1129198Scognet/*- 2129198Scognet * Copyright 1996-1998 John D. Polstra. 3129198Scognet * All rights reserved. 4129198Scognet * 5129198Scognet * Redistribution and use in source and binary forms, with or without 6129198Scognet * modification, are permitted provided that the following conditions 7129198Scognet * are met: 8129198Scognet * 1. Redistributions of source code must retain the above copyright 9129198Scognet * notice, this list of conditions and the following disclaimer. 10129198Scognet * 2. Redistributions in binary form must reproduce the above copyright 11129198Scognet * notice, this list of conditions and the following disclaimer in the 12129198Scognet * documentation and/or other materials provided with the distribution. 13129198Scognet * 14129198Scognet * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15129198Scognet * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16129198Scognet * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17129198Scognet * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18129198Scognet * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19129198Scognet * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20129198Scognet * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21129198Scognet * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22129198Scognet * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23129198Scognet * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24129198Scognet */ 25129198Scognet 26129198Scognet#include <sys/cdefs.h> 27129198Scognet__FBSDID("$FreeBSD: stable/11/sys/arm/arm/elf_machdep.c 338867 2018-09-21 20:40:37Z markj $"); 28129198Scognet 29129198Scognet#include <sys/param.h> 30129198Scognet#include <sys/kernel.h> 31129198Scognet#include <sys/systm.h> 32129198Scognet#include <sys/exec.h> 33129198Scognet#include <sys/imgact.h> 34129198Scognet#include <sys/linker.h> 35129198Scognet#include <sys/sysent.h> 36129198Scognet#include <sys/imgact_elf.h> 37208453Skib#include <sys/proc.h> 38129198Scognet#include <sys/syscall.h> 39129198Scognet#include <sys/signalvar.h> 40129198Scognet#include <sys/vnode.h> 41129198Scognet 42129198Scognet#include <vm/vm.h> 43129198Scognet#include <vm/pmap.h> 44129198Scognet#include <vm/vm_param.h> 45129198Scognet 46129198Scognet#include <machine/elf.h> 47129198Scognet#include <machine/md_var.h> 48325837Sjhb#ifdef VFP 49325837Sjhb#include <machine/vfp.h> 50325837Sjhb#endif 51129198Scognet 52270123Simpstatic boolean_t elf32_arm_abi_supported(struct image_params *); 53270123Simp 54325810Sjhbu_long elf_hwcap; 55325810Sjhbu_long elf_hwcap2; 56325810Sjhb 57129198Scognetstruct sysentvec elf32_freebsd_sysvec = { 58183322Skib .sv_size = SYS_MAXSYSCALL, 59183322Skib .sv_table = sysent, 60183322Skib .sv_mask = 0, 61183322Skib .sv_errsize = 0, 62183322Skib .sv_errtbl = NULL, 63183322Skib .sv_transtrap = NULL, 64183322Skib .sv_fixup = __elfN(freebsd_fixup), 65183322Skib .sv_sendsig = sendsig, 66183322Skib .sv_sigcode = sigcode, 67183322Skib .sv_szsigcode = &szsigcode, 68183322Skib .sv_name = "FreeBSD ELF32", 69183322Skib .sv_coredump = __elfN(coredump), 70183322Skib .sv_imgact_try = NULL, 71183322Skib .sv_minsigstksz = MINSIGSTKSZ, 72183322Skib .sv_pagesize = PAGE_SIZE, 73183322Skib .sv_minuser = VM_MIN_ADDRESS, 74183322Skib .sv_maxuser = VM_MAXUSER_ADDRESS, 75183322Skib .sv_usrstack = USRSTACK, 76183322Skib .sv_psstrings = PS_STRINGS, 77183322Skib .sv_stackprot = VM_PROT_ALL, 78183322Skib .sv_copyout_strings = exec_copyout_strings, 79183322Skib .sv_setregs = exec_setregs, 80183322Skib .sv_fixlimit = NULL, 81185169Skib .sv_maxssiz = NULL, 82291937Skib .sv_flags = 83291937Skib#if __ARM_ARCH >= 6 84291937Skib SV_SHP | SV_TIMEKEEP | 85291937Skib#endif 86325810Sjhb SV_ABI_FREEBSD | SV_ILP32 | SV_HWCAP, 87208453Skib .sv_set_syscall_retval = cpu_set_syscall_retval, 88225973Skib .sv_fetch_syscall_args = cpu_fetch_syscall_args, 89208453Skib .sv_syscallnames = syscallnames, 90291937Skib .sv_shared_page_base = SHAREDPAGE, 91291937Skib .sv_shared_page_len = PAGE_SIZE, 92219405Sdchagin .sv_schedtail = NULL, 93283382Sdchagin .sv_thread_detach = NULL, 94293613Sdchagin .sv_trap = NULL, 95325810Sjhb .sv_hwcap = &elf_hwcap, 96325810Sjhb .sv_hwcap2 = &elf_hwcap2, 97129198Scognet}; 98291937SkibINIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 99129198Scognet 100129198Scognetstatic Elf32_Brandinfo freebsd_brand_info = { 101183322Skib .brand = ELFOSABI_FREEBSD, 102183322Skib .machine = EM_ARM, 103183322Skib .compat_3_brand = "FreeBSD", 104183322Skib .emul_path = NULL, 105183322Skib .interp_path = "/libexec/ld-elf.so.1", 106183322Skib .sysvec = &elf32_freebsd_sysvec, 107183322Skib .interp_newpath = NULL, 108189771Sdchagin .brand_note = &elf32_freebsd_brandnote, 109270123Simp .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 110270123Simp .header_supported= elf32_arm_abi_supported, 111183322Skib}; 112129198Scognet 113197729SbzSYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 114129198Scognet (sysinit_cfunc_t) elf32_insert_brand_entry, 115129198Scognet &freebsd_brand_info); 116129198Scognet 117270123Simpstatic boolean_t 118270123Simpelf32_arm_abi_supported(struct image_params *imgp) 119270123Simp{ 120270123Simp const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 121133464Smarcel 122270123Simp /* 123270123Simp * When configured for EABI, FreeBSD supports EABI vesions 4 and 5. 124270123Simp */ 125270123Simp if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) { 126270123Simp if (bootverbose) 127270123Simp uprintf("Attempting to execute non EABI binary (rev %d) image %s", 128270123Simp EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname); 129270123Simp return (FALSE); 130270123Simp } 131270123Simp return (TRUE); 132270123Simp} 133270123Simp 134133464Smarcelvoid 135325837Sjhbelf32_dump_thread(struct thread *td, void *dst, size_t *off) 136133464Smarcel{ 137325837Sjhb#ifdef VFP 138325837Sjhb mcontext_vfp_t vfp; 139325837Sjhb 140325837Sjhb if (dst != NULL) { 141325837Sjhb get_vfpcontext(td, &vfp); 142325837Sjhb *off = elf32_populate_note(NT_ARM_VFP, &vfp, dst, sizeof(vfp), 143325837Sjhb NULL); 144325837Sjhb } else 145325837Sjhb *off = elf32_populate_note(NT_ARM_VFP, NULL, NULL, sizeof(vfp), 146325837Sjhb NULL); 147325837Sjhb#endif 148133464Smarcel} 149133464Smarcel 150338867Smarkjbool 151338867Smarkjelf_is_ifunc_reloc(Elf_Size r_info __unused) 152338867Smarkj{ 153338867Smarkj 154338867Smarkj return (false); 155338867Smarkj} 156338867Smarkj 157269767Simp/* 158269767Simp * It is possible for the compiler to emit relocations for unaligned data. 159269767Simp * We handle this situation with these inlines. 160269767Simp */ 161269767Simp#define RELOC_ALIGNED_P(x) \ 162269767Simp (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0) 163133464Smarcel 164269767Simpstatic __inline Elf_Addr 165269767Simpload_ptr(Elf_Addr *where) 166269767Simp{ 167269767Simp Elf_Addr res; 168269767Simp 169269767Simp if (RELOC_ALIGNED_P(where)) 170269767Simp return *where; 171269767Simp memcpy(&res, where, sizeof(res)); 172269767Simp return (res); 173269767Simp} 174269767Simp 175269767Simpstatic __inline void 176269767Simpstore_ptr(Elf_Addr *where, Elf_Addr val) 177269767Simp{ 178269767Simp if (RELOC_ALIGNED_P(where)) 179269767Simp *where = val; 180269767Simp else 181269767Simp memcpy(where, &val, sizeof(val)); 182269767Simp} 183269767Simp#undef RELOC_ALIGNED_P 184269767Simp 185269767Simp 186129198Scognet/* Process one elf relocation with addend. */ 187129198Scognetstatic int 188129282Speterelf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 189129282Speter int type, int local, elf_lookup_fn lookup) 190129198Scognet{ 191129198Scognet Elf_Addr *where; 192129198Scognet Elf_Addr addr; 193129198Scognet Elf_Addr addend; 194129198Scognet Elf_Word rtype, symidx; 195129198Scognet const Elf_Rel *rel; 196129198Scognet const Elf_Rela *rela; 197288000Skib int error; 198129198Scognet 199129198Scognet switch (type) { 200129198Scognet case ELF_RELOC_REL: 201129198Scognet rel = (const Elf_Rel *)data; 202129198Scognet where = (Elf_Addr *) (relocbase + rel->r_offset); 203269767Simp addend = load_ptr(where); 204129198Scognet rtype = ELF_R_TYPE(rel->r_info); 205129198Scognet symidx = ELF_R_SYM(rel->r_info); 206129198Scognet break; 207129198Scognet case ELF_RELOC_RELA: 208129198Scognet rela = (const Elf_Rela *)data; 209129198Scognet where = (Elf_Addr *) (relocbase + rela->r_offset); 210129198Scognet addend = rela->r_addend; 211129198Scognet rtype = ELF_R_TYPE(rela->r_info); 212129198Scognet symidx = ELF_R_SYM(rela->r_info); 213129198Scognet break; 214129198Scognet default: 215129198Scognet panic("unknown reloc type %d\n", type); 216129198Scognet } 217129198Scognet 218129198Scognet if (local) { 219129198Scognet if (rtype == R_ARM_RELATIVE) { /* A + B */ 220194784Sjeff addr = elf_relocaddr(lf, relocbase + addend); 221269767Simp if (load_ptr(where) != addr) 222269767Simp store_ptr(where, addr); 223129198Scognet } 224129198Scognet return (0); 225129198Scognet } 226129198Scognet 227129198Scognet switch (rtype) { 228129198Scognet 229129198Scognet case R_ARM_NONE: /* none */ 230129198Scognet break; 231129198Scognet 232137211Scognet case R_ARM_ABS32: 233288000Skib error = lookup(lf, symidx, 1, &addr); 234288000Skib if (error != 0) 235129198Scognet return -1; 236269767Simp store_ptr(where, addr + load_ptr(where)); 237129198Scognet break; 238129198Scognet 239129198Scognet case R_ARM_COPY: /* none */ 240129198Scognet /* 241129198Scognet * There shouldn't be copy relocations in kernel 242129198Scognet * objects. 243129198Scognet */ 244129198Scognet printf("kldload: unexpected R_COPY relocation\n"); 245129198Scognet return -1; 246129198Scognet break; 247129198Scognet 248137211Scognet case R_ARM_JUMP_SLOT: 249288000Skib error = lookup(lf, symidx, 1, &addr); 250288000Skib if (error == 0) { 251269767Simp store_ptr(where, addr); 252137211Scognet return (0); 253137211Scognet } 254137211Scognet return (-1); 255129198Scognet case R_ARM_RELATIVE: 256129198Scognet break; 257129198Scognet 258129198Scognet default: 259129198Scognet printf("kldload: unexpected relocation type %d\n", 260129198Scognet rtype); 261129198Scognet return -1; 262129198Scognet } 263129198Scognet return(0); 264129198Scognet} 265129198Scognet 266129198Scognetint 267129282Speterelf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 268129282Speter elf_lookup_fn lookup) 269129198Scognet{ 270129198Scognet 271129282Speter return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 272129198Scognet} 273129198Scognet 274129198Scognetint 275129282Speterelf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 276129282Speter int type, elf_lookup_fn lookup) 277129198Scognet{ 278129198Scognet 279129282Speter return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 280129198Scognet} 281129198Scognet 282129198Scognetint 283294727Sskraelf_cpu_load_file(linker_file_t lf) 284129198Scognet{ 285129198Scognet 286264994Sian /* 287264994Sian * The pmap code does not do an icache sync upon establishing executable 288264994Sian * mappings in the kernel pmap. It's an optimization based on the fact 289264994Sian * that kernel memory allocations always have EXECUTABLE protection even 290264994Sian * when the memory isn't going to hold executable code. The only time 291264994Sian * kernel memory holding instructions does need a sync is after loading 292294727Sskra * a kernel module, and that's when this function gets called. 293294727Sskra * 294294727Sskra * This syncs data and instruction caches after loading a module. We 295294727Sskra * don't worry about the kernel itself (lf->id is 1) as locore.S did 296294727Sskra * that on entry. Even if data cache maintenance was done by IO code, 297294727Sskra * the relocation fixup process creates dirty cache entries that we must 298294727Sskra * write back before doing icache sync. The instruction cache sync also 299294727Sskra * invalidates the branch predictor cache on platforms that have one. 300264994Sian */ 301294727Sskra if (lf->id == 1) 302294727Sskra return (0); 303294727Sskra#if __ARM_ARCH >= 6 304294727Sskra dcache_wb_pou((vm_offset_t)lf->address, (vm_size_t)lf->size); 305294727Sskra icache_inv_all(); 306294727Sskra#else 307294727Sskra cpu_dcache_wb_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 308294727Sskra cpu_l2cache_wb_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 309295207Smmel cpu_icache_sync_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 310294727Sskra#endif 311129198Scognet return (0); 312129198Scognet} 313129198Scognet 314129198Scognetint 315129198Scognetelf_cpu_unload_file(linker_file_t lf __unused) 316129198Scognet{ 317129198Scognet 318129198Scognet return (0); 319129198Scognet} 320