Package: binutils-gold
Version: 2.23.1-1~exp3
Severity: important
Tags: upstream
ehdr here is only 16-bit aligned (0x405a7536 % 4 == 2), which comes from
#1 0x0008ce74 in Elf_file (file=0xbe89bfc8, this=0xbe89bf68)
at ../../gold/../elfcpp/elfcpp_file.h:397
whch is using an offset into the open file.
encountered building chromium, but I was unable to build anything without
turning on
unaligned fault fixup (echo 2 > /proc/cpu/alignment)
invocation: gdb --args g++-4.6.real -pthread -Wl,-z,noexecstack -fPIC -Wl,-O1
-Wl,--as-needed -Wl,--gc-sections -o out/Release/mksnapshot -Wl,--start-group
out/Release/obj.host/mksnapshot/v8/src/mksnapshot.o
out/Release/obj.host/v8/tools/gyp/libv8_base.a
out/Release/obj.host/v8/tools/gyp/libv8_nosnapshot.a -Wl,--end-group
then: set follow-fork-mode child
Dump of assembler code for function elfcpp::Elf_file<32, false,
gold::Sniff_file>::construct(gold::Sniff_file*, elfcpp::Ehdr<32, false> const&):
0x0002f4a4 <+0>: ldr r3, [r2]
0x0002f4a8 <+4>: push {r4, r5, r6, r7, r8, lr}
0x0002f4ac <+8>: ldrh r7, [r3, #40] ; 0x28
=> 0x0002f4b0 <+12>: ldr r6, [r3, #32]
0x0002f4b4 <+16>: ldrh r12, [r3, #48] ; 0x30
0x0002f4b8 <+20>: mov r4, r2
0x0002f4bc <+24>: ldrh r2, [r3, #50] ; 0x32
0x0002f4c0 <+28>: mov r8, #0
0x0002f4c4 <+32>: cmp r7, #52 ; 0x34
0x0002f4c8 <+36>: mov r5, r1
0x0002f4cc <+40>: str r1, [r0]
0x0002f4d0 <+44>: str r6, [r0, #8]
0x0002f4d4 <+48>: str r8, [r0, #12]
0x0002f4d8 <+52>: str r12, [r0, #16]
0x0002f4dc <+56>: str r2, [r0, #20]
0x0002f4e0 <+60>: str r8, [r0, #24]
(gdb) info registers
r0 0xbe89bf70 3196698480
r1 0xbe89bfd0 3196698576
r2 0xbe89bff8 3196698616
r3 0x405a7536 1079670070
r4 0x536 1334
r5 0x0 0
r6 0x20 32
r7 0x34 52
r8 0x27d0dc 2609372
r9 0x0 0
r10 0x536 1334
r11 0x0 0
r12 0x0 0
sp 0xbe89bf20 0xbe89bf20
lr 0x8ce74 577140
pc 0x2f4b0 0x2f4b0 <elfcpp::Elf_file<32, false,
gold::Sniff_file>::construct(gold::Sniff_file*, elfcpp::Ehdr<32, false>
const&)+12>
cpsr 0x60000010 1610612752
(gdb) bt full
#0 elfcpp::Elf_file<32, false, gold::Sniff_file>::construct (this=0xbe89bf70,
file=0xbe89bfd0,
ehdr=...) at ../../gold/../elfcpp/elfcpp_file.h:378
No locals.
#1 0x0008ce74 in Elf_file (file=0xbe89bfc8, this=0xbe89bf68)
at ../../gold/../elfcpp/elfcpp_file.h:397
No locals.
#2 do_recognize_nacl_file<32, false> (offset=1334, input_file=<optimized out>,
this=0x27d0dc)
at ../../gold/nacl.h:198
file = {file_ = @0xd14a30, offset_ = 1334}
elf_file = {static ehdr_size = <optimized out>, static phdr_size =
<optimized out>,
static shdr_size = <optimized out>, static sym_size = <optimized
out>,
static rel_size = <optimized out>, static rela_size = <optimized
out>, file_ = 0x0,
shoff_ = 3845902709115484, shnum_ = 13716016, shstrndx_ = 13712800,
large_shndx_offset_ = 13716016}
shnum = <optimized out>
#3 recognize_nacl_file (offset=1334, input_file=<optimized out>, this=0x27d0dc)
at ../../gold/nacl.h:182
No locals.
#4 gold::Target_selector_nacl<{anonymous}::Target_selector_arm<false>,
{anonymous}::Target_arm_nacl<false> >::do_recognize(gold::Input_file *, off_t,
int, int, int) (this=0x27d0dc,
file=<optimized out>, offset=<optimized out>, machine=40, osabi=0,
abiversion=0)
at ../../gold/nacl.h:116
No locals.
#5 0x001e9470 in recognize (abiversion=0, osabi=32, machine=2622660,
offset=1334,
input_file=0xd14a28, this=0x27d0dc) at ../../gold/target-select.h:83
No locals.
#6 gold::select_target (input_file=0xd14a28, offset=<optimized out>,
machine=40, size=32,
is_big_endian=false, osabi=0, abiversion=0) at
../../gold/target-select.cc:114
ret = <optimized out>
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