93a360cc5d
This test currently fails on ARM:
(gdb) PASS: gdb.dwarf2/dw2-dos-drive.exp: set breakpoint pending off
break 'z:file.c':func
Cannot access memory at address 0x0
The error is GDB trying to read the prologue at the breakpoint's
address, and failing:
38 throw_error() exceptions.c:444 0x0016728c
37 memory_error() corefile.c:204 0x001d1fcc
36 read_memory() corefile.c:223 0x001d201a
35 read_memory_unsigned_integer() corefile.c:312 0x001d2166
34 arm_skip_prologue() arm-tdep.c:1452 0x00054270
static CORE_ADDR
arm_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
{
...
for (skip_pc = pc; skip_pc < limit_pc; skip_pc += 4)
{
inst = read_memory_unsigned_integer (skip_pc, 4, byte_order_for_code);
The test doesn't execute the compiled object's code, so GDB will try
to read memory from the binary's sections. Instructions on ARM are
4-byte wide, and thus ARM's prologue scanner reads in 4-byte chunks.
As the section 'func' is put at is only 1 byte long, and no other
section is allocated contiguously:
...
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00000001 00000000 00000000 00000034 2**0
CONTENTS, ALLOC, LOAD, READONLY, CODE
...
... the exec target fails the read the 4 bytes.
Fix this by increasing the function's size.
gdb/testsuite/ChangeLog:
2014-01-16 Omair Javaid <Omair.Javaid@linaro.org>
* gdb.dwarf2/dw2-dos-drive.S: Increase text section size to 4
bytes.
76 lines
2.3 KiB
ArmAsm
76 lines
2.3 KiB
ArmAsm
/* Copyright 2013-2014 Free Software Foundation, Inc.
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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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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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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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.text
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pc_start:
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/* Enough space to fit at least one instruction. */
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.4byte 0
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pc_end:
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.section .debug_info
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d:
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.4byte .Ldebug_info_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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dieb:
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.uleb128 0x1 /* (DIE (0xb) DW_TAG_compile_unit) */
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.ascii "GCC\0" /* DW_AT_producer */
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.byte 0x2 /* DW_AT_language = DW_LANG_C */
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.ascii "z:file.c\0" /* DW_AT_name */
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.uleb128 0x2 /* (DIE (0xd3) DW_TAG_subprogram) */
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.byte 0x1 /* DW_AT_external */
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.ascii "func\0" /* DW_AT_name */
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.4byte pc_start /* DW_AT_low_pc */
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.4byte pc_end /* DW_AT_high_pc */
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.byte 0x1 /* DW_AT_prototyped */
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.byte 0x0 /* end of children of DIE 0xb */
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.Ldebug_info_end:
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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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.byte 0x0
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.byte 0x0
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.uleb128 0x2 /* (abbrev code) */
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.uleb128 0x2e /* (DW_TAG_subprogram) */
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.byte 0x0 /* DW_children_no */
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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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.uleb128 0x27 /* (DW_AT_prototyped) */
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.uleb128 0xc /* (DW_FORM_flag) */
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.byte 0x0
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.byte 0x0
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.byte 0x0
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