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#define ELF_DATA	ELFDATA2LSB
 48
 49/*
 50 * There seems to be a bug in how compat_binfmt_elf.c works: it
 51 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
 52 * Hack around this by providing an enum value of ELF_ARCH.
 53 */
 54enum { ELF_ARCH = CHIP_ELF_TYPE() };
 55#define ELF_ARCH ELF_ARCH
 56
 57/*
 58 * This is used to ensure we don't load something for the wrong architecture.
 59 */
 60#define elf_check_arch(x)  \
 61	((x)->e_ident[EI_CLASS] == ELF_CLASS && \
 62	 (x)->e_machine == CHIP_ELF_TYPE())
 63
 64/* The module loader only handles a few relocation types. */
 65#ifndef __tilegx__
 66#define R_TILE_32                 1
 67#define R_TILE_JOFFLONG_X1       15
 68#define R_TILE_IMM16_X0_LO       25
 69#define R_TILE_IMM16_X1_LO       26
 70#define R_TILE_IMM16_X0_HA       29
 71#define R_TILE_IMM16_X1_HA       30
 72#else
 73#define R_TILEGX_64                       1
 74#define R_TILEGX_JUMPOFF_X1              21
 75#define R_TILEGX_IMM16_X0_HW0            36
 76#define R_TILEGX_IMM16_X1_HW0            37
 77#define R_TILEGX_IMM16_X0_HW1            38
 78#define R_TILEGX_IMM16_X1_HW1            39
 79#define R_TILEGX_IMM16_X0_HW2_LAST       48
 80#define R_TILEGX_IMM16_X1_HW2_LAST       49
 81#endif
 82
 83/* Use standard page size for core dumps. */
 84#define ELF_EXEC_PAGESIZE	PAGE_SIZE
 85
 86/*
 87 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 88 * use of this is to invoke "./ld.so someprog" to test out a new version of
 89 * the loader.  We need to make sure that it is out of the way of the program
 90 * that it will "exec", and that there is sufficient room for the brk.
 91 */
 92#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 93
 94#define ELF_CORE_COPY_REGS(_dest, _regs)			\
 95	memcpy((char *) &_dest, (char *) _regs,			\
 96	       sizeof(struct pt_regs));
 97
 98/* No additional FP registers to copy. */
 99#define ELF_CORE_COPY_FPREGS(t, fpu) 0
100
101/*
102 * This yields a mask that user programs can use to figure out what
103 * instruction set this CPU supports.  This could be done in user space,
104 * but it's not easy, and we've already done it here.
105 */
106#define ELF_HWCAP	(0)
107
108/*
109 * This yields a string that ld.so will use to load implementation
110 * specific libraries for optimization.  This is more specific in
111 * intent than poking at uname or /proc/cpuinfo.
112 */
113#define ELF_PLATFORM  (NULL)
114
115extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
116
117#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
118
119extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
120#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
121
122/* Tilera Linux has no personalities currently, so no need to do anything. */
123#define SET_PERSONALITY(ex) do { } while (0)
124
125#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
126/* Support auto-mapping of the user interrupt vectors. */
127struct linux_binprm;
128extern int arch_setup_additional_pages(struct linux_binprm *bprm,
129				       int executable_stack);
130#ifdef CONFIG_COMPAT
131
132#define COMPAT_ELF_PLATFORM "tilegx-m32"
133
134/*
135 * "Compat" binaries have the same machine type, but 32-bit class,
136 * since they're not a separate machine type, but just a 32-bit
137 * variant of the standard 64-bit architecture.
138 */
139#define compat_elf_check_arch(x)  \
140	((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
141	 (x)->e_machine == CHIP_ELF_TYPE())
142
143#define compat_start_thread(regs, ip, usp) do { \
144		regs->pc = ptr_to_compat_reg((void *)(ip)); \
145		regs->sp = ptr_to_compat_reg((void *)(usp)); \
146	} while (0)
147
148/*
149 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
150 */
151#undef SET_PERSONALITY
152#define SET_PERSONALITY(ex) \
153do { \
154	current->personality = PER_LINUX; \
155	current_thread_info()->status &= ~TS_COMPAT; \
156} while (0)
157#define COMPAT_SET_PERSONALITY(ex) \
158do { \
159	current->personality = PER_LINUX_32BIT; \
160	current_thread_info()->status |= TS_COMPAT; \
161} while (0)
162
163#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
164
165#endif /* CONFIG_COMPAT */
166
167#endif /* _ASM_TILE_ELF_H */