1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2001 - 2007 Tensilica Inc.
6 #ifndef _XTENSA_PTRACE_H
7 #define _XTENSA_PTRACE_H
14 * +-----------------------+ -------- STACK_SIZE
16 * +-----------------------+ |
17 * | struct pt_regs | |
18 * +-----------------------+ | ------ PT_REGS_OFFSET
19 * double : 16 bytes spill area : | ^
20 * exception :- - - - - - - - - - - -: | |
21 * frame : struct pt_regs : | |
22 * :- - - - - - - - - - - -: | |
24 * | memory stack | | |
30 * +-----------------------+ | | --- STACK_BIAS
31 * | struct task_struct | | | ^
32 * current --> +-----------------------+ | | |
33 * | struct thread_info | | | |
34 * +-----------------------+ --------
37 #define KERNEL_STACK_SIZE (2 * PAGE_SIZE)
39 /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */
41 #define EXC_TABLE_KSTK 0x004 /* Kernel Stack */
42 #define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */
43 #define EXC_TABLE_FIXUP 0x00c /* Fixup handler */
44 #define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */
45 #define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */
46 #define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */
47 #define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */
48 #define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */
49 #define EXC_TABLE_SIZE 0x400
51 /* Registers used by strace */
53 #define REG_A_BASE 0xfc000000
54 #define REG_AR_BASE 0x04000000
55 #define REG_PC 0x14000000
56 #define REG_PS 0x080000e6
57 #define REG_WB 0x08000048
58 #define REG_WS 0x08000049
59 #define REG_LBEG 0x08000000
60 #define REG_LEND 0x08000001
61 #define REG_LCOUNT 0x08000002
62 #define REG_SAR 0x08000003
63 #define REG_DEPC 0x080000c0
64 #define REG_EXCCAUSE 0x080000e8
65 #define REG_EXCVADDR 0x080000ee
66 #define SYSCALL_NR 0x1
68 #define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1)
70 /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
72 #define PTRACE_GETREGS 12
73 #define PTRACE_SETREGS 13
74 #define PTRACE_GETFPREGS 14
75 #define PTRACE_SETFPREGS 15
76 #define PTRACE_GETFPREGSIZE 18
81 * This struct defines the way the registers are stored on the
82 * kernel stack during a system call or other kernel entry.
85 unsigned long pc; /* 4 */
86 unsigned long ps; /* 8 */
87 unsigned long depc; /* 12 */
88 unsigned long exccause; /* 16 */
89 unsigned long excvaddr; /* 20 */
90 unsigned long debugcause; /* 24 */
91 unsigned long wmask; /* 28 */
92 unsigned long lbeg; /* 32 */
93 unsigned long lend; /* 36 */
94 unsigned long lcount; /* 40 */
95 unsigned long sar; /* 44 */
96 unsigned long windowbase; /* 48 */
97 unsigned long windowstart; /* 52 */
98 unsigned long syscall; /* 56 */
99 unsigned long icountlevel; /* 60 */
100 int reserved[1]; /* 64 */
102 /* Make sure the areg field is 16 bytes aligned */
103 int align[0] __aligned(16);
105 /* current register frame.
106 * Note: The ESF for kernel exceptions ends after 16 registers!
108 unsigned long areg[16]; /* 128 (64) */
113 # define task_pt_regs(tsk) ((struct pt_regs *) \
114 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1)
115 # define user_mode(regs) (((regs)->ps & 0x00000020) != 0)
116 # define instruction_pointer(regs) ((regs)->pc)
117 void show_regs(struct pt_regs *);
120 # define profile_pc(regs) instruction_pointer(regs)
122 #endif /* __KERNEL__ */
124 #else /* __ASSEMBLY__ */
127 # include <asm/asm-offsets.h>
128 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE)
131 #endif /* !__ASSEMBLY__ */
132 #endif /* _XTENSA_PTRACE_H */