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Linux/arch/tile/include/asm/elf.h

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  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 
 28 typedef unsigned long elf_greg_t;
 29 
 30 #define ELF_NGREG (sizeof(struct pt_regs) / sizeof(elf_greg_t))
 31 typedef 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
 39 typedef double elf_fpreg_t;
 40 typedef 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  */
 58 enum { 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 
120 extern 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 
124 extern 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. */
132 struct linux_binprm;
133 extern 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                 single_step_execve();   \
152         } while (0)
153 
154 /*
155  * Use SET_PERSONALITY to indicate compatibility via TS_COMPAT.
156  */
157 #undef SET_PERSONALITY
158 #define SET_PERSONALITY(ex) \
159 do { \
160         set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
161         current_thread_info()->status &= ~TS_COMPAT; \
162 } while (0)
163 #define COMPAT_SET_PERSONALITY(ex) \
164 do { \
165         set_personality(PER_LINUX | (current->personality & (~PER_MASK))); \
166         current_thread_info()->status |= TS_COMPAT; \
167 } while (0)
168 
169 #define COMPAT_ELF_ET_DYN_BASE (0xffffffff / 3 * 2)
170 
171 #endif /* CONFIG_COMPAT */
172 
173 #define CORE_DUMP_USE_REGSET
174 
175 #endif /* _ASM_TILE_ELF_H */
176 

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