2 * include/asm-xtensa/ptrace.h
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
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
10 #ifndef _XTENSA_PTRACE_H
11 #define _XTENSA_PTRACE_H
13 #include <asm/kmem_layout.h>
14 #include <uapi/asm/ptrace.h>
19 * +-----------------------+ -------- STACK_SIZE
21 * +-----------------------+ |
22 * | struct pt_regs | |
23 * +-----------------------+ | ------ PT_REGS_OFFSET
24 * double : 16 bytes spill area : | ^
25 * excetion :- - - - - - - - - - - -: | |
26 * frame : struct pt_regs : | |
27 * :- - - - - - - - - - - -: | |
29 * | memory stack | | |
35 * +-----------------------+ | | --- STACK_BIAS
36 * | struct task_struct | | | ^
37 * current --> +-----------------------+ | | |
38 * | struct thread_info | | | |
39 * +-----------------------+ --------
42 #define NO_SYSCALL (-1)
46 #include <asm/coprocessor.h>
50 * This struct defines the way the registers are stored on the
51 * kernel stack during a system call or other kernel entry.
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 */
72 /* Additional configurable registers that are used by the compiler. */
73 xtregs_opt_t xtregs_opt;
75 /* Make sure the areg field is 16 bytes aligned. */
76 int align[0] __attribute__ ((aligned(16)));
78 /* current register frame.
79 * Note: The ESF for kernel exceptions ends after 16 registers!
81 unsigned long areg[XCHAL_NUM_AREGS];
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], \
93 # define profile_pc(regs) instruction_pointer(regs)
95 # define profile_pc(regs) \
97 in_lock_functions(instruction_pointer(regs)) ? \
98 return_pointer(regs) : instruction_pointer(regs); \
102 #define user_stack_pointer(regs) ((regs)->areg[1])
104 static inline unsigned long regs_return_value(struct pt_regs *regs)
106 return regs->areg[2];
109 #else /* __ASSEMBLY__ */
111 # include <asm/asm-offsets.h>
112 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
114 #endif /* !__ASSEMBLY__ */
116 #endif /* _XTENSA_PTRACE_H */