2 * linux/arch/m68k/kernel/ptrace.c
4 * Copyright (C) 1994 by Hamish Macdonald
5 * Taken from linux/kernel/ptrace.c and modified for M680x0.
6 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of
10 * this archive for more details.
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/sched/task_stack.h>
17 #include <linux/smp.h>
18 #include <linux/errno.h>
19 #include <linux/ptrace.h>
20 #include <linux/user.h>
21 #include <linux/signal.h>
22 #include <linux/regset.h>
23 #include <linux/elf.h>
25 #include <linux/uaccess.h>
27 #include <asm/processor.h>
30 * does not yet catch signals sent when the child dies.
31 * in exit.c or in signal.c.
34 /* determines which bits in the SR the user has access to. */
35 /* 1 = access 0 = no access */
36 #define SR_MASK 0x001f
38 /* sets the trace bits. */
39 #define TRACE_BITS 0xC000
43 /* Find the stack offset for a register, relative to thread.esp0. */
44 #define PT_REG(reg) ((long)&((struct pt_regs *)0)->reg)
45 #define SW_REG(reg) ((long)&((struct switch_stack *)0)->reg \
46 - sizeof(struct switch_stack))
47 /* Mapping from PT_xxx to the stack offset at which the register is
48 saved. Notice that usp has no stack-slot and needs to be treated
49 specially (see get_reg/put_reg below). */
50 static const int regoff[] = {
67 [16] = PT_REG(orig_d0),
73 * Get contents of register REGNO in task TASK.
75 static inline long get_reg(struct task_struct *task, int regno)
80 addr = &task->thread.usp;
81 else if (regno < ARRAY_SIZE(regoff))
82 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
85 /* Need to take stkadj into account. */
86 if (regno == PT_SR || regno == PT_PC) {
87 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
88 addr = (unsigned long *) ((unsigned long)addr + stkadj);
89 /* The sr is actually a 16 bit register. */
91 return *(unsigned short *)addr;
97 * Write contents of register REGNO in task TASK.
99 static inline int put_reg(struct task_struct *task, int regno,
105 addr = &task->thread.usp;
106 else if (regno < ARRAY_SIZE(regoff))
107 addr = (unsigned long *)(task->thread.esp0 + regoff[regno]);
110 /* Need to take stkadj into account. */
111 if (regno == PT_SR || regno == PT_PC) {
112 long stkadj = *(long *)(task->thread.esp0 + PT_REG(stkadj));
113 addr = (unsigned long *) ((unsigned long)addr + stkadj);
114 /* The sr is actually a 16 bit register. */
115 if (regno == PT_SR) {
116 *(unsigned short *)addr = data;
125 * Make sure the single step bit is not set.
127 static inline void singlestep_disable(struct task_struct *child)
129 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
130 put_reg(child, PT_SR, tmp);
131 clear_tsk_thread_flag(child, TIF_DELAYED_TRACE);
135 * Called by kernel/ptrace.c when detaching..
137 void ptrace_disable(struct task_struct *child)
139 singlestep_disable(child);
142 void user_enable_single_step(struct task_struct *child)
144 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
145 put_reg(child, PT_SR, tmp | T1_BIT);
146 set_tsk_thread_flag(child, TIF_DELAYED_TRACE);
150 void user_enable_block_step(struct task_struct *child)
152 unsigned long tmp = get_reg(child, PT_SR) & ~TRACE_BITS;
153 put_reg(child, PT_SR, tmp | T0_BIT);
157 void user_disable_single_step(struct task_struct *child)
159 singlestep_disable(child);
162 long arch_ptrace(struct task_struct *child, long request,
163 unsigned long addr, unsigned long data)
167 int regno = addr >> 2; /* temporary hack. */
168 unsigned long __user *datap = (unsigned long __user *) data;
171 /* read the word at location addr in the USER area. */
176 if (regno >= 0 && regno < 19) {
177 tmp = get_reg(child, regno);
178 } else if (regno >= 21 && regno < 49) {
179 tmp = child->thread.fp[regno - 21];
180 /* Convert internal fpu reg representation
181 * into long double format
183 if (FPU_IS_EMU && (regno < 45) && !(regno % 3))
184 tmp = ((tmp & 0xffff0000) << 15) |
185 ((tmp & 0x0000ffff) << 16);
187 } else if (regno == 49) {
188 tmp = child->mm->start_code;
189 } else if (regno == 50) {
190 tmp = child->mm->start_data;
191 } else if (regno == 51) {
192 tmp = child->mm->end_code;
196 ret = put_user(tmp, datap);
200 /* write the word at location addr in the USER area */
204 if (regno == PT_SR) {
206 data |= get_reg(child, PT_SR) & ~SR_MASK;
208 if (regno >= 0 && regno < 19) {
209 if (put_reg(child, regno, data))
211 } else if (regno >= 21 && regno < 48) {
212 /* Convert long double format
213 * into internal fpu reg representation
215 if (FPU_IS_EMU && (regno < 45) && !(regno % 3)) {
217 data = (data & 0xffff0000) |
218 ((data & 0x0000ffff) >> 1);
220 child->thread.fp[regno - 21] = data;
225 case PTRACE_GETREGS: /* Get all gp regs from the child. */
226 for (i = 0; i < 19; i++) {
227 tmp = get_reg(child, i);
228 ret = put_user(tmp, datap);
235 case PTRACE_SETREGS: /* Set all gp regs in the child. */
236 for (i = 0; i < 19; i++) {
237 ret = get_user(tmp, datap);
242 tmp |= get_reg(child, PT_SR) & ~SR_MASK;
244 put_reg(child, i, tmp);
249 case PTRACE_GETFPREGS: /* Get the child FPU state. */
250 if (copy_to_user(datap, &child->thread.fp,
251 sizeof(struct user_m68kfp_struct)))
255 case PTRACE_SETFPREGS: /* Set the child FPU state. */
256 if (copy_from_user(&child->thread.fp, datap,
257 sizeof(struct user_m68kfp_struct)))
261 case PTRACE_GET_THREAD_AREA:
262 ret = put_user(task_thread_info(child)->tp_value, datap);
266 ret = ptrace_request(child, request, addr, data);
275 asmlinkage int syscall_trace_enter(void)
279 if (test_thread_flag(TIF_SYSCALL_TRACE))
280 ret = ptrace_report_syscall_entry(task_pt_regs(current));
284 asmlinkage void syscall_trace_leave(void)
286 if (test_thread_flag(TIF_SYSCALL_TRACE))
287 ptrace_report_syscall_exit(task_pt_regs(current), 0);
290 #if defined(CONFIG_BINFMT_ELF_FDPIC) && defined(CONFIG_ELF_CORE)
292 * Currently the only thing that needs to use regsets for m68k is the
293 * coredump support of the elf_fdpic loader. Implement the minimum
294 * definitions required for that.
296 static int m68k_regset_get(struct task_struct *target,
297 const struct user_regset *regset,
300 struct pt_regs *ptregs = task_pt_regs(target);
301 u32 uregs[ELF_NGREG];
303 ELF_CORE_COPY_REGS(uregs, ptregs);
304 return membuf_write(&to, uregs, sizeof(uregs));
314 static const struct user_regset m68k_user_regsets[] = {
316 .core_note_type = NT_PRSTATUS,
319 .align = sizeof(u16),
320 .regset_get = m68k_regset_get,
324 .core_note_type = NT_PRFPREG,
325 .n = sizeof(struct user_m68kfp_struct) / sizeof(u32),
327 .align = sizeof(u32),
329 #endif /* CONFIG_FPU */
332 static const struct user_regset_view user_m68k_view = {
335 .ei_osabi = ELF_OSABI,
336 .regsets = m68k_user_regsets,
337 .n = ARRAY_SIZE(m68k_user_regsets)
340 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
342 return &user_m68k_view;
344 #endif /* CONFIG_BINFMT_ELF_FDPIC && CONFIG_ELF_CORE */