Date: Thu, 24 Dec 2015 15:47:51 +0000 (UTC) From: Ruslan Bukin <br@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r292691 - in head/libexec/rtld-elf: . riscv Message-ID: <201512241547.tBOFlpdt009099@repo.freebsd.org>
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Author: br Date: Thu Dec 24 15:47:51 2015 New Revision: 292691 URL: https://svnweb.freebsd.org/changeset/base/292691 Log: Add support for RISC-V architecture. Reviewed by: andrew, kib Sponsored by: DARPA, AFRL Sponsored by: HEIF5 Differential Revision: https://reviews.freebsd.org/D4679 Added: head/libexec/rtld-elf/riscv/ head/libexec/rtld-elf/riscv/reloc.c (contents, props changed) head/libexec/rtld-elf/riscv/rtld_machdep.h (contents, props changed) head/libexec/rtld-elf/riscv/rtld_start.S (contents, props changed) Modified: head/libexec/rtld-elf/rtld.c Added: head/libexec/rtld-elf/riscv/reloc.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/libexec/rtld-elf/riscv/reloc.c Thu Dec 24 15:47:51 2015 (r292691) @@ -0,0 +1,400 @@ +/*- + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 + * ("CTSRD"), as part of the DARPA CRASH research programme. + * + * This software was developed by the University of Cambridge Computer + * Laboratory as part of the CTSRD Project, with support from the UK Higher + * Education Innovation Fund (HEIF). + * + * 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) + +void _exit(int); + +uint64_t +set_gp(Obj_Entry *obj) +{ + uint64_t old; + SymLook req; + uint64_t gp; + int res; + + __asm __volatile("mv %0, gp" : "=r"(old)); + + symlook_init(&req, "_gp"); + req.ventry = NULL; + req.flags = SYMLOOK_EARLY; + res = symlook_obj(&req, obj); + + if (res == 0) { + gp = req.sym_out->st_value; + __asm __volatile("mv gp, %0" :: "r"(gp)); + } + + return (old); +} + +void +init_pltgot(Obj_Entry *obj) +{ + + if (obj->pltgot != NULL) { + obj->pltgot[0] = (Elf_Addr)&_rtld_bind_start; + obj->pltgot[1] = (Elf_Addr)obj; + } +} + +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_RISCV_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; + + assert(ELF_R_TYPE(rela->r_info) == R_RISCV_JUMP_SLOT); + + where = (Elf_Addr *)(obj->relocbase + rela->r_offset); + *where += (Elf_Addr)obj->relocbase; + } + + 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_RISCV_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_RISCV_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_RISCV_JUMP_SLOT: + /* This will be handled by the plt/jmpslot routines */ + break; + case R_RISCV_NONE: + break; + case R_RISCV_64: + def = find_symdef(symnum, obj, &defobj, flags, cache, + lockstate); + if (def == NULL) + return (-1); + + *where = (Elf_Addr)(defobj->relocbase + def->st_value + + rela->r_addend); + break; + case R_RISCV_TLS_DTPMOD64: + def = find_symdef(symnum, obj, &defobj, flags, cache, + lockstate); + if (def == NULL) + return -1; + + *where += (Elf_Addr)defobj->tlsindex; + break; + case R_RISCV_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_RISCV_COPY " + "relocation in shared library", obj->path); + return (-1); + } + break; + case R_RISCV_TLS_DTPREL64: + def = find_symdef(symnum, obj, &defobj, flags, cache, + lockstate); + if (def == NULL) + return (-1); + /* + * We lazily allocate offsets for static TLS as we + * see the first relocation that references the + * TLS block. This allows us to support (small + * amounts of) static TLS in dynamically loaded + * modules. If we run out of space, we generate an + * error. + */ + if (!defobj->tls_done) { + if (!allocate_tls_offset((Obj_Entry*) defobj)) { + _rtld_error( + "%s: No space available for static " + "Thread Local Storage", obj->path); + return (-1); + } + } + + *where += (Elf_Addr)(def->st_value + rela->r_addend + - TLS_DTV_OFFSET); + break; + case R_RISCV_TLS_TPREL64: + def = find_symdef(symnum, obj, &defobj, flags, cache, + lockstate); + if (def == NULL) + return (-1); + + /* + * We lazily allocate offsets for static TLS as we + * see the first relocation that references the + * TLS block. This allows us to support (small + * amounts of) static TLS in dynamically loaded + * modules. If we run out of space, we generate an + * error. + */ + if (!defobj->tls_done) { + if (!allocate_tls_offset((Obj_Entry*) defobj)) { + _rtld_error( + "%s: No space available for static " + "Thread Local Storage", obj->path); + return (-1); + } + } + + *where = (def->st_value + rela->r_addend + + defobj->tlsoffset - TLS_TP_OFFSET); + break; + case R_RISCV_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 **) ((char *)allocate_tls(objs, NULL, TLS_TCB_SIZE, 16) + + TLS_TP_OFFSET + TLS_TCB_SIZE); + + __asm __volatile("mv tp, %0" :: "r"(tp)); +} + +void * +__tls_get_addr(tls_index* ti) +{ + char *_tp; + void *p; + + __asm __volatile("mv %0, tp" : "=r" (_tp)); + + p = tls_get_addr_common((Elf_Addr**)((Elf_Addr)_tp - TLS_TP_OFFSET + - TLS_TCB_SIZE), ti->ti_module, ti->ti_offset); + + return (p + TLS_DTV_OFFSET); +} Added: head/libexec/rtld-elf/riscv/rtld_machdep.h ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/libexec/rtld-elf/riscv/rtld_machdep.h Thu Dec 24 15:47:51 2015 (r292691) @@ -0,0 +1,111 @@ +/*- + * Copyright (c) 1999, 2000 John D. Polstra. + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * Portions of this software were developed by SRI International and the + * University of Cambridge Computer Laboratory under DARPA/AFRL contract + * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme. + * + * Portions of this software were developed by the University of Cambridge + * Computer Laboratory as part of the CTSRD Project, with support from the + * UK Higher Education Innovation Fund (HEIF). + * + * 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; + +uint64_t set_gp(struct Struct_Obj_Entry *obj); + +/* Return the address of the .dynamic section in the dynamic linker. */ +#define rtld_dynamic(obj) \ +({ \ + Elf_Addr _dynamic_addr; \ + __asm __volatile("lla %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) \ +({ \ + uint64_t old0; \ + old0 = set_gp(obj); \ + (((InitFunc)(target))()); \ + __asm __volatile("mv gp, %0" :: "r"(old0)); \ +}) + +#define call_init_pointer(obj, target) \ +({ \ + uint64_t old1; \ + old1 = set_gp(obj); \ + (((InitArrFunc)(target))(main_argc, main_argv, environ)); \ + __asm __volatile("mv gp, %0" :: "r"(old1)); \ +}) + +/* + * Lazy binding entry point, called via PLT. + */ +void _rtld_bind_start(void); + +/* + * TLS + */ +#define TLS_TP_OFFSET 0x0 +#define TLS_DTV_OFFSET 0x800 +#define TLS_TCB_SIZE 16 + +#define round(size, align) \ + (((size) + (align) - 1) & ~((align) - 1)) +#define calculate_first_tls_offset(size, align) \ + round(16, align) +#define calculate_tls_offset(prev_offset, prev_size, size, align) \ + round(prev_offset + prev_size, align) +#define calculate_tls_end(off, size) ((off) + (size)) + +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/riscv/rtld_start.S ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/libexec/rtld-elf/riscv/rtld_start.S Thu Dec 24 15:47:51 2015 (r292691) @@ -0,0 +1,129 @@ +/*- + * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> + * All rights reserved. + * + * This software was developed by SRI International and the University of + * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 + * ("CTSRD"), as part of the DARPA CRASH research programme. + * + * This software was developed by the University of Cambridge Computer + * Laboratory as part of the CTSRD Project, with support from the UK Higher + * Education Innovation Fund (HEIF). + * + * 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("$FreeBSD$"); + +/* + * func_ptr_type + * _rtld(Elf_Addr *sp, func_ptr_type *exit_proc, Obj_Entry **objp) + */ + +ENTRY(.rtld_start) + mv s0, a0 /* Put ps_strings in a callee-saved register */ + mv s1, sp /* And the stack pointer */ + + addi sp, sp, -16 /* Make room for obj_main & exit proc */ + + mv a1, sp /* exit_proc */ + addi a2, a1, 8 /* obj_main */ + jal _rtld /* Call the loader */ + mv t0, a0 /* Backup the entry point */ + + ld a2, 0(sp) /* Load cleanup */ + ld a1, 8(sp) /* Load obj_main */ + mv a0, s0 /* Restore ps_strings */ + mv sp, s1 /* Restore the stack pointer */ + jr t0 /* Jump to the entry point */ +END(.rtld_start) + +/* + * t0 = obj pointer + * t1 = reloc offset + */ +ENTRY(_rtld_bind_start) + /* Save the arguments and ra */ + addi sp, sp, -(8 * 25) + sd a0, (8 * 0)(sp) + sd a1, (8 * 1)(sp) + sd a2, (8 * 2)(sp) + sd a3, (8 * 3)(sp) + sd a4, (8 * 4)(sp) + sd a5, (8 * 5)(sp) + sd a6, (8 * 6)(sp) + sd a7, (8 * 7)(sp) + sd ra, (8 * 8)(sp) +#if 0 + /* RISCVTODO VFP */ + /* Save any floating-point arguments */ + fsq fa0, (8 * 9)(sp) + fsq fa1, (8 * 11)(sp) + fsq fa2, (8 * 13)(sp) + fsq fa3, (8 * 15)(sp) + fsq fa4, (8 * 17)(sp) + fsq fa5, (8 * 19)(sp) + fsq fa6, (8 * 21)(sp) + fsq fa7, (8 * 23)(sp) +#endif + + /* Reloc offset is 3x of the .got.plt offset */ + slli a1, t1, 1 /* Mult items by 2 */ + add a1, a1, t1 /* Plus item */ + + /* Load obj */ + mv a0, t0 + + /* Call into rtld */ + jal _rtld_bind + + /* Backup the address to branch to */ + mv t0, a0 + + /* Restore the arguments and ra */ + ld a0, (8 * 0)(sp) + ld a1, (8 * 1)(sp) + ld a2, (8 * 2)(sp) + ld a3, (8 * 3)(sp) + ld a4, (8 * 4)(sp) + ld a5, (8 * 5)(sp) + ld a6, (8 * 6)(sp) + ld a7, (8 * 7)(sp) + ld ra, (8 * 8)(sp) +#if 0 + /* RISCVTODO VFP */ + /* Restore floating-point arguments */ + flq fa0, (8 * 9)(sp) + flq fa1, (8 * 11)(sp) + flq fa2, (8 * 13)(sp) + flq fa3, (8 * 15)(sp) + flq fa4, (8 * 17)(sp) + flq fa5, (8 * 19)(sp) + flq fa6, (8 * 21)(sp) + flq fa7, (8 * 23)(sp) +#endif + addi sp, sp, (8 * 25) + + /* Call into the correct function */ + jr t0 +END(_rtld_bind_start) Modified: head/libexec/rtld-elf/rtld.c ============================================================================== --- head/libexec/rtld-elf/rtld.c Thu Dec 24 14:53:29 2015 (r292690) +++ head/libexec/rtld-elf/rtld.c Thu Dec 24 15:47:51 2015 (r292691) @@ -4396,7 +4396,7 @@ tls_get_addr_common(Elf_Addr **dtvp, int } #if defined(__aarch64__) || defined(__arm__) || defined(__mips__) || \ - defined(__powerpc__) + defined(__powerpc__) || defined(__riscv__) /* * Allocate Static TLS using the Variant I method.
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