readdir on ia32

read directory entry

compat_sys_old_readdir(unsigned int fd, struct old_linux_dirent *dirent, unsigned int count)

number	89 (0x59)
abi	i386
entry point	`compat_sys_old_readdir`
since	Linux 3.3 or earlier (3.3 is the first release scanned for ia32)
man page	readdir(2)
source	elixir.bootlin.com

Registers

register	value
`eax`	89, the syscall number
`ebx`	unsigned int fd
`ecx`	struct old_linux_dirent *dirent
`edx`	unsigned int count
`eax`	the return value

Then run int 0x80 to enter the kernel.

This compat ABI is only available when the kernel is built with CONFIG_IA32_EMULATION.