blob: 33eea4c16f121bde393508ed132bab7bd4d16d47 [file] [log] [blame]
Chris Zankel5a0015d2005-06-23 22:01:16 -07001// TODO some minor issues
2/*
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
Chris Zankelc658eac2008-02-12 13:17:07 -08007 * Copyright (C) 2001 - 2007 Tensilica Inc.
Chris Zankel5a0015d2005-06-23 22:01:16 -07008 *
9 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
10 * Chris Zankel <chris@zankel.net>
11 * Scott Foehner<sfoehner@yahoo.com>,
12 * Kevin Chea
13 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
14 */
15
Chris Zankel5a0015d2005-06-23 22:01:16 -070016#include <linux/kernel.h>
17#include <linux/sched.h>
18#include <linux/mm.h>
19#include <linux/errno.h>
20#include <linux/ptrace.h>
21#include <linux/smp.h>
Chris Zankel5a0015d2005-06-23 22:01:16 -070022#include <linux/security.h>
Jesper Juhl0ee23b52005-06-30 02:58:56 -070023#include <linux/signal.h>
Chris Zankel5a0015d2005-06-23 22:01:16 -070024
25#include <asm/pgtable.h>
26#include <asm/page.h>
Chris Zankel5a0015d2005-06-23 22:01:16 -070027#include <asm/uaccess.h>
28#include <asm/ptrace.h>
29#include <asm/elf.h>
Chris Zankelc658eac2008-02-12 13:17:07 -080030#include <asm/coprocessor.h>
Chris Zankel5a0015d2005-06-23 22:01:16 -070031
Christoph Hellwig6d75ca12010-03-10 15:22:57 -080032
33void user_enable_single_step(struct task_struct *child)
34{
35 child->ptrace |= PT_SINGLESTEP;
36}
37
38void user_disable_single_step(struct task_struct *child)
39{
40 child->ptrace &= ~PT_SINGLESTEP;
41}
42
Chris Zankel5a0015d2005-06-23 22:01:16 -070043/*
Chris Zankelc658eac2008-02-12 13:17:07 -080044 * Called by kernel/ptrace.c when detaching to disable single stepping.
Chris Zankel5a0015d2005-06-23 22:01:16 -070045 */
46
47void ptrace_disable(struct task_struct *child)
48{
49 /* Nothing to do.. */
50}
51
Chris Zankelc658eac2008-02-12 13:17:07 -080052int ptrace_getregs(struct task_struct *child, void __user *uregs)
Chris Zankel5a0015d2005-06-23 22:01:16 -070053{
Chris Zankelc658eac2008-02-12 13:17:07 -080054 struct pt_regs *regs = task_pt_regs(child);
55 xtensa_gregset_t __user *gregset = uregs;
Chris Zankelc658eac2008-02-12 13:17:07 -080056 unsigned long wm = regs->wmask;
Chris Zankel42086ce2008-01-28 15:55:01 -080057 unsigned long wb = regs->windowbase;
58 int live, i;
Chris Zankel5a0015d2005-06-23 22:01:16 -070059
Chris Zankelc658eac2008-02-12 13:17:07 -080060 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
61 return -EIO;
Chris Zankel5a0015d2005-06-23 22:01:16 -070062
Chris Zankel42086ce2008-01-28 15:55:01 -080063 __put_user(regs->pc, &gregset->pc);
64 __put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
65 __put_user(regs->lbeg, &gregset->lbeg);
66 __put_user(regs->lend, &gregset->lend);
67 __put_user(regs->lcount, &gregset->lcount);
68 __put_user(regs->windowstart, &gregset->windowstart);
69 __put_user(regs->windowbase, &gregset->windowbase);
Chris Zankel5a0015d2005-06-23 22:01:16 -070070
Chris Zankelc658eac2008-02-12 13:17:07 -080071 live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
Chris Zankelc658eac2008-02-12 13:17:07 -080072
Chris Zankel42086ce2008-01-28 15:55:01 -080073 for (i = 0; i < live; i++)
74 __put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
75 for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
76 __put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
77
78 return 0;
Chris Zankelc658eac2008-02-12 13:17:07 -080079}
80
81int ptrace_setregs(struct task_struct *child, void __user *uregs)
82{
83 struct pt_regs *regs = task_pt_regs(child);
84 xtensa_gregset_t *gregset = uregs;
85 const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
Chris Zankelc658eac2008-02-12 13:17:07 -080086 unsigned long ps;
Chris Zankel42086ce2008-01-28 15:55:01 -080087 unsigned long wb;
Chris Zankelc658eac2008-02-12 13:17:07 -080088
89 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
90 return -EIO;
91
Chris Zankel42086ce2008-01-28 15:55:01 -080092 __get_user(regs->pc, &gregset->pc);
93 __get_user(ps, &gregset->ps);
94 __get_user(regs->lbeg, &gregset->lbeg);
95 __get_user(regs->lend, &gregset->lend);
96 __get_user(regs->lcount, &gregset->lcount);
97 __get_user(regs->windowstart, &gregset->windowstart);
98 __get_user(wb, &gregset->windowbase);
Chris Zankelc658eac2008-02-12 13:17:07 -080099
100 regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
101
Chris Zankel42086ce2008-01-28 15:55:01 -0800102 if (wb >= XCHAL_NUM_AREGS / 4)
103 return -EFAULT;
Chris Zankelc658eac2008-02-12 13:17:07 -0800104
Chris Zankel42086ce2008-01-28 15:55:01 -0800105 regs->windowbase = wb;
106
107 if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
108 gregset->a, wb * 16))
109 return -EFAULT;
110
111 if (__copy_from_user(regs->areg, gregset->a + wb*4, (WSBITS-wb) * 16))
112 return -EFAULT;
113
114 return 0;
Chris Zankelc658eac2008-02-12 13:17:07 -0800115}
116
117
118int ptrace_getxregs(struct task_struct *child, void __user *uregs)
119{
120 struct pt_regs *regs = task_pt_regs(child);
121 struct thread_info *ti = task_thread_info(child);
122 elf_xtregs_t __user *xtregs = uregs;
123 int ret = 0;
124
125 if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
126 return -EIO;
127
128#if XTENSA_HAVE_COPROCESSORS
129 /* Flush all coprocessor registers to memory. */
130 coprocessor_flush_all(ti);
131 ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
132 sizeof(xtregs_coprocessor_t));
133#endif
134 ret |= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
135 sizeof(xtregs->opt));
136 ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
137 sizeof(xtregs->user));
138
139 return ret ? -EFAULT : 0;
140}
141
142int ptrace_setxregs(struct task_struct *child, void __user *uregs)
143{
144 struct thread_info *ti = task_thread_info(child);
145 struct pt_regs *regs = task_pt_regs(child);
146 elf_xtregs_t *xtregs = uregs;
147 int ret = 0;
148
Dan Rosenberg0d0138e2011-07-25 17:11:53 -0700149 if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
150 return -EFAULT;
151
Chris Zankelc658eac2008-02-12 13:17:07 -0800152#if XTENSA_HAVE_COPROCESSORS
153 /* Flush all coprocessors before we overwrite them. */
154 coprocessor_flush_all(ti);
155 coprocessor_release_all(ti);
156
157 ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
158 sizeof(xtregs_coprocessor_t));
159#endif
160 ret |= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
161 sizeof(xtregs->opt));
162 ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
163 sizeof(xtregs->user));
164
165 return ret ? -EFAULT : 0;
166}
167
168int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
169{
170 struct pt_regs *regs;
171 unsigned long tmp;
172
173 regs = task_pt_regs(child);
174 tmp = 0; /* Default return value. */
175
176 switch(regno) {
Chris Zankel5a0015d2005-06-23 22:01:16 -0700177
178 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
Chris Zankelc658eac2008-02-12 13:17:07 -0800179 tmp = regs->areg[regno - REG_AR_BASE];
Chris Zankel5a0015d2005-06-23 22:01:16 -0700180 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800181
Chris Zankel5a0015d2005-06-23 22:01:16 -0700182 case REG_A_BASE ... REG_A_BASE + 15:
Chris Zankelc658eac2008-02-12 13:17:07 -0800183 tmp = regs->areg[regno - REG_A_BASE];
Chris Zankel5a0015d2005-06-23 22:01:16 -0700184 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800185
Chris Zankel5a0015d2005-06-23 22:01:16 -0700186 case REG_PC:
187 tmp = regs->pc;
188 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800189
Chris Zankel5a0015d2005-06-23 22:01:16 -0700190 case REG_PS:
191 /* Note: PS.EXCM is not set while user task is running;
192 * its being set in regs is for exception handling
193 * convenience. */
Chris Zankel173d6682006-12-10 02:18:48 -0800194 tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
Chris Zankel5a0015d2005-06-23 22:01:16 -0700195 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800196
Chris Zankel5a0015d2005-06-23 22:01:16 -0700197 case REG_WB:
Chris Zankelc658eac2008-02-12 13:17:07 -0800198 break; /* tmp = 0 */
199
Chris Zankel5a0015d2005-06-23 22:01:16 -0700200 case REG_WS:
Chris Zankelc658eac2008-02-12 13:17:07 -0800201 {
202 unsigned long wb = regs->windowbase;
203 unsigned long ws = regs->windowstart;
204 tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700205 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800206 }
Chris Zankel5a0015d2005-06-23 22:01:16 -0700207 case REG_LBEG:
208 tmp = regs->lbeg;
209 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800210
Chris Zankel5a0015d2005-06-23 22:01:16 -0700211 case REG_LEND:
212 tmp = regs->lend;
213 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800214
Chris Zankel5a0015d2005-06-23 22:01:16 -0700215 case REG_LCOUNT:
216 tmp = regs->lcount;
217 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800218
Chris Zankel5a0015d2005-06-23 22:01:16 -0700219 case REG_SAR:
220 tmp = regs->sar;
221 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800222
Chris Zankel5a0015d2005-06-23 22:01:16 -0700223 case SYSCALL_NR:
224 tmp = regs->syscall;
225 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700226
Chris Zankelc658eac2008-02-12 13:17:07 -0800227 default:
228 return -EIO;
229 }
230 return put_user(tmp, ret);
231}
232
233int ptrace_pokeusr(struct task_struct *child, long regno, long val)
234{
235 struct pt_regs *regs;
236 regs = task_pt_regs(child);
237
238 switch (regno) {
239 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
240 regs->areg[regno - REG_AR_BASE] = val;
241 break;
242
243 case REG_A_BASE ... REG_A_BASE + 15:
244 regs->areg[regno - REG_A_BASE] = val;
245 break;
246
247 case REG_PC:
248 regs->pc = val;
249 break;
250
251 case SYSCALL_NR:
252 regs->syscall = val;
253 break;
254
255 default:
256 return -EIO;
257 }
258 return 0;
259}
260
Namhyung Kim9b05a692010-10-27 15:33:47 -0700261long arch_ptrace(struct task_struct *child, long request,
262 unsigned long addr, unsigned long data)
Chris Zankelc658eac2008-02-12 13:17:07 -0800263{
264 int ret = -EPERM;
Namhyung Kim5ef45072010-10-27 15:34:06 -0700265 void __user *datap = (void __user *) data;
Chris Zankelc658eac2008-02-12 13:17:07 -0800266
267 switch (request) {
268 case PTRACE_PEEKTEXT: /* read word at location addr. */
269 case PTRACE_PEEKDATA:
270 ret = generic_ptrace_peekdata(child, addr, data);
271 break;
272
273 case PTRACE_PEEKUSR: /* read register specified by addr. */
Namhyung Kim5ef45072010-10-27 15:34:06 -0700274 ret = ptrace_peekusr(child, addr, datap);
Chris Zankelc658eac2008-02-12 13:17:07 -0800275 break;
276
277 case PTRACE_POKETEXT: /* write the word at location addr. */
Chris Zankel5a0015d2005-06-23 22:01:16 -0700278 case PTRACE_POKEDATA:
Alexey Dobriyanf284ce72007-07-17 04:03:44 -0700279 ret = generic_ptrace_pokedata(child, addr, data);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700280 break;
Chris Zankelc658eac2008-02-12 13:17:07 -0800281
282 case PTRACE_POKEUSR: /* write register specified by addr. */
283 ret = ptrace_pokeusr(child, addr, data);
284 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700285
Chris Zankel5a0015d2005-06-23 22:01:16 -0700286 case PTRACE_GETREGS:
Namhyung Kim5ef45072010-10-27 15:34:06 -0700287 ret = ptrace_getregs(child, datap);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700288 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700289
290 case PTRACE_SETREGS:
Namhyung Kim5ef45072010-10-27 15:34:06 -0700291 ret = ptrace_setregs(child, datap);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700292 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700293
Chris Zankelc658eac2008-02-12 13:17:07 -0800294 case PTRACE_GETXTREGS:
Namhyung Kim5ef45072010-10-27 15:34:06 -0700295 ret = ptrace_getxregs(child, datap);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700296 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700297
Chris Zankelc658eac2008-02-12 13:17:07 -0800298 case PTRACE_SETXTREGS:
Namhyung Kim5ef45072010-10-27 15:34:06 -0700299 ret = ptrace_setxregs(child, datap);
Chris Zankel5a0015d2005-06-23 22:01:16 -0700300 break;
301
Chris Zankel5a0015d2005-06-23 22:01:16 -0700302 default:
303 ret = ptrace_request(child, request, addr, data);
Chris Zankelc658eac2008-02-12 13:17:07 -0800304 break;
Chris Zankel5a0015d2005-06-23 22:01:16 -0700305 }
Chris Zankelc658eac2008-02-12 13:17:07 -0800306
Chris Zankel5a0015d2005-06-23 22:01:16 -0700307 return ret;
308}
309
310void do_syscall_trace(void)
311{
Chris Zankel5a0015d2005-06-23 22:01:16 -0700312 /*
313 * The 0x80 provides a way for the tracing parent to distinguish
314 * between a syscall stop and SIGTRAP delivery
315 */
316 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
317
318 /*
319 * this isn't the same as continuing with a signal, but it will do
320 * for normal use. strace only continues with a signal if the
321 * stopping signal is not SIGTRAP. -brl
322 */
323 if (current->exit_code) {
324 send_sig(current->exit_code, current, 1);
325 current->exit_code = 0;
326 }
327}
Chris Zankelfc4fb2a2006-12-10 02:18:52 -0800328
329void do_syscall_trace_enter(struct pt_regs *regs)
330{
331 if (test_thread_flag(TIF_SYSCALL_TRACE)
332 && (current->ptrace & PT_PTRACED))
333 do_syscall_trace();
334
335#if 0
Eric Parisb05d8442012-01-03 14:23:06 -0500336 audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
Chris Zankelfc4fb2a2006-12-10 02:18:52 -0800337#endif
338}
339
340void do_syscall_trace_leave(struct pt_regs *regs)
341{
342 if ((test_thread_flag(TIF_SYSCALL_TRACE))
343 && (current->ptrace & PT_PTRACED))
344 do_syscall_trace();
345}
346