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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
39extern 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)
68extern 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 \
81do { \
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
104struct linux_binprm;
105extern 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) \
110do { \
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) \
118do { 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 */
130typedef compat_ulong_t compat_elf_greg_t;
131typedef compat_elf_greg_t compat_elf_gregset_t[ELF_NGREG];
132
133extern 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 */