xref: /openbmc/u-boot/arch/microblaze/include/asm/ptrace.h (revision 83653121d7382fccfe329cb732f77f116341ef1d)
1  /*
2   * include/asm-microblaze/ptrace.h -- Access to CPU registers
3   *
4   *  Copyright (C) 2003       John Williams <jwilliams@itee.uq.edu.au>
5   *  Copyright (C) 2001,2002  NEC Corporation
6   *  Copyright (C) 2001,2002  Miles Bader <miles@gnu.org>
7   *
8   * This file is subject to the terms and conditions of the GNU General
9   * Public License.  See the file COPYING in the main directory of this
10   * archive for more details.
11   *
12   * Written by Miles Bader <miles@gnu.org>
13   * Microblaze port by John Williams
14   */
15  
16  #ifndef __MICROBLAZE_PTRACE_H__
17  #define __MICROBLAZE_PTRACE_H__
18  
19  
20  /* Microblaze general purpose registers with special meanings.  */
21  #define GPR_ZERO	0	/* constant zero */
22  #define GPR_ASM		18	/* reserved for assembler */
23  #define GPR_SP		1	/* stack pointer */
24  #define GPR_GP		2	/* global data pointer */
25  #define GPR_EP		30	/* `element pointer' */
26  #define GPR_LP		15	/* link pointer (current return address) */
27  
28  /* These aren't official names, but they make some code more descriptive.  */
29  #define GPR_ARG0	5
30  #define GPR_ARG1	6
31  #define GPR_ARG2	7
32  #define GPR_ARG3	8
33  #define GPR_ARG4	9
34  #define GPR_ARG5	10
35  #define GPR_RVAL0	3
36  #define GPR_RVAL1	4
37  #define GPR_RVAL	GPR_RVAL0
38  
39  #define NUM_GPRS	32
40  
41  /* `system' registers.  */
42  /* Note these are old v850 values, microblaze has many fewer */
43  #define SR_EIPC		0
44  #define SR_EIPSW	1
45  #define SR_FEPC		2
46  #define SR_FEPSW	3
47  #define SR_ECR		4
48  #define SR_PSW		5
49  #define SR_CTPC		16
50  #define SR_CTPSW	17
51  #define SR_DBPC		18
52  #define SR_DBPSW	19
53  #define SR_CTBP		20
54  #define SR_DIR		21
55  #define SR_ASID		23
56  
57  
58  #ifndef __ASSEMBLY__
59  
60  typedef unsigned long microblaze_reg_t;
61  
62  /* How processor state is stored on the stack during a syscall/signal.
63     If you change this structure, change the associated assembly-language
64     macros below too (PT_*)!  */
65  struct pt_regs
66  {
67  	/* General purpose registers.  */
68  	microblaze_reg_t gpr[NUM_GPRS];
69  
70  	microblaze_reg_t pc;		/* program counter */
71  	microblaze_reg_t psw;		/* program status word */
72  
73  	microblaze_reg_t kernel_mode;	/* 1 if in `kernel mode', 0 if user mode */
74  	microblaze_reg_t single_step;	/* 1 if in single step mode */
75  };
76  
77  
78  #define instruction_pointer(regs)	((regs)->pc)
79  #define user_mode(regs)			(!(regs)->kernel_mode)
80  
81  /* When a struct pt_regs is used to save user state for a system call in
82     the kernel, the system call is stored in the space for R0 (since it's
83     never used otherwise, R0 being a constant 0).  Non-system-calls
84     simply store 0 there.  */
85  #define PT_REGS_SYSCALL(regs)		(regs)->gpr[0]
86  #define PT_REGS_SET_SYSCALL(regs, val)	((regs)->gpr[0] = (val))
87  
88  #endif /* !__ASSEMBLY__ */
89  
90  
91  /* The number of bytes used to store each register.  */
92  #define _PT_REG_SIZE	4
93  
94  /* Offset of a general purpose register in a stuct pt_regs.  */
95  #define PT_GPR(num)	((num) * _PT_REG_SIZE)
96  
97  /* Offsets of various special registers & fields in a struct pt_regs.  */
98  #define NUM_SPECIAL	4
99  #define PT_PC		((NUM_GPRS + 0) * _PT_REG_SIZE)
100  #define PT_PSW		((NUM_GPRS + 1) * _PT_REG_SIZE)
101  #define PT_KERNEL_MODE	((NUM_GPRS + 2) * _PT_REG_SIZE)
102  #define PT_SINGLESTEP	((NUM_GPRS + 3) * _PT_REG_SIZE)
103  
104  #define PT_SYSCALL	PT_GPR(0)
105  
106  /* Size of struct pt_regs, including alignment.  */
107  #define PT_SIZE		((NUM_GPRS + NUM_SPECIAL) * _PT_REG_SIZE)
108  
109  /* These are `magic' values for PTRACE_PEEKUSR that return info about where
110     a process is located in memory.  */
111  #define PT_TEXT_ADDR    (PT_SIZE + 1)
112  #define PT_TEXT_LEN     (PT_SIZE + 2)
113  #define PT_DATA_ADDR    (PT_SIZE + 3)
114  #define PT_DATA_LEN     (PT_SIZE + 4)
115  
116  #endif /* __MICROBLAZE_PTRACE_H__ */
117