Linux kernel mirror (for testing)
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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#ifdef __BIG_ENDIAN__
48#define ELF_DATA ELFDATA2MSB
49#else
50#define ELF_DATA ELFDATA2LSB
51#endif
52
53/*
54 * There seems to be a bug in how compat_binfmt_elf.c works: it
55 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
56 * Hack around this by providing an enum value of ELF_ARCH.
57 */
58enum { ELF_ARCH = CHIP_ELF_TYPE() };
59#define ELF_ARCH ELF_ARCH
60
61/*
62 * This is used to ensure we don't load something for the wrong architecture.
63 */
64#define elf_check_arch(x) \
65 ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
66 (x)->e_ident[EI_DATA] == ELF_DATA && \
67 (x)->e_machine == CHIP_ELF_TYPE())
68
69/* The module loader only handles a few relocation types. */
70#ifndef __tilegx__
71#define R_TILE_32 1
72#define R_TILE_JOFFLONG_X1 15
73#define R_TILE_IMM16_X0_LO 25
74#define R_TILE_IMM16_X1_LO 26
75#define R_TILE_IMM16_X0_HA 29
76#define R_TILE_IMM16_X1_HA 30
77#else
78#define R_TILEGX_64 1
79#define R_TILEGX_JUMPOFF_X1 21
80#define R_TILEGX_IMM16_X0_HW0 36
81#define R_TILEGX_IMM16_X1_HW0 37
82#define R_TILEGX_IMM16_X0_HW1 38
83#define R_TILEGX_IMM16_X1_HW1 39
84#define R_TILEGX_IMM16_X0_HW2_LAST 48
85#define R_TILEGX_IMM16_X1_HW2_LAST 49
86#endif
87
88/* Use standard page size for core dumps. */
89#define ELF_EXEC_PAGESIZE PAGE_SIZE
90
91/*
92 * This is the location that an ET_DYN program is loaded if exec'ed. Typical
93 * use of this is to invoke "./ld.so someprog" to test out a new version of
94 * the loader. We need to make sure that it is out of the way of the program
95 * that it will "exec", and that there is sufficient room for the brk.
96 */
97#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
98
99#define ELF_CORE_COPY_REGS(_dest, _regs) \
100 memcpy((char *) &_dest, (char *) _regs, \
101 sizeof(struct pt_regs));
102
103/* No additional FP registers to copy. */
104#define ELF_CORE_COPY_FPREGS(t, fpu) 0
105
106/*
107 * This yields a mask that user programs can use to figure out what
108 * instruction set this CPU supports. This could be done in user space,
109 * but it's not easy, and we've already done it here.
110 */
111#define ELF_HWCAP (0)
112
113/*
114 * This yields a string that ld.so will use to load implementation
115 * specific libraries for optimization. This is more specific in
116 * intent than poking at uname or /proc/cpuinfo.
117 */
118#define ELF_PLATFORM (NULL)
119
120extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
121
122#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
123
124extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
125#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
126
127/* Tilera Linux has no personalities currently, so no need to do anything. */
128#define SET_PERSONALITY(ex) do { } while (0)
129
130#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
131/* Support auto-mapping of the user interrupt vectors. */
132struct linux_binprm;
133extern int arch_setup_additional_pages(struct linux_binprm *bprm,
134 int executable_stack);
135#ifdef CONFIG_COMPAT
136
137#define COMPAT_ELF_PLATFORM "tilegx-m32"
138
139/*
140 * "Compat" binaries have the same machine type, but 32-bit class,
141 * since they're not a separate machine type, but just a 32-bit
142 * variant of the standard 64-bit architecture.
143 */
144#define compat_elf_check_arch(x) \
145 ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
146 (x)->e_machine == CHIP_ELF_TYPE())
147
148#define compat_start_thread(regs, ip, usp) do { \
149 regs->pc = ptr_to_compat_reg((void *)(ip)); \
150 regs->sp = ptr_to_compat_reg((void *)(usp)); \
151 } while (0)
152
153/*
154 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
155 */
156#undef SET_PERSONALITY
157#define SET_PERSONALITY(ex) \
158do { \
159 current->personality = PER_LINUX; \
160 current_thread_info()->status &= ~TS_COMPAT; \
161} while (0)
162#define COMPAT_SET_PERSONALITY(ex) \
163do { \
164 current->personality = PER_LINUX_32BIT; \
165 current_thread_info()->status |= TS_COMPAT; \
166} while (0)
167
168#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
169
170#endif /* CONFIG_COMPAT */
171
172#endif /* _ASM_TILE_ELF_H */