| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| * Copyright 2015 Regents of the University of California |
| * Copyright 2017 SiFive |
| * |
| * Copied from arch/tile/kernel/ptrace.c |
| */ |
| |
| #include <asm/ptrace.h> |
| #include <asm/syscall.h> |
| #include <asm/thread_info.h> |
| #include <linux/audit.h> |
| #include <linux/ptrace.h> |
| #include <linux/elf.h> |
| #include <linux/regset.h> |
| #include <linux/sched.h> |
| #include <linux/sched/task_stack.h> |
| #include <linux/tracehook.h> |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/syscalls.h> |
| |
| enum riscv_regset { |
| REGSET_X, |
| #ifdef CONFIG_FPU |
| REGSET_F, |
| #endif |
| }; |
| |
| static int riscv_gpr_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| struct pt_regs *regs; |
| |
| regs = task_pt_regs(target); |
| return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1); |
| } |
| |
| static int riscv_gpr_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; |
| struct pt_regs *regs; |
| |
| regs = task_pt_regs(target); |
| ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1); |
| return ret; |
| } |
| |
| #ifdef CONFIG_FPU |
| static int riscv_fpr_get(struct task_struct *target, |
| const struct user_regset *regset, |
| unsigned int pos, unsigned int count, |
| void *kbuf, void __user *ubuf) |
| { |
| int ret; |
| struct __riscv_d_ext_state *fstate = &target->thread.fstate; |
| |
| ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, fstate, 0, |
| offsetof(struct __riscv_d_ext_state, fcsr)); |
| if (!ret) { |
| ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, fstate, 0, |
| offsetof(struct __riscv_d_ext_state, fcsr) + |
| sizeof(fstate->fcsr)); |
| } |
| |
| return ret; |
| } |
| |
| static int riscv_fpr_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; |
| struct __riscv_d_ext_state *fstate = &target->thread.fstate; |
| |
| ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0, |
| offsetof(struct __riscv_d_ext_state, fcsr)); |
| if (!ret) { |
| ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, fstate, 0, |
| offsetof(struct __riscv_d_ext_state, fcsr) + |
| sizeof(fstate->fcsr)); |
| } |
| |
| return ret; |
| } |
| #endif |
| |
| static const struct user_regset riscv_user_regset[] = { |
| [REGSET_X] = { |
| .core_note_type = NT_PRSTATUS, |
| .n = ELF_NGREG, |
| .size = sizeof(elf_greg_t), |
| .align = sizeof(elf_greg_t), |
| .get = &riscv_gpr_get, |
| .set = &riscv_gpr_set, |
| }, |
| #ifdef CONFIG_FPU |
| [REGSET_F] = { |
| .core_note_type = NT_PRFPREG, |
| .n = ELF_NFPREG, |
| .size = sizeof(elf_fpreg_t), |
| .align = sizeof(elf_fpreg_t), |
| .get = &riscv_fpr_get, |
| .set = &riscv_fpr_set, |
| }, |
| #endif |
| }; |
| |
| static const struct user_regset_view riscv_user_native_view = { |
| .name = "riscv", |
| .e_machine = EM_RISCV, |
| .regsets = riscv_user_regset, |
| .n = ARRAY_SIZE(riscv_user_regset), |
| }; |
| |
| const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| { |
| return &riscv_user_native_view; |
| } |
| |
| void ptrace_disable(struct task_struct *child) |
| { |
| clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); |
| } |
| |
| long arch_ptrace(struct task_struct *child, long request, |
| unsigned long addr, unsigned long data) |
| { |
| long ret = -EIO; |
| |
| switch (request) { |
| default: |
| ret = ptrace_request(child, request, addr, data); |
| break; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * Allows PTRACE_SYSCALL to work. These are called from entry.S in |
| * {handle,ret_from}_syscall. |
| */ |
| void do_syscall_trace_enter(struct pt_regs *regs) |
| { |
| if (test_thread_flag(TIF_SYSCALL_TRACE)) |
| if (tracehook_report_syscall_entry(regs)) |
| syscall_set_nr(current, regs, -1); |
| |
| #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
| if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
| trace_sys_enter(regs, syscall_get_nr(current, regs)); |
| #endif |
| |
| audit_syscall_entry(regs->a7, regs->a0, regs->a1, regs->a2, regs->a3); |
| } |
| |
| void do_syscall_trace_exit(struct pt_regs *regs) |
| { |
| audit_syscall_exit(regs); |
| |
| if (test_thread_flag(TIF_SYSCALL_TRACE)) |
| tracehook_report_syscall_exit(regs, 0); |
| |
| #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
| if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
| trace_sys_exit(regs, regs_return_value(regs)); |
| #endif |
| } |