mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 17:16:41 +07:00
9c1a125921
The Blackfin/FRV/SuperH guys all have the same exact FDPIC ptrace code in their arch handlers (since they were probably copied & pasted). Since these ptrace interfaces are an arch independent aspect of the FDPIC code, unify them in the common ptrace code so new FDPIC ports don't need to copy and paste this fundamental stuff yet again. Signed-off-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Roland McGrath <roland@redhat.com> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Cc: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
499 lines
12 KiB
C
499 lines
12 KiB
C
/*
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* SuperH process tracing
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*
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* Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
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* Copyright (C) 2002 - 2009 Paul Mundt
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*
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* Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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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/errno.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/signal.h>
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#include <linux/io.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/regset.h>
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#include <linux/hw_breakpoint.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/syscalls.h>
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#include <asm/fpu.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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* This routine will get a word off of the process kernel stack.
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*/
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static inline int get_stack_long(struct task_struct *task, int offset)
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{
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unsigned char *stack;
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stack = (unsigned char *)task_pt_regs(task);
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stack += offset;
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return (*((int *)stack));
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}
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/*
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* This routine will put a word on the process kernel stack.
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*/
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static inline int put_stack_long(struct task_struct *task, int offset,
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unsigned long data)
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{
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unsigned char *stack;
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stack = (unsigned char *)task_pt_regs(task);
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stack += offset;
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*(unsigned long *) stack = data;
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return 0;
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}
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void ptrace_triggered(struct perf_event *bp, int nmi,
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struct perf_sample_data *data, struct pt_regs *regs)
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{
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struct perf_event_attr attr;
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/*
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* Disable the breakpoint request here since ptrace has defined a
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* one-shot behaviour for breakpoint exceptions.
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*/
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attr = bp->attr;
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attr.disabled = true;
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modify_user_hw_breakpoint(bp, &attr);
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}
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static int set_single_step(struct task_struct *tsk, unsigned long addr)
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{
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struct thread_struct *thread = &tsk->thread;
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struct perf_event *bp;
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struct perf_event_attr attr;
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bp = thread->ptrace_bps[0];
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if (!bp) {
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ptrace_breakpoint_init(&attr);
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attr.bp_addr = addr;
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attr.bp_len = HW_BREAKPOINT_LEN_2;
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attr.bp_type = HW_BREAKPOINT_R;
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bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
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if (IS_ERR(bp))
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return PTR_ERR(bp);
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thread->ptrace_bps[0] = bp;
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} else {
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int err;
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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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if (unlikely(err))
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return err;
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}
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return 0;
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}
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void user_enable_single_step(struct task_struct *child)
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{
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unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
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set_tsk_thread_flag(child, TIF_SINGLESTEP);
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set_single_step(child, pc);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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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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* Make sure single step bits etc are not set.
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*/
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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static int genregs_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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const struct pt_regs *regs = task_pt_regs(target);
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int ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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0, 16 * sizeof(unsigned long));
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if (!ret)
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/* PC, PR, SR, GBR, MACH, MACL, TRA */
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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offsetof(struct pt_regs, pc),
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sizeof(struct pt_regs));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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static int genregs_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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struct pt_regs *regs = task_pt_regs(target);
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int ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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regs->regs,
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0, 16 * sizeof(unsigned long));
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if (!ret && count > 0)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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®s->pc,
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offsetof(struct pt_regs, pc),
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sizeof(struct pt_regs));
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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#ifdef CONFIG_SH_FPU
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int fpregs_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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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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if ((boot_cpu_data.flags & CPU_HAS_FPU))
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->hardfpu, 0, -1);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->softfpu, 0, -1);
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}
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static int fpregs_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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int ret;
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ret = init_fpu(target);
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if (ret)
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return ret;
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set_stopped_child_used_math(target);
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if ((boot_cpu_data.flags & CPU_HAS_FPU))
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->hardfpu, 0, -1);
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return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.xstate->softfpu, 0, -1);
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}
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static int fpregs_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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return tsk_used_math(target) ? regset->n : 0;
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}
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#endif
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#ifdef CONFIG_SH_DSP
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static int dspregs_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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const struct pt_dspregs *regs =
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(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
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int ret;
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
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0, sizeof(struct pt_dspregs));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_dspregs), -1);
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return ret;
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}
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static int dspregs_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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struct pt_dspregs *regs =
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(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
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int ret;
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
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0, sizeof(struct pt_dspregs));
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if (!ret)
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ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_dspregs), -1);
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return ret;
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}
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static int dspregs_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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struct pt_regs *regs = task_pt_regs(target);
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return regs->sr & SR_DSP ? regset->n : 0;
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}
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#endif
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/*
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* These are our native regset flavours.
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*/
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enum sh_regset {
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REGSET_GENERAL,
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#ifdef CONFIG_SH_FPU
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REGSET_FPU,
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#endif
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#ifdef CONFIG_SH_DSP
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REGSET_DSP,
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#endif
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};
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static const struct user_regset sh_regsets[] = {
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/*
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* Format is:
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* R0 --> R15
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* PC, PR, SR, GBR, MACH, MACL, TRA
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*/
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[REGSET_GENERAL] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(long),
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.align = sizeof(long),
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.get = genregs_get,
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.set = genregs_set,
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},
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#ifdef CONFIG_SH_FPU
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[REGSET_FPU] = {
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.core_note_type = NT_PRFPREG,
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.n = sizeof(struct user_fpu_struct) / sizeof(long),
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.size = sizeof(long),
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.align = sizeof(long),
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.get = fpregs_get,
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.set = fpregs_set,
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.active = fpregs_active,
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},
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#endif
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#ifdef CONFIG_SH_DSP
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[REGSET_DSP] = {
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.n = sizeof(struct pt_dspregs) / sizeof(long),
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.size = sizeof(long),
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.align = sizeof(long),
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.get = dspregs_get,
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.set = dspregs_set,
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.active = dspregs_active,
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},
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#endif
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};
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static const struct user_regset_view user_sh_native_view = {
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.name = "sh",
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.e_machine = EM_SH,
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.regsets = sh_regsets,
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.n = ARRAY_SIZE(sh_regsets),
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};
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const struct user_regset_view *task_user_regset_view(struct task_struct *task)
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{
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return &user_sh_native_view;
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}
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long arch_ptrace(struct task_struct *child, long request, long addr, long data)
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{
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struct user * dummy = NULL;
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unsigned long __user *datap = (unsigned long __user *)data;
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int ret;
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switch (request) {
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/* read the word at location addr in the USER area. */
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case PTRACE_PEEKUSR: {
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unsigned long tmp;
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ret = -EIO;
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if ((addr & 3) || addr < 0 ||
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addr > sizeof(struct user) - 3)
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break;
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if (addr < sizeof(struct pt_regs))
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tmp = get_stack_long(child, addr);
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else if (addr >= (long) &dummy->fpu &&
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addr < (long) &dummy->u_fpvalid) {
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if (!tsk_used_math(child)) {
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if (addr == (long)&dummy->fpu.fpscr)
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tmp = FPSCR_INIT;
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else
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tmp = 0;
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} else
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tmp = ((long *)child->thread.xstate)
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[(addr - (long)&dummy->fpu) >> 2];
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} else if (addr == (long) &dummy->u_fpvalid)
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tmp = !!tsk_used_math(child);
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else if (addr == PT_TEXT_ADDR)
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tmp = child->mm->start_code;
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else if (addr == PT_DATA_ADDR)
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tmp = child->mm->start_data;
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else if (addr == PT_TEXT_END_ADDR)
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tmp = child->mm->end_code;
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else if (addr == PT_TEXT_LEN)
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tmp = child->mm->end_code - child->mm->start_code;
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else
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tmp = 0;
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ret = put_user(tmp, datap);
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break;
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}
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case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
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ret = -EIO;
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if ((addr & 3) || addr < 0 ||
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addr > sizeof(struct user) - 3)
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break;
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if (addr < sizeof(struct pt_regs))
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ret = put_stack_long(child, addr, data);
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else if (addr >= (long) &dummy->fpu &&
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addr < (long) &dummy->u_fpvalid) {
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set_stopped_child_used_math(child);
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((long *)child->thread.xstate)
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[(addr - (long)&dummy->fpu) >> 2] = data;
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ret = 0;
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} else if (addr == (long) &dummy->u_fpvalid) {
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conditional_stopped_child_used_math(data, child);
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ret = 0;
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}
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break;
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case PTRACE_GETREGS:
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return copy_regset_to_user(child, &user_sh_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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(void __user *)data);
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case PTRACE_SETREGS:
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return copy_regset_from_user(child, &user_sh_native_view,
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REGSET_GENERAL,
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0, sizeof(struct pt_regs),
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(const void __user *)data);
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#ifdef CONFIG_SH_FPU
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case PTRACE_GETFPREGS:
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return copy_regset_to_user(child, &user_sh_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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(void __user *)data);
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case PTRACE_SETFPREGS:
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return copy_regset_from_user(child, &user_sh_native_view,
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REGSET_FPU,
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0, sizeof(struct user_fpu_struct),
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(const void __user *)data);
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#endif
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#ifdef CONFIG_SH_DSP
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case PTRACE_GETDSPREGS:
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return copy_regset_to_user(child, &user_sh_native_view,
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REGSET_DSP,
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0, sizeof(struct pt_dspregs),
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(void __user *)data);
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case PTRACE_SETDSPREGS:
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return copy_regset_from_user(child, &user_sh_native_view,
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REGSET_DSP,
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0, sizeof(struct pt_dspregs),
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(const void __user *)data);
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#endif
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default:
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ret = ptrace_request(child, request, addr, data);
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break;
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}
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return ret;
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}
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static inline int audit_arch(void)
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{
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int arch = EM_SH;
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
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{
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long ret = 0;
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secure_computing(regs->regs[0]);
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if (test_thread_flag(TIF_SYSCALL_TRACE) &&
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tracehook_report_syscall_entry(regs))
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/*
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* Tracing decided this syscall should not happen.
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* We'll return a bogus call number to get an ENOSYS
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* error, but leave the original number in regs->regs[0].
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*/
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ret = -1L;
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_enter(regs, regs->regs[0]);
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if (unlikely(current->audit_context))
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audit_syscall_entry(audit_arch(), regs->regs[3],
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regs->regs[4], regs->regs[5],
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regs->regs[6], regs->regs[7]);
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return ret ?: regs->regs[0];
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}
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asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
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{
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int step;
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if (unlikely(current->audit_context))
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audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
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regs->regs[0]);
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_exit(regs, regs->regs[0]);
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step = test_thread_flag(TIF_SINGLESTEP);
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if (step || test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, step);
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}
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