add program break stuff

kernel/Syscalls/execute.c

@@ -186,13 +186,19 @@ int32_t _sys_exec(uint8_t* cmd)
 	// read the program header to see how many bytes you needed to allocate and where
 	// wrote an ext2 read where you could specifiy a starting point in the inode and bytes to read
 
+	pcb->program_break = NULL;
+
 	for (i = 0; i < e_header->e_phnum; i++) {
 		printf("Program header %d type %x flags %x", i, p_header[i]->p_type, p_header[i]->p_flags);
 		printf(" offset %x vaddr %#x paddr %#x size %x\n", 
 			p_header[i]->p_offset, p_header[i]->p_vaddr, p_header[i]->p_paddr, p_header[i]->p_filesz);
 		memccpy(p_header[i]->p_vaddr, EXEC_TMP_ADDR + p_header[i]->p_offset, p_header[i]->p_memsz);
+		if (p_header[i]->p_vaddr + p_header[i]->p_memsz > pcb->program_break)
+			pcb->program_break = p_header[i]->p_vaddr + p_header[i]->p_memsz;
 	}
 
+	pcb->program_size = pcb->program_break;
+
 	unmap_large(EXEC_TMP_ADDR);
 
 	//ext2_read_sectors(parsed_inode, p_header[1]->p_offset/512, divhi(p_header[1]->p_memsz, 512), p_header[1]->p_vaddr);

kernel/Syscalls/execute.h

@@ -112,6 +112,8 @@ typedef struct pcb {
 	int32_t parent_pid;
 	uint32_t parent_esp;
 	uint32_t parent_ebp;
+	uint32_t program_size;
+	uint32_t program_break;
 } pcb_t;
 
 int32_t _sys_exec(uint8_t* name);