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| 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 __ASSEMBLER__ |
| 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 | /* current register frame. |
| 76 | * Note: The ESF for kernel exceptions ends after 16 registers! |
| 77 | */ |
| 78 | unsigned long areg[XCHAL_NUM_AREGS] __aligned(16); |
| 79 | }; |
| 80 | |
| 81 | # define arch_has_single_step() (1) |
| 82 | # define task_pt_regs(tsk) ((struct pt_regs*) \ |
| 83 | (task_stack_page(tsk) + KERNEL_STACK_SIZE) - 1) |
| 84 | # define user_mode(regs) (((regs)->ps & 0x00000020)!=0) |
| 85 | # define instruction_pointer(regs) ((regs)->pc) |
| 86 | # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \ |
| 87 | (regs)->pc)) |
| 88 | |
| 89 | # ifndef CONFIG_SMP |
| 90 | # define profile_pc(regs) instruction_pointer(regs) |
| 91 | # else |
| 92 | # define profile_pc(regs) \ |
| 93 | ({ \ |
| 94 | in_lock_functions(instruction_pointer(regs)) ? \ |
| 95 | return_pointer(regs) : instruction_pointer(regs); \ |
| 96 | }) |
| 97 | # endif |
| 98 | |
| 99 | #define user_stack_pointer(regs) ((regs)->areg[1]) |
| 100 | |
| 101 | static inline unsigned long regs_return_value(struct pt_regs *regs) |
| 102 | { |
| 103 | return regs->areg[2]; |
| 104 | } |
| 105 | |
| 106 | int do_syscall_trace_enter(struct pt_regs *regs); |
| 107 | void do_syscall_trace_leave(struct pt_regs *regs); |
| 108 | |
| 109 | #else /* __ASSEMBLER__ */ |
| 110 | |
| 111 | # include <asm/asm-offsets.h> |
| 112 | #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) |
| 113 | |
| 114 | #endif /* !__ASSEMBLER__ */ |
| 115 | |
| 116 | #endif /* _XTENSA_PTRACE_H */ |
| 117 |
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