2 * ptrace for 32-bit processes running on a 64-bit kernel.
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Derived from "arch/m68k/kernel/ptrace.c"
8 * Copyright (C) 1994 by Hamish Macdonald
9 * Taken from linux/kernel/ptrace.c and modified for M680x0.
10 * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
12 * Modified by Cort Dougan (cort@hq.fsmlabs.com)
13 * and Paul Mackerras (paulus@samba.org).
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file COPYING in the main directory of
17 * this archive for more details.
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
23 #include <linux/smp.h>
24 #include <linux/smp_lock.h>
25 #include <linux/errno.h>
26 #include <linux/ptrace.h>
27 #include <linux/regset.h>
28 #include <linux/user.h>
29 #include <linux/security.h>
30 #include <linux/signal.h>
31 #include <linux/compat.h>
33 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
36 #include <asm/system.h>
39 * does not yet catch signals sent when the child dies.
40 * in exit.c or in signal.c.
44 * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
45 * we mark them as obsolete now, they will be removed in a future version
47 static long compat_ptrace_old(struct task_struct *child, long request,
51 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
52 return copy_regset_to_user(child,
53 task_user_regset_view(current), 0,
54 0, 32 * sizeof(compat_long_t),
57 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
58 return copy_regset_from_user(child,
59 task_user_regset_view(current), 0,
60 0, 32 * sizeof(compat_long_t),
67 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
68 compat_ulong_t caddr, compat_ulong_t cdata)
70 unsigned long addr = caddr;
71 unsigned long data = cdata;
76 * Read 4 bytes of the other process' storage
77 * data is a pointer specifying where the user wants the
79 * addr is a pointer in the user's storage that contains an 8 byte
80 * address in the other process of the 4 bytes that is to be read
81 * (this is run in a 32-bit process looking at a 64-bit process)
82 * when I and D space are separate, these will need to be fixed.
84 case PPC_PTRACE_PEEKTEXT_3264:
85 case PPC_PTRACE_PEEKDATA_3264: {
88 u32 __user * addrOthers;
92 /* Get the addr in the other process that we want to read */
93 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
96 copied = access_process_vm(child, (u64)addrOthers, &tmp,
98 if (copied != sizeof(tmp))
100 ret = put_user(tmp, (u32 __user *)data);
104 /* Read a register (specified by ADDR) out of the "user area" */
105 case PTRACE_PEEKUSR: {
110 /* convert to index and check */
111 index = (unsigned long) addr >> 2;
112 if ((addr & 3) || (index > PT_FPSCR32))
115 CHECK_FULL_REGS(child->thread.regs);
116 if (index < PT_FPR0) {
117 tmp = ptrace_get_reg(child, index);
119 flush_fp_to_thread(child);
121 * the user space code considers the floating point
122 * to be an array of unsigned int (32 bits) - the
123 * index passed in is based on this assumption.
125 tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0];
127 ret = put_user((unsigned int)tmp, (u32 __user *)data);
132 * Read 4 bytes out of the other process' pt_regs area
133 * data is a pointer specifying where the user wants the
134 * 4 bytes copied into
135 * addr is the offset into the other process' pt_regs structure
137 * (this is run in a 32-bit process looking at a 64-bit process)
139 case PPC_PTRACE_PEEKUSR_3264: {
147 /* Determine which register the user wants */
148 index = (u64)addr >> 2;
150 /* Determine which part of the register the user wants */
152 part = 1; /* want the 2nd half of the register (right-most). */
154 part = 0; /* want the 1st half of the register (left-most). */
156 /* Validate the input - check to see if address is on the wrong boundary
157 * or beyond the end of the user area
159 if ((addr & 3) || numReg > PT_FPSCR)
162 CHECK_FULL_REGS(child->thread.regs);
163 if (numReg >= PT_FPR0) {
164 flush_fp_to_thread(child);
165 tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
166 } else { /* register within PT_REGS struct */
167 tmp = ptrace_get_reg(child, numReg);
169 reg32bits = ((u32*)&tmp)[part];
170 ret = put_user(reg32bits, (u32 __user *)data);
175 * Write 4 bytes into the other process' storage
176 * data is the 4 bytes that the user wants written
177 * addr is a pointer in the user's storage that contains an
178 * 8 byte address in the other process where the 4 bytes
179 * that is to be written
180 * (this is run in a 32-bit process looking at a 64-bit process)
181 * when I and D space are separate, these will need to be fixed.
183 case PPC_PTRACE_POKETEXT_3264:
184 case PPC_PTRACE_POKEDATA_3264: {
186 u32 __user * addrOthers;
188 /* Get the addr in the other process that we want to write into */
190 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
193 if (access_process_vm(child, (u64)addrOthers, &tmp,
194 sizeof(tmp), 1) == sizeof(tmp))
200 /* write the word at location addr in the USER area */
201 case PTRACE_POKEUSR: {
205 /* convert to index and check */
206 index = (unsigned long) addr >> 2;
207 if ((addr & 3) || (index > PT_FPSCR32))
210 CHECK_FULL_REGS(child->thread.regs);
211 if (index < PT_FPR0) {
212 ret = ptrace_put_reg(child, index, data);
214 flush_fp_to_thread(child);
216 * the user space code considers the floating point
217 * to be an array of unsigned int (32 bits) - the
218 * index passed in is based on this assumption.
220 ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data;
227 * Write 4 bytes into the other process' pt_regs area
228 * data is the 4 bytes that the user wants written
229 * addr is the offset into the other process' pt_regs structure
230 * that is to be written into
231 * (this is run in a 32-bit process looking at a 64-bit process)
233 case PPC_PTRACE_POKEUSR_3264: {
238 /* Determine which register the user wants */
239 index = (u64)addr >> 2;
243 * Validate the input - check to see if address is on the
244 * wrong boundary or beyond the end of the user area
246 if ((addr & 3) || (numReg > PT_FPSCR))
248 CHECK_FULL_REGS(child->thread.regs);
249 if (numReg < PT_FPR0) {
250 unsigned long freg = ptrace_get_reg(child, numReg);
252 freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
254 freg = (freg & 0xfffffffful) | (data << 32);
255 ret = ptrace_put_reg(child, numReg, freg);
257 flush_fp_to_thread(child);
258 ((unsigned int *)child->thread.regs)[index] = data;
264 case PTRACE_GET_DEBUGREG: {
266 /* We only support one DABR and no IABRS at the moment */
269 ret = put_user(child->thread.dabr, (u32 __user *)data);
273 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
274 return copy_regset_to_user(
275 child, task_user_regset_view(current), 0,
276 0, PT_REGS_COUNT * sizeof(compat_long_t),
279 case PTRACE_SETREGS: /* Set all gp regs in the child. */
280 return copy_regset_from_user(
281 child, task_user_regset_view(current), 0,
282 0, PT_REGS_COUNT * sizeof(compat_long_t),
285 case PTRACE_GETFPREGS:
286 case PTRACE_SETFPREGS:
287 case PTRACE_GETVRREGS:
288 case PTRACE_SETVRREGS:
289 case PTRACE_GETREGS64:
290 case PTRACE_SETREGS64:
291 case PPC_PTRACE_GETFPREGS:
292 case PPC_PTRACE_SETFPREGS:
294 case PTRACE_SINGLESTEP:
296 case PTRACE_SET_DEBUGREG:
299 ret = arch_ptrace(child, request, addr, data);
302 /* Old reverse args ptrace callss */
303 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
304 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
305 ret = compat_ptrace_old(child, request, addr, data);
309 ret = compat_ptrace_request(child, request, addr, data);