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Diffstat (limited to 'include/asm-arm/elf.h')
| -rw-r--r-- | include/asm-arm/elf.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/include/asm-arm/elf.h b/include/asm-arm/elf.h new file mode 100644 index 00000000000..cbceacbe5af --- /dev/null +++ b/include/asm-arm/elf.h @@ -0,0 +1,133 @@ +#ifndef __ASMARM_ELF_H +#define __ASMARM_ELF_H + +#include <linux/config.h> + +/* + * ELF register definitions.. + */ + +#include <asm/ptrace.h> +#include <asm/user.h> +#include <asm/procinfo.h> + +typedef unsigned long elf_greg_t; +typedef unsigned long elf_freg_t[3]; + +#define EM_ARM 40 +#define EF_ARM_APCS26 0x08 +#define EF_ARM_SOFT_FLOAT 0x200 +#define EF_ARM_EABI_MASK 0xFF000000 + +#define R_ARM_NONE 0 +#define R_ARM_PC24 1 +#define R_ARM_ABS32 2 + +#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t)) +typedef elf_greg_t elf_gregset_t[ELF_NGREG]; + +typedef struct user_fp elf_fpregset_t; + +/* + * This is used to ensure we don't load something for the wrong architecture. + */ +#define elf_check_arch(x) ( ((x)->e_machine == EM_ARM) && (ELF_PROC_OK((x))) ) + +/* + * These are used to set parameters in the core dumps. + */ +#define ELF_CLASS ELFCLASS32 +#ifdef __ARMEB__ +#define ELF_DATA ELFDATA2MSB; +#else +#define ELF_DATA ELFDATA2LSB; +#endif +#define ELF_ARCH EM_ARM + +#define USE_ELF_CORE_DUMP +#define ELF_EXEC_PAGESIZE 4096 + +/* 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) + +/* When the program starts, a1 contains a pointer to a function to be + registered with atexit, as per the SVR4 ABI. A value of 0 means we + have no such handler. */ +#define ELF_PLAT_INIT(_r, load_addr) (_r)->ARM_r0 = 0 + +/* This yields a mask that user programs can use to figure out what + instruction set this cpu supports. */ + +#define ELF_HWCAP (elf_hwcap) + +/* 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 now we just provide a fairly general string that describes the + processor family. This could be made more specific later if someone + implemented optimisations that require it. 26-bit CPUs give you + "v1l" for ARM2 (no SWP) and "v2l" for anything else (ARM1 isn't + supported). 32-bit CPUs give you "v3[lb]" for anything based on an + ARM6 or ARM7 core and "armv4[lb]" for anything based on a StrongARM-1 + core. */ + +#define ELF_PLATFORM_SIZE 8 +extern char elf_platform[]; +#define ELF_PLATFORM (elf_platform) + +#ifdef __KERNEL__ + +/* + * 32-bit code is always OK. Some cpus can do 26-bit, some can't. + */ +#define ELF_PROC_OK(x) (ELF_THUMB_OK(x) && ELF_26BIT_OK(x)) + +#define ELF_THUMB_OK(x) \ + (( (elf_hwcap & HWCAP_THUMB) && ((x)->e_entry & 1) == 1) || \ + ((x)->e_entry & 3) == 0) + +#define ELF_26BIT_OK(x) \ + (( (elf_hwcap & HWCAP_26BIT) && (x)->e_flags & EF_ARM_APCS26) || \ + ((x)->e_flags & EF_ARM_APCS26) == 0) + +#ifndef CONFIG_IWMMXT + +/* Old NetWinder binaries were compiled in such a way that the iBCS + heuristic always trips on them. Until these binaries become uncommon + enough not to care, don't trust the `ibcs' flag here. In any case + there is no other ELF system currently supported by iBCS. + @@ Could print a warning message to encourage users to upgrade. */ +#define SET_PERSONALITY(ex,ibcs2) \ + set_personality(((ex).e_flags&EF_ARM_APCS26 ?PER_LINUX :PER_LINUX_32BIT)) + +#else + +/* + * All iWMMXt capable CPUs don't support 26-bit mode. Yet they can run + * legacy binaries which used to contain FPA11 floating point instructions + * that have always been emulated by the kernel. PFA11 and iWMMXt overlap + * on coprocessor 1 space though. We therefore must decide if given task + * is allowed to use CP 0 and 1 for iWMMXt, or if they should be blocked + * at all times for the prefetch exception handler to catch FPA11 opcodes + * and emulate them. The best indication to discriminate those two cases + * is the SOFT_FLOAT flag in the ELF header. + */ + +#define SET_PERSONALITY(ex,ibcs2) \ +do { \ + set_personality(PER_LINUX_32BIT); \ + if (((ex).e_flags & EF_ARM_EABI_MASK) || \ + ((ex).e_flags & EF_ARM_SOFT_FLOAT)) \ + set_thread_flag(TIF_USING_IWMMXT); \ +} while (0) + +#endif + +#endif + +#endif |