| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * OpenRISC ptrace.c |
| * |
| * Linux architectural port borrowing liberally from similar works of |
| * others. All original copyrights apply as per the original source |
| * declaration. |
| * |
| * Modifications for the OpenRISC architecture: |
| * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
| * Copyright (C) 2005 Gyorgy Jeney <nog@bsemi.com> |
| * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/sched/task_stack.h> |
| #include <linux/string.h> |
| |
| #include <linux/mm.h> |
| #include <linux/errno.h> |
| #include <linux/ptrace.h> |
| #include <linux/audit.h> |
| #include <linux/regset.h> |
| #include <linux/tracehook.h> |
| #include <linux/elf.h> |
| |
| #include <asm/thread_info.h> |
| #include <asm/page.h> |
| |
| /* |
| * Copy the thread state to a regset that can be interpreted by userspace. |
| * |
| * It doesn't matter what our internal pt_regs structure looks like. The |
| * important thing is that we export a consistent view of the thread state |
| * to userspace. As such, we need to make sure that the regset remains |
| * ABI compatible as defined by the struct user_regs_struct: |
| * |
| * (Each item is a 32-bit word) |
| * r0 = 0 (exported for clarity) |
| * 31 GPRS r1-r31 |
| * PC (Program counter) |
| * SR (Supervision register) |
| */ |
| 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; |
| |
| /* r0 */ |
| ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, 0, 4); |
| |
| if (!ret) |
| ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| regs->gpr+1, 4, 4*32); |
| if (!ret) |
| ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| ®s->pc, 4*32, 4*33); |
| if (!ret) |
| ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| ®s->sr, 4*33, 4*34); |
| if (!ret) |
| ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, |
| 4*34, -1); |
| |
| return ret; |
| } |
| |
| /* |
| * Set the thread state from a regset passed in via ptrace |
| */ |
| 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; |
| |
| /* ignore r0 */ |
| ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 0, 4); |
| /* r1 - r31 */ |
| if (!ret) |
| ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| regs->gpr+1, 4, 4*32); |
| /* PC */ |
| if (!ret) |
| ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| ®s->pc, 4*32, 4*33); |
| /* |
| * Skip SR and padding... userspace isn't allowed to changes bits in |
| * the Supervision register |
| */ |
| if (!ret) |
| ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
| 4*33, -1); |
| |
| return ret; |
| } |
| |
| /* |
| * Define the register sets available on OpenRISC under Linux |
| */ |
| enum or1k_regset { |
| REGSET_GENERAL, |
| }; |
| |
| static const struct user_regset or1k_regsets[] = { |
| [REGSET_GENERAL] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = ELF_NGREG, |
| .size = sizeof(long), |
| .align = sizeof(long), |
| .get = genregs_get, |
| .set = genregs_set, |
| }, |
| }; |
| |
| static const struct user_regset_view user_or1k_native_view = { |
| .name = "or1k", |
| .e_machine = EM_OPENRISC, |
| .regsets = or1k_regsets, |
| .n = ARRAY_SIZE(or1k_regsets), |
| }; |
| |
| const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| { |
| return &user_or1k_native_view; |
| } |
| |
| /* |
| * does not yet catch signals sent when the child dies. |
| * in exit.c or in signal.c. |
| */ |
| |
| |
| /* |
| * Called by kernel/ptrace.c when detaching.. |
| * |
| * Make sure the single step bit is not set. |
| */ |
| void ptrace_disable(struct task_struct *child) |
| { |
| pr_debug("ptrace_disable(): TODO\n"); |
| |
| user_disable_single_step(child); |
| clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| } |
| |
| long arch_ptrace(struct task_struct *child, long request, unsigned long addr, |
| unsigned long data) |
| { |
| int ret; |
| |
| switch (request) { |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Notification of system call entry/exit |
| * - triggered by current->work.syscall_trace |
| */ |
| asmlinkage long do_syscall_trace_enter(struct pt_regs *regs) |
| { |
| long ret = 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 <something>. |
| */ |
| ret = -1L; |
| |
| audit_syscall_entry(regs->gpr[11], regs->gpr[3], regs->gpr[4], |
| regs->gpr[5], regs->gpr[6]); |
| |
| return ret ? : regs->gpr[11]; |
| } |
| |
| asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) |
| { |
| int step; |
| |
| audit_syscall_exit(regs); |
| |
| step = test_thread_flag(TIF_SINGLESTEP); |
| if (step || test_thread_flag(TIF_SYSCALL_TRACE)) |
| tracehook_report_syscall_exit(regs, step); |
| } |