http://sourceware.org/bugzilla/show_bug.cgi?id=13214
Bug #: 13214
Summary: Gold does emit mapping symbols for stubs
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gold
AssignedTo: i...@airs.com
ReportedBy: mgret...@sourceware.org
Classification: Unclassified
Target: arm-none-eabi
Given the following testcase:
@tmp.s
.syntax unified
.thumb
.section sect1, "ax"
.globl _start
_start:
bl bar
.section sect2, "ax"
.globl bar
.arm
bar:
bx lr
@end of tmp.s
Doing the following:
arm-none-eabi-as -march=armv5t tmp.s -o tmp.o
arm-none-eabi-ld.gold tmp.o -o tmp --section-start sect2=0x1000 \
--section-start sect1=0x04000000
arm-none-eabi-objdump -d tmp
Produces the following output:
00001000 <_start>:
1000: f000 e800 blx 1004 <_start+0x4>
1004: f004 e51f ; <UNDEFINED> instruction:
0xf004e51f
1008: 0000 movs r0, r0
100a: 0400 lsls r0, r0, #16
The instruction at 0x1004 is actually an ARM instruction (and so should have a
$a mapping symbol). The 'instructions' at 0x1008 and 0x100a are actually a
word of data, and so should have a $d mapping symbol.
Not emitting these mapping symbols is technically in contravention of the ABI,
and makes disassembly harder to read, but in the majority of cases won't impact
correct execution of images.
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