[compiler-rt] [compiler-rt] Support building runtimes for Windows on arm32 (PR #101462)

[Martin Storsjö via llvm-commits]

https://github.com/mstorsjo created https://github.com/llvm/llvm-project/pull/101462

In these environments, the architecture name is armv7; recognize that and enable the relevant runtimes.

Fix building the sanitizer_common library for this target, by using the right registers for the architecture - this is similar to what 0c391133c9201ef29273554a1505ef855ce17668 did for aarch64.

(Still, address sanitizer doesn't support hooking functions at runtime on armv7 or aarch64 - but other runtimes such as ubsan do work.)

>From ebb5742b3f312c929605a9b52aa25c93d5d8537e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin at martin.st>
Date: Thu, 30 Mar 2023 12:27:39 +0300
Subject: [PATCH] [compiler-rt] Support building runtimes for Windows on arm32

In these environments, the architecture name is armv7; recognize
that and enable the relevant runtimes.

Fix building the sanitizer_common library for this target, by using
the right registers for the architecture - this is similar to what
0c391133c9201ef29273554a1505ef855ce17668 did for aarch64.

(Still, address sanitizer doesn't support hooking functions
at runtime on armv7 or aarch64 - but other runtimes such as ubsan
do work.)
---
 compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake      | 4 ++++
 compiler-rt/lib/sanitizer_common/sanitizer_unwind_win.cpp | 7 +++++++
 compiler-rt/lib/sanitizer_common/sanitizer_win.cpp        | 5 +++++
 3 files changed, 16 insertions(+)

diff --git a/compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake b/compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake
index 29e5beb6182ba..37ad48bef818a 100644
--- a/compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake
+++ b/compiler-rt/cmake/Modules/AllSupportedArchDefs.cmake
@@ -24,6 +24,10 @@ if(APPLE)
   set(X86_64 x86_64 x86_64h)
 endif()
 
+if(WIN32)
+  set(ARM32 ${ARM32} armv7)
+endif()
+
 set(ALL_SANITIZER_COMMON_SUPPORTED_ARCH ${X86} ${X86_64} ${PPC64} ${RISCV64}
     ${ARM32} ${ARM64} ${MIPS32} ${MIPS64} ${S390X} ${SPARC} ${SPARCV9}
     ${HEXAGON} ${LOONGARCH64})
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_unwind_win.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_unwind_win.cpp
index afcd01dae0b7a..6fc18396ca63b 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_unwind_win.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_unwind_win.cpp
@@ -70,10 +70,17 @@ void BufferedStackTrace::UnwindSlow(uptr pc, void *context, u32 max_depth) {
   stack_frame.AddrStack.Offset = ctx.Rsp;
 #      endif
 #    else
+#      if SANITIZER_ARM
+  int machine_type = IMAGE_FILE_MACHINE_ARM;
+  stack_frame.AddrPC.Offset = ctx.Pc;
+  stack_frame.AddrFrame.Offset = ctx.R11;
+  stack_frame.AddrStack.Offset = ctx.Sp;
+#      else
   int machine_type = IMAGE_FILE_MACHINE_I386;
   stack_frame.AddrPC.Offset = ctx.Eip;
   stack_frame.AddrFrame.Offset = ctx.Ebp;
   stack_frame.AddrStack.Offset = ctx.Esp;
+#      endif
 #    endif
   stack_frame.AddrPC.Mode = AddrModeFlat;
   stack_frame.AddrFrame.Mode = AddrModeFlat;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_win.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_win.cpp
index 995f00eddc38a..8a80d54751364 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_win.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_win.cpp
@@ -992,8 +992,13 @@ void SignalContext::InitPcSpBp() {
   sp = (uptr)context_record->Rsp;
 #    endif
 #  else
+#    if SANITIZER_ARM
+  bp = (uptr)context_record->R11;
+  sp = (uptr)context_record->Sp;
+#    else
   bp = (uptr)context_record->Ebp;
   sp = (uptr)context_record->Esp;
+#    endif
 #  endif
 }