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Adds fgetat,fgettype,fgetmod. Seperates constants to multiple files

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Kwarde
2025-07-27 14:11:44 +02:00
parent 5b6831a501
commit dbf2af0253
8 changed files with 320 additions and 234 deletions
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7
src/console.asm
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@@ -112,9 +112,10 @@ eprintf:
; See printf description above, +
; 1) Return value can be amount of printed characters or -errno (eg if bad FD was passed, -EBADF is returned)
; 2) FD has to be passed via RAX (this is clearly an INTERNAL function so passed arguments are slightly different, that is, RAX required for FD)
; 3) <!> <!> FOR DEVS: When writing an I/O function that calls this wrapper, make sure that:
; 3) When writing a function(/wrapper) that calls this function, make sure that:
; - That function has function prologue (ie push rbp + mov rbp, rsp)
; - __INTERNAL_fmt is called via CALL and not a simple JMP like in printf
; - Arguments from function/wrapper are all shifted
; This is because in such I/O functions, first argument should be file descriptor, and following SYS V ABI, that first argument is passed to RDI
; However since __INTERNAL_fmt expects FD via RAX, all arguments have to be shifted. Due to this, argument in R9 becomes a stack argument
; Because of that, __INTERNAL_fmt has to load from stack with a different offset; +24 bytes extra (extra +8 for function call, extra +8 for function prologue and extra +8 to account for possible R9 arg becoming a stack arg)
@@ -126,8 +127,8 @@ __INTERNAL_fmt:
jmp %%continue
%%fromStack:
cmp r15, FD_stderr
jle %%stackNoShift ;simple jle (for test r15,2); entry of this wrapper quits early if passed FD is less than 1, so this simple check is safe enough
mov %1, [rbp + (RBP_OFFSET_CALLER*2 + SIZE_QWORD) + ((r14-5) * SIZE_QWORD)] ;non-printf functions calling __INTERNAL_fmt require RDI to be FD, all args shifted and rbp+RBP_OFFSET_CALLER to r9. Also requires function prologue and a CALL to __INTERNAL_fmt (not a JMP like in printf); hence the RBP_OFFSET_CALLER*2
jle %%stackNoShift
mov %1, [rbp + (RBP_OFFSET_CALLER*2 + SIZE_QWORD) + ((r14-5) * SIZE_QWORD)]
jmp %%continue
%%stackNoShift:
mov %1, [rbp + RBP_OFFSET_CALLER + ((r14-5) * SIZE_QWORD)]

191
src/constants.asm
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@@ -1,186 +1,5 @@
section .rodata
; syscall
NR_read equ 0
NR_write equ 1
NR_open equ 2
NR_close equ 3
NR_stat equ 4
NR_fstat equ 5
NR_lstat equ 6
NR_exit equ 60
NR_creat equ 85
NR_umask equ 95
; file descriptors
FD_stdin equ 0
FD_stdout equ 1
FD_stderr equ 2
; ASCII
EOS equ 0
TAB equ 9
NL equ 10
DQUO equ 34
; Sizes
RBP_OFFSET_CALLER equ 16
SIZE_QWORD equ 8
SIZE_DWORD equ 4
SIZE_WORD equ 2
SIZE_BYTE equ 1
MIN_UINT64 equ 0
MIN_UINT32 equ 0
MIN_UINT16 equ 0
MIN_UINT8 equ 0
MAX_UINT64 equ 0xFFFFFFFFFFFFFFFF
MAX_UINT32 equ 0xFFFFFFFF
MAX_UINT16 equ 0xFFFF
MAX_UINT8 equ 0xFF
MIN_INT64 equ ~0x7FFFFFFFFFFFFFFF
MIN_INT32 equ ~0x7FFFFFFF
MIN_INT16 equ ~0x7FFF
MIN_INT8 equ ~0x7F
MAX_INT64 equ 0x7FFFFFFFFFFFFFFF
MAX_INT32 equ 0x7FFFFFFF
MAX_INT16 equ 0x7FFF
MAX_INT8 equ 0x7F
; System error codes
ENONE equ 0
EPERM equ 1
ENOENT equ 2
ESRCH equ 3
EINTR equ 4
EIO equ 5
ENXIO equ 6
E2BIG equ 7
ENOEXEC equ 8
EBADF equ 9
ECHILD equ 10
EAGAIN equ 11
ENOMEM equ 12
EACCES equ 13
EFAULT equ 14
ENOTBLK equ 15
EBUSY equ 16
EEXIST equ 17
EXDEV equ 18
ENODEV equ 19
ENOTDIR equ 20
EISDIR equ 21
EINVAL equ 22
ENFILE equ 23
EMFILE equ 24
ENOTTY equ 25
ETXTBSY equ 26
EFBIG equ 27
ENOSPC equ 28
ESPIPE equ 29
EROFS equ 30
EMLINK equ 31
EPIPE equ 32
EDOM equ 33
ERANGE equ 34
EDEADLK equ 35
ENAMETOOLONG equ 36
ENOLCK equ 37
ENOSYS equ 38
ENOTEMPTY equ 39
ELOOP equ 40
EWOULDBLOCK equ EAGAIN
ENOMSG equ 42
EIDRM equ 43
ECHRNG equ 44
EL2NSYNC equ 45
EL3HLT equ 46
EL3RST equ 47
ELNRNG equ 48
EUNATCH equ 49
ENOCSI equ 50
EL2HLT equ 51
EBADE equ 52
EBADR equ 53
EXFULL equ 54
ENOANO equ 55
EBADRQC equ 56
EBADSLT equ 57
EDEADLOCK equ EDEADLK
EBFONT equ 59
ENOSTR equ 60
ENODATA equ 61
ETIME equ 62
ENOSR equ 63
ENONET equ 64
ENOPKG equ 65
EREMOTE equ 66
ENOLINK equ 67
EADV equ 68
ESRMNT equ 69
ECOMM equ 70
EPROTO equ 71
EMULTIHOP equ 72
EDOTDOT equ 73
EBADMSG equ 74
EOVERFLOW equ 75
ENOTUNIQ equ 76
EBADFD equ 77
EREMCHG equ 78
ELIBACC equ 79
ELIBBAD equ 80
ELIBSCN equ 81
ELIBMAX equ 82
ELIBEXEC equ 83
EILSEQ equ 84
ERESTART equ 85
ESTRPIPE equ 86
EUSERS equ 87
ENOTSOCK equ 88
EDESTADDRREQ equ 89
EMSGSIZE equ 90
EPROTOTYPE equ 91
ENOPROTOOPT equ 92
EPROTONOSUPPORT equ 93
ESOCKTNOSUPPORT equ 94
EOPNOTSUPP equ 95
EPFNOSUPPORT equ 96
EAFNOSUPPORT equ 97
EADDRINUSE equ 98
EADDRNOTAVAIL equ 99
ENETDOWN equ 100
ENETUNREACH equ 101
ENETRESET equ 102
ECONNABORTED equ 103
ECONNRESET equ 104
ENOBUFS equ 105
EISCONN equ 106
ENOTCONN equ 107
ESHUTDOWN equ 108
ETOOMANYREFS equ 109
ETIMEDOUT equ 110
ECONNREFUSED equ 111
EHOSTDOWN equ 112
EHOSTUNREACH equ 113
EALREADY equ 114
EINPROGRESS equ 115
ESTALE equ 116
EUCLEAN equ 117
ENOTNAM equ 118
ENAVAIL equ 119
EISNAM equ 120
EREMOTEIO equ 121
EDQUOT equ 122
ENOMEDIUM equ 123
EMEDIUMTYPE equ 124
ECANCELED equ 125
ENOKEY equ 126
EKEYEXPIRED equ 127
EKEYREVOKED equ 128
EKEYREJECTED equ 129
EOWNERDEAD equ 130
ENOTRECOVERABLE equ 131
ERFKILL equ 132
EHWPOISON equ 133
%include "src/constants/common.asm"
%include "src/constants/syscalls.asm"
%include "src/constants/errors.asm"
%include "src/constants/sizes.asm"
%include "src/constants/file.asm"

11
src/constants/common.asm Normal file
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@@ -0,0 +1,11 @@
section .rodata
; file descriptors
FD_stdin equ 0
FD_stdout equ 1
FD_stderr equ 2
; ASCII
EOS equ 0
TAB equ 9
NL equ 10
DQUO equ 34

135
src/constants/errors.asm Normal file
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@@ -0,0 +1,135 @@
section .rodata
ENONE equ 0
EPERM equ 1
ENOENT equ 2
ESRCH equ 3
EINTR equ 4
EIO equ 5
ENXIO equ 6
E2BIG equ 7
ENOEXEC equ 8
EBADF equ 9
ECHILD equ 10
EAGAIN equ 11
ENOMEM equ 12
EACCES equ 13
EFAULT equ 14
ENOTBLK equ 15
EBUSY equ 16
EEXIST equ 17
EXDEV equ 18
ENODEV equ 19
ENOTDIR equ 20
EISDIR equ 21
EINVAL equ 22
ENFILE equ 23
EMFILE equ 24
ENOTTY equ 25
ETXTBSY equ 26
EFBIG equ 27
ENOSPC equ 28
ESPIPE equ 29
EROFS equ 30
EMLINK equ 31
EPIPE equ 32
EDOM equ 33
ERANGE equ 34
EDEADLK equ 35
ENAMETOOLONG equ 36
ENOLCK equ 37
ENOSYS equ 38
ENOTEMPTY equ 39
ELOOP equ 40
EWOULDBLOCK equ EAGAIN
ENOMSG equ 42
EIDRM equ 43
ECHRNG equ 44
EL2NSYNC equ 45
EL3HLT equ 46
EL3RST equ 47
ELNRNG equ 48
EUNATCH equ 49
ENOCSI equ 50
EL2HLT equ 51
EBADE equ 52
EBADR equ 53
EXFULL equ 54
ENOANO equ 55
EBADRQC equ 56
EBADSLT equ 57
EDEADLOCK equ EDEADLK
EBFONT equ 59
ENOSTR equ 60
ENODATA equ 61
ETIME equ 62
ENOSR equ 63
ENONET equ 64
ENOPKG equ 65
EREMOTE equ 66
ENOLINK equ 67
EADV equ 68
ESRMNT equ 69
ECOMM equ 70
EPROTO equ 71
EMULTIHOP equ 72
EDOTDOT equ 73
EBADMSG equ 74
EOVERFLOW equ 75
ENOTUNIQ equ 76
EBADFD equ 77
EREMCHG equ 78
ELIBACC equ 79
ELIBBAD equ 80
ELIBSCN equ 81
ELIBMAX equ 82
ELIBEXEC equ 83
EILSEQ equ 84
ERESTART equ 85
ESTRPIPE equ 86
EUSERS equ 87
ENOTSOCK equ 88
EDESTADDRREQ equ 89
EMSGSIZE equ 90
EPROTOTYPE equ 91
ENOPROTOOPT equ 92
EPROTONOSUPPORT equ 93
ESOCKTNOSUPPORT equ 94
EOPNOTSUPP equ 95
EPFNOSUPPORT equ 96
EAFNOSUPPORT equ 97
EADDRINUSE equ 98
EADDRNOTAVAIL equ 99
ENETDOWN equ 100
ENETUNREACH equ 101
ENETRESET equ 102
ECONNABORTED equ 103
ECONNRESET equ 104
ENOBUFS equ 105
EISCONN equ 106
ENOTCONN equ 107
ESHUTDOWN equ 108
ETOOMANYREFS equ 109
ETIMEDOUT equ 110
ECONNREFUSED equ 111
EHOSTDOWN equ 112
EHOSTUNREACH equ 113
EALREADY equ 114
EINPROGRESS equ 115
ESTALE equ 116
EUCLEAN equ 117
ENOTNAM equ 118
ENAVAIL equ 119
EISNAM equ 120
EREMOTEIO equ 121
EDQUOT equ 122
ENOMEDIUM equ 123
EMEDIUMTYPE equ 124
ECANCELED equ 125
ENOKEY equ 126
EKEYEXPIRED equ 127
EKEYREVOKED equ 128
EKEYREJECTED equ 129
EOWNERDEAD equ 130
ENOTRECOVERABLE equ 131
ERFKILL equ 132
EHWPOISON equ 133

73
src/constants/file.asm Normal file
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@@ -0,0 +1,73 @@
section .rodata
; Open flags
O_ACCMODE equ 00000003q
O_RDONLY equ 00000000q
O_WRONLY equ 00000001q
O_RDWR equ 00000002q
O_CREAT equ 00000100q ;create if not exist
O_EXCL equ 00000200q ;fail if file exists and O_EXCL+O_CREAT set
O_NOCTTY equ 00000400q
O_TRUNC equ 00001000q
O_APPEND equ 00002000q
O_NONBLOCK equ 00004000q
O_DSYNC equ 00010000q
FASYNC equ 00020000q
O_DIRECT equ 00040000q
O_LARGEFILE equ 00100000q
O_DIRECTORY equ 00200000q
O_NOFOLLOW equ 00400000q
O_NOATIME equ 01000000q
O_CLOEXEC equ 02000000q
__O_SYNC equ 04000000q
O_SYNC equ (__O_SYNC | O_DSYNC)
O_PATH equ 01000000q
__O_TMPFILE equ 02000000q
O_TMPFILE equ (__O_TMPFILE | O_DIRECTORY)
O_NDELAY equ O_NONBLOCK
; Permission flags
S_IXOTH equ 00001q ;o=x
S_IWOTH equ 00002q ;o=w
S_IROTH equ 00004q ;o=r
S_IRWXO equ 00007q ;o=rwx
S_IXGRP equ 00010q ;g=x
S_IWGRP equ 00020q ;g=w
S_IRGRP equ 00040q ;g=r
S_IRWXG equ 00070q ;g=rwx
S_IXUSR equ 00100q ;u=x
S_IWUSR equ 00200q ;u=w
S_IRUSR equ 00400q ;u=r
S_IRWXU equ 00700q ;u=rwx
S_ISVTX equ 0001000q ;sticky bit
S_ISGID equ 0002000q ;set-group-ID bit
S_ISUID equ 0004000q ;set-user-ID bit
; Stat buffer fields
ST_DEV equ 0 ; Device
ST_INO equ 8 ; File serial number
ST_NLINK equ 16
ST_MODE equ 24 ; File mode
ST_UID equ 28 ; User ID of the file's owner
ST_GID equ 32 ; Group ID of the file's group
ST__PAD0 equ 36
ST_RDEV equ 40 ; Device number, if device
ST_SIZE equ 48 ; Size of file, in bytes
ST_BLKSIZE equ 56 ; Optimal block size for I/O
ST_BLOCKS equ 64 ; Number 512-byte blocks allocated
ST_ATIME equ 72 ; Time of last access
ST_ATIME_NSEC equ 80
ST_MTIME equ 88 ; Time of last modification
ST_MTIME_NSEC equ 96
ST_CTIME equ 104 ; Time of last status change
ST_CTIME_NSEC equ 112
ST__UNUSED equ 120
ST__END equ 128 ; End of stat buffer
STATBUFF_SIZE equ ST__END
AT_FDCWD equ -100
; File types
S_IFDIR equ 0040000q ; Directory
S_IFCHR equ 0020000q ; Character device
S_IFBLK equ 0060000q ; Block device
S_IFREG equ 0100000q ; Regular file
S_IFIFO equ 0010000q ; FIFO
S_IFLNK equ 0120000q ; Symbolic link
S_IFSOCK equ 0140000q ; Socket

26
src/constants/sizes.asm Normal file
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@@ -0,0 +1,26 @@
section .rodata
RBP_OFFSET_CALLER equ 16
SIZE_QWORD equ 8
SIZE_DWORD equ 4
SIZE_WORD equ 2
SIZE_BYTE equ 1
MIN_UINT64 equ 0
MIN_UINT32 equ 0
MIN_UINT16 equ 0
MIN_UINT8 equ 0
MAX_UINT64 equ 0xFFFFFFFFFFFFFFFF
MAX_UINT32 equ 0xFFFFFFFF
MAX_UINT16 equ 0xFFFF
MAX_UINT8 equ 0xFF
MIN_INT64 equ ~0x7FFFFFFFFFFFFFFF
MIN_INT32 equ ~0x7FFFFFFF
MIN_INT16 equ ~0x7FFF
MIN_INT8 equ ~0x7F
MAX_INT64 equ 0x7FFFFFFFFFFFFFFF
MAX_INT32 equ 0x7FFFFFFF
MAX_INT16 equ 0x7FFF
MAX_INT8 equ 0x7F

12
src/constants/syscalls.asm Normal file
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@@ -0,0 +1,12 @@
section .rodata
NR_read equ 0
NR_write equ 1
NR_open equ 2
NR_close equ 3
;NR_stat equ 4
NR_fstat equ 5
NR_lstat equ 6
NR_exit equ 60
NR_creat equ 85
NR_umask equ 95
NR_newfstatat equ 262

99
src/file.asm
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@@ -5,57 +5,66 @@ extern __INTERNAL_fmt
extern strlen
extern umask_get
section .rodata
; Open flags
O_ACCMODE equ 00000003q
O_RDONLY equ 00000000q
O_WRONLY equ 00000001q
O_RDWR equ 00000002q
O_CREAT equ 00000100q ;create if not exist
O_EXCL equ 00000200q ;fail if file exists and O_EXCL+O_CREAT set
O_NOCTTY equ 00000400q
O_TRUNC equ 00001000q
O_APPEND equ 00002000q
O_NONBLOCK equ 00004000q
O_DSYNC equ 00010000q
FASYNC equ 00020000q
O_DIRECT equ 00040000q
O_LARGEFILE equ 00100000q
O_DIRECTORY equ 00200000q
O_NOFOLLOW equ 00400000q
O_NOATIME equ 01000000q
O_CLOEXEC equ 02000000q
__O_SYNC equ 04000000q
O_SYNC equ (__O_SYNC | O_DSYNC)
O_PATH equ 01000000q
__O_TMPFILE equ 02000000q
O_TMPFILE equ (__O_TMPFILE | O_DIRECTORY)
O_NDELAY equ O_NONBLOCK
; Permission flags
S_IXOTH equ 00001q ;o=x
S_IWOTH equ 00002q ;o=w
S_IROTH equ 00004q ;o=r
S_IRWXO equ 00007q ;o=rwx
S_IXGRP equ 00010q ;g=x
S_IWGRP equ 00020q ;g=w
S_IRGRP equ 00040q ;g=r
S_IRWXG equ 00070q ;g=rwx
S_IXUSR equ 00100q ;u=x
S_IWUSR equ 00200q ;u=w
S_IRUSR equ 00400q ;u=r
S_IRWXU equ 00700q ;u=rwx
S_ISVIX equ 0001000q ;sticky bit
S_ISGID equ 0002000q ;set-group-ID bit
S_ISUID equ 0004000q ;set-user-ID bit
section .bss
section .text
global fstatat
global fgetmod
global fopen
global fclose
global fexist
global fwrite
;----- fstatat(*file[], *statBuffer[]) -----;
; Gets information from a file, stores it into statBuffer[]
; Return value: 0 if stats received, -errno otherwise
; Used registers:
; rax* (ret)
; rdi* (arg) Pointer to file
; rsi* (arg) Pointer to statBuffer
; rdx* arg for syscall NR_newfstatat
; r10* arg(flag) for syscall NR_newfstatat
fstatat:
sub rsp, SIZE_QWORD
mov rax, NR_newfstatat
mov rdx, rsi
mov rsi, rdi
mov rdi, AT_FDCWD
xor r10, r10
syscall
add rsp, SIZE_QWORD
ret
;----- fgettype(*statBuffer[]) -----;
; Gets file type from stat buffer
; Return value: Permissions of given file or -EINVAL if statBuffer is invalid (first bit is 0)
; Used registers:
; rax* (ret)
; rdi (arg) Pointer to statBuffer[]
fgettype:
cmp byte [rdi], 0
jne .buffok
mov rax, -EINVAL
ret
.buffok:
mov rax, [rdi + ST_MODE]
and rax, 0xF000
ret
;----- fgetmod(*statBuffer[]) -----;
; Gets file mode bits (file permissions) from stat buffer
; Return value: Permissions of given file or -EINVAL if statBuffer is invalid (first bit is 0)
; Used registers:
; rax* (ret)
; rdi (arg) Pointer to stat buffer
fgetmod:
cmp byte [rdi], 0
jne .buffok
mov rax, -EINVAL
ret
.buffok:
mov rax, [rdi + ST_MODE]
and rax, 0x0FFF
ret
;----- fopen(*file[], char mode) -----;
; Opens a file
; Return value: Pointer to opened file pointer, -errno otherwise