Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / arch / um / os-Linux / registers.c
blobb866b9e3bef9ddf212ae4e0f74d489ab66f88827
1 /*
2 * Copyright (C) 2004 PathScale, Inc
3 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 * Licensed under the GPL
5 */
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"
14 int save_registers(int pid, struct uml_pt_regs *regs)
16 int err;
18 err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
19 if (err < 0)
20 return -errno;
21 return 0;
24 int restore_registers(int pid, struct uml_pt_regs *regs)
26 int err;
28 err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
29 if (err < 0)
30 return -errno;
31 return 0;
34 /* This is set once at boot time and not changed thereafter */
36 static unsigned long exec_regs[MAX_REG_NR];
37 static unsigned long exec_fp_regs[FP_SIZE];
39 int init_registers(int pid)
41 int err;
43 err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
44 if (err < 0)
45 return -errno;
47 arch_init_registers(pid);
48 get_fp_registers(pid, exec_fp_regs);
49 return 0;
52 void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
54 memcpy(regs, exec_regs, sizeof(exec_regs));
56 if (fp_regs)
57 memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));