1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000 by Ralf Baechle 4 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 5 */ 6 #ifndef _ASM_PTRACE_H 7 #define _ASM_PTRACE_H 8 9 #include <linux/compiler.h> 10 #include <linux/types.h> 11 #include <asm/isadep.h> 12 13 /* 14 * This struct defines the way the registers are stored on the stack during a 15 * system call/exception. As usual the registers k0/k1 aren't being saved. 16 * 17 * If you add a register here, also add it to regoffset_table[] in 18 * arch/mips/kernel/ptrace.c. 19 */ 20 struct pt_regs { 21 #ifdef CONFIG_32BIT 22 /* Pad bytes for argument save space on the stack. */ 23 unsigned long pad0[8]; 24 #endif 25 26 /* Saved main processor registers. */ 27 unsigned long regs[32]; 28 29 /* Saved special registers. */ 30 unsigned long cp0_status; 31 unsigned long hi; 32 unsigned long lo; 33 #ifdef CONFIG_CPU_HAS_SMARTMIPS 34 unsigned long acx; 35 #endif 36 unsigned long cp0_badvaddr; 37 unsigned long cp0_cause; 38 unsigned long cp0_epc; 39 #ifdef CONFIG_CPU_CAVIUM_OCTEON 40 unsigned long long mpl[6]; /* MTM{0-5} */ 41 unsigned long long mtp[6]; /* MTP{0-5} */ 42 #endif 43 unsigned long __last[0]; 44 } __aligned(8); 45 46 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 47 { 48 return regs->regs[31]; 49 } 50 51 /* 52 * Don't use asm-generic/ptrace.h it defines FP accessors that don't make 53 * sense on MIPS. We rather want an error if they get invoked. 54 */ 55 56 static inline void instruction_pointer_set(struct pt_regs *regs, 57 unsigned long val) 58 { 59 regs->cp0_epc = val; 60 } 61 62 /* Query offset/name of register from its name/offset */ 63 extern int regs_query_register_offset(const char *name); 64 #define MAX_REG_OFFSET (offsetof(struct pt_regs, __last)) 65 66 /** 67 * regs_get_register() - get register value from its offset 68 * @regs: pt_regs from which register value is gotten. 69 * @offset: offset number of the register. 70 * 71 * regs_get_register returns the value of a register. The @offset is the 72 * offset of the register in struct pt_regs address which specified by @regs. 73 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 74 */ 75 static inline unsigned long regs_get_register(struct pt_regs *regs, 76 unsigned int offset) 77 { 78 if (unlikely(offset > MAX_REG_OFFSET)) 79 return 0; 80 81 return *(unsigned long *)((unsigned long)regs + offset); 82 } 83 84 /* 85 * Does the process account for user or for system time? 86 */ 87 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER) 88 89 #define instruction_pointer(regs) ((regs)->cp0_epc) 90 #define profile_pc(regs) instruction_pointer(regs) 91 92 /* Helpers for working with the user stack pointer */ 93 94 static inline unsigned long user_stack_pointer(struct pt_regs *regs) 95 { 96 return regs->regs[29]; 97 } 98 99 static inline void user_stack_pointer_set(struct pt_regs *regs, 100 unsigned long val) 101 { 102 regs->regs[29] = val; 103 } 104 105 #endif /* _ASM_PTRACE_H */ 106