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[PAL/Linux-SGX] AEX-Notify 4/5: Do not clobber RBX reg in stage-1 signal handler #2036

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[PAL/Linux-SGX] AEX-Notify 4/5: Do not clobber RBX reg in stage-1 signal handler #2036

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6 changes: 3 additions & 3 deletions pal/src/host/linux-sgx/enclave_entry.S
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Original file line number Diff line number Diff line change
Expand Up @@ -531,8 +531,8 @@ enclave_entry:
movq %rdi, SGX_GPR_RIP(%rbx)

# copy the whole SSA[0].XSAVE region to the CPU context's XSAVE on stack;
# __restore_xregs / __save_xregs clobber RDX so need to stash it in RBX
movq %rdx, %rbx
# __restore_xregs / __save_xregs clobber RDX so need to stash it in R10
movq %rdx, %r10
movq %gs:SGX_SSA, %rdi
leaq 1f(%rip), %r11
jmp __restore_xregs
Expand All @@ -541,7 +541,7 @@ enclave_entry:
leaq 2f(%rip), %r11
jmp __save_xregs
2:
movq %rbx, %rdx
movq %r10, %rdx

.Lcssa1_exception_eexit:
# .Lcssa0_ocall_or_cssa1_exception_eexit has an ABI that uses RSI, RDI, RSP; clear the relevant
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