4cd2d525e3
is highly MD in an emulation environment since it operates on the host environment. Although the setregs functions are really for exec support rather than signals, they deal with the same sorts of context and include files. So I put it there rather than create yet another file.
602 lines
18 KiB
C
602 lines
18 KiB
C
/*-
|
|
* Copyright (c) 2003 Peter Wemm
|
|
* Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_compat.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/pioctl.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/procfs.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_kern.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_extern.h>
|
|
|
|
#include <compat/freebsd32/freebsd32_util.h>
|
|
#include <compat/freebsd32/freebsd32_proto.h>
|
|
#include <compat/ia32/ia32_signal.h>
|
|
#include <machine/psl.h>
|
|
#include <machine/segments.h>
|
|
#include <machine/specialreg.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/pcb.h>
|
|
#include <machine/cpufunc.h>
|
|
|
|
#ifdef COMPAT_FREEBSD4
|
|
static void freebsd4_ia32_sendsig(sig_t, int, sigset_t *, u_long);
|
|
#endif
|
|
static void ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp);
|
|
static int ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp);
|
|
|
|
extern int _ucode32sel, _udatasel;
|
|
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
|
|
static void
|
|
ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp)
|
|
{
|
|
struct savefpu *addr;
|
|
|
|
/*
|
|
* XXX mc_fpstate might be misaligned, since its declaration is not
|
|
* unportabilized using __attribute__((aligned(16))) like the
|
|
* declaration of struct savemm, and anyway, alignment doesn't work
|
|
* for auto variables since we don't use gcc's pessimal stack
|
|
* alignment. Work around this by abusing the spare fields after
|
|
* mcp->mc_fpstate.
|
|
*
|
|
* XXX unpessimize most cases by only aligning when fxsave might be
|
|
* called, although this requires knowing too much about
|
|
* fpugetregs()'s internals.
|
|
*/
|
|
addr = (struct savefpu *)&mcp->mc_fpstate;
|
|
if (td == PCPU_GET(fpcurthread) && ((uintptr_t)(void *)addr & 0xF)) {
|
|
do
|
|
addr = (void *)((char *)addr + 4);
|
|
while ((uintptr_t)(void *)addr & 0xF);
|
|
}
|
|
mcp->mc_ownedfp = fpugetregs(td, addr);
|
|
if (addr != (struct savefpu *)&mcp->mc_fpstate) {
|
|
bcopy(addr, &mcp->mc_fpstate, sizeof(mcp->mc_fpstate));
|
|
bzero(&mcp->mc_spare2, sizeof(mcp->mc_spare2));
|
|
}
|
|
mcp->mc_fpformat = fpuformat();
|
|
}
|
|
|
|
static int
|
|
ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp)
|
|
{
|
|
struct savefpu *addr;
|
|
|
|
if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
|
|
return (0);
|
|
else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
|
|
return (EINVAL);
|
|
else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
|
|
/* We don't care what state is left in the FPU or PCB. */
|
|
fpstate_drop(td);
|
|
else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
|
|
mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
|
|
/* XXX align as above. */
|
|
addr = (struct savefpu *)&mcp->mc_fpstate;
|
|
if (td == PCPU_GET(fpcurthread) &&
|
|
((uintptr_t)(void *)addr & 0xF)) {
|
|
do
|
|
addr = (void *)((char *)addr + 4);
|
|
while ((uintptr_t)(void *)addr & 0xF);
|
|
bcopy(&mcp->mc_fpstate, addr, sizeof(mcp->mc_fpstate));
|
|
}
|
|
/*
|
|
* XXX we violate the dubious requirement that fpusetregs()
|
|
* be called with interrupts disabled.
|
|
*/
|
|
fpusetregs(td, addr);
|
|
/*
|
|
* Don't bother putting things back where they were in the
|
|
* misaligned case, since we know that the caller won't use
|
|
* them again.
|
|
*/
|
|
} else
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Send an interrupt to process.
|
|
*
|
|
* Stack is set up to allow sigcode stored
|
|
* at top 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.
|
|
*/
|
|
#ifdef COMPAT_FREEBSD4
|
|
static void
|
|
freebsd4_ia32_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
|
|
{
|
|
struct ia32_sigframe4 sf, *sfp;
|
|
struct proc *p;
|
|
struct thread *td;
|
|
struct sigacts *psp;
|
|
struct trapframe *regs;
|
|
int oonstack;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
psp = p->p_sigacts;
|
|
regs = td->td_frame;
|
|
oonstack = sigonstack(regs->tf_rsp);
|
|
|
|
/* Save user context. */
|
|
bzero(&sf, sizeof(sf));
|
|
sf.sf_uc.uc_sigmask = *mask;
|
|
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)p->p_sigstk.ss_sp;
|
|
sf.sf_uc.uc_stack.ss_size = p->p_sigstk.ss_size;
|
|
sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
|
|
sf.sf_uc.uc_mcontext.mc_gs = rgs();
|
|
sf.sf_uc.uc_mcontext.mc_fs = rfs();
|
|
__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
|
|
__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
|
|
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
|
|
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
|
|
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
|
|
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
|
|
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
|
|
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
|
|
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
|
|
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
|
|
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
|
|
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
|
|
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
|
|
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
|
|
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
|
|
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
|
|
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
|
|
|
|
/* Allocate space for the signal handler context. */
|
|
if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig)) {
|
|
sfp = (struct ia32_sigframe4 *)(p->p_sigstk.ss_sp +
|
|
p->p_sigstk.ss_size - sizeof(sf));
|
|
} else
|
|
sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Translate the signal if appropriate. */
|
|
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
/* Build the argument list for the signal handler. */
|
|
sf.sf_signum = sig;
|
|
sf.sf_ucontext = (register_t)&sfp->sf_uc;
|
|
PROC_LOCK(p);
|
|
if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
|
|
/* Fill in POSIX parts */
|
|
sf.sf_si.si_signo = sig;
|
|
sf.sf_si.si_code = code;
|
|
sf.sf_si.si_addr = regs->tf_addr;
|
|
} else {
|
|
/* Old FreeBSD-style arguments. */
|
|
sf.sf_siginfo = code;
|
|
sf.sf_addr = regs->tf_addr;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Copy the sigframe out to the user's stack.
|
|
*/
|
|
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
|
|
#ifdef DEBUG
|
|
printf("process %ld has trashed its stack\n", (long)p->p_pid);
|
|
#endif
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
regs->tf_rsp = (uintptr_t)sfp;
|
|
regs->tf_rip = FREEBSD32_PS_STRINGS - sz_freebsd4_ia32_sigcode;
|
|
regs->tf_rflags &= ~PSL_T;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_ss = _udatasel;
|
|
load_ds(_udatasel);
|
|
td->td_pcb->pcb_ds = _udatasel;
|
|
load_es(_udatasel);
|
|
td->td_pcb->pcb_es = _udatasel;
|
|
/* leave user %fs and %gs untouched */
|
|
PROC_LOCK(p);
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|
|
|
|
void
|
|
ia32_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
|
|
{
|
|
struct ia32_sigframe sf, *sfp;
|
|
struct proc *p;
|
|
struct thread *td;
|
|
struct sigacts *psp;
|
|
char *sp;
|
|
struct trapframe *regs;
|
|
int oonstack;
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
psp = p->p_sigacts;
|
|
#ifdef COMPAT_FREEBSD4
|
|
if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
|
|
freebsd4_ia32_sendsig(catcher, sig, mask, code);
|
|
return;
|
|
}
|
|
#endif
|
|
regs = td->td_frame;
|
|
oonstack = sigonstack(regs->tf_rsp);
|
|
|
|
/* Save user context. */
|
|
bzero(&sf, sizeof(sf));
|
|
sf.sf_uc.uc_sigmask = *mask;
|
|
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)p->p_sigstk.ss_sp;
|
|
sf.sf_uc.uc_stack.ss_size = p->p_sigstk.ss_size;
|
|
sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
|
|
sf.sf_uc.uc_mcontext.mc_gs = rgs();
|
|
sf.sf_uc.uc_mcontext.mc_fs = rfs();
|
|
__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
|
|
__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
|
|
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
|
|
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
|
|
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
|
|
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
|
|
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
|
|
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
|
|
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
|
|
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
|
|
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
|
|
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
|
|
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
|
|
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
|
|
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
|
|
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
|
|
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
|
|
sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
|
|
ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext);
|
|
fpstate_drop(td);
|
|
|
|
/* Allocate space for the signal handler context. */
|
|
if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig)) {
|
|
sp = p->p_sigstk.ss_sp +
|
|
p->p_sigstk.ss_size - sizeof(sf);
|
|
} else
|
|
sp = (char *)regs->tf_rsp - sizeof(sf);
|
|
/* Align to 16 bytes. */
|
|
sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Translate the signal if appropriate. */
|
|
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
/* Build the argument list for the signal handler. */
|
|
sf.sf_signum = sig;
|
|
sf.sf_ucontext = (register_t)&sfp->sf_uc;
|
|
PROC_LOCK(p);
|
|
if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
|
|
/* Fill in POSIX parts */
|
|
sf.sf_si.si_signo = sig;
|
|
sf.sf_si.si_code = code;
|
|
sf.sf_si.si_addr = regs->tf_addr;
|
|
} else {
|
|
/* Old FreeBSD-style arguments. */
|
|
sf.sf_siginfo = code;
|
|
sf.sf_addr = regs->tf_addr;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Copy the sigframe out to the user's stack.
|
|
*/
|
|
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
|
|
#ifdef DEBUG
|
|
printf("process %ld has trashed its stack\n", (long)p->p_pid);
|
|
#endif
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
regs->tf_rsp = (uintptr_t)sfp;
|
|
regs->tf_rip = FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
|
|
regs->tf_rflags &= ~PSL_T;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_ss = _udatasel;
|
|
load_ds(_udatasel);
|
|
td->td_pcb->pcb_ds = _udatasel;
|
|
load_es(_udatasel);
|
|
td->td_pcb->pcb_es = _udatasel;
|
|
/* leave user %fs and %gs untouched */
|
|
PROC_LOCK(p);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* state to gain improper privileges.
|
|
*/
|
|
#ifdef COMPAT_FREEBSD4
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd4_freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd4_freebsd32_sigreturn_args /* {
|
|
const struct freebsd4_freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext4 uc;
|
|
struct proc *p = td->td_proc;
|
|
struct trapframe *regs;
|
|
const struct ia32_ucontext4 *ucp;
|
|
int cs, eflags, error;
|
|
|
|
error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd4_freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("freebsd4_sigreturn: cs = 0x%x\n", cs);
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd32_sigreturn_args /* {
|
|
const struct freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext uc;
|
|
struct proc *p = td->td_proc;
|
|
struct trapframe *regs;
|
|
const struct ia32_ucontext *ucp;
|
|
int cs, eflags, error, ret;
|
|
|
|
error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("sigreturn: cs = 0x%x\n", cs);
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return (EINVAL);
|
|
}
|
|
|
|
ret = ia32_set_fpcontext(td, &ucp->uc_mcontext);
|
|
if (ret != 0)
|
|
return (ret);
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* Clear registers on exec
|
|
*/
|
|
void
|
|
ia32_setregs(td, entry, stack, ps_strings)
|
|
struct thread *td;
|
|
u_long entry;
|
|
u_long stack;
|
|
u_long ps_strings;
|
|
{
|
|
struct trapframe *regs = td->td_frame;
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
wrmsr(MSR_FSBASE, 0);
|
|
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
|
|
pcb->pcb_fsbase = 0;
|
|
pcb->pcb_gsbase = 0;
|
|
load_ds(_udatasel);
|
|
load_es(_udatasel);
|
|
load_fs(_udatasel);
|
|
load_gs(_udatasel);
|
|
pcb->pcb_ds = _udatasel;
|
|
pcb->pcb_es = _udatasel;
|
|
pcb->pcb_fs = _udatasel;
|
|
pcb->pcb_gs = _udatasel;
|
|
|
|
bzero((char *)regs, sizeof(struct trapframe));
|
|
regs->tf_rip = entry;
|
|
regs->tf_rsp = stack;
|
|
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
|
|
regs->tf_ss = _udatasel;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_rbx = ps_strings;
|
|
load_cr0(rcr0() | CR0_MP | CR0_TS);
|
|
fpstate_drop(td);
|
|
|
|
/* Return via doreti so that we can change to a different %cs */
|
|
pcb->pcb_flags |= PCB_FULLCTX;
|
|
td->td_retval[1] = 0;
|
|
}
|