From 534661b91c98492995274c364c8177c45efc63db Mon Sep 17 00:00:00 2001 From: Austin Foxley Date: Sat, 19 Sep 2009 10:04:05 -0700 Subject: ldso/: tls support for dynamic linker Signed-off-by: Austin Foxley --- ldso/ldso/arm/aeabi_read_tp.S | 64 +++++++++++++++++++++++++++++++++++ ldso/ldso/arm/dl-debug.h | 4 ++- ldso/ldso/arm/dl-sysdep.h | 21 +++++++++--- ldso/ldso/arm/elfinterp.c | 52 +++++++++++++++++++++------- ldso/ldso/arm/resolve.S | 4 +++ ldso/ldso/arm/thumb_atomics.S | 79 +++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 206 insertions(+), 18 deletions(-) create mode 100644 ldso/ldso/arm/aeabi_read_tp.S create mode 100644 ldso/ldso/arm/thumb_atomics.S (limited to 'ldso/ldso/arm') diff --git a/ldso/ldso/arm/aeabi_read_tp.S b/ldso/ldso/arm/aeabi_read_tp.S new file mode 100644 index 000000000..f81bae676 --- /dev/null +++ b/ldso/ldso/arm/aeabi_read_tp.S @@ -0,0 +1,64 @@ +/* Copyright (C) 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + +#ifdef __UCLIBC_HAS_THREADS_NATIVE__ + +#include +#include + +/* GCC will emit calls to this routine under -mtp=soft. Linux has an + equivalent helper function (which clobbers fewer registers than + a normal function call) in a high page of memory; tail call to the + helper. + + This function is exported from libc for use by user code. libpthread, librt, + and the dynamic linker get their own private copies, for + performance (and in the case of ld.so, out of necessity); those are + all hidden. */ + +#ifndef NOT_IN_libc + .global __aeabi_read_tp +#else + .hidden __aeabi_read_tp +#endif +ENTRY (__aeabi_read_tp) + mov r0, #0xffff0fff + sub pc, r0, #31 +END (__aeabi_read_tp) + +#endif /* __UCLIBC_HAS_THREADS_NATIVE__ */ + diff --git a/ldso/ldso/arm/dl-debug.h b/ldso/ldso/arm/dl-debug.h index d5103202c..1bca6ff36 100644 --- a/ldso/ldso/arm/dl-debug.h +++ b/ldso/ldso/arm/dl-debug.h @@ -33,12 +33,14 @@ static const char *_dl_reltypes_tab[] = [4] "R_ARM_PC13", "R_ARM_ABS16", "R_ARM_ABS12", "R_ARM_THM_ABS5", [8] "R_ARM_ABS8", "R_ARM_SBREL32","R_ARM_THM_PC22", "R_ARM_THM_PC8", [12] "R_ARM_AMP_VCALL9", "R_ARM_SWI24", "R_ARM_THM_SWI8", "R_ARM_XPC25", - [16] "R_ARM_THM_XPC22", + [16] "R_ARM_THM_XPC22", "R_ARM_TLS_DTPMOD32", "R_ARM_TLS_DTPOFF32", "R_ARM_TLS_TPOFF32", [20] "R_ARM_COPY", "R_ARM_GLOB_DAT","R_ARM_JUMP_SLOT", "R_ARM_RELATIVE", [24] "R_ARM_GOTOFF", "R_ARM_GOTPC", "R_ARM_GOT32", "R_ARM_PLT32", [32] "R_ARM_ALU_PCREL_7_0","R_ARM_ALU_PCREL_15_8","R_ARM_ALU_PCREL_23_15","R_ARM_LDR_SBREL_11_0", [36] "R_ARM_ALU_SBREL_19_12","R_ARM_ALU_SBREL_27_20", [100] "R_ARM_GNU_VTENTRY","R_ARM_GNU_VTINHERIT","R_ARM_THM_PC11","R_ARM_THM_PC9", + [104] "R_ARM_TLS_GD32","R_ARM_TLS_LDM32","R_ARM_TLS_LDO32","R_ARM_TLS_IE32", + [108] "R_ARM_TLS_LE32","R_ARM_TLS_LDO12","R_ARM_TLS_LE12","R_ARM_TLS_IE12GP", [249] "R_ARM_RXPC25", "R_ARM_RSBREL32", "R_ARM_THM_RPC22", "R_ARM_RREL32", [253] "R_ARM_RABS22", "R_ARM_RPC24", "R_ARM_RBASE", }; diff --git a/ldso/ldso/arm/dl-sysdep.h b/ldso/ldso/arm/dl-sysdep.h index 75c58b0ec..5a2912ab5 100644 --- a/ldso/ldso/arm/dl-sysdep.h +++ b/ldso/ldso/arm/dl-sysdep.h @@ -5,6 +5,9 @@ * Copyright (C) 2000-2004 by Erik Andersen */ +#ifndef _ARCH_DL_SYSDEP +#define _ARCH_DL_SYSDEP + /* Define this if the system uses RELOCA. */ #undef ELF_USES_RELOCA #include @@ -55,12 +58,21 @@ static __always_inline unsigned long arm_modulus(unsigned long m, unsigned long struct elf_resolve; unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry); -/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so - PLT entries should not be allowed to define the value. +/* 4096 bytes alignment */ +#define PAGE_ALIGN 0xfffff000 +#define ADDR_ALIGN 0xfff +#define OFFS_ALIGN 0x7ffff000 + +/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or + TLS variable, so undefined references should not be allowed to + define the value. + ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one of the main executable's symbols, as for a COPY reloc. */ -#define elf_machine_type_class(type) \ - ((((type) == R_ARM_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ +#define elf_machine_type_class(type) \ + ((((type) == R_ARM_JUMP_SLOT || (type) == R_ARM_TLS_DTPMOD32 \ + || (type) == R_ARM_TLS_DTPOFF32 || (type) == R_ARM_TLS_TPOFF32) \ + * ELF_RTYPE_CLASS_PLT) \ | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY)) /* Return the link-time address of _DYNAMIC. Conveniently, this is the @@ -136,6 +148,7 @@ elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr, *reloc_addr += load_off; } while (--relative_count); } +#endif /* !_ARCH_DL_SYSDEP */ #ifdef __ARM_EABI__ #define DL_MALLOC_ALIGN 8 /* EABI needs 8 byte alignment for STRD LDRD */ diff --git a/ldso/ldso/arm/elfinterp.c b/ldso/ldso/arm/elfinterp.c index 197975e4a..1469df016 100644 --- a/ldso/ldso/arm/elfinterp.c +++ b/ldso/ldso/arm/elfinterp.c @@ -50,7 +50,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry) Elf32_Sym *symtab; ELF_RELOC *rel_addr; int symtab_index; - char *new_addr; + unsigned long new_addr; char **got_addr; unsigned long instr_addr; @@ -70,7 +70,7 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry) /* Get the address of the GOT entry */ new_addr = _dl_find_hash(symname, tpnt->symbol_scope, - tpnt, ELF_RTYPE_CLASS_PLT); + tpnt, ELF_RTYPE_CLASS_PLT, NULL); if (unlikely(!new_addr)) { _dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname); @@ -89,13 +89,13 @@ unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry) } } if (!_dl_debug_nofixups) { - *got_addr = new_addr; + *got_addr = (char*)new_addr; } #else - *got_addr = new_addr; + *got_addr = (char*)new_addr; #endif - return (unsigned long) new_addr; + return new_addr; } static int @@ -188,28 +188,40 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope, int symtab_index; unsigned long *reloc_addr; unsigned long symbol_addr; + const Elf32_Sym *def = 0; + struct elf_resolve *def_mod = 0; int goof = 0; - reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset); + reloc_addr = (unsigned long *) (tpnt->loadaddr + + (unsigned long) rpnt->r_offset); + reloc_type = ELF32_R_TYPE(rpnt->r_info); symtab_index = ELF32_R_SYM(rpnt->r_info); symbol_addr = 0; if (symtab_index) { - - symbol_addr = (unsigned long) _dl_find_hash(strtab + symtab[symtab_index].st_name, - scope, tpnt, elf_machine_type_class(reloc_type)); + symbol_addr = _dl_find_hash(strtab + symtab[symtab_index].st_name, + scope, tpnt, + elf_machine_type_class(reloc_type), + &def_mod); /* * We want to allow undefined references to weak symbols - this might * have been intentional. We should not be linking local symbols * here, so all bases should be covered. */ - if (!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) { - _dl_dprintf (2, "%s: can't resolve symbol '%s'\n", - _dl_progname, strtab + symtab[symtab_index].st_name); - _dl_exit (1); + if (!symbol_addr && (ELF_ST_TYPE(symtab[symtab_index].st_info) != STT_TLS) + && (ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK)) { + /* This may be non-fatal if called from dlopen. */ + return 1; + } + } else { + /* Relocs against STN_UNDEF are usually treated as using a + symbol value of zero, and using the module containing the + reloc itself. */ + symbol_addr = symtab[symtab_index].st_value; + def_mod = tpnt; } #if defined (__SUPPORT_LD_DEBUG__) @@ -265,6 +277,20 @@ _dl_do_reloc (struct elf_resolve *tpnt,struct dyn_elf *scope, _dl_memcpy((void *) reloc_addr, (void *) symbol_addr, symtab[symtab_index].st_size); break; +#if USE_TLS + case R_ARM_TLS_DTPMOD32: + *reloc_addr = def_mod->l_tls_modid; + break; + + case R_ARM_TLS_DTPOFF32: + *reloc_addr += symbol_addr; + break; + + case R_ARM_TLS_TPOFF32: + CHECK_STATIC_TLS ((struct link_map *) def_mod); + *reloc_addr += (symbol_addr + def_mod->l_tls_offset); + break; +#endif default: return -1; /*call _dl_exit(1) */ } diff --git a/ldso/ldso/arm/resolve.S b/ldso/ldso/arm/resolve.S index b422c334d..08889d06e 100644 --- a/ldso/ldso/arm/resolve.S +++ b/ldso/ldso/arm/resolve.S @@ -95,6 +95,10 @@ #include +#define sl r10 +#define fp r11 +#define ip r12 + .text .align 4 @ 16 byte boundary and there are 32 bytes below (arm case) #if !defined(__thumb__) || defined(__thumb2__) diff --git a/ldso/ldso/arm/thumb_atomics.S b/ldso/ldso/arm/thumb_atomics.S new file mode 100644 index 000000000..f6ae3db3c --- /dev/null +++ b/ldso/ldso/arm/thumb_atomics.S @@ -0,0 +1,79 @@ +/* Copyright (C) 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + +#ifdef __UCLIBC_HAS_THREADS_NATIVE__ + +#include + +#if defined __thumb__ + +/* Out-of-line atomic operations that we can't do in Thumb mode. + This ends up in various libraries where it is needed (and + a few .a archives where it isn't). */ + + .hidden __thumb_swpb +ENTRY (__thumb_swpb) + swpb r0, r0, [r1] + bx lr +END (__thumb_swpb) + + .hidden __thumb_swp +ENTRY (__thumb_swp) + swp r0, r0, [r1] + bx lr +END (__thumb_swp) + + .hidden __thumb_cmpxchg +ENTRY (__thumb_cmpxchg) + stmdb sp!, {r4, lr} + mov r4, r0 +0: ldr r3, [r2] + cmp r3, r4 + bne 1f + mov r0, r4 + mov r3, #0xffff0fff + mov lr, pc + add pc, r3, #(0xffff0fc0 - 0xffff0fff) + bcc 0b + mov r3, r4 +1: mov r0, r3 + ldmia sp!, {r4, pc} +END (__thumb_cmpxchg) + +#endif /* __thumb__ */ +#endif /* __UCLIBC_HAS_THREADS_NATIVE__ */ + -- cgit v1.2.3