1 /*- 2 * Copyright (c) 2014, 2015 The FreeBSD Foundation. 3 * Copyright (c) 2014, 2017 Andrew Turner. 4 * Copyright (c) 2018 Olivier Houchard 5 * All rights reserved. 6 * 7 * This software was developed by Andrew Turner under 8 * sponsorship from the FreeBSD Foundation. 9 * 10 * Portions of this software were developed by Konstantin Belousov 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #define __ELF_WORD_SIZE 32 39 40 #include <sys/param.h> 41 #include <sys/kernel.h> 42 #include <sys/systm.h> 43 #include <sys/exec.h> 44 #include <sys/imgact.h> 45 #include <sys/linker.h> 46 #include <sys/proc.h> 47 #include <sys/reg.h> 48 #include <sys/sysent.h> 49 #include <sys/imgact_elf.h> 50 #include <sys/syscall.h> 51 #include <sys/signalvar.h> 52 #include <sys/vnode.h> 53 54 #include <machine/elf.h> 55 #include <machine/pcb.h> 56 #ifdef VFP 57 #include <machine/vfp.h> 58 #endif 59 60 #include <compat/freebsd32/freebsd32_util.h> 61 62 #define FREEBSD32_MINUSER 0x00001000 63 #define FREEBSD32_MAXUSER ((1ul << 32) - PAGE_SIZE) 64 #define FREEBSD32_SHAREDPAGE (FREEBSD32_MAXUSER - PAGE_SIZE) 65 #define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE 66 67 extern const char *freebsd32_syscallnames[]; 68 69 extern char aarch32_sigcode[]; 70 extern int sz_aarch32_sigcode; 71 72 static int freebsd32_fetch_syscall_args(struct thread *td); 73 static void freebsd32_setregs(struct thread *td, struct image_params *imgp, 74 u_long stack); 75 static void freebsd32_set_syscall_retval(struct thread *, int); 76 77 static boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *, 78 uint32_t *); 79 80 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 81 82 u_long __read_frequently elf32_hwcap; 83 u_long __read_frequently elf32_hwcap2; 84 85 static struct sysentvec elf32_freebsd_sysvec = { 86 .sv_size = SYS_MAXSYSCALL, 87 .sv_table = freebsd32_sysent, 88 .sv_fixup = elf32_freebsd_fixup, 89 .sv_sendsig = freebsd32_sendsig, 90 .sv_sigcode = aarch32_sigcode, 91 .sv_szsigcode = &sz_aarch32_sigcode, 92 .sv_name = "FreeBSD ELF32", 93 .sv_coredump = elf32_coredump, 94 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 95 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 96 .sv_elf_core_prepare_notes = elf32_prepare_notes, 97 .sv_imgact_try = NULL, 98 .sv_minsigstksz = MINSIGSTKSZ, 99 .sv_minuser = FREEBSD32_MINUSER, 100 .sv_maxuser = FREEBSD32_MAXUSER, 101 .sv_usrstack = FREEBSD32_USRSTACK, 102 .sv_psstrings = FREEBSD32_PS_STRINGS, 103 .sv_psstringssz = sizeof(struct freebsd32_ps_strings), 104 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 105 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs, 106 .sv_copyout_strings = freebsd32_copyout_strings, 107 .sv_setregs = freebsd32_setregs, 108 .sv_fixlimit = NULL, // XXX 109 .sv_maxssiz = NULL, 110 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_TIMEKEEP | 111 SV_RNG_SEED_VER, 112 .sv_set_syscall_retval = freebsd32_set_syscall_retval, 113 .sv_fetch_syscall_args = freebsd32_fetch_syscall_args, 114 .sv_syscallnames = freebsd32_syscallnames, 115 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 116 .sv_shared_page_len = PAGE_SIZE, 117 .sv_schedtail = NULL, 118 .sv_thread_detach = NULL, 119 .sv_trap = NULL, 120 .sv_hwcap = &elf32_hwcap, 121 .sv_hwcap2 = &elf32_hwcap2, 122 .sv_onexec_old = exec_onexec_old, 123 .sv_onexit = exit_onexit, 124 .sv_regset_begin = SET_BEGIN(__elfN(regset)), 125 .sv_regset_end = SET_LIMIT(__elfN(regset)), 126 }; 127 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 128 129 static Elf32_Brandinfo freebsd32_brand_info = { 130 .brand = ELFOSABI_FREEBSD, 131 .machine = EM_ARM, 132 .compat_3_brand = "FreeBSD", 133 .emul_path = NULL, 134 .interp_path = "/libexec/ld-elf.so.1", 135 .sysvec = &elf32_freebsd_sysvec, 136 .interp_newpath = "/libexec/ld-elf32.so.1", 137 .brand_note = &elf32_freebsd_brandnote, 138 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 139 .header_supported= elf32_arm_abi_supported, 140 }; 141 142 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 143 (sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info); 144 145 static boolean_t 146 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused, 147 uint32_t *fctl0 __unused) 148 { 149 const Elf32_Ehdr *hdr; 150 151 /* Check if we support AArch32 */ 152 if (ID_AA64PFR0_EL0_VAL(READ_SPECIALREG(id_aa64pfr0_el1)) != 153 ID_AA64PFR0_EL0_64_32) 154 return (FALSE); 155 156 #define EF_ARM_EABI_FREEBSD_MIN EF_ARM_EABI_VER4 157 hdr = (const Elf32_Ehdr *)imgp->image_header; 158 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) { 159 if (bootverbose) 160 uprintf("Attempting to execute non EABI binary " 161 "(rev %d) image %s", 162 EF_ARM_EABI_VERSION(hdr->e_flags), 163 imgp->args->fname); 164 return (FALSE); 165 } 166 167 return (TRUE); 168 } 169 170 static int 171 freebsd32_fetch_syscall_args(struct thread *td) 172 { 173 struct proc *p; 174 register_t *ap; 175 struct syscall_args *sa; 176 int error, i, nap, narg; 177 unsigned int args[4]; 178 179 nap = 4; 180 p = td->td_proc; 181 ap = td->td_frame->tf_x; 182 sa = &td->td_sa; 183 184 /* r7 is the syscall id */ 185 sa->code = td->td_frame->tf_x[7]; 186 sa->original_code = sa->code; 187 188 if (sa->code == SYS_syscall) { 189 sa->code = *ap++; 190 nap--; 191 } else if (sa->code == SYS___syscall) { 192 sa->code = ap[1]; 193 nap -= 2; 194 ap += 2; 195 } 196 197 if (sa->code >= p->p_sysent->sv_size) 198 sa->callp = &p->p_sysent->sv_table[0]; 199 else 200 sa->callp = &p->p_sysent->sv_table[sa->code]; 201 202 narg = sa->callp->sy_narg; 203 for (i = 0; i < nap; i++) 204 sa->args[i] = ap[i]; 205 if (narg > nap) { 206 if (narg - nap > nitems(args)) 207 panic("Too many system call arguiments"); 208 error = copyin((void *)td->td_frame->tf_x[13], args, 209 (narg - nap) * sizeof(int)); 210 if (error != 0) 211 return (error); 212 for (i = 0; i < (narg - nap); i++) 213 sa->args[i + nap] = args[i]; 214 } 215 216 td->td_retval[0] = 0; 217 td->td_retval[1] = 0; 218 219 return (0); 220 } 221 222 static void 223 freebsd32_set_syscall_retval(struct thread *td, int error) 224 { 225 struct trapframe *frame; 226 227 frame = td->td_frame; 228 switch (error) { 229 case 0: 230 frame->tf_x[0] = td->td_retval[0]; 231 frame->tf_x[1] = td->td_retval[1]; 232 frame->tf_spsr &= ~PSR_C; 233 break; 234 case ERESTART: 235 /* 236 * Reconstruct the pc to point at the swi. 237 */ 238 if ((frame->tf_spsr & PSR_T) != 0) 239 frame->tf_elr -= 2; //THUMB_INSN_SIZE; 240 else 241 frame->tf_elr -= 4; //INSN_SIZE; 242 break; 243 case EJUSTRETURN: 244 /* nothing to do */ 245 break; 246 default: 247 frame->tf_x[0] = error; 248 frame->tf_spsr |= PSR_C; 249 break; 250 } 251 } 252 253 static void 254 freebsd32_setregs(struct thread *td, struct image_params *imgp, 255 uintptr_t stack) 256 { 257 struct trapframe *tf = td->td_frame; 258 struct pcb *pcb = td->td_pcb; 259 260 memset(tf, 0, sizeof(struct trapframe)); 261 262 /* 263 * We need to set x0 for init as it doesn't call 264 * cpu_set_syscall_retval to copy the value. We also 265 * need to set td_retval for the cases where we do. 266 */ 267 tf->tf_x[0] = stack; 268 /* SP_usr is mapped to x13 */ 269 tf->tf_x[13] = stack; 270 /* LR_usr is mapped to x14 */ 271 tf->tf_x[14] = imgp->entry_addr; 272 tf->tf_elr = imgp->entry_addr; 273 tf->tf_spsr = PSR_M_32; 274 if ((uint32_t)imgp->entry_addr & 1) 275 tf->tf_spsr |= PSR_T; 276 277 #ifdef VFP 278 vfp_reset_state(td, pcb); 279 #endif 280 281 /* 282 * Clear debug register state. It is not applicable to the new process. 283 */ 284 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs)); 285 } 286 287 void 288 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 289 { 290 } 291