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 #include <asm/core.h> 48 49 /* 50 * This struct defines the way the registers are stored on the 51 * kernel stack during a system call or other kernel entry. 52 */ 53 struct pt_regs { 54 unsigned long pc; /* 4 */ 55 unsigned long ps; /* 8 */ 56 unsigned long depc; /* 12 */ 57 unsigned long exccause; /* 16 */ 58 unsigned long excvaddr; /* 20 */ 59 unsigned long debugcause; /* 24 */ 60 unsigned long wmask; /* 28 */ 61 unsigned long lbeg; /* 32 */ 62 unsigned long lend; /* 36 */ 63 unsigned long lcount; /* 40 */ 64 unsigned long sar; /* 44 */ 65 unsigned long windowbase; /* 48 */ 66 unsigned long windowstart; /* 52 */ 67 unsigned long syscall; /* 56 */ 68 unsigned long icountlevel; /* 60 */ 69 unsigned long scompare1; /* 64 */ 70 unsigned long threadptr; /* 68 */ 71 72 /* Additional configurable registers that are used by the compiler. */ 73 xtregs_opt_t xtregs_opt; 74 75 /* Make sure the areg field is 16 bytes aligned. */ 76 int align[0] __attribute__ ((aligned(16))); 77 78 /* current register frame. 79 * Note: The ESF for kernel exceptions ends after 16 registers! 80 */ 81 unsigned long areg[XCHAL_NUM_AREGS]; 82 }; 83 84 # define arch_has_single_step() (1) 85 # define task_pt_regs(tsk) ((struct pt_regs*) \ 86 (task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1) 87 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 88 # define instruction_pointer(regs) ((regs)->pc) 89 # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \ 90 (regs)->pc)) 91 92 # ifndef CONFIG_SMP 93 # define profile_pc(regs) instruction_pointer(regs) 94 # else 95 # define profile_pc(regs) \ 96 ({ \ 97 in_lock_functions(instruction_pointer(regs)) ? \ 98 return_pointer(regs) : instruction_pointer(regs); \ 99 }) 100 # endif 101 102 #define user_stack_pointer(regs) ((regs)->areg[1]) 103 regs_return_value(struct pt_regs * regs)104static inline unsigned long regs_return_value(struct pt_regs *regs) 105 { 106 return regs->areg[2]; 107 } 108 109 int do_syscall_trace_enter(struct pt_regs *regs); 110 void do_syscall_trace_leave(struct pt_regs *regs); 111 112 #else /* __ASSEMBLY__ */ 113 114 # include <asm/asm-offsets.h> 115 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 116 117 #endif /* !__ASSEMBLY__ */ 118 119 #endif /* _XTENSA_PTRACE_H */ 120