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 */
52 struct 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
105 static 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 */