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1 #ifndef __ASMARM_ELF_H
2 #define __ASMARM_ELF_H
3 
4 
5 /*
6  * ELF register definitions..
7  */
8 
9 #include <asm/ptrace.h>
10 #include <asm/user.h>
11 #ifdef __KERNEL
12 #include <asm/procinfo.h>
13 #endif
14 
15 typedef unsigned long elf_greg_t;
16 typedef unsigned long elf_freg_t[3];
17 
18 #define EM_ARM	40
19 #define EF_ARM_APCS26 0x08
20 #define EF_ARM_SOFT_FLOAT 0x200
21 #define EF_ARM_EABI_MASK 0xFF000000
22 
23 #define R_ARM_NONE	0
24 #define R_ARM_PC24	1
25 #define R_ARM_ABS32	2
26 #define R_ARM_CALL	28
27 #define R_ARM_JUMP24	29
28 
29 #define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))
30 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
31 
32 typedef struct user_fp elf_fpregset_t;
33 
34 /*
35  * This is used to ensure we don't load something for the wrong architecture.
36  */
37 #define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) )
38 
39 /*
40  * These are used to set parameters in the core dumps.
41  */
42 #define ELF_CLASS	ELFCLASS32
43 #ifdef __ARMEB__
44 #define ELF_DATA	ELFDATA2MSB
45 #else
46 #define ELF_DATA	ELFDATA2LSB
47 #endif
48 #define ELF_ARCH	EM_ARM
49 
50 #define USE_ELF_CORE_DUMP
51 #define ELF_EXEC_PAGESIZE	4096
52 
53 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
54    use of this is to invoke "./ld.so someprog" to test out a new version of
55    the loader.  We need to make sure that it is out of the way of the program
56    that it will "exec", and that there is sufficient room for the brk.  */
57 
58 #define ELF_ET_DYN_BASE	(2 * TASK_SIZE / 3)
59 
60 /* When the program starts, a1 contains a pointer to a function to be
61    registered with atexit, as per the SVR4 ABI.  A value of 0 means we
62    have no such handler.  */
63 #define ELF_PLAT_INIT(_r, load_addr)	(_r)->ARM_r0 = 0
64 
65 /* This yields a mask that user programs can use to figure out what
66    instruction set this cpu supports. */
67 
68 #define ELF_HWCAP	(elf_hwcap)
69 
70 /* This yields a string that ld.so will use to load implementation
71    specific libraries for optimization.  This is more specific in
72    intent than poking at uname or /proc/cpuinfo. */
73 
74 /* For now we just provide a fairly general string that describes the
75    processor family.  This could be made more specific later if someone
76    implemented optimisations that require it.  26-bit CPUs give you
77    "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't
78    supported).  32-bit CPUs give you "v3[lb]" for anything based on an
79    ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1
80    core.  */
81 
82 #define ELF_PLATFORM_SIZE 8
83 extern char elf_platform[];
84 #define ELF_PLATFORM	(elf_platform)
85 
86 #ifdef __KERNEL__
87 
88 /*
89  * 32-bit code is always OK.  Some cpus can do 26-bit, some can't.
90  */
91 #define ELF_PROC_OK(x)	(ELF_THUMB_OK(x) && ELF_26BIT_OK(x))
92 
93 #define ELF_THUMB_OK(x) \
94 	(( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \
95 	 ((x)->e_entry & 3) == 0)
96 
97 #define ELF_26BIT_OK(x) \
98 	(( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \
99 	  ((x)->e_flags & EF_ARM_APCS26) == 0)
100 
101 #ifndef CONFIG_IWMMXT
102 
103 /* Old NetWinder binaries were compiled in such a way that the iBCS
104    heuristic always trips on them.  Until these binaries become uncommon
105    enough not to care, don't trust the `ibcs' flag here.  In any case
106    there is no other ELF system currently supported by iBCS.
107    @@ Could print a warning message to encourage users to upgrade.  */
108 #define SET_PERSONALITY(ex,ibcs2) \
109 	set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT))
110 
111 #else
112 
113 /*
114  * All iWMMXt capable CPUs don't support 26-bit mode.  Yet they can run
115  * legacy binaries which used to contain FPA11 floating point instructions
116  * that have always been emulated by the kernel.  PFA11 and iWMMXt overlap
117  * on coprocessor 1 space though.  We therefore must decide if given task
118  * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked
119  * at all times for the prefetch exception handler to catch FPA11 opcodes
120  * and emulate them.  The best indication to discriminate those two cases
121  * is the SOFT_FLOAT flag in the ELF header.
122  */
123 
124 #define SET_PERSONALITY(ex,ibcs2) \
125 do { \
126 	set_personality(PER_LINUX_32BIT); \
127 	if (((ex).e_flags & EF_ARM_EABI_MASK) || \
128 	    ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \
129 		set_thread_flag(TIF_USING_IWMMXT); \
130 	else \
131 		clear_thread_flag(TIF_USING_IWMMXT); \
132 } while (0)
133 
134 #endif
135 
136 struct task_struct;
137 
138 extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
139 
140 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
141 
142 
143 #endif
144 
145 #endif
146