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 */
73 #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
74 struct { /* Must be a multiple of 16 bytes */
93 #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
98 * Size of redzone that userspace is allowed to use below the stack
99 * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
100 * the new ELFv2 little-endian ABI, so we allow the larger amount.
102 * For kernel code we allow a 288-byte redzone, in order to conserve
103 * kernel stack space; gcc currently only uses 288 bytes, and will
104 * hopefully allow explicit control of the redzone size in future.
106 #define USER_REDZONE_SIZE 512
107 #define KERNEL_REDZONE_SIZE 288
109 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
110 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
111 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
112 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
113 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
114 #define STACK_FRAME_MARKER 12
116 #ifdef PPC64_ELF_ABI_v2
117 #define STACK_FRAME_MIN_SIZE 32
119 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
122 /* Size of dummy stack frame allocated when calling signal handler. */
123 #define __SIGNAL_FRAMESIZE 128
124 #define __SIGNAL_FRAMESIZE32 64
126 #else /* __powerpc64__ */
128 #define USER_REDZONE_SIZE 0
129 #define KERNEL_REDZONE_SIZE 0
130 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
131 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
132 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
133 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
134 #define STACK_FRAME_MARKER 2
135 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
137 /* Size of stack frame allocated when calling signal handler. */
138 #define __SIGNAL_FRAMESIZE 64
140 #endif /* __powerpc64__ */
143 #include <asm/paca.h>
146 extern unsigned long profile_pc(struct pt_regs *regs);
148 #define profile_pc(regs) instruction_pointer(regs)
151 long do_syscall_trace_enter(struct pt_regs *regs);
152 void do_syscall_trace_leave(struct pt_regs *regs);
154 static inline void set_return_regs_changed(void)
156 #ifdef CONFIG_PPC_BOOK3S_64
157 local_paca->hsrr_valid = 0;
158 local_paca->srr_valid = 0;
162 static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
165 set_return_regs_changed();
168 static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
171 set_return_regs_changed();
174 static inline void regs_add_return_ip(struct pt_regs *regs, long offset)
176 regs_set_return_ip(regs, regs->nip + offset);
179 static inline unsigned long instruction_pointer(struct pt_regs *regs)
184 static inline void instruction_pointer_set(struct pt_regs *regs,
187 regs_set_return_ip(regs, val);
190 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
195 static inline unsigned long frame_pointer(struct pt_regs *regs)
201 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
203 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
206 #define force_successful_syscall_return() \
208 set_thread_flag(TIF_NOERROR); \
211 #define current_pt_regs() \
212 ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
215 * The 4 low bits (0xf) are available as flags to overload the trap word,
216 * because interrupt vectors have minimum alignment of 0x10. TRAP_FLAGS_MASK
217 * must cover the bits used as flags, including bit 0 which is used as the
221 #define TRAP_FLAGS_MASK 0x1
224 * On 4xx we use bit 1 in the trap word to indicate whether the exception
225 * is a critical exception (1 means it is).
227 #define TRAP_FLAGS_MASK 0xf
228 #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
229 #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
230 #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
231 #endif /* __powerpc64__ */
232 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
234 static __always_inline void set_trap(struct pt_regs *regs, unsigned long val)
236 regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
239 static inline bool trap_is_scv(struct pt_regs *regs)
241 return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
244 static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
246 return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
249 static inline bool trap_is_syscall(struct pt_regs *regs)
251 return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
254 static inline bool trap_norestart(struct pt_regs *regs)
256 return regs->trap & 0x1;
259 static __always_inline void set_trap_norestart(struct pt_regs *regs)
264 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
265 static inline int is_syscall_success(struct pt_regs *regs)
267 if (trap_is_scv(regs))
268 return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
270 return !(regs->ccr & 0x10000000);
273 static inline long regs_return_value(struct pt_regs *regs)
275 if (trap_is_scv(regs))
278 if (is_syscall_success(regs))
281 return -regs->gpr[3];
284 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
289 #define arch_has_single_step() (1)
290 #define arch_has_block_step() (true)
291 #define ARCH_HAS_USER_SINGLE_STEP_REPORT
294 * kprobe-based event tracer support
297 #include <linux/stddef.h>
298 #include <linux/thread_info.h>
299 extern int regs_query_register_offset(const char *name);
300 extern const char *regs_query_register_name(unsigned int offset);
301 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
304 * regs_get_register() - get register value from its offset
305 * @regs: pt_regs from which register value is gotten
306 * @offset: offset number of the register.
308 * regs_get_register returns the value of a register whose offset from @regs.
309 * The @offset is the offset of the register in struct pt_regs.
310 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
312 static inline unsigned long regs_get_register(struct pt_regs *regs,
315 if (unlikely(offset > MAX_REG_OFFSET))
317 return *(unsigned long *)((unsigned long)regs + offset);
321 * regs_within_kernel_stack() - check the address in the stack
322 * @regs: pt_regs which contains kernel stack pointer.
323 * @addr: address which is checked.
325 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
326 * If @addr is within the kernel stack, it returns true. If not, returns false.
329 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
332 return ((addr & ~(THREAD_SIZE - 1)) ==
333 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
337 * regs_get_kernel_stack_nth() - get Nth entry of the stack
338 * @regs: pt_regs which contains kernel stack pointer.
339 * @n: stack entry number.
341 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
342 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
345 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
348 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
350 if (regs_within_kernel_stack(regs, (unsigned long)addr))
356 #endif /* __ASSEMBLY__ */
358 #ifndef __powerpc64__
359 /* We need PT_SOFTE defined at all time to avoid #ifdefs */
360 #define PT_SOFTE PT_MQ
361 #else /* __powerpc64__ */
362 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
363 #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
364 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
365 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
366 #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
367 #endif /* __powerpc64__ */
368 #endif /* _ASM_POWERPC_PTRACE_H */