1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1999, 2000 Niibe Yutaka 4 */ 5 #ifndef __ASM_SH_PTRACE_H 6 #define __ASM_SH_PTRACE_H 7 8 9 #include <linux/stringify.h> 10 #include <linux/stddef.h> 11 #include <linux/thread_info.h> 12 #include <asm/addrspace.h> 13 #include <asm/page.h> 14 #include <uapi/asm/ptrace.h> 15 16 #define user_mode(regs) (((regs)->sr & 0x40000000)==0) 17 #define kernel_stack_pointer(_regs) ((unsigned long)(_regs)->regs[15]) 18 19 #define GET_FP(regs) ((regs)->regs[14]) 20 #define GET_USP(regs) ((regs)->regs[15]) 21 22 #define arch_has_single_step() (1) 23 24 /* 25 * kprobe-based event tracer support 26 */ 27 struct pt_regs_offset { 28 const char *name; 29 int offset; 30 }; 31 32 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} 33 #define REGS_OFFSET_NAME(num) \ 34 {.name = __stringify(r##num), .offset = offsetof(struct pt_regs, regs[num])} 35 #define TREGS_OFFSET_NAME(num) \ 36 {.name = __stringify(tr##num), .offset = offsetof(struct pt_regs, tregs[num])} 37 #define REG_OFFSET_END {.name = NULL, .offset = 0} 38 39 /* Query offset/name of register from its name/offset */ 40 extern int regs_query_register_offset(const char *name); 41 extern const char *regs_query_register_name(unsigned int offset); 42 43 extern const struct pt_regs_offset regoffset_table[]; 44 45 /** 46 * regs_get_register() - get register value from its offset 47 * @regs: pt_regs from which register value is gotten. 48 * @offset: offset number of the register. 49 * 50 * regs_get_register returns the value of a register. The @offset is the 51 * offset of the register in struct pt_regs address which specified by @regs. 52 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 53 */ 54 static inline unsigned long regs_get_register(struct pt_regs *regs, 55 unsigned int offset) 56 { 57 if (unlikely(offset > MAX_REG_OFFSET)) 58 return 0; 59 return *(unsigned long *)((unsigned long)regs + offset); 60 } 61 62 /** 63 * regs_within_kernel_stack() - check the address in the stack 64 * @regs: pt_regs which contains kernel stack pointer. 65 * @addr: address which is checked. 66 * 67 * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). 68 * If @addr is within the kernel stack, it returns true. If not, returns false. 69 */ 70 static inline int regs_within_kernel_stack(struct pt_regs *regs, 71 unsigned long addr) 72 { 73 return ((addr & ~(THREAD_SIZE - 1)) == 74 (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); 75 } 76 77 /** 78 * regs_get_kernel_stack_nth() - get Nth entry of the stack 79 * @regs: pt_regs which contains kernel stack pointer. 80 * @n: stack entry number. 81 * 82 * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which 83 * is specified by @regs. If the @n th entry is NOT in the kernel stack, 84 * this returns 0. 85 */ 86 static inline unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 87 unsigned int n) 88 { 89 unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); 90 addr += n; 91 if (regs_within_kernel_stack(regs, (unsigned long)addr)) 92 return *addr; 93 else 94 return 0; 95 } 96 97 struct perf_event; 98 struct perf_sample_data; 99 100 extern void ptrace_triggered(struct perf_event *bp, 101 struct perf_sample_data *data, struct pt_regs *regs); 102 103 #define task_pt_regs(task) \ 104 ((struct pt_regs *) (task_stack_page(task) + THREAD_SIZE) - 1) 105 106 static inline unsigned long profile_pc(struct pt_regs *regs) 107 { 108 unsigned long pc = regs->pc; 109 110 if (virt_addr_uncached(pc)) 111 return CAC_ADDR(pc); 112 113 return pc; 114 } 115 #define profile_pc profile_pc 116 117 #include <asm-generic/ptrace.h> 118 #endif /* __ASM_SH_PTRACE_H */ 119