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file mapping stub

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Matheus
2022-10-22 10:58:43 -03:00
parent 5659a2a397
commit 813ab0060c
8 changed files with 131 additions and 17 deletions
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src/sys/syscalls/mmap.c
+44 -16
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@@ -2,6 +2,7 @@
#include <kernel/vmm.h>
#include <sys/types.h>
#include <errno.h>
#include <arch/cls.h>
// linux abi
@@ -44,7 +45,7 @@
#define MFD_CLOEXEC 1U
#define MFD_ALLOW_SEALING 2U
syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off_t offset){
syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int ifd, off_t offset){
syscallret retv;
@@ -55,12 +56,6 @@ syscallret syscall_mmap(void* hint, size_t len, int prot, int flags, int fd, off
retv.errno = EINVAL;
return retv;
}
if((flags & (MAP_ANON | MAP_PRIVATE)) != (MAP_ANON | MAP_PRIVATE)){
retv.errno = ENOSYS;
return retv;
}
size_t mmuflags = 0;
@@ -79,17 +74,50 @@ 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, len) ? hint : NULL; // TODO demand page
if(ret == NULL && (flags & MAP_FIXED) == 0)
if(flags & MAP_ANON){
if(hint)
ret = vmm_allocnowat(hint, mmuflags, len) ? hint : NULL; // TODO demand page
if(ret == NULL && (flags & MAP_FIXED) == 0)
ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen);
if(!ret)
retv.errno = ENOMEM;
else{
retv.ret = ret;
if(hint && (flags & MAP_ANON))
memset(ret, 0, plen*PAGE_SIZE);
}
}
else{
// open node
proc_t* proc = arch_getcls()->thread->proc;
fd_t* fd;
retv.errno = fd_access(&proc->fdtable, &fd, ifd);
if(retv.errno)
return retv;
if(hint)
_panic("mmap: file hint unimplemented", 0);
ret = vmm_allocfrom(USER_ALLOC_START, mmuflags, plen);
if(!ret)
retv.errno = ENOMEM;
else{
retv.ret = ret;
if(hint && (flags & MAP_ANON))
memset(ret, 0, plen*PAGE_SIZE);
if(!ret)
retv.errno = ENOMEM;
else{
retv.errno = vmm_mapfile(fd->node, ret, plen, offset, mmuflags);
if(!retv.errno)
retv.ret = ret;
}
fd_release(fd);
}
return retv;