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/asm/elf.h>
12 #include <asm/auxvec.h>
13 #include <asm/byteorder.h>
14 #include <asm/cacheinfo.h>
15 
16 /*
17  * These are used to set parameters in the core dumps.
18  */
19 #define ELF_ARCH	EM_RISCV
20 
21 #ifdef CONFIG_64BIT
22 #define ELF_CLASS	ELFCLASS64
23 #else
24 #define ELF_CLASS	ELFCLASS32
25 #endif
26 
27 #define ELF_DATA	ELFDATA2LSB
28 
29 /*
30  * This is used to ensure we don't load something for the wrong architecture.
31  */
32 #define elf_check_arch(x) ((x)->e_machine == EM_RISCV)
33 
34 #define CORE_DUMP_USE_REGSET
35 #define ELF_EXEC_PAGESIZE	(PAGE_SIZE)
36 
37 /*
38  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
39  * use of this is to invoke "./ld.so someprog" to test out a new version of
40  * the loader.  We need to make sure that it is out of the way of the program
41  * that it will "exec", and that there is sufficient room for the brk.
42  */
43 #define ELF_ET_DYN_BASE		((TASK_SIZE / 3) * 2)
44 
45 #ifdef CONFIG_64BIT
46 #define STACK_RND_MASK		(0x3ffff >> (PAGE_SHIFT - 12))
47 #endif
48 /*
49  * This yields a mask that user programs can use to figure out what
50  * instruction set this CPU supports.  This could be done in user space,
51  * but it's not easy, and we've already done it here.
52  */
53 #define ELF_HWCAP	(elf_hwcap)
54 extern unsigned long elf_hwcap;
55 
56 /*
57  * This yields a string that ld.so will use to load implementation
58  * specific libraries for optimization.  This is more specific in
59  * intent than poking at uname or /proc/cpuinfo.
60  */
61 #define ELF_PLATFORM	(NULL)
62 
63 #ifdef CONFIG_MMU
64 #define ARCH_DLINFO						\
65 do {								\
66 	NEW_AUX_ENT(AT_SYSINFO_EHDR,				\
67 		(elf_addr_t)current->mm->context.vdso);		\
68 	NEW_AUX_ENT(AT_L1I_CACHESIZE,				\
69 		get_cache_size(1, CACHE_TYPE_INST));		\
70 	NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,			\
71 		get_cache_geometry(1, CACHE_TYPE_INST));	\
72 	NEW_AUX_ENT(AT_L1D_CACHESIZE,				\
73 		get_cache_size(1, CACHE_TYPE_DATA));		\
74 	NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,			\
75 		get_cache_geometry(1, CACHE_TYPE_DATA));	\
76 	NEW_AUX_ENT(AT_L2_CACHESIZE,				\
77 		get_cache_size(2, CACHE_TYPE_UNIFIED));		\
78 	NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,			\
79 		get_cache_geometry(2, CACHE_TYPE_UNIFIED));	\
80 } while (0)
81 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
82 struct linux_binprm;
83 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
84 	int uses_interp);
85 #endif /* CONFIG_MMU */
86 
87 #define ELF_CORE_COPY_REGS(dest, regs)			\
88 do {							\
89 	*(struct user_regs_struct *)&(dest) =		\
90 		*(struct user_regs_struct *)regs;	\
91 } while (0);
92 
93 #endif /* _ASM_RISCV_ELF_H */
94