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-rw-r--r--application/palemoon/app/nsBrowserApp.cpp45
1 files changed, 45 insertions, 0 deletions
diff --git a/application/palemoon/app/nsBrowserApp.cpp b/application/palemoon/app/nsBrowserApp.cpp
index 8b0613528..c73b05d23 100644
--- a/application/palemoon/app/nsBrowserApp.cpp
+++ b/application/palemoon/app/nsBrowserApp.cpp
@@ -35,6 +35,51 @@
#include "mozilla/Telemetry.h"
#include "mozilla/WindowsDllBlocklist.h"
+#ifdef MOZ_LINUX_SSE2_STARTUP_ERROR
+#include <cpuid.h>
+#include "mozilla/Unused.h"
+
+static bool
+IsSSE2Available()
+{
+ // The rest of the app has been compiled to assume that SSE2 is present
+ // unconditionally, so we can't use the normal copy of SSE.cpp here.
+ // Since SSE.cpp caches the results and we need them only transiently,
+ // instead of #including SSE.cpp here, let's just inline the specific check
+ // that's needed.
+ unsigned int level = 1u;
+ unsigned int eax, ebx, ecx, edx;
+ unsigned int bits = (1u<<26);
+ unsigned int max = __get_cpuid_max(0, nullptr);
+ if (level > max) {
+ return false;
+ }
+ __cpuid_count(level, 0, eax, ebx, ecx, edx);
+ return (edx & bits) == bits;
+}
+
+static const char sSSE2Message[] =
+ "This browser version requires a processor with the SSE2 instruction "
+ "set extension.\n";
+
+__attribute__((constructor))
+static void
+SSE2Check()
+{
+ if (IsSSE2Available()) {
+ return;
+ }
+ // Using write() in order to avoid jemalloc-based buffering. Ignoring return
+ // values, since there isn't much we could do on failure and there is no
+ // point in trying to recover from errors.
+ MOZ_UNUSED(write(STDERR_FILENO,
+ sSSE2Message,
+ MOZ_ARRAY_LENGTH(sSSE2Message) - 1));
+ // _exit() instead of exit() to avoid running the usual "at exit" code.
+ _exit(255);
+}
+#endif
+
#if !defined(MOZ_WIDGET_COCOA) && !defined(MOZ_WIDGET_ANDROID)
#define MOZ_BROWSER_CAN_BE_CONTENTPROC
#include "../../ipc/contentproc/plugin-container.cpp"