gettid syscall, fix issues with vmm and mmap syscall

src/sys/mm/vmm.c

@@ -395,14 +395,16 @@ void* vmm_allocfrom(void* addr, size_t mmuflags, size_t pagec){
 
 	spinlock_acquire(lock);
 	
-	addr = findfirstfreearea(findmappingfromaddr(*start, addr), pagec);
+	vmm_mapping* map = findmappingfromaddr(*start, addr);
+
+	addr = findfirstfreearea(map, pagec);
 
 	if(!addr)
 		goto _done;
 	
 	if(!setmap(start, addr, pagec, mmuflags, VMM_TYPE_ANON, 0, 0))
 		addr = NULL;
-
+	
 	_done:
 	
 	spinlock_release(lock);
@@ -514,8 +516,11 @@ bool vmm_allocnowat(void* addr, size_t mmuflags, size_t size){
 
 // called by the page fault handler
 
-bool vmm_dealwithrequest(void* addr){
+bool vmm_dealwithrequest(void* addr, long error, bool user){
 	
+	if(user && addr > USER_SPACE_END)
+		return false;
+
 	int* lock;
 	vmm_mapping** start = NULL;
 	
@@ -533,10 +538,27 @@ bool vmm_dealwithrequest(void* addr){
 		status = false;
 		goto done;
 	}
-	
+
 	if(map->type == VMM_TYPE_FILE)
 		_panic("File mappings are not supported (yet)", 0);
 
+	size_t goodmmuflags = 1;
+
+	if(error & ARCH_MMU_ERROR_WRITE)
+		goodmmuflags |= ARCH_MMU_MAP_WRITE;
+	
+	if(error & ARCH_MMU_ERROR_USER)
+		goodmmuflags |= ARCH_MMU_MAP_USER;
+	
+	if(error & ARCH_MMU_ERROR_INSTFETCH == 0)
+		goodmmuflags |= ARCH_MMU_MAP_NOEXEC;
+
+
+	if(goodmmuflags != (map->mmuflags & goodmmuflags))
+		return false;
+	
+
+
 	// allocate a page
 
 	addr = (size_t)addr & ~(0xFFF);

src/sys/sched/elf.c

@@ -304,7 +304,7 @@ int elf_load(thread_t* thread, vnode_t* node, char** argv, char** env){
 	// also load the executable memory image if we're using an interpreter
 	
 	if(interp){
-		for(size_t currentph = 0; currentph < header.ph_count; ++currentph){
+		for(size_t currentph = 0; currentph < progheader.ph_count; ++currentph){
 
 			// read ph
 

src/sys/syscalls/gettid.c

@@ -0,0 +1,9 @@
+#include <kernel/syscalls.h>
+#include <arch/cls.h>
+
+syscallret syscall_gettid(){
+	syscallret retv;
+	retv.errno = 0;
+	retv.ret = arch_getcls()->thread->tid;
+	return retv;
+}

src/sys/syscalls/mmap.c

@@ -45,6 +45,7 @@
 #define MFD_ALLOW_SEALING 2U
 
 syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off_t offset){
+
 	syscallret retv;
 	
 	retv.ret = -1;
@@ -79,10 +80,10 @@ syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off
 	void* ret = NULL;
 
 	if(hint)
-		ret = vmm_allocnowat(hint, mmuflags, plen) ? hint : NULL; // TODO demand page
+		ret = vmm_allocnowat(hint, mmuflags, len) ? hint : NULL; // TODO demand page
 	
 	if(!ret && !(flags & MAP_FIXED))
-		ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, len);
+		ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen);
 
 	if(!ret){
 		retv.errno = ENOMEM;