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sys/arm/linux/linux_sysvec.c
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/*- | |||||
* Copyright (c) 1994-1996 Søren Schmidt | |||||
* 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 | |||||
* in this position and unchanged. | |||||
* 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. The name of the author may not be used to endorse or promote products | |||||
* derived from this software without specific prior written permission | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/param.h> | |||||
#include <sys/systm.h> | |||||
#include <sys/exec.h> | |||||
#include <sys/fcntl.h> | |||||
#include <sys/imgact.h> | |||||
#include <sys/imgact_aout.h> | |||||
#include <sys/imgact_elf.h> | |||||
#include <sys/kernel.h> | |||||
#include <sys/lock.h> | |||||
#include <sys/malloc.h> | |||||
#include <sys/module.h> | |||||
#include <sys/mutex.h> | |||||
#include <sys/proc.h> | |||||
#include <sys/signalvar.h> | |||||
#include <sys/syscallsubr.h> | |||||
#include <sys/sysctl.h> | |||||
#include <sys/sysent.h> | |||||
#include <sys/sysproto.h> | |||||
#include <sys/vnode.h> | |||||
#include <sys/eventhandler.h> | |||||
#include <vm/vm.h> | |||||
#include <vm/pmap.h> | |||||
#include <vm/vm_extern.h> | |||||
#include <vm/vm_map.h> | |||||
#include <vm/vm_object.h> | |||||
#include <vm/vm_page.h> | |||||
#include <vm/vm_param.h> | |||||
#include <machine/cpu.h> | |||||
#include <machine/cputypes.h> | |||||
#include <machine/md_var.h> | |||||
#include <machine/pcb.h> | |||||
#include <arm/linux/linux.h> | |||||
#include <arm/linux/linux_proto.h> | |||||
#include <compat/linux/linux_emul.h> | |||||
#include <compat/linux/linux_futex.h> | |||||
#include <compat/linux/linux_ioctl.h> | |||||
#include <compat/linux/linux_mib.h> | |||||
#include <compat/linux/linux_misc.h> | |||||
#include <compat/linux/linux_signal.h> | |||||
#include <compat/linux/linux_util.h> | |||||
#include <compat/linux/linux_vdso.h> | |||||
MODULE_VERSION(linux, 1); | |||||
#if BYTE_ORDER == LITTLE_ENDIAN | |||||
#define SHELLMAGIC 0x2123 /* #! */ | |||||
#else | |||||
#define SHELLMAGIC 0x2321 | |||||
#endif | |||||
#if defined(DEBUG) | |||||
SYSCTL_PROC(_compat_linux, OID_AUTO, debug, | |||||
CTLTYPE_STRING | CTLFLAG_RW, | |||||
0, 0, linux_sysctl_debug, "A", | |||||
"Linux debugging control"); | |||||
#endif | |||||
/* | |||||
* Allow the sendsig functions to use the ldebug() facility | |||||
* even though they are not syscalls themselves. Map them | |||||
* to syscall 0. This is slightly less bogus than using | |||||
* ldebug(sigreturn). | |||||
*/ | |||||
#define LINUX_SYS_linux_rt_sendsig 0 | |||||
#define LINUX_SYS_linux_sendsig 0 | |||||
#define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) | |||||
static int linux_szsigcode; | |||||
static vm_object_t linux_shared_page_obj; | |||||
static char *linux_shared_page_mapping; | |||||
extern char _binary_linux_locore_o_start; | |||||
extern char _binary_linux_locore_o_end; | |||||
extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; | |||||
SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); | |||||
static int linux_fixup(register_t **stack_base, | |||||
struct image_params *iparams); | |||||
static int elf_linux_fixup(register_t **stack_base, | |||||
struct image_params *iparams); | |||||
static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); | |||||
static void exec_linux_setregs(struct thread *td, | |||||
struct image_params *imgp, u_long stack); | |||||
static register_t *linux_copyout_strings(struct image_params *imgp); | |||||
static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); | |||||
static void linux_vdso_install(void *param); | |||||
static void linux_vdso_deinstall(void *param); | |||||
static int linux_szplatform; | |||||
const char *linux_kplatform; | |||||
static eventhandler_tag linux_exit_tag; | |||||
static eventhandler_tag linux_exec_tag; | |||||
static eventhandler_tag linux_thread_dtor_tag; | |||||
/* | |||||
* Linux syscalls return negative errno's, we do positive and map them | |||||
* Reference: | |||||
* FreeBSD: src/sys/sys/errno.h | |||||
* Linux: linux-2.6.17.8/include/asm-generic/errno-base.h | |||||
* linux-2.6.17.8/include/asm-generic/errno.h | |||||
*/ | |||||
static int bsd_to_linux_errno[ELAST + 1] = { | |||||
-0, -1, -2, -3, -4, -5, -6, -7, -8, -9, | |||||
-10, -35, -12, -13, -14, -15, -16, -17, -18, -19, | |||||
-20, -21, -22, -23, -24, -25, -26, -27, -28, -29, | |||||
-30, -31, -32, -33, -34, -11,-115,-114, -88, -89, | |||||
-90, -91, -92, -93, -94, -95, -96, -97, -98, -99, | |||||
-100,-101,-102,-103,-104,-105,-106,-107,-108,-109, | |||||
-110,-111, -40, -36,-112,-113, -39, -11, -87,-122, | |||||
-116, -66, -6, -6, -6, -6, -6, -37, -38, -9, | |||||
-6, -6, -43, -42, -75,-125, -84, -95, -16, -74, | |||||
-72, -67, -71 | |||||
}; | |||||
#define LINUX_T_UNKNOWN 255 | |||||
static int _bsd_to_linux_trapcode[] = { | |||||
LINUX_T_UNKNOWN, /* 0 */ | |||||
6, /* 1 T_PRIVINFLT */ | |||||
LINUX_T_UNKNOWN, /* 2 */ | |||||
3, /* 3 T_BPTFLT */ | |||||
LINUX_T_UNKNOWN, /* 4 */ | |||||
LINUX_T_UNKNOWN, /* 5 */ | |||||
16, /* 6 T_ARITHTRAP */ | |||||
254, /* 7 T_ASTFLT */ | |||||
LINUX_T_UNKNOWN, /* 8 */ | |||||
13, /* 9 T_PROTFLT */ | |||||
1, /* 10 T_TRCTRAP */ | |||||
LINUX_T_UNKNOWN, /* 11 */ | |||||
14, /* 12 T_PAGEFLT */ | |||||
LINUX_T_UNKNOWN, /* 13 */ | |||||
17, /* 14 T_ALIGNFLT */ | |||||
LINUX_T_UNKNOWN, /* 15 */ | |||||
LINUX_T_UNKNOWN, /* 16 */ | |||||
LINUX_T_UNKNOWN, /* 17 */ | |||||
0, /* 18 T_DIVIDE */ | |||||
2, /* 19 T_NMI */ | |||||
4, /* 20 T_OFLOW */ | |||||
5, /* 21 T_BOUND */ | |||||
7, /* 22 T_DNA */ | |||||
8, /* 23 T_DOUBLEFLT */ | |||||
9, /* 24 T_FPOPFLT */ | |||||
10, /* 25 T_TSSFLT */ | |||||
11, /* 26 T_SEGNPFLT */ | |||||
12, /* 27 T_STKFLT */ | |||||
18, /* 28 T_MCHK */ | |||||
19, /* 29 T_XMMFLT */ | |||||
15 /* 30 T_RESERVED */ | |||||
}; | |||||
#define bsd_to_linux_trapcode(code) \ | |||||
((code)<nitems(_bsd_to_linux_trapcode)? \ | |||||
_bsd_to_linux_trapcode[(code)]: \ | |||||
LINUX_T_UNKNOWN) | |||||
LINUX_VDSO_SYM_INTPTR(linux_sigcode); | |||||
LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); | |||||
LINUX_VDSO_SYM_INTPTR(linux_vsyscall); | |||||
/* | |||||
* If FreeBSD & Linux have a difference of opinion about what a trap | |||||
* means, deal with it here. | |||||
* | |||||
* MPSAFE | |||||
*/ | |||||
static int | |||||
translate_traps(int signal, int trap_code) | |||||
{ | |||||
if (signal != SIGBUS) | |||||
return (signal); | |||||
switch (trap_code) { | |||||
case T_PROTFLT: | |||||
case T_TSSFLT: | |||||
case T_DOUBLEFLT: | |||||
case T_PAGEFLT: | |||||
return (SIGSEGV); | |||||
default: | |||||
return (signal); | |||||
} | |||||
} | |||||
static int | |||||
linux_fixup(register_t **stack_base, struct image_params *imgp) | |||||
{ | |||||
register_t *argv, *envp; | |||||
argv = *stack_base; | |||||
envp = *stack_base + (imgp->args->argc + 1); | |||||
(*stack_base)--; | |||||
suword(*stack_base, (intptr_t)(void *)envp); | |||||
(*stack_base)--; | |||||
suword(*stack_base, (intptr_t)(void *)argv); | |||||
(*stack_base)--; | |||||
suword(*stack_base, imgp->args->argc); | |||||
return (0); | |||||
} | |||||
static int | |||||
elf_linux_fixup(register_t **stack_base, struct image_params *imgp) | |||||
{ | |||||
struct proc *p; | |||||
Elf32_Auxargs *args; | |||||
Elf32_Addr *uplatform; | |||||
struct ps_strings *arginfo; | |||||
register_t *pos; | |||||
int issetugid; | |||||
KASSERT(curthread->td_proc == imgp->proc, | |||||
("unsafe elf_linux_fixup(), should be curproc")); | |||||
p = imgp->proc; | |||||
issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; | |||||
arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; | |||||
uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); | |||||
args = (Elf32_Auxargs *)imgp->auxargs; | |||||
pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, | |||||
imgp->proc->p_sysent->sv_shared_page_base); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); | |||||
/* | |||||
* Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, | |||||
* as it has appeared in the 2.4.0-rc7 first time. | |||||
* Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), | |||||
* glibc falls back to the hard-coded CLK_TCK value when aux entry | |||||
* is not present. | |||||
* Also see linux_times() implementation. | |||||
*/ | |||||
if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) | |||||
AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); | |||||
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); | |||||
AUXARGS_ENTRY(pos, AT_PHENT, args->phent); | |||||
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); | |||||
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); | |||||
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); | |||||
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); | |||||
AUXARGS_ENTRY(pos, AT_BASE, args->base); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); | |||||
AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); | |||||
AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); | |||||
AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); | |||||
AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); | |||||
AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); | |||||
if (imgp->execpathp != 0) | |||||
AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); | |||||
if (args->execfd != -1) | |||||
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); | |||||
AUXARGS_ENTRY(pos, AT_NULL, 0); | |||||
free(imgp->auxargs, M_TEMP); | |||||
imgp->auxargs = NULL; | |||||
(*stack_base)--; | |||||
suword(*stack_base, (register_t)imgp->args->argc); | |||||
return (0); | |||||
} | |||||
/* | |||||
* Copied from kern/kern_exec.c | |||||
*/ | |||||
static register_t * | |||||
linux_copyout_strings(struct image_params *imgp) | |||||
{ | |||||
int argc, envc; | |||||
char **vectp; | |||||
char *stringp, *destp; | |||||
register_t *stack_base; | |||||
struct ps_strings *arginfo; | |||||
char canary[LINUX_AT_RANDOM_LEN]; | |||||
size_t execpath_len; | |||||
struct proc *p; | |||||
/* | |||||
* Calculate string base and vector table pointers. | |||||
*/ | |||||
p = imgp->proc; | |||||
if (imgp->execpath != NULL && imgp->auxargs != NULL) | |||||
execpath_len = strlen(imgp->execpath) + 1; | |||||
else | |||||
execpath_len = 0; | |||||
arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; | |||||
destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - | |||||
roundup(sizeof(canary), sizeof(char *)) - | |||||
roundup(execpath_len, sizeof(char *)) - | |||||
roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); | |||||
/* | |||||
* install LINUX_PLATFORM | |||||
*/ | |||||
copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), | |||||
linux_szplatform); | |||||
if (execpath_len != 0) { | |||||
imgp->execpathp = (uintptr_t)arginfo - | |||||
linux_szplatform - execpath_len; | |||||
copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); | |||||
} | |||||
/* | |||||
* Prepare the canary for SSP. | |||||
*/ | |||||
arc4rand(canary, sizeof(canary), 0); | |||||
imgp->canary = (uintptr_t)arginfo - linux_szplatform - | |||||
roundup(execpath_len, sizeof(char *)) - | |||||
roundup(sizeof(canary), sizeof(char *)); | |||||
copyout(canary, (void *)imgp->canary, sizeof(canary)); | |||||
/* | |||||
* If we have a valid auxargs ptr, prepare some room | |||||
* on the stack. | |||||
*/ | |||||
if (imgp->auxargs) { | |||||
/* | |||||
* 'AT_COUNT*2' is size for the ELF Auxargs data. This is for | |||||
* lower compatibility. | |||||
*/ | |||||
imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : | |||||
(LINUX_AT_COUNT * 2); | |||||
/* | |||||
* The '+ 2' is for the null pointers at the end of each of | |||||
* the arg and env vector sets,and imgp->auxarg_size is room | |||||
* for argument of Runtime loader. | |||||
*/ | |||||
vectp = (char **)(destp - (imgp->args->argc + | |||||
imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); | |||||
} else { | |||||
/* | |||||
* The '+ 2' is for the null pointers at the end of each of | |||||
* the arg and env vector sets | |||||
*/ | |||||
vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * | |||||
sizeof(char *)); | |||||
} | |||||
/* | |||||
* vectp also becomes our initial stack base | |||||
*/ | |||||
stack_base = (register_t *)vectp; | |||||
stringp = imgp->args->begin_argv; | |||||
argc = imgp->args->argc; | |||||
envc = imgp->args->envc; | |||||
/* | |||||
* Copy out strings - arguments and environment. | |||||
*/ | |||||
copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); | |||||
/* | |||||
* Fill in "ps_strings" struct for ps, w, etc. | |||||
*/ | |||||
suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); | |||||
suword(&arginfo->ps_nargvstr, argc); | |||||
/* | |||||
* Fill in argument portion of vector table. | |||||
*/ | |||||
for (; argc > 0; --argc) { | |||||
suword(vectp++, (long)(intptr_t)destp); | |||||
while (*stringp++ != 0) | |||||
destp++; | |||||
destp++; | |||||
} | |||||
/* a null vector table pointer separates the argp's from the envp's */ | |||||
suword(vectp++, 0); | |||||
suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); | |||||
suword(&arginfo->ps_nenvstr, envc); | |||||
/* | |||||
* Fill in environment portion of vector table. | |||||
*/ | |||||
for (; envc > 0; --envc) { | |||||
suword(vectp++, (long)(intptr_t)destp); | |||||
while (*stringp++ != 0) | |||||
destp++; | |||||
destp++; | |||||
} | |||||
/* end of vector table is a null pointer */ | |||||
suword(vectp, 0); | |||||
return (stack_base); | |||||
} | |||||
static void | |||||
linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) | |||||
{ | |||||
struct thread *td = curthread; | |||||
struct proc *p = td->td_proc; | |||||
struct sigacts *psp; | |||||
struct trapframe *regs; | |||||
struct l_rt_sigframe *fp, frame; | |||||
int sig, code; | |||||
int oonstack; | |||||
sig = ksi->ksi_signo; | |||||
code = ksi->ksi_code; | |||||
PROC_LOCK_ASSERT(p, MA_OWNED); | |||||
psp = p->p_sigacts; | |||||
mtx_assert(&psp->ps_mtx, MA_OWNED); | |||||
regs = td->td_frame; | |||||
oonstack = sigonstack(regs->tf_esp); | |||||
#ifdef DEBUG | |||||
if (ldebug(rt_sendsig)) | |||||
printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), | |||||
catcher, sig, (void*)mask, code); | |||||
#endif | |||||
/* | |||||
* Allocate space for the signal handler context. | |||||
*/ | |||||
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && | |||||
SIGISMEMBER(psp->ps_sigonstack, sig)) { | |||||
fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + | |||||
td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); | |||||
} else | |||||
fp = (struct l_rt_sigframe *)regs->tf_esp - 1; | |||||
mtx_unlock(&psp->ps_mtx); | |||||
/* | |||||
* Build the argument list for the signal handler. | |||||
*/ | |||||
sig = bsd_to_linux_signal(sig); | |||||
bzero(&frame, sizeof(frame)); | |||||
frame.sf_handler = catcher; | |||||
frame.sf_sig = sig; | |||||
frame.sf_siginfo = &fp->sf_si; | |||||
frame.sf_ucontext = &fp->sf_sc; | |||||
/* Fill in POSIX parts */ | |||||
ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); | |||||
/* | |||||
* Build the signal context to be used by sigreturn. | |||||
*/ | |||||
frame.sf_sc.uc_flags = 0; /* XXX ??? */ | |||||
frame.sf_sc.uc_link = NULL; /* XXX ??? */ | |||||
frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; | |||||
frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; | |||||
frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) | |||||
? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; | |||||
PROC_UNLOCK(p); | |||||
bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); | |||||
frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; | |||||
frame.sf_sc.uc_mcontext.sc_gs = rgs(); | |||||
frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; | |||||
frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; | |||||
frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; | |||||
frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; | |||||
frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; | |||||
frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; | |||||
frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; | |||||
frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; | |||||
frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; | |||||
frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; | |||||
frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; | |||||
frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; | |||||
frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; | |||||
frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; | |||||
frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; | |||||
frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; | |||||
frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; | |||||
frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; | |||||
frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); | |||||
#ifdef DEBUG | |||||
if (ldebug(rt_sendsig)) | |||||
printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), | |||||
frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, | |||||
td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); | |||||
#endif | |||||
if (copyout(&frame, fp, sizeof(frame)) != 0) { | |||||
/* | |||||
* Process has trashed its stack; give it an illegal | |||||
* instruction to halt it in its tracks. | |||||
*/ | |||||
#ifdef DEBUG | |||||
if (ldebug(rt_sendsig)) | |||||
printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), | |||||
fp, oonstack); | |||||
#endif | |||||
PROC_LOCK(p); | |||||
sigexit(td, SIGILL); | |||||
} | |||||
/* | |||||
* Build context to run handler in. | |||||
*/ | |||||
regs->tf_esp = (int)fp; | |||||
regs->tf_eip = linux_rt_sigcode; | |||||
regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); | |||||
regs->tf_cs = _ucodesel; | |||||
regs->tf_ds = _udatasel; | |||||
regs->tf_es = _udatasel; | |||||
regs->tf_fs = _udatasel; | |||||
regs->tf_ss = _udatasel; | |||||
PROC_LOCK(p); | |||||
mtx_lock(&psp->ps_mtx); | |||||
} | |||||
/* | |||||
* 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. | |||||
*/ | |||||
static void | |||||
linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) | |||||
{ | |||||
struct thread *td = curthread; | |||||
struct proc *p = td->td_proc; | |||||
struct sigacts *psp; | |||||
struct trapframe *regs; | |||||
struct l_sigframe *fp, frame; | |||||
l_sigset_t lmask; | |||||
int sig, code; | |||||
int oonstack; | |||||
PROC_LOCK_ASSERT(p, MA_OWNED); | |||||
psp = p->p_sigacts; | |||||
sig = ksi->ksi_signo; | |||||
code = ksi->ksi_code; | |||||
mtx_assert(&psp->ps_mtx, MA_OWNED); | |||||
if (SIGISMEMBER(psp->ps_siginfo, sig)) { | |||||
/* Signal handler installed with SA_SIGINFO. */ | |||||
linux_rt_sendsig(catcher, ksi, mask); | |||||
return; | |||||
} | |||||
regs = td->td_frame; | |||||
oonstack = sigonstack(regs->tf_esp); | |||||
#ifdef DEBUG | |||||
if (ldebug(sendsig)) | |||||
printf(ARGS(sendsig, "%p, %d, %p, %u"), | |||||
catcher, sig, (void*)mask, code); | |||||
#endif | |||||
/* | |||||
* Allocate space for the signal handler context. | |||||
*/ | |||||
if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && | |||||
SIGISMEMBER(psp->ps_sigonstack, sig)) { | |||||
fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + | |||||
td->td_sigstk.ss_size - sizeof(struct l_sigframe)); | |||||
} else | |||||
fp = (struct l_sigframe *)regs->tf_esp - 1; | |||||
mtx_unlock(&psp->ps_mtx); | |||||
PROC_UNLOCK(p); | |||||
/* | |||||
* Build the argument list for the signal handler. | |||||
*/ | |||||
sig = bsd_to_linux_signal(sig); | |||||
bzero(&frame, sizeof(frame)); | |||||
frame.sf_handler = catcher; | |||||
frame.sf_sig = sig; | |||||
bsd_to_linux_sigset(mask, &lmask); | |||||
/* | |||||
* Build the signal context to be used by sigreturn. | |||||
*/ | |||||
frame.sf_sc.sc_mask = lmask.__mask; | |||||
frame.sf_sc.sc_gs = rgs(); | |||||
frame.sf_sc.sc_fs = regs->tf_fs; | |||||
frame.sf_sc.sc_es = regs->tf_es; | |||||
frame.sf_sc.sc_ds = regs->tf_ds; | |||||
frame.sf_sc.sc_edi = regs->tf_edi; | |||||
frame.sf_sc.sc_esi = regs->tf_esi; | |||||
frame.sf_sc.sc_ebp = regs->tf_ebp; | |||||
frame.sf_sc.sc_ebx = regs->tf_ebx; | |||||
frame.sf_sc.sc_esp = regs->tf_esp; | |||||
frame.sf_sc.sc_edx = regs->tf_edx; | |||||
frame.sf_sc.sc_ecx = regs->tf_ecx; | |||||
frame.sf_sc.sc_eax = regs->tf_eax; | |||||
frame.sf_sc.sc_eip = regs->tf_eip; | |||||
frame.sf_sc.sc_cs = regs->tf_cs; | |||||
frame.sf_sc.sc_eflags = regs->tf_eflags; | |||||
frame.sf_sc.sc_esp_at_signal = regs->tf_esp; | |||||
frame.sf_sc.sc_ss = regs->tf_ss; | |||||
frame.sf_sc.sc_err = regs->tf_err; | |||||
frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; | |||||
frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); | |||||
frame.sf_extramask[0] = lmask.__mask; | |||||
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); | |||||
} | |||||
/* | |||||
* Build context to run handler in. | |||||
*/ | |||||
regs->tf_esp = (int)fp; | |||||
regs->tf_eip = linux_sigcode; | |||||
regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); | |||||
regs->tf_cs = _ucodesel; | |||||
regs->tf_ds = _udatasel; | |||||
regs->tf_es = _udatasel; | |||||
regs->tf_fs = _udatasel; | |||||
regs->tf_ss = _udatasel; | |||||
PROC_LOCK(p); | |||||
mtx_lock(&psp->ps_mtx); | |||||
} | |||||
/* | |||||
* 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 | |||||
linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) | |||||
{ | |||||
struct l_sigframe frame; | |||||
struct trapframe *regs; | |||||
l_sigset_t lmask; | |||||
sigset_t bmask; | |||||
int eflags; | |||||
ksiginfo_t ksi; | |||||
regs = td->td_frame; | |||||
#ifdef DEBUG | |||||
if (ldebug(sigreturn)) | |||||
printf(ARGS(sigreturn, "%p"), (void *)args->sfp); | |||||
#endif | |||||
/* | |||||
* The trampoline code hands us the sigframe. | |||||
* It is unsafe to keep track of it ourselves, in the event that a | |||||
* program jumps out of a signal handler. | |||||
*/ | |||||
if (copyin(args->sfp, &frame, sizeof(frame)) != 0) | |||||
return (EFAULT); | |||||
/* | |||||
* Check for security violations. | |||||
*/ | |||||
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) | |||||
eflags = frame.sf_sc.sc_eflags; | |||||
if (!EFLAGS_SECURE(eflags, regs->tf_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. | |||||
*/ | |||||
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) | |||||
if (!CS_SECURE(frame.sf_sc.sc_cs)) { | |||||
ksiginfo_init_trap(&ksi); | |||||
ksi.ksi_signo = SIGBUS; | |||||
ksi.ksi_code = BUS_OBJERR; | |||||
ksi.ksi_trapno = T_PROTFLT; | |||||
ksi.ksi_addr = (void *)regs->tf_eip; | |||||
trapsignal(td, &ksi); | |||||
return (EINVAL); | |||||
} | |||||
lmask.__mask = frame.sf_sc.sc_mask; | |||||
linux_to_bsd_sigset(&lmask, &bmask); | |||||
kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); | |||||
/* | |||||
* Restore signal context. | |||||
*/ | |||||
/* %gs was restored by the trampoline. */ | |||||
regs->tf_fs = frame.sf_sc.sc_fs; | |||||
regs->tf_es = frame.sf_sc.sc_es; | |||||
regs->tf_ds = frame.sf_sc.sc_ds; | |||||
regs->tf_edi = frame.sf_sc.sc_edi; | |||||
regs->tf_esi = frame.sf_sc.sc_esi; | |||||
regs->tf_ebp = frame.sf_sc.sc_ebp; | |||||
regs->tf_ebx = frame.sf_sc.sc_ebx; | |||||
regs->tf_edx = frame.sf_sc.sc_edx; | |||||
regs->tf_ecx = frame.sf_sc.sc_ecx; | |||||
regs->tf_eax = frame.sf_sc.sc_eax; | |||||
regs->tf_eip = frame.sf_sc.sc_eip; | |||||
regs->tf_cs = frame.sf_sc.sc_cs; | |||||
regs->tf_eflags = eflags; | |||||
regs->tf_esp = frame.sf_sc.sc_esp_at_signal; | |||||
regs->tf_ss = frame.sf_sc.sc_ss; | |||||
return (EJUSTRETURN); | |||||
} | |||||
/* | |||||
* System call to cleanup state after a signal | |||||
* has been taken. Reset signal mask and | |||||
* stack state from context left by rt_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 | |||||
linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) | |||||
{ | |||||
struct l_ucontext uc; | |||||
struct l_sigcontext *context; | |||||
sigset_t bmask; | |||||
l_stack_t *lss; | |||||
stack_t ss; | |||||
struct trapframe *regs; | |||||
int eflags; | |||||
ksiginfo_t ksi; | |||||
regs = td->td_frame; | |||||
#ifdef DEBUG | |||||
if (ldebug(rt_sigreturn)) | |||||
printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); | |||||
#endif | |||||
/* | |||||
* The trampoline code hands us the ucontext. | |||||
* It is unsafe to keep track of it ourselves, in the event that a | |||||
* program jumps out of a signal handler. | |||||
*/ | |||||
if (copyin(args->ucp, &uc, sizeof(uc)) != 0) | |||||
return (EFAULT); | |||||
context = &uc.uc_mcontext; | |||||
/* | |||||
* Check for security violations. | |||||
*/ | |||||
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) | |||||
eflags = context->sc_eflags; | |||||
if (!EFLAGS_SECURE(eflags, regs->tf_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. | |||||
*/ | |||||
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) | |||||
if (!CS_SECURE(context->sc_cs)) { | |||||
ksiginfo_init_trap(&ksi); | |||||
ksi.ksi_signo = SIGBUS; | |||||
ksi.ksi_code = BUS_OBJERR; | |||||
ksi.ksi_trapno = T_PROTFLT; | |||||
ksi.ksi_addr = (void *)regs->tf_eip; | |||||
trapsignal(td, &ksi); | |||||
return (EINVAL); | |||||
} | |||||
linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); | |||||
kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); | |||||
/* | |||||
* Restore signal context | |||||
*/ | |||||
/* %gs was restored by the trampoline. */ | |||||
regs->tf_fs = context->sc_fs; | |||||
regs->tf_es = context->sc_es; | |||||
regs->tf_ds = context->sc_ds; | |||||
regs->tf_edi = context->sc_edi; | |||||
regs->tf_esi = context->sc_esi; | |||||
regs->tf_ebp = context->sc_ebp; | |||||
regs->tf_ebx = context->sc_ebx; | |||||
regs->tf_edx = context->sc_edx; | |||||
regs->tf_ecx = context->sc_ecx; | |||||
regs->tf_eax = context->sc_eax; | |||||
regs->tf_eip = context->sc_eip; | |||||
regs->tf_cs = context->sc_cs; | |||||
regs->tf_eflags = eflags; | |||||
regs->tf_esp = context->sc_esp_at_signal; | |||||
regs->tf_ss = context->sc_ss; | |||||
/* | |||||
* call sigaltstack & ignore results.. | |||||
*/ | |||||
lss = &uc.uc_stack; | |||||
ss.ss_sp = lss->ss_sp; | |||||
ss.ss_size = lss->ss_size; | |||||
ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); | |||||
#ifdef DEBUG | |||||
if (ldebug(rt_sigreturn)) | |||||
printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), | |||||
ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); | |||||
#endif | |||||
(void)kern_sigaltstack(td, &ss, NULL); | |||||
return (EJUSTRETURN); | |||||
} | |||||
static int | |||||
linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa) | |||||
{ | |||||
struct proc *p; | |||||
struct trapframe *frame; | |||||
p = td->td_proc; | |||||
frame = td->td_frame; | |||||
sa->code = frame->tf_eax; | |||||
sa->args[0] = frame->tf_ebx; | |||||
sa->args[1] = frame->tf_ecx; | |||||
sa->args[2] = frame->tf_edx; | |||||
sa->args[3] = frame->tf_esi; | |||||
sa->args[4] = frame->tf_edi; | |||||
sa->args[5] = frame->tf_ebp; /* Unconfirmed */ | |||||
if (sa->code >= p->p_sysent->sv_size) | |||||
/* nosys */ | |||||
sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; | |||||
else | |||||
sa->callp = &p->p_sysent->sv_table[sa->code]; | |||||
sa->narg = sa->callp->sy_narg; | |||||
td->td_retval[0] = 0; | |||||
td->td_retval[1] = frame->tf_edx; | |||||
return (0); | |||||
} | |||||
/* | |||||
* If a linux binary is exec'ing something, try this image activator | |||||
* first. We override standard shell script execution in order to | |||||
* be able to modify the interpreter path. We only do this if a linux | |||||
* binary is doing the exec, so we do not create an EXEC module for it. | |||||
*/ | |||||
static int exec_linux_imgact_try(struct image_params *iparams); | |||||
static int | |||||
exec_linux_imgact_try(struct image_params *imgp) | |||||
{ | |||||
const char *head = (const char *)imgp->image_header; | |||||
char *rpath; | |||||
int error = -1; | |||||
/* | |||||
* The interpreter for shell scripts run from a linux binary needs | |||||
* to be located in /compat/linux if possible in order to recursively | |||||
* maintain linux path emulation. | |||||
*/ | |||||
if (((const short *)head)[0] == SHELLMAGIC) { | |||||
/* | |||||
* Run our normal shell image activator. If it succeeds attempt | |||||
* to use the alternate path for the interpreter. If an alternate | |||||
* path is found, use our stringspace to store it. | |||||
*/ | |||||
if ((error = exec_shell_imgact(imgp)) == 0) { | |||||
linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), | |||||
imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); | |||||
if (rpath != NULL) | |||||
imgp->args->fname_buf = | |||||
imgp->interpreter_name = rpath; | |||||
} | |||||
} | |||||
return (error); | |||||
} | |||||
/* | |||||
* exec_setregs may initialize some registers differently than Linux | |||||
* does, thus potentially confusing Linux binaries. If necessary, we | |||||
* override the exec_setregs default(s) here. | |||||
*/ | |||||
static void | |||||
exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) | |||||
{ | |||||
struct pcb *pcb = td->td_pcb; | |||||
exec_setregs(td, imgp, stack); | |||||
/* Linux sets %gs to 0, we default to _udatasel */ | |||||
pcb->pcb_gs = 0; | |||||
load_gs(0); | |||||
pcb->pcb_initial_npxcw = __LINUX_NPXCW__; | |||||
} | |||||
static void | |||||
linux_get_machine(const char **dst) | |||||
{ | |||||
switch (cpu_class) { | |||||
case CPUCLASS_686: | |||||
*dst = "i686"; | |||||
break; | |||||
case CPUCLASS_586: | |||||
*dst = "i586"; | |||||
break; | |||||
case CPUCLASS_486: | |||||
*dst = "i486"; | |||||
break; | |||||
default: | |||||
*dst = "i386"; | |||||
} | |||||
} | |||||
struct sysentvec linux_sysvec = { | |||||
.sv_size = LINUX_SYS_MAXSYSCALL, | |||||
.sv_table = linux_sysent, | |||||
.sv_mask = 0, | |||||
.sv_errsize = ELAST + 1, | |||||
.sv_errtbl = bsd_to_linux_errno, | |||||
.sv_transtrap = translate_traps, | |||||
.sv_fixup = linux_fixup, | |||||
.sv_sendsig = linux_sendsig, | |||||
.sv_sigcode = &_binary_linux_locore_o_start, | |||||
.sv_szsigcode = &linux_szsigcode, | |||||
.sv_name = "Linux a.out", | |||||
.sv_coredump = NULL, | |||||
.sv_imgact_try = exec_linux_imgact_try, | |||||
.sv_minsigstksz = LINUX_MINSIGSTKSZ, | |||||
.sv_pagesize = PAGE_SIZE, | |||||
.sv_minuser = VM_MIN_ADDRESS, | |||||
.sv_maxuser = VM_MAXUSER_ADDRESS, | |||||
.sv_usrstack = LINUX_USRSTACK, | |||||
.sv_psstrings = PS_STRINGS, | |||||
.sv_stackprot = VM_PROT_ALL, | |||||
.sv_copyout_strings = exec_copyout_strings, | |||||
.sv_setregs = exec_linux_setregs, | |||||
.sv_fixlimit = NULL, | |||||
.sv_maxssiz = NULL, | |||||
.sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, | |||||
.sv_set_syscall_retval = cpu_set_syscall_retval, | |||||
.sv_fetch_syscall_args = linux_fetch_syscall_args, | |||||
.sv_syscallnames = NULL, | |||||
.sv_shared_page_base = LINUX_SHAREDPAGE, | |||||
.sv_shared_page_len = PAGE_SIZE, | |||||
.sv_schedtail = linux_schedtail, | |||||
.sv_thread_detach = linux_thread_detach, | |||||
.sv_trap = NULL, | |||||
}; | |||||
INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); | |||||
struct sysentvec elf_linux_sysvec = { | |||||
.sv_size = LINUX_SYS_MAXSYSCALL, | |||||
.sv_table = linux_sysent, | |||||
.sv_mask = 0, | |||||
.sv_errsize = ELAST + 1, | |||||
.sv_errtbl = bsd_to_linux_errno, | |||||
.sv_transtrap = translate_traps, | |||||
.sv_fixup = elf_linux_fixup, | |||||
.sv_sendsig = linux_sendsig, | |||||
.sv_sigcode = &_binary_linux_locore_o_start, | |||||
.sv_szsigcode = &linux_szsigcode, | |||||
.sv_name = "Linux ELF", | |||||
.sv_coredump = elf32_coredump, | |||||
.sv_imgact_try = exec_linux_imgact_try, | |||||
.sv_minsigstksz = LINUX_MINSIGSTKSZ, | |||||
.sv_pagesize = PAGE_SIZE, | |||||
.sv_minuser = VM_MIN_ADDRESS, | |||||
.sv_maxuser = VM_MAXUSER_ADDRESS, | |||||
.sv_usrstack = LINUX_USRSTACK, | |||||
.sv_psstrings = LINUX_PS_STRINGS, | |||||
.sv_stackprot = VM_PROT_ALL, | |||||
.sv_copyout_strings = linux_copyout_strings, | |||||
.sv_setregs = exec_linux_setregs, | |||||
.sv_fixlimit = NULL, | |||||
.sv_maxssiz = NULL, | |||||
.sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, | |||||
.sv_set_syscall_retval = cpu_set_syscall_retval, | |||||
.sv_fetch_syscall_args = linux_fetch_syscall_args, | |||||
.sv_syscallnames = NULL, | |||||
.sv_shared_page_base = LINUX_SHAREDPAGE, | |||||
.sv_shared_page_len = PAGE_SIZE, | |||||
.sv_schedtail = linux_schedtail, | |||||
.sv_thread_detach = linux_thread_detach, | |||||
.sv_trap = NULL, | |||||
}; | |||||
static void | |||||
linux_vdso_install(void *param) | |||||
{ | |||||
linux_szsigcode = (&_binary_linux_locore_o_end - | |||||
&_binary_linux_locore_o_start); | |||||
if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) | |||||
panic("Linux invalid vdso size\n"); | |||||
__elfN(linux_vdso_fixup)(&elf_linux_sysvec); | |||||
linux_shared_page_obj = __elfN(linux_shared_page_init) | |||||
(&linux_shared_page_mapping); | |||||
__elfN(linux_vdso_reloc)(&elf_linux_sysvec, LINUX_SHAREDPAGE); | |||||
bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, | |||||
linux_szsigcode); | |||||
elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; | |||||
} | |||||
SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, | |||||
(sysinit_cfunc_t)linux_vdso_install, NULL); | |||||
static void | |||||
linux_vdso_deinstall(void *param) | |||||
{ | |||||
__elfN(linux_shared_page_fini)(linux_shared_page_obj); | |||||
}; | |||||
SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, | |||||
(sysinit_cfunc_t)linux_vdso_deinstall, NULL); | |||||
static char GNU_ABI_VENDOR[] = "GNU"; | |||||
static int GNULINUX_ABI_DESC = 0; | |||||
static boolean_t | |||||
linux_trans_osrel(const Elf_Note *note, int32_t *osrel) | |||||
{ | |||||
const Elf32_Word *desc; | |||||
uintptr_t p; | |||||
p = (uintptr_t)(note + 1); | |||||
p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); | |||||
desc = (const Elf32_Word *)p; | |||||
if (desc[0] != GNULINUX_ABI_DESC) | |||||
return (FALSE); | |||||
/* | |||||
* For linux we encode osrel as follows (see linux_mib.c): | |||||
* VVVMMMIII (version, major, minor), see linux_mib.c. | |||||
*/ | |||||
*osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; | |||||
return (TRUE); | |||||
} | |||||
static Elf_Brandnote linux_brandnote = { | |||||
.hdr.n_namesz = sizeof(GNU_ABI_VENDOR), | |||||
.hdr.n_descsz = 16, /* XXX at least 16 */ | |||||
.hdr.n_type = 1, | |||||
.vendor = GNU_ABI_VENDOR, | |||||
.flags = BN_TRANSLATE_OSREL, | |||||
.trans_osrel = linux_trans_osrel | |||||
}; | |||||
static Elf32_Brandinfo linux_brand = { | |||||
.brand = ELFOSABI_LINUX, | |||||
.machine = EM_386, | |||||
.compat_3_brand = "Linux", | |||||
.emul_path = "/compat/linux", | |||||
.interp_path = "/lib/ld-linux.so.1", | |||||
.sysvec = &elf_linux_sysvec, | |||||
.interp_newpath = NULL, | |||||
.brand_note = &linux_brandnote, | |||||
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | |||||
}; | |||||
static Elf32_Brandinfo linux_glibc2brand = { | |||||
.brand = ELFOSABI_LINUX, | |||||
.machine = EM_386, | |||||
.compat_3_brand = "Linux", | |||||
.emul_path = "/compat/linux", | |||||
.interp_path = "/lib/ld-linux.so.2", | |||||
.sysvec = &elf_linux_sysvec, | |||||
.interp_newpath = NULL, | |||||
.brand_note = &linux_brandnote, | |||||
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | |||||
}; | |||||
Elf32_Brandinfo *linux_brandlist[] = { | |||||
&linux_brand, | |||||
&linux_glibc2brand, | |||||
NULL | |||||
}; | |||||
static int | |||||
linux_elf_modevent(module_t mod, int type, void *data) | |||||
{ | |||||
Elf32_Brandinfo **brandinfo; | |||||
int error; | |||||
struct linux_ioctl_handler **lihp; | |||||
error = 0; | |||||
switch(type) { | |||||
case MOD_LOAD: | |||||
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; | |||||
++brandinfo) | |||||
if (elf32_insert_brand_entry(*brandinfo) < 0) | |||||
error = EINVAL; | |||||
if (error == 0) { | |||||
SET_FOREACH(lihp, linux_ioctl_handler_set) | |||||
linux_ioctl_register_handler(*lihp); | |||||
LIST_INIT(&futex_list); | |||||
mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); | |||||
linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, | |||||
NULL, 1000); | |||||
linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, | |||||
NULL, 1000); | |||||
linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, | |||||
linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); | |||||
linux_get_machine(&linux_kplatform); | |||||
linux_szplatform = roundup(strlen(linux_kplatform) + 1, | |||||
sizeof(char *)); | |||||
linux_osd_jail_register(); | |||||
stclohz = (stathz ? stathz : hz); | |||||
if (bootverbose) | |||||
printf("Linux ELF exec handler installed\n"); | |||||
} else | |||||
printf("cannot insert Linux ELF brand handler\n"); | |||||
break; | |||||
case MOD_UNLOAD: | |||||
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; | |||||
++brandinfo) | |||||
if (elf32_brand_inuse(*brandinfo)) | |||||
error = EBUSY; | |||||
if (error == 0) { | |||||
for (brandinfo = &linux_brandlist[0]; | |||||
*brandinfo != NULL; ++brandinfo) | |||||
if (elf32_remove_brand_entry(*brandinfo) < 0) | |||||
error = EINVAL; | |||||
} | |||||
if (error == 0) { | |||||
SET_FOREACH(lihp, linux_ioctl_handler_set) | |||||
linux_ioctl_unregister_handler(*lihp); | |||||
mtx_destroy(&futex_mtx); | |||||
EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); | |||||
EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); | |||||
EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); | |||||
linux_osd_jail_deregister(); | |||||
if (bootverbose) | |||||
printf("Linux ELF exec handler removed\n"); | |||||
} else | |||||
printf("Could not deinstall ELF interpreter entry\n"); | |||||
break; | |||||
default: | |||||
return (EOPNOTSUPP); | |||||
} | |||||
return (error); | |||||
} | |||||
static moduledata_t linux_elf_mod = { | |||||
"linuxelf", | |||||
linux_elf_modevent, | |||||
0 | |||||
}; | |||||
DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); | |||||
FEATURE(linux, "Linux 32bit support"); |