Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2001 PPC64 Team, IBM Corp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * This struct defines the way the registers are stored on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * kernel stack during a system call or other kernel entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * this should only contain volatile regs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * since we can keep non-volatile in the thread_struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * should set this up when only volatiles are saved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * by intr code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * that the overall structure is a multiple of 16 bytes in length.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  * Note that the offsets of the fields in this struct correspond with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * the PT_* values below.  This simplifies arch/powerpc/kernel/ptrace.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #ifndef _ASM_POWERPC_PTRACE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define _ASM_POWERPC_PTRACE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <uapi/asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <asm/asm-const.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) struct pt_regs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		struct user_pt_regs user_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 			unsigned long gpr[32];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 			unsigned long nip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 			unsigned long msr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			unsigned long orig_gpr3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 			unsigned long ctr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 			unsigned long link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 			unsigned long xer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 			unsigned long ccr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			unsigned long softe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			unsigned long mq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			unsigned long trap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			unsigned long dar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			unsigned long dsisr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 			unsigned long result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) #ifdef CONFIG_PPC64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			unsigned long ppr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #ifdef CONFIG_PPC_KUAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 			unsigned long kuap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		unsigned long __pad[2];	/* Maintain 16 byte interrupt stack alignment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) #define STACK_FRAME_WITH_PT_REGS (STACK_FRAME_OVERHEAD + sizeof(struct pt_regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * Size of redzone that userspace is allowed to use below the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  * pointer.  This is 288 in the 64-bit big-endian ELF ABI, and 512 in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * the new ELFv2 little-endian ABI, so we allow the larger amount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * For kernel code we allow a 288-byte redzone, in order to conserve
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * kernel stack space; gcc currently only uses 288 bytes, and will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * hopefully allow explicit control of the redzone size in future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) #define USER_REDZONE_SIZE	512
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) #define KERNEL_REDZONE_SIZE	288
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) #define STACK_FRAME_OVERHEAD	112	/* size of minimum stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) #define STACK_FRAME_LR_SAVE	2	/* Location of LR in stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) #define STACK_FRAME_REGS_MARKER	ASM_CONST(0x7265677368657265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) #define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 				 STACK_FRAME_OVERHEAD + KERNEL_REDZONE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) #define STACK_FRAME_MARKER	12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) #ifdef PPC64_ELF_ABI_v2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) #define STACK_FRAME_MIN_SIZE	32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) #define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) /* Size of dummy stack frame allocated when calling signal handler. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) #define __SIGNAL_FRAMESIZE	128
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) #define __SIGNAL_FRAMESIZE32	64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #else /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define USER_REDZONE_SIZE	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) #define KERNEL_REDZONE_SIZE	0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) #define STACK_FRAME_OVERHEAD	16	/* size of minimum stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define STACK_FRAME_LR_SAVE	1	/* Location of LR in stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #define STACK_FRAME_REGS_MARKER	ASM_CONST(0x72656773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #define STACK_INT_FRAME_SIZE	(sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #define STACK_FRAME_MARKER	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #define STACK_FRAME_MIN_SIZE	STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) /* Size of stack frame allocated when calling signal handler. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) #define __SIGNAL_FRAMESIZE	64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static inline unsigned long instruction_pointer(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return regs->nip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static inline void instruction_pointer_set(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	regs->nip = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static inline unsigned long user_stack_pointer(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	return regs->gpr[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static inline unsigned long frame_pointer(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #ifdef CONFIG_SMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) extern unsigned long profile_pc(struct pt_regs *regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #define profile_pc(regs) instruction_pointer(regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) long do_syscall_trace_enter(struct pt_regs *regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) void do_syscall_trace_leave(struct pt_regs *regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #define user_mode(regs) ((((regs)->msr) >> MSR_PR_LG) & 0x1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) #define user_mode(regs) (((regs)->msr & MSR_PR) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) #define force_successful_syscall_return()   \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		set_thread_flag(TIF_NOERROR); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	} while(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct task_struct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) extern int ptrace_get_reg(struct task_struct *task, int regno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			  unsigned long *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) extern int ptrace_put_reg(struct task_struct *task, int regno,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 			  unsigned long data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #define current_pt_regs() \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	((struct pt_regs *)((unsigned long)task_stack_page(current) + THREAD_SIZE) - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) #ifdef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) #ifdef CONFIG_PPC_BOOK3S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) #define TRAP_FLAGS_MASK		0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #define FULL_REGS(regs)		true
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #define SET_FULL_REGS(regs)	do { } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) #define TRAP_FLAGS_MASK		0x11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) #define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) #define SET_FULL_REGS(regs)	((regs)->trap &= ~1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) #define CHECK_FULL_REGS(regs)	BUG_ON(!FULL_REGS(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) #define NV_REG_POISON		0xdeadbeefdeadbeefUL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * We use the least-significant bit of the trap field to indicate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  * whether we have saved the full set of registers, or only a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * partial set.  A 1 there means the partial set.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * On 4xx we use the next bit to indicate whether the exception
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * is a critical exception (1 means it is).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) #define TRAP_FLAGS_MASK		0x1F
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #define TRAP(regs)		((regs)->trap & ~TRAP_FLAGS_MASK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #define FULL_REGS(regs)		(((regs)->trap & 1) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #define SET_FULL_REGS(regs)	((regs)->trap &= ~1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define IS_CRITICAL_EXC(regs)	(((regs)->trap & 2) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) #define IS_MCHECK_EXC(regs)	(((regs)->trap & 4) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) #define IS_DEBUG_EXC(regs)	(((regs)->trap & 8) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) #define NV_REG_POISON		0xdeadbeef
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #define CHECK_FULL_REGS(regs)						      \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) do {									      \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if ((regs)->trap & 1)						      \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		printk(KERN_CRIT "%s: partial register set\n", __func__); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) static inline void set_trap(struct pt_regs *regs, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	regs->trap = (regs->trap & TRAP_FLAGS_MASK) | (val & ~TRAP_FLAGS_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static inline bool trap_is_scv(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && TRAP(regs) == 0x3000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static inline bool trap_is_syscall(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return (trap_is_scv(regs) || TRAP(regs) == 0xc00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) static inline bool trap_norestart(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return regs->trap & 0x10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static inline void set_trap_norestart(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	regs->trap |= 0x10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) #define kernel_stack_pointer(regs) ((regs)->gpr[1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static inline int is_syscall_success(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (trap_is_scv(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return !IS_ERR_VALUE((unsigned long)regs->gpr[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		return !(regs->ccr & 0x10000000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static inline long regs_return_value(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (trap_is_scv(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		return regs->gpr[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (is_syscall_success(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		return regs->gpr[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return -regs->gpr[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	regs->gpr[3] = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) #define arch_has_single_step()	(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) #define arch_has_block_step()	(true)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) #define ARCH_HAS_USER_SINGLE_STEP_REPORT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)  * kprobe-based event tracer support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) #include <linux/thread_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) extern int regs_query_register_offset(const char *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) extern const char *regs_query_register_name(unsigned int offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) #define MAX_REG_OFFSET (offsetof(struct pt_regs, dsisr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)  * regs_get_register() - get register value from its offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * @regs:	   pt_regs from which register value is gotten
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * @offset:    offset number of the register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  * regs_get_register returns the value of a register whose offset from @regs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * The @offset is the offset of the register in struct pt_regs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * If @offset is bigger than MAX_REG_OFFSET, this returns 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static inline unsigned long regs_get_register(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 						unsigned int offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	if (unlikely(offset > MAX_REG_OFFSET))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	return *(unsigned long *)((unsigned long)regs + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  * regs_within_kernel_stack() - check the address in the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  * @regs:      pt_regs which contains kernel stack pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)  * @addr:      address which is checked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)  * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)  * If @addr is within the kernel stack, it returns true. If not, returns false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static inline bool regs_within_kernel_stack(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 						unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	return ((addr & ~(THREAD_SIZE - 1))  ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)  * regs_get_kernel_stack_nth() - get Nth entry of the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  * @regs:	pt_regs which contains kernel stack pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)  * @n:		stack entry number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)  * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)  * is specified by @regs. If the @n th entry is NOT in the kernel stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  * this returns 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 						      unsigned int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	addr += n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (regs_within_kernel_stack(regs, (unsigned long)addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		return *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) #endif /* __ASSEMBLY__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) #ifndef __powerpc64__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /* We need PT_SOFTE defined at all time to avoid #ifdefs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) #define PT_SOFTE PT_MQ
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) #else /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) #define PT_FPSCR32 (PT_FPR0 + 2*32 + 1)	/* each FP reg occupies 2 32-bit userspace slots */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) #define PT_VR0_32 164	/* each Vector reg occupies 4 slots in 32-bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) #define PT_VSCR_32 (PT_VR0 + 32*4 + 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) #define PT_VRSAVE_32 (PT_VR0 + 33*4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) #define PT_VSR0_32 300 	/* each VSR reg occupies 4 slots in 32-bit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) #endif /* __powerpc64__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) #endif /* _ASM_POWERPC_PTRACE_H */