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