third_party/marl: Implement page-based functions for Fuchsia
Mostly copypasta from: src/Reactor/ExecutableMemory.cpp
Will be upstreamed to marl if the autorollers are happy.
Bug: b/140546382
Change-Id: I6cf0dc8638e37f17d097ea645c9a84cef1368a3d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37131
Reviewed-by: Ben Clayton <bclayton@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
diff --git a/third_party/marl/src/memory.cpp b/third_party/marl/src/memory.cpp
index 834c849..b9f6cc1 100644
--- a/third_party/marl/src/memory.cpp
+++ b/third_party/marl/src/memory.cpp
@@ -50,6 +50,48 @@
MARL_ASSERT(res == 0, "Failed to protect page at %p", addr);
}
} // anonymous namespace
+#elif defined(__Fuchsia__)
+#include <unistd.h>
+#include <zircon/process.h>
+#include <zircon/syscalls.h>
+namespace {
+// This was a static in pageSize(), but due to the following TSAN false-positive
+// bug, this has been moved out to a global.
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68338
+const size_t kPageSize = sysconf(_SC_PAGESIZE);
+inline size_t pageSize() {
+ return kPageSize;
+}
+inline void* allocatePages(size_t count) {
+ auto length = count * kPageSize;
+ zx_handle_t vmo;
+ if (zx_vmo_create(length, 0, &vmo) != ZX_OK) {
+ return nullptr;
+ }
+ zx_vaddr_t reservation;
+ zx_status_t status =
+ zx_vmar_map(zx_vmar_root_self(), ZX_VM_PERM_READ | ZX_VM_PERM_WRITE, 0,
+ vmo, 0, length, &reservation);
+ zx_handle_close(vmo);
+ (void)status;
+ MARL_ASSERT(status == ZX_OK, "Failed to allocate %d pages", int(count));
+ return reinterpret_cast<void*>(reservation);
+}
+inline void freePages(void* ptr, size_t count) {
+ auto length = count * kPageSize;
+ zx_status_t status = zx_vmar_unmap(zx_vmar_root_self(),
+ reinterpret_cast<zx_vaddr_t>(ptr), length);
+ (void)status;
+ MARL_ASSERT(status == ZX_OK, "Failed to free %d pages at %p", int(count),
+ ptr);
+}
+inline void protectPage(void* addr) {
+ zx_status_t status = zx_vmar_protect(
+ zx_vmar_root_self(), 0, reinterpret_cast<zx_vaddr_t>(addr), kPageSize);
+ (void)status;
+ MARL_ASSERT(status == ZX_OK, "Failed to protect page at %p", addr);
+}
+} // anonymous namespace
#elif defined(_WIN32)
#define WIN32_LEAN_AND_MEAN 1
#include <Windows.h>
@@ -82,7 +124,6 @@
}
} // anonymous namespace
#else
-// TODO: Fuchsia support
#error "Page based allocation not implemented for this platform"
#endif
