Syscalls - x86

Collaboration diagram for Syscalls - x86:

Macros
#define	SYSCALL_INTERRUPT_NR   0x80
	The interrupt number used to trigger a syscall.

Enumerations
enum	syscall_nr {   SYS_EXIT = 1 , SYS_FORK = 2 , SYS_READ = 3 , SYS_WRITE = 4 ,   SYS_OPEN = 5 , SYS_CLOSE = 6 , SYS_LSEEK = 19 , SYS_GETPID = 20 ,   SYS_KILL = 37 , SYS_BRK = 45 , SYS_STAT = 106 , SYS_LSTAT = 107 ,   SYS_FSTAT = 108 , SYS_SBRK = 463 , SYSCALL_COUNT }
	The list of available syscall vectors. More...

Detailed Description

x86 ABI

For convenience, our kernel's ABI is the same as Linux's:

Arguments

The arguments are passed in the following order:

‍eax, ebx, ecx, edx, esi, edi, ebp

The first argument (eax) is always the number of the syscall to call.

Return value

The return value is always stored inside the eax register.

Enumeration Type Documentation

syscall_nr

enum syscall_nr

To make porting already existing programs easier, our syscall numbers are copied 1:1 from Linux.

Note

Syscall numbers may differ depending on the architecture.

Enumerator
SYS_EXIT	exit()
SYS_FORK	fork()
SYS_READ	read()
SYS_WRITE	write()
SYS_OPEN	open()
SYS_CLOSE	close()
SYS_LSEEK	lseek()
SYS_GETPID	getpid()
SYS_KILL	kill()
SYS_BRK	brk()
SYS_STAT	stat()
SYS_LSTAT	lstat()
SYS_FSTAT	fstat()
SYS_SBRK	lstat()