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-rw-r--r--sys/amd64/linux/linux_sysvec.c946
1 files changed, 946 insertions, 0 deletions
diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
new file mode 100644
index 0000000..37c1b69
--- /dev/null
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -0,0 +1,946 @@
+/*-
+ * Copyright (c) 2013 Dmitry Chagin
+ * Copyright (c) 2004 Tim J. Robbins
+ * Copyright (c) 2003 Peter Wemm
+ * Copyright (c) 2002 Doug Rabson
+ * Copyright (c) 1998-1999 Andrew Gallatin
+ * 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 "opt_compat.h"
+
+#define __ELF_WORD_SIZE 64
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/exec.h>
+#include <sys/fcntl.h>
+#include <sys/imgact.h>
+#include <sys/imgact_elf.h>
+#include <sys/kernel.h>
+#include <sys/ktr.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/signalvar.h>
+#include <sys/sysctl.h>
+#include <sys/syscallsubr.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/md_var.h>
+#include <machine/pcb.h>
+#include <machine/specialreg.h>
+
+#include <amd64/linux/linux.h>
+#include <amd64/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_sysproto.h>
+#include <compat/linux/linux_util.h>
+#include <compat/linux/linux_vdso.h>
+
+MODULE_VERSION(linux64, 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 64 debugging control");
+#endif
+
+/*
+ * Allow the this 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
+
+const char *linux_kplatform;
+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 register_t * linux_copyout_strings(struct image_params *imgp);
+static int elf_linux_fixup(register_t **stack_base,
+ struct image_params *iparams);
+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 void linux_set_syscall_retval(struct thread *td, int error);
+static int linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa);
+static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
+ u_long stack);
+
+/*
+ * 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)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
+ _bsd_to_linux_trapcode[(code)]: \
+ LINUX_T_UNKNOWN)
+
+LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
+LINUX_VDSO_SYM_CHAR(linux_platform);
+
+/*
+ * 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_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->args[0] = frame->tf_rdi;
+ sa->args[1] = frame->tf_rsi;
+ sa->args[2] = frame->tf_rdx;
+ sa->args[3] = frame->tf_rcx;
+ sa->args[4] = frame->tf_r8;
+ sa->args[5] = frame->tf_r9;
+ sa->code = frame->tf_rax;
+
+ 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;
+ return (0);
+}
+
+static void
+linux_set_syscall_retval(struct thread *td, int error)
+{
+ struct trapframe *frame = td->td_frame;
+
+ /*
+ * On Linux only %rcx and %r11 values are not preserved across
+ * the syscall.
+ * So, do not clobber %rdx and %r10
+ */
+ td->td_retval[1] = frame->tf_rdx;
+ frame->tf_r10 = frame->tf_rcx;
+
+ cpu_set_syscall_retval(td, error);
+
+ /* Restore all registers. */
+ set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
+}
+
+static int
+elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
+{
+ Elf_Auxargs *args;
+ Elf_Addr *base;
+ Elf_Addr *pos;
+ struct ps_strings *arginfo;
+ struct proc *p;
+
+ p = imgp->proc;
+ arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
+
+ KASSERT(curthread->td_proc == imgp->proc,
+ ("unsafe elf_linux_fixup(), should be curproc"));
+ base = (Elf64_Addr *)*stack_base;
+ args = (Elf64_Auxargs *)imgp->auxargs;
+ pos = 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_HWCAP, cpu_feature);
+ 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_BASE, args->base);
+ AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
+ AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
+ 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_SECURE, 0);
+ AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
+ 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;
+
+ base--;
+ suword(base, (uint64_t)imgp->args->argc);
+
+ *stack_base = (register_t *)base;
+ return (0);
+}
+
+/*
+ * Copy strings out to the new process address space, constructing new arg
+ * and env vector tables. Return a pointer to the base so that it can be used
+ * as the initial stack pointer.
+ */
+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.
+ */
+ if (imgp->execpath != NULL && imgp->auxargs != NULL)
+ execpath_len = strlen(imgp->execpath) + 1;
+ else
+ execpath_len = 0;
+
+ p = imgp->proc;
+ arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
+ destp = (caddr_t)arginfo - SPARE_USRSPACE -
+ roundup(sizeof(canary), sizeof(char *)) -
+ roundup(execpath_len, sizeof(char *)) -
+ roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
+
+ if (execpath_len != 0) {
+ imgp->execpathp = (uintptr_t)arginfo - 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 -
+ 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);
+}
+
+/*
+ * Reset registers to default values on exec.
+ */
+static void
+linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
+{
+ struct trapframe *regs = td->td_frame;
+ struct pcb *pcb = td->td_pcb;
+
+ mtx_lock(&dt_lock);
+ if (td->td_proc->p_md.md_ldt != NULL)
+ user_ldt_free(td);
+ else
+ mtx_unlock(&dt_lock);
+
+ pcb->pcb_fsbase = 0;
+ pcb->pcb_gsbase = 0;
+ clear_pcb_flags(pcb, PCB_32BIT);
+ pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
+ set_pcb_flags(pcb, PCB_FULL_IRET);
+
+ bzero((char *)regs, sizeof(struct trapframe));
+ regs->tf_rip = imgp->entry_addr;
+ regs->tf_rsp = stack;
+ regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
+ regs->tf_ss = _udatasel;
+ regs->tf_cs = _ucodesel;
+ regs->tf_ds = _udatasel;
+ regs->tf_es = _udatasel;
+ regs->tf_fs = _ufssel;
+ regs->tf_gs = _ugssel;
+ regs->tf_flags = TF_HASSEGS;
+
+ /*
+ * Reset the hardware debug registers if they were in use.
+ * They won't have any meaning for the newly exec'd process.
+ */
+ if (pcb->pcb_flags & PCB_DBREGS) {
+ pcb->pcb_dr0 = 0;
+ pcb->pcb_dr1 = 0;
+ pcb->pcb_dr2 = 0;
+ pcb->pcb_dr3 = 0;
+ pcb->pcb_dr6 = 0;
+ pcb->pcb_dr7 = 0;
+ if (pcb == curpcb) {
+ /*
+ * Clear the debug registers on the running
+ * CPU, otherwise they will end up affecting
+ * the next process we switch to.
+ */
+ reset_dbregs();
+ }
+ clear_pcb_flags(pcb, PCB_DBREGS);
+ }
+
+ /*
+ * Drop the FP state if we hold it, so that the process gets a
+ * clean FP state if it uses the FPU again.
+ */
+ fpstate_drop(td);
+}
+
+/*
+ * Copied from amd64/amd64/machdep.c
+ *
+ * XXX fpu state need? don't think so
+ */
+int
+linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
+{
+ struct proc *p;
+ struct l_ucontext uc;
+ struct l_sigcontext *context;
+ struct trapframe *regs;
+ unsigned long rflags;
+ int error;
+ ksiginfo_t ksi;
+
+ regs = td->td_frame;
+ error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc));
+ if (error != 0)
+ return (error);
+
+ p = td->td_proc;
+ context = &uc.uc_mcontext;
+ rflags = context->sc_rflags;
+
+ /*
+ * Don't allow users to change privileged or reserved flags.
+ */
+ /*
+ * XXX do allow users to change the privileged flag PSL_RF.
+ * The cpu sets PSL_RF in tf_rflags for faults. Debuggers
+ * should sometimes set it there too. tf_rflags is kept in
+ * the signal context during signal handling and there is no
+ * other place to remember it, so the PSL_RF bit may be
+ * corrupted by the signal handler without us knowing.
+ * Corruption of the PSL_RF bit at worst causes one more or
+ * one less debugger trap, so allowing it is fairly harmless.
+ */
+
+#define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
+ if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
+ printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags);
+ 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)) {
+ printf("linux_rt_sigreturn: cs = 0x%x\n", 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_rip;
+ trapsignal(td, &ksi);
+ return (EINVAL);
+ }
+
+ PROC_LOCK(p);
+ linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
+ SIG_CANTMASK(td->td_sigmask);
+ signotify(td);
+ PROC_UNLOCK(p);
+
+ regs->tf_rdi = context->sc_rdi;
+ regs->tf_rsi = context->sc_rsi;
+ regs->tf_rdx = context->sc_rdx;
+ regs->tf_rbp = context->sc_rbp;
+ regs->tf_rbx = context->sc_rbx;
+ regs->tf_rcx = context->sc_rcx;
+ regs->tf_rax = context->sc_rax;
+ regs->tf_rip = context->sc_rip;
+ regs->tf_rsp = context->sc_rsp;
+ regs->tf_r8 = context->sc_r8;
+ regs->tf_r9 = context->sc_r9;
+ regs->tf_r10 = context->sc_r10;
+ regs->tf_r11 = context->sc_r11;
+ regs->tf_r12 = context->sc_r12;
+ regs->tf_r13 = context->sc_r13;
+ regs->tf_r14 = context->sc_r14;
+ regs->tf_r15 = context->sc_r15;
+ regs->tf_cs = context->sc_cs;
+ regs->tf_err = context->sc_err;
+ regs->tf_rflags = rflags;
+
+ set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
+ return (EJUSTRETURN);
+}
+
+/*
+ * copied from amd64/amd64/machdep.c
+ *
+ * Send an interrupt to process.
+ */
+static void
+linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
+{
+ struct l_rt_sigframe sf, *sfp;
+ struct proc *p;
+ struct thread *td;
+ struct sigacts *psp;
+ caddr_t sp;
+ struct trapframe *regs;
+ int sig, code;
+ int oonstack;
+
+ td = curthread;
+ p = td->td_proc;
+ PROC_LOCK_ASSERT(p, MA_OWNED);
+ sig = ksi->ksi_signo;
+ psp = p->p_sigacts;
+ code = ksi->ksi_code;
+ mtx_assert(&psp->ps_mtx, MA_OWNED);
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_rsp);
+
+ LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u",
+ catcher, sig, mask, code);
+
+ /* Allocate space for the signal handler context. */
+ if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ sp = td->td_sigstk.ss_sp + td->td_sigstk.ss_size -
+ sizeof(struct l_rt_sigframe);
+ } else
+ sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128;
+ /* Align to 16 bytes. */
+ sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul);
+ mtx_unlock(&psp->ps_mtx);
+
+ /* Translate the signal. */
+ sig = bsd_to_linux_signal(sig);
+
+ /* Save user context. */
+ bzero(&sf, sizeof(sf));
+ bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask);
+ bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask);
+
+ sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
+ sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
+ sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
+ ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
+ PROC_UNLOCK(p);
+
+ sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi;
+ sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi;
+ sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx;
+ sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp;
+ sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx;
+ sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx;
+ sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax;
+ sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip;
+ sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp;
+ sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8;
+ sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9;
+ sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10;
+ sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11;
+ sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12;
+ sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13;
+ sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14;
+ sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15;
+ sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
+ sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags;
+ sf.sf_sc.uc_mcontext.sc_err = regs->tf_err;
+ sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
+ sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
+
+ /* Build the argument list for the signal handler. */
+ regs->tf_rdi = sig; /* arg 1 in %rdi */
+ regs->tf_rax = 0;
+ regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */
+ regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */
+
+ sf.sf_handler = catcher;
+ /* Fill in POSIX parts */
+ ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig);
+
+ /*
+ * Copy the sigframe out to the user's stack.
+ */
+ if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
+#ifdef DEBUG
+ printf("process %ld has trashed its stack\n", (long)p->p_pid);
+#endif
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ regs->tf_rsp = (long)sfp;
+ regs->tf_rip = linux_rt_sigcode;
+ regs->tf_rflags &= ~(PSL_T | PSL_D);
+ regs->tf_cs = _ucodesel;
+ set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
+ PROC_LOCK(p);
+ mtx_lock(&psp->ps_mtx);
+}
+
+/*
+ * 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, len;
+
+ /*
+ * 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) {
+ len = strlen(rpath) + 1;
+
+ if (len <= MAXSHELLCMDLEN)
+ memcpy(imgp->interpreter_name,
+ rpath, len);
+ free(rpath, M_TEMP);
+ }
+ }
+ }
+ return(error);
+}
+
+struct sysentvec elf_linux_sysvec = {
+ .sv_size = LINUX_SYS_MAXSYSCALL,
+ .sv_table = linux_sysent,
+ .sv_mask = 0,
+ .sv_sigsize = 0,
+ .sv_sigtbl = NULL,
+ .sv_errsize = ELAST + 1,
+ .sv_errtbl = bsd_to_linux_errno,
+ .sv_transtrap = translate_traps,
+ .sv_fixup = elf_linux_fixup,
+ .sv_sendsig = linux_rt_sendsig,
+ .sv_sigcode = &_binary_linux_locore_o_start,
+ .sv_szsigcode = &linux_szsigcode,
+ .sv_prepsyscall = NULL,
+ .sv_name = "Linux ELF64",
+ .sv_coredump = elf64_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 = USRSTACK,
+ .sv_psstrings = PS_STRINGS,
+ .sv_stackprot = VM_PROT_ALL,
+ .sv_copyout_strings = linux_copyout_strings,
+ .sv_setregs = linux_exec_setregs,
+ .sv_fixlimit = NULL,
+ .sv_maxssiz = NULL,
+ .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
+ .sv_set_syscall_retval = linux_set_syscall_retval,
+ .sv_fetch_syscall_args = linux_fetch_syscall_args,
+ .sv_syscallnames = NULL,
+ .sv_shared_page_base = SHAREDPAGE,
+ .sv_shared_page_len = PAGE_SIZE,
+ .sv_schedtail = linux_schedtail,
+ .sv_thread_detach = linux_thread_detach
+};
+
+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, SHAREDPAGE);
+
+ bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
+ linux_szsigcode);
+ elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
+
+ linux_kplatform = linux_shared_page_mapping +
+ (linux_platform - (caddr_t)SHAREDPAGE);
+}
+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 GNULINUX_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 linux64_brandnote = {
+ .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR),
+ .hdr.n_descsz = 16,
+ .hdr.n_type = 1,
+ .vendor = GNULINUX_ABI_VENDOR,
+ .flags = BN_TRANSLATE_OSREL,
+ .trans_osrel = linux_trans_osrel
+};
+
+static Elf64_Brandinfo linux_glibc2brand = {
+ .brand = ELFOSABI_LINUX,
+ .machine = EM_X86_64,
+ .compat_3_brand = "Linux",
+ .emul_path = "/compat/linux",
+ .interp_path = "/lib64/ld-linux-x86-64.so.2",
+ .sysvec = &elf_linux_sysvec,
+ .interp_newpath = NULL,
+ .brand_note = &linux64_brandnote,
+ .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
+};
+
+static Elf64_Brandinfo linux_glibc2brandshort = {
+ .brand = ELFOSABI_LINUX,
+ .machine = EM_X86_64,
+ .compat_3_brand = "Linux",
+ .emul_path = "/compat/linux",
+ .interp_path = "/lib64/ld-linux.so.2",
+ .sysvec = &elf_linux_sysvec,
+ .interp_newpath = NULL,
+ .brand_note = &linux64_brandnote,
+ .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
+};
+
+Elf64_Brandinfo *linux_brandlist[] = {
+ &linux_glibc2brand,
+ &linux_glibc2brandshort,
+ NULL
+};
+
+static int
+linux64_elf_modevent(module_t mod, int type, void *data)
+{
+ Elf64_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 (elf64_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, "ftllk64", NULL, MTX_DEF);
+ stclohz = (stathz ? stathz : hz);
+ if (bootverbose)
+ printf("Linux x86-64 ELF exec handler installed\n");
+ } else
+ printf("cannot insert Linux x86-64 ELF brand handler\n");
+ break;
+ case MOD_UNLOAD:
+ for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
+ ++brandinfo)
+ if (elf64_brand_inuse(*brandinfo))
+ error = EBUSY;
+ if (error == 0) {
+ for (brandinfo = &linux_brandlist[0];
+ *brandinfo != NULL; ++brandinfo)
+ if (elf64_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);
+ 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 linux64_elf_mod = {
+ "linux64elf",
+ linux64_elf_modevent,
+ 0
+};
+
+DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
+MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
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