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 reserved[8+48]; 88 elf_greg_t a[64]; 89 } xtensa_gregset_t; 90 91 #define ELF_NGREG (sizeof(xtensa_gregset_t) / sizeof(elf_greg_t)) 92 93 typedef elf_greg_t elf_gregset_t[ELF_NGREG]; 94 95 #define ELF_NFPREG 18 96 97 typedef unsigned int elf_fpreg_t; 98 typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG]; 99 100 #define ELF_CORE_COPY_REGS(_eregs, _pregs) \ 101 xtensa_elf_core_copy_regs ((xtensa_gregset_t*)&(_eregs), _pregs); 102 103 extern void xtensa_elf_core_copy_regs (xtensa_gregset_t *, struct pt_regs *); 104 105 /* 106 * This is used to ensure we don't load something for the wrong architecture. 107 */ 108 109 #define elf_check_arch(x) ( ( (x)->e_machine == EM_XTENSA ) || \ 110 ( (x)->e_machine == EM_XTENSA_OLD ) ) 111 112 /* 113 * These are used to set parameters in the core dumps. 114 */ 115 116 #ifdef __XTENSA_EL__ 117 # define ELF_DATA ELFDATA2LSB 118 #elif defined(__XTENSA_EB__) 119 # define ELF_DATA ELFDATA2MSB 120 #else 121 # error processor byte order undefined! 122 #endif 123 124 #define ELF_CLASS ELFCLASS32 125 #define ELF_ARCH EM_XTENSA 126 127 #define ELF_EXEC_PAGESIZE PAGE_SIZE 128 129 /* 130 * This is the location that an ET_DYN program is loaded if exec'ed. Typical 131 * use of this is to invoke "./ld.so someprog" to test out a new version of 132 * the loader. We need to make sure that it is out of the way of the program 133 * that it will "exec", and that there is sufficient room for the brk. 134 */ 135 136 #define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3) 137 138 /* 139 * This yields a mask that user programs can use to figure out what 140 * instruction set this CPU supports. This could be done in user space, 141 * but it's not easy, and we've already done it here. 142 */ 143 144 #define ELF_HWCAP (0) 145 146 /* 147 * This yields a string that ld.so will use to load implementation 148 * specific libraries for optimization. This is more specific in 149 * intent than poking at uname or /proc/cpuinfo. 150 * For the moment, we have only optimizations for the Intel generations, 151 * but that could change... 152 */ 153 154 #define ELF_PLATFORM (NULL) 155 156 /* 157 * The Xtensa processor ABI says that when the program starts, a2 158 * contains a pointer to a function which might be registered using 159 * `atexit'. This provides a mean for the dynamic linker to call 160 * DT_FINI functions for shared libraries that have been loaded before 161 * the code runs. 162 * 163 * A value of 0 tells we have no such handler. 164 * 165 * We might as well make sure everything else is cleared too (except 166 * for the stack pointer in a1), just to make things more 167 * deterministic. Also, clearing a0 terminates debugger backtraces. 168 */ 169 170 #define ELF_PLAT_INIT(_r, load_addr) \ 171 do { _r->areg[0]=0; /*_r->areg[1]=0;*/ _r->areg[2]=0; _r->areg[3]=0; \ 172 _r->areg[4]=0; _r->areg[5]=0; _r->areg[6]=0; _r->areg[7]=0; \ 173 _r->areg[8]=0; _r->areg[9]=0; _r->areg[10]=0; _r->areg[11]=0; \ 174 _r->areg[12]=0; _r->areg[13]=0; _r->areg[14]=0; _r->areg[15]=0; \ 175 } while (0) 176 177 typedef struct { 178 xtregs_opt_t opt; 179 xtregs_user_t user; 180 #if XTENSA_HAVE_COPROCESSORS 181 xtregs_cp0_t cp0; 182 xtregs_cp1_t cp1; 183 xtregs_cp2_t cp2; 184 xtregs_cp3_t cp3; 185 xtregs_cp4_t cp4; 186 xtregs_cp5_t cp5; 187 xtregs_cp6_t cp6; 188 xtregs_cp7_t cp7; 189 #endif 190 } elf_xtregs_t; 191 192 #define SET_PERSONALITY(ex) \ 193 set_personality(PER_LINUX_32BIT | (current->personality & (~PER_MASK))) 194 195 struct task_struct; 196 197 extern void do_copy_regs (xtensa_gregset_t*, struct pt_regs*, 198 struct task_struct*); 199 extern void do_restore_regs (xtensa_gregset_t*, struct pt_regs*, 200 struct task_struct*); 201 extern void do_save_fpregs (elf_fpregset_t*, struct pt_regs*, 202 struct task_struct*); 203 extern int do_restore_fpregs (elf_fpregset_t*, struct pt_regs*, 204 struct task_struct*); 205 206 #endif /* _XTENSA_ELF_H */ 207