2 * Copyright (C) 2005-2012 Imagination Technologies Ltd.
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License. See the file COPYING in the main directory of
6 * this archive for more details.
9 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/ptrace.h>
13 #include <linux/user.h>
14 #include <linux/regset.h>
15 #include <linux/tracehook.h>
16 #include <linux/elf.h>
17 #include <linux/uaccess.h>
18 #include <linux/sched/task_stack.h>
20 #include <trace/syscall.h>
22 #define CREATE_TRACE_POINTS
23 #include <trace/events/syscalls.h>
26 * user_regset definitions.
29 static unsigned long user_txstatus(const struct pt_regs *regs)
31 unsigned long data = (unsigned long)regs->ctx.Flags;
33 if (regs->ctx.SaveMask & TBICTX_CBUF_BIT)
34 data |= USER_GP_REGS_STATUS_CATCH_BIT;
39 int metag_gp_regs_copyout(const struct pt_regs *regs,
40 unsigned int pos, unsigned int count,
41 void *kbuf, void __user *ubuf)
48 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
49 regs->ctx.DX, 0, 4*16);
53 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
54 regs->ctx.AX, 4*16, 4*20);
58 if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
59 ptr = regs->ctx.Ext.Ctx.pExt;
61 ptr = ®s->ctx.Ext.AX2;
62 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
67 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
68 ®s->ctx.AX3, 4*22, 4*24);
72 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
73 ®s->ctx.CurrPC, 4*24, 4*25);
77 data = user_txstatus(regs);
78 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
82 /* TXRPT, TXBPOBITS, TXMODE */
83 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
84 ®s->ctx.CurrRPT, 4*26, 4*29);
88 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
94 int metag_gp_regs_copyin(struct pt_regs *regs,
95 unsigned int pos, unsigned int count,
96 const void *kbuf, const void __user *ubuf)
103 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
104 regs->ctx.DX, 0, 4*16);
108 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
109 regs->ctx.AX, 4*16, 4*20);
113 if (regs->ctx.SaveMask & TBICTX_XEXT_BIT)
114 ptr = regs->ctx.Ext.Ctx.pExt;
116 ptr = ®s->ctx.Ext.AX2;
117 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
122 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
123 ®s->ctx.AX3, 4*22, 4*24);
127 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
128 ®s->ctx.CurrPC, 4*24, 4*25);
132 data = user_txstatus(regs);
133 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
137 regs->ctx.Flags = data & 0xffff;
138 if (data & USER_GP_REGS_STATUS_CATCH_BIT)
139 regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBUF_BIT;
141 regs->ctx.SaveMask &= ~TBICTX_CBUF_BIT;
142 /* TXRPT, TXBPOBITS, TXMODE */
143 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
144 ®s->ctx.CurrRPT, 4*26, 4*29);
149 static int metag_gp_regs_get(struct task_struct *target,
150 const struct user_regset *regset,
151 unsigned int pos, unsigned int count,
152 void *kbuf, void __user *ubuf)
154 const struct pt_regs *regs = task_pt_regs(target);
155 return metag_gp_regs_copyout(regs, pos, count, kbuf, ubuf);
158 static int metag_gp_regs_set(struct task_struct *target,
159 const struct user_regset *regset,
160 unsigned int pos, unsigned int count,
161 const void *kbuf, const void __user *ubuf)
163 struct pt_regs *regs = task_pt_regs(target);
164 return metag_gp_regs_copyin(regs, pos, count, kbuf, ubuf);
167 int metag_cb_regs_copyout(const struct pt_regs *regs,
168 unsigned int pos, unsigned int count,
169 void *kbuf, void __user *ubuf)
174 if (regs->ctx.SaveMask & TBICTX_XCBF_BIT)
175 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
176 regs->extcb0, 0, 4*4);
178 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
183 int metag_cb_regs_copyin(struct pt_regs *regs,
184 unsigned int pos, unsigned int count,
185 const void *kbuf, const void __user *ubuf)
190 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
191 regs->extcb0, 0, 4*4);
195 static int metag_cb_regs_get(struct task_struct *target,
196 const struct user_regset *regset,
197 unsigned int pos, unsigned int count,
198 void *kbuf, void __user *ubuf)
200 const struct pt_regs *regs = task_pt_regs(target);
201 return metag_cb_regs_copyout(regs, pos, count, kbuf, ubuf);
204 static int metag_cb_regs_set(struct task_struct *target,
205 const struct user_regset *regset,
206 unsigned int pos, unsigned int count,
207 const void *kbuf, const void __user *ubuf)
209 struct pt_regs *regs = task_pt_regs(target);
210 return metag_cb_regs_copyin(regs, pos, count, kbuf, ubuf);
213 int metag_rp_state_copyout(const struct pt_regs *regs,
214 unsigned int pos, unsigned int count,
215 void *kbuf, void __user *ubuf)
221 /* Empty read pipeline */
222 if (!(regs->ctx.SaveMask & TBICTX_CBRP_BIT)) {
223 ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
228 mask = (regs->ctx.CurrDIVTIME & TXDIVTIME_RPMASK_BITS) >>
231 /* Read pipeline entries */
232 ptr = (void *)®s->extcb0[1];
233 for (i = 0; i < 6; ++i, ++ptr) {
235 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
236 ptr, 8*i, 8*(i + 1));
238 ret = user_regset_copyout_zero(&pos, &count, &kbuf,
239 &ubuf, 8*i, 8*(i + 1));
243 /* Mask of entries */
244 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
250 int metag_rp_state_copyin(struct pt_regs *regs,
251 unsigned int pos, unsigned int count,
252 const void *kbuf, const void __user *ubuf)
254 struct user_rp_state rp;
255 unsigned long long *ptr;
260 /* Read the entire pipeline before making any changes */
261 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
266 /* Write pipeline entries */
267 ptr = (void *)®s->extcb0[1];
268 for (i = 0; i < 6; ++i, ++ptr)
269 if (rp.mask & (1 << i))
270 *ptr = rp.entries[i];
272 /* Update RPMask in TXDIVTIME */
273 regs->ctx.CurrDIVTIME &= ~TXDIVTIME_RPMASK_BITS;
274 regs->ctx.CurrDIVTIME |= (rp.mask << TXDIVTIME_RPMASK_S)
275 & TXDIVTIME_RPMASK_BITS;
277 /* Set/clear flags to indicate catch/read pipeline state */
279 regs->ctx.SaveMask |= TBICTX_XCBF_BIT | TBICTX_CBRP_BIT;
281 regs->ctx.SaveMask &= ~TBICTX_CBRP_BIT;
286 static int metag_rp_state_get(struct task_struct *target,
287 const struct user_regset *regset,
288 unsigned int pos, unsigned int count,
289 void *kbuf, void __user *ubuf)
291 const struct pt_regs *regs = task_pt_regs(target);
292 return metag_rp_state_copyout(regs, pos, count, kbuf, ubuf);
295 static int metag_rp_state_set(struct task_struct *target,
296 const struct user_regset *regset,
297 unsigned int pos, unsigned int count,
298 const void *kbuf, const void __user *ubuf)
300 struct pt_regs *regs = task_pt_regs(target);
301 return metag_rp_state_copyin(regs, pos, count, kbuf, ubuf);
304 static int metag_tls_get(struct task_struct *target,
305 const struct user_regset *regset,
306 unsigned int pos, unsigned int count,
307 void *kbuf, void __user *ubuf)
309 void __user *tls = target->thread.tls_ptr;
310 return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
313 static int metag_tls_set(struct task_struct *target,
314 const struct user_regset *regset,
315 unsigned int pos, unsigned int count,
316 const void *kbuf, const void __user *ubuf)
319 void __user *tls = target->thread.tls_ptr;
321 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
325 target->thread.tls_ptr = tls;
336 static const struct user_regset metag_regsets[] = {
338 .core_note_type = NT_PRSTATUS,
340 .size = sizeof(long),
341 .align = sizeof(long long),
342 .get = metag_gp_regs_get,
343 .set = metag_gp_regs_set,
346 .core_note_type = NT_METAG_CBUF,
347 .n = sizeof(struct user_cb_regs) / sizeof(long),
348 .size = sizeof(long),
349 .align = sizeof(long long),
350 .get = metag_cb_regs_get,
351 .set = metag_cb_regs_set,
353 [REGSET_READPIPE] = {
354 .core_note_type = NT_METAG_RPIPE,
355 .n = sizeof(struct user_rp_state) / sizeof(long),
356 .size = sizeof(long),
357 .align = sizeof(long long),
358 .get = metag_rp_state_get,
359 .set = metag_rp_state_set,
362 .core_note_type = NT_METAG_TLS,
364 .size = sizeof(void *),
365 .align = sizeof(void *),
366 .get = metag_tls_get,
367 .set = metag_tls_set,
371 static const struct user_regset_view user_metag_view = {
373 .e_machine = EM_METAG,
374 .regsets = metag_regsets,
375 .n = ARRAY_SIZE(metag_regsets)
378 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
380 return &user_metag_view;
384 * Called by kernel/ptrace.c when detaching..
386 * Make sure single step bits etc are not set.
388 void ptrace_disable(struct task_struct *child)
390 /* nothing to do.. */
393 long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
400 ret = ptrace_request(child, request, addr, data);
407 int syscall_trace_enter(struct pt_regs *regs)
411 if (test_thread_flag(TIF_SYSCALL_TRACE))
412 ret = tracehook_report_syscall_entry(regs);
414 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
415 trace_sys_enter(regs, regs->ctx.DX[0].U1);
417 return ret ? -1 : regs->ctx.DX[0].U1;
420 void syscall_trace_leave(struct pt_regs *regs)
422 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
423 trace_sys_exit(regs, regs->ctx.DX[0].U1);
425 if (test_thread_flag(TIF_SYSCALL_TRACE))
426 tracehook_report_syscall_exit(regs, 0);