22eca0bf45
ABI and the direction flag, that is it now assumes that the direction
flag is cleared at the entry of a function and it doesn't clear once
more if needed. This new behaviour conforms to the i386/amd64 ABI.
Modify the signal handler frame setup code to clear the DF {e,r}flags
bit on the amd64/i386 for the signal handlers.
jhb@ noted that it might break old apps if they assumed DF == 1 would be
preserved in the signal handlers, but that such apps should be rare and
that older versions of gcc would not generate such apps.
Submitted by: Aurelien Jarno <aurelien aurel32 net>
PR: 121422
Reviewed by: jhb
MFC after: 2 weeks
612 lines
15 KiB
C
612 lines
15 KiB
C
/*-
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* Copyright (c) 1998 Mark Newton
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* Copyright (c) 1994 Christos Zoulas
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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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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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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/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/filedesc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signal.h>
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#include <sys/signalvar.h>
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#include <machine/cpu.h>
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#include <machine/cpufunc.h>
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#include <machine/psl.h>
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#include <machine/reg.h>
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#include <machine/specialreg.h>
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#include <machine/sysarch.h>
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#include <machine/vm86.h>
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#include <machine/vmparam.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <compat/svr4/svr4.h>
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#include <compat/svr4/svr4_types.h>
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#include <compat/svr4/svr4_signal.h>
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#include <i386/svr4/svr4_machdep.h>
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#include <compat/svr4/svr4_ucontext.h>
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#include <compat/svr4/svr4_proto.h>
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#include <compat/svr4/svr4_util.h>
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#undef sigcode
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#undef szsigcode
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extern int svr4_szsigcode;
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extern char svr4_sigcode[];
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extern int _udatasel, _ucodesel;
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static void svr4_getsiginfo(union svr4_siginfo *, int, u_long, caddr_t);
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#if !defined(__NetBSD__)
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/* taken from /sys/arch/i386/include/psl.h on NetBSD-1.3 */
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# define PSL_MBZ 0xffc08028
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# define PSL_USERSTATIC (PSL_USER | PSL_MBZ | PSL_IOPL | PSL_NT | PSL_VM | PSL_VIF | PSL_VIP)
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# define USERMODE(c, f) (ISPL(c) == SEL_UPL)
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#endif
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#if defined(__NetBSD__)
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void
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svr4_setregs(td, epp, stack)
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struct thread *td;
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struct exec_package *epp;
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u_long stack;
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{
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register struct pcb *pcb = td->td_pcb;
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pcb->pcb_savefpu.sv_env.en_cw = __SVR4_NPXCW__;
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setregs(td, epp, stack, 0UL);
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}
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#endif /* __NetBSD__ */
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void
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svr4_getcontext(td, uc, mask, oonstack)
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struct thread *td;
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struct svr4_ucontext *uc;
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sigset_t *mask;
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int oonstack;
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{
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struct proc *p = td->td_proc;
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struct trapframe *tf = td->td_frame;
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svr4_greg_t *r = uc->uc_mcontext.greg;
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struct svr4_sigaltstack *s = &uc->uc_stack;
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#if defined(DONE_MORE_SIGALTSTACK_WORK)
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struct sigacts *psp;
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struct sigaltstack *sf;
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#endif
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PROC_LOCK(p);
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#if defined(DONE_MORE_SIGALTSTACK_WORK)
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psp = p->p_sigacts;
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sf = &p->p_sigstk;
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#endif
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memset(uc, 0, sizeof(struct svr4_ucontext));
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uc->uc_link = p->p_emuldata;
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/*
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* Set the general purpose registers
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*/
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#ifdef VM86
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if (tf->tf_eflags & PSL_VM) {
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r[SVR4_X86_GS] = tf->tf_vm86_gs;
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r[SVR4_X86_FS] = tf->tf_vm86_fs;
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r[SVR4_X86_ES] = tf->tf_vm86_es;
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r[SVR4_X86_DS] = tf->tf_vm86_ds;
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r[SVR4_X86_EFL] = get_vflags(td);
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} else
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#endif
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{
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#if defined(__NetBSD__)
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__asm("movl %%gs,%w0" : "=r" (r[SVR4_X86_GS]));
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__asm("movl %%fs,%w0" : "=r" (r[SVR4_X86_FS]));
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#else
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r[SVR4_X86_GS] = rgs();
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r[SVR4_X86_FS] = tf->tf_fs;
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#endif
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r[SVR4_X86_ES] = tf->tf_es;
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r[SVR4_X86_DS] = tf->tf_ds;
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r[SVR4_X86_EFL] = tf->tf_eflags;
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}
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r[SVR4_X86_EDI] = tf->tf_edi;
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r[SVR4_X86_ESI] = tf->tf_esi;
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r[SVR4_X86_EBP] = tf->tf_ebp;
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r[SVR4_X86_ESP] = tf->tf_esp;
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r[SVR4_X86_EBX] = tf->tf_ebx;
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r[SVR4_X86_EDX] = tf->tf_edx;
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r[SVR4_X86_ECX] = tf->tf_ecx;
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r[SVR4_X86_EAX] = tf->tf_eax;
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r[SVR4_X86_TRAPNO] = tf->tf_trapno;
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r[SVR4_X86_ERR] = tf->tf_err;
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r[SVR4_X86_EIP] = tf->tf_eip;
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r[SVR4_X86_CS] = tf->tf_cs;
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r[SVR4_X86_UESP] = 0;
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r[SVR4_X86_SS] = tf->tf_ss;
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/*
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* Set the signal stack
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*/
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#if defined(DONE_MORE_SIGALTSTACK_WORK)
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bsd_to_svr4_sigaltstack(sf, s);
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#else
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s->ss_sp = (void *)(((u_long) tf->tf_esp) & ~(16384 - 1));
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s->ss_size = 16384;
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s->ss_flags = 0;
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#endif
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PROC_UNLOCK(p);
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/*
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* Set the signal mask
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*/
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bsd_to_svr4_sigset(mask, &uc->uc_sigmask);
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/*
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* Set the flags
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*/
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uc->uc_flags = SVR4_UC_SIGMASK|SVR4_UC_CPU|SVR4_UC_STACK;
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}
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/*
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* Set to ucontext specified. Reset signal mask and
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* stack state from context.
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* Return to previous pc and psl as specified by
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* context left by sendsig. Check carefully to
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* make sure that the user has not modified the
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* psl to gain improper privileges or to cause
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* a machine fault.
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*/
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int
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svr4_setcontext(td, uc)
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struct thread *td;
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struct svr4_ucontext *uc;
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{
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#if defined(DONE_MORE_SIGALTSTACK_WORK)
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struct sigacts *psp;
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#endif
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struct proc *p = td->td_proc;
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register struct trapframe *tf;
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svr4_greg_t *r = uc->uc_mcontext.greg;
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struct svr4_sigaltstack *s = &uc->uc_stack;
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struct sigaltstack *sf;
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sigset_t mask;
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PROC_LOCK(p);
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#if defined(DONE_MORE_SIGALTSTACK_WORK)
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psp = p->p_sigacts;
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#endif
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sf = &td->td_sigstk;
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/*
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* XXX:
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* Should we check the value of flags to determine what to restore?
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* What to do with uc_link?
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* What to do with floating point stuff?
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* Should we bother with the rest of the registers that we
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* set to 0 right now?
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*/
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if ((uc->uc_flags & SVR4_UC_CPU) == 0) {
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PROC_UNLOCK(p);
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return 0;
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}
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DPRINTF(("svr4_setcontext(%d)\n", p->p_pid));
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tf = td->td_frame;
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/*
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* Restore register context.
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*/
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#ifdef VM86
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#warning "VM86 doesn't work yet, please don't try to use it."
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if (r[SVR4_X86_EFL] & PSL_VM) {
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tf->tf_vm86_gs = r[SVR4_X86_GS];
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tf->tf_vm86_fs = r[SVR4_X86_FS];
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tf->tf_vm86_es = r[SVR4_X86_ES];
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tf->tf_vm86_ds = r[SVR4_X86_DS];
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set_vflags(td, r[SVR4_X86_EFL]);
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} else
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#endif
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{
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/*
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* Check for security violations. If we're returning to
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* protected mode, the CPU will validate the segment registers
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* automatically and generate a trap on violations. We handle
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* the trap, rather than doing all of the checking here.
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*/
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if (((r[SVR4_X86_EFL] ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
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!USERMODE(r[SVR4_X86_CS], r[SVR4_X86_EFL])) {
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PROC_UNLOCK(p);
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return (EINVAL);
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}
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#if defined(__NetBSD__)
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/* %fs and %gs were restored by the trampoline. */
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#else
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/* %gs was restored by the trampoline. */
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tf->tf_fs = r[SVR4_X86_FS];
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#endif
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tf->tf_es = r[SVR4_X86_ES];
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tf->tf_ds = r[SVR4_X86_DS];
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tf->tf_eflags = r[SVR4_X86_EFL];
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}
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tf->tf_edi = r[SVR4_X86_EDI];
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tf->tf_esi = r[SVR4_X86_ESI];
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tf->tf_ebp = r[SVR4_X86_EBP];
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tf->tf_ebx = r[SVR4_X86_EBX];
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tf->tf_edx = r[SVR4_X86_EDX];
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tf->tf_ecx = r[SVR4_X86_ECX];
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tf->tf_eax = r[SVR4_X86_EAX];
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tf->tf_trapno = r[SVR4_X86_TRAPNO];
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tf->tf_err = r[SVR4_X86_ERR];
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tf->tf_eip = r[SVR4_X86_EIP];
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tf->tf_cs = r[SVR4_X86_CS];
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tf->tf_ss = r[SVR4_X86_SS];
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tf->tf_esp = r[SVR4_X86_ESP];
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p->p_emuldata = uc->uc_link;
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/*
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* restore signal stack
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*/
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if (uc->uc_flags & SVR4_UC_STACK) {
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svr4_to_bsd_sigaltstack(s, sf);
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}
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/*
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* restore signal mask
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*/
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if (uc->uc_flags & SVR4_UC_SIGMASK) {
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#if defined(DEBUG_SVR4)
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{
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int i;
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for (i = 0; i < 4; i++)
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DPRINTF(("\tuc_sigmask[%d] = %lx\n", i,
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uc->uc_sigmask.bits[i]));
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}
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#endif
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svr4_to_bsd_sigset(&uc->uc_sigmask, &mask);
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SIG_CANTMASK(mask);
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td->td_sigmask = mask;
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signotify(td);
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}
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PROC_UNLOCK(p);
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return 0; /*EJUSTRETURN;*/
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}
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static void
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svr4_getsiginfo(si, sig, code, addr)
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union svr4_siginfo *si;
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int sig;
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u_long code;
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caddr_t addr;
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{
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si->svr4_si_signo = bsd_to_svr4_sig[sig];
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si->svr4_si_errno = 0;
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si->svr4_si_addr = addr;
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switch (code) {
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case T_PRIVINFLT:
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si->svr4_si_code = SVR4_ILL_PRVOPC;
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si->svr4_si_trap = SVR4_T_PRIVINFLT;
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break;
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case T_BPTFLT:
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si->svr4_si_code = SVR4_TRAP_BRKPT;
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si->svr4_si_trap = SVR4_T_BPTFLT;
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break;
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case T_ARITHTRAP:
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si->svr4_si_code = SVR4_FPE_INTOVF;
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si->svr4_si_trap = SVR4_T_DIVIDE;
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break;
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case T_PROTFLT:
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si->svr4_si_code = SVR4_SEGV_ACCERR;
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si->svr4_si_trap = SVR4_T_PROTFLT;
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break;
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case T_TRCTRAP:
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si->svr4_si_code = SVR4_TRAP_TRACE;
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si->svr4_si_trap = SVR4_T_TRCTRAP;
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break;
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case T_PAGEFLT:
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si->svr4_si_code = SVR4_SEGV_ACCERR;
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si->svr4_si_trap = SVR4_T_PAGEFLT;
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break;
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case T_ALIGNFLT:
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si->svr4_si_code = SVR4_BUS_ADRALN;
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si->svr4_si_trap = SVR4_T_ALIGNFLT;
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break;
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case T_DIVIDE:
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si->svr4_si_code = SVR4_FPE_FLTDIV;
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si->svr4_si_trap = SVR4_T_DIVIDE;
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break;
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case T_OFLOW:
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si->svr4_si_code = SVR4_FPE_FLTOVF;
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si->svr4_si_trap = SVR4_T_DIVIDE;
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break;
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case T_BOUND:
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si->svr4_si_code = SVR4_FPE_FLTSUB;
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si->svr4_si_trap = SVR4_T_BOUND;
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break;
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case T_DNA:
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si->svr4_si_code = SVR4_FPE_FLTINV;
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si->svr4_si_trap = SVR4_T_DNA;
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break;
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case T_FPOPFLT:
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si->svr4_si_code = SVR4_FPE_FLTINV;
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si->svr4_si_trap = SVR4_T_FPOPFLT;
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break;
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case T_SEGNPFLT:
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si->svr4_si_code = SVR4_SEGV_MAPERR;
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si->svr4_si_trap = SVR4_T_SEGNPFLT;
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break;
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case T_STKFLT:
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si->svr4_si_code = SVR4_ILL_BADSTK;
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si->svr4_si_trap = SVR4_T_STKFLT;
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break;
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default:
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si->svr4_si_code = 0;
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si->svr4_si_trap = 0;
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#if defined(DEBUG_SVR4)
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printf("sig %d code %ld\n", sig, code);
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/* panic("svr4_getsiginfo");*/
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#endif
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break;
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}
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}
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/*
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* Send an interrupt to process.
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*
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* Stack is set up to allow sigcode stored
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* in u. to call routine. After the handler is
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* done svr4 will call setcontext for us
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* with the user context we just set up, and we
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* will return to the user pc, psl.
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*/
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void
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svr4_sendsig(catcher, ksi, mask)
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sig_t catcher;
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ksiginfo_t *ksi;
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sigset_t *mask;
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{
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register struct thread *td = curthread;
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struct proc *p = td->td_proc;
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register struct trapframe *tf;
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struct svr4_sigframe *fp, frame;
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struct sigacts *psp;
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int oonstack;
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int sig;
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int code;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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sig = ksi->ksi_signo;
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#if defined(DEBUG_SVR4)
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printf("svr4_sendsig(%d)\n", sig);
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#endif
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code = ksi->ksi_trapno; /* use trap No. */
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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tf = td->td_frame;
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oonstack = sigonstack(tf->tf_esp);
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/*
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* Allocate space for the signal handler context.
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*/
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if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct svr4_sigframe *)(td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(struct svr4_sigframe));
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td->td_sigstk.ss_flags |= SS_ONSTACK;
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} else {
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fp = (struct svr4_sigframe *)tf->tf_esp - 1;
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}
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mtx_unlock(&psp->ps_mtx);
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PROC_UNLOCK(p);
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/*
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* Build the argument list for the signal handler.
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* Notes:
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* - we always build the whole argument list, even when we
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* don't need to [when SA_SIGINFO is not set, we don't need
|
|
* to pass all sf_si and sf_uc]
|
|
* - we don't pass the correct signal address [we need to
|
|
* modify many kernel files to enable that]
|
|
*/
|
|
|
|
svr4_getcontext(td, &frame.sf_uc, mask, oonstack);
|
|
#if defined(DEBUG_SVR4)
|
|
printf("obtained ucontext\n");
|
|
#endif
|
|
svr4_getsiginfo(&frame.sf_si, sig, code, (caddr_t) tf->tf_eip);
|
|
#if defined(DEBUG_SVR4)
|
|
printf("obtained siginfo\n");
|
|
#endif
|
|
frame.sf_signum = frame.sf_si.svr4_si_signo;
|
|
frame.sf_sip = &fp->sf_si;
|
|
frame.sf_ucp = &fp->sf_uc;
|
|
frame.sf_handler = catcher;
|
|
#if defined(DEBUG_SVR4)
|
|
printf("sig = %d, sip %p, ucp = %p, handler = %p\n",
|
|
frame.sf_signum, frame.sf_sip, frame.sf_ucp, frame.sf_handler);
|
|
#endif
|
|
|
|
if (copyout(&frame, fp, sizeof(frame)) != 0) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
/* NOTREACHED */
|
|
}
|
|
#if defined(__NetBSD__)
|
|
/*
|
|
* Build context to run handler in.
|
|
*/
|
|
tf->tf_es = GSEL(GUSERLDT_SEL, SEL_UPL);
|
|
tf->tf_ds = GSEL(GUSERLDT_SEL, SEL_UPL);
|
|
tf->tf_eip = (int)(((char *)PS_STRINGS) -
|
|
svr4_szsigcode);
|
|
tf->tf_cs = GSEL(GUSERLDT_SEL, SEL_UPL);
|
|
|
|
tf->tf_eflags &= ~(PSL_T|PSL_VM|PSL_AC|PSL_D);
|
|
tf->tf_esp = (int)fp;
|
|
tf->tf_ss = GSEL(GUSERLDT_SEL, SEL_UPL);
|
|
#else
|
|
tf->tf_esp = (int)fp;
|
|
tf->tf_eip = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode));
|
|
tf->tf_eflags &= ~(PSL_T | PSL_D);
|
|
tf->tf_cs = _ucodesel;
|
|
tf->tf_ds = _udatasel;
|
|
tf->tf_es = _udatasel;
|
|
tf->tf_fs = _udatasel;
|
|
load_gs(_udatasel);
|
|
tf->tf_ss = _udatasel;
|
|
PROC_LOCK(p);
|
|
mtx_lock(&psp->ps_mtx);
|
|
#endif
|
|
}
|
|
|
|
|
|
|
|
int
|
|
svr4_sys_sysarch(td, v)
|
|
struct thread *td;
|
|
struct svr4_sys_sysarch_args *v;
|
|
{
|
|
struct svr4_sys_sysarch_args *uap = v;
|
|
#if 0 /* USER_LDT */
|
|
#if defined(__NetBSD__)
|
|
caddr_t sg = stackgap_init(p->p_emul);
|
|
#else
|
|
caddr_t sg = stackgap_init();
|
|
#endif
|
|
int error;
|
|
#endif
|
|
|
|
switch (uap->op) {
|
|
case SVR4_SYSARCH_FPHW:
|
|
return 0;
|
|
|
|
case SVR4_SYSARCH_DSCR:
|
|
#if 0 /* USER_LDT */
|
|
#warning "USER_LDT doesn't work - are you sure you want this?"
|
|
{
|
|
struct i386_set_ldt_args sa, *sap;
|
|
struct sys_sysarch_args ua;
|
|
|
|
struct svr4_ssd ssd;
|
|
union descriptor bsd;
|
|
|
|
if ((error = copyin(uap->a1, &ssd,
|
|
sizeof(ssd))) != 0) {
|
|
printf("Cannot copy arg1\n");
|
|
return error;
|
|
}
|
|
|
|
printf("s=%x, b=%x, l=%x, a1=%x a2=%x\n",
|
|
ssd.selector, ssd.base, ssd.limit,
|
|
ssd.access1, ssd.access2);
|
|
|
|
/* We can only set ldt's for now. */
|
|
if (!ISLDT(ssd.selector)) {
|
|
printf("Not an ldt\n");
|
|
return EPERM;
|
|
}
|
|
|
|
/* Oh, well we don't cleanup either */
|
|
if (ssd.access1 == 0)
|
|
return 0;
|
|
|
|
bsd.sd.sd_lobase = ssd.base & 0xffffff;
|
|
bsd.sd.sd_hibase = (ssd.base >> 24) & 0xff;
|
|
|
|
bsd.sd.sd_lolimit = ssd.limit & 0xffff;
|
|
bsd.sd.sd_hilimit = (ssd.limit >> 16) & 0xf;
|
|
|
|
bsd.sd.sd_type = ssd.access1 & 0x1f;
|
|
bsd.sd.sd_dpl = (ssd.access1 >> 5) & 0x3;
|
|
bsd.sd.sd_p = (ssd.access1 >> 7) & 0x1;
|
|
|
|
bsd.sd.sd_xx = ssd.access2 & 0x3;
|
|
bsd.sd.sd_def32 = (ssd.access2 >> 2) & 0x1;
|
|
bsd.sd.sd_gran = (ssd.access2 >> 3)& 0x1;
|
|
|
|
sa.start = IDXSEL(ssd.selector);
|
|
sa.desc = stackgap_alloc(&sg, sizeof(union descriptor));
|
|
sa.num = 1;
|
|
sap = stackgap_alloc(&sg,
|
|
sizeof(struct i386_set_ldt_args));
|
|
|
|
if ((error = copyout(&sa, sap, sizeof(sa))) != 0) {
|
|
printf("Cannot copyout args\n");
|
|
return error;
|
|
}
|
|
|
|
ua.op = I386_SET_LDT;
|
|
ua.parms = (char *) sap;
|
|
|
|
if ((error = copyout(&bsd, sa.desc, sizeof(bsd))) != 0) {
|
|
printf("Cannot copyout desc\n");
|
|
return error;
|
|
}
|
|
|
|
return sys_sysarch(td, &ua, retval);
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
printf("svr4_sysarch(%d), a1 %p\n", uap->op,
|
|
uap->a1);
|
|
return 0;
|
|
}
|
|
}
|