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Linux/arch/powerpc/include/asm/ptrace.h

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  1 /*
  2  * Copyright (C) 2001 PPC64 Team, IBM Corp
  3  *
  4  * This struct defines the way the registers are stored on the
  5  * kernel stack during a system call or other kernel entry.
  6  *
  7  * this should only contain volatile regs
  8  * since we can keep non-volatile in the thread_struct
  9  * should set this up when only volatiles are saved
 10  * by intr code.
 11  *
 12  * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
 13  * that the overall structure is a multiple of 16 bytes in length.
 14  *
 15  * Note that the offsets of the fields in this struct correspond with
 16  * the PT_* values below.  This simplifies arch/powerpc/kernel/ptrace.c.
 17  *
 18  * This program is free software; you can redistribute it and/or
 19  * modify it under the terms of the GNU General Public License
 20  * as published by the Free Software Foundation; either version
 21  * 2 of the License, or (at your option) any later version.
 22  */
 23 #ifndef _ASM_POWERPC_PTRACE_H
 24 #define _ASM_POWERPC_PTRACE_H
 25 
 26 #include <uapi/asm/ptrace.h>
 27 
 28 
 29 #ifdef __powerpc64__
 30 
 31 /*
 32  * Size of redzone that userspace is allowed to use below the stack
 33  * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
 34  * the new ELFv2 little-endian ABI, so we allow the larger amount.
 35  *
 36  * For kernel code we allow a 288-byte redzone, in order to conserve
 37  * kernel stack space; gcc currently only uses 288 bytes, and will
 38  * hopefully allow explicit control of the redzone size in future.
 39  */
 40 #define USER_REDZONE_SIZE       512
 41 #define KERNEL_REDZONE_SIZE     288
 42 
 43 #define STACK_FRAME_OVERHEAD    112     /* size of minimum stack frame */
 44 #define STACK_FRAME_LR_SAVE     2       /* Location of LR in stack frame */
 45 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
 46 #define STACK_INT_FRAME_SIZE    (sizeof(struct pt_regs) + \
 47                                  STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
 48 #define STACK_FRAME_MARKER      12
 49 
 50 #if defined(_CALL_ELF) && _CALL_ELF == 2
 51 #define STACK_FRAME_MIN_SIZE    32
 52 #else
 53 #define STACK_FRAME_MIN_SIZE    STACK_FRAME_OVERHEAD
 54 #endif
 55 
 56 /* Size of dummy stack frame allocated when calling signal handler. */
 57 #define __SIGNAL_FRAMESIZE      128
 58 #define __SIGNAL_FRAMESIZE32    64
 59 
 60 #else /* __powerpc64__ */
 61 
 62 #define USER_REDZONE_SIZE       0
 63 #define KERNEL_REDZONE_SIZE     0
 64 #define STACK_FRAME_OVERHEAD    16      /* size of minimum stack frame */
 65 #define STACK_FRAME_LR_SAVE     1       /* Location of LR in stack frame */
 66 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
 67 #define STACK_INT_FRAME_SIZE    (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
 68 #define STACK_FRAME_MARKER      2
 69 #define STACK_FRAME_MIN_SIZE    STACK_FRAME_OVERHEAD
 70 
 71 /* Size of stack frame allocated when calling signal handler. */
 72 #define __SIGNAL_FRAMESIZE      64
 73 
 74 #endif /* __powerpc64__ */
 75 
 76 #ifndef __ASSEMBLY__
 77 
 78 #define GET_IP(regs)            ((regs)->nip)
 79 #define GET_USP(regs)           ((regs)->gpr[1])
 80 #define GET_FP(regs)            (0)
 81 #define SET_FP(regs, val)
 82 
 83 #ifdef CONFIG_SMP
 84 extern unsigned long profile_pc(struct pt_regs *regs);
 85 #define profile_pc profile_pc
 86 #endif
 87 
 88 #include <asm-generic/ptrace.h>
 89 
 90 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
 91 static inline int is_syscall_success(struct pt_regs *regs)
 92 {
 93         return !(regs->ccr & 0x10000000);
 94 }
 95 
 96 static inline long regs_return_value(struct pt_regs *regs)
 97 {
 98         if (is_syscall_success(regs))
 99                 return regs->gpr[3];
100         else
101                 return -regs->gpr[3];
102 }
103 
104 #ifdef __powerpc64__
105 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
106 #else
107 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
108 #endif
109 
110 #define force_successful_syscall_return()   \
111         do { \
112                 set_thread_flag(TIF_NOERROR); \
113         } while(0)
114 
115 struct task_struct;
116 extern int ptrace_get_reg(struct task_struct *task, int regno,
117                           unsigned long *data);
118 extern int ptrace_put_reg(struct task_struct *task, int regno,
119                           unsigned long data);
120 
121 #define current_pt_regs() \
122         ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1)
123 /*
124  * We use the least-significant bit of the trap field to indicate
125  * whether we have saved the full set of registers, or only a
126  * partial set.  A 1 there means the partial set.
127  * On 4xx we use the next bit to indicate whether the exception
128  * is a critical exception (1 means it is).
129  */
130 #define FULL_REGS(regs)         (((regs)->trap & 1) == 0)
131 #ifndef __powerpc64__
132 #define IS_CRITICAL_EXC(regs)   (((regs)->trap & 2) != 0)
133 #define IS_MCHECK_EXC(regs)     (((regs)->trap & 4) != 0)
134 #define IS_DEBUG_EXC(regs)      (((regs)->trap & 8) != 0)
135 #endif /* ! __powerpc64__ */
136 #define TRAP(regs)              ((regs)->trap & ~0xF)
137 #ifdef __powerpc64__
138 #define NV_REG_POISON           0xdeadbeefdeadbeefUL
139 #define CHECK_FULL_REGS(regs)   BUG_ON(regs->trap & 1)
140 #else
141 #define NV_REG_POISON           0xdeadbeef
142 #define CHECK_FULL_REGS(regs)                                                 \
143 do {                                                                          \
144         if ((regs)->trap & 1)                                                 \
145                 printk(KERN_CRIT "%s: partial register set\n", __func__); \
146 } while (0)
147 #endif /* __powerpc64__ */
148 
149 #define arch_has_single_step()  (1)
150 #define arch_has_block_step()   (!cpu_has_feature(CPU_FTR_601))
151 #define ARCH_HAS_USER_SINGLE_STEP_INFO
152 
153 /*
154  * kprobe-based event tracer support
155  */
156 
157 #include <linux/stddef.h>
158 #include <linux/thread_info.h>
159 extern int regs_query_register_offset(const char *name);
160 extern const char *regs_query_register_name(unsigned int offset);
161 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
162 
163 /**
164  * regs_get_register() - get register value from its offset
165  * @regs:          pt_regs from which register value is gotten
166  * @offset:    offset number of the register.
167  *
168  * regs_get_register returns the value of a register whose offset from @regs.
169  * The @offset is the offset of the register in struct pt_regs.
170  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
171  */
172 static inline unsigned long regs_get_register(struct pt_regs *regs,
173                                                 unsigned int offset)
174 {
175         if (unlikely(offset > MAX_REG_OFFSET))
176                 return 0;
177         return *(unsigned long *)((unsigned long)regs + offset);
178 }
179 
180 /**
181  * regs_within_kernel_stack() - check the address in the stack
182  * @regs:      pt_regs which contains kernel stack pointer.
183  * @addr:      address which is checked.
184  *
185  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
186  * If @addr is within the kernel stack, it returns true. If not, returns false.
187  */
188 
189 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
190                                                 unsigned long addr)
191 {
192         return ((addr & ~(THREAD_SIZE - 1))  ==
193                 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
194 }
195 
196 /**
197  * regs_get_kernel_stack_nth() - get Nth entry of the stack
198  * @regs:       pt_regs which contains kernel stack pointer.
199  * @n:          stack entry number.
200  *
201  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
202  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
203  * this returns 0.
204  */
205 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
206                                                       unsigned int n)
207 {
208         unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
209         addr += n;
210         if (regs_within_kernel_stack(regs, (unsigned long)addr))
211                 return *addr;
212         else
213                 return 0;
214 }
215 
216 #endif /* __ASSEMBLY__ */
217 
218 #ifndef __powerpc64__
219 #else /* __powerpc64__ */
220 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
221 #define PT_VR0_32 164   /* each Vector reg occupies 4 slots in 32-bit */
222 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
223 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
224 #define PT_VSR0_32 300  /* each VSR reg occupies 4 slots in 32-bit */
225 #endif /* __powerpc64__ */
226 #endif /* _ASM_POWERPC_PTRACE_H */
227 

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