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;
51 #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP)
56 unsigned long exit_result;
59 #ifdef CONFIG_PPC_KUAP
62 #ifdef CONFIG_PPC_PKEY
66 #ifdef CONFIG_PPC_PKEY
70 unsigned long __pad[4]; /* Maintain 16 byte interrupt stack alignment */
77 #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
82 * Size of redzone that userspace is allowed to use below the stack
83 * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
84 * the new ELFv2 little-endian ABI, so we allow the larger amount.
86 * For kernel code we allow a 288-byte redzone, in order to conserve
87 * kernel stack space; gcc currently only uses 288 bytes, and will
88 * hopefully allow explicit control of the redzone size in future.
90 #define USER_REDZONE_SIZE 512
91 #define KERNEL_REDZONE_SIZE 288
93 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
94 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
95 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
96 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
97 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
98 #define STACK_FRAME_MARKER 12
100 #ifdef PPC64_ELF_ABI_v2
101 #define STACK_FRAME_MIN_SIZE 32
103 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
106 /* Size of dummy stack frame allocated when calling signal handler. */
107 #define __SIGNAL_FRAMESIZE 128
108 #define __SIGNAL_FRAMESIZE32 64
110 #else /* __powerpc64__ */
112 #define USER_REDZONE_SIZE 0
113 #define KERNEL_REDZONE_SIZE 0
114 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
115 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
116 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
117 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
118 #define STACK_FRAME_MARKER 2
119 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
121 /* Size of stack frame allocated when calling signal handler. */
122 #define __SIGNAL_FRAMESIZE 64
124 #endif /* __powerpc64__ */
127 #include <asm/paca.h>
130 extern unsigned long profile_pc(struct pt_regs *regs);
132 #define profile_pc(regs) instruction_pointer(regs)
135 long do_syscall_trace_enter(struct pt_regs *regs);
136 void do_syscall_trace_leave(struct pt_regs *regs);
138 static inline void set_return_regs_changed(void)
140 #ifdef CONFIG_PPC_BOOK3S_64
141 local_paca->hsrr_valid = 0;
142 local_paca->srr_valid = 0;
146 static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
149 set_return_regs_changed();
152 static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
155 set_return_regs_changed();
158 static inline void regs_add_return_ip(struct pt_regs *regs, long offset)
160 regs_set_return_ip(regs, regs->nip + offset);
163 static inline unsigned long instruction_pointer(struct pt_regs *regs)
168 static inline void instruction_pointer_set(struct pt_regs *regs,
171 regs_set_return_ip(regs, val);
174 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
179 static inline unsigned long frame_pointer(struct pt_regs *regs)
185 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
187 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
190 #define force_successful_syscall_return() \
192 set_thread_flag(TIF_NOERROR); \
195 #define current_pt_regs() \
196 ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
199 * The 4 low bits (0xf) are available as flags to overload the trap word,
200 * because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK
201 * must cover the bits used as flags, including bit 0 which is used as the
205 #define TRAP_FLAGS_MASK 0x1
208 * On 4xx we use bit 1 in the trap word to indicate whether the exception
209 * is a critical exception (1 means it is).
211 #define TRAP_FLAGS_MASK 0xf
212 #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
213 #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
214 #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
215 #endif /* __powerpc64__ */
216 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
218 static __always_inline void set_trap(struct pt_regs *regs, unsigned long val)
220 regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
223 static inline bool trap_is_scv(struct pt_regs *regs)
225 return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
228 static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
230 return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
233 static inline bool trap_is_syscall(struct pt_regs *regs)
235 return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
238 static inline bool trap_norestart(struct pt_regs *regs)
240 return regs->trap & 0x1;
243 static __always_inline void set_trap_norestart(struct pt_regs *regs)
248 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
249 static inline int is_syscall_success(struct pt_regs *regs)
251 if (trap_is_scv(regs))
252 return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
254 return !(regs->ccr & 0x10000000);
257 static inline long regs_return_value(struct pt_regs *regs)
259 if (trap_is_scv(regs))
262 if (is_syscall_success(regs))
265 return -regs->gpr[3];
268 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
273 #define arch_has_single_step() (1)
274 #define arch_has_block_step() (true)
275 #define ARCH_HAS_USER_SINGLE_STEP_REPORT
278 * kprobe-based event tracer support
281 #include <linux/stddef.h>
282 #include <linux/thread_info.h>
283 extern int regs_query_register_offset(const char *name);
284 extern const char *regs_query_register_name(unsigned int offset);
285 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
288 * regs_get_register() - get register value from its offset
289 * @regs: pt_regs from which register value is gotten
290 * @offset: offset number of the register.
292 * regs_get_register returns the value of a register whose offset from @regs.
293 * The @offset is the offset of the register in struct pt_regs.
294 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
296 static inline unsigned long regs_get_register(struct pt_regs *regs,
299 if (unlikely(offset > MAX_REG_OFFSET))
301 return *(unsigned long *)((unsigned long)regs + offset);
305 * regs_within_kernel_stack() - check the address in the stack
306 * @regs: pt_regs which contains kernel stack pointer.
307 * @addr: address which is checked.
309 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
310 * If @addr is within the kernel stack, it returns true. If not, returns false.
313 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
316 return ((addr & ~(THREAD_SIZE - 1)) ==
317 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
321 * regs_get_kernel_stack_nth() - get Nth entry of the stack
322 * @regs: pt_regs which contains kernel stack pointer.
323 * @n: stack entry number.
325 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
326 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
329 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
332 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
334 if (regs_within_kernel_stack(regs, (unsigned long)addr))
340 #endif /* __ASSEMBLY__ */
342 #ifndef __powerpc64__
343 /* We need PT_SOFTE defined at all time to avoid #ifdefs */
344 #define PT_SOFTE PT_MQ
345 #else /* __powerpc64__ */
346 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
347 #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
348 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
349 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
350 #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
351 #endif /* __powerpc64__ */
352 #endif /* _ASM_POWERPC_PTRACE_H */