[wasm][test] Extend jump-table stress test to all archs.

This extends the "test-jump-table-assembler" stress test to supported
architectures. Note that on both PPC and S390 the tests flushes out the
race during jump table patching pretty reliably. Fixing this issue is
outside the scope of this change, this just ensures test coverage exists
but keeps the test in question disabled.

R=clemensh@chromium.org
TEST=cctest/test-jump-table-assembler
BUG=v8:8018

Change-Id: Ia299ed2a42f9858019627270a25026b53f3628d3
Reviewed-on: https://chromium-review.googlesource.com/c/1478200Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59738}

test/cctest/cctest.status

@@ -425,6 +425,9 @@
   # TODO(ppc/s390): implement atomic operations
   'test-run-wasm-atomics/*': [SKIP],
 
+  # TODO(ppc/s390): support concurrent patching of jump table
+  'test-jump-table-assembler/*': [SKIP],
+
 }],  # 'arch == ppc or arch == ppc64 or arch == s390 or arch == s390x'
 
 ['arch == ppc64', {

test/cctest/wasm/test-jump-table-assembler.cc

@@ -24,10 +24,6 @@ namespace wasm {
 
 #define __ masm.
 
-// TODO(v8:7424,v8:8018): Extend this test to all architectures.
-#if V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_ARM || \
-    V8_TARGET_ARCH_ARM64
-
 namespace {
 
 static volatile int global_stop_bit = 0;
@@ -109,6 +105,20 @@ Address GenerateJumpTableThunk(
   __ Tbnz(scratch, 0, &exit);
   __ Mov(scratch, Immediate(jump_target, RelocInfo::NONE));
   __ Br(scratch);
+#elif V8_TARGET_ARCH_PPC64
+  __ mov(scratch, Operand(stop_bit_address, RelocInfo::NONE));
+  __ LoadP(scratch, MemOperand(scratch));
+  __ cmpi(scratch, Operand::Zero());
+  __ bne(&exit);
+  __ mov(scratch, Operand(jump_target, RelocInfo::NONE));
+  __ Jump(scratch);
+#elif V8_TARGET_ARCH_S390X
+  __ mov(scratch, Operand(stop_bit_address, RelocInfo::NONE));
+  __ LoadP(scratch, MemOperand(scratch));
+  __ CmpP(scratch, Operand(0));
+  __ bne(&exit);
+  __ mov(scratch, Operand(jump_target, RelocInfo::NONE));
+  __ Jump(scratch);
 #else
 #error Unsupported architecture
 #endif
@@ -236,9 +246,6 @@ TEST(JumpTablePatchingStress) {
   }
 }
 
-#endif  // V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_ARM ||
-        // V8_TARGET_ARCH_ARM64
-
 #undef __
 #undef TRACE