code wiki / _hdl_build / _umode_gate.nx
_umode_gate.nx
buildroot/runtime/_hdl_build/_umode_gate.nx
about
_umode_gate.nx -- gate for U-MODE PROGRAM + SYSCALL boundary (user/kernel separation). NO mocks.
(1) U-MODE SYSCALL -- emits + runs nx_umode_emit: M-mode drops to U via mret, the U-mode user
program executes `ecall`, the CPU traps to the M-mode kernel with mcause=8 (ecall-from-U),
and the handler confirms it -> serial "U8" + clean halt.
(2) CONTROL -- re-emit with MPP=M (0x1800): mret stays in M, so the `ecall` is from M-mode ->
mcause=11 (not 8) -> handler emits "X8" not "U8". Proves "U8" REQUIRES the syscall to come
from U-mode (the privilege/cause distinction is real).
Evidence -> knowledge/status/priv.log (UMODEGATE row). Sovereign. license_tier: ORIGINAL
dependencies 1 imports · 0 importers
imports: nx_syscalls.nx
imported by: nobody (leaf or entry point)
call flow from main pre-order; caps 40 nodes / depth 6 declared; ↻ = already shown
structs
| none |
consts
| 13 | const U_EMIT: *u8 = "_offc/nx_umode_emit.elf" |
| 14 | const U_SOV: *u8 = "_offc/nx_boot_run_sov.elf" |
| 15 | const U_BIN: *u8 = "runtime/_hdl_build/_umode_virt.bin" |
functions
| 17 | func g_p(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 } |
| 18 | func g_fp(fd: i64, s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(fd,s,n); return 0 } |
| 19 | func g_fn(fd: i64, v: i64) -> i64 { let bb: *u8=sys_mmap(28); var m: i64=v; if m<0{m=0-m}; let t: *u8=sys_mmap(28); var k: i64=0; if m==0{t[0]=48;k=1}; while m>0{t[k]=(48+(m%10)) as u8;m=m/10;k=k+1}; var i: i64=0; while i<k{bb[i]=t[k-1-i];i=i+1}; sys_write(fd,bb,k); return 0 } |
| 21 | func g_run(prog: *u8, a1: *u8, a2: *u8, outpath: *u8) -> i64 |
| 42 | func g_read(path: *u8, buf: *u8, cap: i64) -> i64 |
| 51 | func g_has(buf: *u8, n: i64, pat: *u8, pl: i64) -> i64 called by 1: main |
| 58 | func main() -> i64 |