exclude interpreter's segment from data region

When an interpreter is located on the lower address (e.g. 0x0),
the text region is included in data region.
A fix to avoid this.

executer/include/uprotocol.h

@@ -25,7 +25,8 @@ struct program_image_section {
 	unsigned long remote_pa;
 	unsigned long filesz, offset;
 	int prot;
-	int padding;
+	unsigned char interp;
+	unsigned char padding[3];
 	void *fp;
 };
 

executer/user/mcexec.c

@@ -145,6 +145,7 @@ struct program_load_desc *load_elf(FILE *fp, char **interp_pathp)
 			desc->sections[j].filesz = phdr.p_filesz;
 			desc->sections[j].offset = phdr.p_offset;
 			desc->sections[j].len = phdr.p_memsz;
+			desc->sections[j].interp = 0;
 			desc->sections[j].fp = fp;
 
 			desc->sections[j].prot = PROT_NONE;
@@ -255,6 +256,7 @@ struct program_load_desc *load_interp(struct program_load_desc *desc0, FILE *fp)
 			desc->sections[j].filesz = phdr.p_filesz;
 			desc->sections[j].offset = phdr.p_offset;
 			desc->sections[j].len = phdr.p_memsz;
+			desc->sections[j].interp = 1;
 			desc->sections[j].fp = fp;
 
 			desc->sections[j].prot = PROT_NONE;

kernel/host.c

@@ -133,7 +133,10 @@ static int process_msg_prepare_process(unsigned long rphys)
 		p->sections[i].remote_pa = up;
 
 		/* TODO: Maybe we need flag */
-		if (i == 0) {
+		if (pn->sections[i].interp) {
+			/* nothing to do */
+		}
+		else if (i == 0) {
 			proc->vm->region.text_start = s;
 			proc->vm->region.text_end = e;
 		} else if (i == 1) {

kernel/include/syscall.h

@@ -84,7 +84,8 @@ struct program_image_section {
 	unsigned long remote_pa;
 	unsigned long filesz, offset;
 	int prot;
-	int padding;
+	unsigned char interp;
+	unsigned char padding[3];
 	void *fp;
 };