1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> 4 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> 5 * Copyright (C) 2012 Regents of the University of California 6 */ 7 8 #ifndef _ASM_RISCV_ELF_H 9 #define _ASM_RISCV_ELF_H 10 11 #include <uapi/linux/elf.h> 12 #include <linux/compat.h> 13 #include <uapi/asm/elf.h> 14 #include <asm/auxvec.h> 15 #include <asm/byteorder.h> 16 #include <asm/cacheinfo.h> 17 18 /* 19 * These are used to set parameters in the core dumps. 20 */ 21 #define ELF_ARCH EM_RISCV 22 23 #ifndef ELF_CLASS 24 #ifdef CONFIG_64BIT 25 #define ELF_CLASS ELFCLASS64 26 #else 27 #define ELF_CLASS ELFCLASS32 28 #endif 29 #endif 30 31 #define ELF_DATA ELFDATA2LSB 32 33 /* 34 * This is used to ensure we don't load something for the wrong architecture. 35 */ 36 #define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \ 37 ((x)->e_ident[EI_CLASS] == ELF_CLASS)) 38 39 extern bool compat_elf_check_arch(Elf32_Ehdr *hdr); 40 #define compat_elf_check_arch compat_elf_check_arch 41 42 #define CORE_DUMP_USE_REGSET 43 #define ELF_EXEC_PAGESIZE (PAGE_SIZE) 44 45 /* 46 * This is the location that an ET_DYN program is loaded if exec'ed. Typical 47 * use of this is to invoke "./ld.so someprog" to test out a new version of 48 * the loader. We need to make sure that it is out of the way of the program 49 * that it will "exec", and that there is sufficient room for the brk. 50 */ 51 #define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2) 52 53 #ifdef CONFIG_64BIT 54 #ifdef CONFIG_COMPAT 55 #define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \ 56 0x7ff >> (PAGE_SHIFT - 12) : \ 57 0x3ffff >> (PAGE_SHIFT - 12)) 58 #else 59 #define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12)) 60 #endif 61 #endif 62 /* 63 * This yields a mask that user programs can use to figure out what 64 * instruction set this CPU supports. This could be done in user space, 65 * but it's not easy, and we've already done it here. 66 */ 67 #define ELF_HWCAP (elf_hwcap) 68 extern unsigned long elf_hwcap; 69 70 /* 71 * This yields a string that ld.so will use to load implementation 72 * specific libraries for optimization. This is more specific in 73 * intent than poking at uname or /proc/cpuinfo. 74 */ 75 #define ELF_PLATFORM (NULL) 76 77 #define COMPAT_ELF_PLATFORM (NULL) 78 79 #ifdef CONFIG_MMU 80 #define ARCH_DLINFO \ 81 do { \ 82 /* \ 83 * Note that we add ulong after elf_addr_t because \ 84 * casting current->mm->context.vdso triggers a cast \ 85 * warning of cast from pointer to integer for \ 86 * COMPAT ELFCLASS32. \ 87 */ \ 88 NEW_AUX_ENT(AT_SYSINFO_EHDR, \ 89 (elf_addr_t)(ulong)current->mm->context.vdso); \ 90 NEW_AUX_ENT(AT_L1I_CACHESIZE, \ 91 get_cache_size(1, CACHE_TYPE_INST)); \ 92 NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, \ 93 get_cache_geometry(1, CACHE_TYPE_INST)); \ 94 NEW_AUX_ENT(AT_L1D_CACHESIZE, \ 95 get_cache_size(1, CACHE_TYPE_DATA)); \ 96 NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY, \ 97 get_cache_geometry(1, CACHE_TYPE_DATA)); \ 98 NEW_AUX_ENT(AT_L2_CACHESIZE, \ 99 get_cache_size(2, CACHE_TYPE_UNIFIED)); \ 100 NEW_AUX_ENT(AT_L2_CACHEGEOMETRY, \ 101 get_cache_geometry(2, CACHE_TYPE_UNIFIED)); \ 102 } while (0) 103 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 104 struct linux_binprm; 105 extern int arch_setup_additional_pages(struct linux_binprm *bprm, 106 int uses_interp); 107 #endif /* CONFIG_MMU */ 108 109 #define ELF_CORE_COPY_REGS(dest, regs) \ 110 do { \ 111 *(struct user_regs_struct *)&(dest) = \ 112 *(struct user_regs_struct *)regs; \ 113 } while (0); 114 115 #ifdef CONFIG_COMPAT 116 117 #define SET_PERSONALITY(ex) \ 118 do { if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \ 119 set_thread_flag(TIF_32BIT); \ 120 else \ 121 clear_thread_flag(TIF_32BIT); \ 122 if (personality(current->personality) != PER_LINUX32) \ 123 set_personality(PER_LINUX | \ 124 (current->personality & (~PER_MASK))); \ 125 } while (0) 126 127 #define COMPAT_ELF_ET_DYN_BASE ((TASK_SIZE_32 / 3) * 2) 128 129 /* rv32 registers */ 130 typedef compat_ulong_t compat_elf_greg_t; 131 typedef compat_elf_greg_t compat_elf_gregset_t[ELF_NGREG]; 132 133 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, 134 int uses_interp); 135 #define compat_arch_setup_additional_pages \ 136 compat_arch_setup_additional_pages 137 138 #endif /* CONFIG_COMPAT */ 139 #endif /* _ASM_RISCV_ELF_H */ 140