Rollup merge of rust-lang#121683 - fortanix:raoul/lvi_fixes, r=cuviper

Fix LVI tests after frame pointers are enabled by default

rust-lang#121203 enables frame pointers by default. This affects LVI mitigations for the `x86_64-fortanix-unknown-sgx` target. LVI remained mitigated correctly, but the tests were too strict.

``@nshyrei`` , ``@jethrogb``

tests/run-make/x86_64-fortanix-unknown-sgx-lvi/cmake_plus_one_cxx_global_asm.checks

@@ -1,2 +1,7 @@
 CHECK: cmake_plus_one_cxx_global_asm
-CHECK: lfence
+CHECK-NEXT: movl
+CHECK-NEXT: lfence
+CHECK-NEXT: incl
+CHECK-NEXT: shlq    $0x0, (%rsp)
+CHECK-NEXT: lfence
+CHECK-NEXT: retq

tests/run-make/x86_64-fortanix-unknown-sgx-lvi/print.with_frame_pointers.checks

@@ -0,0 +1,7 @@
+CHECK: print
+CHECK:      lfence
+CHECK:      popq
+CHECK:      popq
+CHECK-NEXT: popq [[REGISTER:%[a-z]+]]
+CHECK-NEXT: lfence
+CHECK-NEXT: jmpq *[[REGISTER]]

tests/run-make/x86_64-fortanix-unknown-sgx-lvi/script.sh

@@ -34,8 +34,9 @@ function check {
       ${enclave} > ${asm}
     ${filecheck} --input-file ${asm} ${checks}
 
-    if [ "${func_re}" != "rust_plus_one_global_asm" &&
-         "${func_re}" != "cmake_plus_one_c_global_asm" ]; then
+    if [ "${func_re}" != "rust_plus_one_global_asm" ] &&
+         [ "${func_re}" != "cmake_plus_one_c_global_asm" ] &&
+         [ "${func_re}" != "cmake_plus_one_cxx_global_asm" ]; then
         # The assembler cannot avoid explicit `ret` instructions. Sequences
         # of `shlq $0x0, (%rsp); lfence; retq` are used instead.
         # https://www.intel.com/content/www/us/en/developer/articles/technical/
@@ -48,7 +49,8 @@ build
 
 check "unw_getcontext" unw_getcontext.checks
 check "__libunwind_Registers_x86_64_jumpto" jumpto.checks
-check 'std::io::stdio::_print::[[:alnum:]]+' print.checks
+check 'std::io::stdio::_print::[[:alnum:]]+' print.with_frame_pointers.checks ||
+    check 'std::io::stdio::_print::[[:alnum:]]+' print.without_frame_pointers.checks
 check rust_plus_one_global_asm rust_plus_one_global_asm.checks
 
 check cc_plus_one_c cc_plus_one_c.checks