process_vm_writev

transfer data between process address spaces

sys_process_vm_writev(pid_t pid, const struct iovec *lvec, unsigned long liovcnt, const struct iovec *rvec, unsigned long riovcnt, unsigned long flags)

number	331 (0x14b)
abi	common
entry point	`sys_process_vm_writev`
since	Linux 5.0
man page	process_vm_writev(2)
source	elixir.bootlin.com

Registers

register	value
`r20`	331, the syscall number
`r26`	pid_t pid
`r25`	const struct iovec *lvec
`r24`	unsigned long liovcnt
`r23`	const struct iovec *rvec
`r22`	unsigned long riovcnt
`r21`	unsigned long flags
`r28`	the return value

Then run ble 0x100(%sr2, %r0) to enter the kernel.

Same syscall on other architectures

x64 311
x86 348
arm64 271
arm 377
riscv64 271
x32 1073742364
loongarch64 271
ppc64 352
ppc 352
s390x 341
mips64 5305
mipsn32 6310
mipso32 4346
alpha 505
arc 271
csky 271
hexagon 271
m68k 346
microblaze 378
nios2 271
openrisc 271
sh 366
sparc 339
sparc64 339
xtensa 323

Get this as JSON: https://api.syscall.sh/v2/syscalls/parisc/process_vm_writev