1 /* 2 * include/asm-xtensa/elf.h 3 * 4 * ELF register definitions 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 2001 - 2005 Tensilica Inc. 11 */ 12 13 #ifndef _XTENSA_ELF_H 14 #define _XTENSA_ELF_H 15 16 #include <asm/ptrace.h> 17 #include <asm/coprocessor.h> 18 19 /* Xtensa processor ELF architecture-magic number */ 20 21 #define EM_XTENSA 94 22 #define EM_XTENSA_OLD 0xABC7 23 24 /* Xtensa relocations defined by the ABIs */ 25 26 #define R_XTENSA_NONE 0 27 #define R_XTENSA_32 1 28 #define R_XTENSA_RTLD 2 29 #define R_XTENSA_GLOB_DAT 3 30 #define R_XTENSA_JMP_SLOT 4 31 #define R_XTENSA_RELATIVE 5 32 #define R_XTENSA_PLT 6 33 #define R_XTENSA_OP0 8 34 #define R_XTENSA_OP1 9 35 #define R_XTENSA_OP2 10 36 #define R_XTENSA_ASM_EXPAND 11 37 #define R_XTENSA_ASM_SIMPLIFY 12 38 #define R_XTENSA_GNU_VTINHERIT 15 39 #define R_XTENSA_GNU_VTENTRY 16 40 #define R_XTENSA_DIFF8 17 41 #define R_XTENSA_DIFF16 18 42 #define R_XTENSA_DIFF32 19 43 #define R_XTENSA_SLOT0_OP 20 44 #define R_XTENSA_SLOT1_OP 21 45 #define R_XTENSA_SLOT2_OP 22 46 #define R_XTENSA_SLOT3_OP 23 47 #define R_XTENSA_SLOT4_OP 24 48 #define R_XTENSA_SLOT5_OP 25 49 #define R_XTENSA_SLOT6_OP 26 50 #define R_XTENSA_SLOT7_OP 27 51 #define R_XTENSA_SLOT8_OP 28 52 #define R_XTENSA_SLOT9_OP 29 53 #define R_XTENSA_SLOT10_OP 30 54 #define R_XTENSA_SLOT11_OP 31 55 #define R_XTENSA_SLOT12_OP 32 56 #define R_XTENSA_SLOT13_OP 33 57 #define R_XTENSA_SLOT14_OP 34 58 #define R_XTENSA_SLOT0_ALT 35 59 #define R_XTENSA_SLOT1_ALT 36 60 #define R_XTENSA_SLOT2_ALT 37 61 #define R_XTENSA_SLOT3_ALT 38 62 #define R_XTENSA_SLOT4_ALT 39 63 #define R_XTENSA_SLOT5_ALT 40 64 #define R_XTENSA_SLOT6_ALT 41 65 #define R_XTENSA_SLOT7_ALT 42 66 #define R_XTENSA_SLOT8_ALT 43 67 #define R_XTENSA_SLOT9_ALT 44 68 #define R_XTENSA_SLOT10_ALT 45 69 #define R_XTENSA_SLOT11_ALT 46 70 #define R_XTENSA_SLOT12_ALT 47 71 #define R_XTENSA_SLOT13_ALT 48 72 #define R_XTENSA_SLOT14_ALT 49 73 74 /* ELF register definitions. This is needed for core dump support. */ 75 76 typedef unsigned long elf_greg_t; 77 78 typedef struct { 79 elf_greg_t pc; 80 elf_greg_t ps; 81 elf_greg_t lbeg; 82 elf_greg_t lend; 83 elf_greg_t lcount; 84 elf_greg_t sar; 85 elf_greg_t windowstart; 86 elf_greg_t windowbase; 87 elf_greg_t threadptr; 88 elf_greg_t reserved[7+48]; 89 elf_greg_t a[64]; 90 } xtensa_gregset_t; 91 92 #define ELF_NGREG (sizeof(xtensa_gregset_t) / sizeof(elf_greg_t)) 93 94 typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 95 96 #define ELF_NFPREG 18 97 98 typedef unsigned int elf_fpreg_t; 99 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; 100 101 #define ELF_CORE_COPY_REGS(_eregs, _pregs) \ 102 xtensa_elf_core_copy_regs ((xtensa_gregset_t*)&(_eregs), _pregs); 103 104 extern void xtensa_elf_core_copy_regs (xtensa_gregset_t *, struct pt_regs *); 105 106 /* 107 * This is used to ensure we don't load something for the wrong architecture. 108 */ 109 110 #define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA ) || \ 111 ( (x)->e_machine == EM_XTENSA_OLD ) ) 112 113 /* 114 * These are used to set parameters in the core dumps. 115 */ 116 117 #ifdef __XTENSA_EL__ 118 # define ELF_DATA ELFDATA2LSB 119 #elif defined(__XTENSA_EB__) 120 # define ELF_DATA ELFDATA2MSB 121 #else 122 # error processor byte order undefined! 123 #endif 124 125 #define ELF_CLASS ELFCLASS32 126 #define ELF_ARCH EM_XTENSA 127 128 #define ELF_EXEC_PAGESIZE PAGE_SIZE 129 130 /* 131 * This is the location that an ET_DYN program is loaded if exec'ed. Typical 132 * use of this is to invoke "./ld.so someprog" to test out a new version of 133 * the loader. We need to make sure that it is out of the way of the program 134 * that it will "exec", and that there is sufficient room for the brk. 135 */ 136 137 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3) 138 139 /* 140 * This yields a mask that user programs can use to figure out what 141 * instruction set this CPU supports. This could be done in user space, 142 * but it's not easy, and we've already done it here. 143 */ 144 145 #define ELF_HWCAP (0) 146 147 /* 148 * This yields a string that ld.so will use to load implementation 149 * specific libraries for optimization. This is more specific in 150 * intent than poking at uname or /proc/cpuinfo. 151 * For the moment, we have only optimizations for the Intel generations, 152 * but that could change... 153 */ 154 155 #define ELF_PLATFORM (NULL) 156 157 /* 158 * The Xtensa processor ABI says that when the program starts, a2 159 * contains a pointer to a function which might be registered using 160 * `atexit'. This provides a mean for the dynamic linker to call 161 * DT_FINI functions for shared libraries that have been loaded before 162 * the code runs. 163 * 164 * A value of 0 tells we have no such handler. 165 * 166 * We might as well make sure everything else is cleared too (except 167 * for the stack pointer in a1), just to make things more 168 * deterministic. Also, clearing a0 terminates debugger backtraces. 169 */ 170 171 #define ELF_PLAT_INIT(_r, load_addr) \ 172 do { _r->areg[0]=0; /*_r->areg[1]=0;*/ _r->areg[2]=0; _r->areg[3]=0; \ 173 _r->areg[4]=0; _r->areg[5]=0; _r->areg[6]=0; _r->areg[7]=0; \ 174 _r->areg[8]=0; _r->areg[9]=0; _r->areg[10]=0; _r->areg[11]=0; \ 175 _r->areg[12]=0; _r->areg[13]=0; _r->areg[14]=0; _r->areg[15]=0; \ 176 } while (0) 177 178 typedef struct { 179 xtregs_opt_t opt; 180 xtregs_user_t user; 181 #if XTENSA_HAVE_COPROCESSORS 182 xtregs_cp0_t cp0; 183 xtregs_cp1_t cp1; 184 xtregs_cp2_t cp2; 185 xtregs_cp3_t cp3; 186 xtregs_cp4_t cp4; 187 xtregs_cp5_t cp5; 188 xtregs_cp6_t cp6; 189 xtregs_cp7_t cp7; 190 #endif 191 } elf_xtregs_t; 192 193 #define SET_PERSONALITY(ex) \ 194 set_personality(PER_LINUX_32BIT | (current->personality & (~PER_MASK))) 195 196 struct task_struct; 197 198 extern void do_copy_regs (xtensa_gregset_t*, struct pt_regs*, 199 struct task_struct*); 200 extern void do_restore_regs (xtensa_gregset_t*, struct pt_regs*, 201 struct task_struct*); 202 extern void do_save_fpregs (elf_fpregset_t*, struct pt_regs*, 203 struct task_struct*); 204 extern int do_restore_fpregs (elf_fpregset_t*, struct pt_regs*, 205 struct task_struct*); 206 207 #endif /* _XTENSA_ELF_H */ 208