dietlibc: half-hearted attempt at getting malloc working

1 files changed, 36 insertions, 0 deletions

diff --git a/src/target/firmware/lib/system.c b/src/target/firmware/lib/system.c
index 48ef5f1e..2c44aada 100644
--- a/src/target/firmware/lib/system.c
+++ b/src/target/firmware/lib/system.c
@@ -1,8 +1,10 @@
 
+#include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>
 
 #include <errno.h>
+#include <stdio.h>
 #include <unistd.h>
 
 #include <comm/sercomm_cons.h>
@@ -13,6 +15,40 @@ int ioctl(int fd, long int request, ...) {
     return 0;
 }
 
+extern char _end;
+
+const char *heaptop = &_end;
+
+void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) {
+	if(addr || (fd != -1) || offset) {
+		errno = ENOTSUP;
+		return NULL;
+	}
+	if(flags != (MAP_PRIVATE|MAP_ANONYMOUS)) {
+		errno = ENOTSUP;
+		return NULL;
+	}
+	void *result = heaptop;
+	heaptop += length;
+	return result;
+}
+
+void *mremap(void *old_address, size_t old_size, size_t new_size, unsigned long flags) {
+	if(new_size <= old_size) {
+		return old_address;
+	}
+	if(!(flags & MREMAP_MAYMOVE)) {
+		errno = ENOTSUP;
+		return NULL;
+	}
+
+	return mmap(NULL, new_size, 0, (MAP_PRIVATE|MAP_ANONYMOUS), -1, 0);
+}
+
+int munmap(void *addr, size_t length) {
+	return 0;
+}
+
 ssize_t __libc_write(int fd, const void *buf, size_t count) {
 	char c;
 	int i;