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Add support for arm64 architecture #3

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Add support for arm64 architecture #3

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4bc1d75
Add support for arm64 architecture
tkan145 Feb 8, 2024
2bf78fb
Cast lua value to int before passing to C function
tkan145 Feb 16, 2024
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45 changes: 44 additions & 1 deletion lfs_ffi.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ local _M = {
-- common utils/constants
local IS_64_BIT = ffi.abi('64bit')
local ERANGE = 'Result too large'
local int = ffi.typeof("int")

ffi.cdef([[
char* strerror(int errnum);
Expand Down Expand Up @@ -909,7 +910,49 @@ if OS == 'Linux' then
lstat_syscall_num = IS_64_BIT and 4107 or 4214
end

if stat_syscall_num then
if ARCH == 'arm64' then
ffi.cdef([[
typedef struct {
unsigned long st_dev;
unsigned long st_ino;
unsigned int st_mode;
unsigned int st_nlink;
unsigned int st_uid;
unsigned int st_gid;
unsigned long st_rdev;
unsigned long __pad1;
long st_size;
int st_blksize;
int __pad2;
long st_blocks;
long st_atime;
unsigned long st_atime_nsec;
long st_mtime;
unsigned long st_mtime_nsec;
long st_ctime;
unsigned long st_ctime_nsec;
unsigned int __unused4;
unsigned int __unused5;
} stat;
]])

local STAT = {
_AT_FDCWD = -0x64,
_AT_REMOVEDIR = 0x200,
_AT_SYMLINK_NOFOLLOW = 0x100,
_AT_EACCESS = 0x200,
}

-- On arm64 stat and lstat do not exist as syscall, so use newfstatat instead
-- int newfstatat(int dirfd, const char *filename, struct stat *statbuf, int flags)
stat_func = function(filepath, buf)
return lib.syscall(79, int(STAT._AT_FDCWD), filepath, buf, 0)
end
lstat_func = function(filepath, buf)
return lib.syscall(79, int(STAT._AT_FDCWD), filepath, buf, int(STAT._AT_SYMLINK_NOFOLLOW))
end

elseif stat_syscall_num then
stat_func = function(filepath, buf)
return lib.syscall(stat_syscall_num, filepath, buf)
end
Expand Down