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/ptrace.h>
21 #include <linux/regset.h>
22 #include <linux/compat.h>
24 #include <asm/switch_to.h>
26 #include "ptrace-decl.h"
29 * does not yet catch signals sent when the child dies.
30 * in exit.c or in signal.c.
33 /* Macros to workout the correct index for the FPR in the thread struct */
34 #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
35 #define FPRHALF(i) (((i) - PT_FPR0) & 1)
36 #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
38 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
39 compat_ulong_t caddr
, compat_ulong_t cdata
)
41 unsigned long addr
= caddr
;
42 unsigned long data
= cdata
;
47 * Read 4 bytes of the other process' storage
48 * data is a pointer specifying where the user wants the
50 * addr is a pointer in the user's storage that contains an 8 byte
51 * address in the other process of the 4 bytes that is to be read
52 * (this is run in a 32-bit process looking at a 64-bit process)
53 * when I and D space are separate, these will need to be fixed.
55 case PPC_PTRACE_PEEKTEXT_3264
:
56 case PPC_PTRACE_PEEKDATA_3264
: {
59 u32 __user
* addrOthers
;
63 /* Get the addr in the other process that we want to read */
64 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
67 copied
= ptrace_access_vm(child
, (u64
)addrOthers
, &tmp
,
68 sizeof(tmp
), FOLL_FORCE
);
69 if (copied
!= sizeof(tmp
))
71 ret
= put_user(tmp
, (u32 __user
*)data
);
75 /* Read a register (specified by ADDR) out of the "user area" */
76 case PTRACE_PEEKUSR
: {
81 /* convert to index and check */
82 index
= (unsigned long) addr
>> 2;
83 if ((addr
& 3) || (index
> PT_FPSCR32
))
86 if (index
< PT_FPR0
) {
87 ret
= ptrace_get_reg(child
, index
, &tmp
);
91 flush_fp_to_thread(child
);
93 * the user space code considers the floating point
94 * to be an array of unsigned int (32 bits) - the
95 * index passed in is based on this assumption.
97 tmp
= ((unsigned int *)child
->thread
.fp_state
.fpr
)
100 ret
= put_user((unsigned int)tmp
, (u32 __user
*)data
);
105 * Read 4 bytes out of the other process' pt_regs area
106 * data is a pointer specifying where the user wants the
107 * 4 bytes copied into
108 * addr is the offset into the other process' pt_regs structure
110 * (this is run in a 32-bit process looking at a 64-bit process)
112 case PPC_PTRACE_PEEKUSR_3264
: {
120 /* Determine which register the user wants */
121 index
= (u64
)addr
>> 2;
123 /* Determine which part of the register the user wants */
125 part
= 1; /* want the 2nd half of the register (right-most). */
127 part
= 0; /* want the 1st half of the register (left-most). */
129 /* Validate the input - check to see if address is on the wrong boundary
130 * or beyond the end of the user area
132 if ((addr
& 3) || numReg
> PT_FPSCR
)
135 if (numReg
>= PT_FPR0
) {
136 flush_fp_to_thread(child
);
138 tmp
= child
->thread
.fp_state
.fpr
[numReg
- PT_FPR0
][0];
139 } else { /* register within PT_REGS struct */
141 ret
= ptrace_get_reg(child
, numReg
, &tmp2
);
146 reg32bits
= ((u32
*)&tmp
)[part
];
147 ret
= put_user(reg32bits
, (u32 __user
*)data
);
152 * Write 4 bytes into the other process' storage
153 * data is the 4 bytes that the user wants written
154 * addr is a pointer in the user's storage that contains an
155 * 8 byte address in the other process where the 4 bytes
156 * that is to be written
157 * (this is run in a 32-bit process looking at a 64-bit process)
158 * when I and D space are separate, these will need to be fixed.
160 case PPC_PTRACE_POKETEXT_3264
:
161 case PPC_PTRACE_POKEDATA_3264
: {
163 u32 __user
* addrOthers
;
165 /* Get the addr in the other process that we want to write into */
167 if (get_user(addrOthers
, (u32 __user
* __user
*)addr
) != 0)
170 if (ptrace_access_vm(child
, (u64
)addrOthers
, &tmp
,
172 FOLL_FORCE
| FOLL_WRITE
) == sizeof(tmp
))
178 /* write the word at location addr in the USER area */
179 case PTRACE_POKEUSR
: {
183 /* convert to index and check */
184 index
= (unsigned long) addr
>> 2;
185 if ((addr
& 3) || (index
> PT_FPSCR32
))
188 if (index
< PT_FPR0
) {
189 ret
= ptrace_put_reg(child
, index
, data
);
191 flush_fp_to_thread(child
);
193 * the user space code considers the floating point
194 * to be an array of unsigned int (32 bits) - the
195 * index passed in is based on this assumption.
197 ((unsigned int *)child
->thread
.fp_state
.fpr
)
198 [FPRINDEX(index
)] = data
;
205 * Write 4 bytes into the other process' pt_regs area
206 * data is the 4 bytes that the user wants written
207 * addr is the offset into the other process' pt_regs structure
208 * that is to be written into
209 * (this is run in a 32-bit process looking at a 64-bit process)
211 case PPC_PTRACE_POKEUSR_3264
: {
216 /* Determine which register the user wants */
217 index
= (u64
)addr
>> 2;
221 * Validate the input - check to see if address is on the
222 * wrong boundary or beyond the end of the user area
224 if ((addr
& 3) || (numReg
> PT_FPSCR
))
226 if (numReg
< PT_FPR0
) {
228 ret
= ptrace_get_reg(child
, numReg
, &freg
);
232 freg
= (freg
& ~0xfffffffful
) | (data
& 0xfffffffful
);
234 freg
= (freg
& 0xfffffffful
) | (data
<< 32);
235 ret
= ptrace_put_reg(child
, numReg
, freg
);
238 flush_fp_to_thread(child
);
239 /* get 64 bit FPR ... */
240 tmp
= &child
->thread
.fp_state
.fpr
[numReg
- PT_FPR0
][0];
241 /* ... write the 32 bit part we want */
242 ((u32
*)tmp
)[index
% 2] = data
;
248 case PTRACE_GET_DEBUGREG
: {
249 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
250 unsigned long dabr_fake
;
253 /* We only support one DABR and no IABRS at the moment */
256 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
257 ret
= put_user(child
->thread
.debug
.dac1
, (u32 __user
*)data
);
260 (child
->thread
.hw_brk
[0].address
& (~HW_BRK_TYPE_DABR
)) |
261 (child
->thread
.hw_brk
[0].type
& HW_BRK_TYPE_DABR
));
262 ret
= put_user(dabr_fake
, (u32 __user
*)data
);
267 case PTRACE_GETREGS
: /* Get all pt_regs from the child. */
268 return copy_regset_to_user(
269 child
, task_user_regset_view(current
), 0,
270 0, PT_REGS_COUNT
* sizeof(compat_long_t
),
273 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
274 return copy_regset_from_user(
275 child
, task_user_regset_view(current
), 0,
276 0, PT_REGS_COUNT
* sizeof(compat_long_t
),
279 case PTRACE_GETFPREGS
:
280 case PTRACE_SETFPREGS
:
281 case PTRACE_GETVRREGS
:
282 case PTRACE_SETVRREGS
:
283 case PTRACE_GETVSRREGS
:
284 case PTRACE_SETVSRREGS
:
285 case PTRACE_GETREGS64
:
286 case PTRACE_SETREGS64
:
288 case PTRACE_SINGLESTEP
:
290 case PTRACE_SET_DEBUGREG
:
293 case PPC_PTRACE_GETHWDBGINFO
:
294 case PPC_PTRACE_SETHWDEBUG
:
295 case PPC_PTRACE_DELHWDEBUG
:
296 ret
= arch_ptrace(child
, request
, addr
, data
);
300 ret
= compat_ptrace_request(child
, request
, addr
, data
);