https://bugs.llvm.org/show_bug.cgi?id=37608
Bug ID: 37608
Summary: LLD does not update section start address
Product: lld
Version: unspecified
Hardware: Other
OS: other
Status: NEW
Severity: normal
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: eblot...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20346
--> https://bugs.llvm.org/attachment.cgi?id=20346&action=edit
Sample code to reproduce the issue
Hi,
Using LLD 6.0.0 (host: macOS, target: armv7em bare metal), it seems LLD fails
to properly compute the start address of some of the successive sections, for
example in the following subset:
.pstack :
{
. = ALIGN(8);
__process_stack_base__ = .;
. += __process_stack_size__;
. = ALIGN(8);
__process_stack_end__ = .;
} > ram0
.mstack :
{
. = ALIGN(8);
__main_stack_base__ = .;
. += __main_stack_size__;
. = ALIGN(8);
__main_stack_end__ = .;
} > ram0
I expect that __main_stack_base__ is given an address equal of greater than
__process_stack_end__.
However:
Stack map with LLVM/LLD
20000000 B __main_stack_base__
20000000 B __process_stack_base__
While:
Stack map with GNU/LD
20000400 B __main_stack_base__
20000000 B __process_stack_base__
The proper address can be obtained by forcing the start address this way:
.mstack :
{
. = __process_stack_end__;
. = ALIGN(8);
__main_stack_base__ = .;
. += __main_stack_size__;
. = ALIGN(8);
__main_stack_end__ = .;
} > ram0
but it seems awkward.
I'm attaching a tiny tarball file w/ a build.sh script that reproduces the
issue with a very trivial application.
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