptrace_regs.tf_ebx;
nregs->r_edx = fregs->freebsd_ptrace_regs.tf_edx;
nregs->r_ecx = fregs->freebsd_ptrace_regs.tf_ecx;
nregs->r_eax = fregs->freebsd_ptrace_regs.tf_eax;
nregs->r_eip = fregs->freebsd_ptrace_regs.tf_eip;
nregs->r_cs = fregs->freebsd_ptrace_regs.tf_cs;
nregs->r_eflags = fregs->freebsd_ptrace_regs.tf_eflags;
nregs->r_esp = fregs->freebsd_ptrace_regs.tf_esp;
nregs->r_ss = fregs->freebsd_ptrace_regs.tf_ss;
nframe->sv_env =
*(struct env87 *)&fregs->freebsd_ptrace_fpregs.sv_env;
memcpy(nframe->sv_ac, fregs->freebsd_ptrace_fpregs.sv_ac,
sizeof(nframe->sv_ac));
nframe->sv_ex_sw =
fregs->freebsd_ptrace_fpregs.sv_ex_sw;
/*
* fortunately, sizeof(freebsd_save87) >= sizeof(save87)
*/
memcpy(&nframe->sv_ex_tw, fregs->freebsd_ptrace_fpregs.sv_pad,
sizeof(nframe->sv_ex_tw));
memcpy(nframe->sv_pad,
(char *)fregs->freebsd_ptrace_fpregs.sv_pad +
sizeof(nframe->sv_ex_tw),
sizeof(nframe->sv_pad));
}
/* random value, except FREEBSD_U_AR0_OFFSET..., FREEBSD_U_SAVEFP_OFFSET... */
#define FREEBSD_REGS_OFFSET 0x2000
int
freebsd_ptrace_getregs(fregs, addr, datap)
struct freebsd_ptrace_reg *fregs;
void *addr;
register_t *datap;
{
vaddr_t offset = (vaddr_t)addr;
if (offset == FREEBSD_U_AR0_OFFSET) {
*datap = FREEBSD_REGS_OFFSET + FREEBSD_USRSTACK;
return 0;
} else if (offset >= FREEBSD_REGS_OFFSET &&
offset <= FREEBSD_REGS_OFFSET +
sizeof(fregs->freebsd_ptrace_regs)-sizeof(register_t)) {
*datap = *(register_t *)&((char *)&fregs->freebsd_ptrace_regs)
[(vaddr_t) addr - FREEBSD_REGS_OFFSET];
return 0;
} else if (offset >= FREEBSD_U_SAVEFP_OFFSET &&
offset <= FREEBSD_U_SAVEFP_OFFSET +
sizeof(fregs->freebsd_ptrace_fpregs)-sizeof(register_t)){
*datap= *(register_t *)&((char *)&fregs->freebsd_ptrace_fpregs)
[offset - FREEBSD_U_SAVEFP_OFFSET];
return 0;
}
#ifdef DIAGNOSTIC
printf("freebsd_ptrace_getregs: *(0x%08lx)\n", offset);
#endif
return EFAULT;
}
int
freebsd_ptrace_setregs(fregs, addr, data)
struct freebsd_ptrace_reg *fregs;
void *addr;
int data;
{
vaddr_t offset = (vaddr_t)addr;
if (offset >= FREEBSD_REGS_OFFSET &&
offset <= FREEBSD_REGS_OFFSET +
sizeof(fregs->freebsd_ptrace_regs) - sizeof(int)) {
*(int *)&((char *)&fregs->freebsd_ptrace_regs)
[offset - FREEBSD_REGS_OFFSET] = data;
return 0;
} else if (offset >= FREEBSD_U_SAVEFP_OFFSET &&
offset <= FREEBSD_U_SAVEFP_OFFSET +
sizeof(fregs->freebsd_ptrace_fpregs) - sizeof(int)) {
*(int *)&((char *)&fregs->freebsd_ptrace_fpregs)
[offset - FREEBSD_U_SAVEFP_OFFSET] = data;
return 0;
}
#ifdef DIAGNOSTIC
printf("freebsd_ptrace_setregs: *(0x%08lx) = 0x%08x\n", offset, data);
#endif
return EFAULT;
}