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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 | ||
31 | #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ | |
ec2b36b9 BH |
32 | #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */ |
33 | #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265) | |
34 | #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \ | |
35 | STACK_FRAME_OVERHEAD + 288) | |
36 | #define STACK_FRAME_MARKER 12 | |
da80d460 SR |
37 | |
38 | /* Size of dummy stack frame allocated when calling signal handler. */ | |
39 | #define __SIGNAL_FRAMESIZE 128 | |
40 | #define __SIGNAL_FRAMESIZE32 64 | |
41 | ||
42 | #else /* __powerpc64__ */ | |
43 | ||
44 | #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */ | |
ec2b36b9 BH |
45 | #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */ |
46 | #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773) | |
47 | #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD) | |
48 | #define STACK_FRAME_MARKER 2 | |
da80d460 SR |
49 | |
50 | /* Size of stack frame allocated when calling signal handler. */ | |
51 | #define __SIGNAL_FRAMESIZE 64 | |
52 | ||
53 | #endif /* __powerpc64__ */ | |
a0987224 | 54 | |
da80d460 SR |
55 | #ifndef __ASSEMBLY__ |
56 | ||
e6289427 SD |
57 | #define GET_IP(regs) ((regs)->nip) |
58 | #define GET_USP(regs) ((regs)->gpr[1]) | |
59 | #define GET_FP(regs) (0) | |
60 | #define SET_FP(regs, val) | |
61 | ||
62 | #ifdef CONFIG_SMP | |
63 | extern unsigned long profile_pc(struct pt_regs *regs); | |
64 | #define profile_pc profile_pc | |
65 | #endif | |
66 | ||
67 | #include <asm-generic/ptrace.h> | |
68 | ||
359e4284 | 69 | #define kernel_stack_pointer(regs) ((regs)->gpr[1]) |
d7e7528b EP |
70 | static inline int is_syscall_success(struct pt_regs *regs) |
71 | { | |
72 | return !(regs->ccr & 0x10000000); | |
73 | } | |
74 | ||
75 | static inline long regs_return_value(struct pt_regs *regs) | |
76 | { | |
77 | if (is_syscall_success(regs)) | |
78 | return regs->gpr[3]; | |
79 | else | |
80 | return -regs->gpr[3]; | |
81 | } | |
b3f827cb | 82 | |
da80d460 | 83 | #ifdef __powerpc64__ |
1da177e4 | 84 | #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1) |
da80d460 SR |
85 | #else |
86 | #define user_mode(regs) (((regs)->msr & MSR_PR) != 0) | |
87 | #endif | |
1da177e4 LT |
88 | |
89 | #define force_successful_syscall_return() \ | |
da80d460 | 90 | do { \ |
401d1f02 | 91 | set_thread_flag(TIF_NOERROR); \ |
da80d460 | 92 | } while(0) |
1da177e4 | 93 | |
865418d8 BH |
94 | struct task_struct; |
95 | extern unsigned long ptrace_get_reg(struct task_struct *task, int regno); | |
96 | extern int ptrace_put_reg(struct task_struct *task, int regno, | |
97 | unsigned long data); | |
98 | ||
be6abfa7 AV |
99 | #define current_pt_regs() \ |
100 | ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE) - 1) | |
1da177e4 LT |
101 | /* |
102 | * We use the least-significant bit of the trap field to indicate | |
103 | * whether we have saved the full set of registers, or only a | |
104 | * partial set. A 1 there means the partial set. | |
da80d460 SR |
105 | * On 4xx we use the next bit to indicate whether the exception |
106 | * is a critical exception (1 means it is). | |
1da177e4 LT |
107 | */ |
108 | #define FULL_REGS(regs) (((regs)->trap & 1) == 0) | |
da80d460 | 109 | #ifndef __powerpc64__ |
47c0bd1a BH |
110 | #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) |
111 | #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) | |
663276b7 | 112 | #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0) |
da80d460 | 113 | #endif /* ! __powerpc64__ */ |
1da177e4 | 114 | #define TRAP(regs) ((regs)->trap & ~0xF) |
da80d460 | 115 | #ifdef __powerpc64__ |
a71f5d5d | 116 | #define NV_REG_POISON 0xdeadbeefdeadbeefUL |
1da177e4 | 117 | #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1) |
da80d460 | 118 | #else |
a71f5d5d | 119 | #define NV_REG_POISON 0xdeadbeef |
da80d460 SR |
120 | #define CHECK_FULL_REGS(regs) \ |
121 | do { \ | |
122 | if ((regs)->trap & 1) \ | |
653c0316 | 123 | printk(KERN_CRIT "%s: partial register set\n", __func__); \ |
da80d460 SR |
124 | } while (0) |
125 | #endif /* __powerpc64__ */ | |
a0987224 | 126 | |
2a84b0d7 | 127 | #define arch_has_single_step() (1) |
ec097c84 | 128 | #define arch_has_block_step() (!cpu_has_feature(CPU_FTR_601)) |
25baa35b ON |
129 | #define ARCH_HAS_USER_SINGLE_STEP_INFO |
130 | ||
359e4284 MS |
131 | /* |
132 | * kprobe-based event tracer support | |
133 | */ | |
134 | ||
135 | #include <linux/stddef.h> | |
136 | #include <linux/thread_info.h> | |
137 | extern int regs_query_register_offset(const char *name); | |
138 | extern const char *regs_query_register_name(unsigned int offset); | |
139 | #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr)) | |
140 | ||
141 | /** | |
142 | * regs_get_register() - get register value from its offset | |
143 | * @regs: pt_regs from which register value is gotten | |
144 | * @offset: offset number of the register. | |
145 | * | |
146 | * regs_get_register returns the value of a register whose offset from @regs. | |
147 | * The @offset is the offset of the register in struct pt_regs. | |
148 | * If @offset is bigger than MAX_REG_OFFSET, this returns 0. | |
149 | */ | |
150 | static inline unsigned long regs_get_register(struct pt_regs *regs, | |
151 | unsigned int offset) | |
152 | { | |
153 | if (unlikely(offset > MAX_REG_OFFSET)) | |
154 | return 0; | |
155 | return *(unsigned long *)((unsigned long)regs + offset); | |
156 | } | |
157 | ||
158 | /** | |
159 | * regs_within_kernel_stack() - check the address in the stack | |
160 | * @regs: pt_regs which contains kernel stack pointer. | |
161 | * @addr: address which is checked. | |
162 | * | |
163 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). | |
164 | * If @addr is within the kernel stack, it returns true. If not, returns false. | |
165 | */ | |
166 | ||
167 | static inline bool regs_within_kernel_stack(struct pt_regs *regs, | |
168 | unsigned long addr) | |
169 | { | |
170 | return ((addr & ~(THREAD_SIZE - 1)) == | |
171 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); | |
172 | } | |
173 | ||
174 | /** | |
175 | * regs_get_kernel_stack_nth() - get Nth entry of the stack | |
176 | * @regs: pt_regs which contains kernel stack pointer. | |
177 | * @n: stack entry number. | |
178 | * | |
179 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which | |
180 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, | |
181 | * this returns 0. | |
182 | */ | |
183 | static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, | |
184 | unsigned int n) | |
185 | { | |
186 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); | |
187 | addr += n; | |
188 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) | |
189 | return *addr; | |
190 | else | |
191 | return 0; | |
192 | } | |
193 | ||
a0987224 AB |
194 | #endif /* __ASSEMBLY__ */ |
195 | ||
da80d460 | 196 | #ifndef __powerpc64__ |
da80d460 | 197 | #else /* __powerpc64__ */ |
a0987224 | 198 | #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */ |
1da177e4 LT |
199 | #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */ |
200 | #define PT_VSCR_32 (PT_VR0 + 32*4 + 3) | |
201 | #define PT_VRSAVE_32 (PT_VR0 + 33*4) | |
ce48b210 | 202 | #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */ |
da80d460 | 203 | #endif /* __powerpc64__ */ |
da80d460 | 204 | #endif /* _ASM_POWERPC_PTRACE_H */ |