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1da177e4 LT |
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 | |
da80d460 | 16 | * the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c. |
1da177e4 LT |
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 | */ | |
c3617f72 DH |
23 | #ifndef _ASM_POWERPC_PTRACE_H |
24 | #define _ASM_POWERPC_PTRACE_H | |
1da177e4 | 25 | |
c3617f72 | 26 | #include <uapi/asm/ptrace.h> |
1da177e4 | 27 | |
a0987224 | 28 | |
da80d460 SR |
29 | #ifdef __powerpc64__ |
30 | ||
573ebfa6 PM |
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 | ||
da80d460 | 43 | #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ |
ec2b36b9 BH |
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) + \ | |
573ebfa6 | 47 | STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE) |
ec2b36b9 | 48 | #define STACK_FRAME_MARKER 12 |
da80d460 SR |
49 | |
50 | /* Size of dummy stack frame allocated when calling signal handler. */ | |
51 | #define __SIGNAL_FRAMESIZE 128 | |
52 | #define __SIGNAL_FRAMESIZE32 64 | |
53 | ||
54 | #else /* __powerpc64__ */ | |
55 | ||
573ebfa6 PM |
56 | #define USER_REDZONE_SIZE 0 |
57 | #define KERNEL_REDZONE_SIZE 0 | |
da80d460 | 58 | #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */ |
ec2b36b9 BH |
59 | #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */ |
60 | #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773) | |
61 | #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
62 | #define STACK_FRAME_MARKER 2 | |
da80d460 SR |
63 | |
64 | /* Size of stack frame allocated when calling signal handler. */ | |
65 | #define __SIGNAL_FRAMESIZE 64 | |
66 | ||
67 | #endif /* __powerpc64__ */ | |
a0987224 | 68 | |
da80d460 SR |
69 | #ifndef __ASSEMBLY__ |
70 | ||
e6289427 SD |
71 | #define GET_IP(regs) ((regs)->nip) |
72 | #define GET_USP(regs) ((regs)->gpr[1]) | |
73 | #define GET_FP(regs) (0) | |
74 | #define SET_FP(regs, val) | |
75 | ||
76 | #ifdef CONFIG_SMP | |
77 | extern unsigned long profile_pc(struct pt_regs *regs); | |
78 | #define profile_pc profile_pc | |
79 | #endif | |
80 | ||
81 | #include <asm-generic/ptrace.h> | |
82 | ||
359e4284 | 83 | #define kernel_stack_pointer(regs) ((regs)->gpr[1]) |
d7e7528b EP |
84 | static inline int is_syscall_success(struct pt_regs *regs) |
85 | { | |
86 | return !(regs->ccr & 0x10000000); | |
87 | } | |
88 | ||
89 | static inline long regs_return_value(struct pt_regs *regs) | |
90 | { | |
91 | if (is_syscall_success(regs)) | |
92 | return regs->gpr[3]; | |
93 | else | |
94 | return -regs->gpr[3]; | |
95 | } | |
b3f827cb | 96 | |
da80d460 | 97 | #ifdef __powerpc64__ |
1da177e4 | 98 | #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1) |
da80d460 SR |
99 | #else |
100 | #define user_mode(regs) (((regs)->msr & MSR_PR) != 0) | |
101 | #endif | |
1da177e4 LT |
102 | |
103 | #define force_successful_syscall_return() \ | |
da80d460 | 104 | do { \ |
401d1f02 | 105 | set_thread_flag(TIF_NOERROR); \ |
da80d460 | 106 | } while(0) |
1da177e4 | 107 | |
865418d8 | 108 | struct task_struct; |
ee4a3916 AK |
109 | extern int ptrace_get_reg(struct task_struct *task, int regno, |
110 | unsigned long *data); | |
865418d8 BH |
111 | extern int ptrace_put_reg(struct task_struct *task, int regno, |
112 | unsigned long data); | |
113 | ||
be6abfa7 AV |
114 | #define current_pt_regs() \ |
115 | ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1) | |
1da177e4 LT |
116 | /* |
117 | * We use the least-significant bit of the trap field to indicate | |
118 | * whether we have saved the full set of registers, or only a | |
119 | * partial set. A 1 there means the partial set. | |
da80d460 SR |
120 | * On 4xx we use the next bit to indicate whether the exception |
121 | * is a critical exception (1 means it is). | |
1da177e4 LT |
122 | */ |
123 | #define FULL_REGS(regs) (((regs)->trap & 1) == 0) | |
da80d460 | 124 | #ifndef __powerpc64__ |
47c0bd1a BH |
125 | #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) |
126 | #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) | |
663276b7 | 127 | #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0) |
da80d460 | 128 | #endif /* ! __powerpc64__ */ |
1da177e4 | 129 | #define TRAP(regs) ((regs)->trap & ~0xF) |
da80d460 | 130 | #ifdef __powerpc64__ |
a71f5d5d | 131 | #define NV_REG_POISON 0xdeadbeefdeadbeefUL |
1da177e4 | 132 | #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1) |
da80d460 | 133 | #else |
a71f5d5d | 134 | #define NV_REG_POISON 0xdeadbeef |
da80d460 SR |
135 | #define CHECK_FULL_REGS(regs) \ |
136 | do { \ | |
137 | if ((regs)->trap & 1) \ | |
653c0316 | 138 | printk(KERN_CRIT "%s: partial register set\n", __func__); \ |
da80d460 SR |
139 | } while (0) |
140 | #endif /* __powerpc64__ */ | |
a0987224 | 141 | |
2a84b0d7 | 142 | #define arch_has_single_step() (1) |
ec097c84 | 143 | #define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601)) |
25baa35b ON |
144 | #define ARCH_HAS_USER_SINGLE_STEP_INFO |
145 | ||
359e4284 MS |
146 | /* |
147 | * kprobe-based event tracer support | |
148 | */ | |
149 | ||
150 | #include <linux/stddef.h> | |
151 | #include <linux/thread_info.h> | |
152 | extern int regs_query_register_offset(const char *name); | |
153 | extern const char *regs_query_register_name(unsigned int offset); | |
154 | #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr)) | |
155 | ||
156 | /** | |
157 | * regs_get_register() - get register value from its offset | |
158 | * @regs: pt_regs from which register value is gotten | |
159 | * @offset: offset number of the register. | |
160 | * | |
161 | * regs_get_register returns the value of a register whose offset from @regs. | |
162 | * The @offset is the offset of the register in struct pt_regs. | |
163 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. | |
164 | */ | |
165 | static inline unsigned long regs_get_register(struct pt_regs *regs, | |
166 | unsigned int offset) | |
167 | { | |
168 | if (unlikely(offset > MAX_REG_OFFSET)) | |
169 | return 0; | |
170 | return *(unsigned long *)((unsigned long)regs + offset); | |
171 | } | |
172 | ||
173 | /** | |
174 | * regs_within_kernel_stack() - check the address in the stack | |
175 | * @regs: pt_regs which contains kernel stack pointer. | |
176 | * @addr: address which is checked. | |
177 | * | |
178 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). | |
179 | * If @addr is within the kernel stack, it returns true. If not, returns false. | |
180 | */ | |
181 | ||
182 | static inline bool regs_within_kernel_stack(struct pt_regs *regs, | |
183 | unsigned long addr) | |
184 | { | |
185 | return ((addr & ~(THREAD_SIZE - 1)) == | |
186 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); | |
187 | } | |
188 | ||
189 | /** | |
190 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
191 | * @regs: pt_regs which contains kernel stack pointer. | |
192 | * @n: stack entry number. | |
193 | * | |
194 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
195 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, | |
196 | * this returns 0. | |
197 | */ | |
198 | static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, | |
199 | unsigned int n) | |
200 | { | |
201 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); | |
202 | addr += n; | |
203 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) | |
204 | return *addr; | |
205 | else | |
206 | return 0; | |
207 | } | |
208 | ||
a0987224 AB |
209 | #endif /* __ASSEMBLY__ */ |
210 | ||
da80d460 | 211 | #ifndef __powerpc64__ |
da80d460 | 212 | #else /* __powerpc64__ */ |
a0987224 | 213 | #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */ |
1da177e4 LT |
214 | #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */ |
215 | #define PT_VSCR_32 (PT_VR0 + 32*4 + 3) | |
216 | #define PT_VRSAVE_32 (PT_VR0 + 33*4) | |
ce48b210 | 217 | #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */ |
da80d460 | 218 | #endif /* __powerpc64__ */ |
da80d460 | 219 | #endif /* _ASM_POWERPC_PTRACE_H */ |