1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2004 PathScale, Inc
4*4882a593Smuzhiyun * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <errno.h>
8*4882a593Smuzhiyun #include <string.h>
9*4882a593Smuzhiyun #include <sys/ptrace.h>
10*4882a593Smuzhiyun #include <sysdep/ptrace.h>
11*4882a593Smuzhiyun #include <sysdep/ptrace_user.h>
12*4882a593Smuzhiyun #include <registers.h>
13*4882a593Smuzhiyun
save_registers(int pid,struct uml_pt_regs * regs)14*4882a593Smuzhiyun int save_registers(int pid, struct uml_pt_regs *regs)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun int err;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
19*4882a593Smuzhiyun if (err < 0)
20*4882a593Smuzhiyun return -errno;
21*4882a593Smuzhiyun return 0;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
restore_pid_registers(int pid,struct uml_pt_regs * regs)24*4882a593Smuzhiyun int restore_pid_registers(int pid, struct uml_pt_regs *regs)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun int err;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
29*4882a593Smuzhiyun if (err < 0)
30*4882a593Smuzhiyun return -errno;
31*4882a593Smuzhiyun return 0;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /* This is set once at boot time and not changed thereafter */
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun static unsigned long exec_regs[MAX_REG_NR];
37*4882a593Smuzhiyun static unsigned long exec_fp_regs[FP_SIZE];
38*4882a593Smuzhiyun
init_pid_registers(int pid)39*4882a593Smuzhiyun int init_pid_registers(int pid)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun int err;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
44*4882a593Smuzhiyun if (err < 0)
45*4882a593Smuzhiyun return -errno;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun arch_init_registers(pid);
48*4882a593Smuzhiyun get_fp_registers(pid, exec_fp_regs);
49*4882a593Smuzhiyun return 0;
50*4882a593Smuzhiyun }
51*4882a593Smuzhiyun
get_safe_registers(unsigned long * regs,unsigned long * fp_regs)52*4882a593Smuzhiyun void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun memcpy(regs, exec_regs, sizeof(exec_regs));
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if (fp_regs)
57*4882a593Smuzhiyun memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
58*4882a593Smuzhiyun }
59