2019-05-29 22:18:00 +08:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
2017-07-11 09:07:09 +08:00
|
|
|
/*
|
|
|
|
* 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>
|
2018-10-29 18:48:54 +08:00
|
|
|
#include <linux/audit.h>
|
2017-07-11 09:07:09 +08:00
|
|
|
#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>
|
2018-12-11 04:43:55 +08:00
|
|
|
|
|
|
|
#define CREATE_TRACE_POINTS
|
2017-07-11 09:07:09 +08:00
|
|
|
#include <trace/events/syscalls.h>
|
|
|
|
|
|
|
|
enum riscv_regset {
|
|
|
|
REGSET_X,
|
2018-10-18 08:59:05 +08:00
|
|
|
#ifdef CONFIG_FPU
|
|
|
|
REGSET_F,
|
|
|
|
#endif
|
2017-07-11 09:07:09 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
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);
|
2018-06-12 05:48:22 +08:00
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs, 0, -1);
|
2017-07-11 09:07:09 +08:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2018-10-18 08:59:05 +08:00
|
|
|
#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
|
2017-07-11 09:07:09 +08:00
|
|
|
|
|
|
|
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,
|
|
|
|
},
|
2018-10-18 08:59:05 +08:00
|
|
|
#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
|
2017-07-11 09:07:09 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
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.
|
|
|
|
*/
|
2019-10-18 13:20:05 +08:00
|
|
|
__visible void do_syscall_trace_enter(struct pt_regs *regs)
|
2017-07-11 09:07:09 +08:00
|
|
|
{
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE))
|
|
|
|
if (tracehook_report_syscall_entry(regs))
|
|
|
|
syscall_set_nr(current, regs, -1);
|
|
|
|
|
2019-10-05 08:12:22 +08:00
|
|
|
/*
|
|
|
|
* Do the secure computing after ptrace; failures should be fast.
|
|
|
|
* If this fails we might have return value in a0 from seccomp
|
|
|
|
* (via SECCOMP_RET_ERRNO/TRACE).
|
|
|
|
*/
|
2019-12-01 09:23:16 +08:00
|
|
|
if (secure_computing() == -1) {
|
2019-10-05 08:12:22 +08:00
|
|
|
syscall_set_nr(current, regs, -1);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2017-07-11 09:07:09 +08:00
|
|
|
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
|
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
|
|
|
|
trace_sys_enter(regs, syscall_get_nr(current, regs));
|
|
|
|
#endif
|
2018-10-29 18:48:54 +08:00
|
|
|
|
|
|
|
audit_syscall_entry(regs->a7, regs->a0, regs->a1, regs->a2, regs->a3);
|
2017-07-11 09:07:09 +08:00
|
|
|
}
|
|
|
|
|
2019-10-18 13:20:05 +08:00
|
|
|
__visible void do_syscall_trace_exit(struct pt_regs *regs)
|
2017-07-11 09:07:09 +08:00
|
|
|
{
|
2018-10-29 18:48:54 +08:00
|
|
|
audit_syscall_exit(regs);
|
|
|
|
|
2017-07-11 09:07:09 +08:00
|
|
|
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))
|
2018-12-06 23:26:34 +08:00
|
|
|
trace_sys_exit(regs, regs_return_value(regs));
|
2017-07-11 09:07:09 +08:00
|
|
|
#endif
|
|
|
|
}
|