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1#ifndef __ASMARM_ELF_H
2#define __ASMARM_ELF_H
3
4#include <linux/config.h>
5
6/*
7 * ELF register definitions..
8 */
9
10#include <asm/ptrace.h>
11#include <asm/user.h>
12#include <asm/procinfo.h>
13
14typedef unsigned long elf_greg_t;
15typedef unsigned long elf_freg_t[3];
16
17#define EM_ARM 40
18#define EF_ARM_APCS26 0x08
19#define EF_ARM_SOFT_FLOAT 0x200
20#define EF_ARM_EABI_MASK 0xFF000000
21
22#define R_ARM_NONE 0
23#define R_ARM_PC24 1
24#define R_ARM_ABS32 2
25
26#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
27typedef elf_greg_t elf_gregset_t[ELF_NGREG];
28
29typedef struct user_fp elf_fpregset_t;
30
31/*
32 * This is used to ensure we don't load something for the wrong architecture.
33 */
34#define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) )
35
36/*
37 * These are used to set parameters in the core dumps.
38 */
39#define ELF_CLASS ELFCLASS32
40#ifdef __ARMEB__
41#define ELF_DATA ELFDATA2MSB;
42#else
43#define ELF_DATA ELFDATA2LSB;
44#endif
45#define ELF_ARCH EM_ARM
46
47#define USE_ELF_CORE_DUMP
48#define ELF_EXEC_PAGESIZE 4096
49
50/* This is the location that an ET_DYN program is loaded if exec'ed. Typical
51 use of this is to invoke "./ld.so someprog" to test out a new version of
52 the loader. We need to make sure that it is out of the way of the program
53 that it will "exec", and that there is sufficient room for the brk. */
54
55#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
56
57/* When the program starts, a1 contains a pointer to a function to be
58 registered with atexit, as per the SVR4 ABI. A value of 0 means we
59 have no such handler. */
60#define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0
61
62/* This yields a mask that user programs can use to figure out what
63 instruction set this cpu supports. */
64
65#define ELF_HWCAP (elf_hwcap)
66
67/* This yields a string that ld.so will use to load implementation
68 specific libraries for optimization. This is more specific in
69 intent than poking at uname or /proc/cpuinfo. */
70
71/* For now we just provide a fairly general string that describes the
72 processor family. This could be made more specific later if someone
73 implemented optimisations that require it. 26-bit CPUs give you
74 "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
75 supported). 32-bit CPUs give you "v3[lb]" for anything based on an
76 ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
77 core. */
78
79#define ELF_PLATFORM_SIZE 8
80extern char elf_platform[];
81#define ELF_PLATFORM (elf_platform)
82
83#ifdef __KERNEL__
84
85/*
86 * 32-bit code is always OK. Some cpus can do 26-bit, some can't.
87 */
88#define ELF_PROC_OK(x) (ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
89
90#define ELF_THUMB_OK(x) \
91 (( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \
92 ((x)->e_entry & 3) == 0)
93
94#define ELF_26BIT_OK(x) \
95 (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
96 ((x)->e_flags & EF_ARM_APCS26) == 0)
97
98#ifndef CONFIG_IWMMXT
99
100/* Old NetWinder binaries were compiled in such a way that the iBCS
101 heuristic always trips on them. Until these binaries become uncommon
102 enough not to care, don't trust the `ibcs' flag here. In any case
103 there is no other ELF system currently supported by iBCS.
104 @@ Could print a warning message to encourage users to upgrade. */
105#define SET_PERSONALITY(ex,ibcs2) \
106 set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
107
108#else
109
110/*
111 * All iWMMXt capable CPUs don't support 26-bit mode. Yet they can run
112 * legacy binaries which used to contain FPA11 floating point instructions
113 * that have always been emulated by the kernel. PFA11 and iWMMXt overlap
114 * on coprocessor 1 space though. We therefore must decide if given task
115 * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
116 * at all times for the prefetch exception handler to catch FPA11 opcodes
117 * and emulate them. The best indication to discriminate those two cases
118 * is the SOFT_FLOAT flag in the ELF header.
119 */
120
121#define SET_PERSONALITY(ex,ibcs2) \
122do { \
123 set_personality(PER_LINUX_32BIT); \
124 if (((ex).e_flags & EF_ARM_EABI_MASK) || \
125 ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
126 set_thread_flag(TIF_USING_IWMMXT); \
127} while (0)
128
129#endif
130
131#endif
132
133#endif