Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 PathScale, Inc |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 4 | * Licensed under the GPL |
| 5 | */ |
| 6 | |
| 7 | #include <errno.h> |
| 8 | #include <string.h> |
| 9 | #include <sys/ptrace.h> |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 10 | #include "sysdep/ptrace.h" |
Ingo van Lil | fbfe9c8 | 2011-09-14 16:21:23 -0700 | [diff] [blame] | 11 | #include "sysdep/ptrace_user.h" |
| 12 | #include "registers.h" |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 13 | |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 14 | int save_registers(int pid, struct uml_pt_regs *regs) |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 15 | { |
| 16 | int err; |
| 17 | |
Jeff Dike | 18baddd | 2007-10-16 01:27:07 -0700 | [diff] [blame] | 18 | err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 19 | if (err < 0) |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 20 | return -errno; |
| 21 | return 0; |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 22 | } |
| 23 | |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 24 | int restore_registers(int pid, struct uml_pt_regs *regs) |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 25 | { |
| 26 | int err; |
| 27 | |
Jeff Dike | 18baddd | 2007-10-16 01:27:07 -0700 | [diff] [blame] | 28 | err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp); |
Jeff Dike | ba180fd | 2007-10-16 01:27:00 -0700 | [diff] [blame] | 29 | if (err < 0) |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 30 | return -errno; |
| 31 | return 0; |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 32 | } |
| 33 | |
Jeff Dike | d25f2e1 | 2008-02-04 22:30:57 -0800 | [diff] [blame] | 34 | /* This is set once at boot time and not changed thereafter */ |
| 35 | |
| 36 | static unsigned long exec_regs[MAX_REG_NR]; |
Ingo van Lil | fbfe9c8 | 2011-09-14 16:21:23 -0700 | [diff] [blame] | 37 | static unsigned long exec_fp_regs[FP_SIZE]; |
Jeff Dike | d25f2e1 | 2008-02-04 22:30:57 -0800 | [diff] [blame] | 38 | |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 39 | int init_registers(int pid) |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 40 | { |
| 41 | int err; |
| 42 | |
| 43 | err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs); |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 44 | if (err < 0) |
| 45 | return -errno; |
Jeff Dike | a5f6096c | 2007-10-16 01:27:15 -0700 | [diff] [blame] | 46 | |
| 47 | arch_init_registers(pid); |
Ingo van Lil | fbfe9c8 | 2011-09-14 16:21:23 -0700 | [diff] [blame] | 48 | get_fp_registers(pid, exec_fp_regs); |
Jeff Dike | 3e6f2ac | 2008-02-04 22:30:58 -0800 | [diff] [blame] | 49 | return 0; |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 50 | } |
| 51 | |
Ingo van Lil | fbfe9c8 | 2011-09-14 16:21:23 -0700 | [diff] [blame] | 52 | void get_safe_registers(unsigned long *regs, unsigned long *fp_regs) |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 53 | { |
| 54 | memcpy(regs, exec_regs, sizeof(exec_regs)); |
Ingo van Lil | fbfe9c8 | 2011-09-14 16:21:23 -0700 | [diff] [blame] | 55 | |
| 56 | if (fp_regs) |
| 57 | memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs)); |
Jeff Dike | 42daba3 | 2007-10-16 01:26:47 -0700 | [diff] [blame] | 58 | } |