mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 10:06:47 +07:00
dc8f6029cd
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
500 lines
11 KiB
C
500 lines
11 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Copyright (C) 1992 Ross Biro
|
|
* Copyright (C) Linus Torvalds
|
|
* Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
|
|
* Copyright (C) 1996 David S. Miller
|
|
* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
|
* Copyright (C) 1999 MIPS Technologies, Inc.
|
|
* Copyright (C) 2000 Ulf Carlsson
|
|
*
|
|
* At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
|
|
* binaries.
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/audit.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/user.h>
|
|
#include <linux/security.h>
|
|
#include <linux/signal.h>
|
|
|
|
#include <asm/byteorder.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/dsp.h>
|
|
#include <asm/fpu.h>
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/mipsmtregs.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/page.h>
|
|
#include <asm/system.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/reg.h>
|
|
|
|
/*
|
|
* Called by kernel/ptrace.c when detaching..
|
|
*
|
|
* Make sure single step bits etc are not set.
|
|
*/
|
|
void ptrace_disable(struct task_struct *child)
|
|
{
|
|
/* Nothing to do.. */
|
|
}
|
|
|
|
/*
|
|
* Read a general register set. We always use the 64-bit format, even
|
|
* for 32-bit kernels and for 32-bit processes on a 64-bit kernel.
|
|
* Registers are sign extended to fill the available space.
|
|
*/
|
|
int ptrace_getregs (struct task_struct *child, __s64 __user *data)
|
|
{
|
|
struct pt_regs *regs;
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_WRITE, data, 38 * 8))
|
|
return -EIO;
|
|
|
|
regs = task_pt_regs(child);
|
|
|
|
for (i = 0; i < 32; i++)
|
|
__put_user (regs->regs[i], data + i);
|
|
__put_user (regs->lo, data + EF_LO - EF_R0);
|
|
__put_user (regs->hi, data + EF_HI - EF_R0);
|
|
__put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
|
|
__put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
|
|
__put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
|
|
__put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Write a general register set. As for PTRACE_GETREGS, we always use
|
|
* the 64-bit format. On a 32-bit kernel only the lower order half
|
|
* (according to endianness) will be used.
|
|
*/
|
|
int ptrace_setregs (struct task_struct *child, __s64 __user *data)
|
|
{
|
|
struct pt_regs *regs;
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_READ, data, 38 * 8))
|
|
return -EIO;
|
|
|
|
regs = task_pt_regs(child);
|
|
|
|
for (i = 0; i < 32; i++)
|
|
__get_user (regs->regs[i], data + i);
|
|
__get_user (regs->lo, data + EF_LO - EF_R0);
|
|
__get_user (regs->hi, data + EF_HI - EF_R0);
|
|
__get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
|
|
|
|
/* badvaddr, status, and cause may not be written. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
|
|
{
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_WRITE, data, 33 * 8))
|
|
return -EIO;
|
|
|
|
if (tsk_used_math(child)) {
|
|
fpureg_t *fregs = get_fpu_regs(child);
|
|
for (i = 0; i < 32; i++)
|
|
__put_user (fregs[i], i + (__u64 __user *) data);
|
|
} else {
|
|
for (i = 0; i < 32; i++)
|
|
__put_user ((__u64) -1, i + (__u64 __user *) data);
|
|
}
|
|
|
|
if (cpu_has_fpu) {
|
|
unsigned int flags, tmp;
|
|
|
|
__put_user (child->thread.fpu.hard.fcr31, data + 64);
|
|
|
|
preempt_disable();
|
|
if (cpu_has_mipsmt) {
|
|
unsigned int vpflags = dvpe();
|
|
flags = read_c0_status();
|
|
__enable_fpu();
|
|
__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
|
|
write_c0_status(flags);
|
|
evpe(vpflags);
|
|
} else {
|
|
flags = read_c0_status();
|
|
__enable_fpu();
|
|
__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
|
|
write_c0_status(flags);
|
|
}
|
|
preempt_enable();
|
|
__put_user (tmp, data + 65);
|
|
} else {
|
|
__put_user (child->thread.fpu.soft.fcr31, data + 64);
|
|
__put_user ((__u32) 0, data + 65);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ptrace_setfpregs (struct task_struct *child, __u32 __user *data)
|
|
{
|
|
fpureg_t *fregs;
|
|
int i;
|
|
|
|
if (!access_ok(VERIFY_READ, data, 33 * 8))
|
|
return -EIO;
|
|
|
|
fregs = get_fpu_regs(child);
|
|
|
|
for (i = 0; i < 32; i++)
|
|
__get_user (fregs[i], i + (__u64 __user *) data);
|
|
|
|
if (cpu_has_fpu)
|
|
__get_user (child->thread.fpu.hard.fcr31, data + 64);
|
|
else
|
|
__get_user (child->thread.fpu.soft.fcr31, data + 64);
|
|
|
|
/* FIR may not be written. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request, long addr, long data)
|
|
{
|
|
int ret;
|
|
|
|
switch (request) {
|
|
/* when I and D space are separate, these will need to be fixed. */
|
|
case PTRACE_PEEKTEXT: /* read word at location addr. */
|
|
case PTRACE_PEEKDATA: {
|
|
unsigned long tmp;
|
|
int copied;
|
|
|
|
copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
|
|
ret = -EIO;
|
|
if (copied != sizeof(tmp))
|
|
break;
|
|
ret = put_user(tmp,(unsigned long __user *) data);
|
|
break;
|
|
}
|
|
|
|
/* Read the word at location addr in the USER area. */
|
|
case PTRACE_PEEKUSR: {
|
|
struct pt_regs *regs;
|
|
unsigned long tmp = 0;
|
|
|
|
regs = task_pt_regs(child);
|
|
ret = 0; /* Default return value. */
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
tmp = regs->regs[addr];
|
|
break;
|
|
case FPR_BASE ... FPR_BASE + 31:
|
|
if (tsk_used_math(child)) {
|
|
fpureg_t *fregs = get_fpu_regs(child);
|
|
|
|
#ifdef CONFIG_32BIT
|
|
/*
|
|
* The odd registers are actually the high
|
|
* order bits of the values stored in the even
|
|
* registers - unless we're using r2k_switch.S.
|
|
*/
|
|
if (addr & 1)
|
|
tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
|
|
else
|
|
tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
tmp = fregs[addr - FPR_BASE];
|
|
#endif
|
|
} else {
|
|
tmp = -1; /* FP not yet used */
|
|
}
|
|
break;
|
|
case PC:
|
|
tmp = regs->cp0_epc;
|
|
break;
|
|
case CAUSE:
|
|
tmp = regs->cp0_cause;
|
|
break;
|
|
case BADVADDR:
|
|
tmp = regs->cp0_badvaddr;
|
|
break;
|
|
case MMHI:
|
|
tmp = regs->hi;
|
|
break;
|
|
case MMLO:
|
|
tmp = regs->lo;
|
|
break;
|
|
case FPC_CSR:
|
|
if (cpu_has_fpu)
|
|
tmp = child->thread.fpu.hard.fcr31;
|
|
else
|
|
tmp = child->thread.fpu.soft.fcr31;
|
|
break;
|
|
case FPC_EIR: { /* implementation / version register */
|
|
unsigned int flags;
|
|
|
|
if (!cpu_has_fpu)
|
|
break;
|
|
|
|
preempt_disable();
|
|
if (cpu_has_mipsmt) {
|
|
unsigned int vpflags = dvpe();
|
|
flags = read_c0_status();
|
|
__enable_fpu();
|
|
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
|
|
write_c0_status(flags);
|
|
evpe(vpflags);
|
|
} else {
|
|
flags = read_c0_status();
|
|
__enable_fpu();
|
|
__asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
|
|
write_c0_status(flags);
|
|
}
|
|
preempt_enable();
|
|
break;
|
|
}
|
|
case DSP_BASE ... DSP_BASE + 5: {
|
|
dspreg_t *dregs;
|
|
|
|
if (!cpu_has_dsp) {
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
dregs = __get_dsp_regs(child);
|
|
tmp = (unsigned long) (dregs[addr - DSP_BASE]);
|
|
break;
|
|
}
|
|
case DSP_CONTROL:
|
|
if (!cpu_has_dsp) {
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
tmp = child->thread.dsp.dspcontrol;
|
|
break;
|
|
default:
|
|
tmp = 0;
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
ret = put_user(tmp, (unsigned long __user *) data);
|
|
break;
|
|
}
|
|
|
|
/* when I and D space are separate, this will have to be fixed. */
|
|
case PTRACE_POKETEXT: /* write the word at location addr. */
|
|
case PTRACE_POKEDATA:
|
|
ret = 0;
|
|
if (access_process_vm(child, addr, &data, sizeof(data), 1)
|
|
== sizeof(data))
|
|
break;
|
|
ret = -EIO;
|
|
break;
|
|
|
|
case PTRACE_POKEUSR: {
|
|
struct pt_regs *regs;
|
|
ret = 0;
|
|
regs = task_pt_regs(child);
|
|
|
|
switch (addr) {
|
|
case 0 ... 31:
|
|
regs->regs[addr] = data;
|
|
break;
|
|
case FPR_BASE ... FPR_BASE + 31: {
|
|
fpureg_t *fregs = get_fpu_regs(child);
|
|
|
|
if (!tsk_used_math(child)) {
|
|
/* FP not yet used */
|
|
memset(&child->thread.fpu.hard, ~0,
|
|
sizeof(child->thread.fpu.hard));
|
|
child->thread.fpu.hard.fcr31 = 0;
|
|
}
|
|
#ifdef CONFIG_32BIT
|
|
/*
|
|
* The odd registers are actually the high order bits
|
|
* of the values stored in the even registers - unless
|
|
* we're using r2k_switch.S.
|
|
*/
|
|
if (addr & 1) {
|
|
fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
|
|
fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
|
|
} else {
|
|
fregs[addr - FPR_BASE] &= ~0xffffffffLL;
|
|
fregs[addr - FPR_BASE] |= data;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_64BIT
|
|
fregs[addr - FPR_BASE] = data;
|
|
#endif
|
|
break;
|
|
}
|
|
case PC:
|
|
regs->cp0_epc = data;
|
|
break;
|
|
case MMHI:
|
|
regs->hi = data;
|
|
break;
|
|
case MMLO:
|
|
regs->lo = data;
|
|
break;
|
|
case FPC_CSR:
|
|
if (cpu_has_fpu)
|
|
child->thread.fpu.hard.fcr31 = data;
|
|
else
|
|
child->thread.fpu.soft.fcr31 = data;
|
|
break;
|
|
case DSP_BASE ... DSP_BASE + 5: {
|
|
dspreg_t *dregs;
|
|
|
|
if (!cpu_has_dsp) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
dregs = __get_dsp_regs(child);
|
|
dregs[addr - DSP_BASE] = data;
|
|
break;
|
|
}
|
|
case DSP_CONTROL:
|
|
if (!cpu_has_dsp) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
child->thread.dsp.dspcontrol = data;
|
|
break;
|
|
default:
|
|
/* The rest are not allowed. */
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case PTRACE_GETREGS:
|
|
ret = ptrace_getregs (child, (__u64 __user *) data);
|
|
break;
|
|
|
|
case PTRACE_SETREGS:
|
|
ret = ptrace_setregs (child, (__u64 __user *) data);
|
|
break;
|
|
|
|
case PTRACE_GETFPREGS:
|
|
ret = ptrace_getfpregs (child, (__u32 __user *) data);
|
|
break;
|
|
|
|
case PTRACE_SETFPREGS:
|
|
ret = ptrace_setfpregs (child, (__u32 __user *) data);
|
|
break;
|
|
|
|
case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
|
|
case PTRACE_CONT: { /* restart after signal. */
|
|
ret = -EIO;
|
|
if (!valid_signal(data))
|
|
break;
|
|
if (request == PTRACE_SYSCALL) {
|
|
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
}
|
|
else {
|
|
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
|
|
}
|
|
child->exit_code = data;
|
|
wake_up_process(child);
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* make the child exit. Best I can do is send it a sigkill.
|
|
* perhaps it should be put in the status that it wants to
|
|
* exit.
|
|
*/
|
|
case PTRACE_KILL:
|
|
ret = 0;
|
|
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
|
|
break;
|
|
child->exit_code = SIGKILL;
|
|
wake_up_process(child);
|
|
break;
|
|
|
|
case PTRACE_DETACH: /* detach a process that was attached. */
|
|
ret = ptrace_detach(child, data);
|
|
break;
|
|
|
|
case PTRACE_GET_THREAD_AREA:
|
|
ret = put_user(task_thread_info(child)->tp_value,
|
|
(unsigned long __user *) data);
|
|
break;
|
|
|
|
default:
|
|
ret = ptrace_request(child, request, addr, data);
|
|
break;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static inline int audit_arch(void)
|
|
{
|
|
int arch = EM_MIPS;
|
|
#ifdef CONFIG_64BIT
|
|
arch |= __AUDIT_ARCH_64BIT;
|
|
#endif
|
|
#if defined(__LITTLE_ENDIAN)
|
|
arch |= __AUDIT_ARCH_LE;
|
|
#endif
|
|
return arch;
|
|
}
|
|
|
|
/*
|
|
* Notification of system call entry/exit
|
|
* - triggered by current->work.syscall_trace
|
|
*/
|
|
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
|
|
{
|
|
if (unlikely(current->audit_context) && entryexit)
|
|
audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]),
|
|
regs->regs[2]);
|
|
|
|
if (!(current->ptrace & PT_PTRACED))
|
|
goto out;
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
|
goto out;
|
|
|
|
/* The 0x80 provides a way for the tracing parent to distinguish
|
|
between a syscall stop and SIGTRAP delivery */
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
|
|
0x80 : 0));
|
|
|
|
/*
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
* for normal use. strace only continues with a signal if the
|
|
* stopping signal is not SIGTRAP. -brl
|
|
*/
|
|
if (current->exit_code) {
|
|
send_sig(current->exit_code, current, 1);
|
|
current->exit_code = 0;
|
|
}
|
|
out:
|
|
if (unlikely(current->audit_context) && !entryexit)
|
|
audit_syscall_entry(current, audit_arch(), regs->regs[2],
|
|
regs->regs[4], regs->regs[5],
|
|
regs->regs[6], regs->regs[7]);
|
|
}
|