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[compiler-rt][XRay] Stash xmm registers in the trampolines 

We now stash and restore the xmm registers in the trampolines so that
log handlers don't need to worry about clobbering these registers.

In response to comments in D21612.

Reviewers: rSerge, eugenis, echristo, rnk

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D23051

llvm-svn: 277683
This commit is contained in:
Dean Michael Berris 2016-08-04 00:09:35 +00:00
parent 7e49549d4f
commit 3c86ed7f60
1 changed files with 24 additions and 5 deletions
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29
compiler-rt/lib/xray/xray_trampoline_x86.S
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@ -24,7 +24,15 @@ __xray_FunctionEntry:
// Save caller provided registers before doing any actual work.
pushq %rbp
.cfi_def_cfa_offset 16
subq $72, %rsp
subq $200, %rsp
movupd %xmm0, 184(%rsp)
movupd %xmm1, 168(%rsp)
movupd %xmm2, 152(%rsp)
movupd %xmm3, 136(%rsp)
movupd %xmm4, 120(%rsp)
movupd %xmm5, 104(%rsp)
movupd %xmm6, 88(%rsp)
movupd %xmm7, 72(%rsp)
movq %rdi, 64(%rsp)
movq %rax, 56(%rsp)
movq %rdx, 48(%rsp)
@ -45,6 +53,14 @@ __xray_FunctionEntry:
callq *%rax
.Ltmp0:
// restore the registers
movupd 184(%rsp), %xmm0
movupd 168(%rsp), %xmm1
movupd 152(%rsp), %xmm2
movupd 136(%rsp), %xmm3
movupd 120(%rsp), %xmm4
movupd 104(%rsp), %xmm5
movupd 88(%rsp) , %xmm6
movupd 72(%rsp) , %xmm7
movq 64(%rsp), %rdi
movq 56(%rsp), %rax
movq 48(%rsp), %rdx
@ -52,7 +68,7 @@ __xray_FunctionEntry:
movq 32(%rsp), %rcx
movq 24(%rsp), %r8
movq 16(%rsp), %r9
addq $72, %rsp
addq $200, %rsp
popq %rbp
retq
.Ltmp1:
@ -67,11 +83,12 @@ __xray_FunctionExit:
// Save the important registers first. Since we're assuming that this
// function is only jumped into, we only preserve the registers for
// returning.
// FIXME: Figure out whether this is sufficient.
pushq %rbp
.cfi_def_cfa_offset 16
subq $24, %rsp
subq $56, %rsp
.cfi_def_cfa_offset 32
movupd %xmm0, 40(%rsp)
movupd %xmm1, 24(%rsp)
movq %rax, 16(%rsp)
movq %rdx, 8(%rsp)
movq _ZN6__xray19XRayPatchedFunctionE(%rip), %rax
@ -83,9 +100,11 @@ __xray_FunctionExit:
callq *%rax
.Ltmp2:
// Restore the important registers.
movupd 40(%rsp), %xmm0
movupd 24(%rsp), %xmm1
movq 16(%rsp), %rax
movq 8(%rsp), %rdx
addq $24, %rsp
addq $56, %rsp
popq %rbp
retq
.Ltmp3: