2 * Port on Texas Instruments TMS320C6x architecture
4 * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
5 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7 * Updated for 2.6.34: Mark Salter <msalter@redhat.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/ptrace.h>
14 #include <linux/tracehook.h>
15 #include <linux/regset.h>
16 #include <linux/elf.h>
17 #include <linux/sched/task_stack.h>
19 #include <asm/cacheflush.h>
21 #define PT_REG_SIZE (sizeof(struct pt_regs))
24 * Called by kernel/ptrace.c when detaching.
26 void ptrace_disable(struct task_struct *child)
32 * Get a register number from live pt_regs for the specified task.
34 static inline long get_reg(struct task_struct *task, int regno)
36 long *addr = (long *)task_pt_regs(task);
38 if (regno == PT_TSR || regno == PT_CSR)
45 * Write contents of register REGNO in task TASK.
47 static inline int put_reg(struct task_struct *task,
51 unsigned long *addr = (unsigned long *)task_pt_regs(task);
53 if (regno != PT_TSR && regno != PT_CSR)
59 /* regset get/set implementations */
61 static int gpr_get(struct task_struct *target,
62 const struct user_regset *regset,
63 unsigned int pos, unsigned int count,
64 void *kbuf, void __user *ubuf)
66 struct pt_regs *regs = task_pt_regs(target);
68 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
73 static int gpr_set(struct task_struct *target,
74 const struct user_regset *regset,
75 unsigned int pos, unsigned int count,
76 const void *kbuf, const void __user *ubuf)
79 struct pt_regs *regs = task_pt_regs(target);
81 /* Don't copyin TSR or CSR */
82 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
84 0, PT_TSR * sizeof(long));
88 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
89 PT_TSR * sizeof(long),
90 (PT_TSR + 1) * sizeof(long));
94 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
96 (PT_TSR + 1) * sizeof(long),
97 PT_CSR * sizeof(long));
101 ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
102 PT_CSR * sizeof(long),
103 (PT_CSR + 1) * sizeof(long));
107 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
109 (PT_CSR + 1) * sizeof(long), -1);
117 static const struct user_regset c6x_regsets[] = {
119 .core_note_type = NT_PRSTATUS,
122 .align = sizeof(u32),
128 static const struct user_regset_view user_c6x_native_view = {
130 .e_machine = EM_TI_C6000,
131 .regsets = c6x_regsets,
132 .n = ARRAY_SIZE(c6x_regsets),
135 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
137 return &user_c6x_native_view;
141 * Perform ptrace request
143 long arch_ptrace(struct task_struct *child, long request,
144 unsigned long addr, unsigned long data)
150 * write the word at location addr.
152 case PTRACE_POKETEXT:
153 ret = generic_ptrace_pokedata(child, addr, data);
154 if (ret == 0 && request == PTRACE_POKETEXT)
155 flush_icache_range(addr, addr + 4);
158 ret = ptrace_request(child, request, addr, data);
166 * handle tracing of system call entry
167 * - return the revised system call number or ULONG_MAX to cause ENOSYS
169 asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
171 if (tracehook_report_syscall_entry(regs))
172 /* tracing decided this syscall should not happen, so
173 * We'll return a bogus call number to get an ENOSYS
174 * error, but leave the original number in
183 * handle tracing of system call exit
185 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
187 tracehook_report_syscall_exit(regs, 0);