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_TILEPRO 188
34#define EM_TILEGX  191
35
36/* Provide a nominal data structure. */
37#define ELF_NFPREG	0
38typedef double elf_fpreg_t;
39typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
40
41#ifdef __tilegx__
42#define ELF_CLASS	ELFCLASS64
43#else
44#define ELF_CLASS	ELFCLASS32
45#endif
46#ifdef __BIG_ENDIAN__
47#define ELF_DATA	ELFDATA2MSB
48#else
49#define ELF_DATA	ELFDATA2LSB
50#endif
51
52/*
53 * There seems to be a bug in how compat_binfmt_elf.c works: it
54 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
55 * Hack around this by providing an enum value of ELF_ARCH.
56 */
57enum { ELF_ARCH = CHIP_ELF_TYPE() };
58#define ELF_ARCH ELF_ARCH
59
60/*
61 * This is used to ensure we don't load something for the wrong architecture.
62 */
63#define elf_check_arch(x)  \
64	((x)->e_ident[EI_CLASS] == ELF_CLASS && \
65	 (x)->e_ident[EI_DATA] == ELF_DATA && \
66	 (x)->e_machine == CHIP_ELF_TYPE())
67
68/* The module loader only handles a few relocation types. */
69#ifndef __tilegx__
70#define R_TILE_32                 1
71#define R_TILE_JOFFLONG_X1       15
72#define R_TILE_IMM16_X0_LO       25
73#define R_TILE_IMM16_X1_LO       26
74#define R_TILE_IMM16_X0_HA       29
75#define R_TILE_IMM16_X1_HA       30
76#else
77#define R_TILEGX_64                       1
78#define R_TILEGX_JUMPOFF_X1              21
79#define R_TILEGX_IMM16_X0_HW0            36
80#define R_TILEGX_IMM16_X1_HW0            37
81#define R_TILEGX_IMM16_X0_HW1            38
82#define R_TILEGX_IMM16_X1_HW1            39
83#define R_TILEGX_IMM16_X0_HW2_LAST       48
84#define R_TILEGX_IMM16_X1_HW2_LAST       49
85#endif
86
87/* Use standard page size for core dumps. */
88#define ELF_EXEC_PAGESIZE	PAGE_SIZE
89
90/*
91 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
92 * use of this is to invoke "./ld.so someprog" to test out a new version of
93 * the loader.  We need to make sure that it is out of the way of the program
94 * that it will "exec", and that there is sufficient room for the brk.
95 */
96#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
97
98#define ELF_CORE_COPY_REGS(_dest, _regs)			\
99	memcpy((char *) &_dest, (char *) _regs,			\
100	       sizeof(struct pt_regs));
101
102/* No additional FP registers to copy. */
103#define ELF_CORE_COPY_FPREGS(t, fpu) 0
104
105/*
106 * This yields a mask that user programs can use to figure out what
107 * instruction set this CPU supports.  This could be done in user space,
108 * but it's not easy, and we've already done it here.
109 */
110#define ELF_HWCAP	(0)
111
112/*
113 * This yields a string that ld.so will use to load implementation
114 * specific libraries for optimization.  This is more specific in
115 * intent than poking at uname or /proc/cpuinfo.
116 */
117#define ELF_PLATFORM  (NULL)
118
119extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
120
121#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
122
123extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
124#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
125
126/* Tilera Linux has no personalities currently, so no need to do anything. */
127#define SET_PERSONALITY(ex) do { } while (0)
128
129#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
130/* Support auto-mapping of the user interrupt vectors. */
131struct linux_binprm;
132extern int arch_setup_additional_pages(struct linux_binprm *bprm,
133				       int executable_stack);
134#define ARCH_DLINFO \
135do { \
136	NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
137} while (0)
138
139struct mm_struct;
140extern unsigned long arch_randomize_brk(struct mm_struct *mm);
141#define arch_randomize_brk arch_randomize_brk
142
143#ifdef CONFIG_COMPAT
144
145#define COMPAT_ELF_PLATFORM "tilegx-m32"
146
147/*
148 * "Compat" binaries have the same machine type, but 32-bit class,
149 * since they're not a separate machine type, but just a 32-bit
150 * variant of the standard 64-bit architecture.
151 */
152#define compat_elf_check_arch(x)  \
153	((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
154	 (x)->e_machine == CHIP_ELF_TYPE())
155
156#define compat_start_thread(regs, ip, usp) do { \
157		regs->pc = ptr_to_compat_reg((void *)(ip)); \
158		regs->sp = ptr_to_compat_reg((void *)(usp)); \
159		single_step_execve();	\
160	} while (0)
161
162/*
163 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
164 */
165#undef SET_PERSONALITY
166#define SET_PERSONALITY(ex) \
167do { \
168	set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
169	current_thread_info()->status &= ~TS_COMPAT; \
170} while (0)
171#define COMPAT_SET_PERSONALITY(ex) \
172do { \
173	set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
174	current_thread_info()->status |= TS_COMPAT; \
175} while (0)
176
177#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
178
179#endif /* CONFIG_COMPAT */
180
181#define CORE_DUMP_USE_REGSET
182
183#endif /* _ASM_TILE_ELF_H */
184