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 #ifndef __ASSEMBLY__ 43 44 #include <asm/coprocessor.h> 45 46 /* 47 * This struct defines the way the registers are stored on the 48 * kernel stack during a system call or other kernel entry. 49 */ 50 struct pt_regs { 51 unsigned long pc; /* 4 */ 52 unsigned long ps; /* 8 */ 53 unsigned long depc; /* 12 */ 54 unsigned long exccause; /* 16 */ 55 unsigned long excvaddr; /* 20 */ 56 unsigned long debugcause; /* 24 */ 57 unsigned long wmask; /* 28 */ 58 unsigned long lbeg; /* 32 */ 59 unsigned long lend; /* 36 */ 60 unsigned long lcount; /* 40 */ 61 unsigned long sar; /* 44 */ 62 unsigned long windowbase; /* 48 */ 63 unsigned long windowstart; /* 52 */ 64 unsigned long syscall; /* 56 */ 65 unsigned long icountlevel; /* 60 */ 66 unsigned long scompare1; /* 64 */ 67 unsigned long threadptr; /* 68 */ 68 69 /* Additional configurable registers that are used by the compiler. */ 70 xtregs_opt_t xtregs_opt; 71 72 /* Make sure the areg field is 16 bytes aligned. */ 73 int align[0] __attribute__ ((aligned(16))); 74 75 /* current register frame. 76 * Note: The ESF for kernel exceptions ends after 16 registers! 77 */ 78 unsigned long areg[16]; 79 }; 80 81 #include <variant/core.h> 82 83 # define arch_has_single_step() (1) 84 # define task_pt_regs(tsk) ((struct pt_regs*) \ 85 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 86 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 87 # define instruction_pointer(regs) ((regs)->pc) 88 # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \ 89 (regs)->areg[1])) 90 91 # ifndef CONFIG_SMP 92 # define profile_pc(regs) instruction_pointer(regs) 93 # else 94 # define profile_pc(regs) \ 95 ({ \ 96 in_lock_functions(instruction_pointer(regs)) ? \ 97 return_pointer(regs) : instruction_pointer(regs); \ 98 }) 99 # endif 100 101 #define user_stack_pointer(regs) ((regs)->areg[1]) 102 103 #else /* __ASSEMBLY__ */ 104 105 # include <asm/asm-offsets.h> 106 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 107 108 #endif /* !__ASSEMBLY__ */ 109 110 #endif /* _XTENSA_PTRACE_H */ 111