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/uaccess.h>
28 #include <asm/ptrace.h>
30 #include <asm/coprocessor.h>
33 void user_enable_single_step(struct task_struct *child)
35 child->ptrace |= PT_SINGLESTEP;
38 void user_disable_single_step(struct task_struct *child)
40 child->ptrace &= ~PT_SINGLESTEP;
44 * Called by kernel/ptrace.c when detaching to disable single stepping.
47 void ptrace_disable(struct task_struct *child)
52 int ptrace_getregs(struct task_struct *child, void __user *uregs)
54 struct pt_regs *regs = task_pt_regs(child);
55 xtensa_gregset_t __user *gregset = uregs;
56 unsigned long wm = regs->wmask;
57 unsigned long wb = regs->windowbase;
60 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
63 __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);
71 live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
73 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));
81 int ptrace_setregs(struct task_struct *child, void __user *uregs)
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;
89 if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
92 __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);
100 regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);
102 if (wb >= XCHAL_NUM_AREGS / 4)
105 regs->windowbase = wb;
107 if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
108 gregset->a, wb * 16))
111 if (__copy_from_user(regs->areg, gregset->a + wb*4, (WSBITS-wb) * 16))
118 int ptrace_getxregs(struct task_struct *child, void __user *uregs)
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;
125 if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
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));
134 ret |= __copy_to_user(&xtregs->opt, ®s->xtregs_opt,
135 sizeof(xtregs->opt));
136 ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
137 sizeof(xtregs->user));
139 return ret ? -EFAULT : 0;
142 int ptrace_setxregs(struct task_struct *child, void __user *uregs)
144 struct thread_info *ti = task_thread_info(child);
145 struct pt_regs *regs = task_pt_regs(child);
146 elf_xtregs_t *xtregs = uregs;
149 if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
152 #if XTENSA_HAVE_COPROCESSORS
153 /* Flush all coprocessors before we overwrite them. */
154 coprocessor_flush_all(ti);
155 coprocessor_release_all(ti);
157 ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
158 sizeof(xtregs_coprocessor_t));
160 ret |= __copy_from_user(®s->xtregs_opt, &xtregs->opt,
161 sizeof(xtregs->opt));
162 ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
163 sizeof(xtregs->user));
165 return ret ? -EFAULT : 0;
168 int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
170 struct pt_regs *regs;
173 regs = task_pt_regs(child);
174 tmp = 0; /* Default return value. */
178 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
179 tmp = regs->areg[regno - REG_AR_BASE];
182 case REG_A_BASE ... REG_A_BASE + 15:
183 tmp = regs->areg[regno - REG_A_BASE];
191 /* Note: PS.EXCM is not set while user task is running;
192 * its being set in regs is for exception handling
194 tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
202 unsigned long wb = regs->windowbase;
203 unsigned long ws = regs->windowstart;
204 tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
230 return put_user(tmp, ret);
233 int ptrace_pokeusr(struct task_struct *child, long regno, long val)
235 struct pt_regs *regs;
236 regs = task_pt_regs(child);
239 case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
240 regs->areg[regno - REG_AR_BASE] = val;
243 case REG_A_BASE ... REG_A_BASE + 15:
244 regs->areg[regno - REG_A_BASE] = val;
261 long arch_ptrace(struct task_struct *child, long request,
262 unsigned long addr, unsigned long data)
265 void __user *datap = (void __user *) data;
268 case PTRACE_PEEKTEXT: /* read word at location addr. */
269 case PTRACE_PEEKDATA:
270 ret = generic_ptrace_peekdata(child, addr, data);
273 case PTRACE_PEEKUSR: /* read register specified by addr. */
274 ret = ptrace_peekusr(child, addr, datap);
277 case PTRACE_POKETEXT: /* write the word at location addr. */
278 case PTRACE_POKEDATA:
279 ret = generic_ptrace_pokedata(child, addr, data);
282 case PTRACE_POKEUSR: /* write register specified by addr. */
283 ret = ptrace_pokeusr(child, addr, data);
287 ret = ptrace_getregs(child, datap);
291 ret = ptrace_setregs(child, datap);
294 case PTRACE_GETXTREGS:
295 ret = ptrace_getxregs(child, datap);
298 case PTRACE_SETXTREGS:
299 ret = ptrace_setxregs(child, datap);
303 ret = ptrace_request(child, request, addr, data);
310 void do_syscall_trace(void)
313 * The 0x80 provides a way for the tracing parent to distinguish
314 * between a syscall stop and SIGTRAP delivery
316 ptrace_notify(SIGTRAP|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
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
323 if (current->exit_code) {
324 send_sig(current->exit_code, current, 1);
325 current->exit_code = 0;
329 void do_syscall_trace_enter(struct pt_regs *regs)
331 if (test_thread_flag(TIF_SYSCALL_TRACE)
332 && (current->ptrace & PT_PTRACED))
336 audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
340 void do_syscall_trace_leave(struct pt_regs *regs)
342 if ((test_thread_flag(TIF_SYSCALL_TRACE))
343 && (current->ptrace & PT_PTRACED))