| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2004 PathScale, Inc |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <errno.h> |
| 7 | #include <string.h> |
| 8 | #include "sysdep/ptrace_user.h" |
| 9 | #include "sysdep/ptrace.h" |
| 10 | #include "uml-config.h" |
| 11 | #include "skas_ptregs.h" |
| 12 | #include "registers.h" |
| 13 | #include "user.h" |
| 14 | |
| 15 | /* These are set once at boot time and not changed thereafter */ |
| 16 | |
| 17 | static unsigned long exec_regs[HOST_FRAME_SIZE]; |
| 18 | static unsigned long exec_fp_regs[HOST_FP_SIZE]; |
| 19 | static unsigned long exec_fpx_regs[HOST_XFP_SIZE]; |
| 20 | static int have_fpx_regs = 1; |
| 21 | |
| 22 | void init_thread_registers(union uml_pt_regs *to) |
| 23 | { |
| 24 | memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs)); |
| 25 | memcpy(to->skas.fp, exec_fp_regs, sizeof(to->skas.fp)); |
| 26 | if(have_fpx_regs) |
| 27 | memcpy(to->skas.xfp, exec_fpx_regs, sizeof(to->skas.xfp)); |
| 28 | } |
| 29 | |
| 30 | /* XXX These need to use [GS]ETFPXREGS and copy_sc_{to,from}_user_skas needs |
| 31 | * to pass in a sufficiently large buffer |
| 32 | */ |
| 33 | int save_fp_registers(int pid, unsigned long *fp_regs) |
| 34 | { |
| 35 | if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0) |
| 36 | return(-errno); |
| 37 | return(0); |
| 38 | } |
| 39 | |
| 40 | int restore_fp_registers(int pid, unsigned long *fp_regs) |
| 41 | { |
| 42 | if(ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0) |
| 43 | return(-errno); |
| 44 | return(0); |
| 45 | } |
| 46 | |
| 47 | static int move_registers(int pid, int int_op, union uml_pt_regs *regs, |
| 48 | int fp_op, unsigned long *fp_regs) |
| 49 | { |
| 50 | if(ptrace(int_op, pid, 0, regs->skas.regs) < 0) |
| 51 | return(-errno); |
| 52 | |
| 53 | if(ptrace(fp_op, pid, 0, fp_regs) < 0) |
| 54 | return(-errno); |
| 55 | |
| 56 | return(0); |
| 57 | } |
| 58 | |
| 59 | void save_registers(int pid, union uml_pt_regs *regs) |
| 60 | { |
| 61 | unsigned long *fp_regs; |
| 62 | int err, fp_op; |
| 63 | |
| 64 | if(have_fpx_regs){ |
| 65 | fp_op = PTRACE_GETFPXREGS; |
| 66 | fp_regs = regs->skas.xfp; |
| 67 | } |
| 68 | else { |
| 69 | fp_op = PTRACE_GETFPREGS; |
| 70 | fp_regs = regs->skas.fp; |
| 71 | } |
| 72 | |
| 73 | err = move_registers(pid, PTRACE_GETREGS, regs, fp_op, fp_regs); |
| 74 | if(err) |
| 75 | panic("save_registers - saving registers failed, errno = %d\n", |
| 76 | -err); |
| 77 | } |
| 78 | |
| 79 | void restore_registers(int pid, union uml_pt_regs *regs) |
| 80 | { |
| 81 | unsigned long *fp_regs; |
| 82 | int err, fp_op; |
| 83 | |
| 84 | if(have_fpx_regs){ |
| 85 | fp_op = PTRACE_SETFPXREGS; |
| 86 | fp_regs = regs->skas.xfp; |
| 87 | } |
| 88 | else { |
| 89 | fp_op = PTRACE_SETFPREGS; |
| 90 | fp_regs = regs->skas.fp; |
| 91 | } |
| 92 | |
| 93 | err = move_registers(pid, PTRACE_SETREGS, regs, fp_op, fp_regs); |
| 94 | if(err) |
| 95 | panic("restore_registers - saving registers failed, " |
| 96 | "errno = %d\n", -err); |
| 97 | } |
| 98 | |
| 99 | void init_registers(int pid) |
| 100 | { |
| 101 | int err; |
| 102 | |
| 103 | err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs); |
| 104 | if(err) |
| 105 | panic("check_ptrace : PTRACE_GETREGS failed, errno = %d", |
| 106 | err); |
| 107 | |
| 108 | err = ptrace(PTRACE_GETFPXREGS, pid, 0, exec_fpx_regs); |
| 109 | if(!err) |
| 110 | return; |
| 111 | |
| 112 | have_fpx_regs = 0; |
| 113 | if(err != EIO) |
| 114 | panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d", |
| 115 | err); |
| 116 | |
| 117 | err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs); |
| 118 | if(err) |
| 119 | panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d", |
| 120 | err); |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 125 | * Emacs will notice this stuff at the end of the file and automatically |
| 126 | * adjust the settings for this buffer only. This must remain at the end |
| 127 | * of the file. |
| 128 | * --------------------------------------------------------------------------- |
| 129 | * Local variables: |
| 130 | * c-file-style: "linux" |
| 131 | * End: |
| 132 | */ |