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Fix metal bugs so deathstar.com runs in qemu (#20)

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- Remove XD bit in page tables
- Fix cylinder+head+sector arithmetic
- Implement fstat() for serial file descriptors on metal

Here's how to boot an Actually Portable Executable in QEMU:

    make -j12 o//tool/viz/deathstar.com
    qemu-system-x86_64 -serial stdio -fda o//tool/viz/deathstar.com

Here's a screenshot of DEATHSTAR.COM booted in QEMU:
https://justine.lol/cosmopolitan/cosmo-metal-qemu.png

Thus metal support is in much better shape now, but still incomplete.
Only a few system calls have been polyfilled. To figure out which ones
your program needs, simply boot it in the blinkenlights emulator with a
breakpoint, and press CTRL-C to continue to the system call breakpoint.
If it doesn't break then you should be good. (Note: to emulate normally
you can press 'c' and use CTRL-T and ALT-T to tune the speed.)

    m=tiny
    make -j12 SILENT=0 MODE=$m          \
      o/$m/tool/build/blinkenlights.com \
      o/$m/tool/viz/deathstar.com
    o/$m/tool/build/blinkenlights.com   \
      -r -t -b systemfive.linux         \
      o/$m/tool/viz/deathstar.com

Thank @Theldus for the bug report that made this change possible.
Fixes #20 which explains this change further.
This commit is contained in:
Justine Tunney 2021-01-16 17:52:15 -08:00
parent 58d9659d53
commit f0600a898c
13 changed files with 182 additions and 119 deletions
Download patch file Download diff file Expand all files Collapse all files

65
libc/calls/fstat-nt.c
View file

@ -35,34 +35,47 @@ textwindows int fstat$nt(int64_t handle, struct stat *st) {
uint64_t actualsize;
struct NtFileCompressionInfo fci;
struct NtByHandleFileInformation wst;
if (GetFileInformationByHandle(handle, &wst)) {
if ((filetype = GetFileType(handle))) {
memset(st, 0, sizeof(*st));
filetype = GetFileType(handle);
st->st_mode =
(S_IRUSR | S_IXUSR |
(!(wst.dwFileAttributes & kNtFileAttributeReadonly) ? S_IWUSR : 0) |
((wst.dwFileAttributes & kNtFileAttributeNormal) ? S_IFREG : 0) |
((wst.dwFileAttributes & kNtFileFlagOpenReparsePoint) ? S_IFLNK : 0) |
((wst.dwFileAttributes & kNtFileAttributeDirectory)
? S_IFDIR
: (((filetype == kNtFileTypeDisk) ? S_IFBLK : 0) |
((filetype == kNtFileTypeChar) ? S_IFCHR : 0) |
((filetype == kNtFileTypePipe) ? S_IFIFO : 0))));
st->st_atim = FileTimeToTimeSpec(wst.ftLastAccessFileTime);
st->st_mtim = FileTimeToTimeSpec(wst.ftLastWriteFileTime);
st->st_ctim = FileTimeToTimeSpec(wst.ftCreationFileTime);
st->st_size = (uint64_t)wst.nFileSizeHigh << 32 | wst.nFileSizeLow;
st->st_blksize = PAGESIZE;
st->st_dev = wst.dwVolumeSerialNumber;
st->st_ino = (uint64_t)wst.nFileIndexHigh << 32 | wst.nFileIndexLow;
st->st_nlink = wst.nNumberOfLinks;
if (GetFileInformationByHandleEx(handle, kNtFileCompressionInfo, &fci,
sizeof(fci))) {
actualsize = fci.CompressedFileSize;
} else {
actualsize = st->st_size;
switch (filetype) {
case kNtFileTypeChar:
st->st_mode = S_IFCHR | 0600;
break;
case kNtFileTypePipe:
st->st_mode = S_IFIFO | 0600;
break;
case kNtFileTypeDisk:
if (GetFileInformationByHandle(handle, &wst)) {
dprintf(1, "handle = %ld\n", handle);
st->st_mode =
(S_IRUSR | S_IXUSR |
(!(wst.dwFileAttributes & kNtFileAttributeReadonly) ? S_IWUSR
: 0) |
((wst.dwFileAttributes & kNtFileAttributeNormal) ? S_IFREG : 0) |
((wst.dwFileAttributes & kNtFileFlagOpenReparsePoint) ? S_IFLNK
: 0) |
((wst.dwFileAttributes & kNtFileAttributeDirectory) ? S_IFDIR
: 0));
st->st_atim = FileTimeToTimeSpec(wst.ftLastAccessFileTime);
st->st_mtim = FileTimeToTimeSpec(wst.ftLastWriteFileTime);
st->st_ctim = FileTimeToTimeSpec(wst.ftCreationFileTime);
st->st_size = (uint64_t)wst.nFileSizeHigh << 32 | wst.nFileSizeLow;
st->st_blksize = PAGESIZE;
st->st_dev = wst.dwVolumeSerialNumber;
st->st_ino = (uint64_t)wst.nFileIndexHigh << 32 | wst.nFileIndexLow;
st->st_nlink = wst.nNumberOfLinks;
if (GetFileInformationByHandleEx(handle, kNtFileCompressionInfo, &fci,
sizeof(fci))) {
actualsize = fci.CompressedFileSize;
} else {
actualsize = st->st_size;
}
st->st_blocks = roundup(actualsize, PAGESIZE) / 512;
}
break;
default:
break;
}
st->st_blocks = roundup(actualsize, PAGESIZE) / 512;
return 0;
} else {
return __winerr();