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[XRay][compiler-rt] Stash flags as well in x86_64 trampoline 

Summary:
This change saves and restores the full flags register in x86_64 mode.
This makes running instrumented signal handlers safer, and avoids flags
set during the execution of the event handlers from polluting the
instrumented call's flags state.

Reviewers: kpw, eizan, jfb

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D51277

llvm-svn: 340812
This commit is contained in:
Dean Michael Berris 2018-08-28 10:32:50 +00:00
parent 6a5c01c7e9
commit bb6aa92c31
1 changed files with 2 additions and 0 deletions
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2
compiler-rt/lib/xray/xray_trampoline_x86_64.S
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@ -19,6 +19,7 @@
.macro SAVE_REGISTERS
pushfq
subq $240, %rsp
CFI_DEF_CFA_OFFSET(248)
movq %rbp, 232(%rsp)
@ -69,6 +70,7 @@
movq 8(%rsp), %r14
movq 0(%rsp), %r15
addq $240, %rsp
popfq
CFI_DEF_CFA_OFFSET(8)
.endm