arch/um/os-Linux/sys-x86_64/registers.c

   1 /*
   2  * Copyright (C) 2004 PathScale, Inc
   3  * Licensed under the GPL
   4  */
   5
   6 #include <errno.h>
   7 #include <string.h>
   8 #include "ptrace_user.h"
   9 #include "uml-config.h"
  10 #include "skas_ptregs.h"
  11 #include "registers.h"
  12 #include "user.h"
  13
  14 /* These are set once at boot time and not changed thereafter */
  15
  16 static unsigned long exec_regs[HOST_FRAME_SIZE];
  17 static unsigned long exec_fp_regs[HOST_FP_SIZE];
  18
  19 void init_thread_registers(union uml_pt_regs *to)
  20 {
  21         memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
  22         memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp));
  23 }
  24
  25 static int move_registers(int pid, int int_op, int fp_op,
  26                           union uml_pt_regs *regs)
  27 {
  28         if(ptrace(int_op, pid, 0, regs->skas.regs) < 0)
  29                 return(-errno);
  30
  31         if(ptrace(fp_op, pid, 0, regs->skas.fp) < 0)
  32                 return(-errno);
  33
  34         return(0);
  35 }
  36
  37 void save_registers(int pid, union uml_pt_regs *regs)
  38 {
  39         int err;
  40
  41         err = move_registers(pid, PTRACE_GETREGS, PTRACE_GETFPREGS, regs);
  42         if(err)
  43                 panic("save_registers - saving registers failed, errno = %d\n",
  44                       -err);
  45 }
  46
  47 void restore_registers(int pid, union uml_pt_regs *regs)
  48 {
  49         int err;
  50
  51         err = move_registers(pid, PTRACE_SETREGS, PTRACE_SETFPREGS, regs);
  52         if(err)
  53                 panic("restore_registers - saving registers failed, "
  54                       "errno = %d\n", -err);
  55 }
  56
  57 void init_registers(int pid)
  58 {
  59         int err;
  60
  61         err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
  62         if(err)
  63                 panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
  64                       err);
  65
  66         err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs);
  67         if(err)
  68                 panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d",
  69                       err);
  70 }
  71
  72 /*
  73  * Overrides for Emacs so that we follow Linus's tabbing style.
  74  * Emacs will notice this stuff at the end of the file and automatically
  75  * adjust the settings for this buffer only.  This must remain at the end
  76  * of the file.
  77  * ---------------------------------------------------------------------------
  78  * Local variables:
  79  * c-file-style: "linux"
  80  * End:
  81  */