summaryrefslogtreecommitdiffstats
path: root/arch/sh/kernel/ptrace_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/kernel/ptrace_32.c')
-rw-r--r--arch/sh/kernel/ptrace_32.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
new file mode 100644
index 000000000..d417988d9
--- /dev/null
+++ b/arch/sh/kernel/ptrace_32.c
@@ -0,0 +1,487 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * 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>
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.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/elf.h>
+#include <linux/regset.h>
+#include <linux/hw_breakpoint.h>
+#include <linux/uaccess.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,
+ struct membuf to)
+{
+ const struct pt_regs *regs = task_pt_regs(target);
+
+ return membuf_write(&to, regs, sizeof(struct pt_regs));
+}
+
+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,
+ &regs->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
+static int fpregs_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ int ret;
+
+ ret = init_fpu(target);
+ if (ret)
+ return ret;
+
+ return membuf_write(&to, target->thread.xstate,
+ sizeof(struct user_fpu_struct));
+}
+
+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,
+ struct membuf to)
+{
+ const struct pt_dspregs *regs =
+ (struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
+
+ return membuf_write(&to, regs, sizeof(struct pt_dspregs));
+}
+
+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),
+ .regset_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),
+ .regset_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),
+ .regset_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;
+}
+
+asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
+{
+ if (test_thread_flag(TIF_SYSCALL_TRACE) &&
+ ptrace_report_syscall_entry(regs)) {
+ regs->regs[0] = -ENOSYS;
+ return -1;
+ }
+
+ if (secure_computing() == -1)
+ return -1;
+
+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
+ trace_sys_enter(regs, regs->regs[0]);
+
+ audit_syscall_entry(regs->regs[3], regs->regs[4], regs->regs[5],
+ regs->regs[6], regs->regs[7]);
+
+ return 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))
+ ptrace_report_syscall_exit(regs, step);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 14:42:59 +0000