/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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* Copyright 2015 Regents of the University of California
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* Copyright 2017 SiFive
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copied from arch/tile/kernel/ptrace.c
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*/
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#include <asm/ptrace.h>
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#include <asm/syscall.h>
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#include <asm/thread_info.h>
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#include <linux/ptrace.h>
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#include <linux/elf.h>
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#include <linux/regset.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <linux/tracehook.h>
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#include <trace/events/syscalls.h>
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enum riscv_regset {
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REGSET_X,
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};
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static int riscv_gpr_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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struct pt_regs *regs;
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regs = task_pt_regs(target);
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return user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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}
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static int riscv_gpr_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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struct pt_regs *regs;
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regs = task_pt_regs(target);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
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return ret;
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}
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static const struct user_regset riscv_user_regset[] = {
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[REGSET_X] = {
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.core_note_type = NT_PRSTATUS,
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.n = ELF_NGREG,
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.size = sizeof(elf_greg_t),
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.align = sizeof(elf_greg_t),
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.get = &riscv_gpr_get,
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.set = &riscv_gpr_set,
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},
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};
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static const struct user_regset_view riscv_user_native_view = {
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.name = "riscv",
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.e_machine = EM_RISCV,
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.regsets = riscv_user_regset,
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.n = ARRAY_SIZE(riscv_user_regset),
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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 &riscv_user_native_view;
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}
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void ptrace_disable(struct task_struct *child)
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{
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clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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}
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long arch_ptrace(struct task_struct *child, long request,
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unsigned long addr, unsigned long data)
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{
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long ret = -EIO;
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switch (request) {
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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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/*
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* Allows PTRACE_SYSCALL to work. These are called from entry.S in
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* {handle,ret_from}_syscall.
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*/
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void do_syscall_trace_enter(struct pt_regs *regs)
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{
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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if (tracehook_report_syscall_entry(regs))
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syscall_set_nr(current, regs, -1);
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#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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trace_sys_enter(regs, syscall_get_nr(current, regs));
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#endif
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}
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void do_syscall_trace_exit(struct pt_regs *regs)
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{
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, 0);
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#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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trace_sys_exit(regs, regs_return_value(regs));
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#endif
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}
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