diff options
Diffstat (limited to 'sys/arm64/linux/linux_sysvec.c')
| -rw-r--r-- | sys/arm64/linux/linux_sysvec.c | 566 |
1 files changed, 566 insertions, 0 deletions
diff --git a/sys/arm64/linux/linux_sysvec.c b/sys/arm64/linux/linux_sysvec.c new file mode 100644 index 000000000000..5b33b63fba92 --- /dev/null +++ b/sys/arm64/linux/linux_sysvec.c @@ -0,0 +1,566 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause-FreeBSD + * + * Copyright (c) 1994-1996 Søren Schmidt + * Copyright (c) 2018 Turing Robotic Industries Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/cdefs.h> +#include <sys/elf.h> +#include <sys/exec.h> +#include <sys/imgact.h> +#include <sys/imgact_elf.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/signalvar.h> +#include <sys/sysctl.h> +#include <sys/sysent.h> + +#include <vm/vm_param.h> + +#include <arm64/linux/linux.h> +#include <arm64/linux/linux_proto.h> +#include <compat/linux/linux_dtrace.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_util.h> +#include <compat/linux/linux_vdso.h> + +MODULE_VERSION(linux64elf, 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_elf_fixup(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(const void *param); +static void linux_vdso_deinstall(const 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); + +/* DTrace init */ +LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); + +/* DTrace probes */ +LIN_SDT_PROBE_DEFINE2(sysvec, linux_translate_traps, todo, "int", "int"); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_vsyscall, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo); +LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo); + +/* LINUXTODO: do we have traps to translate? */ +static int +linux_translate_traps(int signal, int trap_code) +{ + + LIN_SDT_PROBE2(sysvec, linux_translate_traps, todo, signal, trap_code); + return (signal); +} + +LINUX_VDSO_SYM_CHAR(linux_platform); + +static int +linux_fetch_syscall_args(struct thread *td) +{ + struct proc *p; + struct syscall_args *sa; + register_t *ap; + + p = td->td_proc; + ap = td->td_frame->tf_x; + sa = &td->td_sa; + + sa->code = td->td_frame->tf_x[8]; + /* LINUXTODO: generic syscall? */ + if (sa->code >= p->p_sysent->sv_size) + sa->callp = &p->p_sysent->sv_table[0]; + else + sa->callp = &p->p_sysent->sv_table[sa->code]; + + sa->narg = sa->callp->sy_narg; + if (sa->narg > 8) + panic("ARM64TODO: Could we have more than 8 args?"); + memcpy(sa->args, ap, 8 * sizeof(register_t)); + + td->td_retval[0] = 0; + return (0); +} + +static void +linux_set_syscall_retval(struct thread *td, int error) +{ + + td->td_retval[1] = td->td_frame->tf_x[1]; + cpu_set_syscall_retval(td, error); +} + +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; + + LIN_SDT_PROBE0(sysvec, linux_copyout_auxargs, todo); + 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); +#if 0 /* LINUXTODO: implement arm64 LINUX_AT_HWCAP */ + AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); +#endif + 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); +#if 0 /* LINUXTODO: implement arm64 LINUX_AT_PLATFORM */ + AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); +#endif + 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_elf_fixup(uintptr_t *stack_base, struct image_params *imgp) +{ + + LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo); + + 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. + * LINUXTODO: deduplicate against other linuxulator archs + */ +static int +linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) +{ + 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; + int argc, envc, error; + + /* 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 up to LINUX_AT_COUNT entries. + */ + destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo); + destp = rounddown2(destp, sizeof(void *)); + } + + vectp = (char **)destp; + + /* + * Allocate room for argc and the argv[] and env vectors including the + * terminating NULL pointers. + */ + vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1; + vectp = (char **)STACKALIGN(vectp); + + /* 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); + + if (suword(vectp++, 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 = td->td_frame; + + /* LINUXTODO: validate */ + LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo); + + memset(regs, 0, sizeof(*regs)); + /* glibc start.S registers function pointer in x0 with atexit. */ + regs->tf_sp = stack; +#if 0 /* LINUXTODO: See if this is used. */ + regs->tf_lr = imgp->entry_addr; +#else + regs->tf_lr = 0xffffffffffffffff; +#endif + regs->tf_elr = imgp->entry_addr; +} + +int +linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) +{ + + /* LINUXTODO: implement */ + LIN_SDT_PROBE0(sysvec, linux_rt_sigreturn, todo); + return (EDOOFUS); +} + +static void +linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) +{ + + /* LINUXTODO: implement */ + LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo); +} + +static int +linux_vsyscall(struct thread *td) +{ + + /* LINUXTODO: implement */ + LIN_SDT_PROBE0(sysvec, linux_vsyscall, todo); + return (EDOOFUS); +} + +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_elf_fixup, + .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, + .sv_usrstack = USRSTACK, + .sv_psstrings = PS_STRINGS, /* XXX */ + .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, + .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, + .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(const 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("invalid Linux 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); + + memcpy(linux_shared_page_mapping, elf_linux_sysvec.sv_sigcode, + linux_szsigcode); + elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; + + printf("LINUXTODO: %s: fix linux_kplatform\n", __func__); +#if 0 + linux_kplatform = linux_shared_page_mapping + + (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); +#else + linux_kplatform = "arm64"; +#endif +} +SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, + linux_vdso_install, NULL); + +static void +linux_vdso_deinstall(const void *param) +{ + + LIN_SDT_PROBE0(sysvec, linux_vdso_deinstall, todo); + __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 GNU_ABI_VENDOR[] = "GNU"; +static int GNU_ABI_LINUX = 0; + +/* LINUXTODO: deduplicate */ +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] != GNU_ABI_LINUX) + return (false); + + *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); + return (true); +} + +static Elf_Brandnote linux64_brandnote = { + .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), + .hdr.n_descsz = 16, + .hdr.n_type = 1, + .vendor = GNU_ABI_VENDOR, + .flags = BN_TRANSLATE_OSREL, + .trans_osrel = linux_trans_osrel +}; + +static Elf64_Brandinfo linux_glibc2brand = { + .brand = ELFOSABI_LINUX, + .machine = EM_AARCH64, + .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 +}; + +Elf64_Brandinfo *linux_brandlist[] = { + &linux_glibc2brand, + NULL +}; + +static int +linux64_elf_modevent(module_t mod, int type, void *data) +{ + Elf64_Brandinfo **brandinfo; + struct linux_ioctl_handler**lihp; + int error; + + 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 arm64 ELF exec handler installed\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, "AArch64 Linux 64bit support"); |