elf_machdep.c revision 295207
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: head/sys/arm/arm/elf_machdep.c 295207 2016-02-03 13:47:50Z mmel $"); 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 46291937Skib#include <machine/acle-compat.h> 47129198Scognet#include <machine/elf.h> 48129198Scognet#include <machine/md_var.h> 49129198Scognet 50270123Simpstatic boolean_t elf32_arm_abi_supported(struct image_params *); 51270123Simp 52129198Scognetstruct sysentvec elf32_freebsd_sysvec = { 53183322Skib .sv_size = SYS_MAXSYSCALL, 54183322Skib .sv_table = sysent, 55183322Skib .sv_mask = 0, 56183322Skib .sv_errsize = 0, 57183322Skib .sv_errtbl = NULL, 58183322Skib .sv_transtrap = NULL, 59183322Skib .sv_fixup = __elfN(freebsd_fixup), 60183322Skib .sv_sendsig = sendsig, 61183322Skib .sv_sigcode = sigcode, 62183322Skib .sv_szsigcode = &szsigcode, 63183322Skib .sv_name = "FreeBSD ELF32", 64183322Skib .sv_coredump = __elfN(coredump), 65183322Skib .sv_imgact_try = NULL, 66183322Skib .sv_minsigstksz = MINSIGSTKSZ, 67183322Skib .sv_pagesize = PAGE_SIZE, 68183322Skib .sv_minuser = VM_MIN_ADDRESS, 69183322Skib .sv_maxuser = VM_MAXUSER_ADDRESS, 70183322Skib .sv_usrstack = USRSTACK, 71183322Skib .sv_psstrings = PS_STRINGS, 72183322Skib .sv_stackprot = VM_PROT_ALL, 73183322Skib .sv_copyout_strings = exec_copyout_strings, 74183322Skib .sv_setregs = exec_setregs, 75183322Skib .sv_fixlimit = NULL, 76185169Skib .sv_maxssiz = NULL, 77291937Skib .sv_flags = 78291937Skib#if __ARM_ARCH >= 6 79291937Skib SV_SHP | SV_TIMEKEEP | 80291937Skib#endif 81291937Skib SV_ABI_FREEBSD | SV_ILP32, 82208453Skib .sv_set_syscall_retval = cpu_set_syscall_retval, 83225973Skib .sv_fetch_syscall_args = cpu_fetch_syscall_args, 84208453Skib .sv_syscallnames = syscallnames, 85291937Skib .sv_shared_page_base = SHAREDPAGE, 86291937Skib .sv_shared_page_len = PAGE_SIZE, 87219405Sdchagin .sv_schedtail = NULL, 88283382Sdchagin .sv_thread_detach = NULL, 89293613Sdchagin .sv_trap = NULL, 90129198Scognet}; 91291937SkibINIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec); 92129198Scognet 93129198Scognetstatic Elf32_Brandinfo freebsd_brand_info = { 94183322Skib .brand = ELFOSABI_FREEBSD, 95183322Skib .machine = EM_ARM, 96183322Skib .compat_3_brand = "FreeBSD", 97183322Skib .emul_path = NULL, 98183322Skib .interp_path = "/libexec/ld-elf.so.1", 99183322Skib .sysvec = &elf32_freebsd_sysvec, 100183322Skib .interp_newpath = NULL, 101189771Sdchagin .brand_note = &elf32_freebsd_brandnote, 102270123Simp .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE, 103270123Simp .header_supported= elf32_arm_abi_supported, 104183322Skib}; 105129198Scognet 106197729SbzSYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST, 107129198Scognet (sysinit_cfunc_t) elf32_insert_brand_entry, 108129198Scognet &freebsd_brand_info); 109129198Scognet 110270123Simpstatic boolean_t 111270123Simpelf32_arm_abi_supported(struct image_params *imgp) 112270123Simp{ 113270123Simp const Elf_Ehdr *hdr = (const Elf_Ehdr *)imgp->image_header; 114133464Smarcel 115270123Simp /* 116270123Simp * When configured for EABI, FreeBSD supports EABI vesions 4 and 5. 117270123Simp */ 118270123Simp if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) { 119270123Simp if (bootverbose) 120270123Simp uprintf("Attempting to execute non EABI binary (rev %d) image %s", 121270123Simp EF_ARM_EABI_VERSION(hdr->e_flags), imgp->args->fname); 122270123Simp return (FALSE); 123270123Simp } 124270123Simp return (TRUE); 125270123Simp} 126270123Simp 127133464Smarcelvoid 128133464Smarcelelf32_dump_thread(struct thread *td __unused, void *dst __unused, 129133464Smarcel size_t *off __unused) 130133464Smarcel{ 131133464Smarcel} 132133464Smarcel 133269767Simp/* 134269767Simp * It is possible for the compiler to emit relocations for unaligned data. 135269767Simp * We handle this situation with these inlines. 136269767Simp */ 137269767Simp#define RELOC_ALIGNED_P(x) \ 138269767Simp (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0) 139133464Smarcel 140269767Simpstatic __inline Elf_Addr 141269767Simpload_ptr(Elf_Addr *where) 142269767Simp{ 143269767Simp Elf_Addr res; 144269767Simp 145269767Simp if (RELOC_ALIGNED_P(where)) 146269767Simp return *where; 147269767Simp memcpy(&res, where, sizeof(res)); 148269767Simp return (res); 149269767Simp} 150269767Simp 151269767Simpstatic __inline void 152269767Simpstore_ptr(Elf_Addr *where, Elf_Addr val) 153269767Simp{ 154269767Simp if (RELOC_ALIGNED_P(where)) 155269767Simp *where = val; 156269767Simp else 157269767Simp memcpy(where, &val, sizeof(val)); 158269767Simp} 159269767Simp#undef RELOC_ALIGNED_P 160269767Simp 161269767Simp 162129198Scognet/* Process one elf relocation with addend. */ 163129198Scognetstatic int 164129282Speterelf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data, 165129282Speter int type, int local, elf_lookup_fn lookup) 166129198Scognet{ 167129198Scognet Elf_Addr *where; 168129198Scognet Elf_Addr addr; 169129198Scognet Elf_Addr addend; 170129198Scognet Elf_Word rtype, symidx; 171129198Scognet const Elf_Rel *rel; 172129198Scognet const Elf_Rela *rela; 173288000Skib int error; 174129198Scognet 175129198Scognet switch (type) { 176129198Scognet case ELF_RELOC_REL: 177129198Scognet rel = (const Elf_Rel *)data; 178129198Scognet where = (Elf_Addr *) (relocbase + rel->r_offset); 179269767Simp addend = load_ptr(where); 180129198Scognet rtype = ELF_R_TYPE(rel->r_info); 181129198Scognet symidx = ELF_R_SYM(rel->r_info); 182129198Scognet break; 183129198Scognet case ELF_RELOC_RELA: 184129198Scognet rela = (const Elf_Rela *)data; 185129198Scognet where = (Elf_Addr *) (relocbase + rela->r_offset); 186129198Scognet addend = rela->r_addend; 187129198Scognet rtype = ELF_R_TYPE(rela->r_info); 188129198Scognet symidx = ELF_R_SYM(rela->r_info); 189129198Scognet break; 190129198Scognet default: 191129198Scognet panic("unknown reloc type %d\n", type); 192129198Scognet } 193129198Scognet 194129198Scognet if (local) { 195129198Scognet if (rtype == R_ARM_RELATIVE) { /* A + B */ 196194784Sjeff addr = elf_relocaddr(lf, relocbase + addend); 197269767Simp if (load_ptr(where) != addr) 198269767Simp store_ptr(where, addr); 199129198Scognet } 200129198Scognet return (0); 201129198Scognet } 202129198Scognet 203129198Scognet switch (rtype) { 204129198Scognet 205129198Scognet case R_ARM_NONE: /* none */ 206129198Scognet break; 207129198Scognet 208137211Scognet case R_ARM_ABS32: 209288000Skib error = lookup(lf, symidx, 1, &addr); 210288000Skib if (error != 0) 211129198Scognet return -1; 212269767Simp store_ptr(where, addr + load_ptr(where)); 213129198Scognet break; 214129198Scognet 215129198Scognet case R_ARM_COPY: /* none */ 216129198Scognet /* 217129198Scognet * There shouldn't be copy relocations in kernel 218129198Scognet * objects. 219129198Scognet */ 220129198Scognet printf("kldload: unexpected R_COPY relocation\n"); 221129198Scognet return -1; 222129198Scognet break; 223129198Scognet 224137211Scognet case R_ARM_JUMP_SLOT: 225288000Skib error = lookup(lf, symidx, 1, &addr); 226288000Skib if (error == 0) { 227269767Simp store_ptr(where, addr); 228137211Scognet return (0); 229137211Scognet } 230137211Scognet return (-1); 231129198Scognet case R_ARM_RELATIVE: 232129198Scognet break; 233129198Scognet 234129198Scognet default: 235129198Scognet printf("kldload: unexpected relocation type %d\n", 236129198Scognet rtype); 237129198Scognet return -1; 238129198Scognet } 239129198Scognet return(0); 240129198Scognet} 241129198Scognet 242129198Scognetint 243129282Speterelf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type, 244129282Speter elf_lookup_fn lookup) 245129198Scognet{ 246129198Scognet 247129282Speter return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup)); 248129198Scognet} 249129198Scognet 250129198Scognetint 251129282Speterelf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data, 252129282Speter int type, elf_lookup_fn lookup) 253129198Scognet{ 254129198Scognet 255129282Speter return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup)); 256129198Scognet} 257129198Scognet 258129198Scognetint 259294727Sskraelf_cpu_load_file(linker_file_t lf) 260129198Scognet{ 261129198Scognet 262264994Sian /* 263264994Sian * The pmap code does not do an icache sync upon establishing executable 264264994Sian * mappings in the kernel pmap. It's an optimization based on the fact 265264994Sian * that kernel memory allocations always have EXECUTABLE protection even 266264994Sian * when the memory isn't going to hold executable code. The only time 267264994Sian * kernel memory holding instructions does need a sync is after loading 268294727Sskra * a kernel module, and that's when this function gets called. 269294727Sskra * 270294727Sskra * This syncs data and instruction caches after loading a module. We 271294727Sskra * don't worry about the kernel itself (lf->id is 1) as locore.S did 272294727Sskra * that on entry. Even if data cache maintenance was done by IO code, 273294727Sskra * the relocation fixup process creates dirty cache entries that we must 274294727Sskra * write back before doing icache sync. The instruction cache sync also 275294727Sskra * invalidates the branch predictor cache on platforms that have one. 276264994Sian */ 277294727Sskra if (lf->id == 1) 278294727Sskra return (0); 279294727Sskra#if __ARM_ARCH >= 6 280294727Sskra dcache_wb_pou((vm_offset_t)lf->address, (vm_size_t)lf->size); 281294727Sskra icache_inv_all(); 282294727Sskra#else 283294727Sskra cpu_dcache_wb_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 284294727Sskra cpu_l2cache_wb_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 285295207Smmel cpu_icache_sync_range((vm_offset_t)lf->address, (vm_size_t)lf->size); 286294727Sskra#endif 287129198Scognet return (0); 288129198Scognet} 289129198Scognet 290129198Scognetint 291129198Scognetelf_cpu_unload_file(linker_file_t lf __unused) 292129198Scognet{ 293129198Scognet 294129198Scognet return (0); 295129198Scognet} 296