[safestack] Enable loongarch64

[tangyouling]

Summary

Enable safestack on loongarch64.

Some test cases will fail on loongarch, it will be fixed in glibc,
Links: https://sourceware.org/pipermail/libc-alpha/2022-November/143641.html

[tangyouling]

$ make check-safestack
Testing Time: 1.48s
  Unsupported: 1
  Passed     : 8

2 warning(s) in tests
[100%] Built target check-safestack

[vitalybuka]

compiler-rt/lib/safestack/safestack_platform.h

100 ↗

(On Diff #480731)

I can be too early for libc call, syscall should be used here

[tangyouling]

compiler-rt/lib/safestack/safestack_platform.h

100 ↗

(On Diff #480731)

I can be too early for libc call, syscall should be used here

Under the current glibc, if syscall is used, the test will fail on loongarch.
It is of course possible to wait for the glibc fix patch to be merged in and just enable safestack without making this change.

[xen0n]

compiler-rt/lib/safestack/safestack_platform.h

100 ↗

(On Diff #480731)

I can be too early for libc call, syscall should be used here

Under the current glibc, if syscall is used, the test will fail on loongarch.
It is of course possible to wait for the glibc fix patch to be merged in and just enable safestack without making this change.

Or just patch the glibc in your builder instance so we can continue invoking the raw syscall wrapper here? The glibc change eventually will appear upstream so at that point code here won't need to be changed again.

[tangyouling]

compiler-rt/lib/safestack/safestack_platform.h

100 ↗

(On Diff #480731)

I can be too early for libc call, syscall should be used here

Under the current glibc, if syscall is used, the test will fail on loongarch.
It is of course possible to wait for the glibc fix patch to be merged in and just enable safestack without making this change.

Or just patch the glibc in your builder instance so we can continue invoking the raw syscall wrapper here? The glibc change eventually will appear upstream so at that point code here won't need to be changed again.

Yes, then I will remove this change.

[tangyouling]

Use the syscall method and remove the relevant changes.

[SixWeining]

LGTM.

compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake

set(ALL_PROFILE_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${PPC32} ${PPC64}
     ${MIPS32} ${MIPS64} ${S390X} ${SPARC} ${SPARCV9} ${HEXAGON}
     ${RISCV32} ${RISCV64})
 set(ALL_TSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64} ${PPC64} ${S390X}
     ${LOONGARCH64})
 set(ALL_UBSAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${RISCV64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X} ${SPARC} ${SPARCV9} ${HEXAGON}
     ${LOONGARCH64})
 set(ALL_SAFESTACK_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64} ${MIPS32} ${MIPS64}
-    ${HEXAGON})
+    ${HEXAGON} ${LOONGARCH64})
 set(ALL_CFI_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${MIPS64}
     ${HEXAGON})
 set(ALL_SCUDO_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64} ${MIPS32}
     ${MIPS64} ${PPC64} ${HEXAGON} ${LOONGARCH64})
 set(ALL_SCUDO_STANDALONE_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
     ${MIPS32} ${MIPS64} ${PPC64} ${HEXAGON} ${LOONGARCH64})
 if(APPLE)
 set(ALL_XRAY_SUPPORTED_ARCH ${X86_64})