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Diffstat (limited to 'linker/linker_mips.cpp')
| -rw-r--r-- | linker/linker_mips.cpp | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/linker/linker_mips.cpp b/linker/linker_mips.cpp deleted file mode 100644 index 71a96e681..000000000 --- a/linker/linker_mips.cpp +++ /dev/null @@ -1,334 +0,0 @@ -/* - * Copyright (C) 2015 The Android Open Source Project - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * * 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 COPYRIGHT HOLDERS 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 - * COPYRIGHT OWNER 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. - */ - -#if !defined(__LP64__) && __mips_isa_rev >= 5 -#include <sys/prctl.h> -#endif - -#include "linker.h" -#include "linker_debug.h" -#include "linker_globals.h" -#include "linker_phdr.h" -#include "linker_relocs.h" -#include "linker_reloc_iterators.h" -#include "linker_sleb128.h" -#include "linker_soinfo.h" - -template bool soinfo::relocate<plain_reloc_iterator>(const VersionTracker& version_tracker, - plain_reloc_iterator&& rel_iterator, - const soinfo_list_t& global_group, - const soinfo_list_t& local_group); - -template bool soinfo::relocate<packed_reloc_iterator<sleb128_decoder>>( - const VersionTracker& version_tracker, - packed_reloc_iterator<sleb128_decoder>&& rel_iterator, - const soinfo_list_t& global_group, - const soinfo_list_t& local_group); - -template <typename ElfRelIteratorT> -bool soinfo::relocate(const VersionTracker& version_tracker, - ElfRelIteratorT&& rel_iterator, - const soinfo_list_t& global_group, - const soinfo_list_t& local_group) { - for (size_t idx = 0; rel_iterator.has_next(); ++idx) { - const auto rel = rel_iterator.next(); - - if (rel == nullptr) { - return false; - } - - ElfW(Word) type = ELFW(R_TYPE)(rel->r_info); - ElfW(Word) sym = ELFW(R_SYM)(rel->r_info); - - ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + load_bias); - ElfW(Addr) sym_addr = 0; - const char* sym_name = nullptr; - - DEBUG("Processing \"%s\" relocation at index %zd", get_realpath(), idx); - if (type == R_GENERIC_NONE) { - continue; - } - - const ElfW(Sym)* s = nullptr; - soinfo* lsi = nullptr; - - if (sym != 0) { - sym_name = get_string(symtab_[sym].st_name); - const version_info* vi = nullptr; - - if (!lookup_version_info(version_tracker, sym, sym_name, &vi)) { - return false; - } - - if (!soinfo_do_lookup(this, sym_name, vi, &lsi, global_group, local_group, &s)) { - return false; - } - - if (s == nullptr) { - // mips does not support relocation with weak-undefined symbols - DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", - sym_name, get_realpath()); - return false; - } else { - // We got a definition. - sym_addr = lsi->resolve_symbol_address(s); - } - count_relocation(kRelocSymbol); - } - - switch (type) { - case R_MIPS_REL32: -#if defined(__LP64__) - // MIPS Elf64_Rel entries contain compound relocations - // We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case - if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 || - ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) { - DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)", - type, static_cast<unsigned>(ELF64_R_TYPE2(rel->r_info)), - static_cast<unsigned>(ELF64_R_TYPE3(rel->r_info)), rel, idx); - return false; - } -#endif - count_relocation(s == nullptr ? kRelocAbsolute : kRelocRelative); - MARK(rel->r_offset); - TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc), - static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*"); - if (s != nullptr) { - *reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr; - } else { - *reinterpret_cast<ElfW(Addr)*>(reloc) += load_bias; - } - break; - default: - DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx); - return false; - } - } - return true; -} - -bool soinfo::mips_relocate_got(const VersionTracker& version_tracker, - const soinfo_list_t& global_group, - const soinfo_list_t& local_group) { - ElfW(Addr)** got = plt_got_; - if (got == nullptr) { - return true; - } - - // got[0] is the address of the lazy resolver function. - // got[1] may be used for a GNU extension. - // FIXME: maybe this should be in a separate routine? - if ((flags_ & FLAG_LINKER) == 0) { - size_t g = 1; - // Check for the high bit to determine whether to skip got[1] - if (reinterpret_cast<intptr_t>(got[g]) < 0) { - g++; - } - // Relocate the local GOT entries. - for (; g < mips_local_gotno_; g++) { - got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + load_bias); - } - } - - // Now for the global GOT entries... - got = plt_got_ + mips_local_gotno_; - for (ElfW(Word) sym = mips_gotsym_; sym < mips_symtabno_; sym++, got++) { - // This is an undefined reference... try to locate it. - const ElfW(Sym)* local_sym = symtab_ + sym; - const char* sym_name = get_string(local_sym->st_name); - soinfo* lsi = nullptr; - const ElfW(Sym)* s = nullptr; - - ElfW(Word) st_visibility = (local_sym->st_other & 0x3); - - if (st_visibility == STV_DEFAULT) { - const version_info* vi = nullptr; - - if (!lookup_version_info(version_tracker, sym, sym_name, &vi)) { - return false; - } - - if (!soinfo_do_lookup(this, sym_name, vi, &lsi, global_group, local_group, &s)) { - return false; - } - } else if (st_visibility == STV_PROTECTED) { - if (local_sym->st_value == 0) { - DL_ERR("%s: invalid symbol \"%s\" (PROTECTED/UNDEFINED) ", - get_realpath(), sym_name); - return false; - } - s = local_sym; - lsi = this; - } else { - DL_ERR("%s: invalid symbol \"%s\" visibility: 0x%x", - get_realpath(), sym_name, st_visibility); - return false; - } - - if (s == nullptr) { - // We only allow an undefined symbol if this is a weak reference. - if (ELF_ST_BIND(local_sym->st_info) != STB_WEAK) { - DL_ERR("%s: cannot locate \"%s\"...", get_realpath(), sym_name); - return false; - } - *got = 0; - } else { - // FIXME: is this sufficient? - // For reference see NetBSD link loader - // http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup - *got = reinterpret_cast<ElfW(Addr)*>(lsi->resolve_symbol_address(s)); - } - } - return true; -} - -#if !defined(__LP64__) - -// Checks for mips32's various floating point abis. -// (Mips64 Android has a single floating point abi and doesn't need any checks) - -// Linux kernel has declarations similar to the following -// in <linux>/arch/mips/include/asm/elf.h, -// but that non-uapi internal header file will never be imported -// into bionic's kernel headers. - -#define PT_MIPS_ABIFLAGS 0x70000003 // is .MIPS.abiflags segment - -struct mips_elf_abiflags_v0 { - uint16_t version; // version of this structure - uint8_t isa_level, isa_rev, gpr_size, cpr1_size, cpr2_size; - uint8_t fp_abi; // mips32 ABI variants for floating point - uint32_t isa_ext, ases, flags1, flags2; -}; - -// Bits of flags1: -#define MIPS_AFL_FLAGS1_ODDSPREG 1 // Uses odd-numbered single-prec fp regs - -// Some values of fp_abi: via compiler flag: -#define MIPS_ABI_FP_ANY 0 // Not tagged or not using any ABIs affected by the differences. -#define MIPS_ABI_FP_DOUBLE 1 // -mdouble-float -#define MIPS_ABI_FP_XX 5 // -mfpxx -#define MIPS_ABI_FP_64A 7 // -mips32r* -mfp64 -mno-odd-spreg - -#if __mips_isa_rev >= 5 -static bool mips_fre_mode_on = false; // have set FRE=1 mode for process -#endif - -bool soinfo::mips_check_and_adjust_fp_modes() { - mips_elf_abiflags_v0* abiflags = nullptr; - int mips_fpabi; - - // Find soinfo's optional .MIPS.abiflags segment - for (size_t i = 0; i<phnum; ++i) { - const ElfW(Phdr)& ph = phdr[i]; - if (ph.p_type == PT_MIPS_ABIFLAGS) { - if (ph.p_filesz < sizeof (mips_elf_abiflags_v0)) { - DL_ERR("Corrupt PT_MIPS_ABIFLAGS header found \"%s\"", get_realpath()); - return false; - } - abiflags = reinterpret_cast<mips_elf_abiflags_v0*>(ph.p_vaddr + load_bias); - break; - } - } - - // FP ABI-variant compatibility checks for MIPS o32 ABI - if (abiflags == nullptr) { - // Old compilers lack the new abiflags section. - // These compilers used -mfp32 -mdouble-float -modd-spreg defaults, - // ie FP32 aka DOUBLE, using odd-numbered single-prec regs - mips_fpabi = MIPS_ABI_FP_DOUBLE; - } else { - mips_fpabi = abiflags->fp_abi; - if ( (abiflags->flags1 & MIPS_AFL_FLAGS1_ODDSPREG) - && (mips_fpabi == MIPS_ABI_FP_XX || - mips_fpabi == MIPS_ABI_FP_64A ) ) { - // Android supports fewer cases than Linux - DL_ERR("Unsupported odd-single-prec FloatPt reg uses in \"%s\"", - get_realpath()); - return false; - } - } - if (!(mips_fpabi == MIPS_ABI_FP_DOUBLE || -#if __mips_isa_rev >= 5 - mips_fpabi == MIPS_ABI_FP_64A || -#endif - mips_fpabi == MIPS_ABI_FP_ANY || - mips_fpabi == MIPS_ABI_FP_XX )) { - DL_ERR("Unsupported MIPS32 FloatPt ABI %d found in \"%s\"", - mips_fpabi, get_realpath()); - return false; - } - -#if __mips_isa_rev >= 5 - // Adjust process's FR Emulation mode, if needed - // - // On Mips R5 & R6, Android runs continuously in FR=1 64bit-fpreg mode. - // NDK mips32 apps compiled with old compilers generate FP32 code - // which expects FR=0 32-bit fp registers. - // NDK mips32 apps compiled with newer compilers generate modeless - // FPXX code which runs on both FR=0 and FR=1 modes. - // Android itself is compiled in FP64A which requires FR=1 mode. - // FP32, FPXX, and FP64A all interlink okay, without dynamic FR mode - // changes during calls. For details, see - // http://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking - // Processes containing FR32 FR=0 code are run via kernel software assist, - // which maps all odd-numbered single-precision reg refs onto the - // upper half of the paired even-numbered double-precision reg. - // FRE=1 triggers traps to the kernel's emulator on every single-precision - // fp op (for both odd and even-numbered registers). - // Turning on FRE=1 traps is done at most once per process, simultanously - // for all threads of that process, when dlopen discovers FP32 code. - // The kernel repacks threads' registers when FRE mode is turn on or off. - // These asynchronous adjustments are wrong if any thread was executing - // FPXX code using odd-numbered single-precision regs. - // Current Android compilers default to the -mno-oddspreg option, - // and this requirement is checked by Android's dlopen. - // So FRE can always be safely turned on for FP32, anytime. - // Deferred enhancement: Allow loading of odd-spreg FPXX modules. - - if (mips_fpabi == MIPS_ABI_FP_DOUBLE && !mips_fre_mode_on) { - // Turn on FRE mode, which emulates mode-sensitive FR=0 code on FR=1 - // register files, by trapping to kernel on refs to single-precision regs - if (prctl(PR_SET_FP_MODE, PR_FP_MODE_FR|PR_FP_MODE_FRE)) { - DL_ERR("Kernel or cpu failed to set FRE mode required for running \"%s\"", - get_realpath()); - return false; - } - DL_WARN("Using FRE=1 mode to run \"%s\"", get_realpath()); - mips_fre_mode_on = true; // Avoid future redundant mode-switch calls - // FRE mode is never turned back off. - // Deferred enhancement: - // Reset FRE mode when dlclose() removes all FP32 modules - } -#else - // Android runs continuously in FR=0 32bit-fpreg mode. -#endif // __mips_isa_rev - return true; -} - -#endif // __LP64___ |