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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> |
ec0c464c | 27 | #include <asm/asm-const.h> |
1da177e4 | 28 | |
002af939 ME |
29 | #ifndef __ASSEMBLY__ |
30 | struct pt_regs | |
31 | { | |
32 | union { | |
33 | struct user_pt_regs user_regs; | |
34 | struct { | |
35 | unsigned long gpr[32]; | |
36 | unsigned long nip; | |
37 | unsigned long msr; | |
38 | unsigned long orig_gpr3; | |
39 | unsigned long ctr; | |
40 | unsigned long link; | |
41 | unsigned long xer; | |
42 | unsigned long ccr; | |
43 | #ifdef CONFIG_PPC64 | |
44 | unsigned long softe; | |
45 | #else | |
46 | unsigned long mq; | |
47 | #endif | |
48 | unsigned long trap; | |
49 | unsigned long dar; | |
50 | unsigned long dsisr; | |
51 | unsigned long result; | |
52 | }; | |
53 | }; | |
4c2de74c | 54 | |
de78a9c4 CL |
55 | union { |
56 | struct { | |
4c2de74c | 57 | #ifdef CONFIG_PPC64 |
de78a9c4 CL |
58 | unsigned long ppr; |
59 | #endif | |
60 | #ifdef CONFIG_PPC_KUAP | |
61 | unsigned long kuap; | |
4c2de74c | 62 | #endif |
de78a9c4 CL |
63 | }; |
64 | unsigned long __pad[2]; /* Maintain 16 byte interrupt stack alignment */ | |
65 | }; | |
002af939 ME |
66 | }; |
67 | #endif | |
a0987224 | 68 | |
da80d460 SR |
69 | #ifdef __powerpc64__ |
70 | ||
573ebfa6 PM |
71 | /* |
72 | * Size of redzone that userspace is allowed to use below the stack | |
73 | * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in | |
74 | * the new ELFv2 little-endian ABI, so we allow the larger amount. | |
75 | * | |
76 | * For kernel code we allow a 288-byte redzone, in order to conserve | |
77 | * kernel stack space; gcc currently only uses 288 bytes, and will | |
78 | * hopefully allow explicit control of the redzone size in future. | |
79 | */ | |
80 | #define USER_REDZONE_SIZE 512 | |
81 | #define KERNEL_REDZONE_SIZE 288 | |
82 | ||
da80d460 | 83 | #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ |
ec2b36b9 BH |
84 | #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */ |
85 | #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265) | |
86 | #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \ | |
573ebfa6 | 87 | STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE) |
ec2b36b9 | 88 | #define STACK_FRAME_MARKER 12 |
da80d460 | 89 | |
f55d9665 | 90 | #ifdef PPC64_ELF_ABI_v2 |
85101af1 AB |
91 | #define STACK_FRAME_MIN_SIZE 32 |
92 | #else | |
93 | #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD | |
94 | #endif | |
95 | ||
da80d460 SR |
96 | /* Size of dummy stack frame allocated when calling signal handler. */ |
97 | #define __SIGNAL_FRAMESIZE 128 | |
98 | #define __SIGNAL_FRAMESIZE32 64 | |
99 | ||
100 | #else /* __powerpc64__ */ | |
101 | ||
573ebfa6 PM |
102 | #define USER_REDZONE_SIZE 0 |
103 | #define KERNEL_REDZONE_SIZE 0 | |
da80d460 | 104 | #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */ |
ec2b36b9 BH |
105 | #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */ |
106 | #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773) | |
107 | #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
108 | #define STACK_FRAME_MARKER 2 | |
85101af1 | 109 | #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD |
da80d460 SR |
110 | |
111 | /* Size of stack frame allocated when calling signal handler. */ | |
112 | #define __SIGNAL_FRAMESIZE 64 | |
113 | ||
114 | #endif /* __powerpc64__ */ | |
a0987224 | 115 | |
da80d460 SR |
116 | #ifndef __ASSEMBLY__ |
117 | ||
e6289427 SD |
118 | #define GET_IP(regs) ((regs)->nip) |
119 | #define GET_USP(regs) ((regs)->gpr[1]) | |
120 | #define GET_FP(regs) (0) | |
121 | #define SET_FP(regs, val) | |
122 | ||
123 | #ifdef CONFIG_SMP | |
124 | extern unsigned long profile_pc(struct pt_regs *regs); | |
125 | #define profile_pc profile_pc | |
126 | #endif | |
127 | ||
128 | #include <asm-generic/ptrace.h> | |
129 | ||
359e4284 | 130 | #define kernel_stack_pointer(regs) ((regs)->gpr[1]) |
d7e7528b EP |
131 | static inline int is_syscall_success(struct pt_regs *regs) |
132 | { | |
133 | return !(regs->ccr & 0x10000000); | |
134 | } | |
135 | ||
136 | static inline long regs_return_value(struct pt_regs *regs) | |
137 | { | |
138 | if (is_syscall_success(regs)) | |
139 | return regs->gpr[3]; | |
140 | else | |
141 | return -regs->gpr[3]; | |
142 | } | |
b3f827cb | 143 | |
7cd01b08 NR |
144 | static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc) |
145 | { | |
146 | regs->gpr[3] = rc; | |
147 | } | |
148 | ||
da80d460 | 149 | #ifdef __powerpc64__ |
1da177e4 | 150 | #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1) |
da80d460 SR |
151 | #else |
152 | #define user_mode(regs) (((regs)->msr & MSR_PR) != 0) | |
153 | #endif | |
1da177e4 LT |
154 | |
155 | #define force_successful_syscall_return() \ | |
da80d460 | 156 | do { \ |
401d1f02 | 157 | set_thread_flag(TIF_NOERROR); \ |
da80d460 | 158 | } while(0) |
1da177e4 | 159 | |
865418d8 | 160 | struct task_struct; |
ee4a3916 AK |
161 | extern int ptrace_get_reg(struct task_struct *task, int regno, |
162 | unsigned long *data); | |
865418d8 BH |
163 | extern int ptrace_put_reg(struct task_struct *task, int regno, |
164 | unsigned long data); | |
165 | ||
be6abfa7 | 166 | #define current_pt_regs() \ |
b72cc2e7 | 167 | ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1) |
1da177e4 LT |
168 | /* |
169 | * We use the least-significant bit of the trap field to indicate | |
170 | * whether we have saved the full set of registers, or only a | |
171 | * partial set. A 1 there means the partial set. | |
da80d460 SR |
172 | * On 4xx we use the next bit to indicate whether the exception |
173 | * is a critical exception (1 means it is). | |
1da177e4 LT |
174 | */ |
175 | #define FULL_REGS(regs) (((regs)->trap & 1) == 0) | |
da80d460 | 176 | #ifndef __powerpc64__ |
47c0bd1a BH |
177 | #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) |
178 | #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) | |
663276b7 | 179 | #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0) |
da80d460 | 180 | #endif /* ! __powerpc64__ */ |
1da177e4 | 181 | #define TRAP(regs) ((regs)->trap & ~0xF) |
da80d460 | 182 | #ifdef __powerpc64__ |
a71f5d5d | 183 | #define NV_REG_POISON 0xdeadbeefdeadbeefUL |
1da177e4 | 184 | #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1) |
da80d460 | 185 | #else |
a71f5d5d | 186 | #define NV_REG_POISON 0xdeadbeef |
da80d460 SR |
187 | #define CHECK_FULL_REGS(regs) \ |
188 | do { \ | |
189 | if ((regs)->trap & 1) \ | |
653c0316 | 190 | printk(KERN_CRIT "%s: partial register set\n", __func__); \ |
da80d460 SR |
191 | } while (0) |
192 | #endif /* __powerpc64__ */ | |
a0987224 | 193 | |
2a84b0d7 | 194 | #define arch_has_single_step() (1) |
ec097c84 | 195 | #define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601)) |
efc463ad | 196 | #define ARCH_HAS_USER_SINGLE_STEP_REPORT |
25baa35b | 197 | |
359e4284 MS |
198 | /* |
199 | * kprobe-based event tracer support | |
200 | */ | |
201 | ||
202 | #include <linux/stddef.h> | |
203 | #include <linux/thread_info.h> | |
204 | extern int regs_query_register_offset(const char *name); | |
205 | extern const char *regs_query_register_name(unsigned int offset); | |
206 | #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr)) | |
207 | ||
208 | /** | |
209 | * regs_get_register() - get register value from its offset | |
210 | * @regs: pt_regs from which register value is gotten | |
211 | * @offset: offset number of the register. | |
212 | * | |
213 | * regs_get_register returns the value of a register whose offset from @regs. | |
214 | * The @offset is the offset of the register in struct pt_regs. | |
215 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. | |
216 | */ | |
217 | static inline unsigned long regs_get_register(struct pt_regs *regs, | |
218 | unsigned int offset) | |
219 | { | |
220 | if (unlikely(offset > MAX_REG_OFFSET)) | |
221 | return 0; | |
222 | return *(unsigned long *)((unsigned long)regs + offset); | |
223 | } | |
224 | ||
225 | /** | |
226 | * regs_within_kernel_stack() - check the address in the stack | |
227 | * @regs: pt_regs which contains kernel stack pointer. | |
228 | * @addr: address which is checked. | |
229 | * | |
230 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). | |
231 | * If @addr is within the kernel stack, it returns true. If not, returns false. | |
232 | */ | |
233 | ||
234 | static inline bool regs_within_kernel_stack(struct pt_regs *regs, | |
235 | unsigned long addr) | |
236 | { | |
237 | return ((addr & ~(THREAD_SIZE - 1)) == | |
238 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); | |
239 | } | |
240 | ||
241 | /** | |
242 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
243 | * @regs: pt_regs which contains kernel stack pointer. | |
244 | * @n: stack entry number. | |
245 | * | |
246 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
247 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, | |
248 | * this returns 0. | |
249 | */ | |
250 | static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, | |
251 | unsigned int n) | |
252 | { | |
253 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); | |
254 | addr += n; | |
255 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) | |
256 | return *addr; | |
257 | else | |
258 | return 0; | |
259 | } | |
260 | ||
a0987224 AB |
261 | #endif /* __ASSEMBLY__ */ |
262 | ||
da80d460 | 263 | #ifndef __powerpc64__ |
da80d460 | 264 | #else /* __powerpc64__ */ |
a0987224 | 265 | #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */ |
1da177e4 LT |
266 | #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */ |
267 | #define PT_VSCR_32 (PT_VR0 + 32*4 + 3) | |
268 | #define PT_VRSAVE_32 (PT_VR0 + 33*4) | |
ce48b210 | 269 | #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */ |
da80d460 | 270 | #endif /* __powerpc64__ */ |
da80d460 | 271 | #endif /* _ASM_POWERPC_PTRACE_H */ |