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#define NO_SYSCALL (-1) 43 44#ifndef __ASSEMBLY__ 45 46#include <asm/coprocessor.h> 47 48/* 49 * This struct defines the way the registers are stored on the 50 * kernel stack during a system call or other kernel entry. 51 */ 52struct pt_regs { 53 unsigned long pc; /* 4 */ 54 unsigned long ps; /* 8 */ 55 unsigned long depc; /* 12 */ 56 unsigned long exccause; /* 16 */ 57 unsigned long excvaddr; /* 20 */ 58 unsigned long debugcause; /* 24 */ 59 unsigned long wmask; /* 28 */ 60 unsigned long lbeg; /* 32 */ 61 unsigned long lend; /* 36 */ 62 unsigned long lcount; /* 40 */ 63 unsigned long sar; /* 44 */ 64 unsigned long windowbase; /* 48 */ 65 unsigned long windowstart; /* 52 */ 66 unsigned long syscall; /* 56 */ 67 unsigned long icountlevel; /* 60 */ 68 unsigned long scompare1; /* 64 */ 69 unsigned long threadptr; /* 68 */ 70 71 /* Additional configurable registers that are used by the compiler. */ 72 xtregs_opt_t xtregs_opt; 73 74 /* Make sure the areg field is 16 bytes aligned. */ 75 int align[0] __attribute__ ((aligned(16))); 76 77 /* current register frame. 78 * Note: The ESF for kernel exceptions ends after 16 registers! 79 */ 80 unsigned long areg[16]; 81}; 82 83#include <asm/core.h> 84 85# define arch_has_single_step() (1) 86# define task_pt_regs(tsk) ((struct pt_regs*) \ 87 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 88# define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 89# define instruction_pointer(regs) ((regs)->pc) 90# define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \ 91 (regs)->areg[1])) 92 93# ifndef CONFIG_SMP 94# define profile_pc(regs) instruction_pointer(regs) 95# else 96# define profile_pc(regs) \ 97 ({ \ 98 in_lock_functions(instruction_pointer(regs)) ? \ 99 return_pointer(regs) : instruction_pointer(regs); \ 100 }) 101# endif 102 103#define user_stack_pointer(regs) ((regs)->areg[1]) 104 105static inline unsigned long regs_return_value(struct pt_regs *regs) 106{ 107 return regs->areg[2]; 108} 109 110#else /* __ASSEMBLY__ */ 111 112# include <asm/asm-offsets.h> 113#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 114 115#endif /* !__ASSEMBLY__ */ 116 117#endif /* _XTENSA_PTRACE_H */ 118