2 * linux/arch/h8300/kernel/ptrace.c
4 * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
6 * This file is subject to the terms and conditions of the GNU General
7 * Public License. See the file COPYING in the main directory of
8 * this archive for more details.
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/ptrace.h>
14 #include <linux/audit.h>
15 #include <linux/tracehook.h>
16 #include <linux/regset.h>
17 #include <linux/elf.h>
19 #define CCR_MASK 0x6f /* mode/imask not set */
20 #define EXR_MASK 0x80 /* modify only T */
22 #define PT_REG(r) offsetof(struct pt_regs, r)
24 extern void user_disable_single_step(struct task_struct *child);
26 /* Mapping from PT_xxx to the stack offset at which the register is
27 saved. Notice that usp has no stack-slot and needs to be treated
28 specially (see get_reg/put_reg below). */
29 static const int register_offset[] = {
30 PT_REG(er1), PT_REG(er2), PT_REG(er3), PT_REG(er4),
31 PT_REG(er5), PT_REG(er6), PT_REG(er0), -1,
32 PT_REG(orig_er0), PT_REG(ccr), PT_REG(pc),
33 #if defined(CONFIG_CPU_H8S)
39 long h8300_get_reg(struct task_struct *task, int regno)
43 return task->thread.usp + sizeof(long)*2;
46 return *(unsigned short *)(task->thread.esp0 +
47 register_offset[regno]);
49 return *(unsigned long *)(task->thread.esp0 +
50 register_offset[regno]);
54 int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
56 unsigned short oldccr;
57 unsigned short oldexr;
61 task->thread.usp = data - sizeof(long)*2;
63 oldccr = *(unsigned short *)(task->thread.esp0 +
64 register_offset[regno]);
68 *(unsigned short *)(task->thread.esp0 +
69 register_offset[regno]) = data;
72 oldexr = *(unsigned short *)(task->thread.esp0 +
73 register_offset[regno]);
77 *(unsigned short *)(task->thread.esp0 +
78 register_offset[regno]) = data;
81 *(unsigned long *)(task->thread.esp0 +
82 register_offset[regno]) = data;
88 static int regs_get(struct task_struct *target,
89 const struct user_regset *regset,
90 unsigned int pos, unsigned int count,
91 void *kbuf, void __user *ubuf)
94 struct user_regs_struct regs;
95 long *reg = (long *)®s;
97 /* build user regs in buffer */
98 for (r = 0; r < ARRAY_SIZE(register_offset); r++)
99 *reg++ = h8300_get_reg(target, r);
101 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
102 ®s, 0, sizeof(regs));
105 static int regs_set(struct task_struct *target,
106 const struct user_regset *regset,
107 unsigned int pos, unsigned int count,
108 const void *kbuf, const void __user *ubuf)
112 struct user_regs_struct regs;
115 /* build user regs in buffer */
116 for (reg = (long *)®s, r = 0; r < ARRAY_SIZE(register_offset); r++)
117 *reg++ = h8300_get_reg(target, r);
119 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
120 ®s, 0, sizeof(regs));
124 /* write back to pt_regs */
125 for (reg = (long *)®s, r = 0; r < ARRAY_SIZE(register_offset); r++)
126 h8300_put_reg(target, r, *reg++);
134 static const struct user_regset h8300_regsets[] = {
136 .core_note_type = NT_PRSTATUS,
138 .size = sizeof(long),
139 .align = sizeof(long),
145 static const struct user_regset_view user_h8300_native_view = {
147 .e_machine = EM_H8_300,
148 .regsets = h8300_regsets,
149 .n = ARRAY_SIZE(h8300_regsets),
152 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
154 return &user_h8300_native_view;
157 void ptrace_disable(struct task_struct *child)
159 user_disable_single_step(child);
162 long arch_ptrace(struct task_struct *child, long request,
163 unsigned long addr, unsigned long data)
169 ret = ptrace_request(child, request, addr, data);
175 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
179 if (test_thread_flag(TIF_SYSCALL_TRACE) &&
180 tracehook_report_syscall_entry(regs))
182 * Tracing decided this syscall should not happen.
183 * We'll return a bogus call number to get an ENOSYS
184 * error, but leave the original number in regs->regs[0].
188 audit_syscall_entry(regs->er1, regs->er2, regs->er3,
189 regs->er4, regs->er5);
191 return ret ?: regs->er0;
194 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
198 audit_syscall_exit(regs);
200 step = test_thread_flag(TIF_SINGLESTEP);
201 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
202 tracehook_report_syscall_exit(regs, step);