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 <linux/elf-em.h>
 26#include <asm/byteorder.h>
 27#include <asm/page.h>
 28
 29typedef unsigned long elf_greg_t;
 30
 31#define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
 32typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 33
 34/* Provide a nominal data structure. */
 35#define ELF_NFPREG	0
 36typedef double elf_fpreg_t;
 37typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
 38
 39#ifdef __tilegx__
 40#define ELF_CLASS	ELFCLASS64
 41#else
 42#define ELF_CLASS	ELFCLASS32
 43#endif
 44#ifdef __BIG_ENDIAN__
 45#define ELF_DATA	ELFDATA2MSB
 46#else
 47#define ELF_DATA	ELFDATA2LSB
 48#endif
 49
 50/*
 51 * There seems to be a bug in how compat_binfmt_elf.c works: it
 52 * #undefs ELF_ARCH, but it is then used in binfmt_elf.c for fill_note_info().
 53 * Hack around this by providing an enum value of ELF_ARCH.
 54 */
 55enum { ELF_ARCH = CHIP_ELF_TYPE() };
 56#define ELF_ARCH ELF_ARCH
 57
 58/*
 59 * This is used to ensure we don't load something for the wrong architecture.
 60 */
 61#define elf_check_arch(x)  \
 62	((x)->e_ident[EI_CLASS] == ELF_CLASS && \
 63	 (x)->e_ident[EI_DATA] == ELF_DATA && \
 64	 (x)->e_machine == CHIP_ELF_TYPE())
 65
 66/* The module loader only handles a few relocation types. */
 67#ifndef __tilegx__
 68#define R_TILE_32                 1
 69#define R_TILE_JOFFLONG_X1       15
 70#define R_TILE_IMM16_X0_LO       25
 71#define R_TILE_IMM16_X1_LO       26
 72#define R_TILE_IMM16_X0_HA       29
 73#define R_TILE_IMM16_X1_HA       30
 74#else
 75#define R_TILEGX_64                       1
 76#define R_TILEGX_JUMPOFF_X1              21
 77#define R_TILEGX_IMM16_X0_HW0            36
 78#define R_TILEGX_IMM16_X1_HW0            37
 79#define R_TILEGX_IMM16_X0_HW1            38
 80#define R_TILEGX_IMM16_X1_HW1            39
 81#define R_TILEGX_IMM16_X0_HW2_LAST       48
 82#define R_TILEGX_IMM16_X1_HW2_LAST       49
 83#endif
 84
 85/* Use standard page size for core dumps. */
 86#define ELF_EXEC_PAGESIZE	PAGE_SIZE
 87
 88/*
 89 * This is the location that an ET_DYN program is loaded if exec'ed.  Typical
 90 * use of this is to invoke "./ld.so someprog" to test out a new version of
 91 * the loader.  We need to make sure that it is out of the way of the program
 92 * that it will "exec", and that there is sufficient room for the brk.
 93 */
 94#define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
 95
 96#define ELF_CORE_COPY_REGS(_dest, _regs)			\
 97	memcpy((char *) &_dest, (char *) _regs,			\
 98	       sizeof(struct pt_regs));
 99
100/* No additional FP registers to copy. */
101#define ELF_CORE_COPY_FPREGS(t, fpu) 0
102
103/*
104 * This yields a mask that user programs can use to figure out what
105 * instruction set this CPU supports.  This could be done in user space,
106 * but it's not easy, and we've already done it here.
107 */
108#define ELF_HWCAP	(0)
109
110/*
111 * This yields a string that ld.so will use to load implementation
112 * specific libraries for optimization.  This is more specific in
113 * intent than poking at uname or /proc/cpuinfo.
114 */
115#define ELF_PLATFORM  (NULL)
116
117extern void elf_plat_init(struct pt_regs *regs, unsigned long load_addr);
118
119#define ELF_PLAT_INIT(_r, load_addr) elf_plat_init(_r, load_addr)
120
121extern int dump_task_regs(struct task_struct *, elf_gregset_t *);
122#define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
123
124/* Tilera Linux has no personalities currently, so no need to do anything. */
125#define SET_PERSONALITY(ex) do { } while (0)
126
127#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
128/* Support auto-mapping of the user interrupt vectors. */
129struct linux_binprm;
130extern int arch_setup_additional_pages(struct linux_binprm *bprm,
131				       int executable_stack);
132#define ARCH_DLINFO \
133do { \
134	NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_BASE); \
135} while (0)
136
137struct mm_struct;
138extern unsigned long arch_randomize_brk(struct mm_struct *mm);
139#define arch_randomize_brk arch_randomize_brk
140
141#ifdef CONFIG_COMPAT
142
143#define COMPAT_ELF_PLATFORM "tilegx-m32"
144
145/*
146 * "Compat" binaries have the same machine type, but 32-bit class,
147 * since they're not a separate machine type, but just a 32-bit
148 * variant of the standard 64-bit architecture.
149 */
150#define compat_elf_check_arch(x)  \
151	((x)->e_ident[EI_CLASS] == ELFCLASS32 && \
152	 (x)->e_machine == CHIP_ELF_TYPE())
153
154#define compat_start_thread(regs, ip, usp) do { \
155		regs->pc = ptr_to_compat_reg((void *)(ip)); \
156		regs->sp = ptr_to_compat_reg((void *)(usp)); \
157		single_step_execve();	\
158	} while (0)
159
160/*
161 * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
162 */
163#undef SET_PERSONALITY
164#define SET_PERSONALITY(ex) \
165do { \
166	set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
167	current_thread_info()->status &= ~TS_COMPAT; \
168} while (0)
169#define COMPAT_SET_PERSONALITY(ex) \
170do { \
171	set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
172	current_thread_info()->status |= TS_COMPAT; \
173} while (0)
174
175#define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
176
177#endif /* CONFIG_COMPAT */
178
179#define CORE_DUMP_USE_REGSET
180
181#endif /* _ASM_TILE_ELF_H */