1 /* SPDX-License-Identifier: GPL-2.0-or-later */
8  * this should only contain volatile regs
9  * since we can keep non-volatile in the thread_struct
23 #include <asm/asm-const.h>
69  * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
70  * the new ELFv2 little-endian ABI, so we allow the larger amount.
72  * For kernel code we allow a 288-byte redzone, in order to conserve
114 static inline unsigned long instruction_pointer(struct pt_regs *regs)  in instruction_pointer()  argument
116 	return regs->nip;  in instruction_pointer()
119 static inline void instruction_pointer_set(struct pt_regs *regs,  in instruction_pointer_set()  argument
122 	regs->nip = val;  in instruction_pointer_set()
125 static inline unsigned long user_stack_pointer(struct pt_regs *regs)  in user_stack_pointer()  argument
127 	return regs->gpr[1];  in user_stack_pointer()
130 static inline unsigned long frame_pointer(struct pt_regs *regs)  in frame_pointer()  argument
136 extern unsigned long profile_pc(struct pt_regs *regs);
138 #define profile_pc(regs) instruction_pointer(regs)  argument
141 long do_syscall_trace_enter(struct pt_regs *regs);
142 void do_syscall_trace_leave(struct pt_regs *regs);
144 #define kernel_stack_pointer(regs) ((regs)->gpr[1])  argument
145 static inline int is_syscall_success(struct pt_regs *regs)  in is_syscall_success()  argument
147 	return !(regs->ccr & 0x10000000);  in is_syscall_success()
150 static inline long regs_return_value(struct pt_regs *regs)  in regs_return_value()  argument
152 	if (is_syscall_success(regs))  in regs_return_value()
153 		return regs->gpr[3];  in regs_return_value()
155 		return -regs->gpr[3];  in regs_return_value()
158 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)  in regs_set_return_value()  argument
160 	regs->gpr[3] = rc;  in regs_set_return_value()
164 #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)  argument
166 #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)  argument
181 	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
186 #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)  argument
187 #define FULL_REGS(regs)		true  argument
188 #define SET_FULL_REGS(regs)	do { } while (0)  argument
191 #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)  argument
192 #define FULL_REGS(regs)		(((regs)->trap & 1) == 0)  argument
193 #define SET_FULL_REGS(regs)	((regs)->trap |= 1)  argument
195 #define CHECK_FULL_REGS(regs)	BUG_ON(!FULL_REGS(regs))  argument
199  * We use the least-significant bit of the trap field to indicate
206 #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)  argument
207 #define FULL_REGS(regs)		(((regs)->trap & 1) == 0)  argument
208 #define SET_FULL_REGS(regs)	((regs)->trap |= 1)  argument
209 #define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)  argument
210 #define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)  argument
211 #define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)  argument
213 #define CHECK_FULL_REGS(regs)						      \  argument
215 	if ((regs)->trap & 1)						      \
220 static inline void set_trap(struct pt_regs *regs, unsigned long val)  in set_trap()  argument
222 	regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);  in set_trap()
225 static inline bool trap_is_scv(struct pt_regs *regs)  in trap_is_scv()  argument
227 	return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);  in trap_is_scv()
230 static inline bool trap_is_syscall(struct pt_regs *regs)  in trap_is_syscall()  argument
232 	return (trap_is_scv(regs) || TRAP(regs) == 0xc00);  in trap_is_syscall()
235 static inline bool trap_norestart(struct pt_regs *regs)  in trap_norestart()  argument
237 	return regs->trap & 0x10;  in trap_norestart()
240 static inline void set_trap_norestart(struct pt_regs *regs)  in set_trap_norestart()  argument
242 	regs->trap |= 0x10;  in set_trap_norestart()
250  * kprobe-based event tracer support
260  * regs_get_register() - get register value from its offset
261  * @regs:	   pt_regs from which register value is gotten
264  * regs_get_register returns the value of a register whose offset from @regs.
268 static inline unsigned long regs_get_register(struct pt_regs *regs,  in regs_get_register()  argument
273 	return *(unsigned long *)((unsigned long)regs + offset);  in regs_get_register()
277  * regs_within_kernel_stack() - check the address in the stack
278  * @regs:      pt_regs which contains kernel stack pointer.
285 static inline bool regs_within_kernel_stack(struct pt_regs *regs,  in regs_within_kernel_stack()  argument
288 	return ((addr & ~(THREAD_SIZE - 1))  ==  in regs_within_kernel_stack()
289 		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));  in regs_within_kernel_stack()
293  * regs_get_kernel_stack_nth() - get Nth entry of the stack
294  * @regs:	pt_regs which contains kernel stack pointer.
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,  in regs_get_kernel_stack_nth()  argument
304 	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);  in regs_get_kernel_stack_nth()
306 	if (regs_within_kernel_stack(regs, (unsigned long)addr))  in regs_get_kernel_stack_nth()
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 */
322 #define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */