xref: /openbmc/linux/arch/xtensa/include/asm/elf.h (revision e3ddb8bb)
1 /*
2  * include/asm-xtensa/elf.h
3  *
4  * ELF register definitions
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License.  See the file "COPYING" in the main directory of this archive
8  * for more details.
9  *
10  * Copyright (C) 2001 - 2005 Tensilica Inc.
11  */
12 
13 #ifndef _XTENSA_ELF_H
14 #define _XTENSA_ELF_H
15 
16 #include <asm/ptrace.h>
17 #include <asm/coprocessor.h>
18 #include <linux/elf-em.h>
19 
20 /* Xtensa processor ELF architecture-magic number */
21 
22 #define EM_XTENSA_OLD	0xABC7
23 
24 /* Xtensa relocations defined by the ABIs */
25 
26 #define R_XTENSA_NONE           0
27 #define R_XTENSA_32             1
28 #define R_XTENSA_RTLD           2
29 #define R_XTENSA_GLOB_DAT       3
30 #define R_XTENSA_JMP_SLOT       4
31 #define R_XTENSA_RELATIVE       5
32 #define R_XTENSA_PLT            6
33 #define R_XTENSA_OP0            8
34 #define R_XTENSA_OP1            9
35 #define R_XTENSA_OP2            10
36 #define R_XTENSA_ASM_EXPAND	11
37 #define R_XTENSA_ASM_SIMPLIFY	12
38 #define R_XTENSA_GNU_VTINHERIT	15
39 #define R_XTENSA_GNU_VTENTRY	16
40 #define R_XTENSA_DIFF8		17
41 #define R_XTENSA_DIFF16		18
42 #define R_XTENSA_DIFF32		19
43 #define R_XTENSA_SLOT0_OP	20
44 #define R_XTENSA_SLOT1_OP	21
45 #define R_XTENSA_SLOT2_OP	22
46 #define R_XTENSA_SLOT3_OP	23
47 #define R_XTENSA_SLOT4_OP	24
48 #define R_XTENSA_SLOT5_OP	25
49 #define R_XTENSA_SLOT6_OP	26
50 #define R_XTENSA_SLOT7_OP	27
51 #define R_XTENSA_SLOT8_OP	28
52 #define R_XTENSA_SLOT9_OP	29
53 #define R_XTENSA_SLOT10_OP	30
54 #define R_XTENSA_SLOT11_OP	31
55 #define R_XTENSA_SLOT12_OP	32
56 #define R_XTENSA_SLOT13_OP	33
57 #define R_XTENSA_SLOT14_OP	34
58 #define R_XTENSA_SLOT0_ALT	35
59 #define R_XTENSA_SLOT1_ALT	36
60 #define R_XTENSA_SLOT2_ALT	37
61 #define R_XTENSA_SLOT3_ALT	38
62 #define R_XTENSA_SLOT4_ALT	39
63 #define R_XTENSA_SLOT5_ALT	40
64 #define R_XTENSA_SLOT6_ALT	41
65 #define R_XTENSA_SLOT7_ALT	42
66 #define R_XTENSA_SLOT8_ALT	43
67 #define R_XTENSA_SLOT9_ALT	44
68 #define R_XTENSA_SLOT10_ALT	45
69 #define R_XTENSA_SLOT11_ALT	46
70 #define R_XTENSA_SLOT12_ALT	47
71 #define R_XTENSA_SLOT13_ALT	48
72 #define R_XTENSA_SLOT14_ALT	49
73 
74 /* ELF register definitions. This is needed for core dump support.  */
75 
76 typedef unsigned long elf_greg_t;
77 
78 typedef struct user_pt_regs xtensa_gregset_t;
79 
80 #define ELF_NGREG	(sizeof(xtensa_gregset_t) / sizeof(elf_greg_t))
81 
82 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
83 
84 #define ELF_NFPREG	18
85 
86 typedef unsigned int elf_fpreg_t;
87 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
88 
89 /*
90  * This is used to ensure we don't load something for the wrong architecture.
91  */
92 
93 #define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA )  || \
94 			    ( (x)->e_machine == EM_XTENSA_OLD ) )
95 
96 #define ELFOSABI_XTENSA_FDPIC 65
97 #define elf_check_fdpic(x) ((x)->e_ident[EI_OSABI] == ELFOSABI_XTENSA_FDPIC)
98 #define ELF_FDPIC_CORE_EFLAGS 0
99 
100 /*
101  * These are used to set parameters in the core dumps.
102  */
103 
104 #ifdef __XTENSA_EL__
105 # define ELF_DATA	ELFDATA2LSB
106 #elif defined(__XTENSA_EB__)
107 # define ELF_DATA	ELFDATA2MSB
108 #else
109 # error processor byte order undefined!
110 #endif
111 
112 #define ELF_CLASS	ELFCLASS32
113 #define ELF_ARCH	EM_XTENSA
114 
115 #define ELF_EXEC_PAGESIZE	PAGE_SIZE
116 #define CORE_DUMP_USE_REGSET
117 
118 /*
119  * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
120  * use of this is to invoke "./ld.so someprog" to test out a new version of
121  * the loader.  We need to make sure that it is out of the way of the program
122  * that it will "exec", and that there is sufficient room for the brk.
123  */
124 
125 #define ELF_ET_DYN_BASE         (2 * TASK_SIZE / 3)
126 
127 /*
128  * This yields a mask that user programs can use to figure out what
129  * instruction set this CPU supports.  This could be done in user space,
130  * but it's not easy, and we've already done it here.
131  */
132 
133 #define ELF_HWCAP	(0)
134 
135 /*
136  * This yields a string that ld.so will use to load implementation
137  * specific libraries for optimization.  This is more specific in
138  * intent than poking at uname or /proc/cpuinfo.
139  * For the moment, we have only optimizations for the Intel generations,
140  * but that could change...
141  */
142 
143 #define ELF_PLATFORM  (NULL)
144 
145 /*
146  * The Xtensa processor ABI says that when the program starts, a2
147  * contains a pointer to a function which might be registered using
148  * `atexit'.  This provides a mean for the dynamic linker to call
149  * DT_FINI functions for shared libraries that have been loaded before
150  * the code runs.
151  *
152  * A value of 0 tells we have no such handler.
153  *
154  * We might as well make sure everything else is cleared too (except
155  * for the stack pointer in a1), just to make things more
156  * deterministic.  Also, clearing a0 terminates debugger backtraces.
157  */
158 
159 #define ELF_PLAT_INIT(_r, load_addr) \
160 	do { \
161 		(_r)->areg[0]  = 0; /*(_r)->areg[1] = 0;*/ \
162 		(_r)->areg[2]  = 0; (_r)->areg[3]  = 0; \
163 		(_r)->areg[4]  = 0; (_r)->areg[5]  = 0; \
164 		(_r)->areg[6]  = 0; (_r)->areg[7]  = 0; \
165 		(_r)->areg[8]  = 0; (_r)->areg[9]  = 0; \
166 		(_r)->areg[10] = 0; (_r)->areg[11] = 0; \
167 		(_r)->areg[12] = 0; (_r)->areg[13] = 0; \
168 		(_r)->areg[14] = 0; (_r)->areg[15] = 0; \
169 	} while (0)
170 
171 #define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
172 	do { \
173 		(_r)->areg[4] = _exec_map_addr; \
174 		(_r)->areg[5] = _interp_map_addr; \
175 		(_r)->areg[6] = dynamic_addr; \
176 	} while (0)
177 
178 typedef struct {
179 	xtregs_opt_t	opt;
180 	xtregs_user_t	user;
181 #if XTENSA_HAVE_COPROCESSORS
182 	xtregs_cp0_t	cp0;
183 	xtregs_cp1_t	cp1;
184 	xtregs_cp2_t	cp2;
185 	xtregs_cp3_t	cp3;
186 	xtregs_cp4_t	cp4;
187 	xtregs_cp5_t	cp5;
188 	xtregs_cp6_t	cp6;
189 	xtregs_cp7_t	cp7;
190 #endif
191 } elf_xtregs_t;
192 
193 #define SET_PERSONALITY(ex) \
194 	set_personality(PER_LINUX_32BIT | (current->personality & (~PER_MASK)))
195 
196 #endif	/* _XTENSA_ELF_H */
197