Struct solana_rbpf::syscalls::BpfMemFrob

pub struct BpfMemFrob {}

Same as void *memfrob(void *s, size_t n); in string.h in C. See the GNU manual page (in section 3) for memfrob. The memory is directly modified, and the syscall returns 0 in all cases. Arguments 3 to 5 are unused.

Examples

use solana_rbpf::syscalls::{BpfMemFrob, Result};
use solana_rbpf::memory_region::{MemoryRegion, MemoryMapping};
use solana_rbpf::vm::{Config, SyscallObject};
use solana_rbpf::user_error::UserError;

let val = vec![0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x22, 0x33];
let val_va = 0x100000000;

let mut result: Result = Ok(0);
let config = Config::default();
let memory_mapping = MemoryMapping::new::<UserError>(vec![MemoryRegion::default(), MemoryRegion::new_from_slice(&val, val_va, 0, true)], &config).unwrap();
BpfMemFrob::call(&mut BpfMemFrob {}, val_va, 8, 0, 0, 0, &memory_mapping, &mut result);
assert_eq!(val, vec![0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x3b, 0x08, 0x19]);
BpfMemFrob::call(&mut BpfMemFrob {}, val_va, 8, 0, 0, 0, &memory_mapping, &mut result);
assert_eq!(val, vec![0x00, 0x00, 0x00, 0x00, 0x00, 0x11, 0x22, 0x33]);

Trait Implementations

impl SyscallObject<UserError> for BpfMemFrob

fn call(
    &mut self,
    vm_addr: u64,
    len: u64,
    _arg3: u64,
    _arg4: u64,
    _arg5: u64,
    memory_mapping: &MemoryMapping<'_>,
    result: &mut Result
)

Call the syscall function