/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/

#ifndef _ASM_TILE_ELF_H
#define _ASM_TILE_ELF_H

/*
* ELF register definitions.
*/

#include <arch/chip.h>

#include <linux/ptrace.h>
#include <asm/byteorder.h>
#include <asm/page.h>

typedef unsigned long elf_greg_t;

#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
typedef elf_greg_t elf_gregset_t[ELF_NGREG];

#define EM_TILEPRO 188
#define EM_TILEGX 191

/* Provide a nominal data structure. */
#define ELF_NFPREG 0
typedef double elf_fpreg_t;
typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];

#ifdef __tilegx__
#define ELF_CLASS ELFCLASS64
#else
#define ELF_CLASS ELFCLASS32
#endif
#ifdef __BIG_ENDIAN__
#define ELF_DATA ELFDATA2MSB
#else
#define ELF_DATA ELFDATA2LSB
#endif

/*
* There seems to be a bug in how compat_binfmt_elf.c works: it
* #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
* Hack around this by providing an enum value of ELF_ARCH.
*/
enum { ELF_ARCH = CHIP_ELF_TYPE() };
#define ELF_ARCH ELF_ARCH

/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(x) \
((x)->e_ident[EI_CLASS] == ELF_CLASS && \
(x)->e_ident[EI_DATA] == ELF_DATA && \
(x)->e_machine == CHIP_ELF_TYPE())

/* The module loader only handles a few relocation types. */
#ifndef __tilegx__
#define R_TILE_32 1
#define R_TILE_JOFFLONG_X1 15
#define R_TILE_IMM16_X0_LO 25
#define R_TILE_IMM16_X1_LO 26
#define R_TILE_IMM16_X0_HA 29
#define R_TILE_IMM16_X1_HA 30
#else
#define R_TILEGX_64 1
#define R_TILEGX_JUMPOFF_X1 21
#define R_TILEGX_IMM16_X0_HW0 36
#define R_TILEGX_IMM16_X1_HW0 37
#define R_TILEGX_IMM16_X0_HW1 38
#define R_TILEGX_IMM16_X1_HW1 39
#define R_TILEGX_IMM16_X0_HW2_LAST 48
#define R_TILEGX_IMM16_X1_HW2_LAST 49
#endif

/* Use standard page size for core dumps. */
#define ELF_EXEC_PAGESIZE PAGE_SIZE

/*
* 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 (TASK_SIZE / 3 * 2)

#define ELF_CORE_COPY_REGS(_dest, _regs) \
memcpy((char *) &_dest, (char *) _regs, \
sizeof(struct pt_regs));

/* No additional FP registers to copy. */
#define ELF_CORE_COPY_FPREGS(t, fpu) 0

/*
* This yields a mask that user programs can use to figure out what
* instruction set this CPU supports. This could be done in user space,
* but it's not easy, and we've already done it here.
*/
#define ELF_HWCAP (0)

/*
* 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.
*/
#define ELF_PLATFORM (NULL)

extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);

#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)

extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)

/* Tilera Linux has no personalities currently, so no need to do anything. */
#define SET_PERSONALITY(ex) do { } while (0)

#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
/* Support auto-mapping of the user interrupt vectors. */
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int executable_stack);
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
} while (0)

struct mm_struct;
extern unsigned long arch_randomize_brk(struct mm_struct *mm);
#define arch_randomize_brk arch_randomize_brk

#ifdef CONFIG_COMPAT

#define COMPAT_ELF_PLATFORM "tilegx-m32"

/*
* "Compat" binaries have the same machine type, but 32-bit class,
* since they're not a separate machine type, but just a 32-bit
* variant of the standard 64-bit architecture.
*/
#define compat_elf_check_arch(x) \
((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
(x)->e_machine == CHIP_ELF_TYPE())

#define compat_start_thread(regs, ip, usp) do { \
regs->pc = ptr_to_compat_reg((void *)(ip)); \
regs->sp = ptr_to_compat_reg((void *)(usp)); \
single_step_execve(); \
} while (0)

/*
* Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
*/
#undef SET_PERSONALITY
#define SET_PERSONALITY(ex) \
do { \
set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
current_thread_info()->status &= ~TS_COMPAT; \
} while (0)
#define COMPAT_SET_PERSONALITY(ex) \
do { \
set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
current_thread_info()->status |= TS_COMPAT; \
} while (0)

#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)

#endif /* CONFIG_COMPAT */

#define CORE_DUMP_USE_REGSET

#endif /* _ASM_TILE_ELF_H */