1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2001 PPC64 Team, IBM Corp
5 * This struct defines the way the registers are stored on the
6 * kernel stack during a system call or other kernel entry.
8 * this should only contain volatile regs
9 * since we can keep non-volatile in the thread_struct
10 * should set this up when only volatiles are saved
13 * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
14 * that the overall structure is a multiple of 16 bytes in length.
16 * Note that the offsets of the fields in this struct correspond with
17 * the PT_* values below. This simplifies arch/powerpc/kernel/ptrace.c.
19 #ifndef _ASM_POWERPC_PTRACE_H
20 #define _ASM_POWERPC_PTRACE_H
22 #include <uapi/asm/ptrace.h>
23 #include <asm/asm-const.h>
29 struct user_pt_regs user_regs;
31 unsigned long gpr[32];
34 unsigned long orig_gpr3;
56 #ifdef CONFIG_PPC_KUAP
60 unsigned long __pad[2]; /* Maintain 16 byte interrupt stack alignment */
66 #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
71 * Size of redzone that userspace is allowed to use below the stack
72 * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
73 * the new ELFv2 little-endian ABI, so we allow the larger amount.
75 * For kernel code we allow a 288-byte redzone, in order to conserve
76 * kernel stack space; gcc currently only uses 288 bytes, and will
77 * hopefully allow explicit control of the redzone size in future.
79 #define USER_REDZONE_SIZE 512
80 #define KERNEL_REDZONE_SIZE 288
82 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
83 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
84 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
85 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
86 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
87 #define STACK_FRAME_MARKER 12
89 #ifdef PPC64_ELF_ABI_v2
90 #define STACK_FRAME_MIN_SIZE 32
92 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
95 /* Size of dummy stack frame allocated when calling signal handler. */
96 #define __SIGNAL_FRAMESIZE 128
97 #define __SIGNAL_FRAMESIZE32 64
99 #else /* __powerpc64__ */
101 #define USER_REDZONE_SIZE 0
102 #define KERNEL_REDZONE_SIZE 0
103 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
104 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
105 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
106 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
107 #define STACK_FRAME_MARKER 2
108 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
110 /* Size of stack frame allocated when calling signal handler. */
111 #define __SIGNAL_FRAMESIZE 64
113 #endif /* __powerpc64__ */
117 static inline unsigned long instruction_pointer(struct pt_regs *regs)
122 static inline void instruction_pointer_set(struct pt_regs *regs,
128 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
133 static inline unsigned long frame_pointer(struct pt_regs *regs)
139 extern unsigned long profile_pc(struct pt_regs *regs);
141 #define profile_pc(regs) instruction_pointer(regs)
144 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
145 static inline int is_syscall_success(struct pt_regs *regs)
147 return !(regs->ccr & 0x10000000);
150 static inline long regs_return_value(struct pt_regs *regs)
152 if (is_syscall_success(regs))
155 return -regs->gpr[3];
158 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
164 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
166 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
169 #define force_successful_syscall_return() \
171 set_thread_flag(TIF_NOERROR); \
175 extern int ptrace_get_reg(struct task_struct *task, int regno,
176 unsigned long *data);
177 extern int ptrace_put_reg(struct task_struct *task, int regno,
180 #define current_pt_regs() \
181 ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
183 * We use the least-significant bit of the trap field to indicate
184 * whether we have saved the full set of registers, or only a
185 * partial set. A 1 there means the partial set.
186 * On 4xx we use the next bit to indicate whether the exception
187 * is a critical exception (1 means it is).
189 #define FULL_REGS(regs) (((regs)->trap & 1) == 0)
190 #ifndef __powerpc64__
191 #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
192 #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
193 #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
194 #endif /* ! __powerpc64__ */
195 #define TRAP(regs) ((regs)->trap & ~0xF)
197 #define NV_REG_POISON 0xdeadbeefdeadbeefUL
198 #define CHECK_FULL_REGS(regs) BUG_ON(regs->trap & 1)
200 #define NV_REG_POISON 0xdeadbeef
201 #define CHECK_FULL_REGS(regs) \
203 if ((regs)->trap & 1) \
204 printk(KERN_CRIT "%s: partial register set\n", __func__); \
206 #endif /* __powerpc64__ */
208 #define arch_has_single_step() (1)
209 #ifndef CONFIG_PPC_BOOK3S_601
210 #define arch_has_block_step() (true)
212 #define arch_has_block_step() (false)
214 #define ARCH_HAS_USER_SINGLE_STEP_REPORT
217 * kprobe-based event tracer support
220 #include <linux/stddef.h>
221 #include <linux/thread_info.h>
222 extern int regs_query_register_offset(const char *name);
223 extern const char *regs_query_register_name(unsigned int offset);
224 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
227 * regs_get_register() - get register value from its offset
228 * @regs: pt_regs from which register value is gotten
229 * @offset: offset number of the register.
231 * regs_get_register returns the value of a register whose offset from @regs.
232 * The @offset is the offset of the register in struct pt_regs.
233 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
235 static inline unsigned long regs_get_register(struct pt_regs *regs,
238 if (unlikely(offset > MAX_REG_OFFSET))
240 return *(unsigned long *)((unsigned long)regs + offset);
244 * regs_within_kernel_stack() - check the address in the stack
245 * @regs: pt_regs which contains kernel stack pointer.
246 * @addr: address which is checked.
248 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
249 * If @addr is within the kernel stack, it returns true. If not, returns false.
252 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
255 return ((addr & ~(THREAD_SIZE - 1)) ==
256 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
260 * regs_get_kernel_stack_nth() - get Nth entry of the stack
261 * @regs: pt_regs which contains kernel stack pointer.
262 * @n: stack entry number.
264 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
265 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
268 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
271 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
273 if (regs_within_kernel_stack(regs, (unsigned long)addr))
279 #endif /* __ASSEMBLY__ */
281 #ifndef __powerpc64__
282 #else /* __powerpc64__ */
283 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
284 #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
285 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
286 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
287 #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
288 #endif /* __powerpc64__ */
289 #endif /* _ASM_POWERPC_PTRACE_H */