1/* 2 * Copyright 2010 Tilera Corporation. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 11 * NON INFRINGEMENT. See the GNU General Public License for 12 * more details. 13 */ 14 15#ifndef _ASM_TILE_ELF_H 16#define _ASM_TILE_ELF_H 17 18/* 19 * ELF register definitions. 20 */ 21 22#include <arch/chip.h> 23 24#include <linux/ptrace.h> 25#include <asm/byteorder.h> 26#include <asm/page.h> 27 28typedef unsigned long elf_greg_t; 29 30#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t)) 31typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 32 33#define EM_TILE64 187 34#define EM_TILEPRO 188 35#define EM_TILEGX 191 36 37/* Provide a nominal data structure. */ 38#define ELF_NFPREG 0 39typedef double elf_fpreg_t; 40typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; 41 42#ifdef __tilegx__ 43#define ELF_CLASS ELFCLASS64 44#else 45#define ELF_CLASS ELFCLASS32 46#endif 47#define ELF_DATA ELFDATA2LSB 48 49/* 50 * There seems to be a bug in how compat_binfmt_elf.c works: it 51 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info(). 52 * Hack around this by providing an enum value of ELF_ARCH. 53 */ 54enum { ELF_ARCH = CHIP_ELF_TYPE() }; 55#define ELF_ARCH ELF_ARCH 56 57/* 58 * This is used to ensure we don't load something for the wrong architecture. 59 */ 60#define elf_check_arch(x) \ 61 ((x)->e_ident[EI_CLASS] == ELF_CLASS && \ 62 (x)->e_machine == CHIP_ELF_TYPE()) 63 64/* The module loader only handles a few relocation types. */ 65#ifndef __tilegx__ 66#define R_TILE_32 1 67#define R_TILE_JOFFLONG_X1 15 68#define R_TILE_IMM16_X0_LO 25 69#define R_TILE_IMM16_X1_LO 26 70#define R_TILE_IMM16_X0_HA 29 71#define R_TILE_IMM16_X1_HA 30 72#else 73#define R_TILEGX_64 1 74#define R_TILEGX_JUMPOFF_X1 21 75#define R_TILEGX_IMM16_X0_HW0 36 76#define R_TILEGX_IMM16_X1_HW0 37 77#define R_TILEGX_IMM16_X0_HW1 38 78#define R_TILEGX_IMM16_X1_HW1 39 79#define R_TILEGX_IMM16_X0_HW2_LAST 48 80#define R_TILEGX_IMM16_X1_HW2_LAST 49 81#endif 82 83/* Use standard page size for core dumps. */ 84#define ELF_EXEC_PAGESIZE PAGE_SIZE 85 86/* 87 * This is the location that an ET_DYN program is loaded if exec'ed. Typical 88 * use of this is to invoke "./ld.so someprog" to test out a new version of 89 * the loader. We need to make sure that it is out of the way of the program 90 * that it will "exec", and that there is sufficient room for the brk. 91 */ 92#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) 93 94#define ELF_CORE_COPY_REGS(_dest, _regs) \ 95 memcpy((char *) &_dest, (char *) _regs, \ 96 sizeof(struct pt_regs)); 97 98/* No additional FP registers to copy. */ 99#define ELF_CORE_COPY_FPREGS(t, fpu) 0 100 101/* 102 * This yields a mask that user programs can use to figure out what 103 * instruction set this CPU supports. This could be done in user space, 104 * but it's not easy, and we've already done it here. 105 */ 106#define ELF_HWCAP (0) 107 108/* 109 * This yields a string that ld.so will use to load implementation 110 * specific libraries for optimization. This is more specific in 111 * intent than poking at uname or /proc/cpuinfo. 112 */ 113#define ELF_PLATFORM (NULL) 114 115extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr); 116 117#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr) 118 119extern int dump_task_regs(struct task_struct *, elf_gregset_t *); 120#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs) 121 122/* Tilera Linux has no personalities currently, so no need to do anything. */ 123#define SET_PERSONALITY(ex) do { } while (0) 124 125#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 126/* Support auto-mapping of the user interrupt vectors. */ 127struct linux_binprm; 128extern int arch_setup_additional_pages(struct linux_binprm *bprm, 129 int executable_stack); 130#ifdef CONFIG_COMPAT 131 132#define COMPAT_ELF_PLATFORM "tilegx-m32" 133 134/* 135 * "Compat" binaries have the same machine type, but 32-bit class, 136 * since they're not a separate machine type, but just a 32-bit 137 * variant of the standard 64-bit architecture. 138 */ 139#define compat_elf_check_arch(x) \ 140 ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \ 141 (x)->e_machine == CHIP_ELF_TYPE()) 142 143#define compat_start_thread(regs, ip, usp) do { \ 144 regs->pc = ptr_to_compat_reg((void *)(ip)); \ 145 regs->sp = ptr_to_compat_reg((void *)(usp)); \ 146 } while (0) 147 148/* 149 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT. 150 */ 151#undef SET_PERSONALITY 152#define SET_PERSONALITY(ex) \ 153do { \ 154 current->personality = PER_LINUX; \ 155 current_thread_info()->status &= ~TS_COMPAT; \ 156} while (0) 157#define COMPAT_SET_PERSONALITY(ex) \ 158do { \ 159 current->personality = PER_LINUX_32BIT; \ 160 current_thread_info()->status |= TS_COMPAT; \ 161} while (0) 162 163#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2) 164 165#endif /* CONFIG_COMPAT */ 166 167#endif /* _ASM_TILE_ELF_H */ 168