| /* Remote utility routines for the remote server for GDB. |
| Copyright (C) 1986, 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 2001, 2002, 2003, 2004, 2005, 2006, 2011 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| It has been modified to integrate it in valgrind |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_core_vki.h" |
| #include "pub_core_vkiscnums.h" |
| #include "pub_core_libcsignal.h" |
| #include "pub_core_options.h" |
| |
| #include "server.h" |
| |
| # if defined(VGO_linux) |
| #include <sys/prctl.h> |
| # endif |
| |
| Bool noack_mode; |
| |
| static int readchar (int single); |
| |
| void remote_utils_output_status(void); |
| |
| static int remote_desc; |
| |
| static VgdbShared *shared; |
| static int last_looked_cntr = -1; |
| static struct vki_pollfd remote_desc_pollfdread_activity; |
| #define INVALID_DESCRIPTOR -1 |
| |
| /* for a gdbserver embedded in valgrind, we read from a FIFO and write |
| to another FIFO So, we need two descriptors */ |
| static int write_remote_desc = INVALID_DESCRIPTOR; |
| static int pid_from_to_creator; |
| /* only this pid will remove the FIFOs: if an exec fails, we must avoid |
| that the exiting child believes it has to remove the FIFOs of its parent */ |
| static int mknod_done = 0; |
| |
| static char *from_gdb = NULL; |
| static char *to_gdb = NULL; |
| static char *shared_mem = NULL; |
| |
| static |
| int open_fifo (const char *side, const char *path, int flags) |
| { |
| SysRes o; |
| int fd; |
| dlog(1, "Opening %s side %s\n", side, path); |
| o = VG_(open) (path, flags, 0); |
| if (sr_isError (o)) { |
| sr_perror(o, "open fifo %s\n", path); |
| fatal ("valgrind: fatal error: vgdb FIFO cannot be opened.\n"); |
| } else { |
| fd = sr_Res(o); |
| dlog(1, "result fd %d\n", fd); |
| } |
| fd = VG_(safe_fd)(fd); |
| dlog(1, "result safe_fd %d\n", fd); |
| if (fd == -1) |
| fatal("safe_fd for vgdb FIFO failed\n"); |
| return fd; |
| } |
| |
| void remote_utils_output_status(void) |
| { |
| if (shared == NULL) |
| VG_(umsg)("remote communication not initialized\n"); |
| else |
| VG_(umsg)("shared->written_by_vgdb %d shared->seen_by_valgrind %d\n", |
| shared->written_by_vgdb, shared->seen_by_valgrind); |
| } |
| |
| /* Returns 0 if vgdb and connection state looks good, |
| otherwise returns an int value telling which check failed. */ |
| static |
| int vgdb_state_looks_bad(const char* where) |
| { |
| if (VG_(kill)(shared->vgdb_pid, 0) != 0) |
| return 1; // vgdb process does not exist anymore. |
| |
| if (remote_desc_activity(where) == 2) |
| return 2; // check for error on remote desc shows a problem |
| |
| if (remote_desc == INVALID_DESCRIPTOR) |
| return 3; // after check, remote_desc not ok anymore |
| |
| return 0; // all is ok. |
| } |
| |
| void VG_(set_ptracer)(void) |
| { |
| #ifdef PR_SET_PTRACER |
| SysRes o; |
| const char *ptrace_scope_setting_file = "/proc/sys/kernel/yama/ptrace_scope"; |
| int fd; |
| char ptrace_scope; |
| int ret; |
| |
| o = VG_(open) (ptrace_scope_setting_file, VKI_O_RDONLY, 0); |
| if (sr_isError(o)) { |
| if (VG_(debugLog_getLevel)() >= 1) { |
| sr_perror(o, "error VG_(open) %s\n", ptrace_scope_setting_file); |
| } |
| /* can't read setting. Assuming ptrace can be called by vgdb. */ |
| return; |
| } |
| fd = sr_Res(o); |
| if (VG_(read) (fd, &ptrace_scope, 1) == 1) { |
| dlog(1, "ptrace_scope %c\n", ptrace_scope); |
| if (ptrace_scope != '0') { |
| /* insufficient default ptrace_scope. |
| Indicate to the kernel that we accept to be ptraced. */ |
| #ifdef PR_SET_PTRACER_ANY |
| ret = VG_(prctl) (PR_SET_PTRACER, PR_SET_PTRACER_ANY, 0, 0, 0); |
| dlog(1, "set_ptracer to PR_SET_PTRACER_ANY result %d\n", ret); |
| #else |
| ret = VG_(prctl) (PR_SET_PTRACER, 1, 0, 0, 0); |
| dlog(1, "set_ptracer to 1 result %d\n", ret); |
| #endif |
| if (ret) |
| VG_(umsg)("error calling PR_SET_PTRACER, vgdb might block\n"); |
| } |
| } else { |
| dlog(0, "Could not read the ptrace_scope setting from %s\n", |
| ptrace_scope_setting_file); |
| } |
| |
| VG_(close) (fd); |
| #endif |
| } |
| |
| /* returns 1 if one or more poll "errors" is set. |
| Errors are: VKI_POLLERR or VKI_POLLHUP or VKI_POLLNAL */ |
| static |
| int poll_cond (short revents) |
| { |
| return (revents & (VKI_POLLERR | VKI_POLLHUP | VKI_POLLNVAL)); |
| } |
| |
| /* Ensures we have a valid write file descriptor. |
| Returns 1 if we have a valid write file descriptor, |
| 0 if the write fd could not be opened. */ |
| static |
| int ensure_write_remote_desc(void) |
| { |
| struct vki_pollfd write_remote_desc_ok; |
| int ret; |
| if (write_remote_desc != INVALID_DESCRIPTOR) { |
| write_remote_desc_ok.fd = write_remote_desc; |
| write_remote_desc_ok.events = VKI_POLLOUT; |
| write_remote_desc_ok.revents = 0; |
| ret = VG_(poll)(&write_remote_desc_ok, 1, 0); |
| if (ret && poll_cond(write_remote_desc_ok.revents)) { |
| dlog(1, "POLLcond %d closing write_remote_desc %d\n", |
| write_remote_desc_ok.revents, write_remote_desc); |
| VG_(close) (write_remote_desc); |
| write_remote_desc = INVALID_DESCRIPTOR; |
| } |
| } |
| if (write_remote_desc == INVALID_DESCRIPTOR) { |
| /* open_fifo write will block if the receiving vgdb |
| process is dead. So, let's check for vgdb state to |
| be reasonably sure someone is reading on the other |
| side of the fifo. */ |
| if (!vgdb_state_looks_bad("bad?@ensure_write_remote_desc")) { |
| write_remote_desc = open_fifo ("write", to_gdb, VKI_O_WRONLY); |
| } |
| } |
| |
| return (write_remote_desc != INVALID_DESCRIPTOR); |
| } |
| |
| #if defined(VGO_darwin) |
| #define VKI_S_IFIFO 0010000 |
| #endif |
| static |
| void safe_mknod (char *nod) |
| { |
| SysRes m; |
| m = VG_(mknod) (nod, VKI_S_IFIFO|0600, 0); |
| if (sr_isError (m)) { |
| if (sr_Err (m) == VKI_EEXIST) { |
| if (VG_(clo_verbosity) > 1) { |
| VG_(umsg)("%s already created\n", nod); |
| } |
| } else { |
| sr_perror(m, "mknod %s\n", nod); |
| VG_(umsg) ("valgrind: fatal error: vgdb FIFOs cannot be created.\n"); |
| VG_(exit)(1); |
| } |
| } |
| } |
| |
| /* Open a connection to a remote debugger. |
| NAME is the filename used for communication. |
| For Valgrind, name is the prefix for the two read and write FIFOs |
| The two FIFOs names will be build by appending |
| -from-vgdb-to-pid-by-user-on-host and -to-vgdb-from-pid-by-user-on-host |
| with pid being the pidnr of the valgrind process These two FIFOs |
| will be created if not existing yet. They will be removed when |
| the gdbserver connection is closed or the process exits */ |
| |
| void remote_open (const HChar *name) |
| { |
| const HChar *user, *host; |
| int save_fcntl_flags, len; |
| VgdbShared vgdbinit = |
| {0, 0, (Addr) VG_(invoke_gdbserver), |
| (Addr) VG_(threads), sizeof(ThreadState), |
| offsetof(ThreadState, status), |
| offsetof(ThreadState, os_state) + offsetof(ThreadOSstate, lwpid), |
| 0}; |
| const int pid = VG_(getpid)(); |
| const int name_default = strcmp(name, VG_(vgdb_prefix_default)()) == 0; |
| Addr addr_shared; |
| SysRes o; |
| int shared_mem_fd = INVALID_DESCRIPTOR; |
| |
| user = VG_(getenv)("LOGNAME"); |
| if (user == NULL) user = VG_(getenv)("USER"); |
| if (user == NULL) user = "???"; |
| |
| host = VG_(getenv)("HOST"); |
| if (host == NULL) host = VG_(getenv)("HOSTNAME"); |
| if (host == NULL) host = "???"; |
| |
| len = strlen(name) + strlen(user) + strlen(host) + 40; |
| |
| if (from_gdb != NULL) |
| free (from_gdb); |
| from_gdb = malloc (len); |
| if (to_gdb != NULL) |
| free (to_gdb); |
| to_gdb = malloc (len); |
| if (shared_mem != NULL) |
| free (shared_mem); |
| shared_mem = malloc (len); |
| /* below 3 lines must match the equivalent in vgdb.c */ |
| VG_(sprintf) (from_gdb, "%s-from-vgdb-to-%d-by-%s-on-%s", name, |
| pid, user, host); |
| VG_(sprintf) (to_gdb, "%s-to-vgdb-from-%d-by-%s-on-%s", name, |
| pid, user, host); |
| VG_(sprintf) (shared_mem, "%s-shared-mem-vgdb-%d-by-%s-on-%s", name, |
| pid, user, host); |
| if (VG_(clo_verbosity) > 1) { |
| VG_(umsg)("embedded gdbserver: reading from %s\n", from_gdb); |
| VG_(umsg)("embedded gdbserver: writing to %s\n", to_gdb); |
| VG_(umsg)("embedded gdbserver: shared mem %s\n", shared_mem); |
| VG_(umsg)("\n"); |
| VG_(umsg)("TO CONTROL THIS PROCESS USING vgdb (which you probably\n" |
| "don't want to do, unless you know exactly what you're doing,\n" |
| "or are doing some strange experiment):\n" |
| " %s/../../bin/vgdb --pid=%d%s%s ...command...\n", |
| VG_(libdir), |
| pid, (name_default ? "" : " --vgdb-prefix="), |
| (name_default ? "" : name)); |
| } |
| if (VG_(clo_verbosity) > 1 |
| || VG_(clo_vgdb_error) < 999999999) { |
| VG_(umsg)("\n"); |
| VG_(umsg)( |
| "TO DEBUG THIS PROCESS USING GDB: start GDB like this\n" |
| " /path/to/gdb %s\n" |
| "and then give GDB the following command\n" |
| " target remote | %s/../../bin/vgdb --pid=%d%s%s\n", |
| VG_(args_the_exename), |
| VG_(libdir), |
| pid, (name_default ? "" : " --vgdb-prefix="), |
| (name_default ? "" : name) |
| ); |
| VG_(umsg)("--pid is optional if only one valgrind process is running\n"); |
| VG_(umsg)("\n"); |
| } |
| |
| if (!mknod_done) { |
| mknod_done++; |
| VG_(set_ptracer)(); |
| /* |
| * Unlink just in case a previous process with the same PID had been |
| * killed and hence Valgrind hasn't had the chance yet to remove these. |
| */ |
| VG_(unlink)(from_gdb); |
| VG_(unlink)(to_gdb); |
| VG_(unlink)(shared_mem); |
| |
| safe_mknod(from_gdb); |
| safe_mknod(to_gdb); |
| |
| pid_from_to_creator = pid; |
| |
| o = VG_(open) (shared_mem, VKI_O_CREAT|VKI_O_RDWR, 0600); |
| if (sr_isError (o)) { |
| sr_perror(o, "cannot create shared_mem file %s\n", shared_mem); |
| fatal(""); |
| } else { |
| shared_mem_fd = sr_Res(o); |
| } |
| |
| if (VG_(write)(shared_mem_fd, &vgdbinit, sizeof(VgdbShared)) |
| != sizeof(VgdbShared)) { |
| fatal("error writing %d bytes to shared mem %s\n", |
| (int) sizeof(VgdbShared), shared_mem); |
| } |
| { |
| SysRes res = VG_(am_shared_mmap_file_float_valgrind) |
| (sizeof(VgdbShared), VKI_PROT_READ|VKI_PROT_WRITE, |
| shared_mem_fd, (Off64T)0); |
| if (sr_isError(res)) { |
| sr_perror(res, "error VG_(am_shared_mmap_file_float_valgrind) %s\n", |
| shared_mem); |
| fatal(""); |
| } |
| addr_shared = sr_Res (res); |
| } |
| shared = (VgdbShared*) addr_shared; |
| VG_(close) (shared_mem_fd); |
| } |
| |
| /* we open the read side FIFO in non blocking mode |
| We then set the fd in blocking mode. |
| Opening in non-blocking read mode always succeeds while opening |
| in non-blocking write mode succeeds only if the fifo is already |
| opened in read mode. So, we wait till we have read the first |
| character from the read side before opening the write side. */ |
| remote_desc = open_fifo ("read", from_gdb, VKI_O_RDONLY|VKI_O_NONBLOCK); |
| save_fcntl_flags = VG_(fcntl) (remote_desc, VKI_F_GETFL, 0); |
| VG_(fcntl) (remote_desc, VKI_F_SETFL, save_fcntl_flags & ~VKI_O_NONBLOCK); |
| remote_desc_pollfdread_activity.fd = remote_desc; |
| remote_desc_pollfdread_activity.events = VKI_POLLIN; |
| remote_desc_pollfdread_activity.revents = 0; |
| } |
| |
| /* sync_gdb_connection wait a time long enough to let the connection |
| be properly closed if needed when closing the connection (in case |
| of detach or error), if we reopen it too quickly, it seems there |
| are some events queued in the kernel concerning the "old" |
| connection/remote_desc which are discovered with poll or select on |
| the "new" connection/remote_desc. We bypass this by waiting some |
| time to let a proper cleanup to be donex */ |
| void sync_gdb_connection(void) |
| { |
| VG_(poll)(0, 0, 100); |
| } |
| |
| static |
| const char * ppFinishReason (FinishReason reason) |
| { |
| switch (reason) { |
| case orderly_finish: return "orderly_finish"; |
| case reset_after_error: return "reset_after_error"; |
| case reset_after_fork: return "reset_after_fork"; |
| default: vg_assert (0); |
| } |
| } |
| |
| void remote_finish (FinishReason reason) |
| { |
| dlog(1, "remote_finish (reason %s) %d %d\n", |
| ppFinishReason(reason), remote_desc, write_remote_desc); |
| reset_valgrind_sink(ppFinishReason(reason)); |
| if (write_remote_desc != INVALID_DESCRIPTOR) |
| VG_(close) (write_remote_desc); |
| write_remote_desc = INVALID_DESCRIPTOR; |
| if (remote_desc != INVALID_DESCRIPTOR) { |
| remote_desc_pollfdread_activity.fd = INVALID_DESCRIPTOR; |
| remote_desc_pollfdread_activity.events = 0; |
| remote_desc_pollfdread_activity.revents = 0; |
| VG_(close) (remote_desc); |
| } |
| remote_desc = INVALID_DESCRIPTOR; |
| noack_mode = False; |
| |
| /* ensure the child will create its own FIFOs */ |
| if (reason == reset_after_fork) |
| mknod_done = 0; |
| |
| if (reason == reset_after_error) |
| sync_gdb_connection(); |
| } |
| |
| /* orderly close, cleans up everything */ |
| void remote_close (void) |
| { |
| const int pid = VG_(getpid)(); |
| remote_finish(orderly_finish); |
| if (pid == pid_from_to_creator) { |
| dlog(1, "unlinking\n %s\n %s\n %s\n", |
| from_gdb, to_gdb, shared_mem); |
| if (VG_(unlink) (from_gdb) == -1) |
| warning ("could not unlink %s\n", from_gdb); |
| if (VG_(unlink) (to_gdb) == -1) |
| warning ("could not unlink %s\n", to_gdb); |
| if (VG_(unlink) (shared_mem) == -1) |
| warning ("could not unlink %s\n", shared_mem); |
| } |
| else { |
| dlog(1, "not creator => not unlinking %s and %s\n", from_gdb, to_gdb); |
| } |
| free (from_gdb); |
| free (to_gdb); |
| } |
| |
| Bool remote_connected(void) |
| { |
| return write_remote_desc != INVALID_DESCRIPTOR; |
| } |
| |
| /* cleanup after an error detected by poll_cond */ |
| static |
| void error_poll_cond(void) |
| { |
| /* if we will close the connection, we assume either that |
| all characters have been seen or that they will be dropped. */ |
| shared->seen_by_valgrind = shared->written_by_vgdb; |
| remote_finish(reset_after_error); |
| } |
| |
| /* remote_desc_activity might be used at high frequency if the user |
| gives a small value to --vgdb-poll. So, the function avoids |
| doing repetitively system calls by rather looking at the |
| counter values maintained in shared memory by vgdb. */ |
| int remote_desc_activity(const char *msg) |
| { |
| int ret; |
| const int looking_at = shared->written_by_vgdb; |
| if (shared->seen_by_valgrind == looking_at) |
| // if (last_looked_cntr == looking_at) |
| return 0; |
| if (remote_desc == INVALID_DESCRIPTOR) |
| return 0; |
| |
| /* poll the remote desc */ |
| remote_desc_pollfdread_activity.revents = 0; |
| ret = VG_(poll) (&remote_desc_pollfdread_activity, 1, 0); |
| if (ret && poll_cond(remote_desc_pollfdread_activity.revents)) { |
| dlog(1, "POLLcond %d remote_desc_pollfdread %d\n", |
| remote_desc_pollfdread_activity.revents, remote_desc); |
| error_poll_cond(); |
| ret = 2; |
| } |
| dlog(1, |
| "remote_desc_activity %s %d last_looked_cntr %d looking_at %d" |
| " shared->written_by_vgdb %d shared->seen_by_valgrind %d" |
| " ret %d\n", |
| msg, remote_desc, last_looked_cntr, looking_at, |
| shared->written_by_vgdb, shared->seen_by_valgrind, |
| ret); |
| /* if no error from poll, indicate we have "seen" up to looking_at */ |
| if (ret != 2) |
| last_looked_cntr = looking_at; |
| return ret; |
| } |
| |
| /* Convert hex digit A to a number. */ |
| |
| static |
| int fromhex (int a) |
| { |
| if (a >= '0' && a <= '9') |
| return a - '0'; |
| else if (a >= 'a' && a <= 'f') |
| return a - 'a' + 10; |
| else |
| error ("Reply contains invalid hex digit 0x%x\n", a); |
| return 0; |
| } |
| |
| int unhexify (char *bin, const char *hex, int count) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| if (hex[0] == 0 || hex[1] == 0) { |
| /* Hex string is short, or of uneven length. |
| Return the count that has been converted so far. */ |
| return i; |
| } |
| *bin++ = fromhex (hex[0]) * 16 + fromhex (hex[1]); |
| hex += 2; |
| } |
| return i; |
| } |
| |
| void decode_address (CORE_ADDR *addrp, const char *start, int len) |
| { |
| CORE_ADDR addr; |
| char ch; |
| int i; |
| |
| addr = 0; |
| for (i = 0; i < len; i++) { |
| ch = start[i]; |
| addr = addr << 4; |
| addr = addr | (fromhex (ch) & 0x0f); |
| } |
| *addrp = addr; |
| } |
| |
| /* Convert number NIB to a hex digit. */ |
| |
| static |
| int tohex (int nib) |
| { |
| if (nib < 10) |
| return '0' + nib; |
| else |
| return 'a' + nib - 10; |
| } |
| |
| int hexify (char *hex, const char *bin, int count) |
| { |
| int i; |
| |
| /* May use a length, or a nul-terminated string as input. */ |
| if (count == 0) |
| count = strlen (bin); |
| |
| for (i = 0; i < count; i++) { |
| *hex++ = tohex ((*bin >> 4) & 0xf); |
| *hex++ = tohex (*bin++ & 0xf); |
| } |
| *hex = 0; |
| return i; |
| } |
| |
| /* builds an image of bin according to byte order of the architecture |
| Useful for register and int image */ |
| char* heximage (char *buf, char *bin, int count) |
| { |
| #if defined(VGA_x86) || defined(VGA_amd64) |
| char rev[count]; |
| /* note: no need for trailing \0, length is known with count */ |
| int i; |
| for (i = 0; i < count; i++) |
| rev[i] = bin[count - i - 1]; |
| hexify (buf, rev, count); |
| #else |
| hexify (buf, bin, count); |
| #endif |
| return buf; |
| } |
| |
| void* C2v(CORE_ADDR addr) |
| { |
| return (void*) addr; |
| } |
| |
| |
| /* Convert BUFFER, binary data at least LEN bytes long, into escaped |
| binary data in OUT_BUF. Set *OUT_LEN to the length of the data |
| encoded in OUT_BUF, and return the number of bytes in OUT_BUF |
| (which may be more than *OUT_LEN due to escape characters). The |
| total number of bytes in the output buffer will be at most |
| OUT_MAXLEN. */ |
| |
| int |
| remote_escape_output (const gdb_byte *buffer, int len, |
| gdb_byte *out_buf, int *out_len, |
| int out_maxlen) |
| { |
| int input_index, output_index; |
| |
| output_index = 0; |
| for (input_index = 0; input_index < len; input_index++) { |
| gdb_byte b = buffer[input_index]; |
| |
| if (b == '$' || b == '#' || b == '}' || b == '*') { |
| /* These must be escaped. */ |
| if (output_index + 2 > out_maxlen) |
| break; |
| out_buf[output_index++] = '}'; |
| out_buf[output_index++] = b ^ 0x20; |
| } else { |
| if (output_index + 1 > out_maxlen) |
| break; |
| out_buf[output_index++] = b; |
| } |
| } |
| |
| *out_len = input_index; |
| return output_index; |
| } |
| |
| /* Convert BUFFER, escaped data LEN bytes long, into binary data |
| in OUT_BUF. Return the number of bytes written to OUT_BUF. |
| Raise an error if the total number of bytes exceeds OUT_MAXLEN. |
| |
| This function reverses remote_escape_output. It allows more |
| escaped characters than that function does, in particular because |
| '*' must be escaped to avoid the run-length encoding processing |
| in reading packets. */ |
| |
| static |
| int remote_unescape_input (const gdb_byte *buffer, int len, |
| gdb_byte *out_buf, int out_maxlen) |
| { |
| int input_index, output_index; |
| int escaped; |
| |
| output_index = 0; |
| escaped = 0; |
| for (input_index = 0; input_index < len; input_index++) { |
| gdb_byte b = buffer[input_index]; |
| |
| if (output_index + 1 > out_maxlen) |
| error ("Received too much data (len %d) from the target.\n", len); |
| |
| if (escaped) { |
| out_buf[output_index++] = b ^ 0x20; |
| escaped = 0; |
| } else if (b == '}') { |
| escaped = 1; |
| } else { |
| out_buf[output_index++] = b; |
| } |
| } |
| |
| if (escaped) |
| error ("Unmatched escape character in target response.\n"); |
| |
| return output_index; |
| } |
| |
| /* Look for a sequence of characters which can be run-length encoded. |
| If there are any, update *CSUM and *P. Otherwise, output the |
| single character. Return the number of characters consumed. */ |
| |
| static |
| int try_rle (char *buf, int remaining, unsigned char *csum, char **p) |
| { |
| int n; |
| |
| /* Always output the character. */ |
| *csum += buf[0]; |
| *(*p)++ = buf[0]; |
| |
| /* Don't go past '~'. */ |
| if (remaining > 97) |
| remaining = 97; |
| |
| for (n = 1; n < remaining; n++) |
| if (buf[n] != buf[0]) |
| break; |
| |
| /* N is the index of the first character not the same as buf[0]. |
| buf[0] is counted twice, so by decrementing N, we get the number |
| of characters the RLE sequence will replace. */ |
| n--; |
| |
| if (n < 3) |
| return 1; |
| |
| /* Skip the frame characters. The manual says to skip '+' and '-' |
| also, but there's no reason to. Unfortunately these two unusable |
| characters double the encoded length of a four byte zero |
| value. */ |
| while (n + 29 == '$' || n + 29 == '#') |
| n--; |
| |
| *csum += '*'; |
| *(*p)++ = '*'; |
| *csum += n + 29; |
| *(*p)++ = n + 29; |
| |
| return n + 1; |
| } |
| |
| /* Send a packet to the remote machine, with error checking. |
| The data of the packet is in BUF, and the length of the |
| packet is in CNT. Returns >= 0 on success, -1 otherwise. */ |
| |
| int putpkt_binary (char *buf, int cnt) |
| { |
| int i; |
| unsigned char csum = 0; |
| char *buf2; |
| char *p; |
| int cc; |
| |
| buf2 = malloc (PBUFSIZ); |
| |
| /* Copy the packet into buffer BUF2, encapsulating it |
| and giving it a checksum. */ |
| |
| p = buf2; |
| *p++ = '$'; |
| |
| for (i = 0; i < cnt;) |
| i += try_rle (buf + i, cnt - i, &csum, &p); |
| |
| *p++ = '#'; |
| *p++ = tohex ((csum >> 4) & 0xf); |
| *p++ = tohex (csum & 0xf); |
| |
| *p = '\0'; |
| |
| /* we might have to write a pkt when out FIFO not yet/anymore opened */ |
| if (!ensure_write_remote_desc()) { |
| warning ("putpkt(write) error: no write_remote_desc\n"); |
| return -1; |
| } |
| |
| /* Send it once (noack_mode) |
| or send it over and over until we get a positive ack. */ |
| |
| do { |
| if (VG_(write) (write_remote_desc, buf2, p - buf2) != p - buf2) { |
| warning ("putpkt(write) error\n"); |
| return -1; |
| } |
| |
| if (noack_mode) |
| dlog(1, "putpkt (\"%s\"); [no ack]\n", buf2); |
| else |
| dlog(1,"putpkt (\"%s\"); [looking for ack]\n", buf2); |
| |
| if (noack_mode) |
| break; |
| |
| cc = readchar (1); |
| if (cc > 0) |
| dlog(1, "[received '%c' (0x%x)]\n", cc, cc); |
| |
| if (cc <= 0) { |
| if (cc == 0) |
| dlog(1, "putpkt(read): Got EOF\n"); |
| else |
| warning ("putpkt(read) error\n"); |
| |
| free (buf2); |
| return -1; |
| } |
| |
| /* Check for an input interrupt while we're here. */ |
| if (cc == '\003') |
| dlog(1, "Received 0x03 character (SIGINT)\n"); |
| } |
| while (cc != '+'); |
| |
| free (buf2); |
| return 1; /* Success! */ |
| } |
| |
| /* Send a packet to the remote machine, with error checking. The data |
| of the packet is in BUF, and the packet should be a NUL-terminated |
| string. Returns >= 0 on success, -1 otherwise. */ |
| |
| int putpkt (char *buf) |
| { |
| return putpkt_binary (buf, strlen (buf)); |
| } |
| |
| void monitor_output (char *s) |
| { |
| if (remote_connected()) { |
| const int len = strlen(s); |
| char *buf = malloc(1 + 2*len + 1); |
| |
| buf[0] = 'O'; |
| hexify(buf+1, s, len); |
| if (putpkt (buf) < 0) { |
| /* We probably have lost the connection with vgdb. */ |
| reset_valgrind_sink("Error writing monitor output"); |
| /* write again after reset */ |
| VG_(printf) ("%s", s); |
| } |
| |
| free (buf); |
| } else { |
| print_to_initial_valgrind_sink (s); |
| } |
| } |
| |
| /* Returns next char from remote GDB. -1 if error. */ |
| /* if single, only one character maximum can be read with |
| read system call. Otherwise, when reading an ack character |
| we might pile up the next gdb command in the static buf. |
| The read loop is then blocked in poll till gdb times out. */ |
| static |
| int readchar (int single) |
| { |
| static unsigned char buf[PBUFSIZ]; |
| static int bufcnt = 0; |
| static unsigned char *bufp; |
| int ret; |
| |
| if (bufcnt-- > 0) |
| return *bufp++; |
| |
| if (remote_desc == INVALID_DESCRIPTOR) |
| return -1; |
| |
| /* No characters available in buf => |
| wait for some characters to arrive */ |
| remote_desc_pollfdread_activity.revents = 0; |
| ret = VG_(poll)(&remote_desc_pollfdread_activity, 1, -1); |
| if (ret != 1) { |
| dlog(0, "readchar: poll got %d\n", ret); |
| return -1; |
| } |
| if (single) |
| bufcnt = VG_(read) (remote_desc, buf, 1); |
| else |
| bufcnt = VG_(read) (remote_desc, buf, sizeof (buf)); |
| |
| if (bufcnt <= 0) { |
| if (bufcnt == 0) |
| dlog (1, "readchar: Got EOF\n"); |
| else |
| warning ("readchar read error\n"); |
| |
| return -1; |
| } |
| |
| shared->seen_by_valgrind += bufcnt; |
| |
| /* If we have received a character and we do not yet have a |
| connection, we better open our "write" fifo to let vgdb open its |
| read fifo side */ |
| if (write_remote_desc == INVALID_DESCRIPTOR |
| && !ensure_write_remote_desc()) { |
| dlog(1, "reachar: write_remote_desc could not be created"); |
| } |
| |
| bufp = buf; |
| bufcnt--; |
| |
| if (poll_cond(remote_desc_pollfdread_activity.revents)) { |
| dlog(1, "readchar: POLLcond got %d\n", |
| remote_desc_pollfdread_activity.revents); |
| error_poll_cond(); |
| } |
| |
| return *bufp++; |
| } |
| |
| |
| /* Read a packet from the remote machine, with error checking, |
| and store it in BUF. Returns length of packet, or negative if error. */ |
| |
| int getpkt (char *buf) |
| { |
| char *bp; |
| unsigned char csum, c1, c2; |
| int c; |
| |
| while (1) { |
| csum = 0; |
| |
| while (1) { |
| c = readchar (0); |
| if (c == '$') |
| break; |
| dlog(1, "[getpkt: discarding char '%c']\n", c); |
| if (c < 0) |
| return -1; |
| } |
| |
| bp = buf; |
| while (1) { |
| c = readchar (0); |
| if (c < 0) |
| return -1; |
| if (c == '#') |
| break; |
| *bp++ = c; |
| csum += c; |
| } |
| *bp = 0; |
| |
| c1 = fromhex (readchar (0)); |
| c2 = fromhex (readchar (0)); |
| |
| if (csum == (c1 << 4) + c2) |
| break; |
| |
| dlog (0, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n", |
| (c1 << 4) + c2, csum, buf); |
| if (!ensure_write_remote_desc()) { |
| dlog(1, "getpkt(write nack) no write_remote_desc"); |
| } |
| VG_(write) (write_remote_desc, "-", 1); |
| } |
| |
| if (noack_mode) |
| dlog(1, "getpkt (\"%s\"); [no ack] \n", buf); |
| else |
| dlog(1, "getpkt (\"%s\"); [sending ack] \n", buf); |
| |
| if (!noack_mode) { |
| if (!ensure_write_remote_desc()) { |
| dlog(1, "getpkt(write ack) no write_remote_desc"); |
| } |
| VG_(write) (write_remote_desc, "+", 1); |
| dlog(1, "[sent ack]\n"); |
| } |
| |
| return bp - buf; |
| } |
| |
| void write_ok (char *buf) |
| { |
| buf[0] = 'O'; |
| buf[1] = 'K'; |
| buf[2] = '\0'; |
| } |
| |
| void write_enn (char *buf) |
| { |
| /* Some day, we should define the meanings of the error codes... */ |
| buf[0] = 'E'; |
| buf[1] = '0'; |
| buf[2] = '1'; |
| buf[3] = '\0'; |
| } |
| |
| void convert_int_to_ascii (const unsigned char *from, char *to, int n) |
| { |
| int nib; |
| int ch; |
| while (n--) { |
| ch = *from++; |
| nib = ((ch & 0xf0) >> 4) & 0x0f; |
| *to++ = tohex (nib); |
| nib = ch & 0x0f; |
| *to++ = tohex (nib); |
| } |
| *to++ = 0; |
| } |
| |
| |
| void convert_ascii_to_int (const char *from, unsigned char *to, int n) |
| { |
| int nib1, nib2; |
| while (n--) { |
| nib1 = fromhex (*from++); |
| nib2 = fromhex (*from++); |
| *to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f); |
| } |
| } |
| |
| static |
| char * outreg (int regno, char *buf) |
| { |
| if ((regno >> 12) != 0) |
| *buf++ = tohex ((regno >> 12) & 0xf); |
| if ((regno >> 8) != 0) |
| *buf++ = tohex ((regno >> 8) & 0xf); |
| *buf++ = tohex ((regno >> 4) & 0xf); |
| *buf++ = tohex (regno & 0xf); |
| *buf++ = ':'; |
| collect_register_as_string (regno, buf); |
| buf += 2 * register_size (regno); |
| *buf++ = ';'; |
| |
| return buf; |
| } |
| |
| void prepare_resume_reply (char *buf, char status, unsigned char sig) |
| { |
| int nib; |
| |
| *buf++ = status; |
| |
| nib = ((sig & 0xf0) >> 4); |
| *buf++ = tohex (nib); |
| nib = sig & 0x0f; |
| *buf++ = tohex (nib); |
| |
| if (status == 'T') { |
| const char **regp = gdbserver_expedite_regs; |
| |
| if (valgrind_stopped_by_watchpoint()) { |
| CORE_ADDR addr; |
| int i; |
| |
| strncpy (buf, "watch:", 6); |
| buf += 6; |
| |
| addr = valgrind_stopped_data_address (); |
| |
| /* Convert each byte of the address into two hexadecimal chars. |
| Note that we take sizeof (void *) instead of sizeof (addr); |
| this is to avoid sending a 64-bit address to a 32-bit GDB. */ |
| for (i = sizeof (void *) * 2; i > 0; i--) { |
| *buf++ = tohex ((addr >> (i - 1) * 4) & 0xf); |
| } |
| *buf++ = ';'; |
| } |
| |
| while (*regp) { |
| buf = outreg (find_regno (*regp), buf); |
| regp ++; |
| } |
| |
| { |
| unsigned int gdb_id_from_wait; |
| |
| /* FIXME right place to set this? */ |
| thread_from_wait = |
| ((struct inferior_list_entry *)current_inferior)->id; |
| gdb_id_from_wait = thread_to_gdb_id (current_inferior); |
| |
| dlog(1, "Writing resume reply for %ld\n", thread_from_wait); |
| /* This if (1) ought to be unnecessary. But remote_wait in GDB |
| will claim this event belongs to inferior_ptid if we do not |
| specify a thread, and there's no way for gdbserver to know |
| what inferior_ptid is. */ |
| if (1 || old_thread_from_wait != thread_from_wait) { |
| general_thread = thread_from_wait; |
| VG_(sprintf) (buf, "thread:%x;", gdb_id_from_wait); |
| buf += strlen (buf); |
| old_thread_from_wait = thread_from_wait; |
| } |
| } |
| } |
| /* For W and X, we're done. */ |
| *buf++ = 0; |
| } |
| |
| void decode_m_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr) |
| { |
| int i = 0, j = 0; |
| char ch; |
| *mem_addr_ptr = *len_ptr = 0; |
| |
| while ((ch = from[i++]) != ',') { |
| *mem_addr_ptr = *mem_addr_ptr << 4; |
| *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| } |
| |
| for (j = 0; j < 4; j++) { |
| if ((ch = from[i++]) == 0) |
| break; |
| *len_ptr = *len_ptr << 4; |
| *len_ptr |= fromhex (ch) & 0x0f; |
| } |
| } |
| |
| void decode_M_packet (char *from, CORE_ADDR *mem_addr_ptr, unsigned int *len_ptr, |
| unsigned char *to) |
| { |
| int i = 0; |
| char ch; |
| *mem_addr_ptr = *len_ptr = 0; |
| |
| while ((ch = from[i++]) != ',') { |
| *mem_addr_ptr = *mem_addr_ptr << 4; |
| *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| } |
| |
| while ((ch = from[i++]) != ':') { |
| *len_ptr = *len_ptr << 4; |
| *len_ptr |= fromhex (ch) & 0x0f; |
| } |
| |
| convert_ascii_to_int (&from[i++], to, *len_ptr); |
| } |
| |
| int decode_X_packet (char *from, int packet_len, CORE_ADDR *mem_addr_ptr, |
| unsigned int *len_ptr, unsigned char *to) |
| { |
| int i = 0; |
| char ch; |
| *mem_addr_ptr = *len_ptr = 0; |
| |
| while ((ch = from[i++]) != ',') { |
| *mem_addr_ptr = *mem_addr_ptr << 4; |
| *mem_addr_ptr |= fromhex (ch) & 0x0f; |
| } |
| |
| while ((ch = from[i++]) != ':') { |
| *len_ptr = *len_ptr << 4; |
| *len_ptr |= fromhex (ch) & 0x0f; |
| } |
| |
| if (remote_unescape_input ((const gdb_byte *) &from[i], packet_len - i, |
| to, *len_ptr) != *len_ptr) |
| return -1; |
| |
| return 0; |
| } |
| |
| |
| /* Return the path prefix for the named pipes (FIFOs) used by vgdb/gdb |
| to communicate with valgrind */ |
| HChar * |
| VG_(vgdb_prefix_default)(void) |
| { |
| static HChar *prefix; |
| |
| if (prefix == NULL) { |
| const HChar *tmpdir = VG_(tmpdir)(); |
| prefix = malloc(strlen(tmpdir) + strlen("/vgdb-pipe") + 1); |
| strcpy(prefix, tmpdir); |
| strcat(prefix, "/vgdb-pipe"); |
| } |
| return prefix; |
| } |