http://llvm.org/bugs/show_bug.cgi?id=21997
Bug ID: 21997
Summary: missassembly of call to aligned local symbol
Product: tools
Version: trunk
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: llvm-as
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13583
--> http://llvm.org/bugs/attachment.cgi?id=13583&action=edit
foo.s: example of bug; bar.s: fixed by moving L downstream
when .balign is applied to a local label in the text section, and that symbol
is called at a later point in the same assembly file, the assembler appears to
generate an incorrect relocation that causes a bad pc to be formed by the call.
the result is a bus error. the bug seems not to occur if the aligned local
symbol is downstream of
the call site.
I've attached a small test case that reproduces the behavior. here's the
offending code:
.globl _main
.text
.balign 1<<4, 0x90
L:
ret
_main:
call L // gets a bad pc for L
xorq %rax, %rax
ret
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