// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/ptrace.h>
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#include <linux/regset.h>
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#include <linux/tracehook.h>
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#include <linux/elf.h>
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#include <linux/sched/task_stack.h>
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enum nds32_regset {
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REGSET_GPR,
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};
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static int gpr_get(struct task_struct *target,
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const struct user_regset *regset,
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struct membuf to)
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{
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return membuf_write(&to, &task_pt_regs(target)->user_regs,
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sizeof(struct user_pt_regs));
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}
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static int gpr_set(struct task_struct *target, 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 err;
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struct user_pt_regs newregs = task_pt_regs(target)->user_regs;
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err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1);
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if (err)
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return err;
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task_pt_regs(target)->user_regs = newregs;
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return 0;
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}
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static const struct user_regset nds32_regsets[] = {
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[REGSET_GPR] = {
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.core_note_type = NT_PRSTATUS,
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.n = sizeof(struct user_pt_regs) / sizeof(u32),
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.size = sizeof(elf_greg_t),
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.align = sizeof(elf_greg_t),
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.regset_get = gpr_get,
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.set = gpr_set}
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};
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static const struct user_regset_view nds32_user_view = {
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.name = "nds32",
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.e_machine = EM_NDS32,
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.regsets = nds32_regsets,
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.n = ARRAY_SIZE(nds32_regsets)
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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 &nds32_user_view;
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}
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void ptrace_disable(struct task_struct *child)
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{
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user_disable_single_step(child);
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}
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/* do_ptrace()
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*
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* Provide ptrace defined service.
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*/
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long arch_ptrace(struct task_struct *child, long request, unsigned long addr,
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unsigned long data)
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{
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int 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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void user_enable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(child);
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regs->ipsw |= PSW_mskHSS;
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set_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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void user_disable_single_step(struct task_struct *child)
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{
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struct pt_regs *regs;
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regs = task_pt_regs(child);
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regs->ipsw &= ~PSW_mskHSS;
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clear_tsk_thread_flag(child, TIF_SINGLESTEP);
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}
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/* sys_trace()
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*
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* syscall trace handler.
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*/
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asmlinkage int 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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forget_syscall(regs);
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}
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return regs->syscallno;
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}
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asmlinkage void syscall_trace_leave(struct pt_regs *regs)
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{
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int step = test_thread_flag(TIF_SINGLESTEP);
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if (step || test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, step);
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}
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