svn commit: r280903 - in head/libexec/rtld-elf: . aarch64
Andrew Turner
andrew at FreeBSD.org
Tue Mar 31 09:51:22 UTC 2015
Author: andrew
Date: Tue Mar 31 09:51:19 2015
New Revision: 280903
URL: https://svnweb.freebsd.org/changeset/base/280903
Log:
Add the arm64 code to the runtime linker. It's not able to be built as we
still need libc_pic for a few things, but this is expected to be ready
soon.
Differential Revision: https://reviews.freebsd.org/D2136
Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Added:
head/libexec/rtld-elf/aarch64/
head/libexec/rtld-elf/aarch64/reloc.c (contents, props changed)
head/libexec/rtld-elf/aarch64/rtld_machdep.h (contents, props changed)
head/libexec/rtld-elf/aarch64/rtld_start.S (contents, props changed)
Modified:
head/libexec/rtld-elf/rtld.c
Added: head/libexec/rtld-elf/aarch64/reloc.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/libexec/rtld-elf/aarch64/reloc.c Tue Mar 31 09:51:19 2015 (r280903)
@@ -0,0 +1,317 @@
+/*-
+ * Copytight (c) 2014-2015 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+
+#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 *);
+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)
+{
+ const Elf_Rela *relalim;
+ const Elf_Rela *rela;
+
+ 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:
+ *where += (Elf_Addr)obj->relocbase;
+ 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");
+ return (-1);
+ }
+ 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;
+
+ switch(ELF_R_TYPE(rela->r_info)) {
+ case R_AARCH64_JUMP_SLOT:
+ where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
+ 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;
+ case R_AARCH64_TLSDESC:
+ 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_AARCH64_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;
+
+ 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().
+ */
+ if (obj == obj_rtld)
+ cache = NULL;
+ else
+ 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);
+
+ *where = (Elf_Addr)defobj->relocbase + def->st_value;
+ break;
+ case R_AARCH64_COPY:
+ /*
+ * These are deferred until all other relocations have
+ * been done. All we do here is make sure that the
+ * COPY relocation is not in a shared library. They
+ * are allowed only in executable files.
+ */
+ if (!obj->mainprog) {
+ _rtld_error("%s: Unexpected R_AARCH64_COPY "
+ "relocation in shared library", obj->path);
+ return (-1);
+ }
+ break;
+ case R_AARCH64_RELATIVE:
+ *where = (Elf_Addr)(obj->relocbase + rela->r_addend);
+ break;
+ default:
+ rtld_printf("%s: Unhandled relocation %lu\n",
+ obj->path, ELF_R_TYPE(rela->r_info));
+ return (-1);
+ }
+ }
+
+ 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));
+}
Added: head/libexec/rtld-elf/aarch64/rtld_machdep.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/libexec/rtld-elf/aarch64/rtld_machdep.h Tue Mar 31 09:51:19 2015 (r280903)
@@ -0,0 +1,83 @@
+/*-
+ * 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 <sys/types.h>
+#include <machine/atomic.h>
+
+struct Struct_Obj_Entry;
+
+/* Return the address of the .dynamic section in the dynamic linker. */
+#define rtld_dynamic(obj) \
+({ \
+ Elf_Addr _dynamic_addr; \
+ asm volatile("adr %0, _DYNAMIC" : "=&r"(_dynamic_addr)); \
+ (const Elf_Dyn *)_dynamic_addr; \
+})
+#define RTLD_IS_DYNAMIC() (1)
+
+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
Added: head/libexec/rtld-elf/aarch64/rtld_start.S
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/libexec/rtld-elf/aarch64/rtld_start.S Tue Mar 31 09:51:19 2015 (r280903)
@@ -0,0 +1,113 @@
+/*-
+ * 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 <machine/asm.h>
+__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 */
+
+ mov x0, x20 /* Pass the stack we were given to _rtld */
+ mov x1, sp /* exit_proc */
+ add x2, x1, #8 /* obj_main */
+ 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 */
+END(.rtld_start)
+
+/*
+ * sp + 0 = &GOT[x + 3]
+ * sp + 8 = RA
+ * x16 = &GOT[2]
+ * x17 = &_rtld_bind_start
+ */
+ENTRY(_rtld_bind_start)
+ mov x17, sp
+
+ /* Save the arguments */
+ stp x0, x1, [sp, #-16]!
+ stp x2, x3, [sp, #-16]!
+ stp x4, x5, [sp, #-16]!
+ stp x6, x7, [sp, #-16]!
+
+ /* Calculate reloff */
+ ldr x2, [x17, #0] /* Get the address of the entry */
+ sub x1, x2, x16 /* Find its offset */
+ sub x1, x1, #8 /* Adjust for x16 not being at offset 0 */
+ /* Each rela item has 3 entriesso we need reloff = 3 * index */
+ lsl x3, x1, #1 /* x3 = 2 * offset */
+ add x1, x1, x3 /* x1 = x3 + offset = 3 * offset */
+
+ /* Load obj */
+ ldr x0, [x16, #-8]
+
+ /* Call into rtld */
+ bl _rtld_bind
+
+ /* Restore the registers saved by the plt code */
+ ldp xzr, x30, [sp, #(4 * 16)]
+
+ /* Backup the address to branch to */
+ mov x16, x0
+
+ /* restore the arguments */
+ ldp x6, x7, [sp], #16
+ ldp x4, x5, [sp], #16
+ ldp x2, x3, [sp], #16
+ ldp x0, x1, [sp], #16
+ /* And the part of the stack the plt entry handled */
+ add sp, sp, #16
+
+ /* Call into the correct function */
+ br x16
+END(_rtld_bind_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)
Modified: head/libexec/rtld-elf/rtld.c
==============================================================================
--- head/libexec/rtld-elf/rtld.c Tue Mar 31 08:44:46 2015 (r280902)
+++ head/libexec/rtld-elf/rtld.c Tue Mar 31 09:51:19 2015 (r280903)
@@ -4368,7 +4368,8 @@ tls_get_addr_common(Elf_Addr **dtvp, int
return (tls_get_addr_slow(dtvp, index, offset));
}
-#if defined(__arm__) || defined(__mips__) || defined(__powerpc__)
+#if defined(__aarch64__) || defined(__arm__) || defined(__mips__) || \
+ defined(__powerpc__)
/*
* Allocate Static TLS using the Variant I method.
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