https://sourceware.org/bugzilla/show_bug.cgi?id=24991
Bug ID: 24991
Summary: the assembler generates incorrect offset for jumps on
arm thumb2
Product: binutils
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: mikulas at artax dot karlin.mff.cuni.cz
Target Milestone: ---
Created attachment 11985
--> https://sourceware.org/bugzilla/attachment.cgi?id=11985&action=edit
a test file
Compile the attached file without optimizations and run it. You'll get a crash:
$ arm-linux-gnueabihf-gcc -mthumb long.c
$ ./a.out
Segmentation fault (core dumped)
If you look at the assembler output, you'll see that the beq.w instruction that
is supposed to jump over the function body points backwards.
0000050c <f>:
50c: b580 push {r7, lr}
50e: b082 sub sp, #8
510: af00 add r7, sp, #0
512: 6078 str r0, [r7, #4]
514: 687b ldr r3, [r7, #4]
516: 2b00 cmp r3, #0
518: f406 8e45 beq.w fff871a6 <__bss_end__+0xffdef15e>
<<<<<<< BUG
51c: f8df 3ffc ldr.w r3, [pc, #4092] ; 151c <f+0x1010>
520: 447b add r3, pc
522: 4618 mov r0, r3
524: f7ff ef52 blx 3cc <puts@plt>
528: f8df 3ff4 ldr.w r3, [pc, #4084] ; 1520 <f+0x1014>
52c: 447b add r3, pc
52e: 4618 mov r0, r3
530: f7ff ef4c blx 3cc <puts@plt>
534: f8df 3fec ldr.w r3, [pc, #4076] ; 1524 <f+0x1018>
538: 447b add r3, pc
53a: 4618 mov r0, r3
53c: f7ff ef46 blx 3cc <puts@plt>
540: f8df 3fe4 ldr.w r3, [pc, #4068] ; 1528 <f+0x101c>
544: 447b add r3, pc
546: 4618 mov r0, r3
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