From 190852c8ac75cb62a737c58edfadfb0e1fcef78a Mon Sep 17 00:00:00 2001 From: Joel Brobecker Date: Thu, 10 May 2018 10:27:13 -0500 Subject: [PATCH] gdbserver/Windows: crash during connection establishment phase On Windows, starting a new process with GDBserver seems to work, in the sense that the program does get started, and GDBserver confirms that it is listening for GDB to connect. However, as soon as GDB establishes the connection with GDBserver, and starts discussing with it, GDBserver crashes, with a SEGV. This SEGV occurs in remote-utils.c::prepare_resume_reply... | regp = current_target_desc ()->expedite_regs; | [...] | while (*regp) ... because, in our case, REGP is NULL. This patches fixes the issues by adding a parameter to init_target_desc, in order to make sure that we always provide the list of registers when we initialize a target description. gdb/ChangeLog: PR server/23158: * regformats/regdat.sh: Adjust script, following the addition of the new expedite_regs parameter to init_target_desc. gdb/gdbserver/ChangeLog: PR server/23158: * tdesc.h (init_target_desc) : New parameter. * tdesc.c (init_target_desc) : New parameter. Use it to set the expedite_regs field in the given tdesc. * x86-tdesc.h: New file. * linux-aarch64-tdesc.c (aarch64_linux_read_description): Adjust following the addition of the new expedite_regs parameter to init_target_desc. * linux-tic6x-low.c (tic6x_read_description): Likewise. * linux-x86-tdesc.c: #include "x86-tdesc.h". (i386_linux_read_description, amd64_linux_read_description): Adjust following the addition of the new expedite_regs parameter to init_target_desc. * lynx-i386-low.c: #include "x86-tdesc.h". (lynx_i386_arch_setup): Adjust following the addition of the new expedite_regs parameter to init_target_desc. * nto-x86-low.c: #include "x86-tdesc.h". (nto_x86_arch_setup): Adjust following the addition of the new expedite_regs parameter to init_target_desc. * win32-i386-low.c: #include "x86-tdesc.h". (i386_arch_setup): Adjust following the addition of the new expedite_regs parameter to init_target_desc. --- gdb/ChangeLog | 6 ++++++ gdb/gdbserver/ChangeLog | 25 +++++++++++++++++++++++++ gdb/gdbserver/linux-aarch64-tdesc.c | 6 +----- gdb/gdbserver/linux-tic6x-low.c | 4 +--- gdb/gdbserver/linux-x86-tdesc.c | 15 +++------------ gdb/gdbserver/lynx-i386-low.c | 3 ++- gdb/gdbserver/nto-x86-low.c | 3 ++- gdb/gdbserver/tdesc.c | 7 ++++++- gdb/gdbserver/tdesc.h | 6 ++++-- gdb/gdbserver/win32-i386-low.c | 5 ++++- gdb/gdbserver/x86-tdesc.h | 26 ++++++++++++++++++++++++++ gdb/regformats/regdat.sh | 3 +-- 12 files changed, 81 insertions(+), 28 deletions(-) create mode 100755 gdb/gdbserver/x86-tdesc.h diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 300e90cfecb..3467467383a 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2018-05-10 Joel Brobecker + + PR server/23158: + * regformats/regdat.sh: Adjust script, following the addition + of the new expedite_regs parameter to init_target_desc. + 2018-05-10 Omair Javaid PR gdb/23127 diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index 6b6f8fc349a..9ead1220a7c 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,28 @@ +2018-05-10 Joel Brobecker + + PR server/23158: + * tdesc.h (init_target_desc) : New parameter. + * tdesc.c (init_target_desc) : New parameter. + Use it to set the expedite_regs field in the given tdesc. + * x86-tdesc.h: New file. + * linux-aarch64-tdesc.c (aarch64_linux_read_description): + Adjust following the addition of the new expedite_regs parameter + to init_target_desc. + * linux-tic6x-low.c (tic6x_read_description): Likewise. + * linux-x86-tdesc.c: #include "x86-tdesc.h". + (i386_linux_read_description, amd64_linux_read_description): + Adjust following the addition of the new expedite_regs parameter + to init_target_desc. + * lynx-i386-low.c: #include "x86-tdesc.h". + (lynx_i386_arch_setup): Adjust following the addition of the new + expedite_regs parameter to init_target_desc. + * nto-x86-low.c: #include "x86-tdesc.h". + (nto_x86_arch_setup): Adjust following the addition of the new + expedite_regs parameter to init_target_desc. + * win32-i386-low.c: #include "x86-tdesc.h". + (i386_arch_setup): Adjust following the addition of the new + expedite_regs parameter to init_target_desc. + 2018-05-10 Joel Brobecker PR server/23158: diff --git a/gdb/gdbserver/linux-aarch64-tdesc.c b/gdb/gdbserver/linux-aarch64-tdesc.c index 9f7b9e5c854..f433038351e 100644 --- a/gdb/gdbserver/linux-aarch64-tdesc.c +++ b/gdb/gdbserver/linux-aarch64-tdesc.c @@ -34,12 +34,8 @@ aarch64_linux_read_description () { *tdesc = aarch64_create_target_description (); - init_target_desc (*tdesc); - -#ifndef IN_PROCESS_AGENT static const char *expedite_regs_aarch64[] = { "x29", "sp", "pc", NULL }; - (*tdesc)->expedite_regs = expedite_regs_aarch64; -#endif + init_target_desc (*tdesc, expedite_regs_aarch64); } return *tdesc; diff --git a/gdb/gdbserver/linux-tic6x-low.c b/gdb/gdbserver/linux-tic6x-low.c index e1df59fefa8..d90bbcfe51f 100644 --- a/gdb/gdbserver/linux-tic6x-low.c +++ b/gdb/gdbserver/linux-tic6x-low.c @@ -199,10 +199,8 @@ tic6x_read_description (enum c6x_feature feature) if (*tdesc == NULL) { *tdesc = tic6x_create_target_description (feature); - init_target_desc (*tdesc); - static const char *expedite_regs[] = { "A15", "PC", NULL }; - (*tdesc)->expedite_regs = expedite_regs; + init_target_desc (*tdesc, expedite_regs); } return *tdesc; diff --git a/gdb/gdbserver/linux-x86-tdesc.c b/gdb/gdbserver/linux-x86-tdesc.c index 47b847619e3..358659b2951 100644 --- a/gdb/gdbserver/linux-x86-tdesc.c +++ b/gdb/gdbserver/linux-x86-tdesc.c @@ -25,6 +25,7 @@ #ifdef __x86_64__ #include "arch/amd64.h" #endif +#include "x86-tdesc.h" /* Return the right x86_linux_tdesc index for a given XCR0. Return X86_TDESC_LAST if can't find a match. */ @@ -88,12 +89,7 @@ i386_linux_read_description (uint64_t xcr0) { *tdesc = i386_create_target_description (xcr0, true); - init_target_desc (*tdesc); - -#ifndef IN_PROCESS_AGENT - static const char *expedite_regs_i386[] = { "ebp", "esp", "eip", NULL }; - (*tdesc)->expedite_regs = expedite_regs_i386; -#endif + init_target_desc (*tdesc, i386_expedite_regs); } return *tdesc;; @@ -124,12 +120,7 @@ amd64_linux_read_description (uint64_t xcr0, bool is_x32) { *tdesc = amd64_create_target_description (xcr0, is_x32, true); - init_target_desc (*tdesc); - -#ifndef IN_PROCESS_AGENT - static const char *expedite_regs_amd64[] = { "rbp", "rsp", "rip", NULL }; - (*tdesc)->expedite_regs = expedite_regs_amd64; -#endif + init_target_desc (*tdesc, amd64_expedite_regs); } return *tdesc; } diff --git a/gdb/gdbserver/lynx-i386-low.c b/gdb/gdbserver/lynx-i386-low.c index c7b4fe44e67..37c0dc97470 100644 --- a/gdb/gdbserver/lynx-i386-low.c +++ b/gdb/gdbserver/lynx-i386-low.c @@ -21,6 +21,7 @@ #include #include "x86-xstate.h" #include "arch/i386.h" +#include "x86-tdesc.h" /* The following two typedefs are defined in a .h file which is not in the standard include path (/sys/include/family/x86/ucontext.h), @@ -296,7 +297,7 @@ lynx_i386_arch_setup (void) struct target_desc *tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false); - init_target_desc (tdesc); + init_target_desc (tdesc, i386_expedite_regs); lynx_tdesc = tdesc; } diff --git a/gdb/gdbserver/nto-x86-low.c b/gdb/gdbserver/nto-x86-low.c index b15c208e770..81c3c6a7adb 100644 --- a/gdb/gdbserver/nto-x86-low.c +++ b/gdb/gdbserver/nto-x86-low.c @@ -25,6 +25,7 @@ #include #include "x86-xstate.h" #include "arch/i386.h" +#include "x86-tdesc.h" const unsigned char x86_breakpoint[] = { 0xCC }; #define x86_breakpoint_len 1 @@ -90,7 +91,7 @@ nto_x86_arch_setup (void) struct target_desc *tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false); - init_target_desc (tdesc); + init_target_desc (tdesc, i386_expedite_regs); nto_tdesc = tdesc; } diff --git a/gdb/gdbserver/tdesc.c b/gdb/gdbserver/tdesc.c index 92524b3dec8..d03508373b3 100644 --- a/gdb/gdbserver/tdesc.c +++ b/gdb/gdbserver/tdesc.c @@ -60,7 +60,8 @@ void target_desc::accept (tdesc_element_visitor &v) const } void -init_target_desc (struct target_desc *tdesc) +init_target_desc (struct target_desc *tdesc, + const char **expedite_regs) { int offset = 0; @@ -86,6 +87,10 @@ init_target_desc (struct target_desc *tdesc) /* Make sure PBUFSIZ is large enough to hold a full register packet. */ gdb_assert (2 * tdesc->registers_size + 32 <= PBUFSIZ); + +#ifndef IN_PROCESS_AGENT + tdesc->expedite_regs = expedite_regs; +#endif } struct target_desc * diff --git a/gdb/gdbserver/tdesc.h b/gdb/gdbserver/tdesc.h index 61a3e4ecdd2..989c12896ef 100644 --- a/gdb/gdbserver/tdesc.h +++ b/gdb/gdbserver/tdesc.h @@ -82,9 +82,11 @@ public: void copy_target_description (struct target_desc *dest, const struct target_desc *src); -/* Initialize TDESC. */ +/* Initialize TDESC, and then set its expedite_regs field to + EXPEDITE_REGS. */ -void init_target_desc (struct target_desc *tdesc); +void init_target_desc (struct target_desc *tdesc, + const char **expedite_regs); /* Return the current inferior's target description. Never returns NULL. */ diff --git a/gdb/gdbserver/win32-i386-low.c b/gdb/gdbserver/win32-i386-low.c index a242f7258af..16fe2c85b2a 100644 --- a/gdb/gdbserver/win32-i386-low.c +++ b/gdb/gdbserver/win32-i386-low.c @@ -24,6 +24,7 @@ #endif #include "arch/i386.h" #include "tdesc.h" +#include "x86-tdesc.h" #ifndef CONTEXT_EXTENDED_REGISTERS #define CONTEXT_EXTENDED_REGISTERS 0 @@ -436,11 +437,13 @@ i386_arch_setup (void) #ifdef __x86_64__ tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false, false); + const char **expedite_regs = amd64_expedite_regs; #else tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false); + const char **expedite_regs = i386_expedite_regs; #endif - init_target_desc (tdesc); + init_target_desc (tdesc, expedite_regs); win32_tdesc = tdesc; } diff --git a/gdb/gdbserver/x86-tdesc.h b/gdb/gdbserver/x86-tdesc.h new file mode 100755 index 00000000000..c1641b2760f --- /dev/null +++ b/gdb/gdbserver/x86-tdesc.h @@ -0,0 +1,26 @@ +/* Copyright (C) 2018 Free Software Foundation, Inc. + + This file is part of GDB. + + 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 3 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, see . */ + +#ifndef X86_TDESC_H + +/* The "expedite" registers for x86 targets. */ +static const char *i386_expedite_regs[] = {"ebp", "esp", "eip", NULL}; + +/* The "expedite" registers for x86_64 targets. */ +static const char *amd64_expedite_regs[] = {"rbp", "rsp", "rip", NULL}; + +#endif /* X86_TDESC_H */ diff --git a/gdb/regformats/regdat.sh b/gdb/regformats/regdat.sh index 8f546fe2769..5a8564ac50c 100755 --- a/gdb/regformats/regdat.sh +++ b/gdb/regformats/regdat.sh @@ -185,11 +185,10 @@ echo cat <expedite_regs = expedite_regs_${name}; result->xmltarget = xmltarget_${name}; #endif - init_target_desc (result); + init_target_desc (result, expedite_regs_${name}); tdesc_${name} = result; } -- 2.30.2