1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_PTRACE_H 4 #define __ASM_CSKY_PTRACE_H 5 6 #include <uapi/asm/ptrace.h> 7 #include <asm/traps.h> 8 #include <linux/types.h> 9 #include <linux/compiler.h> 10 11 #ifndef __ASSEMBLY__ 12 13 #define PS_S 0x80000000 /* Supervisor Mode */ 14 15 #define USR_BKPT 0x1464 16 17 #define arch_has_single_step() (1) 18 #define current_pt_regs() \ 19 ({ (struct pt_regs *)((char *)current_thread_info() + THREAD_SIZE) - 1; }) 20 21 #define user_stack_pointer(regs) ((regs)->usp) 22 23 #define user_mode(regs) (!((regs)->sr & PS_S)) 24 #define instruction_pointer(regs) ((regs)->pc) 25 #define profile_pc(regs) instruction_pointer(regs) 26 #define trap_no(regs) ((regs->sr >> 16) & 0xff) 27 28 static inline void instruction_pointer_set(struct pt_regs *regs, 29 unsigned long val) 30 { 31 regs->pc = val; 32 } 33 34 #if defined(__CSKYABIV2__) 35 #define MAX_REG_OFFSET offsetof(struct pt_regs, dcsr) 36 #else 37 #define MAX_REG_OFFSET offsetof(struct pt_regs, regs[9]) 38 #endif 39 40 static inline bool in_syscall(struct pt_regs const *regs) 41 { 42 return ((regs->sr >> 16) & 0xff) == VEC_TRAP0; 43 } 44 45 static inline void forget_syscall(struct pt_regs *regs) 46 { 47 regs->sr &= ~(0xff << 16); 48 } 49 50 static inline unsigned long regs_return_value(struct pt_regs *regs) 51 { 52 return regs->a0; 53 } 54 55 static inline void regs_set_return_value(struct pt_regs *regs, 56 unsigned long val) 57 { 58 regs->a0 = val; 59 } 60 61 /* Valid only for Kernel mode traps. */ 62 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs) 63 { 64 return regs->usp; 65 } 66 67 static inline unsigned long frame_pointer(struct pt_regs *regs) 68 { 69 return regs->regs[4]; 70 } 71 static inline void frame_pointer_set(struct pt_regs *regs, 72 unsigned long val) 73 { 74 regs->regs[4] = val; 75 } 76 77 extern int regs_query_register_offset(const char *name); 78 extern unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, 79 unsigned int n); 80 81 /* 82 * regs_get_register() - get register value from its offset 83 * @regs: pt_regs from which register value is gotten 84 * @offset: offset of the register. 85 * 86 * regs_get_register returns the value of a register whose offset from @regs. 87 * The @offset is the offset of the register in struct pt_regs. 88 * If @offset is bigger than MAX_REG_OFFSET, this returns 0. 89 */ 90 static inline unsigned long regs_get_register(struct pt_regs *regs, 91 unsigned int offset) 92 { 93 if (unlikely(offset > MAX_REG_OFFSET)) 94 return 0; 95 96 return *(unsigned long *)((unsigned long)regs + offset); 97 } 98 99 asmlinkage int syscall_trace_enter(struct pt_regs *regs); 100 asmlinkage void syscall_trace_exit(struct pt_regs *regs); 101 #endif /* __ASSEMBLY__ */ 102 #endif /* __ASM_CSKY_PTRACE_H */ 103