FreeBSD/Linux Kernel Cross Reference
sys/ia64/ia32/ia32_signal.c

     /*-
      * Copyright (c) 2002 Doug Rabson
      * 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 AUTHOR 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 AUTHOR 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"
    
    #define __ELF_WORD_SIZE 32
    
    #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 <sys/imgact_elf.h>
    #include <sys/sysproto.h>
    
    #include <machine/frame.h>
    #include <machine/md_var.h>
    #include <machine/pcb.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_signal.h>
    #include <compat/freebsd32/freebsd32_util.h>
    #include <compat/freebsd32/freebsd32_proto.h>
    #include <compat/ia32/ia32_signal.h>
    #include <i386/include/psl.h>
    #include <i386/include/segments.h>
    #include <i386/include/specialreg.h>
    
    char ia32_sigcode[] = {
            0xff, 0x54, 0x24, 0x10,         /* call *SIGF_HANDLER(%esp) */
            0x8d, 0x44, 0x24, 0x14,         /* lea SIGF_UC(%esp),%eax */
            0x50,                           /* pushl %eax */
            0xf7, 0x40, 0x54, 0x00, 0x00, 0x02, 0x02, /* testl $PSL_VM,UC_EFLAGS(%ea
    x) */
            0x75, 0x03,                     /* jne 9f */
            0x8e, 0x68, 0x14,               /* movl UC_GS(%eax),%gs */
            0xb8, 0x57, 0x01, 0x00, 0x00,   /* 9: movl $SYS_sigreturn,%eax */
            0x50,                           /* pushl %eax */
            0xcd, 0x80,                     /* int $0x80 */
            0xeb, 0xfe,                     /* 0: jmp 0b */
            0
    };
    int sz_ia32_sigcode = sizeof(ia32_sigcode);
    
    /*
     * Signal sending has not been implemented on ia64.  This causes
     * the sigtramp code to not understand the arguments and the application
     * will generally crash if it tries to handle a signal.  Calling
     * sendsig() means that at least untrapped signals will work.
    */
   void
   ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
   {
           sendsig(catcher, ksi, mask);
   }
   
   #ifdef COMPAT_FREEBSD4
   int
   freebsd4_freebsd32_sigreturn(struct thread *td, struct freebsd4_freebsd32_sigreturn_args *uap)
   {
           return (sigreturn(td, (struct sigreturn_args *)uap));
   }
   #endif
   
   int
   freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
   {
           return (sigreturn(td, (struct sigreturn_args *)uap));
   }
   
   
   void
   ia32_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings)
   {
           struct trapframe *tf = td->td_frame;
           vm_offset_t gdt, ldt;
           u_int64_t codesel, datasel, ldtsel;
           u_int64_t codeseg, dataseg, gdtseg, ldtseg;
           struct segment_descriptor desc;
           struct vmspace *vmspace = td->td_proc->p_vmspace;
   
           exec_setregs(td, entry, stack, ps_strings);
   
           /* Non-syscall frames are cleared by exec_setregs() */
           if (tf->tf_flags & FRAME_SYSCALL) {
                   bzero(&tf->tf_scratch, sizeof(tf->tf_scratch));
                   bzero(&tf->tf_scratch_fp, sizeof(tf->tf_scratch_fp));
           } else
                   tf->tf_special.ndirty = 0;
   
           tf->tf_special.psr |= IA64_PSR_IS;
           tf->tf_special.sp = stack;
   
           /* Point the RSE backstore to something harmless. */
           tf->tf_special.bspstore = (FREEBSD32_PS_STRINGS - sz_ia32_sigcode -
               SPARE_USRSPACE + 15) & ~15;
   
           codesel = LSEL(LUCODE_SEL, SEL_UPL);
           datasel = LSEL(LUDATA_SEL, SEL_UPL);
           ldtsel = GSEL(GLDT_SEL, SEL_UPL);
   
           /* Setup ia32 segment registers. */
           tf->tf_scratch.gr16 = (datasel << 48) | (datasel << 32) |
               (datasel << 16) | datasel;
           tf->tf_scratch.gr17 = (ldtsel << 32) | (datasel << 16) | codesel;
   
           /*
            * Build the GDT and LDT.
            */
           gdt = FREEBSD32_USRSTACK;
           vm_map_find(&vmspace->vm_map, 0, 0, &gdt, IA32_PAGE_SIZE << 1, 0,
               VM_PROT_ALL, VM_PROT_ALL, 0);
           ldt = gdt + IA32_PAGE_SIZE;
   
           desc.sd_lolimit = 8*NLDT-1;
           desc.sd_lobase = ldt & 0xffffff;
           desc.sd_type = SDT_SYSLDT;
           desc.sd_dpl = SEL_UPL;
           desc.sd_p = 1;
           desc.sd_hilimit = 0;
           desc.sd_def32 = 0;
           desc.sd_gran = 0;
           desc.sd_hibase = ldt >> 24;
           copyout(&desc, (caddr_t) gdt + 8*GLDT_SEL, sizeof(desc));
   
           desc.sd_lolimit = ((FREEBSD32_USRSTACK >> 12) - 1) & 0xffff;
           desc.sd_lobase = 0;
           desc.sd_type = SDT_MEMERA;
           desc.sd_dpl = SEL_UPL;
           desc.sd_p = 1;
           desc.sd_hilimit = ((FREEBSD32_USRSTACK >> 12) - 1) >> 16;
           desc.sd_def32 = 1;
           desc.sd_gran = 1;
           desc.sd_hibase = 0;
           copyout(&desc, (caddr_t) ldt + 8*LUCODE_SEL, sizeof(desc));
           desc.sd_type = SDT_MEMRWA;
           copyout(&desc, (caddr_t) ldt + 8*LUDATA_SEL, sizeof(desc));
   
           codeseg = 0             /* base */
                   + (((FREEBSD32_USRSTACK >> 12) - 1) << 32) /* limit */
                   + ((long)SDT_MEMERA << 52)
                   + ((long)SEL_UPL << 57)
                   + (1L << 59) /* present */
                   + (1L << 62) /* 32 bits */
                   + (1L << 63); /* page granularity */
           dataseg = 0             /* base */
                   + (((FREEBSD32_USRSTACK >> 12) - 1) << 32) /* limit */
                   + ((long)SDT_MEMRWA << 52)
                   + ((long)SEL_UPL << 57)
                   + (1L << 59) /* present */
                   + (1L << 62) /* 32 bits */
                   + (1L << 63); /* page granularity */
   
           tf->tf_scratch.csd = codeseg;
           tf->tf_scratch.ssd = dataseg;
           tf->tf_scratch.gr24 = dataseg; /* ESD */
           tf->tf_scratch.gr27 = dataseg; /* DSD */
           tf->tf_scratch.gr28 = dataseg; /* FSD */
           tf->tf_scratch.gr29 = dataseg; /* GSD */
   
           gdtseg = gdt            /* base */
                   + ((8L*NGDT - 1) << 32) /* limit */
                   + ((long)SDT_SYSNULL << 52)
                   + ((long)SEL_UPL << 57)
                   + (1L << 59) /* present */
                   + (0L << 62) /* 16 bits */
                   + (0L << 63); /* byte granularity */
           ldtseg = ldt            /* base */
                   + ((8L*NLDT - 1) << 32) /* limit */
                   + ((long)SDT_SYSLDT << 52)
                   + ((long)SEL_UPL << 57)
                   + (1L << 59) /* present */
                   + (0L << 62) /* 16 bits */
                   + (0L << 63); /* byte granularity */
   
           tf->tf_scratch.gr30 = ldtseg; /* LDTD */
           tf->tf_scratch.gr31 = gdtseg; /* GDTD */
   
           /* Set ia32 control registers on this processor. */
           ia64_set_cflg(CR0_PE | CR0_PG | ((long)(CR4_XMM | CR4_FXSR) << 32));
           ia64_set_eflag(PSL_USER);
   
           /* PS_STRINGS value for BSD/OS binaries.  It is 0 for non-BSD/OS. */
           tf->tf_scratch.gr11 = FREEBSD32_PS_STRINGS;
   
           /*
            * XXX - Linux emulator
            * Make sure sure edx is 0x0 on entry. Linux binaries depend
            * on it.
            */
           td->td_retval[1] = 0;
   }
   
   void
   ia32_restorectx(struct pcb *pcb)
   {
   
           ia64_set_cflg(pcb->pcb_ia32_cflg);
           ia64_set_eflag(pcb->pcb_ia32_eflag);
           ia64_set_fcr(pcb->pcb_ia32_fcr);
           ia64_set_fdr(pcb->pcb_ia32_fdr);
           ia64_set_fir(pcb->pcb_ia32_fir);
           ia64_set_fsr(pcb->pcb_ia32_fsr);
   }
   
   void
   ia32_savectx(struct pcb *pcb)
   {
   
           pcb->pcb_ia32_cflg = ia64_get_cflg();
           pcb->pcb_ia32_eflag = ia64_get_eflag();
           pcb->pcb_ia32_fcr = ia64_get_fcr();
           pcb->pcb_ia32_fdr = ia64_get_fdr();
           pcb->pcb_ia32_fir = ia64_get_fir();
           pcb->pcb_ia32_fsr = ia64_get_fsr();
   }
   
   int
   freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
   {
   
           return (nosys(td, NULL));
   }
   
   int
   freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
   {
   
           return (nosys(td, NULL));
   }
   
   int
   freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
   {
   
           return (nosys(td, NULL));
   }

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