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linux-stable-mirror/arch/s390/kernel/ptrace.c
T
Linus Torvalds bf4afc53b7 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 
This was done entirely with mindless brute force, using

    git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
        xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'

to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.

Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.

For the same reason the 'flex' versions will be done as a separate
conversion.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2026-02-21 17:09:51 -08:00

1022 lines
27 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* Ptrace user space interface.
*
* Copyright IBM Corp. 1999, 2010
* Author(s): Denis Joseph Barrow
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/cpufeature.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/security.h>
#include <linux/audit.h>
#include <linux/signal.h>
#include <linux/elf.h>
#include <linux/regset.h>
#include <linux/seccomp.h>
#include <trace/syscall.h>
#include <asm/guarded_storage.h>
#include <asm/access-regs.h>
#include <asm/page.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include <asm/runtime_instr.h>
#include <asm/facility.h>
#include <asm/machine.h>
#include <asm/ptrace.h>
#include <asm/rwonce.h>
#include <asm/fpu.h>
#include "entry.h"
void update_cr_regs(struct task_struct *task)
{
struct pt_regs *regs = task_pt_regs(task);
struct thread_struct *thread = &task->thread;
union ctlreg0 cr0_old, cr0_new;
union ctlreg2 cr2_old, cr2_new;
int cr0_changed, cr2_changed;
union {
struct ctlreg regs[3];
struct {
struct ctlreg control;
struct ctlreg start;
struct ctlreg end;
};
} old, new;
local_ctl_store(0, &cr0_old.reg);
local_ctl_store(2, &cr2_old.reg);
cr0_new = cr0_old;
cr2_new = cr2_old;
/* Take care of the enable/disable of transactional execution. */
if (machine_has_tx()) {
/* Set or clear transaction execution TXC bit 8. */
cr0_new.tcx = 1;
if (task->thread.per_flags & PER_FLAG_NO_TE)
cr0_new.tcx = 0;
/* Set or clear transaction execution TDC bits 62 and 63. */
cr2_new.tdc = 0;
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND) {
if (task->thread.per_flags & PER_FLAG_TE_ABORT_RAND_TEND)
cr2_new.tdc = 1;
else
cr2_new.tdc = 2;
}
}
/* Take care of enable/disable of guarded storage. */
if (cpu_has_gs()) {
cr2_new.gse = 0;
if (task->thread.gs_cb)
cr2_new.gse = 1;
}
/* Load control register 0/2 iff changed */
cr0_changed = cr0_new.val != cr0_old.val;
cr2_changed = cr2_new.val != cr2_old.val;
if (cr0_changed)
local_ctl_load(0, &cr0_new.reg);
if (cr2_changed)
local_ctl_load(2, &cr2_new.reg);
/* Copy user specified PER registers */
new.control.val = thread->per_user.control;
new.start.val = thread->per_user.start;
new.end.val = thread->per_user.end;
/* merge TIF_SINGLE_STEP into user specified PER registers. */
if (test_tsk_thread_flag(task, TIF_SINGLE_STEP) ||
test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP)) {
if (test_tsk_thread_flag(task, TIF_BLOCK_STEP))
new.control.val |= PER_EVENT_BRANCH;
else
new.control.val |= PER_EVENT_IFETCH;
new.control.val |= PER_CONTROL_SUSPENSION;
new.control.val |= PER_EVENT_TRANSACTION_END;
if (test_tsk_thread_flag(task, TIF_UPROBE_SINGLESTEP))
new.control.val |= PER_EVENT_IFETCH;
new.start.val = 0;
new.end.val = -1UL;
}
/* Take care of the PER enablement bit in the PSW. */
if (!(new.control.val & PER_EVENT_MASK)) {
regs->psw.mask &= ~PSW_MASK_PER;
return;
}
regs->psw.mask |= PSW_MASK_PER;
__local_ctl_store(9, 11, old.regs);
if (memcmp(&new, &old, sizeof(struct per_regs)) != 0)
__local_ctl_load(9, 11, new.regs);
}
void user_enable_single_step(struct task_struct *task)
{
clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
set_tsk_thread_flag(task, TIF_SINGLE_STEP);
}
void user_disable_single_step(struct task_struct *task)
{
clear_tsk_thread_flag(task, TIF_BLOCK_STEP);
clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
}
void user_enable_block_step(struct task_struct *task)
{
set_tsk_thread_flag(task, TIF_SINGLE_STEP);
set_tsk_thread_flag(task, TIF_BLOCK_STEP);
}
/*
* Called by kernel/ptrace.c when detaching..
*
* Clear all debugging related fields.
*/
void ptrace_disable(struct task_struct *task)
{
memset(&task->thread.per_user, 0, sizeof(task->thread.per_user));
memset(&task->thread.per_event, 0, sizeof(task->thread.per_event));
clear_tsk_thread_flag(task, TIF_SINGLE_STEP);
clear_tsk_thread_flag(task, TIF_PER_TRAP);
task->thread.per_flags = 0;
}
#define __ADDR_MASK 7
static inline unsigned long __peek_user_per(struct task_struct *child,
addr_t addr)
{
if (addr == offsetof(struct per_struct_kernel, cr9))
/* Control bits of the active per set. */
return test_thread_flag(TIF_SINGLE_STEP) ?
PER_EVENT_IFETCH : child->thread.per_user.control;
else if (addr == offsetof(struct per_struct_kernel, cr10))
/* Start address of the active per set. */
return test_thread_flag(TIF_SINGLE_STEP) ?
0 : child->thread.per_user.start;
else if (addr == offsetof(struct per_struct_kernel, cr11))
/* End address of the active per set. */
return test_thread_flag(TIF_SINGLE_STEP) ?
-1UL : child->thread.per_user.end;
else if (addr == offsetof(struct per_struct_kernel, bits))
/* Single-step bit. */
return test_thread_flag(TIF_SINGLE_STEP) ?
(1UL << (BITS_PER_LONG - 1)) : 0;
else if (addr == offsetof(struct per_struct_kernel, starting_addr))
/* Start address of the user specified per set. */
return child->thread.per_user.start;
else if (addr == offsetof(struct per_struct_kernel, ending_addr))
/* End address of the user specified per set. */
return child->thread.per_user.end;
else if (addr == offsetof(struct per_struct_kernel, perc_atmid))
/* PER code, ATMID and AI of the last PER trap */
return (unsigned long)
child->thread.per_event.cause << (BITS_PER_LONG - 16);
else if (addr == offsetof(struct per_struct_kernel, address))
/* Address of the last PER trap */
return child->thread.per_event.address;
else if (addr == offsetof(struct per_struct_kernel, access_id))
/* Access id of the last PER trap */
return (unsigned long)
child->thread.per_event.paid << (BITS_PER_LONG - 8);
return 0;
}
/*
* Read the word at offset addr from the user area of a process. The
* trouble here is that the information is littered over different
* locations. The process registers are found on the kernel stack,
* the floating point stuff and the trace settings are stored in
* the task structure. In addition the different structures in
* struct user contain pad bytes that should be read as zeroes.
* Lovely...
*/
static unsigned long __peek_user(struct task_struct *child, addr_t addr)
{
addr_t offset, tmp;
if (addr < offsetof(struct user, regs.acrs)) {
/*
* psw and gprs are stored on the stack
*/
tmp = *(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr);
if (addr == offsetof(struct user, regs.psw.mask)) {
/* Return a clean psw mask. */
tmp &= PSW_MASK_USER | PSW_MASK_RI;
tmp |= PSW_USER_BITS;
}
} else if (addr < offsetof(struct user, regs.orig_gpr2)) {
/*
* access registers are stored in the thread structure
*/
offset = addr - offsetof(struct user, regs.acrs);
/*
* Very special case: old & broken 64 bit gdb reading
* from acrs[15]. Result is a 64 bit value. Read the
* 32 bit acrs[15] value and shift it by 32. Sick...
*/
if (addr == offsetof(struct user, regs.acrs[15]))
tmp = ((unsigned long) child->thread.acrs[15]) << 32;
else
tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset);
} else if (addr == offsetof(struct user, regs.orig_gpr2)) {
/*
* orig_gpr2 is stored on the kernel stack
*/
tmp = (addr_t) task_pt_regs(child)->orig_gpr2;
} else if (addr < offsetof(struct user, regs.fp_regs)) {
/*
* prevent reads of padding hole between
* orig_gpr2 and fp_regs on s390.
*/
tmp = 0;
} else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
/*
* floating point control reg. is in the thread structure
*/
tmp = child->thread.ufpu.fpc;
tmp <<= BITS_PER_LONG - 32;
} else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
/*
* floating point regs. are in the child->thread.ufpu.vxrs array
*/
offset = addr - offsetof(struct user, regs.fp_regs.fprs);
tmp = *(addr_t *)((addr_t)child->thread.ufpu.vxrs + 2 * offset);
} else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
/*
* Handle access to the per_info structure.
*/
addr -= offsetof(struct user, regs.per_info);
tmp = __peek_user_per(child, addr);
} else
tmp = 0;
return tmp;
}
static int
peek_user(struct task_struct *child, addr_t addr, addr_t data)
{
addr_t tmp, mask;
/*
* Stupid gdb peeks/pokes the access registers in 64 bit with
* an alignment of 4. Programmers from hell...
*/
mask = __ADDR_MASK;
if (addr >= offsetof(struct user, regs.acrs) &&
addr < offsetof(struct user, regs.orig_gpr2))
mask = 3;
if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
return -EIO;
tmp = __peek_user(child, addr);
return put_user(tmp, (addr_t __user *) data);
}
static inline void __poke_user_per(struct task_struct *child,
addr_t addr, addr_t data)
{
/*
* There are only three fields in the per_info struct that the
* debugger user can write to.
* 1) cr9: the debugger wants to set a new PER event mask
* 2) starting_addr: the debugger wants to set a new starting
* address to use with the PER event mask.
* 3) ending_addr: the debugger wants to set a new ending
* address to use with the PER event mask.
* The user specified PER event mask and the start and end
* addresses are used only if single stepping is not in effect.
* Writes to any other field in per_info are ignored.
*/
if (addr == offsetof(struct per_struct_kernel, cr9))
/* PER event mask of the user specified per set. */
child->thread.per_user.control =
data & (PER_EVENT_MASK | PER_CONTROL_MASK);
else if (addr == offsetof(struct per_struct_kernel, starting_addr))
/* Starting address of the user specified per set. */
child->thread.per_user.start = data;
else if (addr == offsetof(struct per_struct_kernel, ending_addr))
/* Ending address of the user specified per set. */
child->thread.per_user.end = data;
}
/*
* Write a word to the user area of a process at location addr. This
* operation does have an additional problem compared to peek_user.
* Stores to the program status word and on the floating point
* control register needs to get checked for validity.
*/
static int __poke_user(struct task_struct *child, addr_t addr, addr_t data)
{
addr_t offset;
if (addr < offsetof(struct user, regs.acrs)) {
struct pt_regs *regs = task_pt_regs(child);
/*
* psw and gprs are stored on the stack
*/
if (addr == offsetof(struct user, regs.psw.mask)) {
unsigned long mask = PSW_MASK_USER;
mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
if ((data ^ PSW_USER_BITS) & ~mask)
/* Invalid psw mask. */
return -EINVAL;
if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
/* Invalid address-space-control bits */
return -EINVAL;
if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
/* Invalid addressing mode bits */
return -EINVAL;
}
if (test_pt_regs_flag(regs, PIF_SYSCALL) &&
addr == offsetof(struct user, regs.gprs[2])) {
struct pt_regs *regs = task_pt_regs(child);
regs->int_code = 0x20000 | (data & 0xffff);
}
*(addr_t *)((addr_t) &regs->psw + addr) = data;
} else if (addr < offsetof(struct user, regs.orig_gpr2)) {
/*
* access registers are stored in the thread structure
*/
offset = addr - offsetof(struct user, regs.acrs);
/*
* Very special case: old & broken 64 bit gdb writing
* to acrs[15] with a 64 bit value. Ignore the lower
* half of the value and write the upper 32 bit to
* acrs[15]. Sick...
*/
if (addr == offsetof(struct user, regs.acrs[15]))
child->thread.acrs[15] = (unsigned int) (data >> 32);
else
*(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
} else if (addr == offsetof(struct user, regs.orig_gpr2)) {
/*
* orig_gpr2 is stored on the kernel stack
*/
task_pt_regs(child)->orig_gpr2 = data;
} else if (addr < offsetof(struct user, regs.fp_regs)) {
/*
* prevent writes of padding hole between
* orig_gpr2 and fp_regs on s390.
*/
return 0;
} else if (addr == offsetof(struct user, regs.fp_regs.fpc)) {
/*
* floating point control reg. is in the thread structure
*/
if ((unsigned int)data != 0)
return -EINVAL;
child->thread.ufpu.fpc = data >> (BITS_PER_LONG - 32);
} else if (addr < offsetof(struct user, regs.fp_regs) + sizeof(s390_fp_regs)) {
/*
* floating point regs. are in the child->thread.ufpu.vxrs array
*/
offset = addr - offsetof(struct user, regs.fp_regs.fprs);
*(addr_t *)((addr_t)child->thread.ufpu.vxrs + 2 * offset) = data;
} else if (addr < offsetof(struct user, regs.per_info) + sizeof(per_struct)) {
/*
* Handle access to the per_info structure.
*/
addr -= offsetof(struct user, regs.per_info);
__poke_user_per(child, addr, data);
}
return 0;
}
static int poke_user(struct task_struct *child, addr_t addr, addr_t data)
{
addr_t mask;
/*
* Stupid gdb peeks/pokes the access registers in 64 bit with
* an alignment of 4. Programmers from hell indeed...
*/
mask = __ADDR_MASK;
if (addr >= offsetof(struct user, regs.acrs) &&
addr < offsetof(struct user, regs.orig_gpr2))
mask = 3;
if ((addr & mask) || addr > sizeof(struct user) - __ADDR_MASK)
return -EIO;
return __poke_user(child, addr, data);
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
ptrace_area parea;
int copied, ret;
switch (request) {
case PTRACE_PEEKUSR:
/* read the word at location addr in the USER area. */
return peek_user(child, addr, data);
case PTRACE_POKEUSR:
/* write the word at location addr in the USER area */
return poke_user(child, addr, data);
case PTRACE_PEEKUSR_AREA:
case PTRACE_POKEUSR_AREA:
if (copy_from_user(&parea, (void __force __user *) addr,
sizeof(parea)))
return -EFAULT;
addr = parea.kernel_addr;
data = parea.process_addr;
copied = 0;
while (copied < parea.len) {
if (request == PTRACE_PEEKUSR_AREA)
ret = peek_user(child, addr, data);
else {
addr_t utmp;
if (get_user(utmp,
(addr_t __force __user *) data))
return -EFAULT;
ret = poke_user(child, addr, utmp);
}
if (ret)
return ret;
addr += sizeof(unsigned long);
data += sizeof(unsigned long);
copied += sizeof(unsigned long);
}
return 0;
case PTRACE_GET_LAST_BREAK:
return put_user(child->thread.last_break, (unsigned long __user *)data);
case PTRACE_ENABLE_TE:
if (!machine_has_tx())
return -EIO;
child->thread.per_flags &= ~PER_FLAG_NO_TE;
return 0;
case PTRACE_DISABLE_TE:
if (!machine_has_tx())
return -EIO;
child->thread.per_flags |= PER_FLAG_NO_TE;
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
return 0;
case PTRACE_TE_ABORT_RAND:
if (!machine_has_tx() || (child->thread.per_flags & PER_FLAG_NO_TE))
return -EIO;
switch (data) {
case 0UL:
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND;
break;
case 1UL:
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND_TEND;
break;
case 2UL:
child->thread.per_flags |= PER_FLAG_TE_ABORT_RAND;
child->thread.per_flags &= ~PER_FLAG_TE_ABORT_RAND_TEND;
break;
default:
return -EINVAL;
}
return 0;
default:
return ptrace_request(child, request, addr, data);
}
}
/*
* user_regset definitions.
*/
static int s390_regs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
unsigned pos;
if (target == current)
save_access_regs(target->thread.acrs);
for (pos = 0; pos < sizeof(s390_regs); pos += sizeof(long))
membuf_store(&to, __peek_user(target, pos));
return 0;
}
static int s390_regs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int rc = 0;
if (target == current)
save_access_regs(target->thread.acrs);
if (kbuf) {
const unsigned long *k = kbuf;
while (count > 0 && !rc) {
rc = __poke_user(target, pos, *k++);
count -= sizeof(*k);
pos += sizeof(*k);
}
} else {
const unsigned long __user *u = ubuf;
while (count > 0 && !rc) {
unsigned long word;
rc = __get_user(word, u++);
if (rc)
break;
rc = __poke_user(target, pos, word);
count -= sizeof(*u);
pos += sizeof(*u);
}
}
if (rc == 0 && target == current)
restore_access_regs(target->thread.acrs);
return rc;
}
static int s390_fpregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
_s390_fp_regs fp_regs;
if (target == current)
save_user_fpu_regs();
fp_regs.fpc = target->thread.ufpu.fpc;
fpregs_store(&fp_regs, &target->thread.ufpu);
return membuf_write(&to, &fp_regs, sizeof(fp_regs));
}
static int s390_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 rc = 0;
freg_t fprs[__NUM_FPRS];
if (target == current)
save_user_fpu_regs();
convert_vx_to_fp(fprs, target->thread.ufpu.vxrs);
if (count > 0 && pos < offsetof(s390_fp_regs, fprs)) {
u32 ufpc[2] = { target->thread.ufpu.fpc, 0 };
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ufpc,
0, offsetof(s390_fp_regs, fprs));
if (rc)
return rc;
if (ufpc[1] != 0)
return -EINVAL;
target->thread.ufpu.fpc = ufpc[0];
}
if (rc == 0 && count > 0)
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fprs, offsetof(s390_fp_regs, fprs), -1);
if (rc)
return rc;
convert_fp_to_vx(target->thread.ufpu.vxrs, fprs);
return rc;
}
static int s390_last_break_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
return membuf_store(&to, target->thread.last_break);
}
static int s390_last_break_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
return 0;
}
static int s390_tdb_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct pt_regs *regs = task_pt_regs(target);
size_t size;
if (!(regs->int_code & 0x200))
return -ENODATA;
size = sizeof(target->thread.trap_tdb.data);
return membuf_write(&to, target->thread.trap_tdb.data, size);
}
static int s390_tdb_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
return 0;
}
static int s390_vxrs_low_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
__u64 vxrs[__NUM_VXRS_LOW];
int i;
if (!cpu_has_vx())
return -ENODEV;
if (target == current)
save_user_fpu_regs();
for (i = 0; i < __NUM_VXRS_LOW; i++)
vxrs[i] = target->thread.ufpu.vxrs[i].low;
return membuf_write(&to, vxrs, sizeof(vxrs));
}
static int s390_vxrs_low_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
__u64 vxrs[__NUM_VXRS_LOW];
int i, rc;
if (!cpu_has_vx())
return -ENODEV;
if (target == current)
save_user_fpu_regs();
for (i = 0; i < __NUM_VXRS_LOW; i++)
vxrs[i] = target->thread.ufpu.vxrs[i].low;
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf, vxrs, 0, -1);
if (rc == 0)
for (i = 0; i < __NUM_VXRS_LOW; i++)
target->thread.ufpu.vxrs[i].low = vxrs[i];
return rc;
}
static int s390_vxrs_high_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_vx())
return -ENODEV;
if (target == current)
save_user_fpu_regs();
return membuf_write(&to, target->thread.ufpu.vxrs + __NUM_VXRS_LOW,
__NUM_VXRS_HIGH * sizeof(__vector128));
}
static int s390_vxrs_high_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int rc;
if (!cpu_has_vx())
return -ENODEV;
if (target == current)
save_user_fpu_regs();
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
target->thread.ufpu.vxrs + __NUM_VXRS_LOW, 0, -1);
return rc;
}
static int s390_system_call_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
return membuf_store(&to, target->thread.system_call);
}
static int s390_system_call_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned int *data = &target->thread.system_call;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(unsigned int));
}
static int s390_gs_cb_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct gs_cb *data = target->thread.gs_cb;
if (!cpu_has_gs())
return -ENODEV;
if (!data)
return -ENODATA;
if (target == current)
save_gs_cb(data);
return membuf_write(&to, data, sizeof(struct gs_cb));
}
static int s390_gs_cb_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct gs_cb gs_cb = { }, *data = NULL;
int rc;
if (!cpu_has_gs())
return -ENODEV;
if (!target->thread.gs_cb) {
data = kzalloc_obj(*data);
if (!data)
return -ENOMEM;
}
if (!target->thread.gs_cb)
gs_cb.gsd = 25;
else if (target == current)
save_gs_cb(&gs_cb);
else
gs_cb = *target->thread.gs_cb;
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&gs_cb, 0, sizeof(gs_cb));
if (rc) {
kfree(data);
return -EFAULT;
}
preempt_disable();
if (!target->thread.gs_cb)
target->thread.gs_cb = data;
*target->thread.gs_cb = gs_cb;
if (target == current) {
local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
restore_gs_cb(target->thread.gs_cb);
}
preempt_enable();
return rc;
}
static int s390_gs_bc_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct gs_cb *data = target->thread.gs_bc_cb;
if (!cpu_has_gs())
return -ENODEV;
if (!data)
return -ENODATA;
return membuf_write(&to, data, sizeof(struct gs_cb));
}
static int s390_gs_bc_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct gs_cb *data = target->thread.gs_bc_cb;
if (!cpu_has_gs())
return -ENODEV;
if (!data) {
data = kzalloc_obj(*data);
if (!data)
return -ENOMEM;
target->thread.gs_bc_cb = data;
}
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
data, 0, sizeof(struct gs_cb));
}
static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
{
return (cb->rca & 0x1f) == 0 &&
(cb->roa & 0xfff) == 0 &&
(cb->rla & 0xfff) == 0xfff &&
cb->s == 1 &&
cb->k == 1 &&
cb->h == 0 &&
cb->reserved1 == 0 &&
cb->ps == 1 &&
cb->qs == 0 &&
cb->pc == 1 &&
cb->qc == 0 &&
cb->reserved2 == 0 &&
cb->reserved3 == 0 &&
cb->reserved4 == 0 &&
cb->reserved5 == 0 &&
cb->reserved6 == 0 &&
cb->reserved7 == 0 &&
cb->reserved8 == 0 &&
cb->rla >= cb->roa &&
cb->rca >= cb->roa &&
cb->rca <= cb->rla+1 &&
cb->m < 3;
}
static int s390_runtime_instr_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
struct runtime_instr_cb *data = target->thread.ri_cb;
if (!test_facility(64))
return -ENODEV;
if (!data)
return -ENODATA;
return membuf_write(&to, data, sizeof(struct runtime_instr_cb));
}
static int s390_runtime_instr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct runtime_instr_cb ri_cb = { }, *data = NULL;
int rc;
if (!test_facility(64))
return -ENODEV;
if (!target->thread.ri_cb) {
data = kzalloc_obj(*data);
if (!data)
return -ENOMEM;
}
if (target->thread.ri_cb) {
if (target == current)
store_runtime_instr_cb(&ri_cb);
else
ri_cb = *target->thread.ri_cb;
}
rc = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&ri_cb, 0, sizeof(struct runtime_instr_cb));
if (rc) {
kfree(data);
return -EFAULT;
}
if (!is_ri_cb_valid(&ri_cb)) {
kfree(data);
return -EINVAL;
}
/*
* Override access key in any case, since user space should
* not be able to set it, nor should it care about it.
*/
ri_cb.key = PAGE_DEFAULT_KEY >> 4;
preempt_disable();
if (!target->thread.ri_cb)
target->thread.ri_cb = data;
*target->thread.ri_cb = ri_cb;
if (target == current)
load_runtime_instr_cb(target->thread.ri_cb);
preempt_enable();
return 0;
}
static const struct user_regset s390_regsets[] = {
{
USER_REGSET_NOTE_TYPE(PRSTATUS),
.n = sizeof(s390_regs) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.regset_get = s390_regs_get,
.set = s390_regs_set,
},
{
USER_REGSET_NOTE_TYPE(PRFPREG),
.n = sizeof(s390_fp_regs) / sizeof(long),
.size = sizeof(long),
.align = sizeof(long),
.regset_get = s390_fpregs_get,
.set = s390_fpregs_set,
},
{
USER_REGSET_NOTE_TYPE(S390_SYSTEM_CALL),
.n = 1,
.size = sizeof(unsigned int),
.align = sizeof(unsigned int),
.regset_get = s390_system_call_get,
.set = s390_system_call_set,
},
{
USER_REGSET_NOTE_TYPE(S390_LAST_BREAK),
.n = 1,
.size = sizeof(long),
.align = sizeof(long),
.regset_get = s390_last_break_get,
.set = s390_last_break_set,
},
{
USER_REGSET_NOTE_TYPE(S390_TDB),
.n = 1,
.size = 256,
.align = 1,
.regset_get = s390_tdb_get,
.set = s390_tdb_set,
},
{
USER_REGSET_NOTE_TYPE(S390_VXRS_LOW),
.n = __NUM_VXRS_LOW,
.size = sizeof(__u64),
.align = sizeof(__u64),
.regset_get = s390_vxrs_low_get,
.set = s390_vxrs_low_set,
},
{
USER_REGSET_NOTE_TYPE(S390_VXRS_HIGH),
.n = __NUM_VXRS_HIGH,
.size = sizeof(__vector128),
.align = sizeof(__vector128),
.regset_get = s390_vxrs_high_get,
.set = s390_vxrs_high_set,
},
{
USER_REGSET_NOTE_TYPE(S390_GS_CB),
.n = sizeof(struct gs_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.regset_get = s390_gs_cb_get,
.set = s390_gs_cb_set,
},
{
USER_REGSET_NOTE_TYPE(S390_GS_BC),
.n = sizeof(struct gs_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.regset_get = s390_gs_bc_get,
.set = s390_gs_bc_set,
},
{
USER_REGSET_NOTE_TYPE(S390_RI_CB),
.n = sizeof(struct runtime_instr_cb) / sizeof(__u64),
.size = sizeof(__u64),
.align = sizeof(__u64),
.regset_get = s390_runtime_instr_get,
.set = s390_runtime_instr_set,
},
};
static const struct user_regset_view user_s390_view = {
.name = "s390x",
.e_machine = EM_S390,
.regsets = s390_regsets,
.n = ARRAY_SIZE(s390_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_s390_view;
}
static const char *gpr_names[NUM_GPRS] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
};
int regs_query_register_offset(const char *name)
{
unsigned long offset;
if (!name || *name != 'r')
return -EINVAL;
if (kstrtoul(name + 1, 10, &offset))
return -EINVAL;
if (offset >= NUM_GPRS)
return -EINVAL;
return offset;
}
const char *regs_query_register_name(unsigned int offset)
{
if (offset >= NUM_GPRS)
return NULL;
return gpr_names[offset];
}
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