diff options
| -rw-r--r-- | sys/kern/kern_loader.c | 33 |
1 files changed, 4 insertions, 29 deletions
diff --git a/sys/kern/kern_loader.c b/sys/kern/kern_loader.c index 53ba8c2..23249ea 100644 --- a/sys/kern/kern_loader.c +++ b/sys/kern/kern_loader.c @@ -61,12 +61,10 @@ int loader_load(struct vas vas, const void *dataptr, struct auxval *auxv, vm_prot_t prot = PROT_USER; uintptr_t physmem; - uintptr_t max_addr, map_addr; - size_t misalign, page_count; - + size_t misalign, page_count, map_len; int status; - const size_t GRANULE = vm_get_page_size(); + const size_t GRANULE = vm_get_page_size(); void *tmp_ptr; if (auxv == NULL) { @@ -93,26 +91,8 @@ int loader_load(struct vas vas, const void *dataptr, struct auxval *auxv, misalign = phdr->p_vaddr & (GRANULE - 1); page_count = __DIV_ROUNDUP(phdr->p_memsz + misalign, GRANULE); - max_addr = phdr->p_vaddr + (GRANULE * page_count); - - /* - * We are assuming this is a user program that we are loading. - * All user programs should be on the lower half of the address - * space. We will check that before we begin doing anything here. - * - * We are also going to check if the virtual address the program - * header refers to overflows into the higher half. If anything - * goes into the higher half, we won't simply drop the phdr, - * we'll instead assume caller error and return -EINVAL. - */ - if (phdr->p_vaddr >= VM_HIGHER_HALF) { - return -EINVAL; - } else if (max_addr >= VM_HIGHER_HALF) { - /* Overflows into higher half */ - return -EINVAL; - } - physmem = vm_alloc_pageframe(page_count); + map_len = page_count * GRANULE; /* Do we not have enough page frames? */ if (physmem == 0) { @@ -121,14 +101,9 @@ int loader_load(struct vas vas, const void *dataptr, struct auxval *auxv, return -ENOMEM; } - map_addr = phdr->p_vaddr + load_base; - status = vm_map_create(vas, map_addr, physmem, prot, page_count*GRANULE); + status = vm_map_create(vas, phdr->p_vaddr + load_base, physmem, prot, map_len); if (status != 0) { - DBG("Failed to map 0x%p - 0x%p\n", - phdr->p_vaddr + load_base, - (phdr->p_vaddr + load_base) + (page_count * GRANULE)); - return status; } |