1139 lines
25 KiB
C
1139 lines
25 KiB
C
/*
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* Based on arch/arm/kernel/ptrace.c
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*
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* By Ross Biro 1/23/92
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* edited by Linus Torvalds
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* ARM modifications Copyright (C) 2000 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/audit.h>
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#include <linux/compat.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/security.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <linux/uaccess.h>
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#include <linux/perf_event.h>
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#include <linux/hw_breakpoint.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <asm/compat.h>
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#include <asm/debug-monitors.h>
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#include <asm/pgtable.h>
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#include <asm/syscall.h>
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#include <asm/traps.h>
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#include <asm/system_misc.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/*
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* TODO: does not yet catch signals sent when the child dies.
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* in exit.c or in signal.c.
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*/
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/*
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* Called by kernel/ptrace.c when detaching..
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*/
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void ptrace_disable(struct task_struct *child)
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{
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}
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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/*
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* Handle hitting a HW-breakpoint.
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*/
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static void ptrace_hbptriggered(struct perf_event *bp,
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struct perf_sample_data *data,
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struct pt_regs *regs)
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{
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struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
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siginfo_t info = {
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.si_signo = SIGTRAP,
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.si_errno = 0,
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.si_code = TRAP_HWBKPT,
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.si_addr = (void __user *)(bkpt->trigger),
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};
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#ifdef CONFIG_COMPAT
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int i;
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if (!is_compat_task())
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goto send_sig;
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for (i = 0; i < ARM_MAX_BRP; ++i) {
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if (current->thread.debug.hbp_break[i] == bp) {
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info.si_errno = (i << 1) + 1;
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break;
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}
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}
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for (i = 0; i < ARM_MAX_WRP; ++i) {
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if (current->thread.debug.hbp_watch[i] == bp) {
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info.si_errno = -((i << 1) + 1);
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break;
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}
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}
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send_sig:
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#endif
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force_sig_info(SIGTRAP, &info, current);
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}
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/*
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* Unregister breakpoints from this task and reset the pointers in
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* the thread_struct.
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*/
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void flush_ptrace_hw_breakpoint(struct task_struct *tsk)
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{
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int i;
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struct thread_struct *t = &tsk->thread;
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for (i = 0; i < ARM_MAX_BRP; i++) {
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if (t->debug.hbp_break[i]) {
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unregister_hw_breakpoint(t->debug.hbp_break[i]);
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t->debug.hbp_break[i] = NULL;
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}
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}
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for (i = 0; i < ARM_MAX_WRP; i++) {
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if (t->debug.hbp_watch[i]) {
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unregister_hw_breakpoint(t->debug.hbp_watch[i]);
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t->debug.hbp_watch[i] = NULL;
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}
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}
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}
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void ptrace_hw_copy_thread(struct task_struct *tsk)
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{
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memset(&tsk->thread.debug, 0, sizeof(struct debug_info));
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}
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static struct perf_event *ptrace_hbp_get_event(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx)
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{
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struct perf_event *bp = ERR_PTR(-EINVAL);
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switch (note_type) {
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case NT_ARM_HW_BREAK:
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if (idx < ARM_MAX_BRP)
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bp = tsk->thread.debug.hbp_break[idx];
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break;
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case NT_ARM_HW_WATCH:
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if (idx < ARM_MAX_WRP)
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bp = tsk->thread.debug.hbp_watch[idx];
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break;
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}
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return bp;
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}
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static int ptrace_hbp_set_event(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx,
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struct perf_event *bp)
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{
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int err = -EINVAL;
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switch (note_type) {
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case NT_ARM_HW_BREAK:
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if (idx < ARM_MAX_BRP) {
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tsk->thread.debug.hbp_break[idx] = bp;
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err = 0;
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}
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break;
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case NT_ARM_HW_WATCH:
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if (idx < ARM_MAX_WRP) {
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tsk->thread.debug.hbp_watch[idx] = bp;
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err = 0;
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}
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break;
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}
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return err;
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}
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static struct perf_event *ptrace_hbp_create(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx)
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{
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struct perf_event *bp;
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struct perf_event_attr attr;
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int err, type;
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switch (note_type) {
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case NT_ARM_HW_BREAK:
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type = HW_BREAKPOINT_X;
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break;
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case NT_ARM_HW_WATCH:
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type = HW_BREAKPOINT_RW;
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break;
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default:
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return ERR_PTR(-EINVAL);
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}
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ptrace_breakpoint_init(&attr);
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/*
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* Initialise fields to sane defaults
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* (i.e. values that will pass validation).
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*/
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attr.bp_addr = 0;
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attr.bp_len = HW_BREAKPOINT_LEN_4;
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attr.bp_type = type;
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attr.disabled = 1;
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bp = register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, tsk);
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if (IS_ERR(bp))
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return bp;
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err = ptrace_hbp_set_event(note_type, tsk, idx, bp);
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if (err)
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return ERR_PTR(err);
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return bp;
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}
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static int ptrace_hbp_fill_attr_ctrl(unsigned int note_type,
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struct arch_hw_breakpoint_ctrl ctrl,
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struct perf_event_attr *attr)
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{
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int err, len, type, disabled = !ctrl.enabled;
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attr->disabled = disabled;
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if (disabled)
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return 0;
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err = arch_bp_generic_fields(ctrl, &len, &type);
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if (err)
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return err;
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switch (note_type) {
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case NT_ARM_HW_BREAK:
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if ((type & HW_BREAKPOINT_X) != type)
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return -EINVAL;
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break;
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case NT_ARM_HW_WATCH:
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if ((type & HW_BREAKPOINT_RW) != type)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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attr->bp_len = len;
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attr->bp_type = type;
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return 0;
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}
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static int ptrace_hbp_get_resource_info(unsigned int note_type, u32 *info)
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{
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u8 num;
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u32 reg = 0;
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switch (note_type) {
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case NT_ARM_HW_BREAK:
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num = hw_breakpoint_slots(TYPE_INST);
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break;
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case NT_ARM_HW_WATCH:
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num = hw_breakpoint_slots(TYPE_DATA);
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break;
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default:
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return -EINVAL;
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}
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reg |= debug_monitors_arch();
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reg <<= 8;
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reg |= num;
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*info = reg;
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return 0;
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}
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static int ptrace_hbp_get_ctrl(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx,
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u32 *ctrl)
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{
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struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
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if (IS_ERR(bp))
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return PTR_ERR(bp);
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*ctrl = bp ? encode_ctrl_reg(counter_arch_bp(bp)->ctrl) : 0;
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return 0;
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}
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static int ptrace_hbp_get_addr(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx,
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u64 *addr)
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{
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struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
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if (IS_ERR(bp))
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return PTR_ERR(bp);
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*addr = bp ? bp->attr.bp_addr : 0;
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return 0;
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}
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static struct perf_event *ptrace_hbp_get_initialised_bp(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx)
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{
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struct perf_event *bp = ptrace_hbp_get_event(note_type, tsk, idx);
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if (!bp)
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bp = ptrace_hbp_create(note_type, tsk, idx);
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return bp;
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}
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static int ptrace_hbp_set_ctrl(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx,
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u32 uctrl)
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{
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int err;
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struct perf_event *bp;
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struct perf_event_attr attr;
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struct arch_hw_breakpoint_ctrl ctrl;
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bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
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if (IS_ERR(bp)) {
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err = PTR_ERR(bp);
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return err;
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}
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attr = bp->attr;
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decode_ctrl_reg(uctrl, &ctrl);
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err = ptrace_hbp_fill_attr_ctrl(note_type, ctrl, &attr);
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if (err)
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return err;
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return modify_user_hw_breakpoint(bp, &attr);
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}
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static int ptrace_hbp_set_addr(unsigned int note_type,
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struct task_struct *tsk,
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unsigned long idx,
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u64 addr)
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{
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int err;
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struct perf_event *bp;
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struct perf_event_attr attr;
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bp = ptrace_hbp_get_initialised_bp(note_type, tsk, idx);
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if (IS_ERR(bp)) {
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err = PTR_ERR(bp);
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return err;
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}
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attr = bp->attr;
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attr.bp_addr = addr;
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err = modify_user_hw_breakpoint(bp, &attr);
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return err;
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}
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#define PTRACE_HBP_ADDR_SZ sizeof(u64)
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#define PTRACE_HBP_CTRL_SZ sizeof(u32)
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#define PTRACE_HBP_PAD_SZ sizeof(u32)
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static int hw_break_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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unsigned int note_type = regset->core_note_type;
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int ret, idx = 0, offset, limit;
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u32 info, ctrl;
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u64 addr;
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/* Resource info */
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ret = ptrace_hbp_get_resource_info(note_type, &info);
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if (ret)
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return ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &info, 0,
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sizeof(info));
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if (ret)
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return ret;
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/* Pad */
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offset = offsetof(struct user_hwdebug_state, pad);
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, offset,
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offset + PTRACE_HBP_PAD_SZ);
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if (ret)
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return ret;
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/* (address, ctrl) registers */
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offset = offsetof(struct user_hwdebug_state, dbg_regs);
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limit = regset->n * regset->size;
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while (count && offset < limit) {
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ret = ptrace_hbp_get_addr(note_type, target, idx, &addr);
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if (ret)
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return ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &addr,
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offset, offset + PTRACE_HBP_ADDR_SZ);
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if (ret)
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return ret;
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offset += PTRACE_HBP_ADDR_SZ;
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ret = ptrace_hbp_get_ctrl(note_type, target, idx, &ctrl);
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if (ret)
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return ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &ctrl,
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offset, offset + PTRACE_HBP_CTRL_SZ);
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if (ret)
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return ret;
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offset += PTRACE_HBP_CTRL_SZ;
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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offset,
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offset + PTRACE_HBP_PAD_SZ);
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if (ret)
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return ret;
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offset += PTRACE_HBP_PAD_SZ;
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idx++;
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}
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return 0;
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}
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static int hw_break_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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unsigned int note_type = regset->core_note_type;
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int ret, idx = 0, offset, limit;
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u32 ctrl;
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u64 addr;
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/* Resource info and pad */
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offset = offsetof(struct user_hwdebug_state, dbg_regs);
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, offset);
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if (ret)
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return ret;
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/* (address, ctrl) registers */
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limit = regset->n * regset->size;
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while (count && offset < limit) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &addr,
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offset, offset + PTRACE_HBP_ADDR_SZ);
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if (ret)
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return ret;
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ret = ptrace_hbp_set_addr(note_type, target, idx, addr);
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if (ret)
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return ret;
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offset += PTRACE_HBP_ADDR_SZ;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl,
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offset, offset + PTRACE_HBP_CTRL_SZ);
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if (ret)
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return ret;
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ret = ptrace_hbp_set_ctrl(note_type, target, idx, ctrl);
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if (ret)
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return ret;
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offset += PTRACE_HBP_CTRL_SZ;
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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offset,
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offset + PTRACE_HBP_PAD_SZ);
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if (ret)
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return ret;
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offset += PTRACE_HBP_PAD_SZ;
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idx++;
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}
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return 0;
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}
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#endif /* CONFIG_HAVE_HW_BREAKPOINT */
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|
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static int gpr_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
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}
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static int gpr_set(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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int ret;
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struct user_pt_regs newregs;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
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if (ret)
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return ret;
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if (!valid_user_regs(&newregs))
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return -EINVAL;
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task_pt_regs(target)->user_regs = newregs;
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return 0;
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}
|
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|
|
/*
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* TODO: update fp accessors for lazy context switching (sync/flush hwstate)
|
|
*/
|
|
static int fpr_get(struct task_struct *target, const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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struct user_fpsimd_state *uregs;
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uregs = &target->thread.fpsimd_state.user_fpsimd;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1);
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}
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|
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static int fpr_set(struct task_struct *target, const struct user_regset *regset,
|
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unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
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{
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int ret;
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struct user_fpsimd_state newstate;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newstate, 0, -1);
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if (ret)
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return ret;
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target->thread.fpsimd_state.user_fpsimd = newstate;
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fpsimd_flush_task_state(target);
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return ret;
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}
|
|
|
|
static int tls_get(struct task_struct *target, const struct user_regset *regset,
|
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unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
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unsigned long *tls = &target->thread.tp_value;
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, tls, 0, -1);
|
|
}
|
|
|
|
static int tls_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;
|
|
unsigned long tls;
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &tls, 0, -1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
target->thread.tp_value = tls;
|
|
return ret;
|
|
}
|
|
|
|
enum aarch64_regset {
|
|
REGSET_GPR,
|
|
REGSET_FPR,
|
|
REGSET_TLS,
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
REGSET_HW_BREAK,
|
|
REGSET_HW_WATCH,
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset aarch64_regsets[] = {
|
|
[REGSET_GPR] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = sizeof(struct user_pt_regs) / sizeof(u64),
|
|
.size = sizeof(u64),
|
|
.align = sizeof(u64),
|
|
.get = gpr_get,
|
|
.set = gpr_set
|
|
},
|
|
[REGSET_FPR] = {
|
|
.core_note_type = NT_PRFPREG,
|
|
.n = sizeof(struct user_fpsimd_state) / sizeof(u32),
|
|
/*
|
|
* We pretend we have 32-bit registers because the fpsr and
|
|
* fpcr are 32-bits wide.
|
|
*/
|
|
.size = sizeof(u32),
|
|
.align = sizeof(u32),
|
|
.get = fpr_get,
|
|
.set = fpr_set
|
|
},
|
|
[REGSET_TLS] = {
|
|
.core_note_type = NT_ARM_TLS,
|
|
.n = 1,
|
|
.size = sizeof(void *),
|
|
.align = sizeof(void *),
|
|
.get = tls_get,
|
|
.set = tls_set,
|
|
},
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
[REGSET_HW_BREAK] = {
|
|
.core_note_type = NT_ARM_HW_BREAK,
|
|
.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
|
|
.size = sizeof(u32),
|
|
.align = sizeof(u32),
|
|
.get = hw_break_get,
|
|
.set = hw_break_set,
|
|
},
|
|
[REGSET_HW_WATCH] = {
|
|
.core_note_type = NT_ARM_HW_WATCH,
|
|
.n = sizeof(struct user_hwdebug_state) / sizeof(u32),
|
|
.size = sizeof(u32),
|
|
.align = sizeof(u32),
|
|
.get = hw_break_get,
|
|
.set = hw_break_set,
|
|
},
|
|
#endif
|
|
};
|
|
|
|
static const struct user_regset_view user_aarch64_view = {
|
|
.name = "aarch64", .e_machine = EM_AARCH64,
|
|
.regsets = aarch64_regsets, .n = ARRAY_SIZE(aarch64_regsets)
|
|
};
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
#include <linux/compat.h>
|
|
|
|
enum compat_regset {
|
|
REGSET_COMPAT_GPR,
|
|
REGSET_COMPAT_VFP,
|
|
};
|
|
|
|
static int compat_gpr_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
int ret = 0;
|
|
unsigned int i, start, num_regs;
|
|
|
|
/* Calculate the number of AArch32 registers contained in count */
|
|
num_regs = count / regset->size;
|
|
|
|
/* Convert pos into an register number */
|
|
start = pos / regset->size;
|
|
|
|
if (start + num_regs > regset->n)
|
|
return -EIO;
|
|
|
|
for (i = 0; i < num_regs; ++i) {
|
|
unsigned int idx = start + i;
|
|
compat_ulong_t reg;
|
|
|
|
switch (idx) {
|
|
case 15:
|
|
reg = task_pt_regs(target)->pc;
|
|
break;
|
|
case 16:
|
|
reg = task_pt_regs(target)->pstate;
|
|
break;
|
|
case 17:
|
|
reg = task_pt_regs(target)->orig_x0;
|
|
break;
|
|
default:
|
|
reg = task_pt_regs(target)->regs[idx];
|
|
}
|
|
|
|
if (kbuf) {
|
|
memcpy(kbuf, ®, sizeof(reg));
|
|
kbuf += sizeof(reg);
|
|
} else {
|
|
ret = copy_to_user(ubuf, ®, sizeof(reg));
|
|
if (ret) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
ubuf += sizeof(reg);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int compat_gpr_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 newregs;
|
|
int ret = 0;
|
|
unsigned int i, start, num_regs;
|
|
|
|
/* Calculate the number of AArch32 registers contained in count */
|
|
num_regs = count / regset->size;
|
|
|
|
/* Convert pos into an register number */
|
|
start = pos / regset->size;
|
|
|
|
if (start + num_regs > regset->n)
|
|
return -EIO;
|
|
|
|
newregs = *task_pt_regs(target);
|
|
|
|
for (i = 0; i < num_regs; ++i) {
|
|
unsigned int idx = start + i;
|
|
compat_ulong_t reg;
|
|
|
|
if (kbuf) {
|
|
memcpy(®, kbuf, sizeof(reg));
|
|
kbuf += sizeof(reg);
|
|
} else {
|
|
ret = copy_from_user(®, ubuf, sizeof(reg));
|
|
if (ret) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
ubuf += sizeof(reg);
|
|
}
|
|
|
|
switch (idx) {
|
|
case 15:
|
|
newregs.pc = reg;
|
|
break;
|
|
case 16:
|
|
newregs.pstate = reg;
|
|
break;
|
|
case 17:
|
|
newregs.orig_x0 = reg;
|
|
break;
|
|
default:
|
|
newregs.regs[idx] = reg;
|
|
}
|
|
|
|
}
|
|
|
|
if (valid_user_regs(&newregs.user_regs))
|
|
*task_pt_regs(target) = newregs;
|
|
else
|
|
ret = -EINVAL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int compat_vfp_get(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
void *kbuf, void __user *ubuf)
|
|
{
|
|
struct user_fpsimd_state *uregs;
|
|
compat_ulong_t fpscr;
|
|
int ret;
|
|
|
|
uregs = &target->thread.fpsimd_state.user_fpsimd;
|
|
|
|
/*
|
|
* The VFP registers are packed into the fpsimd_state, so they all sit
|
|
* nicely together for us. We just need to create the fpscr separately.
|
|
*/
|
|
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0,
|
|
VFP_STATE_SIZE - sizeof(compat_ulong_t));
|
|
|
|
if (count && !ret) {
|
|
fpscr = (uregs->fpsr & VFP_FPSCR_STAT_MASK) |
|
|
(uregs->fpcr & VFP_FPSCR_CTRL_MASK);
|
|
ret = put_user(fpscr, (compat_ulong_t *)ubuf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int compat_vfp_set(struct task_struct *target,
|
|
const struct user_regset *regset,
|
|
unsigned int pos, unsigned int count,
|
|
const void *kbuf, const void __user *ubuf)
|
|
{
|
|
struct user_fpsimd_state *uregs;
|
|
compat_ulong_t fpscr;
|
|
int ret;
|
|
|
|
if (pos + count > VFP_STATE_SIZE)
|
|
return -EIO;
|
|
|
|
uregs = &target->thread.fpsimd_state.user_fpsimd;
|
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, uregs, 0,
|
|
VFP_STATE_SIZE - sizeof(compat_ulong_t));
|
|
|
|
if (count && !ret) {
|
|
ret = get_user(fpscr, (compat_ulong_t *)ubuf);
|
|
uregs->fpsr = fpscr & VFP_FPSCR_STAT_MASK;
|
|
uregs->fpcr = fpscr & VFP_FPSCR_CTRL_MASK;
|
|
}
|
|
|
|
fpsimd_flush_task_state(target);
|
|
return ret;
|
|
}
|
|
|
|
static const struct user_regset aarch32_regsets[] = {
|
|
[REGSET_COMPAT_GPR] = {
|
|
.core_note_type = NT_PRSTATUS,
|
|
.n = COMPAT_ELF_NGREG,
|
|
.size = sizeof(compat_elf_greg_t),
|
|
.align = sizeof(compat_elf_greg_t),
|
|
.get = compat_gpr_get,
|
|
.set = compat_gpr_set
|
|
},
|
|
[REGSET_COMPAT_VFP] = {
|
|
.core_note_type = NT_ARM_VFP,
|
|
.n = VFP_STATE_SIZE / sizeof(compat_ulong_t),
|
|
.size = sizeof(compat_ulong_t),
|
|
.align = sizeof(compat_ulong_t),
|
|
.get = compat_vfp_get,
|
|
.set = compat_vfp_set
|
|
},
|
|
};
|
|
|
|
static const struct user_regset_view user_aarch32_view = {
|
|
.name = "aarch32", .e_machine = EM_ARM,
|
|
.regsets = aarch32_regsets, .n = ARRAY_SIZE(aarch32_regsets)
|
|
};
|
|
|
|
static int compat_ptrace_read_user(struct task_struct *tsk, compat_ulong_t off,
|
|
compat_ulong_t __user *ret)
|
|
{
|
|
compat_ulong_t tmp;
|
|
|
|
if (off & 3)
|
|
return -EIO;
|
|
|
|
if (off == COMPAT_PT_TEXT_ADDR)
|
|
tmp = tsk->mm->start_code;
|
|
else if (off == COMPAT_PT_DATA_ADDR)
|
|
tmp = tsk->mm->start_data;
|
|
else if (off == COMPAT_PT_TEXT_END_ADDR)
|
|
tmp = tsk->mm->end_code;
|
|
else if (off < sizeof(compat_elf_gregset_t))
|
|
return copy_regset_to_user(tsk, &user_aarch32_view,
|
|
REGSET_COMPAT_GPR, off,
|
|
sizeof(compat_ulong_t), ret);
|
|
else if (off >= COMPAT_USER_SZ)
|
|
return -EIO;
|
|
else
|
|
tmp = 0;
|
|
|
|
return put_user(tmp, ret);
|
|
}
|
|
|
|
static int compat_ptrace_write_user(struct task_struct *tsk, compat_ulong_t off,
|
|
compat_ulong_t val)
|
|
{
|
|
int ret;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
if (off & 3 || off >= COMPAT_USER_SZ)
|
|
return -EIO;
|
|
|
|
if (off >= sizeof(compat_elf_gregset_t))
|
|
return 0;
|
|
|
|
set_fs(KERNEL_DS);
|
|
ret = copy_regset_from_user(tsk, &user_aarch32_view,
|
|
REGSET_COMPAT_GPR, off,
|
|
sizeof(compat_ulong_t),
|
|
&val);
|
|
set_fs(old_fs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
|
|
/*
|
|
* Convert a virtual register number into an index for a thread_info
|
|
* breakpoint array. Breakpoints are identified using positive numbers
|
|
* whilst watchpoints are negative. The registers are laid out as pairs
|
|
* of (address, control), each pair mapping to a unique hw_breakpoint struct.
|
|
* Register 0 is reserved for describing resource information.
|
|
*/
|
|
static int compat_ptrace_hbp_num_to_idx(compat_long_t num)
|
|
{
|
|
return (abs(num) - 1) >> 1;
|
|
}
|
|
|
|
static int compat_ptrace_hbp_get_resource_info(u32 *kdata)
|
|
{
|
|
u8 num_brps, num_wrps, debug_arch, wp_len;
|
|
u32 reg = 0;
|
|
|
|
num_brps = hw_breakpoint_slots(TYPE_INST);
|
|
num_wrps = hw_breakpoint_slots(TYPE_DATA);
|
|
|
|
debug_arch = debug_monitors_arch();
|
|
wp_len = 8;
|
|
reg |= debug_arch;
|
|
reg <<= 8;
|
|
reg |= wp_len;
|
|
reg <<= 8;
|
|
reg |= num_wrps;
|
|
reg <<= 8;
|
|
reg |= num_brps;
|
|
|
|
*kdata = reg;
|
|
return 0;
|
|
}
|
|
|
|
static int compat_ptrace_hbp_get(unsigned int note_type,
|
|
struct task_struct *tsk,
|
|
compat_long_t num,
|
|
u32 *kdata)
|
|
{
|
|
u64 addr = 0;
|
|
u32 ctrl = 0;
|
|
|
|
int err, idx = compat_ptrace_hbp_num_to_idx(num);;
|
|
|
|
if (num & 1) {
|
|
err = ptrace_hbp_get_addr(note_type, tsk, idx, &addr);
|
|
*kdata = (u32)addr;
|
|
} else {
|
|
err = ptrace_hbp_get_ctrl(note_type, tsk, idx, &ctrl);
|
|
*kdata = ctrl;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int compat_ptrace_hbp_set(unsigned int note_type,
|
|
struct task_struct *tsk,
|
|
compat_long_t num,
|
|
u32 *kdata)
|
|
{
|
|
u64 addr;
|
|
u32 ctrl;
|
|
|
|
int err, idx = compat_ptrace_hbp_num_to_idx(num);
|
|
|
|
if (num & 1) {
|
|
addr = *kdata;
|
|
err = ptrace_hbp_set_addr(note_type, tsk, idx, addr);
|
|
} else {
|
|
ctrl = *kdata;
|
|
err = ptrace_hbp_set_ctrl(note_type, tsk, idx, ctrl);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int compat_ptrace_gethbpregs(struct task_struct *tsk, compat_long_t num,
|
|
compat_ulong_t __user *data)
|
|
{
|
|
int ret;
|
|
u32 kdata;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
set_fs(KERNEL_DS);
|
|
/* Watchpoint */
|
|
if (num < 0) {
|
|
ret = compat_ptrace_hbp_get(NT_ARM_HW_WATCH, tsk, num, &kdata);
|
|
/* Resource info */
|
|
} else if (num == 0) {
|
|
ret = compat_ptrace_hbp_get_resource_info(&kdata);
|
|
/* Breakpoint */
|
|
} else {
|
|
ret = compat_ptrace_hbp_get(NT_ARM_HW_BREAK, tsk, num, &kdata);
|
|
}
|
|
set_fs(old_fs);
|
|
|
|
if (!ret)
|
|
ret = put_user(kdata, data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int compat_ptrace_sethbpregs(struct task_struct *tsk, compat_long_t num,
|
|
compat_ulong_t __user *data)
|
|
{
|
|
int ret;
|
|
u32 kdata = 0;
|
|
mm_segment_t old_fs = get_fs();
|
|
|
|
if (num == 0)
|
|
return 0;
|
|
|
|
ret = get_user(kdata, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
set_fs(KERNEL_DS);
|
|
if (num < 0)
|
|
ret = compat_ptrace_hbp_set(NT_ARM_HW_WATCH, tsk, num, &kdata);
|
|
else
|
|
ret = compat_ptrace_hbp_set(NT_ARM_HW_BREAK, tsk, num, &kdata);
|
|
set_fs(old_fs);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_HAVE_HW_BREAKPOINT */
|
|
|
|
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;
|
|
void __user *datap = compat_ptr(data);
|
|
int ret;
|
|
|
|
switch (request) {
|
|
case PTRACE_PEEKUSR:
|
|
ret = compat_ptrace_read_user(child, addr, datap);
|
|
break;
|
|
|
|
case PTRACE_POKEUSR:
|
|
ret = compat_ptrace_write_user(child, addr, data);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_GETREGS:
|
|
ret = copy_regset_to_user(child,
|
|
&user_aarch32_view,
|
|
REGSET_COMPAT_GPR,
|
|
0, sizeof(compat_elf_gregset_t),
|
|
datap);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_SETREGS:
|
|
ret = copy_regset_from_user(child,
|
|
&user_aarch32_view,
|
|
REGSET_COMPAT_GPR,
|
|
0, sizeof(compat_elf_gregset_t),
|
|
datap);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_GET_THREAD_AREA:
|
|
ret = put_user((compat_ulong_t)child->thread.tp_value,
|
|
(compat_ulong_t __user *)datap);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_SET_SYSCALL:
|
|
task_pt_regs(child)->syscallno = data;
|
|
ret = 0;
|
|
break;
|
|
|
|
case COMPAT_PTRACE_GETVFPREGS:
|
|
ret = copy_regset_to_user(child,
|
|
&user_aarch32_view,
|
|
REGSET_COMPAT_VFP,
|
|
0, VFP_STATE_SIZE,
|
|
datap);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_SETVFPREGS:
|
|
ret = copy_regset_from_user(child,
|
|
&user_aarch32_view,
|
|
REGSET_COMPAT_VFP,
|
|
0, VFP_STATE_SIZE,
|
|
datap);
|
|
break;
|
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
case COMPAT_PTRACE_GETHBPREGS:
|
|
ret = compat_ptrace_gethbpregs(child, addr, datap);
|
|
break;
|
|
|
|
case COMPAT_PTRACE_SETHBPREGS:
|
|
ret = compat_ptrace_sethbpregs(child, addr, datap);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret = compat_ptrace_request(child, request, addr,
|
|
data);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (is_compat_thread(task_thread_info(task)))
|
|
return &user_aarch32_view;
|
|
#endif
|
|
return &user_aarch64_view;
|
|
}
|
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
unsigned long addr, unsigned long data)
|
|
{
|
|
return ptrace_request(child, request, addr, data);
|
|
}
|
|
|
|
enum ptrace_syscall_dir {
|
|
PTRACE_SYSCALL_ENTER = 0,
|
|
PTRACE_SYSCALL_EXIT,
|
|
};
|
|
|
|
static void tracehook_report_syscall(struct pt_regs *regs,
|
|
enum ptrace_syscall_dir dir)
|
|
{
|
|
int regno;
|
|
unsigned long saved_reg;
|
|
|
|
/*
|
|
* A scratch register (ip(r12) on AArch32, x7 on AArch64) is
|
|
* used to denote syscall entry/exit:
|
|
*/
|
|
regno = (is_compat_task() ? 12 : 7);
|
|
saved_reg = regs->regs[regno];
|
|
regs->regs[regno] = dir;
|
|
|
|
if (dir == PTRACE_SYSCALL_EXIT)
|
|
tracehook_report_syscall_exit(regs, 0);
|
|
else if (tracehook_report_syscall_entry(regs))
|
|
regs->syscallno = ~0UL;
|
|
|
|
regs->regs[regno] = saved_reg;
|
|
}
|
|
|
|
asmlinkage int syscall_trace_enter(struct pt_regs *regs)
|
|
{
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
|
trace_sys_enter(regs, regs->syscallno);
|
|
|
|
audit_syscall_entry(syscall_get_arch(), regs->syscallno,
|
|
regs->orig_x0, regs->regs[1], regs->regs[2], regs->regs[3]);
|
|
|
|
return regs->syscallno;
|
|
}
|
|
|
|
asmlinkage void syscall_trace_exit(struct pt_regs *regs)
|
|
{
|
|
audit_syscall_exit(regs);
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
|
trace_sys_exit(regs, regs_return_value(regs));
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
|
|
}
|