registers.c

 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#include <stdlib.h>
14
15/* This is set once at boot time and not changed thereafter */
16
17unsigned long exec_regs[MAX_REG_NR];
18unsigned long *exec_fp_regs;
19
20int init_pid_registers(int pid)
21{
22	int err;
23
24	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
25	if (err < 0)
26		return -errno;
27
28	err = arch_init_registers(pid);
29	if (err < 0)
30		return err;
31
32	exec_fp_regs = malloc(host_fp_size);
33	get_fp_registers(pid, exec_fp_regs);
34	return 0;
35}
36
37void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
38{
39	memcpy(regs, exec_regs, sizeof(exec_regs));
40
41	if (fp_regs)
42		memcpy(fp_regs, exec_fp_regs, host_fp_size);
43}