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-rw-r--r--sys/amd64/linux/linux_sysvec.c935
1 files changed, 935 insertions, 0 deletions
diff --git a/sys/amd64/linux/linux_sysvec.c b/sys/amd64/linux/linux_sysvec.c
new file mode 100644
index 000000000000..bb80f324868c
--- /dev/null
+++ b/sys/amd64/linux/linux_sysvec.c
@@ -0,0 +1,935 @@
+/*-
+ * 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("$FreeBSD$");
+
+#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/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/md_var.h>
+#include <machine/pcb.h>
+#include <machine/specialreg.h>
+#include <machine/trap.h>
+
+#include <amd64/linux/linux.h>
+#include <amd64/linux/linux_proto.h>
+#include <compat/linux/linux_emul.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);
+
+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 int linux_copyout_strings(struct image_params *imgp,
+ uintptr_t *stack_base);
+static int linux_fixup_elf(uintptr_t *stack_base,
+ struct image_params *iparams);
+static bool 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);
+static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
+ uintptr_t stack);
+static int linux_vsyscall(struct thread *td);
+
+#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_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
+linux_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 proc *p;
+ struct trapframe *frame;
+ struct syscall_args *sa;
+
+ p = td->td_proc;
+ frame = td->td_frame;
+ sa = &td->td_sa;
+
+ 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;
+ if (error != EJUSTRETURN)
+ 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
+linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
+{
+ Elf_Auxargs *args;
+ Elf_Auxinfo *argarray, *pos;
+ struct proc *p;
+ int error, issetugid;
+
+ p = imgp->proc;
+ args = (Elf64_Auxargs *)imgp->auxargs;
+ argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
+ M_WAITOK | M_ZERO);
+
+ issetugid = p->p_flag & P_SUGID ? 1 : 0;
+ 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, issetugid);
+ AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
+ AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
+ if (imgp->execpathp != 0)
+ AUXARGS_ENTRY_PTR(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;
+ KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
+
+ error = copyout(argarray, (void *)base,
+ sizeof(*argarray) * LINUX_AT_COUNT);
+ free(argarray, M_TEMP);
+ return (error);
+}
+
+static int
+linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
+{
+ Elf_Addr *base;
+
+ base = (Elf64_Addr *)*stack_base;
+ base--;
+ if (suword(base, (uint64_t)imgp->args->argc) == -1)
+ return (EFAULT);
+
+ *stack_base = (uintptr_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 int
+linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
+{
+ int argc, envc, error;
+ char **vectp;
+ char *stringp;
+ uintptr_t destp, ustringp;
+ 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 = (uintptr_t)arginfo;
+
+ if (execpath_len != 0) {
+ destp -= execpath_len;
+ destp = rounddown2(destp, sizeof(void *));
+ imgp->execpathp = (void *)destp;
+ error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
+ if (error != 0)
+ return (error);
+ }
+
+ /* Prepare the canary for SSP. */
+ arc4rand(canary, sizeof(canary), 0);
+ destp -= roundup(sizeof(canary), sizeof(void *));
+ imgp->canary = (void *)destp;
+ error = copyout(canary, imgp->canary, sizeof(canary));
+ if (error != 0)
+ return (error);
+
+ /* Allocate room for the argument and environment strings. */
+ destp -= ARG_MAX - imgp->args->stringspace;
+ destp = rounddown2(destp, sizeof(void *));
+ ustringp = destp;
+
+ if (imgp->auxargs) {
+ /*
+ * Allocate room on the stack for the ELF auxargs
+ * array. It has LINUX_AT_COUNT entries.
+ */
+ destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo);
+ destp = rounddown2(destp, sizeof(void *));
+ }
+
+ vectp = (char **)destp;
+
+ /*
+ * Allocate room for the argv[] and env vectors including the
+ * terminating NULL pointers.
+ */
+ vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
+
+ /*
+ * Starting with 2.24, glibc depends on a 16-byte stack alignment.
+ * One "long argc" will be prepended later.
+ */
+ vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8);
+
+ /* vectp also becomes our initial stack base. */
+ *stack_base = (uintptr_t)vectp;
+
+ stringp = imgp->args->begin_argv;
+ argc = imgp->args->argc;
+ envc = imgp->args->envc;
+
+ /* Copy out strings - arguments and environment. */
+ error = copyout(stringp, (void *)ustringp,
+ ARG_MAX - imgp->args->stringspace);
+ if (error != 0)
+ return (error);
+
+ /* Fill in "ps_strings" struct for ps, w, etc. */
+ if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
+ suword(&arginfo->ps_nargvstr, argc) != 0)
+ return (EFAULT);
+
+ /* Fill in argument portion of vector table. */
+ for (; argc > 0; --argc) {
+ if (suword(vectp++, ustringp) != 0)
+ return (EFAULT);
+ while (*stringp++ != 0)
+ ustringp++;
+ ustringp++;
+ }
+
+ /* A null vector table pointer separates the argp's from the envp's. */
+ if (suword(vectp++, 0) != 0)
+ return (EFAULT);
+
+ if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
+ suword(&arginfo->ps_nenvstr, envc) != 0)
+ return (EFAULT);
+
+ /* Fill in environment portion of vector table. */
+ for (; envc > 0; --envc) {
+ if (suword(vectp++, ustringp) != 0)
+ return (EFAULT);
+ while (*stringp++ != 0)
+ ustringp++;
+ ustringp++;
+ }
+
+ /* The end of the vector table is a null pointer. */
+ if (suword(vectp, 0) != 0)
+ return (EFAULT);
+
+ if (imgp->auxargs) {
+ vectp++;
+ error = imgp->sysent->sv_copyout_auxargs(imgp,
+ (uintptr_t)vectp);
+ if (error != 0)
+ return (error);
+ }
+
+ return (0);
+}
+
+/*
+ * Reset registers to default values on exec.
+ */
+static void
+linux_exec_setregs(struct thread *td, struct image_params *imgp,
+ uintptr_t stack)
+{
+ struct trapframe *regs;
+ struct pcb *pcb;
+ register_t saved_rflags;
+
+ regs = td->td_frame;
+ pcb = td->td_pcb;
+
+ if (td->td_proc->p_md.md_ldt != NULL)
+ user_ldt_free(td);
+
+ 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);
+
+ saved_rflags = regs->tf_rflags & PSL_T;
+ bzero((char *)regs, sizeof(struct trapframe));
+ regs->tf_rip = imgp->entry_addr;
+ regs->tf_rsp = stack;
+ regs->tf_rflags = PSL_USER | saved_rflags;
+ 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 = (caddr_t)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) {
+ 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);
+}
+
+#define LINUX_VSYSCALL_START (-10UL << 20)
+#define LINUX_VSYSCALL_SZ 1024
+
+const unsigned long linux_vsyscall_vector[] = {
+ LINUX_SYS_gettimeofday,
+ LINUX_SYS_linux_time,
+ LINUX_SYS_linux_getcpu,
+};
+
+static int
+linux_vsyscall(struct thread *td)
+{
+ struct trapframe *frame;
+ uint64_t retqaddr;
+ int code, traced;
+ int error;
+
+ frame = td->td_frame;
+
+ /* Check %rip for vsyscall area. */
+ if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START))
+ return (EINVAL);
+ if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0)
+ return (EINVAL);
+ code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ;
+ if (code >= nitems(linux_vsyscall_vector))
+ return (EINVAL);
+
+ /*
+ * vsyscall called as callq *(%rax), so we must
+ * use return address from %rsp and also fixup %rsp.
+ */
+ error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr));
+ if (error)
+ return (error);
+
+ frame->tf_rip = retqaddr;
+ frame->tf_rax = linux_vsyscall_vector[code];
+ frame->tf_rsp += 8;
+
+ traced = (frame->tf_flags & PSL_T);
+
+ amd64_syscall(td, traced);
+
+ return (0);
+}
+
+struct sysentvec elf_linux_sysvec = {
+ .sv_size = LINUX_SYS_MAXSYSCALL,
+ .sv_table = linux_sysent,
+ .sv_errsize = ELAST + 1,
+ .sv_errtbl = linux_errtbl,
+ .sv_transtrap = linux_translate_traps,
+ .sv_fixup = linux_fixup_elf,
+ .sv_sendsig = linux_rt_sendsig,
+ .sv_sigcode = &_binary_linux_locore_o_start,
+ .sv_szsigcode = &linux_szsigcode,
+ .sv_name = "Linux ELF64",
+ .sv_coredump = elf64_coredump,
+ .sv_imgact_try = linux_exec_imgact_try,
+ .sv_minsigstksz = LINUX_MINSIGSTKSZ,
+ .sv_minuser = VM_MIN_ADDRESS,
+ .sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
+ .sv_usrstack = USRSTACK_LA48,
+ .sv_psstrings = PS_STRINGS_LA48,
+ .sv_stackprot = VM_PROT_ALL,
+ .sv_copyout_auxargs = linux_copyout_auxargs,
+ .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_LA48,
+ .sv_shared_page_len = PAGE_SIZE,
+ .sv_schedtail = linux_schedtail,
+ .sv_thread_detach = linux_thread_detach,
+ .sv_trap = linux_vsyscall,
+};
+
+static void
+linux_vdso_install(void *param)
+{
+
+ amd64_lower_shared_page(&elf_linux_sysvec);
+
+ 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);
+
+ 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)elf_linux_sysvec.sv_shared_page_base);
+}
+SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
+ 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,
+ linux_vdso_deinstall, NULL);
+
+static char GNULINUX_ABI_VENDOR[] = "GNU";
+static int GNULINUX_ABI_DESC = 0;
+
+static bool
+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 using the Linux convention of
+ * (version << 16) | (major << 8) | (minor)
+ * See macro in linux_mib.h
+ */
+ *osrel = LINUX_KERNVER(desc[1], desc[2], 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 = linux_emul_path,
+ .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 = linux_emul_path,
+ .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
+};
+
+static Elf64_Brandinfo linux_muslbrand = {
+ .brand = ELFOSABI_LINUX,
+ .machine = EM_X86_64,
+ .compat_3_brand = "Linux",
+ .emul_path = linux_emul_path,
+ .interp_path = "/lib/ld-musl-x86_64.so.1",
+ .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,
+ &linux_muslbrand,
+ 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);
+ 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);
+ 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);
+FEATURE(linux64, "Linux 64bit support");
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 08:22:28 +0000