[syscalls] Change vmar_... calls

- Create zx_vm_option_t type
- Change ZX_VM_FLAG_... to ZX_VM_... and make them new type.
- Change int32_t flags parameters to zx_vm_option_t options
- Make the options parameter be second.

- Modify vmar_..._old functions to keep other repos working.
Once they've all been updated these functions will go away.

ZX-2264
Test:CQ

Change-Id: I1faf4cc4e1e4dabf3d8ef680e398d83a545b0f09

[syscall][vmo] removal of zx_vmo_{read,write}() actual parameter 4/n

This reverts commit d7c91f0a8a876bd4de8808595cafcd4f2c3fd7a1.

Change-Id: I5c61410f62850583a970d3ff2f44b6d58901509a

[revert] Revert "[syscall][vmo] removal of zx_vmo_{read,write}() actual parameter 4/n"

This reverts commit 2d25909b7ab244d73172c9f5bc11d85b49ccefbb.

Change-Id: I09efe4e1d69d7aeadb051936d3ddc8237e7d39cf

[syscall][vmo] removal of zx_vmo_{read,write}() actual parameter 4/n

Remove actual from zx_vmo_{read,write}
Mark zx_vmo_{read,write}_old as deprecated
Retarget most uses of zx_vmo_{read,write}_old to zx_vmo_{read,write}.

Still need to migrate a handful of uses of _old that had meaningful
usage of actual.
This is good enough to go ahead and migrate uses in Garnet and Topaz.

ZX-1802

Change-Id: If57329f9c5183a0dacd29083decbaf771925145f

[syscall][vmo] removal of zx_vmo_{read,write}() actual parameter 1/n

In preparation for changing the zx_vmo_read() and write() syscalls,
introduce aliases (zx_vmo_read_old() and write_old()) for the existing
behaviour, migrate zircon callers to the aliases, and mark the original
syscalls as deprecated.

Once the garnet and above layers have been migrated, the original
syscalls will be adjusted to remove the "actual" argument, and the
temporary _old() versions will be deprecated, and then removed.

ZX-1802

Change-Id: I2fab9a59caf4093fb585ada6015197017767aba2

[zx] Magenta -> Zircon

The Great Renaming is here!

Change-Id: I3229bdeb2a3d0e40fb4db6fec8ca7d971fbffb94

[ulib][status] Use the MX_OK and MX_ERR_* mx_status_t names

Change-Id: I3ba531de766b559b8922fb4910715c630efc9b82

[ulib][elfload] Improve naming of data/bss VMOs

Use "bss:name" instead of just "bss" for the bss VMO.
Give the name "data:name" to the writable data VMO.

Change-Id: I62880b0a43f94baecac5e90a3f5fdd1ae4ca51b4

[launchpad] Name bss VMO

Change-Id: I3f1cc2fd871d301e119f669865491e9aee275417

[ulib][elfload] Remove unnecessary vmar_self parameter

This is no longer needed, so don't pass it down.

Change-Id: I28f995cb4a34a467b13074767a2b5b0006af086e

[ulib][elfload] Use mx_vmo_clone for writable segments

We now have copy-on-write support, so use it.

Change-Id: I66bef27521a139dd36a5a498a5cf09e905a1f590

[launchpad] Add script execution.

Adds support in launchpad for loading an interpreted script file,
with a new API function "launchpad_file_load".

Change-Id: Iba091890c9975c6066c7f5a38ad577879cd599c8

[processargs][userboot][launchpad] Plumb through MX_HND_TYPE_VMAR_LOADED

Add a processargs handle type for the VMAR used to load the initial
program image (usually the dynamic linker). This is passed down by
launchpad (and userboot), and received by the dynamic linker. It
enables the dynamic linker to apply RELRO page protections to its
own image after relocation.

Change-Id: Ib91933a41c52617207d33a631ff0436baf704ef1

[ulib][elfload] Fix up last change

The last change had a stray line that I'd removed in the version
I tested, but I'd failed to upload the tested version of the change.

Change-Id: I289c1cc5baf407ae09c883fb6325aaec4d28ede3

[ulib][elfload] Don't conflate mx_handle_t and mx_status_t values

Don't use mx_handle_t to contain status values, and don't assume
that handles are positive or that error codes are negative.

Change-Id: I535024f36f884bc9bc5515f82425452496c78bb3

[ulib][elfload] Use a VMAR in the ELF loader

Make the ELF loader (used by both userboot and launchpad) allocate
a VMAR for the whole address region occupied by an ELF load image.

Change-Id: Id853d726a000fb7346c38a1bc844e72ced9570b4

[vmar][elf] Make the elf loader use VMARs

Change-Id: I1930a886b920f31de90d40d36b88840e1510f43b

Remove mx_size_t and mx_ssize_t types

mx_ssize_t is no longer used. mx_size_t is superfluous and
can be replaced by the standard C type size_t.

Change-Id: I2137af6f166099d2e8aaca4fab63ff101f2a43ac

[syscalls] update vmo_{create,read,write}()

Change-Id: I6b46a48813de4e74767174c2786d04cf414b017a

[ulib][elfload] Refuse to load ET_EXEC files

We don't really support fixed-address ELF files (ET_EXEC).
So just reject them outright.

Change-Id: I86de4cdbc5fda203b41bd2139bf83a104c8efce2

[ulib][elfload] Don't use process handle 0 hack

The COW-replacement code needs to map memory in the calling process,
so it needs its own process handle. Pass the handle in, rather than
using the old process handle 0 hack.

Change-Id: I7e0cc18c7218c248fae395ab13f38abd0bbb0791

[ulib][elfload] Fix VMO handle leak in mapping writable segments

The new structure of the code better represents how things will
look when there is a call to create a COW proxy object for a VMO.

Change-Id: I135dfdd85b1ca5d4afd7334a3fe2a0d739d7e65e

[magenta][syscalls] migrate all syscalls to the new names

If DEPCRECATE_COMPAT_SYSCALLS is defined, flag the compatibility
wrappers with the deprecated attribute.

Enable this in the Magenta build only for now.

Change-Id: I422b1294d9db2e56551eca65dede0e5d83f8b363

[ulib][uapp] Replace internal elf-defines.h with standard <elf.h>

The C library provides a standard header for ELF structures and
constants. Get rid of the homegrown equivalent.

Change-Id: I54ab3faef434caf6b34fb0faef1a75daced5dae4

[system] align license and license banners with Fuchsia

This adjusts the Magenta userspace code to match the prevailing
license in Fuchsia (three-clause BSD), using the same banner
and license text.

Change-Id: I6b6d79435c5dbaa32027888874849e4f47aaa7be

[ulib] [launchpad] Add launchpad_elf_load_extra function

This is a way to load an additional ELF file into the process
without it determining the entry point. Instead, the caller
(optionally) gets back the load address and entry point.

Change-Id: Ie74b0f4915a294663be3d7c8422f1126da8ab4e2

[ulib] [launchpad] Factor core ELF loading code out into elfload library

The new library is simple, pure code that does no memory allocation.
It's still rolled directly into the launchpad library.
But it's also available to be rolled into other code.

Change-Id: Iec7f74285a1a3901d7cbfa08d5cf1ced9aeb3b27