From 8f34b74686c6b9bf83d1c46e93b5aecca2e0ed0e Mon Sep 17 00:00:00 2001 From: Tom de Vries Date: Mon, 3 Aug 2020 16:59:20 +0200 Subject: [gdb/symtab] Ignore DW_LNE_lo_user/DW_LNE_hi_user range When reading an exec with a .debug_line section containing a vendor-specific extended opcode, we get: ... $ gdb -batch -iex "set complaints 10" dw2-vendor-extended-opcode During symbol reading: mangled .debug_line section ... and reading of the .debug_line section is abandoned. The vendor-specific extended opcode should be ignored, as specified in the DWARF standard (7.1 Vendor Extensibility). [ FWIW, vendor-specific standard opcodes are already ignored. ] Fix this by ignoring all vendor-specific extended opcodes. Build and tested on x86_64-linux. gdb/ChangeLog: 2020-08-03 Tom de Vries PR symtab/26333 * dwarf2/read.c (dwarf_decode_lines_1): Ignore DW_LNE_lo_user/DW_LNE_hi_user range. gdb/testsuite/ChangeLog: 2020-08-03 Tom de Vries PR symtab/26333 * lib/dwarf.exp (DW_LNE_user): New proc. * gdb.dwarf2/dw2-vendor-extended-opcode.c: New test. * gdb.dwarf2/dw2-vendor-extended-opcode.exp: New file. --- gdb/ChangeLog | 6 ++ gdb/dwarf2/read.c | 7 ++ gdb/testsuite/ChangeLog | 7 ++ .../gdb.dwarf2/dw2-vendor-extended-opcode.c | 32 +++++++++ .../gdb.dwarf2/dw2-vendor-extended-opcode.exp | 81 ++++++++++++++++++++++ gdb/testsuite/lib/dwarf.exp | 16 +++++ 6 files changed, 149 insertions(+) create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.c create mode 100644 gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.exp diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 9e71836..276fa64 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,9 @@ +2020-08-03 Tom de Vries + + PR symtab/26333 + * dwarf2/read.c (dwarf_decode_lines_1): Ignore + DW_LNE_lo_user/DW_LNE_hi_user range. + 2020-07-30 Simon Marchi PR ada/26318 diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c index 4e70dcc..bcbffbf 100644 --- a/gdb/dwarf2/read.c +++ b/gdb/dwarf2/read.c @@ -20591,6 +20591,13 @@ dwarf_decode_lines_1 (struct line_header *lh, struct dwarf2_cu *cu, extended_end = line_ptr + extended_len; extended_op = read_1_byte (abfd, line_ptr); line_ptr += 1; + if (DW_LNE_lo_user <= extended_op + && extended_op <= DW_LNE_hi_user) + { + /* Vendor extension, ignore. */ + line_ptr = extended_end; + break; + } switch (extended_op) { case DW_LNE_end_sequence: diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index 29dc46a..1e1b702 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,10 @@ +2020-08-03 Tom de Vries + + PR symtab/26333 + * lib/dwarf.exp (DW_LNE_user): New proc. + * gdb.dwarf2/dw2-vendor-extended-opcode.c: New test. + * gdb.dwarf2/dw2-vendor-extended-opcode.exp: New file. + 2020-07-31 Kevin Buettner * gdb.base/coremaker2.c: Change all uses of 'unsigned long long' diff --git a/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.c b/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.c new file mode 100644 index 0000000..97e019b --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.c @@ -0,0 +1,32 @@ +/* This testcase is part of GDB, the GNU debugger. + + Copyright 2020 Free Software Foundation, Inc. + + 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 . */ + +void +foo (void) +{ + +} + +int +main() +{ + asm ("main_label: .globl main_label"); + foo (); + + asm ("main_label_2: .globl main_label_2"); + return 0; +} diff --git a/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.exp b/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.exp new file mode 100644 index 0000000..92db7ea --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/dw2-vendor-extended-opcode.exp @@ -0,0 +1,81 @@ +# Copyright 2020 Free Software Foundation, Inc. + +# 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 . +load_lib dwarf.exp + +# This test can only be run on targets which support DWARF-2 and use gas. +if {![dwarf2_support]} { + verbose "Skipping dw2-vendor-extended-opcode test." + return 0 +} + +# The .c files use __attribute__. +if [get_compiler_info] { + return -1 +} +if !$gcc_compiled { + verbose "Skipping dw2-vendor-extended-opcode test." + return 0 +} + +standard_testfile dw2-vendor-extended-opcode.c dw2-vendor-extended-opcode-dw.S + +set asm_file [standard_output_file $srcfile2] +Dwarf::assemble $asm_file { + declare_labels Llines + global srcdir subdir srcfile + + set DW_LNE_lo_usr 0x80 + set DW_LNE_hi_usr 0xff + + cu {} { + compile_unit { + {language @DW_LANG_C} + {name dw2-vendor-extended-opcode.c} + {stmt_list $Llines DW_FORM_sec_offset} + } { + subprogram { + {external 1 flag} + {MACRO_AT_func {main}} + } + } + } + + lines {version 2} Llines { + include_dir "${srcdir}/${subdir}" + file_name "$srcfile" 1 + + program { + {DW_LNE_set_address main_label} + {line 27} + {DW_LNE_user 1 $DW_LNE_lo_usr} + {DW_LNE_user 2 $DW_LNE_hi_usr} + {DW_LNS_copy} + + {DW_LNE_set_address main_label_2} + {DW_LNE_end_sequence} + } + } +} + +if { [prepare_for_testing "failed to prepare" ${testfile} \ + [list $srcfile $asm_file] {nodebug}] } { + return -1 +} + +if ![runto_main] { + return -1 +} + +gdb_breakpoint "$srcfile:27" message diff --git a/gdb/testsuite/lib/dwarf.exp b/gdb/testsuite/lib/dwarf.exp index ee625c9..5c84063 100644 --- a/gdb/testsuite/lib/dwarf.exp +++ b/gdb/testsuite/lib/dwarf.exp @@ -1449,6 +1449,22 @@ namespace eval Dwarf { set _line 1 } + proc DW_LNE_user { len opcode } { + set DW_LNE_lo_usr 0x80 + set DW_LNE_hi_usr 0xff + if { $DW_LNE_lo_usr <= $opcode + && $opcode <= $DW_LNE_hi_usr } { + _op .byte 0 + _op .uleb128 $len + _op .byte $opcode + for {set i 1} {$i < $len} {incr i} { + _op .byte 0 + } + } else { + error "unknown vendor specific extended opcode: $opcode" + } + } + proc DW_LNS_copy {} { _op .byte 1 } -- cgit v1.1