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