sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
| 3 | /*--- Handle remote gdb protocol. pub_core_gdbserver.h ---*/ |
| 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
| 7 | This file is part of Valgrind, a dynamic binary instrumentation |
| 8 | framework. |
| 9 | |
sewardj | 1568e17 | 2011-06-18 08:28:04 +0000 | [diff] [blame] | 10 | Copyright (C) 2011-2011 Philippe Waroquiers |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 11 | |
| 12 | This program is free software; you can redistribute it and/or |
| 13 | modify it under the terms of the GNU General Public License as |
| 14 | published by the Free Software Foundation; either version 2 of the |
| 15 | License, or (at your option) any later version. |
| 16 | |
| 17 | This program is distributed in the hope that it will be useful, but |
| 18 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 20 | General Public License for more details. |
| 21 | |
| 22 | You should have received a copy of the GNU General Public License |
| 23 | along with this program; if not, write to the Free Software |
| 24 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 25 | 02111-1307, USA. |
| 26 | |
| 27 | The GNU General Public License is contained in the file COPYING. |
| 28 | */ |
| 29 | |
| 30 | #ifndef __PUB_CORE_GDBSERVER_H |
| 31 | #define __PUB_CORE_GDBSERVER_H |
| 32 | |
| 33 | #include "pub_tool_gdbserver.h" |
| 34 | |
sewardj | 997546c | 2011-05-17 18:14:53 +0000 | [diff] [blame] | 35 | |
| 36 | // After a fork or after an exec, call the below to (possibly) terminate |
| 37 | // the previous gdbserver and then activate a new gdbserver |
| 38 | // before any guest code execution, to e.g. allow the user to set |
| 39 | // breakpoints before execution. |
| 40 | // If VG_(clo_vgdb) == No, the below has no effect. |
| 41 | void VG_(gdbserver_prerun_action) (ThreadId tid); |
| 42 | |
sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame] | 43 | // True if there is some activity from vgdb |
| 44 | // If it returns True, then extern void VG_(gdbserver) can be called |
| 45 | // to handle this incoming vgdb request. |
| 46 | extern Bool VG_(gdbserver_activity) (ThreadId tid); |
| 47 | |
| 48 | |
| 49 | /* Called by low level to insert or remove a break or watch point. |
| 50 | Break or watch point implementation is done using help from the tool. |
| 51 | break point support implies some (small) specific instrumentation |
| 52 | taken in charge for all tools by m_translate.c. |
| 53 | |
| 54 | Write/read/access watchpoint can only be provided by tools which are |
| 55 | tracking addressability and/or accessibility of memory |
| 56 | (so typically memcheck can provide it). Note that memcheck addressability |
| 57 | bits do not differentiate between read and write accessibility. |
| 58 | However, when accessing unaddressable byte, memcheck can differentiate |
| 59 | reads from write, thereby providing read/write or access watchpoints. |
| 60 | |
| 61 | Note that gdbserver assumes that software breakpoint is supported |
| 62 | (as this will be done by re-instrumenting the code). |
| 63 | Note that len is ignored for sofware breakpoints. hardware_breakpoint |
| 64 | are not supported. |
| 65 | |
| 66 | Returns True if the point has properly been inserted or removed |
| 67 | Returns False otherwise. */ |
| 68 | Bool VG_(gdbserver_point) (PointKind kind, Bool insert, |
| 69 | Addr addr, int len); |
| 70 | |
| 71 | /* Entry point invoked by vgdb when it uses ptrace to cause a gdbserver |
| 72 | invocation. A magic value is passed by vgdb in check as a verification |
| 73 | that the call has been properly pushed by vgdb. */ |
| 74 | extern void VG_(invoke_gdbserver) ( int check ); |
| 75 | |
| 76 | // To be called before delivering a signal. |
| 77 | // Returns True if gdb user asks to pass the signal to the client. |
| 78 | // Note that if the below returns True, the signal might |
| 79 | // still be ignored if this is the action desired by the |
| 80 | // guest program. |
| 81 | extern Bool VG_(gdbserver_report_signal) (Int signo, ThreadId tid); |
| 82 | |
| 83 | /* software_breakpoint, single step and jump support ------------------------*/ |
| 84 | /* VG_(instrument_for_gdbserver_if_needed) allows to do "standard and easy" |
| 85 | instrumentation for gdbserver. |
| 86 | VG_(instrument_for_gdbserver_if_needed) does the following: |
| 87 | * checks if gdbserver instrumentation is needed for vge. |
| 88 | * if no gdbserver instrumentation needed, |
| 89 | returns sb_in |
| 90 | * otherwise |
| 91 | It will instrument sb_in to allow gdbserver to properly |
| 92 | handle breakpoints and single_stepping in sb_in. |
| 93 | All the target jumps of sb_in will also be invalidated |
| 94 | if these are not yet instrumented for gdbserver. |
| 95 | This allows to have single_step working, using a lazily |
| 96 | translation of the blocks which are being single stepped |
| 97 | in. |
| 98 | |
| 99 | The typical usage of this function is to call it on the block |
| 100 | instrumented by the tool instrument function i.e. : |
| 101 | return VG_(instrument_for_gdbserver_if_needed) (sb_out, |
| 102 | layout, |
| 103 | vge, |
| 104 | gWordTy, |
| 105 | hWordTy); |
| 106 | where sb_out is the block instrumented by the tool. |
| 107 | |
| 108 | If the block contains a call to a dirty helper that indirectly |
| 109 | calls gdbserver, then this dirty helper can (indirectly) change |
| 110 | the IP. This implies to jump to this IP after the call to |
| 111 | gdbserver. */ |
| 112 | extern IRSB* VG_(instrument_for_gdbserver_if_needed) |
| 113 | (IRSB* sb_in, /* block to be instrumented */ |
| 114 | VexGuestLayout* layout, |
| 115 | VexGuestExtents* vge, |
| 116 | IRType gWordTy, IRType hWordTy); |
| 117 | |
| 118 | /* reason for which gdbserver connection must be finished */ |
| 119 | typedef |
| 120 | enum { |
| 121 | orderly_finish, |
| 122 | reset_after_error, |
| 123 | reset_after_fork} FinishReason; |
| 124 | |
| 125 | /* output various gdbserver statistics and status. */ |
| 126 | extern void VG_(gdbserver_status_output)(void); |
| 127 | |
| 128 | /* Shared structure between vgdb and the process running |
| 129 | under valgrind. |
| 130 | We define two variants: a 32 bit and a 64 bit. |
| 131 | The valgrind process will use the appropriate size, |
| 132 | according to the architecture. |
| 133 | vgdb will use what the valgrind process is using. */ |
| 134 | /* The below takes care that sizes will be 32 or 64 bits, |
| 135 | whatever the architecture. A.o., vgdb.c cannot use directly |
| 136 | the types from pub_core_threadstate.h as we want vgdb.c to |
| 137 | be independent of the arch it is debugging in case of bi-arch |
| 138 | Valgrind (e.g. x86 and amd64). So, the valgrind process must |
| 139 | give all the needed info/offset to vgdb in the below structure. */ |
| 140 | |
| 141 | typedef |
| 142 | struct { |
| 143 | // PID of the vgdb that last connected to the Valgrind gdbserver. |
| 144 | // It will be set by vgdb after connecting. |
| 145 | int vgdb_pid; |
| 146 | |
| 147 | // nr of bytes vgdb has written to valgrind |
| 148 | volatile int written_by_vgdb; |
| 149 | // nr of bytes seen by valgrind |
| 150 | volatile int seen_by_valgrind; |
| 151 | |
| 152 | // address at which gdbserver can be invoked |
| 153 | Addr32 invoke_gdbserver; |
| 154 | |
| 155 | // address of VG_(threads) and various sizes |
| 156 | // and offset needed by vgdb. |
| 157 | Addr32 threads; |
| 158 | int sizeof_ThreadState; |
| 159 | int offset_status; |
| 160 | int offset_lwpid; |
| 161 | } VgdbShared32; |
| 162 | |
| 163 | /* Same as VgdbShared32 but for 64 bits arch. */ |
| 164 | typedef |
| 165 | struct { |
| 166 | int vgdb_pid; |
| 167 | |
| 168 | volatile int written_by_vgdb; |
| 169 | volatile int seen_by_valgrind; |
| 170 | |
| 171 | Addr64 invoke_gdbserver; |
| 172 | |
| 173 | Addr64 threads; |
| 174 | int sizeof_ThreadState; |
| 175 | int offset_status; |
| 176 | int offset_lwpid; |
| 177 | } VgdbShared64; |
| 178 | |
| 179 | // The below typedef makes the life of valgrind easier. |
| 180 | // vgdb must however work explicitely with the specific 32 or 64 bits version. |
| 181 | |
| 182 | #if VEX_HOST_WORDSIZE == 8 |
| 183 | typedef VgdbShared64 VgdbShared; |
| 184 | #elif VEX_HOST_WORDSIZE == 4 |
| 185 | typedef VgdbShared32 VgdbShared; |
| 186 | #else |
| 187 | # error "unexpected wordsize" |
| 188 | #endif |
| 189 | |
| 190 | |
| 191 | #endif // __PUB_CORE_GDBSERVER_H |
| 192 | /*--------------------------------------------------------------------*/ |
| 193 | /*--- end ---*/ |
| 194 | /*--------------------------------------------------------------------*/ |