1 /* 2 * include/asm-xtensa/ptrace.h 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 */ 10 #ifndef _XTENSA_PTRACE_H 11 #define _XTENSA_PTRACE_H 12 13 #include <asm/kmem_layout.h> 14 #include <uapi/asm/ptrace.h> 15 16 /* 17 * Kernel stack 18 * 19 * +-----------------------+ -------- STACK_SIZE 20 * | register file | | 21 * +-----------------------+ | 22 * | struct pt_regs | | 23 * +-----------------------+ | ------ PT_REGS_OFFSET 24 * double : 16 bytes spill area : | ^ 25 * excetion :- - - - - - - - - - - -: | | 26 * frame : struct pt_regs : | | 27 * :- - - - - - - - - - - -: | | 28 * | | | | 29 * | memory stack | | | 30 * | | | | 31 * ~ ~ ~ ~ 32 * ~ ~ ~ ~ 33 * | | | | 34 * | | | | 35 * +-----------------------+ | | --- STACK_BIAS 36 * | struct task_struct | | | ^ 37 * current --> +-----------------------+ | | | 38 * | struct thread_info | | | | 39 * +-----------------------+ -------- 40 */ 41 42 /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */ 43 44 #define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ 45 #define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ 46 #define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ 47 #define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ 48 #define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ 49 #define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ 50 #define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ 51 #define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ 52 #define EXC_TABLE_SIZE 0x400 53 54 #ifndef __ASSEMBLY__ 55 56 #include <asm/coprocessor.h> 57 58 /* 59 * This struct defines the way the registers are stored on the 60 * kernel stack during a system call or other kernel entry. 61 */ 62 struct pt_regs { 63 unsigned long pc; /* 4 */ 64 unsigned long ps; /* 8 */ 65 unsigned long depc; /* 12 */ 66 unsigned long exccause; /* 16 */ 67 unsigned long excvaddr; /* 20 */ 68 unsigned long debugcause; /* 24 */ 69 unsigned long wmask; /* 28 */ 70 unsigned long lbeg; /* 32 */ 71 unsigned long lend; /* 36 */ 72 unsigned long lcount; /* 40 */ 73 unsigned long sar; /* 44 */ 74 unsigned long windowbase; /* 48 */ 75 unsigned long windowstart; /* 52 */ 76 unsigned long syscall; /* 56 */ 77 unsigned long icountlevel; /* 60 */ 78 unsigned long scompare1; /* 64 */ 79 unsigned long threadptr; /* 68 */ 80 81 /* Additional configurable registers that are used by the compiler. */ 82 xtregs_opt_t xtregs_opt; 83 84 /* Make sure the areg field is 16 bytes aligned. */ 85 int align[0] __attribute__ ((aligned(16))); 86 87 /* current register frame. 88 * Note: The ESF for kernel exceptions ends after 16 registers! 89 */ 90 unsigned long areg[16]; 91 }; 92 93 #include <variant/core.h> 94 95 # define arch_has_single_step() (1) 96 # define task_pt_regs(tsk) ((struct pt_regs*) \ 97 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 98 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 99 # define instruction_pointer(regs) ((regs)->pc) 100 # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \ 101 (regs)->areg[1])) 102 103 # ifndef CONFIG_SMP 104 # define profile_pc(regs) instruction_pointer(regs) 105 # else 106 # define profile_pc(regs) \ 107 ({ \ 108 in_lock_functions(instruction_pointer(regs)) ? \ 109 return_pointer(regs) : instruction_pointer(regs); \ 110 }) 111 # endif 112 113 #define user_stack_pointer(regs) ((regs)->areg[1]) 114 115 #else /* __ASSEMBLY__ */ 116 117 # include <asm/asm-offsets.h> 118 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 119 120 #endif /* !__ASSEMBLY__ */ 121 122 #endif /* _XTENSA_PTRACE_H */ 123