From 1e9fe24b397e86966b243b80e8c13218b6e382eb Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sun, 15 Mar 2026 09:49:18 +0000
Subject: [PATCH] ld: anonymous and file-backed mmap tests

---
 sys/ld/main.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/sys/ld/main.c b/sys/ld/main.c
index feab04d..f66079b 100644
--- a/sys/ld/main.c
+++ b/sys/ld/main.c
@@ -13,11 +13,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/mman.h>
 #include <sys/remote.h>
 #include <unistd.h>
 
 int main(const struct rosetta_bootstrap *bs)
 {
+	kern_logf("ld");
+
 	kern_handle_t task, address_space;
 	task_self(&task);
 	task_get_address_space(task, &address_space);
@@ -29,9 +32,9 @@ int main(const struct rosetta_bootstrap *bs)
 	sys_remote_set(SYS_REMOTE_NSD, 0, 0);
 	const char *path = "/usr/lib/libc.so";
 	int flags = 4;
-	int fd = open(path, flags);
 
 	kern_logf("sending msg: open(%s, %d)", path, flags);
+	int fd = open(path, flags);
 
 	if (fd < 0) {
 		kern_logf(
@@ -60,5 +63,30 @@ int main(const struct rosetta_bootstrap *bs)
 
 	kern_logf("data: %x %c %c %c", buf[0], buf[1], buf[2], buf[3]);
 
+	void *p
+		= mmap(NULL,
+	               0x1000,
+	               PROT_READ | PROT_WRITE,
+	               MAP_ANONYMOUS | MAP_PRIVATE,
+	               -1,
+	               0);
+	if (p != MAP_FAILED) {
+		memset(p, 0x0, 0x1000);
+		kern_logf("mmap'd buffer at %p", p);
+	} else {
+		kern_logf("mmap buffer failed");
+	}
+
+	void *lib
+		= mmap(NULL, 0x1000, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0);
+	if (lib != MAP_FAILED) {
+		kern_logf("mmap'd %s at %p", path, lib);
+		unsigned char *tmp = lib;
+		kern_logf("data: %x %c %c %c", tmp[0], tmp[1], tmp[2], tmp[3]);
+	} else {
+		kern_logf("mmap lib failed");
+	}
+
+	kern_logf("ld finished");
 	return 0;
 }