mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 01:22:07 +00:00
c49b6ecf08
Commit 0ea820cf introduced the PTRACE_GETFPREGS/SETFPREGS cmds,
but gdb-server still accesses the FPU state using the
PTRACE_PEEKUSR/POKEUSR commands. In this case, xstate was not
initialised.
Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: stable@kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
597 lines
14 KiB
C
597 lines
14 KiB
C
/*
|
|
* arch/sh/kernel/ptrace_64.c
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
* Copyright (C) 2003 - 2008 Paul Mundt
|
|
*
|
|
* Started from SH3/4 version:
|
|
* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
|
|
*
|
|
* Original x86 implementation:
|
|
* By Ross Biro 1/23/92
|
|
* edited by Linus Torvalds
|
|
*
|
|
* 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/rwsem.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/user.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/audit.h>
|
|
#include <linux/seccomp.h>
|
|
#include <linux/tracehook.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/regset.h>
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/system.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/syscalls.h>
|
|
#include <asm/fpu.h>
|
|
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/syscalls.h>
|
|
|
|
/* This mask defines the bits of the SR which the user is not allowed to
|
|
change, which are everything except S, Q, M, PR, SZ, FR. */
|
|
#define SR_MASK (0xffff8cfd)
|
|
|
|
/*
|
|
* does not yet catch signals sent when the child dies.
|
|
* in exit.c or in signal.c.
|
|
*/
|
|
|
|
/*
|
|
* This routine will get a word from the user area in the process kernel stack.
|
|
*/
|
|
static inline int get_stack_long(struct task_struct *task, int offset)
|
|
{
|
|
unsigned char *stack;
|
|
|
|
stack = (unsigned char *)(task->thread.uregs);
|
|
stack += offset;
|
|
return (*((int *)stack));
|
|
}
|
|
|
|
static inline unsigned long
|
|
get_fpu_long(struct task_struct *task, unsigned long addr)
|
|
{
|
|
unsigned long tmp;
|
|
struct pt_regs *regs;
|
|
regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
|
|
|
|
if (!tsk_used_math(task)) {
|
|
if (addr == offsetof(struct user_fpu_struct, fpscr)) {
|
|
tmp = FPSCR_INIT;
|
|
} else {
|
|
tmp = 0xffffffffUL; /* matches initial value in fpu.c */
|
|
}
|
|
return tmp;
|
|
}
|
|
|
|
if (last_task_used_math == task) {
|
|
enable_fpu();
|
|
save_fpu(task);
|
|
disable_fpu();
|
|
last_task_used_math = 0;
|
|
regs->sr |= SR_FD;
|
|
}
|
|
|
|
tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
|
|
return tmp;
|
|
}
|
|
|
|
/*
|
|
* This routine will put a word into the user area in the process kernel stack.
|
|
*/
|
|
static inline int put_stack_long(struct task_struct *task, int offset,
|
|
unsigned long data)
|
|
{
|
|
unsigned char *stack;
|
|
|
|
stack = (unsigned char *)(task->thread.uregs);
|
|
stack += offset;
|
|
*(unsigned long *) stack = data;
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
|
|
{
|
|
struct pt_regs *regs;
|
|
|
|
regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
|
|
|
|
if (!tsk_used_math(task)) {
|
|
init_fpu(task);
|
|
} else if (last_task_used_math == task) {
|
|
enable_fpu();
|
|
save_fpu(task);
|
|
disable_fpu();
|
|
last_task_used_math = 0;
|
|
regs->sr |= SR_FD;
|
|
}
|
|
|
|
((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
|
|
return 0;
|
|
}
|
|
|
|
void user_enable_single_step(struct task_struct *child)
|
|
{
|
|
struct pt_regs *regs = child->thread.uregs;
|
|
|
|
regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
|
|
|
|
set_tsk_thread_flag(child, TIF_SINGLESTEP);
|
|
}
|
|
|
|
void user_disable_single_step(struct task_struct *child)
|
|
{
|
|
struct pt_regs *regs = child->thread.uregs;
|
|
|
|
regs->sr &= ~SR_SSTEP;
|
|
|
|
clear_tsk_thread_flag(child, TIF_SINGLESTEP);
|
|
}
|
|
|
|
static int genregs_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
const struct pt_regs *regs = task_pt_regs(target);
|
|
int ret;
|
|
|
|
/* PC, SR, SYSCALL */
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
®s->pc,
|
|
0, 3 * sizeof(unsigned long long));
|
|
|
|
/* R1 -> R63 */
|
|
if (!ret)
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
regs->regs,
|
|
offsetof(struct pt_regs, regs[0]),
|
|
63 * sizeof(unsigned long long));
|
|
/* TR0 -> TR7 */
|
|
if (!ret)
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
regs->tregs,
|
|
offsetof(struct pt_regs, tregs[0]),
|
|
8 * sizeof(unsigned long long));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
|
|
sizeof(struct pt_regs), -1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int genregs_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
struct pt_regs *regs = task_pt_regs(target);
|
|
int ret;
|
|
|
|
/* PC, SR, SYSCALL */
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
®s->pc,
|
|
0, 3 * sizeof(unsigned long long));
|
|
|
|
/* R1 -> R63 */
|
|
if (!ret && count > 0)
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
regs->regs,
|
|
offsetof(struct pt_regs, regs[0]),
|
|
63 * sizeof(unsigned long long));
|
|
|
|
/* TR0 -> TR7 */
|
|
if (!ret && count > 0)
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
regs->tregs,
|
|
offsetof(struct pt_regs, tregs[0]),
|
|
8 * sizeof(unsigned long long));
|
|
|
|
if (!ret)
|
|
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
|
|
sizeof(struct pt_regs), -1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_SH_FPU
|
|
int fpregs_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_fpu(target);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.xstate->hardfpu, 0, -1);
|
|
}
|
|
|
|
static int fpregs_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_fpu(target);
|
|
if (ret)
|
|
return ret;
|
|
|
|
set_stopped_child_used_math(target);
|
|
|
|
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
|
&target->thread.xstate->hardfpu, 0, -1);
|
|
}
|
|
|
|
static int fpregs_active(struct task_struct *target,
|
|
const struct user_regset *regset)
|
|
{
|
|
return tsk_used_math(target) ? regset->n : 0;
|
|
}
|
|
#endif
|
|
|
|
const struct pt_regs_offset regoffset_table[] = {
|
|
REG_OFFSET_NAME(pc),
|
|
REG_OFFSET_NAME(sr),
|
|
REG_OFFSET_NAME(syscall_nr),
|
|
REGS_OFFSET_NAME(0),
|
|
REGS_OFFSET_NAME(1),
|
|
REGS_OFFSET_NAME(2),
|
|
REGS_OFFSET_NAME(3),
|
|
REGS_OFFSET_NAME(4),
|
|
REGS_OFFSET_NAME(5),
|
|
REGS_OFFSET_NAME(6),
|
|
REGS_OFFSET_NAME(7),
|
|
REGS_OFFSET_NAME(8),
|
|
REGS_OFFSET_NAME(9),
|
|
REGS_OFFSET_NAME(10),
|
|
REGS_OFFSET_NAME(11),
|
|
REGS_OFFSET_NAME(12),
|
|
REGS_OFFSET_NAME(13),
|
|
REGS_OFFSET_NAME(14),
|
|
REGS_OFFSET_NAME(15),
|
|
REGS_OFFSET_NAME(16),
|
|
REGS_OFFSET_NAME(17),
|
|
REGS_OFFSET_NAME(18),
|
|
REGS_OFFSET_NAME(19),
|
|
REGS_OFFSET_NAME(20),
|
|
REGS_OFFSET_NAME(21),
|
|
REGS_OFFSET_NAME(22),
|
|
REGS_OFFSET_NAME(23),
|
|
REGS_OFFSET_NAME(24),
|
|
REGS_OFFSET_NAME(25),
|
|
REGS_OFFSET_NAME(26),
|
|
REGS_OFFSET_NAME(27),
|
|
REGS_OFFSET_NAME(28),
|
|
REGS_OFFSET_NAME(29),
|
|
REGS_OFFSET_NAME(30),
|
|
REGS_OFFSET_NAME(31),
|
|
REGS_OFFSET_NAME(32),
|
|
REGS_OFFSET_NAME(33),
|
|
REGS_OFFSET_NAME(34),
|
|
REGS_OFFSET_NAME(35),
|
|
REGS_OFFSET_NAME(36),
|
|
REGS_OFFSET_NAME(37),
|
|
REGS_OFFSET_NAME(38),
|
|
REGS_OFFSET_NAME(39),
|
|
REGS_OFFSET_NAME(40),
|
|
REGS_OFFSET_NAME(41),
|
|
REGS_OFFSET_NAME(42),
|
|
REGS_OFFSET_NAME(43),
|
|
REGS_OFFSET_NAME(44),
|
|
REGS_OFFSET_NAME(45),
|
|
REGS_OFFSET_NAME(46),
|
|
REGS_OFFSET_NAME(47),
|
|
REGS_OFFSET_NAME(48),
|
|
REGS_OFFSET_NAME(49),
|
|
REGS_OFFSET_NAME(50),
|
|
REGS_OFFSET_NAME(51),
|
|
REGS_OFFSET_NAME(52),
|
|
REGS_OFFSET_NAME(53),
|
|
REGS_OFFSET_NAME(54),
|
|
REGS_OFFSET_NAME(55),
|
|
REGS_OFFSET_NAME(56),
|
|
REGS_OFFSET_NAME(57),
|
|
REGS_OFFSET_NAME(58),
|
|
REGS_OFFSET_NAME(59),
|
|
REGS_OFFSET_NAME(60),
|
|
REGS_OFFSET_NAME(61),
|
|
REGS_OFFSET_NAME(62),
|
|
REGS_OFFSET_NAME(63),
|
|
TREGS_OFFSET_NAME(0),
|
|
TREGS_OFFSET_NAME(1),
|
|
TREGS_OFFSET_NAME(2),
|
|
TREGS_OFFSET_NAME(3),
|
|
TREGS_OFFSET_NAME(4),
|
|
TREGS_OFFSET_NAME(5),
|
|
TREGS_OFFSET_NAME(6),
|
|
TREGS_OFFSET_NAME(7),
|
|
REG_OFFSET_END,
|
|
};
|
|
|
|
/*
|
|
* These are our native regset flavours.
|
|
*/
|
|
enum sh_regset {
|
|
REGSET_GENERAL,
|
|
#ifdef CONFIG_SH_FPU
|
|
REGSET_FPU,
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset sh_regsets[] = {
|
|
/*
|
|
* Format is:
|
|
* PC, SR, SYSCALL,
|
|
* R1 --> R63,
|
|
* TR0 --> TR7,
|
|
*/
|
|
[REGSET_GENERAL] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = ELF_NGREG,
|
|
.size = sizeof(long long),
|
|
.align = sizeof(long long),
|
|
.get = genregs_get,
|
|
.set = genregs_set,
|
|
},
|
|
|
|
#ifdef CONFIG_SH_FPU
|
|
[REGSET_FPU] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(struct user_fpu_struct) /
|
|
sizeof(long long),
|
|
.size = sizeof(long long),
|
|
.align = sizeof(long long),
|
|
.get = fpregs_get,
|
|
.set = fpregs_set,
|
|
.active = fpregs_active,
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset_view user_sh64_native_view = {
|
|
.name = "sh64",
|
|
.e_machine = EM_SH,
|
|
.regsets = sh_regsets,
|
|
.n = ARRAY_SIZE(sh_regsets),
|
|
};
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
return &user_sh64_native_view;
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
int ret;
|
|
unsigned long __user *datap = (unsigned long __user *) data;
|
|
|
|
switch (request) {
|
|
/* read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
unsigned long tmp;
|
|
|
|
ret = -EIO;
|
|
if ((addr & 3) || addr < 0)
|
|
break;
|
|
|
|
if (addr < sizeof(struct pt_regs))
|
|
tmp = get_stack_long(child, addr);
|
|
else if ((addr >= offsetof(struct user, fpu)) &&
|
|
(addr < offsetof(struct user, u_fpvalid))) {
|
|
unsigned long index;
|
|
ret = init_fpu(child);
|
|
if (ret)
|
|
break;
|
|
index = addr - offsetof(struct user, fpu);
|
|
tmp = get_fpu_long(child, index);
|
|
} else if (addr == offsetof(struct user, u_fpvalid)) {
|
|
tmp = !!tsk_used_math(child);
|
|
} else {
|
|
break;
|
|
}
|
|
ret = put_user(tmp, datap);
|
|
break;
|
|
}
|
|
|
|
case PTRACE_POKEUSR:
|
|
/* write the word at location addr in the USER area. We must
|
|
disallow any changes to certain SR bits or u_fpvalid, since
|
|
this could crash the kernel or result in a security
|
|
loophole. */
|
|
ret = -EIO;
|
|
if ((addr & 3) || addr < 0)
|
|
break;
|
|
|
|
if (addr < sizeof(struct pt_regs)) {
|
|
/* Ignore change of top 32 bits of SR */
|
|
if (addr == offsetof (struct pt_regs, sr)+4)
|
|
{
|
|
ret = 0;
|
|
break;
|
|
}
|
|
/* If lower 32 bits of SR, ignore non-user bits */
|
|
if (addr == offsetof (struct pt_regs, sr))
|
|
{
|
|
long cursr = get_stack_long(child, addr);
|
|
data &= ~(SR_MASK);
|
|
data |= (cursr & SR_MASK);
|
|
}
|
|
ret = put_stack_long(child, addr, data);
|
|
}
|
|
else if ((addr >= offsetof(struct user, fpu)) &&
|
|
(addr < offsetof(struct user, u_fpvalid))) {
|
|
unsigned long index;
|
|
ret = init_fpu(child);
|
|
if (ret)
|
|
break;
|
|
index = addr - offsetof(struct user, fpu);
|
|
ret = put_fpu_long(child, index, data);
|
|
}
|
|
break;
|
|
|
|
case PTRACE_GETREGS:
|
|
return copy_regset_to_user(child, &user_sh64_native_view,
|
|
REGSET_GENERAL,
|
|
0, sizeof(struct pt_regs),
|
|
datap);
|
|
case PTRACE_SETREGS:
|
|
return copy_regset_from_user(child, &user_sh64_native_view,
|
|
REGSET_GENERAL,
|
|
0, sizeof(struct pt_regs),
|
|
datap);
|
|
#ifdef CONFIG_SH_FPU
|
|
case PTRACE_GETFPREGS:
|
|
return copy_regset_to_user(child, &user_sh64_native_view,
|
|
REGSET_FPU,
|
|
0, sizeof(struct user_fpu_struct),
|
|
datap);
|
|
case PTRACE_SETFPREGS:
|
|
return copy_regset_from_user(child, &user_sh64_native_view,
|
|
REGSET_FPU,
|
|
0, sizeof(struct user_fpu_struct),
|
|
datap);
|
|
#endif
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
asmlinkage int sh64_ptrace(long request, long pid,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
#define WPC_DBRMODE 0x0d104008
|
|
static unsigned long first_call;
|
|
|
|
if (!test_and_set_bit(0, &first_call)) {
|
|
/* Set WPC.DBRMODE to 0. This makes all debug events get
|
|
* delivered through RESVEC, i.e. into the handlers in entry.S.
|
|
* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
|
|
* would normally be left set to 1, which makes debug events get
|
|
* delivered through DBRVEC, i.e. into the remote gdb's
|
|
* handlers. This prevents ptrace getting them, and confuses
|
|
* the remote gdb.) */
|
|
printk("DBRMODE set to 0 to permit native debugging\n");
|
|
poke_real_address_q(WPC_DBRMODE, 0);
|
|
}
|
|
|
|
return sys_ptrace(request, pid, addr, data);
|
|
}
|
|
|
|
static inline int audit_arch(void)
|
|
{
|
|
int arch = EM_SH;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
arch |= __AUDIT_ARCH_64BIT;
|
|
#endif
|
|
#ifdef CONFIG_CPU_LITTLE_ENDIAN
|
|
arch |= __AUDIT_ARCH_LE;
|
|
#endif
|
|
|
|
return arch;
|
|
}
|
|
|
|
asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
long long ret = 0;
|
|
|
|
secure_computing(regs->regs[9]);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
|
|
tracehook_report_syscall_entry(regs))
|
|
/*
|
|
* Tracing decided this syscall should not happen.
|
|
* We'll return a bogus call number to get an ENOSYS
|
|
* error, but leave the original number in regs->regs[0].
|
|
*/
|
|
ret = -1LL;
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_enter(regs, regs->regs[9]);
|
|
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_entry(audit_arch(), regs->regs[1],
|
|
regs->regs[2], regs->regs[3],
|
|
regs->regs[4], regs->regs[5]);
|
|
|
|
return ret ?: regs->regs[9];
|
|
}
|
|
|
|
asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
|
|
{
|
|
int step;
|
|
|
|
if (unlikely(current->audit_context))
|
|
audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
|
|
regs->regs[9]);
|
|
|
|
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
|
|
trace_sys_exit(regs, regs->regs[9]);
|
|
|
|
step = test_thread_flag(TIF_SINGLESTEP);
|
|
if (step || test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall_exit(regs, step);
|
|
}
|
|
|
|
/* Called with interrupts disabled */
|
|
asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
|
|
{
|
|
/* This is called after a single step exception (DEBUGSS).
|
|
There is no need to change the PC, as it is a post-execution
|
|
exception, as entry.S does not do anything to the PC for DEBUGSS.
|
|
We need to clear the Single Step setting in SR to avoid
|
|
continually stepping. */
|
|
local_irq_enable();
|
|
regs->sr &= ~SR_SSTEP;
|
|
force_sig(SIGTRAP, current);
|
|
}
|
|
|
|
/* Called with interrupts disabled */
|
|
BUILD_TRAP_HANDLER(breakpoint)
|
|
{
|
|
TRAP_HANDLER_DECL;
|
|
|
|
/* We need to forward step the PC, to counteract the backstep done
|
|
in signal.c. */
|
|
local_irq_enable();
|
|
force_sig(SIGTRAP, current);
|
|
regs->pc += 4;
|
|
}
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
user_disable_single_step(child);
|
|
}
|