/arch/sh/kernel/ptrace_32.c
https://gitlab.com/teobaluta/opw · C · 535 lines · 421 code · 71 blank · 43 comment · 55 complexity · 0a3ebd5c9ceb44765f6eba9be4fc29e2 MD5 · raw file
- /*
- * SuperH process tracing
- *
- * Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- * Copyright (C) 2002 - 2009 Paul Mundt
- *
- * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
- #include <linux/kernel.h>
- #include <linux/sched.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/signal.h>
- #include <linux/io.h>
- #include <linux/audit.h>
- #include <linux/seccomp.h>
- #include <linux/tracehook.h>
- #include <linux/elf.h>
- #include <linux/regset.h>
- #include <linux/hw_breakpoint.h>
- #include <asm/uaccess.h>
- #include <asm/pgtable.h>
- #include <asm/processor.h>
- #include <asm/mmu_context.h>
- #include <asm/syscalls.h>
- #include <asm/fpu.h>
- #define CREATE_TRACE_POINTS
- #include <trace/events/syscalls.h>
- /*
- * This routine will get a word off of the process kernel stack.
- */
- static inline int get_stack_long(struct task_struct *task, int offset)
- {
- unsigned char *stack;
- stack = (unsigned char *)task_pt_regs(task);
- stack += offset;
- return (*((int *)stack));
- }
- /*
- * This routine will put a word on the process kernel stack.
- */
- static inline int put_stack_long(struct task_struct *task, int offset,
- unsigned long data)
- {
- unsigned char *stack;
- stack = (unsigned char *)task_pt_regs(task);
- stack += offset;
- *(unsigned long *) stack = data;
- return 0;
- }
- void ptrace_triggered(struct perf_event *bp,
- struct perf_sample_data *data, struct pt_regs *regs)
- {
- struct perf_event_attr attr;
- /*
- * Disable the breakpoint request here since ptrace has defined a
- * one-shot behaviour for breakpoint exceptions.
- */
- attr = bp->attr;
- attr.disabled = true;
- modify_user_hw_breakpoint(bp, &attr);
- }
- static int set_single_step(struct task_struct *tsk, unsigned long addr)
- {
- struct thread_struct *thread = &tsk->thread;
- struct perf_event *bp;
- struct perf_event_attr attr;
- bp = thread->ptrace_bps[0];
- if (!bp) {
- ptrace_breakpoint_init(&attr);
- attr.bp_addr = addr;
- attr.bp_len = HW_BREAKPOINT_LEN_2;
- attr.bp_type = HW_BREAKPOINT_R;
- bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
- NULL, tsk);
- if (IS_ERR(bp))
- return PTR_ERR(bp);
- thread->ptrace_bps[0] = bp;
- } else {
- int err;
- attr = bp->attr;
- attr.bp_addr = addr;
- /* reenable breakpoint */
- attr.disabled = false;
- err = modify_user_hw_breakpoint(bp, &attr);
- if (unlikely(err))
- return err;
- }
- return 0;
- }
- void user_enable_single_step(struct task_struct *child)
- {
- unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
- set_tsk_thread_flag(child, TIF_SINGLESTEP);
- set_single_step(child, pc);
- }
- void user_disable_single_step(struct task_struct *child)
- {
- clear_tsk_thread_flag(child, TIF_SINGLESTEP);
- }
- /*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure single step bits etc are not set.
- */
- void ptrace_disable(struct task_struct *child)
- {
- user_disable_single_step(child);
- }
- static int genregs_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
- {
- const struct pt_regs *regs = task_pt_regs(target);
- int ret;
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- regs->regs,
- 0, 16 * sizeof(unsigned long));
- if (!ret)
- /* PC, PR, SR, GBR, MACH, MACL, TRA */
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- ®s->pc,
- offsetof(struct pt_regs, pc),
- sizeof(struct pt_regs));
- if (!ret)
- ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_regs), -1);
- return ret;
- }
- static int genregs_set(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- const void *kbuf, const void __user *ubuf)
- {
- struct pt_regs *regs = task_pt_regs(target);
- int ret;
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- regs->regs,
- 0, 16 * sizeof(unsigned long));
- if (!ret && count > 0)
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- ®s->pc,
- offsetof(struct pt_regs, pc),
- sizeof(struct pt_regs));
- if (!ret)
- ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_regs), -1);
- return ret;
- }
- #ifdef CONFIG_SH_FPU
- int fpregs_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
- {
- int ret;
- ret = init_fpu(target);
- if (ret)
- return ret;
- if ((boot_cpu_data.flags & CPU_HAS_FPU))
- return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->hardfpu, 0, -1);
- return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->softfpu, 0, -1);
- }
- static int fpregs_set(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- const void *kbuf, const void __user *ubuf)
- {
- int ret;
- ret = init_fpu(target);
- if (ret)
- return ret;
- set_stopped_child_used_math(target);
- if ((boot_cpu_data.flags & CPU_HAS_FPU))
- return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->hardfpu, 0, -1);
- return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
- &target->thread.xstate->softfpu, 0, -1);
- }
- static int fpregs_active(struct task_struct *target,
- const struct user_regset *regset)
- {
- return tsk_used_math(target) ? regset->n : 0;
- }
- #endif
- #ifdef CONFIG_SH_DSP
- static int dspregs_get(struct task_struct *target,
- const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
- {
- const struct pt_dspregs *regs =
- (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
- int ret;
- ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
- 0, sizeof(struct pt_dspregs));
- if (!ret)
- ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_dspregs), -1);
- return ret;
- }
- static int dspregs_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_dspregs *regs =
- (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
- int ret;
- ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
- 0, sizeof(struct pt_dspregs));
- if (!ret)
- ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
- sizeof(struct pt_dspregs), -1);
- return ret;
- }
- static int dspregs_active(struct task_struct *target,
- const struct user_regset *regset)
- {
- struct pt_regs *regs = task_pt_regs(target);
- return regs->sr & SR_DSP ? regset->n : 0;
- }
- #endif
- const struct pt_regs_offset regoffset_table[] = {
- REGS_OFFSET_NAME(0),
- REGS_OFFSET_NAME(1),
- REGS_OFFSET_NAME(2),
- REGS_OFFSET_NAME(3),
- REGS_OFFSET_NAME(4),
- REGS_OFFSET_NAME(5),
- REGS_OFFSET_NAME(6),
- REGS_OFFSET_NAME(7),
- REGS_OFFSET_NAME(8),
- REGS_OFFSET_NAME(9),
- REGS_OFFSET_NAME(10),
- REGS_OFFSET_NAME(11),
- REGS_OFFSET_NAME(12),
- REGS_OFFSET_NAME(13),
- REGS_OFFSET_NAME(14),
- REGS_OFFSET_NAME(15),
- REG_OFFSET_NAME(pc),
- REG_OFFSET_NAME(pr),
- REG_OFFSET_NAME(sr),
- REG_OFFSET_NAME(gbr),
- REG_OFFSET_NAME(mach),
- REG_OFFSET_NAME(macl),
- REG_OFFSET_NAME(tra),
- REG_OFFSET_END,
- };
- /*
- * These are our native regset flavours.
- */
- enum sh_regset {
- REGSET_GENERAL,
- #ifdef CONFIG_SH_FPU
- REGSET_FPU,
- #endif
- #ifdef CONFIG_SH_DSP
- REGSET_DSP,
- #endif
- };
- static const struct user_regset sh_regsets[] = {
- /*
- * Format is:
- * R0 --> R15
- * PC, PR, SR, GBR, MACH, MACL, TRA
- */
- [REGSET_GENERAL] = {
- .core_note_type = NT_PRSTATUS,
- .n = ELF_NGREG,
- .size = sizeof(long),
- .align = sizeof(long),
- .get = genregs_get,
- .set = genregs_set,
- },
- #ifdef CONFIG_SH_FPU
- [REGSET_FPU] = {
- .core_note_type = NT_PRFPREG,
- .n = sizeof(struct user_fpu_struct) / sizeof(long),
- .size = sizeof(long),
- .align = sizeof(long),
- .get = fpregs_get,
- .set = fpregs_set,
- .active = fpregs_active,
- },
- #endif
- #ifdef CONFIG_SH_DSP
- [REGSET_DSP] = {
- .n = sizeof(struct pt_dspregs) / sizeof(long),
- .size = sizeof(long),
- .align = sizeof(long),
- .get = dspregs_get,
- .set = dspregs_set,
- .active = dspregs_active,
- },
- #endif
- };
- static const struct user_regset_view user_sh_native_view = {
- .name = "sh",
- .e_machine = EM_SH,
- .regsets = sh_regsets,
- .n = ARRAY_SIZE(sh_regsets),
- };
- const struct user_regset_view *task_user_regset_view(struct task_struct *task)
- {
- return &user_sh_native_view;
- }
- long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
- {
- unsigned long __user *datap = (unsigned long __user *)data;
- int ret;
- switch (request) {
- /* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
- if (addr < sizeof(struct pt_regs))
- tmp = get_stack_long(child, addr);
- else if (addr >= offsetof(struct user, fpu) &&
- addr < offsetof(struct user, u_fpvalid)) {
- if (!tsk_used_math(child)) {
- if (addr == offsetof(struct user, fpu.fpscr))
- tmp = FPSCR_INIT;
- else
- tmp = 0;
- } else {
- unsigned long index;
- ret = init_fpu(child);
- if (ret)
- break;
- index = addr - offsetof(struct user, fpu);
- tmp = ((unsigned long *)child->thread.xstate)
- [index >> 2];
- }
- } else if (addr == offsetof(struct user, u_fpvalid))
- tmp = !!tsk_used_math(child);
- else if (addr == PT_TEXT_ADDR)
- tmp = child->mm->start_code;
- else if (addr == PT_DATA_ADDR)
- tmp = child->mm->start_data;
- else if (addr == PT_TEXT_END_ADDR)
- tmp = child->mm->end_code;
- else if (addr == PT_TEXT_LEN)
- tmp = child->mm->end_code - child->mm->start_code;
- else
- tmp = 0;
- ret = put_user(tmp, datap);
- break;
- }
- case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
- ret = -EIO;
- if ((addr & 3) || addr < 0 ||
- addr > sizeof(struct user) - 3)
- break;
- if (addr < sizeof(struct pt_regs))
- ret = put_stack_long(child, addr, data);
- else if (addr >= offsetof(struct user, fpu) &&
- addr < offsetof(struct user, u_fpvalid)) {
- unsigned long index;
- ret = init_fpu(child);
- if (ret)
- break;
- index = addr - offsetof(struct user, fpu);
- set_stopped_child_used_math(child);
- ((unsigned long *)child->thread.xstate)
- [index >> 2] = data;
- ret = 0;
- } else if (addr == offsetof(struct user, u_fpvalid)) {
- conditional_stopped_child_used_math(data, child);
- ret = 0;
- }
- break;
- case PTRACE_GETREGS:
- return copy_regset_to_user(child, &user_sh_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
- case PTRACE_SETREGS:
- return copy_regset_from_user(child, &user_sh_native_view,
- REGSET_GENERAL,
- 0, sizeof(struct pt_regs),
- datap);
- #ifdef CONFIG_SH_FPU
- case PTRACE_GETFPREGS:
- return copy_regset_to_user(child, &user_sh_native_view,
- REGSET_FPU,
- 0, sizeof(struct user_fpu_struct),
- datap);
- case PTRACE_SETFPREGS:
- return copy_regset_from_user(child, &user_sh_native_view,
- REGSET_FPU,
- 0, sizeof(struct user_fpu_struct),
- datap);
- #endif
- #ifdef CONFIG_SH_DSP
- case PTRACE_GETDSPREGS:
- return copy_regset_to_user(child, &user_sh_native_view,
- REGSET_DSP,
- 0, sizeof(struct pt_dspregs),
- datap);
- case PTRACE_SETDSPREGS:
- return copy_regset_from_user(child, &user_sh_native_view,
- REGSET_DSP,
- 0, sizeof(struct pt_dspregs),
- datap);
- #endif
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
- return ret;
- }
- static inline int audit_arch(void)
- {
- int arch = EM_SH;
- #ifdef CONFIG_CPU_LITTLE_ENDIAN
- arch |= __AUDIT_ARCH_LE;
- #endif
- return arch;
- }
- asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
- {
- long ret = 0;
- secure_computing_strict(regs->regs[0]);
- if (test_thread_flag(TIF_SYSCALL_TRACE) &&
- tracehook_report_syscall_entry(regs))
- /*
- * Tracing decided this syscall should not happen.
- * We'll return a bogus call number to get an ENOSYS
- * error, but leave the original number in regs->regs[0].
- */
- ret = -1L;
- if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
- trace_sys_enter(regs, regs->regs[0]);
- audit_syscall_entry(audit_arch(), regs->regs[3],
- regs->regs[4], regs->regs[5],
- regs->regs[6], regs->regs[7]);
- return ret ?: regs->regs[0];
- }
- asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
- {
- int step;
- audit_syscall_exit(regs);
- if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
- trace_sys_exit(regs, regs->regs[0]);
- step = test_thread_flag(TIF_SINGLESTEP);
- if (step || test_thread_flag(TIF_SYSCALL_TRACE))
- tracehook_report_syscall_exit(regs, step);
- }