summaryrefslogtreecommitdiff
path: root/arch/xtensa/include/asm/elf.h
blob: ffcf1ada19c6623d772a815ab673846a57c1eeb7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
/*
 * include/asm-xtensa/elf.h
 *
 * ELF register definitions
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_ELF_H
#define _XTENSA_ELF_H

#include <asm/ptrace.h>
#include <asm/coprocessor.h>
#include <linux/elf-em.h>

/* Xtensa processor ELF architecture-magic number */

#define EM_XTENSA_OLD	0xABC7

/* Xtensa relocations defined by the ABIs */

#define R_XTENSA_NONE           0
#define R_XTENSA_32             1
#define R_XTENSA_RTLD           2
#define R_XTENSA_GLOB_DAT       3
#define R_XTENSA_JMP_SLOT       4
#define R_XTENSA_RELATIVE       5
#define R_XTENSA_PLT            6
#define R_XTENSA_OP0            8
#define R_XTENSA_OP1            9
#define R_XTENSA_OP2            10
#define R_XTENSA_ASM_EXPAND	11
#define R_XTENSA_ASM_SIMPLIFY	12
#define R_XTENSA_GNU_VTINHERIT	15
#define R_XTENSA_GNU_VTENTRY	16
#define R_XTENSA_DIFF8		17
#define R_XTENSA_DIFF16		18
#define R_XTENSA_DIFF32		19
#define R_XTENSA_SLOT0_OP	20
#define R_XTENSA_SLOT1_OP	21
#define R_XTENSA_SLOT2_OP	22
#define R_XTENSA_SLOT3_OP	23
#define R_XTENSA_SLOT4_OP	24
#define R_XTENSA_SLOT5_OP	25
#define R_XTENSA_SLOT6_OP	26
#define R_XTENSA_SLOT7_OP	27
#define R_XTENSA_SLOT8_OP	28
#define R_XTENSA_SLOT9_OP	29
#define R_XTENSA_SLOT10_OP	30
#define R_XTENSA_SLOT11_OP	31
#define R_XTENSA_SLOT12_OP	32
#define R_XTENSA_SLOT13_OP	33
#define R_XTENSA_SLOT14_OP	34
#define R_XTENSA_SLOT0_ALT	35
#define R_XTENSA_SLOT1_ALT	36
#define R_XTENSA_SLOT2_ALT	37
#define R_XTENSA_SLOT3_ALT	38
#define R_XTENSA_SLOT4_ALT	39
#define R_XTENSA_SLOT5_ALT	40
#define R_XTENSA_SLOT6_ALT	41
#define R_XTENSA_SLOT7_ALT	42
#define R_XTENSA_SLOT8_ALT	43
#define R_XTENSA_SLOT9_ALT	44
#define R_XTENSA_SLOT10_ALT	45
#define R_XTENSA_SLOT11_ALT	46
#define R_XTENSA_SLOT12_ALT	47
#define R_XTENSA_SLOT13_ALT	48
#define R_XTENSA_SLOT14_ALT	49

/* ELF register definitions. This is needed for core dump support.  */

typedef unsigned long elf_greg_t;

typedef struct user_pt_regs xtensa_gregset_t;

#define ELF_NGREG	(sizeof(xtensa_gregset_t) / sizeof(elf_greg_t))

typedef elf_greg_t elf_gregset_t[ELF_NGREG];

#define ELF_NFPREG	18

typedef unsigned int elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */

#define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA )  || \
			    ( (x)->e_machine == EM_XTENSA_OLD ) )

#define ELFOSABI_XTENSA_FDPIC 65
#define elf_check_fdpic(x) ((x)->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC)
#define ELF_FDPIC_CORE_EFLAGS 0

/*
 * These are used to set parameters in the core dumps.
 */

#ifdef __XTENSA_EL__
# define ELF_DATA	ELFDATA2LSB
#elif defined(__XTENSA_EB__)
# define ELF_DATA	ELFDATA2MSB
#else
# error processor byte order undefined!
#endif

#define ELF_CLASS	ELFCLASS32
#define ELF_ARCH	EM_XTENSA

#define ELF_EXEC_PAGESIZE	PAGE_SIZE
#define CORE_DUMP_USE_REGSET

/*
 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 * use of this is to invoke "./ld.so someprog" to test out a new version of
 * the loader.  We need to make sure that it is out of the way of the program
 * that it will "exec", and that there is sufficient room for the brk.
 */

#define ELF_ET_DYN_BASE         (2 * TASK_SIZE / 3)

/*
 * This yields a mask that user programs can use to figure out what
 * instruction set this CPU supports.  This could be done in user space,
 * but it's not easy, and we've already done it here.
 */

#define ELF_HWCAP	(0)

/*
 * This yields a string that ld.so will use to load implementation
 * specific libraries for optimization.  This is more specific in
 * intent than poking at uname or /proc/cpuinfo.
 * For the moment, we have only optimizations for the Intel generations,
 * but that could change...
 */

#define ELF_PLATFORM  (NULL)

/*
 * The Xtensa processor ABI says that when the program starts, a2
 * contains a pointer to a function which might be registered using
 * `atexit'.  This provides a mean for the dynamic linker to call
 * DT_FINI functions for shared libraries that have been loaded before
 * the code runs.
 *
 * A value of 0 tells we have no such handler.
 *
 * We might as well make sure everything else is cleared too (except
 * for the stack pointer in a1), just to make things more
 * deterministic.  Also, clearing a0 terminates debugger backtraces.
 */

#define ELF_PLAT_INIT(_r, load_addr) \
	do { \
		(_r)->areg[0]  = 0; /*(_r)->areg[1] = 0;*/ \
		(_r)->areg[2]  = 0; (_r)->areg[3]  = 0; \
		(_r)->areg[4]  = 0; (_r)->areg[5]  = 0; \
		(_r)->areg[6]  = 0; (_r)->areg[7]  = 0; \
		(_r)->areg[8]  = 0; (_r)->areg[9]  = 0; \
		(_r)->areg[10] = 0; (_r)->areg[11] = 0; \
		(_r)->areg[12] = 0; (_r)->areg[13] = 0; \
		(_r)->areg[14] = 0; (_r)->areg[15] = 0; \
	} while (0)

#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
	do { \
		(_r)->areg[4] = _exec_map_addr; \
		(_r)->areg[5] = _interp_map_addr; \
		(_r)->areg[6] = dynamic_addr; \
	} while (0)

typedef struct {
	xtregs_opt_t	opt;
	xtregs_user_t	user;
#if XTENSA_HAVE_COPROCESSORS
	xtregs_cp0_t	cp0;
	xtregs_cp1_t	cp1;
	xtregs_cp2_t	cp2;
	xtregs_cp3_t	cp3;
	xtregs_cp4_t	cp4;
	xtregs_cp5_t	cp5;
	xtregs_cp6_t	cp6;
	xtregs_cp7_t	cp7;
#endif
} elf_xtregs_t;

#define SET_PERSONALITY(ex) \
	set_personality(PER_LINUX_32BIT | (current->personality & (~PER_MASK)))

#endif	/* _XTENSA_ELF_H */