Syscall Table#

Instruction: syscall

Return value found in: %rax

Syscalls are implemented in functions named as in the Entry point column, or with the DEFINE_SYSCALLx(%name% macro.

Relevant man pages: syscall(2), syscalls(2)

x86 64bit:

NR

syscall name

references

%rax

arg0 (%rdi)

arg1 (%rsi)

arg2 (%rdx)

arg3 (%r10)

arg4 (%r8)

arg5 (%r9)

0

read

man/ cs/

0x00

unsigned int fd

char *buf

size_t count

-

-

-

1

write

man/ cs/

0x01

unsigned int fd

const char *buf

size_t count

-

-

-

2

open

man/ cs/

0x02

const char *filename

int flags

umode_t mode

-

-

-

3

close

man/ cs/

0x03

unsigned int fd

-

-

-

-

-

…

59

execve

man/ cs/

0x3b

const char *filename

const char *const *argv

const char *const *envp

-

-

-

60

exit

man/ cs/

0x3c

int error_code

-

-

-

-

-

…

https://chromium.googlesource.com/chromiumos/docs/+/master/constants/syscalls.md

https://github.com/torvalds/linux/blob/v3.13/arch/x86/syscalls/syscall_64.tbl

#
# 64-bit system call numbers and entry vectors
#
# The format is:
# <number> <abi> <name> <entry point>
#
# The abi is "common", "64" or "x32" for this file.
#
0	common	read			sys_read
1	common	write			sys_write
2	common	open			sys_open
3	common	close			sys_close

x86 32bit:

https://github.com/torvalds/linux/blob/v3.13/arch/x86/syscalls/syscall_32.tbl

#
# 32-bit system call numbers and entry vectors
#
# The format is:
# <number> <abi> <name> <entry point> <compat entry point>
#
# The abi is always "i386" for this file.
#
0	i386	restart_syscall		sys_restart_syscall
1	i386	exit			sys_exit
2	i386	fork			sys_fork			stub32_fork
3	i386	read			sys_read
4	i386	write			sys_write
5	i386	open			sys_open			compat_sys_open
6	i386	close			sys_close