Fix internal error on DW_OP_bregx(-1) (RH BZ 1270564).
This commit is contained in:
Jan Kratochvil
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commit
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gdb-rhbz1270564-invalid-dwarf-regno.patch
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gdb-rhbz1270564-invalid-dwarf-regno.patch
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http://sourceware.org/ml/gdb-patches/2015-10/msg00166.html
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Subject: [patch] Fix internal error on DW_OP_bregx(-1)
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--ibTvN161/egqYuK8
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Content-Type: text/plain; charset=us-ascii
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Content-Disposition: inline
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Hi,
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https://bugzilla.redhat.com/show_bug.cgi?id=1270564#c15
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https://bugzilla.redhat.com/attachment.cgi?id=1081772
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clang-3.5.0-9.fc22.x86_64
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<3><22b2>: Abbrev Number: 69 (DW_TAG_variable)
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<22b3> DW_AT_location : 7 byte block: 92 ff ff ff ff f 0 (DW_OP_bregx: 4294967295 (r-1) 0)
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<22bb> DW_AT_name : (indirect string, offset: 0x2a36): texture_data
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<22c1> DW_AT_type : <0x1d3>
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(gdb) p variable
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warning: Unmapped DWARF Register #-1 encountered.
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regcache.c:177: internal-error: register_size: Assertion `regnum >= 0 && regnum < (gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch))' failed.
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[...]
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Quit this debugging session? (y or n) FAIL: gdb.dwarf2/dw2-regno-invalid.exp: p variable (GDB internal error)
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-> (x86_64)
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(gdb) p variable
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warning: Unmapped DWARF Register #-1 encountered.
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Invalid register #-1, expecting 0 <= # < 220
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(gdb) PASS: gdb.dwarf2/dw2-regno-invalid.exp: p variable
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-> (i386)
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(gdb) p variable
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Invalid register #104, expecting 0 <= # < 104
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(gdb) PASS: gdb.dwarf2/dw2-regno-invalid.exp: p variable
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GDB calls gdbarch_dwarf2_reg_to_regnum() first which returns -1 in the x86_64
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case
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if (regnum == -1)
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warning (_("Unmapped DWARF Register #%d encountered."), reg);
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but in i386 case it does:
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/* This will hopefully provoke a warning. */
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return gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
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and the default implementation is a nop, leaving whatever register number
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the DWARF specified.
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No regressions on {x86_64,x86_64-m32,i686}-fedorarawhide-linux-gnu.
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Jan
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--ibTvN161/egqYuK8
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Content-Type: text/plain; charset=us-ascii
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Content-Disposition: inline; filename="undefreg.patch"
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gdb/ChangeLog
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2015-10-12 Jan Kratochvil <jan.kratochvil@redhat.com>
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* findvar.c (address_from_register): Check REGNUM validity.
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gdb/testsuite/ChangeLog
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2015-10-12 Jan Kratochvil <jan.kratochvil@redhat.com>
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* gdb.dwarf2/dw2-regno-invalid.S: New file.
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* gdb.dwarf2/dw2-regno-invalid.exp: New file.
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diff --git a/gdb/findvar.c b/gdb/findvar.c
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index 0f46e53..855947d 100644
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--- a/gdb/findvar.c
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+++ b/gdb/findvar.c
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@@ -927,6 +927,12 @@ address_from_register (int regnum, struct frame_info *frame)
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struct type *type = builtin_type (gdbarch)->builtin_data_ptr;
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struct value *value;
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CORE_ADDR result;
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+ int regnum_max_excl = (gdbarch_num_regs (gdbarch)
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+ + gdbarch_num_pseudo_regs (gdbarch));
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+
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+ if (regnum < 0 || regnum >= regnum_max_excl)
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+ error (_("Invalid register #%d, expecting 0 <= # < %d"), regnum,
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+ regnum_max_excl);
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/* This routine may be called during early unwinding, at a time
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where the ID of FRAME is not yet known. Calling value_from_register
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diff --git a/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.S b/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.S
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new file mode 100644
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index 0000000..075bfd6
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--- /dev/null
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+++ b/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.S
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@@ -0,0 +1,91 @@
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+/* Copyright 2015 Free Software Foundation, Inc.
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+
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+ This program is free software; you can redistribute it and/or modify
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+ it under the terms of the GNU General Public License as published by
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+ the Free Software Foundation; either version 3 of the License, or
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+ (at your option) any later version.
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+
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+ This program is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ GNU General Public License for more details.
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+
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+ You should have received a copy of the GNU General Public License
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+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
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+
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+ .section .debug_info
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+debug_start:
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+ .4byte debug_end - 1f /* Length of Compilation Unit Info */
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+1:
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+ .2byte 0x3 /* DWARF version number */
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+ .4byte .Ldebug_abbrev0 /* Offset Into Abbrev. Section */
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+ .byte 0x4 /* Pointer Size (in bytes) */
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+ .uleb128 0x1 /* (DIE (0xb) DW_TAG_compile_unit) */
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+ .ascii "clang-3.5.0-9.fc22.x86_64\0" /* DW_AT_producer */
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+ .byte 0x1 /* DW_AT_language */
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+ .ascii "1.c\0" /* DW_AT_name */
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+ .4byte main_label /* DW_AT_low_pc */
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+ .4byte main_label+0x10000 /* DW_AT_high_pc */
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+
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+ .uleb128 2 /* Abbrev: DW_TAG_subprogram */
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+ .byte 1 /* DW_AT_external */
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+ .ascii "main\0" /* DW_AT_name */
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+ .4byte main_label /* DW_AT_low_pc */
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+ .4byte main_label+0x10000 /* DW_AT_high_pc */
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+
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+ .uleb128 0x4 /* (DW_TAG_variable) */
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+ .ascii "variable\0" /* DW_AT_name */
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+ .2byte 2f - 1f /* DW_AT_location: DW_FORM_block2 */
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+1:
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+ .byte 0x92 /* DW_OP_bregx */
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+ .uleb128 0xffffffff
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+ .sleb128 0
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+2:
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+
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+ .byte 0x0 /* end of children of main */
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+ .byte 0x0 /* end of children of CU */
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+debug_end:
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+
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+ .section .debug_abbrev
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+.Ldebug_abbrev0:
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+ .uleb128 0x1 /* (abbrev code) */
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+ .uleb128 0x11 /* (TAG: DW_TAG_compile_unit) */
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+ .byte 0x1 /* DW_children_yes */
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+ .uleb128 0x25 /* (DW_AT_producer) */
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+ .uleb128 0x8 /* (DW_FORM_string) */
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+ .uleb128 0x13 /* (DW_AT_language) */
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+ .uleb128 0xb /* (DW_FORM_data1) */
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+ .uleb128 0x3 /* (DW_AT_name) */
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+ .uleb128 0x8 /* (DW_FORM_string) */
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+ .uleb128 0x11 /* DW_AT_low_pc */
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+ .uleb128 0x1 /* DW_FORM_addr */
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+ .uleb128 0x12 /* DW_AT_high_pc */
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+ .uleb128 0x1 /* DW_FORM_addr */
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+ .byte 0x0
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+ .byte 0x0
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+
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+ .uleb128 2 /* Abbrev code */
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+ .uleb128 0x2e /* DW_TAG_subprogram */
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+ .byte 1 /* has_children */
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+ .uleb128 0x3f /* DW_AT_external */
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+ .uleb128 0xc /* DW_FORM_flag */
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+ .uleb128 0x3 /* DW_AT_name */
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+ .uleb128 0x8 /* DW_FORM_string */
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+ .uleb128 0x11 /* DW_AT_low_pc */
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+ .uleb128 0x1 /* DW_FORM_addr */
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+ .uleb128 0x12 /* DW_AT_high_pc */
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+ .uleb128 0x1 /* DW_FORM_addr */
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+ .byte 0x0 /* Terminator */
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+ .byte 0x0 /* Terminator */
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+
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+
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+ .uleb128 0x4 /* (abbrev code) */
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+ .uleb128 0x34 /* (TAG: DW_TAG_variable) */
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+ .byte 0x0 /* DW_children_yes */
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+ .uleb128 0x3 /* (DW_AT_name) */
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+ .uleb128 0x8 /* (DW_FORM_string) */
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+ .uleb128 0x02 /* (DW_AT_location) */
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+ .uleb128 0x3 /* (DW_FORM_block2) */
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+ .byte 0x0
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+ .byte 0x0
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+ .byte 0x0
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diff --git a/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.exp b/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.exp
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new file mode 100644
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index 0000000..7c3a404
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--- /dev/null
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+++ b/gdb/testsuite/gdb.dwarf2/dw2-regno-invalid.exp
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@@ -0,0 +1,32 @@
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+# Copyright 2015 Free Software Foundation, Inc.
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+
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation; either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+load_lib dwarf.exp
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+
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+# This test can only be run on targets which support DWARF-2 and use gas.
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+if {![dwarf2_support]} {
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+ return 0
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+}
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+
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+standard_testfile .S main.c
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+
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+if { [gdb_compile "${srcdir}/${subdir}/${srcfile} ${srcdir}/${subdir}/${srcfile2}" \
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+ "${binfile}" executable {}] != "" } {
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+ return -1
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+}
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+
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+clean_restart ${binfile}
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+runto_main
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+
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+gdb_test "p variable"
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--ibTvN161/egqYuK8--
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9
gdb.spec
9
gdb.spec
@ -27,7 +27,7 @@ Version: 7.10
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# The release always contains a leading reserved number, start it at 1.
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# `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
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Release: 28%{?dist}
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Release: 29%{?dist}
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License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain and GFDL
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Group: Development/Debuggers
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@ -553,6 +553,9 @@ Patch1031: gdb-rhbz1260558-ppc64le-skip_trampoline_code.patch
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# Fix the pahole command breakage due to its Python3 port (RH BZ 1264532).
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Patch1044: gdb-pahole-python2.patch
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# Fix internal error on DW_OP_bregx(-1) (RH BZ 1270564).
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Patch1052: gdb-rhbz1270564-invalid-dwarf-regno.patch
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%if 0%{!?rhel:1} || 0%{?rhel} > 6
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# RL_STATE_FEDORA_GDB would not be found for:
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# Patch642: gdb-readline62-ask-more-rh.patch
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@ -851,6 +854,7 @@ find -name "*.info*"|xargs rm -f
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%patch1029 -p1
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%patch1030 -p1
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%patch1031 -p1
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%patch1052 -p1
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%patch848 -p1
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%if 0%{!?el6:1}
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@ -1366,6 +1370,9 @@ then
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fi
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%changelog
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* Mon Oct 12 2015 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.10-29.fc23
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- Fix internal error on DW_OP_bregx(-1) (RH BZ 1270564).
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* Mon Sep 28 2015 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.10-28.fc23
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- Add --with buildisa, remove %%{?_isa} from BuildRequires by default:
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https://github.com/msimacek/koschei/issues/54
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