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Linux kernel mirror (for testing)
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linux
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 <linux/elf-em.h>
26#include <asm/byteorder.h>
27#include <asm/page.h>
28
29typedef unsigned long elf_greg_t;
30
31#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
32typedef elf_greg_t elf_gregset_t[ELF_NGREG];
33
34/* Provide a nominal data structure. */
35#define ELF_NFPREG 0
36typedef double elf_fpreg_t;
37typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
38
39#ifdef __tilegx__
40#define ELF_CLASS ELFCLASS64
41#else
42#define ELF_CLASS ELFCLASS32
43#endif
44#ifdef __BIG_ENDIAN__
45#define ELF_DATA ELFDATA2MSB
46#else
47#define ELF_DATA ELFDATA2LSB
48#endif
49
50/*
51 * There seems to be a bug in how compat_binfmt_elf.c works: it
52 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
53 * Hack around this by providing an enum value of ELF_ARCH.
54 */
55enum { ELF_ARCH = CHIP_ELF_TYPE() };
56#define ELF_ARCH ELF_ARCH
57
58/*
59 * This is used to ensure we don't load something for the wrong architecture.
60 */
61#define elf_check_arch(x) \
62 ((x)->e_ident[EI_CLASS] == ELF_CLASS && \
63 (x)->e_ident[EI_DATA] == ELF_DATA && \
64 (x)->e_machine == CHIP_ELF_TYPE())
65
66/* The module loader only handles a few relocation types. */
67#ifndef __tilegx__
68#define R_TILE_32 1
69#define R_TILE_JOFFLONG_X1 15
70#define R_TILE_IMM16_X0_LO 25
71#define R_TILE_IMM16_X1_LO 26
72#define R_TILE_IMM16_X0_HA 29
73#define R_TILE_IMM16_X1_HA 30
74#else
75#define R_TILEGX_64 1
76#define R_TILEGX_JUMPOFF_X1 21
77#define R_TILEGX_IMM16_X0_HW0 36
78#define R_TILEGX_IMM16_X1_HW0 37
79#define R_TILEGX_IMM16_X0_HW1 38
80#define R_TILEGX_IMM16_X1_HW1 39
81#define R_TILEGX_IMM16_X0_HW2_LAST 48
82#define R_TILEGX_IMM16_X1_HW2_LAST 49
83#endif
84
85/* Use standard page size for core dumps. */
86#define ELF_EXEC_PAGESIZE PAGE_SIZE
87
88/*
89 * This is the location that an ET_DYN program is loaded if exec'ed. Typical
90 * use of this is to invoke "./ld.so someprog" to test out a new version of
91 * the loader. We need to make sure that it is out of the way of the program
92 * that it will "exec", and that there is sufficient room for the brk.
93 */
94#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
95
96#define ELF_CORE_COPY_REGS(_dest, _regs) \
97 memcpy((char *) &_dest, (char *) _regs, \
98 sizeof(struct pt_regs));
99
100/* No additional FP registers to copy. */
101#define ELF_CORE_COPY_FPREGS(t, fpu) 0
102
103/*
104 * This yields a mask that user programs can use to figure out what
105 * instruction set this CPU supports. This could be done in user space,
106 * but it's not easy, and we've already done it here.
107 */
108#define ELF_HWCAP (0)
109
110/*
111 * This yields a string that ld.so will use to load implementation
112 * specific libraries for optimization. This is more specific in
113 * intent than poking at uname or /proc/cpuinfo.
114 */
115#define ELF_PLATFORM (NULL)
116
117extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
118
119#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
120
121extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
122#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
123
124/* Tilera Linux has no personalities currently, so no need to do anything. */
125#define SET_PERSONALITY(ex) do { } while (0)
126
127#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
128/* Support auto-mapping of the user interrupt vectors. */
129struct linux_binprm;
130extern int arch_setup_additional_pages(struct linux_binprm *bprm,
131 int executable_stack);
132#define ARCH_DLINFO \
133do { \
134 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
135} while (0)
136
137struct mm_struct;
138extern unsigned long arch_randomize_brk(struct mm_struct *mm);
139#define arch_randomize_brk arch_randomize_brk
140
141#ifdef CONFIG_COMPAT
142
143#define COMPAT_ELF_PLATFORM "tilegx-m32"
144
145/*
146 * "Compat" binaries have the same machine type, but 32-bit class,
147 * since they're not a separate machine type, but just a 32-bit
148 * variant of the standard 64-bit architecture.
149 */
150#define compat_elf_check_arch(x) \
151 ((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
152 (x)->e_machine == CHIP_ELF_TYPE())
153
154#define compat_start_thread(regs, ip, usp) do { \
155 regs->pc = ptr_to_compat_reg((void *)(ip)); \
156 regs->sp = ptr_to_compat_reg((void *)(usp)); \
157 single_step_execve(); \
158 } while (0)
159
160/*
161 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
162 */
163#undef SET_PERSONALITY
164#define SET_PERSONALITY(ex) \
165do { \
166 set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
167 current_thread_info()->status &= ~TS_COMPAT; \
168} while (0)
169#define COMPAT_SET_PERSONALITY(ex) \
170do { \
171 set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
172 current_thread_info()->status |= TS_COMPAT; \
173} while (0)
174
175#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
176
177#endif /* CONFIG_COMPAT */
178
179#define CORE_DUMP_USE_REGSET
180
181#endif /* _ASM_TILE_ELF_H */