1 // TODO some minor issues
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
7 * Copyright (C) 2001 - 2007 Tensilica Inc.
9 * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
10 * Chris Zankel <chris@zankel.net>
11 * Scott Foehner<sfoehner@yahoo.com>,
13 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
19 #include <linux/errno.h>
20 #include <linux/ptrace.h>
21 #include <linux/smp.h>
22 #include <linux/security.h>
23 #include <linux/signal.h>
25 #include <asm/pgtable.h>
27 #include <asm/system.h>
28 #include <asm/uaccess.h>
29 #include <asm/ptrace.h>
31 #include <asm/coprocessor.h>
34 void user_enable_single_step(struct task_struct *child)
36 child->ptrace |= PT_SINGLESTEP;
39 void user_disable_single_step(struct task_struct *child)
41 child->ptrace &= ~PT_SINGLESTEP;
45 * Called by kernel/ptrace.c when detaching to disable single stepping.
48 void ptrace_disable(struct task_struct *child)
53 int ptrace_getregs(struct task_struct *child, void __user *uregs)
55 struct pt_regs *regs = task_pt_regs(child);
56 xtensa_gregset_t __user *gregset = uregs;
57 unsigned long wm = regs->wmask;
58 unsigned long wb = regs->windowbase;
61 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
64 __put_user(regs->pc, &gregset->pc);
65 __put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
66 __put_user(regs->lbeg, &gregset->lbeg);
67 __put_user(regs->lend, &gregset->lend);
68 __put_user(regs->lcount, &gregset->lcount);
69 __put_user(regs->windowstart, &gregset->windowstart);
70 __put_user(regs->windowbase, &gregset->windowbase);
72 live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
74 for (i = 0; i < live; i++)
75 __put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
76 for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
77 __put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
82 int ptrace_setregs(struct task_struct *child, void __user *uregs)
84 struct pt_regs *regs = task_pt_regs(child);
85 xtensa_gregset_t *gregset = uregs;
86 const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
90 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
93 __get_user(regs->pc, &gregset->pc);
94 __get_user(ps, &gregset->ps);
95 __get_user(regs->lbeg, &gregset->lbeg);
96 __get_user(regs->lend, &gregset->lend);
97 __get_user(regs->lcount, &gregset->lcount);
98 __get_user(regs->windowstart, &gregset->windowstart);
99 __get_user(wb, &gregset->windowbase);
101 regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
103 if (wb >= XCHAL_NUM_AREGS / 4)
106 regs->windowbase = wb;
108 if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
109 gregset->a, wb * 16))
112 if (__copy_from_user(regs->areg, gregset->a + wb*4, (WSBITS-wb) * 16))
119 int ptrace_getxregs(struct task_struct *child, void __user *uregs)
121 struct pt_regs *regs = task_pt_regs(child);
122 struct thread_info *ti = task_thread_info(child);
123 elf_xtregs_t __user *xtregs = uregs;
126 if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
129 #if XTENSA_HAVE_COPROCESSORS
130 /* Flush all coprocessor registers to memory. */
131 coprocessor_flush_all(ti);
132 ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
133 sizeof(xtregs_coprocessor_t));
135 ret |= __copy_to_user(&xtregs->opt, ®s->xtregs_opt,
136 sizeof(xtregs->opt));
137 ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
138 sizeof(xtregs->user));
140 return ret ? -EFAULT : 0;
143 int ptrace_setxregs(struct task_struct *child, void __user *uregs)
145 struct thread_info *ti = task_thread_info(child);
146 struct pt_regs *regs = task_pt_regs(child);
147 elf_xtregs_t *xtregs = uregs;
150 #if XTENSA_HAVE_COPROCESSORS
151 /* Flush all coprocessors before we overwrite them. */
152 coprocessor_flush_all(ti);
153 coprocessor_release_all(ti);
155 ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
156 sizeof(xtregs_coprocessor_t));
158 ret |= __copy_from_user(®s->xtregs_opt, &xtregs->opt,
159 sizeof(xtregs->opt));
160 ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
161 sizeof(xtregs->user));
163 return ret ? -EFAULT : 0;
166 int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
168 struct pt_regs *regs;
171 regs = task_pt_regs(child);
172 tmp = 0; /* Default return value. */
176 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
177 tmp = regs->areg[regno - REG_AR_BASE];
180 case REG_A_BASE ... REG_A_BASE + 15:
181 tmp = regs->areg[regno - REG_A_BASE];
189 /* Note: PS.EXCM is not set while user task is running;
190 * its being set in regs is for exception handling
192 tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
200 unsigned long wb = regs->windowbase;
201 unsigned long ws = regs->windowstart;
202 tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
228 return put_user(tmp, ret);
231 int ptrace_pokeusr(struct task_struct *child, long regno, long val)
233 struct pt_regs *regs;
234 regs = task_pt_regs(child);
237 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
238 regs->areg[regno - REG_AR_BASE] = val;
241 case REG_A_BASE ... REG_A_BASE + 15:
242 regs->areg[regno - REG_A_BASE] = val;
259 long arch_ptrace(struct task_struct *child, long request,
260 unsigned long addr, unsigned long data)
265 case PTRACE_PEEKTEXT: /* read word at location addr. */
266 case PTRACE_PEEKDATA:
267 ret = generic_ptrace_peekdata(child, addr, data);
270 case PTRACE_PEEKUSR: /* read register specified by addr. */
271 ret = ptrace_peekusr(child, addr, (void __user *) data);
274 case PTRACE_POKETEXT: /* write the word at location addr. */
275 case PTRACE_POKEDATA:
276 ret = generic_ptrace_pokedata(child, addr, data);
279 case PTRACE_POKEUSR: /* write register specified by addr. */
280 ret = ptrace_pokeusr(child, addr, data);
284 ret = ptrace_getregs(child, (void __user *) data);
288 ret = ptrace_setregs(child, (void __user *) data);
291 case PTRACE_GETXTREGS:
292 ret = ptrace_getxregs(child, (void __user *) data);
295 case PTRACE_SETXTREGS:
296 ret = ptrace_setxregs(child, (void __user *) data);
300 ret = ptrace_request(child, request, addr, data);
307 void do_syscall_trace(void)
310 * The 0x80 provides a way for the tracing parent to distinguish
311 * between a syscall stop and SIGTRAP delivery
313 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
316 * this isn't the same as continuing with a signal, but it will do
317 * for normal use. strace only continues with a signal if the
318 * stopping signal is not SIGTRAP. -brl
320 if (current->exit_code) {
321 send_sig(current->exit_code, current, 1);
322 current->exit_code = 0;
326 void do_syscall_trace_enter(struct pt_regs *regs)
328 if (test_thread_flag(TIF_SYSCALL_TRACE)
329 && (current->ptrace & PT_PTRACED))
333 if (unlikely(current->audit_context))
334 audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
338 void do_syscall_trace_leave(struct pt_regs *regs)
340 if ((test_thread_flag(TIF_SYSCALL_TRACE))
341 && (current->ptrace & PT_PTRACED))