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--- third_party/blink/renderer/platform/wtf/stack_util.cc.orig 2022-03-25 21:59:56 UTC
+++ third_party/blink/renderer/platform/wtf/stack_util.cc
@@ -18,6 +18,11 @@
extern "C" void* __libc_stack_end; // NOLINT
#endif
+#if BUILDFLAG(IS_BSD)
+#include <sys/signal.h>
+#include <pthread_np.h>
+#endif
+
namespace WTF {
size_t GetUnderestimatedStackSize() {
@@ -62,6 +67,8 @@ size_t GetUnderestimatedStackSize() {
// low as 512k.
//
return 512 * 1024;
+#elif BUILDFLAG(IS_OPENBSD)
+ return 512 * 1024;
#elif BUILDFLAG(IS_MAC)
// pthread_get_stacksize_np() returns too low a value for the main thread on
// OSX 10.9,
@@ -147,6 +154,13 @@ void* GetStackStart() {
::GetCurrentThreadStackLimits(&lowLimit, &highLimit);
return reinterpret_cast<void*>(highLimit);
#endif
+#elif BUILDFLAG(IS_OPENBSD)
+ stack_t ss;
+ void *base;
+ int error = pthread_stackseg_np(pthread_self(), &ss);
+ CHECK(!error);
+ base = (void*)((size_t) ss.ss_sp - ss.ss_size);
+ return reinterpret_cast<uint8_t*>(base) + ss.ss_size;
#else
#error Unsupported getStackStart on this platform.
#endif
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