// mips.h -- ELF definitions specific to EM_MIPS -*- C++ -*- // Copyright (C) 2012-2014 Free Software Foundation, Inc. // Written by Sasa Stankovic // and Aleksandar Simeonov . // This file is part of elfcpp. // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU Library General Public License // as published by the Free Software Foundation; either version 2, or // (at your option) any later version. // In addition to the permissions in the GNU Library General Public // License, the Free Software Foundation gives you unlimited // permission to link the compiled version of this file into // combinations with other programs, and to distribute those // combinations without any restriction coming from the use of this // file. (The Library Public License restrictions do apply in other // respects; for example, they cover modification of the file, and /// distribution when not linked into a combined executable.) // This program 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 // Library General Public License for more details. // You should have received a copy of the GNU Library General Public // License along with this program; if not, write to the Free Software // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA // 02110-1301, USA. #ifndef ELFCPP_MIPS_H #define ELFCPP_MIPS_H // Documentation for the MIPS relocs is taken from // http://math-atlas.sourceforge.net/devel/assembly/mipsabi32.pdf namespace elfcpp { // // MIPS Relocation Codes // enum { R_MIPS_NONE = 0, R_MIPS_16 = 1, R_MIPS_32 = 2, // In Elf 64: alias R_MIPS_ADD R_MIPS_REL32 = 3, // In Elf 64: alias R_MIPS_REL R_MIPS_26 = 4, R_MIPS_HI16 = 5, R_MIPS_LO16 = 6, R_MIPS_GPREL16 = 7, // In Elf 64: alias R_MIPS_GPREL R_MIPS_LITERAL = 8, R_MIPS_GOT16 = 9, // In Elf 64: alias R_MIPS_GOT R_MIPS_PC16 = 10, R_MIPS_CALL16 = 11, // In Elf 64: alias R_MIPS_CALL R_MIPS_GPREL32 = 12, R_MIPS_UNUSED1 = 13, R_MIPS_UNUSED2 = 14, R_MIPS_UNUSED3 = 15, R_MIPS_SHIFT5 = 16, R_MIPS_SHIFT6 = 17, R_MIPS_64 = 18, R_MIPS_GOT_DISP = 19, R_MIPS_GOT_PAGE = 20, R_MIPS_GOT_OFST = 21, R_MIPS_GOT_HI16 = 22, R_MIPS_GOT_LO16 = 23, R_MIPS_SUB = 24, R_MIPS_INSERT_A = 25, R_MIPS_INSERT_B = 26, R_MIPS_DELETE = 27, R_MIPS_HIGHER = 28, R_MIPS_HIGHEST = 29, R_MIPS_CALL_HI16 = 30, R_MIPS_CALL_LO16 = 31, R_MIPS_SCN_DISP = 32, R_MIPS_REL16 = 33, R_MIPS_ADD_IMMEDIATE = 34, R_MIPS_PJUMP = 35, R_MIPS_RELGOT = 36, R_MIPS_JALR = 37, // TLS relocations. R_MIPS_TLS_DTPMOD32 = 38, R_MIPS_TLS_DTPREL32 = 39, R_MIPS_TLS_DTPMOD64 = 40, R_MIPS_TLS_DTPREL64 = 41, R_MIPS_TLS_GD = 42, R_MIPS_TLS_LDM = 43, R_MIPS_TLS_DTPREL_HI16 = 44, R_MIPS_TLS_DTPREL_LO16 = 45, R_MIPS_TLS_GOTTPREL = 46, R_MIPS_TLS_TPREL32 = 47, R_MIPS_TLS_TPREL64 = 48, R_MIPS_TLS_TPREL_HI16 = 49, R_MIPS_TLS_TPREL_LO16 = 50, R_MIPS_GLOB_DAT = 51, // These relocs are used for the mips16. R_MIPS16_26 = 100, R_MIPS16_GPREL = 101, R_MIPS16_GOT16 = 102, R_MIPS16_CALL16 = 103, R_MIPS16_HI16 = 104, R_MIPS16_LO16 = 105, R_MIPS16_TLS_GD = 106, R_MIPS16_TLS_LDM = 107, R_MIPS16_TLS_DTPREL_HI16 = 108, R_MIPS16_TLS_DTPREL_LO16 = 109, R_MIPS16_TLS_GOTTPREL = 110, R_MIPS16_TLS_TPREL_HI16 = 111, R_MIPS16_TLS_TPREL_LO16 = 112, R_MIPS_COPY = 126, R_MIPS_JUMP_SLOT = 127, // These relocations are specific to microMIPS. R_MICROMIPS_26_S1 = 133, R_MICROMIPS_HI16 = 134, R_MICROMIPS_LO16 = 135, R_MICROMIPS_GPREL16 = 136, // In Elf 64: alias R_MICROMIPS_GPREL R_MICROMIPS_LITERAL = 137, R_MICROMIPS_GOT16 = 138, // In Elf 64: alias R_MICROMIPS_GOT R_MICROMIPS_PC7_S1 = 139, R_MICROMIPS_PC10_S1 = 140, R_MICROMIPS_PC16_S1 = 141, R_MICROMIPS_CALL16 = 142, // In Elf 64: alias R_MICROMIPS_CALL R_MICROMIPS_GOT_DISP = 145, R_MICROMIPS_GOT_PAGE = 146, R_MICROMIPS_GOT_OFST = 147, R_MICROMIPS_GOT_HI16 = 148, R_MICROMIPS_GOT_LO16 = 149, R_MICROMIPS_SUB = 150, R_MICROMIPS_HIGHER = 151, R_MICROMIPS_HIGHEST = 152, R_MICROMIPS_CALL_HI16 = 153, R_MICROMIPS_CALL_LO16 = 154, R_MICROMIPS_SCN_DISP = 155, R_MICROMIPS_JALR = 156, R_MICROMIPS_HI0_LO16 = 157, // TLS relocations. R_MICROMIPS_TLS_GD = 162, R_MICROMIPS_TLS_LDM = 163, R_MICROMIPS_TLS_DTPREL_HI16 = 164, R_MICROMIPS_TLS_DTPREL_LO16 = 165, R_MICROMIPS_TLS_GOTTPREL = 166, R_MICROMIPS_TLS_TPREL_HI16 = 169, R_MICROMIPS_TLS_TPREL_LO16 = 170, // microMIPS GP- and PC-relative relocations. R_MICROMIPS_GPREL7_S2 = 172, R_MICROMIPS_PC23_S2 = 173, // This was a GNU extension used by embedded-PIC. It was co-opted by // mips-linux for exception-handling data. GCC stopped using it in // May, 2004, then started using it again for compact unwind tables. R_MIPS_PC32 = 248, R_MIPS_EH = 249, // This relocation is used internally by gas. R_MIPS_GNU_REL16_S2 = 250, // These are GNU extensions to enable C++ vtable garbage collection. R_MIPS_GNU_VTINHERIT = 253, R_MIPS_GNU_VTENTRY = 254 }; // Processor specific flags for the ELF header e_flags field. enum { // At least one .noreorder directive appears in the source. EF_MIPS_NOREORDER = 0x00000001, // File contains position independent code. EF_MIPS_PIC = 0x00000002, // Code in file uses the standard calling sequence for calling // position independent code. EF_MIPS_CPIC = 0x00000004, // ??? Unknown flag, set in IRIX 6's BSDdup2.o in libbsd.a. EF_MIPS_XGOT = 0x00000008, // Code in file uses UCODE (obsolete) EF_MIPS_UCODE = 0x00000010, // Code in file uses new ABI (-n32 on Irix 6). EF_MIPS_ABI2 = 0x00000020, // Process the .MIPS.options section first by ld EF_MIPS_OPTIONS_FIRST = 0x00000080, // Architectural Extensions used by this file EF_MIPS_ARCH_ASE = 0x0f000000, // Use MDMX multimedia extensions EF_MIPS_ARCH_ASE_MDMX = 0x08000000, // Use MIPS-16 ISA extensions EF_MIPS_ARCH_ASE_M16 = 0x04000000, // Use MICROMIPS ISA extensions. EF_MIPS_ARCH_ASE_MICROMIPS = 0x02000000, // Indicates code compiled for a 64-bit machine in 32-bit mode. // (regs are 32-bits wide.) EF_MIPS_32BITMODE = 0x00000100, // MIPS dynamic EF_MIPS_DYNAMIC = 0x40 }; // Machine variant if we know it. This field was invented at Cygnus, // but it is hoped that other vendors will adopt it. If some standard // is developed, this code should be changed to follow it. enum { EF_MIPS_MACH = 0x00FF0000, // Cygnus is choosing values between 80 and 9F; // 00 - 7F should be left for a future standard; // the rest are open. E_MIPS_MACH_3900 = 0x00810000, E_MIPS_MACH_4010 = 0x00820000, E_MIPS_MACH_4100 = 0x00830000, E_MIPS_MACH_4650 = 0x00850000, E_MIPS_MACH_4120 = 0x00870000, E_MIPS_MACH_4111 = 0x00880000, E_MIPS_MACH_SB1 = 0x008a0000, E_MIPS_MACH_OCTEON = 0x008b0000, E_MIPS_MACH_XLR = 0x008c0000, E_MIPS_MACH_OCTEON2 = 0x008d0000, E_MIPS_MACH_OCTEON3 = 0x008e0000, E_MIPS_MACH_5400 = 0x00910000, E_MIPS_MACH_5500 = 0x00980000, E_MIPS_MACH_9000 = 0x00990000, E_MIPS_MACH_LS2E = 0x00A00000, E_MIPS_MACH_LS2F = 0x00A10000, E_MIPS_MACH_LS3A = 0x00A20000, }; // MIPS architecture enum { // Four bit MIPS architecture field. EF_MIPS_ARCH = 0xf0000000, // -mips1 code. E_MIPS_ARCH_1 = 0x00000000, // -mips2 code. E_MIPS_ARCH_2 = 0x10000000, // -mips3 code. E_MIPS_ARCH_3 = 0x20000000, // -mips4 code. E_MIPS_ARCH_4 = 0x30000000, // -mips5 code. E_MIPS_ARCH_5 = 0x40000000, // -mips32 code. E_MIPS_ARCH_32 = 0x50000000, // -mips64 code. E_MIPS_ARCH_64 = 0x60000000, // -mips32r2 code. E_MIPS_ARCH_32R2 = 0x70000000, // -mips64r2 code. E_MIPS_ARCH_64R2 = 0x80000000, // -mips32r6 code. E_MIPS_ARCH_32R6 = 0x90000000, // -mips64r6 code. E_MIPS_ARCH_64R6 = 0xa0000000, }; enum { // Mask to extract ABI version, not really a flag value. EF_MIPS_ABI = 0x0000F000, // The original o32 abi. E_MIPS_ABI_O32 = 0x00001000, // O32 extended to work on 64 bit architectures E_MIPS_ABI_O64 = 0x00002000, // EABI in 32 bit mode E_MIPS_ABI_EABI32 = 0x00003000, // EABI in 64 bit mode E_MIPS_ABI_EABI64 = 0x00004000, }; // Dynamic section MIPS flags enum { // None RHF_NONE = 0x00000000, // Use shortcut pointers RHF_QUICKSTART = 0x00000001, // Hash size not power of two RHF_NOTPOT = 0x00000002, // Ignore LD_LIBRARY_PATH RHF_NO_LIBRARY_REPLACEMENT = 0x00000004 }; // Special values for the st_other field in the symbol table. enum { // Two topmost bits denote the MIPS ISA for .text symbols: // + 00 -- standard MIPS code, // + 10 -- microMIPS code, // + 11 -- MIPS16 code; requires the following two bits to be set too. // Note that one of the MIPS16 bits overlaps with STO_MIPS_PIC. STO_MIPS_ISA = 0xc0, // The mask spanning the rest of MIPS psABI flags. At most one is expected // to be set except for STO_MIPS16. STO_MIPS_FLAGS = ~(STO_MIPS_ISA | 0x3), // The MIPS psABI was updated in 2008 with support for PLTs and copy // relocs. There are therefore two types of nonzero SHN_UNDEF functions: // PLT entries and traditional MIPS lazy binding stubs. We mark the former // with STO_MIPS_PLT to distinguish them from the latter. STO_MIPS_PLT = 0x8, // This value is used to mark PIC functions in an object that mixes // PIC and non-PIC. Note that this bit overlaps with STO_MIPS16, // although MIPS16 symbols are never considered to be MIPS_PIC. STO_MIPS_PIC = 0x20, // This value is used for a mips16 .text symbol. STO_MIPS16 = 0xf0, // This value is used for a microMIPS .text symbol. To distinguish from // STO_MIPS16, we set top two bits to be 10 to denote STO_MICROMIPS. The // mask is STO_MIPS_ISA. STO_MICROMIPS = 0x80 }; // Values for base offsets for thread-local storage enum { TP_OFFSET = 0x7000, DTP_OFFSET = 0x8000 }; bool elf_st_is_mips16(unsigned char st_other) { return (st_other & elfcpp::STO_MIPS16) == elfcpp::STO_MIPS16; } bool elf_st_is_micromips(unsigned char st_other) { return (st_other & elfcpp::STO_MIPS_ISA) == elfcpp::STO_MICROMIPS; } // Whether the ABI is N32. bool abi_n32(elfcpp::Elf_Word e_flags) { return (e_flags & elfcpp::EF_MIPS_ABI2) != 0; } // Whether the ABI is N64. bool abi_64(unsigned char ei_class) { return ei_class == elfcpp::ELFCLASS64; } // Whether the file has microMIPS code. bool is_micromips(elfcpp::Elf_Word e_flags) { return (e_flags & elfcpp::EF_MIPS_ARCH_ASE_MICROMIPS) != 0; } // Values which may appear in the kind field of an Elf_Options structure. enum { // Undefined. ODK_NULL = 0, // Register usage and GP value. ODK_REGINFO = 1, // Exception processing information. ODK_EXCEPTIONS = 2, // Section padding information. ODK_PAD = 3, // Hardware workarounds performed. ODK_HWPATCH = 4, // Fill value used by the linker. ODK_FILL = 5, // Reserved space for desktop tools. ODK_TAGS = 6, // Hardware workarounds, AND bits when merging. ODK_HWAND = 7, // Hardware workarounds, OR bits when merging. ODK_HWOR = 8, // GP group to use for text/data sections. ODK_GP_GROUP = 9, // ID information. ODK_IDENT = 10 }; } // End namespace elfcpp. #endif // !defined(ELFCPP_MIPS_H)