Index: libexec/rtld-elf/aarch64/reloc.c =================================================================== --- /dev/null +++ libexec/rtld-elf/aarch64/reloc.c @@ -0,0 +1,389 @@ +/*- + * Copyright (c) 2008-2010 Rui Paulo + * Copytight (c) 2014 The FreeBSD Foundation + * All rights reserved. + * + * Portions of this software were developed by Andrew Turner + * under sponsorship from the FreeBSD Foundation. + * + * 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 +__FBSDID("$FreeBSD$"); + +#include + +#include + +#include "debug.h" +#include "rtld.h" +#include "rtld_printf.h" + +/* + * It is possible for the compiler to emit relocations for unaligned data. + * We handle this situation with these inlines. + */ +#define RELOC_ALIGNED_P(x) \ + (((uintptr_t)(x) & (sizeof(void *) - 1)) == 0) + +/* + * This is not the correct prototype, but we only need it for + * a function pointer to a simple asm function. + */ +void *_rtld_tlsdesc(void *); + +/* + * Perform early relocation of the run-time linker image + */ +void +reloc_non_plt_self(Elf64_Dyn *dynamic, Elf_Addr relocbase) +{ + unsigned long relent, relcnt; + unsigned long *newaddr; + Elf64_Rela *rel; + Elf64_Dyn *dynp; + + /* + * Find the relocation address, its size and the relocation entry. + */ + relent = 0; + relcnt = 0; + for (dynp = dynamic; dynp->d_tag != DT_NULL; dynp++) { + switch (dynp->d_tag) { + case DT_RELA: + rel = (Elf64_Rela *)((caddr_t)dynp->d_un.d_ptr + + relocbase); + break; + case DT_RELACOUNT: + relcnt = dynp->d_un.d_val; + break; + case DT_RELAENT: + relent = dynp->d_un.d_val; + break; + default: + break; + } + } + + /* + * Perform the actual relocation. + */ + for (; relcnt != 0; relcnt--) { + switch (ELF64_R_TYPE(rel->r_info)) { + case R_AARCH64_RELATIVE: + newaddr = (unsigned long *)(relocbase + rel->r_offset); + *newaddr = relocbase + rel->r_addend; + break; + default: + /* XXX: do we need other relocations ? */ + break; + } + rel = (Elf64_Rela *)((caddr_t)rel + relent); + } +} + +void _exit(int); + +void +init_pltgot(Obj_Entry *obj) +{ + + if (obj->pltgot != NULL) { + obj->pltgot[1] = (Elf_Addr) obj; + obj->pltgot[2] = (Elf_Addr) &_rtld_bind_start; + } +} + +int +do_copy_relocations(Obj_Entry *dstobj) +{ + const Obj_Entry *srcobj, *defobj; + const Elf_Rela *relalim; + const Elf_Rela *rela; + const Elf_Sym *srcsym; + const Elf_Sym *dstsym; + const void *srcaddr; + const char *name; + void *dstaddr; + SymLook req; + size_t size; + int res; + + /* + * COPY relocs are invalid outside of the main program + */ + assert(dstobj->mainprog); + + relalim = (const Elf_Rela *)((char *)dstobj->rela + + dstobj->relasize); + for (rela = dstobj->rela; rela < relalim; rela++) { + if (ELF_R_TYPE(rela->r_info) != R_AARCH64_COPY) + continue; + + dstaddr = (void *)(dstobj->relocbase + rela->r_offset); + dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info); + name = dstobj->strtab + dstsym->st_name; + size = dstsym->st_size; + + symlook_init(&req, name); + req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info)); + req.flags = SYMLOOK_EARLY; + + for (srcobj = dstobj->next; srcobj != NULL; + srcobj = srcobj->next) { + res = symlook_obj(&req, srcobj); + if (res == 0) { + srcsym = req.sym_out; + defobj = req.defobj_out; + break; + } + } + if (srcobj == NULL) { + _rtld_error( +"Undefined symbol \"%s\" referenced from COPY relocation in %s", + name, dstobj->path); + return (-1); + } + + srcaddr = (const void *)(defobj->relocbase + srcsym->st_value); + memcpy(dstaddr, srcaddr, size); + } + + return (0); +} + +/* + * Process the PLT relocations. + */ +int +reloc_plt(Obj_Entry *obj) +{ + RtldLockState lockstate; + const Elf_Rela *relalim; + const Elf_Rela *rela; + const Elf_Sym *def; + const Obj_Entry *defobj; + + relalim = (const Elf_Rela *)((char *)obj->pltrela + obj->pltrelasize); + for (rela = obj->pltrela; rela < relalim; rela++) { + Elf_Addr *where; + + where = (Elf_Addr *)(obj->relocbase + rela->r_offset); + + switch(ELF_R_TYPE(rela->r_info)) { + case R_AARCH64_JUMP_SLOT: + def = find_symdef(ELF_R_SYM(rela->r_info), obj, + &defobj, SYMLOOK_IN_PLT, NULL, &lockstate); + if (def == NULL) { + dbg("reloc_plt: sym not found"); + return (-1); + } + + *where = (Elf_Addr)defobj->relocbase + def->st_value; + break; + case R_AARCH64_TLSDESC: + if (ELF_R_SYM(rela->r_info) == 0) { + where[0] = (Elf_Addr)_rtld_tlsdesc; + where[1] = rela->r_addend; + } else { + _rtld_error("Unable to handle " + "R_AARCH64_TLSDESC with a symbol set"); + } + break; + default: + _rtld_error("Unknown relocation type %u in PLT", + (unsigned int)ELF_R_TYPE(rela->r_info)); + return (-1); + } + } + + return (0); +} + +/* + * LD_BIND_NOW was set - force relocation for all jump slots + */ +int +reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate) +{ + const Obj_Entry *defobj; + const Elf_Rela *relalim; + const Elf_Rela *rela; + const Elf_Sym *def; + + relalim = (const Elf_Rela *)((char *)obj->pltrela + obj->pltrelasize); + for (rela = obj->pltrela; rela < relalim; rela++) { + Elf_Addr *where; + + where = (Elf_Addr *)(obj->relocbase + rela->r_offset); + + switch(ELF_R_TYPE(rela->r_info)) { + case R_AARCH64_JUMP_SLOT: + def = find_symdef(ELF_R_SYM(rela->r_info), obj, + &defobj, SYMLOOK_IN_PLT | flags, NULL, lockstate); + if (def == NULL) { + dbg("reloc_jmpslots: sym not found"); + return (-1); + } + + *where = (Elf_Addr)(defobj->relocbase + def->st_value); + break; + default: + _rtld_error("Unknown relocation type %x in jmpslot", + (unsigned int)ELF_R_TYPE(rela->r_info)); + return (-1); + } + } + + return (0); +} + +int +reloc_iresolve(Obj_Entry *obj, struct Struct_RtldLockState *lockstate) +{ + + /* XXX not implemented */ + return (0); +} + +int +reloc_gnu_ifunc(Obj_Entry *obj, int flags, + struct Struct_RtldLockState *lockstate) +{ + + /* XXX not implemented */ + return (0); +} + +Elf_Addr +reloc_jmpslot(Elf_Addr *where, Elf_Addr target, const Obj_Entry *defobj, + const Obj_Entry *obj, const Elf_Rel *rel) +{ + + assert(ELF_R_TYPE(rel->r_info) == R_ARM_JUMP_SLOT); + + if (*where != target) + *where = target; + + return target; +} + +/* + * Process non-PLT relocations + */ +int +reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags, + RtldLockState *lockstate) +{ + const Obj_Entry *defobj; + const Elf_Rela *relalim; + const Elf_Rela *rela; + const Elf_Sym *def; + SymCache *cache; + Elf_Addr *where; + unsigned long symnum; + + /* The relocation for the dynamic loader has already been done. */ + if (obj == obj_rtld) + return (0); + if ((flags & SYMLOOK_IFUNC) != 0) + /* XXX not implemented */ + return (0); + + /* + * The dynamic loader may be called from a thread, we have + * limited amounts of stack available so we cannot use alloca(). + */ + cache = calloc(obj->dynsymcount, sizeof(SymCache)); + /* No need to check for NULL here */ + + relalim = (const Elf_Rela *)((caddr_t)obj->rela + obj->relasize); + for (rela = obj->rela; rela < relalim; rela++) { + where = (Elf_Addr *)(obj->relocbase + rela->r_offset); + symnum = ELF_R_SYM(rela->r_info); + + switch (ELF_R_TYPE(rela->r_info)) { + case R_AARCH64_ABS64: + case R_AARCH64_GLOB_DAT: + def = find_symdef(symnum, obj, &defobj, flags, cache, + lockstate); + if (def == NULL) + return (-1); + + if (__predict_true(RELOC_ALIGNED_P(where))) { + *where = (Elf_Addr)defobj->relocbase + + def->st_value; + } else { + rtld_printf( + "%s: TODO: Relocate unaligned %p %lu\n", + obj->path, where, ELF_R_TYPE(rela->r_info)); + return (-1); + } + break; + case R_AARCH64_COPY: + if (!obj->mainprog) { + _rtld_error("%s: Unexpected R_AARCH64_COPY " + "relocation in shared library", obj->path); + return (-1); + } + break; + case R_AARCH64_RELATIVE: + if (__predict_true(RELOC_ALIGNED_P(where))) { + *where = (Elf_Addr)(obj->relocbase + + rela->r_addend); + } else { + rtld_printf( + "%s: TODO: Relocate unaligned %p %lu\n", + obj->path, where, ELF_R_TYPE(rela->r_info)); + return (-1); + } + break; + default: + rtld_printf("%s: Unhandled relocation %lu\n", + obj->path, ELF_R_TYPE(rela->r_info)); + return (-1); + break; + } + } + + return (0); +} + +void +allocate_initial_tls(Obj_Entry *objs) +{ + Elf_Addr **tp; + + /* + * Fix the size of the static TLS block by using the maximum + * offset allocated so far and adding a bit for dynamic modules to + * use. + */ + + tls_static_space = tls_last_offset + tls_last_size + + RTLD_STATIC_TLS_EXTRA; + + tp = (Elf_Addr **) allocate_tls(objs, NULL, TLS_TCB_SIZE, 16); + + asm volatile("msr tpidr_el0, %0" : : "r"(tp)); +} Index: libexec/rtld-elf/aarch64/rtld_machdep.h =================================================================== --- /dev/null +++ libexec/rtld-elf/aarch64/rtld_machdep.h @@ -0,0 +1,77 @@ +/*- + * Copyright (c) 1999, 2000 John D. Polstra. + * Copyright (c) 2014 the FreeBSD Foundation + * All rights reserved. + * + * Portions of this software were developed by Andrew Turner + * under sponsorship from the FreeBSD Foundation. + * + * 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. + * + * $FreeBSD$ + */ + +#ifndef RTLD_MACHDEP_H +#define RTLD_MACHDEP_H 1 + +#include +#include + +struct Struct_Obj_Entry; + +/* Return the address of the .dynamic section in the dynamic linker. */ +#define rtld_dynamic(obj) (&_DYNAMIC) + +Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target, + const struct Struct_Obj_Entry *defobj, + const struct Struct_Obj_Entry *obj, + const Elf_Rel *rel); + +#define make_function_pointer(def, defobj) \ + ((defobj)->relocbase + (def)->st_value) + +#define call_initfini_pointer(obj, target) \ + (((InitFunc)(target))()) + +#define call_init_pointer(obj, target) \ + (((InitArrFunc)(target))(main_argc, main_argv, environ)) + +#define round(size, align) \ + (((size) + (align) - 1) & ~((align) - 1)) +#define calculate_first_tls_offset(size, align) \ + round(size, align) +#define calculate_tls_offset(prev_offset, prev_size, size, align) \ + round((prev_offset) + (size), align) +#define calculate_tls_end(off, size) ((off) + (size)) + +#define TLS_TCB_SIZE 8 +typedef struct { + unsigned long ti_module; + unsigned long ti_offset; +} tls_index; + +extern void *__tls_get_addr(tls_index *ti); + +#define RTLD_DEFAULT_STACK_PF_EXEC PF_X +#define RTLD_DEFAULT_STACK_EXEC PROT_EXEC + +#endif Index: libexec/rtld-elf/aarch64/rtld_start.S =================================================================== --- /dev/null +++ libexec/rtld-elf/aarch64/rtld_start.S @@ -0,0 +1,76 @@ +/*- + * Copyright (c) 2014 The FreeBSD Foundation + * All rights reserved. + * + * This software was developed by Andrew Turner under + * sponsorship from the FreeBSD Foundation. + * + * 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 +__FBSDID("$FreeBSD$"); + +ENTRY(.rtld_start) + mov x19, x0 /* Put ps_strings in a callee-saved register */ + mov x20, sp /* And the stack pointer */ + + sub x8, x20, #16 /* Make room for obj_main & exit proc */ + mov sp, x8 /* Update the stack pointer */ + + adr x3, .Ldelta + ldr x2, [x3] + sub x1, x3, x2 /* Load the relocation delta */ + adr x0, _DYNAMIC /* Load &_DYNAMIC */ + bl reloc_non_plt_self + + mov x0, x20 /* Pass the stack we were given to _rtld */ + mov x1, sp /* exit_proc */ + add x2, x1, #8 /* obj_main */ + /* Good */ + bl _rtld /* Call the loader */ + mov x8, x0 /* Backup the entry point */ + + ldr x2, [sp] /* Load cleanup */ + ldr x1, [sp, #8] /* Load obj_main */ + mov x0, x19 /* Restore ps_strings */ + mov sp, x20 /* Restore the stack pointer */ + br x8 /* Jump to the entry point */ +.Ldelta: + .word . + .word 0 +END(.rtld_start) + +/* + * uint64_t _rtld_tlsdesc(struct tlsdesc *); + * + * struct tlsdesc { + * uint64_t ptr; + * uint64_t data; + * }; + * + * Returns the data. + */ +ENTRY(_rtld_tlsdesc) + ldr x0, [x0, #8] + RET +END(_rtld_tlsdesc)