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freebsd-skq/sys/ia64/ia32/ia32_signal.c
kib 7c2eaa21fe Add support for executing the FreeBSD 1/i386 a.out binaries on amd64. 
In particular:
- implement compat shims for old stat(2) variants and ogetdirentries(2);
- implement delivery of signals with ancient stack frame layout and
  corresponding sigreturn(2);
- implement old getpagesize(2);
- provide a user-mode trampoline and LDT call gate for lcall $7,$0;
- port a.out image activator and connect it to the build as a module
  on amd64.

The changes are hidden under COMPAT_43.

MFC after:   1 month
2011-04-01 11:16:29 +00:00

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/*-
* 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);
#ifdef COMPAT_43
int
ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
{
return (EOPNOTSUPP);
}
#endif
/*
* 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, struct image_params *imgp, u_long stack)
{
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;
struct sysentvec *sv;
sv = td->td_proc->p_sysent;
exec_setregs(td, imgp, stack);
/* 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 = (sv->sv_psstrings - 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 = sv->sv_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 = ((sv->sv_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 = ((sv->sv_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 */
+ (((sv->sv_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 */
+ (((sv->sv_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 = td->td_proc->p_sysent->sv_psstrings;
/*
* 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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