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Added MAP_GROWSDOWN feature to do_mmap. Fixed sys_mmap return.

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This commit is contained in:
Bahadir Balban
2008-09-10 12:43:49 +03:00
parent 7b9e02d04b
commit fc51512438
4 changed files with 24 additions and 10 deletions
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20
tasks/mm0/src/mmap.c
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@@ -11,7 +11,7 @@
#include <mmap.h>
#include <memory.h>
#include <l4lib/arch/syscalls.h>
#include <l4lib/arch/syslib.h>
#if 0
/* TODO: This is to be implemented when fs0 is ready. */
@@ -568,7 +568,14 @@ int do_mmap(struct vm_file *mapfile, unsigned long file_offset,
map_address, map_address + npages * PAGE_SIZE);
task_add_vma(task, new);
return 0;
/*
* If area is going to be used going downwards, (i.e. as a stack)
* we return the *end* of the area as the start address.
*/
if (flags & VMA_GROWSDOWN)
map_address += npages;
return map_address;
}
/* mmap system call implementation */
@@ -580,7 +587,6 @@ int sys_mmap(l4id_t sender, void *start, size_t length, int prot,
struct vm_file *file = 0;
unsigned int vmflags = 0;
struct tcb *task;
int err;
BUG_ON(!(task = find_task(sender)));
@@ -619,6 +625,9 @@ int sys_mmap(l4id_t sender, void *start, size_t length, int prot,
else /* This also means COW, if writeable and anonymous */
vmflags |= VMA_SHARED;
if (flags & MAP_GROWSDOWN)
vmflags |= VMA_GROWSDOWN;
if (prot & PROT_READ)
vmflags |= VM_READ;
if (prot & PROT_WRITE)
@@ -626,10 +635,9 @@ int sys_mmap(l4id_t sender, void *start, size_t length, int prot,
if (prot & PROT_EXEC)
vmflags |= VM_EXEC;
if ((err = do_mmap(file, __pfn_to_addr(pfn), task,
base, vmflags, npages)) < 0)
return err;
base = do_mmap(file, __pfn_to_addr(pfn), task, base, vmflags, npages);
l4_ipc_return(base);
return 0;
}