1/*
  2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
  3 *
  4 *   This program is free software; you can redistribute it and/or
  5 *   modify it under the terms of the GNU General Public License
  6 *   as published by the Free Software Foundation, version 2.
  7 *
  8 *   This program is distributed in the hope that it will be useful, but
  9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 11 *   NON INFRINGEMENT.  See the GNU General Public License for
 12 *   more details.
 13 */
 14
 15#ifndef _ASM_TILE_ELF_H
 16#define _ASM_TILE_ELF_H
 17
 18/*
 19 * ELF register definitions.
 20 */
 21
 22#include <arch/chip.h>
 23
 24#include <linux/ptrace.h>
 25#include <asm/byteorder.h>
 26#include <asm/page.h>
 27
 28typedef unsigned long elf_greg_t;
 29
 30#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
 31typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 32
 33#define EM_TILE64  187
 34#define EM_TILEPRO 188
 35#define EM_TILEGX  191
 36
 37/* Provide a nominal data structure. */
 38#define ELF_NFPREG	0
 39typedef double elf_fpreg_t;
 40typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 41
 42#ifdef __tilegx__
 43#define ELF_CLASS	ELFCLASS64
 44#else
 45#define ELF_CLASS	ELFCLASS32
 46#endif
 47#ifdef __BIG_ENDIAN__
 48#define ELF_DATA	ELFDATA2MSB
 49#else
 50#define ELF_DATA	ELFDATA2LSB
 51#endif
 52
 53/*
 54 * There seems to be a bug in how compat_binfmt_elf.c works: it
 55 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
 56 * Hack around this by providing an enum value of ELF_ARCH.
 57 */
 58enum { ELF_ARCH = CHIP_ELF_TYPE() };
 59#define ELF_ARCH ELF_ARCH
 60
 61/*
 62 * This is used to ensure we don't load something for the wrong architecture.
 63 */
 64#define elf_check_arch(x)  \
 65	((x)->e_ident[EI_CLASS] == ELF_CLASS && \
 66	 (x)->e_ident[EI_DATA] == ELF_DATA && \
 67	 (x)->e_machine == CHIP_ELF_TYPE())
 68
 69/* The module loader only handles a few relocation types. */
 70#ifndef __tilegx__
 71#define R_TILE_32                 1
 72#define R_TILE_JOFFLONG_X1       15
 73#define R_TILE_IMM16_X0_LO       25
 74#define R_TILE_IMM16_X1_LO       26
 75#define R_TILE_IMM16_X0_HA       29
 76#define R_TILE_IMM16_X1_HA       30
 77#else
 78#define R_TILEGX_64                       1
 79#define R_TILEGX_JUMPOFF_X1              21
 80#define R_TILEGX_IMM16_X0_HW0            36
 81#define R_TILEGX_IMM16_X1_HW0            37
 82#define R_TILEGX_IMM16_X0_HW1            38
 83#define R_TILEGX_IMM16_X1_HW1            39
 84#define R_TILEGX_IMM16_X0_HW2_LAST       48
 85#define R_TILEGX_IMM16_X1_HW2_LAST       49
 86#endif
 87
 88/* Use standard page size for core dumps. */
 89#define ELF_EXEC_PAGESIZE	PAGE_SIZE
 90
 91/*
 92 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 93 * use of this is to invoke "./ld.so someprog" to test out a new version of
 94 * the loader.  We need to make sure that it is out of the way of the program
 95 * that it will "exec", and that there is sufficient room for the brk.
 96 */
 97#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 98
 99#define ELF_CORE_COPY_REGS(_dest, _regs)			\
100	memcpy((char *) &_dest, (char *) _regs,			\
101	       sizeof(struct pt_regs));
102
103/* No additional FP registers to copy. */
104#define ELF_CORE_COPY_FPREGS(t, fpu) 0
105
106/*
107 * This yields a mask that user programs can use to figure out what
108 * instruction set this CPU supports.  This could be done in user space,
109 * but it's not easy, and we've already done it here.
110 */
111#define ELF_HWCAP	(0)
112
113/*
114 * This yields a string that ld.so will use to load implementation
115 * specific libraries for optimization.  This is more specific in
116 * intent than poking at uname or /proc/cpuinfo.
117 */
118#define ELF_PLATFORM  (NULL)
119
120extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
121
122#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
123
124extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
125#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
126
127/* Tilera Linux has no personalities currently, so no need to do anything. */
128#define SET_PERSONALITY(ex) do { } while (0)
129
130#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
131/* Support auto-mapping of the user interrupt vectors. */
132struct linux_binprm;
133extern int arch_setup_additional_pages(struct linux_binprm *bprm,
134				       int executable_stack);
135#ifdef CONFIG_COMPAT
136
137#define COMPAT_ELF_PLATFORM "tilegx-m32"
138
139/*
140 * "Compat" binaries have the same machine type, but 32-bit class,
141 * since they're not a separate machine type, but just a 32-bit
142 * variant of the standard 64-bit architecture.
143 */
144#define compat_elf_check_arch(x)  \
145	((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
146	 (x)->e_machine == CHIP_ELF_TYPE())
147
148#define compat_start_thread(regs, ip, usp) do { \
149		regs->pc = ptr_to_compat_reg((void *)(ip)); \
150		regs->sp = ptr_to_compat_reg((void *)(usp)); \
151	} while (0)
152
153/*
154 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
155 */
156#undef SET_PERSONALITY
157#define SET_PERSONALITY(ex) \
158do { \
159	current->personality = PER_LINUX; \
160	current_thread_info()->status &= ~TS_COMPAT; \
161} while (0)
162#define COMPAT_SET_PERSONALITY(ex) \
163do { \
164	current->personality = PER_LINUX_32BIT; \
165	current_thread_info()->status |= TS_COMPAT; \
166} while (0)
167
168#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
169
170#endif /* CONFIG_COMPAT */
171
172#endif /* _ASM_TILE_ELF_H */