https://bugs.llvm.org/show_bug.cgi?id=34831
Bug ID: 34831
Summary: Allow to select the segment and offset of the stack
canary
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: thgar...@google.com
CC: llvm-bugs@lists.llvm.org
Mirror the behaviour from gcc:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81708
The Linux and Zircon/Magenta kernel is moving to PIE code generation on x86. It
means using -fPIE and removing -mcmodel=kernel. The problem is that
-mcmodel=kernel is used to switch the TLS segment from fs to gs (for stack
cookie or stack-guard on clang).
Gcc went for this format and using the same would be useful:
-mstack-protector-guard-reg=%fs -mstack-protector-guard-offset=0x200
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