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;
57 #ifdef CONFIG_PPC_KUAP
60 #ifdef CONFIG_PPC_PKEY
64 #ifdef CONFIG_PPC_PKEY
68 unsigned long __pad[4]; /* Maintain 16 byte interrupt stack alignment */
74 #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
79 * Size of redzone that userspace is allowed to use below the stack
80 * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in
81 * the new ELFv2 little-endian ABI, so we allow the larger amount.
83 * For kernel code we allow a 288-byte redzone, in order to conserve
84 * kernel stack space; gcc currently only uses 288 bytes, and will
85 * hopefully allow explicit control of the redzone size in future.
87 #define USER_REDZONE_SIZE 512
88 #define KERNEL_REDZONE_SIZE 288
90 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
91 #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
92 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
93 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + \
94 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
95 #define STACK_FRAME_MARKER 12
97 #ifdef PPC64_ELF_ABI_v2
98 #define STACK_FRAME_MIN_SIZE 32
100 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
103 /* Size of dummy stack frame allocated when calling signal handler. */
104 #define __SIGNAL_FRAMESIZE 128
105 #define __SIGNAL_FRAMESIZE32 64
107 #else /* __powerpc64__ */
109 #define USER_REDZONE_SIZE 0
110 #define KERNEL_REDZONE_SIZE 0
111 #define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
112 #define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
113 #define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
114 #define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
115 #define STACK_FRAME_MARKER 2
116 #define STACK_FRAME_MIN_SIZE STACK_FRAME_OVERHEAD
118 /* Size of stack frame allocated when calling signal handler. */
119 #define __SIGNAL_FRAMESIZE 64
121 #endif /* __powerpc64__ */
125 static inline unsigned long instruction_pointer(struct pt_regs *regs)
130 static inline void instruction_pointer_set(struct pt_regs *regs,
136 static inline unsigned long user_stack_pointer(struct pt_regs *regs)
141 static inline unsigned long frame_pointer(struct pt_regs *regs)
147 extern unsigned long profile_pc(struct pt_regs *regs);
149 #define profile_pc(regs) instruction_pointer(regs)
152 long do_syscall_trace_enter(struct pt_regs *regs);
153 void do_syscall_trace_leave(struct pt_regs *regs);
155 #define kernel_stack_pointer(regs) ((regs)->gpr[1])
156 static inline int is_syscall_success(struct pt_regs *regs)
158 return !(regs->ccr & 0x10000000);
161 static inline long regs_return_value(struct pt_regs *regs)
163 if (is_syscall_success(regs))
166 return -regs->gpr[3];
169 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
175 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
177 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
180 #define force_successful_syscall_return() \
182 set_thread_flag(TIF_NOERROR); \
185 #define current_pt_regs() \
186 ((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
189 #ifdef CONFIG_PPC_BOOK3S
190 #define TRAP_FLAGS_MASK 0x10
191 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
192 #define FULL_REGS(regs) true
193 #define SET_FULL_REGS(regs) do { } while (0)
195 #define TRAP_FLAGS_MASK 0x11
196 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
197 #define FULL_REGS(regs) (((regs)->trap & 1) == 0)
198 #define SET_FULL_REGS(regs) ((regs)->trap |= 1)
200 #define CHECK_FULL_REGS(regs) BUG_ON(!FULL_REGS(regs))
201 #define NV_REG_POISON 0xdeadbeefdeadbeefUL
204 * We use the least-significant bit of the trap field to indicate
205 * whether we have saved the full set of registers, or only a
206 * partial set. A 1 there means the partial set.
207 * On 4xx we use the next bit to indicate whether the exception
208 * is a critical exception (1 means it is).
210 #define TRAP_FLAGS_MASK 0x1F
211 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
212 #define FULL_REGS(regs) (((regs)->trap & 1) == 0)
213 #define SET_FULL_REGS(regs) ((regs)->trap |= 1)
214 #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
215 #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
216 #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
217 #define NV_REG_POISON 0xdeadbeef
218 #define CHECK_FULL_REGS(regs) \
220 if ((regs)->trap & 1) \
221 printk(KERN_CRIT "%s: partial register set\n", __func__); \
223 #endif /* __powerpc64__ */
225 static inline void set_trap(struct pt_regs *regs, unsigned long val)
227 regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
230 static inline bool trap_is_scv(struct pt_regs *regs)
232 return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
235 static inline bool trap_is_unsupported_scv(struct pt_regs *regs)
237 return IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x7ff0;
240 static inline bool trap_is_syscall(struct pt_regs *regs)
242 return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
245 static inline bool trap_norestart(struct pt_regs *regs)
247 return regs->trap & 0x10;
250 static inline void set_trap_norestart(struct pt_regs *regs)
255 #define arch_has_single_step() (1)
256 #define arch_has_block_step() (true)
257 #define ARCH_HAS_USER_SINGLE_STEP_REPORT
260 * kprobe-based event tracer support
263 #include <linux/stddef.h>
264 #include <linux/thread_info.h>
265 extern int regs_query_register_offset(const char *name);
266 extern const char *regs_query_register_name(unsigned int offset);
267 #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
270 * regs_get_register() - get register value from its offset
271 * @regs: pt_regs from which register value is gotten
272 * @offset: offset number of the register.
274 * regs_get_register returns the value of a register whose offset from @regs.
275 * The @offset is the offset of the register in struct pt_regs.
276 * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
278 static inline unsigned long regs_get_register(struct pt_regs *regs,
281 if (unlikely(offset > MAX_REG_OFFSET))
283 return *(unsigned long *)((unsigned long)regs + offset);
287 * regs_within_kernel_stack() - check the address in the stack
288 * @regs: pt_regs which contains kernel stack pointer.
289 * @addr: address which is checked.
291 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
292 * If @addr is within the kernel stack, it returns true. If not, returns false.
295 static inline bool regs_within_kernel_stack(struct pt_regs *regs,
298 return ((addr & ~(THREAD_SIZE - 1)) ==
299 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
303 * regs_get_kernel_stack_nth() - get Nth entry of the stack
304 * @regs: pt_regs which contains kernel stack pointer.
305 * @n: stack entry number.
307 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
308 * is specified by @regs. If the @n th entry is NOT in the kernel stack,
311 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
314 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
316 if (regs_within_kernel_stack(regs, (unsigned long)addr))
322 #endif /* __ASSEMBLY__ */
324 #ifndef __powerpc64__
325 /* We need PT_SOFTE defined at all time to avoid #ifdefs */
326 #define PT_SOFTE PT_MQ
327 #else /* __powerpc64__ */
328 #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1) /* each FP reg occupies 2 32-bit userspace slots */
329 #define PT_VR0_32 164 /* each Vector reg occupies 4 slots in 32-bit */
330 #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
331 #define PT_VRSAVE_32 (PT_VR0 + 33*4)
332 #define PT_VSR0_32 300 /* each VSR reg occupies 4 slots in 32-bit */
333 #endif /* __powerpc64__ */
334 #endif /* _ASM_POWERPC_PTRACE_H */