2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
14 * Copied from i386: Ross Biro 1/23/92
17 #include <linux/kernel.h>
18 #include <linux/ptrace.h>
19 #include <linux/kprobes.h>
20 #include <linux/compat.h>
21 #include <linux/uaccess.h>
22 #include <linux/regset.h>
23 #include <linux/elf.h>
24 #include <asm/traps.h>
25 #include <arch/chip.h>
27 void user_enable_single_step(struct task_struct *child)
29 set_tsk_thread_flag(child, TIF_SINGLESTEP);
32 void user_disable_single_step(struct task_struct *child)
34 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
38 * Called by kernel/ptrace.c when detaching..
40 void ptrace_disable(struct task_struct *child)
42 clear_tsk_thread_flag(child, TIF_SINGLESTEP);
45 * These two are currently unused, but will be set by arch_ptrace()
46 * and used in the syscall assembly when we do support them.
48 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
52 * Get registers from task and ready the result for userspace.
53 * Note that we localize the API issues to getregs() and putregs() at
54 * some cost in performance, e.g. we need a full pt_regs copy for
55 * PEEKUSR, and two copies for POKEUSR. But in general we expect
56 * GETREGS/PUTREGS to be the API of choice anyway.
58 static char *getregs(struct task_struct *child, struct pt_regs *uregs)
60 *uregs = *task_pt_regs(child);
62 /* Set up flags ABI bits. */
65 if (task_thread_info(child)->status & TS_COMPAT)
66 uregs->flags |= PT_FLAGS_COMPAT;
72 /* Put registers back to task. */
73 static void putregs(struct task_struct *child, struct pt_regs *uregs)
75 struct pt_regs *regs = task_pt_regs(child);
77 /* Don't allow overwriting the kernel-internal flags word. */
78 uregs->flags = regs->flags;
80 /* Only allow setting the ICS bit in the ex1 word. */
81 uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
90 static int tile_gpr_get(struct task_struct *target,
91 const struct user_regset *regset,
92 unsigned int pos, unsigned int count,
93 void *kbuf, void __user *ubuf)
97 getregs(target, ®s);
99 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, ®s, 0,
103 static int tile_gpr_set(struct task_struct *target,
104 const struct user_regset *regset,
105 unsigned int pos, unsigned int count,
106 const void *kbuf, const void __user *ubuf)
111 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®s, 0,
116 putregs(target, ®s);
121 static const struct user_regset tile_user_regset[] = {
123 .core_note_type = NT_PRSTATUS,
125 .size = sizeof(elf_greg_t),
126 .align = sizeof(elf_greg_t),
132 static const struct user_regset_view tile_user_regset_view = {
133 .name = CHIP_ARCH_NAME,
134 .e_machine = ELF_ARCH,
135 .ei_osabi = ELF_OSABI,
136 .regsets = tile_user_regset,
137 .n = ARRAY_SIZE(tile_user_regset),
140 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
142 return &tile_user_regset_view;
145 long arch_ptrace(struct task_struct *child, long request,
146 unsigned long addr, unsigned long data)
148 unsigned long __user *datap = (long __user __force *)data;
152 struct pt_regs copyregs;
156 case PTRACE_PEEKUSR: /* Read register from pt_regs. */
157 if (addr >= PTREGS_SIZE)
159 childreg = getregs(child, ©regs) + addr;
161 if (is_compat_task()) {
162 if (addr & (sizeof(compat_long_t)-1))
164 ret = put_user(*(compat_long_t *)childreg,
165 (compat_long_t __user *)datap);
169 if (addr & (sizeof(long)-1))
171 ret = put_user(*(long *)childreg, datap);
175 case PTRACE_POKEUSR: /* Write register in pt_regs. */
176 if (addr >= PTREGS_SIZE)
178 childreg = getregs(child, ©regs) + addr;
180 if (is_compat_task()) {
181 if (addr & (sizeof(compat_long_t)-1))
183 *(compat_long_t *)childreg = data;
187 if (addr & (sizeof(long)-1))
189 *(long *)childreg = data;
191 putregs(child, ©regs);
195 case PTRACE_GETREGS: /* Get all registers from the child. */
196 ret = copy_regset_to_user(child, &tile_user_regset_view,
198 sizeof(struct pt_regs), datap);
201 case PTRACE_SETREGS: /* Set all registers in the child. */
202 ret = copy_regset_from_user(child, &tile_user_regset_view,
204 sizeof(struct pt_regs), datap);
207 case PTRACE_GETFPREGS: /* Get the child FPU state. */
208 case PTRACE_SETFPREGS: /* Set the child FPU state. */
211 case PTRACE_SETOPTIONS:
212 /* Support TILE-specific ptrace options. */
213 BUILD_BUG_ON(PTRACE_O_MASK_TILE & PTRACE_O_MASK);
214 tmp = data & PTRACE_O_MASK_TILE;
215 data &= ~PTRACE_O_MASK_TILE;
216 ret = ptrace_request(child, request, addr, data);
218 unsigned int flags = child->ptrace;
219 flags &= ~(PTRACE_O_MASK_TILE << PT_OPT_FLAG_SHIFT);
220 flags |= (tmp << PT_OPT_FLAG_SHIFT);
221 child->ptrace = flags;
227 if (task_thread_info(current)->status & TS_COMPAT) {
228 ret = compat_ptrace_request(child, request,
233 ret = ptrace_request(child, request, addr, data);
241 /* Not used; we handle compat issues in arch_ptrace() directly. */
242 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
243 compat_ulong_t addr, compat_ulong_t data)
249 void do_syscall_trace(void)
251 if (!test_thread_flag(TIF_SYSCALL_TRACE))
254 if (!(current->ptrace & PT_PTRACED))
258 * The 0x80 provides a way for the tracing parent to distinguish
259 * between a syscall stop and SIGTRAP delivery
261 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
264 * this isn't the same as continuing with a signal, but it will do
265 * for normal use. strace only continues with a signal if the
266 * stopping signal is not SIGTRAP. -brl
268 if (current->exit_code) {
269 send_sig(current->exit_code, current, 1);
270 current->exit_code = 0;
274 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
278 memset(&info, 0, sizeof(info));
279 info.si_signo = SIGTRAP;
280 info.si_code = TRAP_BRKPT;
281 info.si_addr = (void __user *) regs->pc;
283 /* Send us the fakey SIGTRAP */
284 force_sig_info(SIGTRAP, &info, tsk);
287 /* Handle synthetic interrupt delivered only by the simulator. */
288 void __kprobes do_breakpoint(struct pt_regs* regs, int fault_num)
290 send_sigtrap(current, regs, fault_num);