Start working on memory-mapped files.

First of all, change sys$mmap to take a struct SC_mmap_params since our
sycsall calling convention can't handle more than 3 arguments.

This exposed a bug in Syscall::invoke() needing to use clobber lists.
It was a bit confusing to debug. :^)

1 files changed, 1 insertions, 1 deletions

diff --git a/LibC/stdlib.cpp b/LibC/stdlib.cpp
index fa6c91fb4c..342ab92e2f 100644
--- a/LibC/stdlib.cpp
+++ b/LibC/stdlib.cpp
@@ -18,7 +18,7 @@ static byte* endptr = nullptr;
 
 void __malloc_init()
 {
-    nextptr = (byte*)mmap(nullptr, mallocBudget);
+    nextptr = (byte*)mmap(nullptr, mallocBudget, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
     endptr = nextptr + mallocBudget;
     int rc = set_mmap_name(nextptr, mallocBudget, "malloc");
     if (rc < 0)