libunwind: Enable more tests to run on FreeBSD

While at it, replace "echo -ne" with "printf" for more compatibility.

Author: arrowd

libunwind/test/bad_unwind_info.pass.cpp

@@ -10,7 +10,7 @@
 // Ensure that libunwind doesn't crash on invalid info; the Linux aarch64
 // sigreturn frame check would previously attempt to access invalid memory in
 // this scenario.
-// REQUIRES: target={{(aarch64|s390x|x86_64)-.+linux.*}}
+// REQUIRES: target={{(aarch64|s390x|x86_64)-.+(linux|freebsd).*}}
 
 // GCC doesn't support __attribute__((naked)) on AArch64.
 // UNSUPPORTED: gcc

libunwind/test/eh_frame_fde_pc_range.pass.cpp

@@ -13,15 +13,15 @@
 
 // clang-format off
 
-// REQUIRES: target={{x86_64-.+-linux-gnu}}
+// REQUIRES: target={{x86_64-.+-(linux-gnu|freebsd.*)}}
 // REQUIRES: objcopy-available
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan
 
 // RUN: %{build}
 // RUN: %{objcopy} --dump-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
-// RUN: echo -ne '\xFF' | dd of=%t_ehf_hdr.bin bs=1 seek=2 count=2 conv=notrunc status=none
+// RUN: printf '\377' | dd of=%t_ehf_hdr.bin bs=1 seek=2 count=2 conv=notrunc status=none
 // RUN: %{objcopy} --update-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
 // RUN: %{exec} %t.exe
 

libunwind/test/forceunwind.pass.cpp

@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-// REQUIRES: linux
+// REQUIRES: linux || freebsd
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan

libunwind/test/remember_state_leak.pass.sh.s

@@ -6,7 +6,7 @@
 #
 #===------------------------------------------------------------------------===#
 
-# REQUIRES: target={{x86_64-.+-linux-gnu}}
+# REQUIRES: target={{x86_64-.+-(linux-gnu|freebsd.*)}}
 
 # Inline assembly isn't supported by Memory Sanitizer
 # UNSUPPORTED: msan

libunwind/test/signal_unwind.pass.cpp

@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 // Ensure that the unwinder can cope with the signal handler.
-// REQUIRES: target={{(aarch64|loongarch64|riscv64|s390x|x86_64)-.+linux.*}}
+// REQUIRES: target={{(aarch64|loongarch64|riscv64|s390x|x86_64)-.+(linux|freebsd).*}}
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan

libunwind/test/unwind_leaffunction.pass.cpp

@@ -8,7 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 // Ensure that leaf function can be unwund.
-// REQUIRES: target={{(aarch64|loongarch64|riscv64|s390x|x86_64)-.+linux.*}}
+// REQUIRES: target={{(aarch64|loongarch64|riscv64|s390x|x86_64)-.+(linux|freebsd).*}}
 
 // TODO: Figure out why this fails with Memory Sanitizer.
 // XFAIL: msan