Merge tag 'x86-urgent-2024-03-24' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / arch / riscv / include / asm / elf.h
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 #include <asm/cpufeature.h>
18
19 /*
20  * These are used to set parameters in the core dumps.
21  */
22 #define ELF_ARCH        EM_RISCV
23
24 #ifndef ELF_CLASS
25 #ifdef CONFIG_64BIT
26 #define ELF_CLASS       ELFCLASS64
27 #else
28 #define ELF_CLASS       ELFCLASS32
29 #endif
30 #endif
31
32 #define ELF_DATA        ELFDATA2LSB
33
34 /*
35  * This is used to ensure we don't load something for the wrong architecture.
36  */
37 #define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
38                            ((x)->e_ident[EI_CLASS] == ELF_CLASS))
39
40 extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
41 #define compat_elf_check_arch   compat_elf_check_arch
42
43 #define CORE_DUMP_USE_REGSET
44 #define ELF_FDPIC_CORE_EFLAGS   0
45 #define ELF_EXEC_PAGESIZE       (PAGE_SIZE)
46
47 /*
48  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
49  * use of this is to invoke "./ld.so someprog" to test out a new version of
50  * the loader.  We need to make sure that it is out of the way of the program
51  * that it will "exec", and that there is sufficient room for the brk.
52  */
53 #define ELF_ET_DYN_BASE         ((DEFAULT_MAP_WINDOW / 3) * 2)
54
55 #ifdef CONFIG_64BIT
56 #define STACK_RND_MASK          (is_compat_task() ? \
57                                  0x7ff >> (PAGE_SHIFT - 12) : \
58                                  0x3ffff >> (PAGE_SHIFT - 12))
59 #endif
60
61 /*
62  * Provides information on the availiable set of ISA extensions to userspace,
63  * via a bitmap that coorespends to each single-letter ISA extension.  This is
64  * essentially defunct, but will remain for compatibility with userspace.
65  */
66 #define ELF_HWCAP       riscv_get_elf_hwcap()
67 extern unsigned long elf_hwcap;
68
69 #define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
70         do { \
71                 (_r)->a1 = _exec_map_addr; \
72                 (_r)->a2 = _interp_map_addr; \
73                 (_r)->a3 = dynamic_addr; \
74         } while (0)
75
76 /*
77  * This yields a string that ld.so will use to load implementation
78  * specific libraries for optimization.  This is more specific in
79  * intent than poking at uname or /proc/cpuinfo.
80  */
81 #define ELF_PLATFORM    (NULL)
82
83 #define COMPAT_ELF_PLATFORM     (NULL)
84
85 #define ARCH_DLINFO                                             \
86 do {                                                            \
87         /*                                                      \
88          * Note that we add ulong after elf_addr_t because      \
89          * casting current->mm->context.vdso triggers a cast    \
90          * warning of cast from pointer to integer for          \
91          * COMPAT ELFCLASS32.                                   \
92          */                                                     \
93         NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
94                 (elf_addr_t)(ulong)current->mm->context.vdso);  \
95         NEW_AUX_ENT(AT_L1I_CACHESIZE,                           \
96                 get_cache_size(1, CACHE_TYPE_INST));            \
97         NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,                       \
98                 get_cache_geometry(1, CACHE_TYPE_INST));        \
99         NEW_AUX_ENT(AT_L1D_CACHESIZE,                           \
100                 get_cache_size(1, CACHE_TYPE_DATA));            \
101         NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,                       \
102                 get_cache_geometry(1, CACHE_TYPE_DATA));        \
103         NEW_AUX_ENT(AT_L2_CACHESIZE,                            \
104                 get_cache_size(2, CACHE_TYPE_UNIFIED));         \
105         NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,                        \
106                 get_cache_geometry(2, CACHE_TYPE_UNIFIED));     \
107         NEW_AUX_ENT(AT_L3_CACHESIZE,                            \
108                 get_cache_size(3, CACHE_TYPE_UNIFIED));         \
109         NEW_AUX_ENT(AT_L3_CACHEGEOMETRY,                        \
110                 get_cache_geometry(3, CACHE_TYPE_UNIFIED));     \
111         /*                                                       \
112          * Should always be nonzero unless there's a kernel bug. \
113          * If we haven't determined a sensible value to give to  \
114          * userspace, omit the entry:                            \
115          */                                                      \
116         if (likely(signal_minsigstksz))                          \
117                 NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
118         else                                                     \
119                 NEW_AUX_ENT(AT_IGNORE, 0);                       \
120 } while (0)
121
122 #ifdef CONFIG_MMU
123 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
124 struct linux_binprm;
125 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
126         int uses_interp);
127 #endif /* CONFIG_MMU */
128
129 #define ELF_CORE_COPY_REGS(dest, regs)                  \
130 do {                                                    \
131         *(struct user_regs_struct *)&(dest) =           \
132                 *(struct user_regs_struct *)regs;       \
133 } while (0);
134
135 #ifdef CONFIG_COMPAT
136
137 #define SET_PERSONALITY(ex)                                     \
138 do {    set_compat_task((ex).e_ident[EI_CLASS] == ELFCLASS32);  \
139         if (personality(current->personality) != PER_LINUX32)   \
140                 set_personality(PER_LINUX |                     \
141                         (current->personality & (~PER_MASK)));  \
142 } while (0)
143
144 #define COMPAT_ELF_ET_DYN_BASE          ((TASK_SIZE_32 / 3) * 2)
145
146 /* rv32 registers */
147 typedef compat_ulong_t                  compat_elf_greg_t;
148 typedef compat_elf_greg_t               compat_elf_gregset_t[ELF_NGREG];
149
150 extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
151                                               int uses_interp);
152 #define compat_arch_setup_additional_pages \
153                                 compat_arch_setup_additional_pages
154
155 #endif /* CONFIG_COMPAT */
156 #endif /* _ASM_RISCV_ELF_H */