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 <linux/err.h>
23 #include <uapi/asm/ptrace.h>
24 #include <asm/asm-const.h>
30 struct user_pt_regs user_regs;
32 unsigned long gpr[32];
35 unsigned long orig_gpr3;
58 #ifdef CONFIG_PPC_KUAP
61 #ifdef CONFIG_PPC_PKEY
65 #ifdef CONFIG_PPC_PKEY
69 unsigned long __pad[4]; /* Maintain 16 byte interrupt stack alignment */
75 #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
80 * Size of redzone that userspace is allowed to use below the stack
81 * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
82 * the new ELFv2 little-endian ABI, so we allow the larger amount.
84 * For kernel code we allow a 288-byte redzone, in order to conserve
85 * kernel stack space; gcc currently only uses 288 bytes, and will
86 * hopefully allow explicit control of the redzone size in future.
88 #define USER_REDZONE_SIZE 512
89 #define KERNEL_REDZONE_SIZE 288
91 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
92 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
93 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
94 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
95 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
96 #define STACK_FRAME_MARKER 12
98 #ifdef PPC64_ELF_ABI_v2
99 #define STACK_FRAME_MIN_SIZE 32
101 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
104 /* Size of dummy stack frame allocated when calling signal handler. */
105 #define __SIGNAL_FRAMESIZE 128
106 #define __SIGNAL_FRAMESIZE32 64
108 #else /* __powerpc64__ */
110 #define USER_REDZONE_SIZE 0
111 #define KERNEL_REDZONE_SIZE 0
112 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
113 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
114 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
115 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
116 #define STACK_FRAME_MARKER 2
117 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
119 /* Size of stack frame allocated when calling signal handler. */
120 #define __SIGNAL_FRAMESIZE 64
122 #endif /* __powerpc64__ */
126 static inline unsigned long instruction_pointer(struct pt_regs *regs)
131 static inline void instruction_pointer_set(struct pt_regs *regs,
137 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
142 static inline unsigned long frame_pointer(struct pt_regs *regs)
148 extern unsigned long profile_pc(struct pt_regs *regs);
150 #define profile_pc(regs) instruction_pointer(regs)
153 long do_syscall_trace_enter(struct pt_regs *regs);
154 void do_syscall_trace_leave(struct pt_regs *regs);
157 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
159 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
162 #define force_successful_syscall_return() \
164 set_thread_flag(TIF_NOERROR); \
167 #define current_pt_regs() \
168 ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
171 * The 4 low bits (0xf) are available as flags to overload the trap word,
172 * because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK
173 * must cover the bits used as flags, including bit 0 which is used as the
177 #define TRAP_FLAGS_MASK 0x1
180 * On 4xx we use bit 1 in the trap word to indicate whether the exception
181 * is a critical exception (1 means it is).
183 #define TRAP_FLAGS_MASK 0xf
184 #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
185 #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
186 #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
187 #endif /* __powerpc64__ */
188 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
190 static __always_inline void set_trap(struct pt_regs *regs, unsigned long val)
192 regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
195 static inline bool trap_is_scv(struct pt_regs *regs)
197 return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
200 static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
202 return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
205 static inline bool trap_is_syscall(struct pt_regs *regs)
207 return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
210 static inline bool trap_norestart(struct pt_regs *regs)
212 return regs->trap & 0x1;
215 static __always_inline void set_trap_norestart(struct pt_regs *regs)
220 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
221 static inline int is_syscall_success(struct pt_regs *regs)
223 if (trap_is_scv(regs))
224 return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
226 return !(regs->ccr & 0x10000000);
229 static inline long regs_return_value(struct pt_regs *regs)
231 if (trap_is_scv(regs))
234 if (is_syscall_success(regs))
237 return -regs->gpr[3];
240 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
245 #define arch_has_single_step() (1)
246 #define arch_has_block_step() (true)
247 #define ARCH_HAS_USER_SINGLE_STEP_REPORT
250 * kprobe-based event tracer support
253 #include <linux/stddef.h>
254 #include <linux/thread_info.h>
255 extern int regs_query_register_offset(const char *name);
256 extern const char *regs_query_register_name(unsigned int offset);
257 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
260 * regs_get_register() - get register value from its offset
261 * @regs: pt_regs from which register value is gotten
262 * @offset: offset number of the register.
264 * regs_get_register returns the value of a register whose offset from @regs.
265 * The @offset is the offset of the register in struct pt_regs.
266 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
268 static inline unsigned long regs_get_register(struct pt_regs *regs,
271 if (unlikely(offset > MAX_REG_OFFSET))
273 return *(unsigned long *)((unsigned long)regs + offset);
277 * regs_within_kernel_stack() - check the address in the stack
278 * @regs: pt_regs which contains kernel stack pointer.
279 * @addr: address which is checked.
281 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
282 * If @addr is within the kernel stack, it returns true. If not, returns false.
285 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
288 return ((addr & ~(THREAD_SIZE - 1)) ==
289 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
293 * regs_get_kernel_stack_nth() - get Nth entry of the stack
294 * @regs: pt_regs which contains kernel stack pointer.
295 * @n: stack entry number.
297 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
298 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
301 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
304 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
306 if (regs_within_kernel_stack(regs, (unsigned long)addr))
312 #endif /* __ASSEMBLY__ */
314 #ifndef __powerpc64__
315 /* We need PT_SOFTE defined at all time to avoid #ifdefs */
316 #define PT_SOFTE PT_MQ
317 #else /* __powerpc64__ */
318 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
319 #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
320 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
321 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
322 #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
323 #endif /* __powerpc64__ */
324 #endif /* _ASM_POWERPC_PTRACE_H */