[compiler-rt] dump registers for FreeBSD/i386 (#99702)

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Differential Revision: https://phabricator.intern.facebook.com/D60251263

Author: devnexen

compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

@@ -2262,6 +2262,18 @@ void SignalContext::DumpAllRegisters(void *context) {
   Printf("r14 = 0x%016llx  ", ucontext->uc_mcontext.mc_r14);
   Printf("r15 = 0x%016llx  ", ucontext->uc_mcontext.mc_r15);
   Printf("\n");
+#    elif defined(__i386__)
+  Report("Register values:\n");
+  Printf("eax = 0x%08x  ", ucontext->uc_mcontext.mc_eax);
+  Printf("ebx = 0x%08x  ", ucontext->uc_mcontext.mc_ebx);
+  Printf("ecx = 0x%08x  ", ucontext->uc_mcontext.mc_ecx);
+  Printf("edx = 0x%08x  ", ucontext->uc_mcontext.mc_edx);
+  Printf("\n");
+  Printf("edi = 0x%08x  ", ucontext->uc_mcontext.mc_edi);
+  Printf("esi = 0x%08x  ", ucontext->uc_mcontext.mc_esi);
+  Printf("ebp = 0x%08x  ", ucontext->uc_mcontext.mc_ebp);
+  Printf("esp = 0x%08x  ", ucontext->uc_mcontext.mc_esp);
+  Printf("\n");
 #    else
   (void)ucontext;
 #    endif

compiler-rt/test/sanitizer_common/TestCases/FreeBSD/dump_registers_i386.cpp

@@ -0,0 +1,17 @@
+// Check that sanitizer prints registers dump_registers on dump_registers=1
+// RUN: %clangxx  %s -o %t
+// RUN: %env_tool_opts=dump_registers=0 not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK-NODUMP --strict-whitespace
+// RUN: not %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK-DUMP --strict-whitespace
+//
+// REQUIRES: i386-target-arch
+
+#include <signal.h>
+
+int main() {
+  raise(SIGSEGV);
+  // CHECK-DUMP: Register values
+  // CHECK-DUMP-NEXT: eax = {{0x[0-9a-f]+}}  ebx = {{0x[0-9a-f]+}}  ecx = {{0x[0-9a-f]+}}  edx = {{0x[0-9a-f]+}}
+  // CHECK-DUMP-NEXT: edi = {{0x[0-9a-f]+}}  esi = {{0x[0-9a-f]+}}  ebp = {{0x[0-9a-f]+}}  esp = {{0x[0-9a-f]+}}
+  // CHECK-NODUMP-NOT: Register values
+  return 0;
+}