mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 01:54:09 +08:00
bb2c458b8b
Update compat_arch_ptrace to follow recent changes in
PTRACE_GET_DEBUGREG and the addition of
PPC_PTRACE_{GETHWDBGINFO|{SET|DEL}HWDEBUG}. The latter three can be
forwarded to arch_ptrace unchanged.
Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
338 lines
9.1 KiB
C
338 lines
9.1 KiB
C
/*
|
|
* ptrace for 32-bit processes running on a 64-bit kernel.
|
|
*
|
|
* PowerPC version
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Derived from "arch/m68k/kernel/ptrace.c"
|
|
* Copyright (C) 1994 by Hamish Macdonald
|
|
* Taken from linux/kernel/ptrace.c and modified for M680x0.
|
|
* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds
|
|
*
|
|
* Modified by Cort Dougan (cort@hq.fsmlabs.com)
|
|
* and Paul Mackerras (paulus@samba.org).
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file COPYING in the main directory of
|
|
* this archive for more details.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/regset.h>
|
|
#include <linux/user.h>
|
|
#include <linux/security.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/compat.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
|
|
/*
|
|
* does not yet catch signals sent when the child dies.
|
|
* in exit.c or in signal.c.
|
|
*/
|
|
|
|
/*
|
|
* Here are the old "legacy" powerpc specific getregs/setregs ptrace calls,
|
|
* we mark them as obsolete now, they will be removed in a future version
|
|
*/
|
|
static long compat_ptrace_old(struct task_struct *child, long request,
|
|
long addr, long data)
|
|
{
|
|
switch (request) {
|
|
case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
|
|
return copy_regset_to_user(child,
|
|
task_user_regset_view(current), 0,
|
|
0, 32 * sizeof(compat_long_t),
|
|
compat_ptr(data));
|
|
|
|
case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
|
|
return copy_regset_from_user(child,
|
|
task_user_regset_view(current), 0,
|
|
0, 32 * sizeof(compat_long_t),
|
|
compat_ptr(data));
|
|
}
|
|
|
|
return -EPERM;
|
|
}
|
|
|
|
/* Macros to workout the correct index for the FPR in the thread struct */
|
|
#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
|
|
#define FPRHALF(i) (((i) - PT_FPR0) & 1)
|
|
#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
|
|
#define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0))
|
|
|
|
long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
|
|
compat_ulong_t caddr, compat_ulong_t cdata)
|
|
{
|
|
unsigned long addr = caddr;
|
|
unsigned long data = cdata;
|
|
int ret;
|
|
|
|
switch (request) {
|
|
/*
|
|
* Read 4 bytes of the other process' storage
|
|
* data is a pointer specifying where the user wants the
|
|
* 4 bytes copied into
|
|
* addr is a pointer in the user's storage that contains an 8 byte
|
|
* address in the other process of the 4 bytes that is to be read
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
* when I and D space are separate, these will need to be fixed.
|
|
*/
|
|
case PPC_PTRACE_PEEKTEXT_3264:
|
|
case PPC_PTRACE_PEEKDATA_3264: {
|
|
u32 tmp;
|
|
int copied;
|
|
u32 __user * addrOthers;
|
|
|
|
ret = -EIO;
|
|
|
|
/* Get the addr in the other process that we want to read */
|
|
if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
|
|
break;
|
|
|
|
copied = access_process_vm(child, (u64)addrOthers, &tmp,
|
|
sizeof(tmp), 0);
|
|
if (copied != sizeof(tmp))
|
|
break;
|
|
ret = put_user(tmp, (u32 __user *)data);
|
|
break;
|
|
}
|
|
|
|
/* Read a register (specified by ADDR) out of the "user area" */
|
|
case PTRACE_PEEKUSR: {
|
|
int index;
|
|
unsigned long tmp;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
index = (unsigned long) addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR32))
|
|
break;
|
|
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (index < PT_FPR0) {
|
|
tmp = ptrace_get_reg(child, index);
|
|
} else {
|
|
flush_fp_to_thread(child);
|
|
/*
|
|
* the user space code considers the floating point
|
|
* to be an array of unsigned int (32 bits) - the
|
|
* index passed in is based on this assumption.
|
|
*/
|
|
tmp = ((unsigned int *)child->thread.fpr)
|
|
[FPRINDEX(index)];
|
|
}
|
|
ret = put_user((unsigned int)tmp, (u32 __user *)data);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Read 4 bytes out of the other process' pt_regs area
|
|
* data is a pointer specifying where the user wants the
|
|
* 4 bytes copied into
|
|
* addr is the offset into the other process' pt_regs structure
|
|
* that is to be read
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
*/
|
|
case PPC_PTRACE_PEEKUSR_3264: {
|
|
u32 index;
|
|
u32 reg32bits;
|
|
u64 tmp;
|
|
u32 numReg;
|
|
u32 part;
|
|
|
|
ret = -EIO;
|
|
/* Determine which register the user wants */
|
|
index = (u64)addr >> 2;
|
|
numReg = index / 2;
|
|
/* Determine which part of the register the user wants */
|
|
if (index % 2)
|
|
part = 1; /* want the 2nd half of the register (right-most). */
|
|
else
|
|
part = 0; /* want the 1st half of the register (left-most). */
|
|
|
|
/* Validate the input - check to see if address is on the wrong boundary
|
|
* or beyond the end of the user area
|
|
*/
|
|
if ((addr & 3) || numReg > PT_FPSCR)
|
|
break;
|
|
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (numReg >= PT_FPR0) {
|
|
flush_fp_to_thread(child);
|
|
/* get 64 bit FPR */
|
|
tmp = ((u64 *)child->thread.fpr)
|
|
[FPRINDEX_3264(numReg)];
|
|
} else { /* register within PT_REGS struct */
|
|
tmp = ptrace_get_reg(child, numReg);
|
|
}
|
|
reg32bits = ((u32*)&tmp)[part];
|
|
ret = put_user(reg32bits, (u32 __user *)data);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Write 4 bytes into the other process' storage
|
|
* data is the 4 bytes that the user wants written
|
|
* addr is a pointer in the user's storage that contains an
|
|
* 8 byte address in the other process where the 4 bytes
|
|
* that is to be written
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
* when I and D space are separate, these will need to be fixed.
|
|
*/
|
|
case PPC_PTRACE_POKETEXT_3264:
|
|
case PPC_PTRACE_POKEDATA_3264: {
|
|
u32 tmp = data;
|
|
u32 __user * addrOthers;
|
|
|
|
/* Get the addr in the other process that we want to write into */
|
|
ret = -EIO;
|
|
if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
|
|
break;
|
|
ret = 0;
|
|
if (access_process_vm(child, (u64)addrOthers, &tmp,
|
|
sizeof(tmp), 1) == sizeof(tmp))
|
|
break;
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
/* write the word at location addr in the USER area */
|
|
case PTRACE_POKEUSR: {
|
|
unsigned long index;
|
|
|
|
ret = -EIO;
|
|
/* convert to index and check */
|
|
index = (unsigned long) addr >> 2;
|
|
if ((addr & 3) || (index > PT_FPSCR32))
|
|
break;
|
|
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (index < PT_FPR0) {
|
|
ret = ptrace_put_reg(child, index, data);
|
|
} else {
|
|
flush_fp_to_thread(child);
|
|
/*
|
|
* the user space code considers the floating point
|
|
* to be an array of unsigned int (32 bits) - the
|
|
* index passed in is based on this assumption.
|
|
*/
|
|
((unsigned int *)child->thread.fpr)
|
|
[FPRINDEX(index)] = data;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Write 4 bytes into the other process' pt_regs area
|
|
* data is the 4 bytes that the user wants written
|
|
* addr is the offset into the other process' pt_regs structure
|
|
* that is to be written into
|
|
* (this is run in a 32-bit process looking at a 64-bit process)
|
|
*/
|
|
case PPC_PTRACE_POKEUSR_3264: {
|
|
u32 index;
|
|
u32 numReg;
|
|
|
|
ret = -EIO;
|
|
/* Determine which register the user wants */
|
|
index = (u64)addr >> 2;
|
|
numReg = index / 2;
|
|
|
|
/*
|
|
* Validate the input - check to see if address is on the
|
|
* wrong boundary or beyond the end of the user area
|
|
*/
|
|
if ((addr & 3) || (numReg > PT_FPSCR))
|
|
break;
|
|
CHECK_FULL_REGS(child->thread.regs);
|
|
if (numReg < PT_FPR0) {
|
|
unsigned long freg = ptrace_get_reg(child, numReg);
|
|
if (index % 2)
|
|
freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
|
|
else
|
|
freg = (freg & 0xfffffffful) | (data << 32);
|
|
ret = ptrace_put_reg(child, numReg, freg);
|
|
} else {
|
|
u64 *tmp;
|
|
flush_fp_to_thread(child);
|
|
/* get 64 bit FPR ... */
|
|
tmp = &(((u64 *)child->thread.fpr)
|
|
[FPRINDEX_3264(numReg)]);
|
|
/* ... write the 32 bit part we want */
|
|
((u32 *)tmp)[index % 2] = data;
|
|
ret = 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GET_DEBUGREG: {
|
|
ret = -EINVAL;
|
|
/* We only support one DABR and no IABRS at the moment */
|
|
if (addr > 0)
|
|
break;
|
|
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
|
|
ret = put_user(child->thread.dac1, (u32 __user *)data);
|
|
#else
|
|
ret = put_user(child->thread.dabr, (u32 __user *)data);
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETREGS: /* Get all pt_regs from the child. */
|
|
return copy_regset_to_user(
|
|
child, task_user_regset_view(current), 0,
|
|
0, PT_REGS_COUNT * sizeof(compat_long_t),
|
|
compat_ptr(data));
|
|
|
|
case PTRACE_SETREGS: /* Set all gp regs in the child. */
|
|
return copy_regset_from_user(
|
|
child, task_user_regset_view(current), 0,
|
|
0, PT_REGS_COUNT * sizeof(compat_long_t),
|
|
compat_ptr(data));
|
|
|
|
case PTRACE_GETFPREGS:
|
|
case PTRACE_SETFPREGS:
|
|
case PTRACE_GETVRREGS:
|
|
case PTRACE_SETVRREGS:
|
|
case PTRACE_GETVSRREGS:
|
|
case PTRACE_SETVSRREGS:
|
|
case PTRACE_GETREGS64:
|
|
case PTRACE_SETREGS64:
|
|
case PPC_PTRACE_GETFPREGS:
|
|
case PPC_PTRACE_SETFPREGS:
|
|
case PTRACE_KILL:
|
|
case PTRACE_SINGLESTEP:
|
|
case PTRACE_DETACH:
|
|
case PTRACE_SET_DEBUGREG:
|
|
case PTRACE_SYSCALL:
|
|
case PTRACE_CONT:
|
|
case PPC_PTRACE_GETHWDBGINFO:
|
|
case PPC_PTRACE_SETHWDEBUG:
|
|
case PPC_PTRACE_DELHWDEBUG:
|
|
ret = arch_ptrace(child, request, addr, data);
|
|
break;
|
|
|
|
/* Old reverse args ptrace callss */
|
|
case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
|
|
case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
|
|
ret = compat_ptrace_old(child, request, addr, data);
|
|
break;
|
|
|
|
default:
|
|
ret = compat_ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|