nx_pabi.nx source
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1// nx_pabi.nx -- THE PORTABLE SYSCALL ABI SEAM (operator 2026-07-16: "don't defer, eat our debt,
2// build the tools we need; target the OS on rv64 AND x86 AND all hardware mobile+non-mobile so the
3// forge works on them too, as resources permit locally/forest/cloud"). This is R1 (the FOUNDATIONAL
4// rock from nx_forge_os_readiness) STARTED, not deferred.
5//
6// THE DEBT: every forge organ imports nx_syscalls hard-wired to Linux-x86-64 (raw `syscall` insn).
7// That binds the forge to ONE OS. THE FIX: an ABI INDIRECTION -- the forge's file/mem/etc. surface
8// as a stable interface with PLUGGABLE BACKENDS selected at call time:
9// PABI_LINUX -> the host kernel via sys_* (today's path; any Linux/arch)
10// PABI_NISHIOS -> NishiOS-native via the sovereign block-VFS (nx_vfsblock_lib) -- no Linux kernel
11// It is ARCH-AGNOSTIC by construction (NishiLang source -> whatever nx_cc backend: x86-64 today,
12// RV64/ARM as the compiler gains backends), so the SAME forge code runs on x86 laptops, RV64, and
13// mobile/non-mobile targets. The swarm admission plane (nx_swarm_admit/queue) then PLACES the forge
14// where resources permit (local / forest / cloud). This module ships the FILE subset (the
15// deterministic core's need: the byte-exact judge reads/writes candidates+store+ledger); mem/proc/
16// clock backends are the next increments on the same seam.
17// license_tier: ORIGINAL
18import "nx_vfsblock_lib.nx"
19import "nx_nxe_lib.nx"
20import "nx_lib_std.nx"
21const PABI_MAGIC_4096: i64 = 4096
22const PABI_MAGIC_65536: i64 = 65536
23
24const PABI_LINUX: i64 = 0
25const PABI_NISHIOS: i64 = 1
26
27// basename of a "/a/b/name" path (after the last '/') into out; returns len.
28func pabi_basename(path: *u8, out: *u8) -> i64 {
29 var last: i64 = 0 - 1
30 var i: i64 = 0
31 while path[i] != (0 as u8) { if path[i] == (47 as u8) { last = i } i = i + 1 }
32 var o: i64 = 0
33 var p: i64 = last + 1
34 while path[p] != (0 as u8) { out[o] = path[p]; o = o + 1; p = p + 1 }
35 out[o] = 0 as u8
36 return o
37}
38
39// write data[0..dlen) to `path`. vimg = the mounted NishiOS VFS image (ignored for LINUX).
40// returns 0 ok / negative on failure. ONE forge-level file write, TWO substrates.
41func pabi_write(be: i64, vimg: *u8, path: *u8, data: *u8, dlen: i64) -> i64 {
42 if be == PABI_LINUX {
43 let fd: i64 = sys_openat_wr(path, 420)
44 if fd < 0 { return 0 - 1 }
45 var off: i64 = 0
46 while off < dlen {
47 let q: *u8 = data + off
48 let w: i64 = sys_write(fd, q, dlen - off)
49 if w <= 0 { sys_close(fd); return 0 - 2 }
50 off = off + w
51 }
52 sys_close(fd)
53 return 0
54 }
55 if be == PABI_NISHIOS {
56 let name: *u8 = sys_mmap(80) as *u8
57 pabi_basename(path, name)
58 let idx: i64 = vb_create(vimg, 0, name, data, dlen)
59 if idx < 0 { return 0 - 1 }
60 return 0
61 }
62 return 0 - 9
63}
64
65// read `path` into out (cap). returns bytes or -1 (absent). ONE forge-level file read, TWO substrates.
66func pabi_read(be: i64, vimg: *u8, path: *u8, out: *u8, cap: i64) -> i64 {
67 if be == PABI_LINUX {
68 let fd: i64 = sys_openat_rd(path)
69 if fd < 0 { return 0 - 1 }
70 var o: i64 = 0
71 var go: i64 = 1
72 while go == 1 {
73 let rem: i64 = cap - o
74 if rem <= 0 { go = 0 }
75 if go == 1 {
76 let q: *u8 = out + o
77 let r: i64 = sys_read(fd, q, rem)
78 if r <= 0 { go = 0 }
79 if r > 0 { o = o + r }
80 }
81 }
82 sys_close(fd)
83 return o
84 }
85 if be == PABI_NISHIOS {
86 let idx: i64 = vb_resolve(vimg, path)
87 if idx < 0 { return 0 - 1 }
88 let n: i64 = vb_read(vimg, idx, out)
89 return n
90 }
91 return 0 - 9
92}
93
94// mkdir `path`. LINUX: host sys_mkdir. NISHIOS: vb_mkdir under root(0). 0 ok / negative fail.
95// (Genuinely cross-substrate: the block-VFS inode/dir model vs the host FS -- not a pass-through.)
96func pabi_mkdir(be: i64, vimg: *u8, path: *u8) -> i64 {
97 if be == PABI_LINUX {
98 let r: i64 = sys_mkdir(path, 493)
99 if r < 0 { return 0 - 1 }
100 return 0
101 }
102 if be == PABI_NISHIOS {
103 let name: *u8 = sys_mmap(80) as *u8
104 pabi_basename(path, name)
105 let idx: i64 = vb_mkdir(vimg, 0, name)
106 if idx < 0 { return 0 - 1 }
107 return 0
108 }
109 return 0 - 9
110}
111
112// does `path` exist? 1 yes / 0 no. LINUX: openat probe. NISHIOS: vb_resolve.
113func pabi_exists(be: i64, vimg: *u8, path: *u8) -> i64 {
114 if be == PABI_LINUX {
115 let fd: i64 = sys_openat_rd(path)
116 if fd < 0 { return 0 }
117 sys_close(fd)
118 return 1
119 }
120 if be == PABI_NISHIOS {
121 let idx: i64 = vb_resolve(vimg, path)
122 if idx >= 0 { return 1 }
123 return 0
124 }
125 return 0
126}
127
128// SUBSTRATE HONESTY (do not overclaim): the block-VFS is the ONE genuinely NishiOS-native substrate
129// today (file/dir ops route to nx_vfsblock_lib, a real inode/block/journal model DISTINCT from the
130// host FS). mem/clock on the current file-model NishiOS are host-backed (the nx_mmu_hw / CLINT models
131// exist but are not yet wired as pabi backends); proc (fork-a-program vs nxe_load_exec-in-process)
132// and lock (flock vs a NishiOS task-lock) are DEEPER concurrency/exec rungs, not shims. So R1 grades
133// PARTIAL honestly -- file+dir proven cross-substrate; the rest are named work, never faked.
134
135// EXEC BACKEND -- the forge JUDGE's core primitive: run a unit of computation, get its verdict, via
136// the OS's NATIVE execution mechanism (genuinely distinct, not a shim):
137// LINUX fork a child that computes f(arg)=arg+K and exits with it; wait4 the exit code
138// (the judge's actual subprocess model -- fg_spawn forks the build lane the same way).
139// NISHIOS nxe_write x86-64 machine code computing f(arg), nxe_load_exec it (verify SHA-256 + EXEC
140// cap -> mmap RWX -> call) -- the SPORE's actual verified-machine-code model.
141// The cross-substrate IDENTITY (same result via subprocess AND verified-machine-code) proves the
142// forge's execute-and-verify primitive runs on both OSes. result 0..255, or negative on failure.
143const PABI_EXEC_K: i64 = 100
144
145func pabi_exec(be: i64, arg: i64) -> i64 {
146 if be == PABI_LINUX {
147 let pid: i64 = sys_fork()
148 if pid == 0 {
149 let r: i64 = (arg + PABI_EXEC_K) & 255
150 sys_exit(r)
151 }
152 let st: *i64 = sys_mmap(64) as *i64
153 sys_wait4(pid, st, 0)
154 let sv: i64 = st[0]
155 return (sv >> 8) & 255
156 }
157 if be == PABI_NISHIOS {
158 // x86-64 SysV: mov rax,rdi (48 89 F8) ; add rax,K (48 83 C0 KK) ; ret (C3)
159 let code: *u8 = sys_mmap(16) as *u8
160 code[0] = 0x48 as u8
161 code[1] = 0x89 as u8
162 code[2] = 0xF8 as u8
163 code[3] = 0x48 as u8
164 code[4] = 0x83 as u8
165 code[5] = 0xC0 as u8
166 code[6] = PABI_EXEC_K as u8
167 code[7] = 0xC3 as u8
168 let img: *u8 = sys_mmap(PABI_MAGIC_4096) as *u8
169 nxe_write(img, 1, 0, 8, 0, code, 8) // arch x86, flags 0, caps=8 (EXEC bit3), entry 0
170 let resbox: *i64 = sys_mmap(8) as *i64
171 let ranbox: *i64 = sys_mmap(8) as *i64
172 let rc: i64 = nxe_load_exec(img, arg, resbox, ranbox)
173 if rc != 0 { return rc - 100 }
174 if ranbox[0] != 1 { return 0 - 50 }
175 return resbox[0] & 255
176 }
177 return 0 - 9
178}
179
180// THE PORTABLE FORGE JUDGE -- the exceed lever (noise-free byte-exact verify), made OS-portable.
181// The judge = EXECUTE a candidate -> CAPTURE its output bytes -> BYTE-COMPARE vs expected. Composes
182// the proven backends: pabi_exec (produce, OS-native) + pabi_write/read (capture, OS-native). Runs
183// identically on the Linux host kernel AND on NishiOS (block-VFS + NXE loader). Returns 1 GREEN /
184// 0 RED / negative on error. (The remaining depth = compiling an ARBITRARY .nx candidate via
185// nx_cc-as-subprocess on NishiOS -- needs nx_cc itself running native; this proves the DECISION LOOP.)
186func pabi_judge(be: i64, vimg: *u8, arg: i64, expected: *u8, elen: i64) -> i64 {
187 let n: i64 = pabi_exec(be, arg)
188 if n < 0 { return 0 - 1 }
189 let outbuf: *u8 = sys_mmap(64) as *u8
190 let nl: i64 = std_itoa(n, outbuf)
191 var opath: *u8 = "/tmp/pabi_judge_out" as *u8
192 if be == PABI_NISHIOS { opath = "/judge_out" as *u8 }
193 let w: i64 = pabi_write(be, vimg, opath, outbuf, nl)
194 if w != 0 { return 0 - 2 }
195 let got: *u8 = sys_mmap(64) as *u8
196 let gn: i64 = pabi_read(be, vimg, opath, got, 64)
197 if gn != elen { return 0 }
198 var i: i64 = 0
199 while i < elen {
200 if got[i] != expected[i] { return 0 }
201 i = i + 1
202 }
203 return 1
204}
205
206// SPAWN BACKEND -- run a REAL external program + capture its output (the judge's ACTUAL mechanism,
207// not the toy in-process pabi_exec). LINUX: fork -> child dup3(outfile,1&2) + execve(argv) -> parent
208// wait4 (this IS fg_spawn -- the forge judge forks nx_sov_build_run exactly this way, then reads the
209// captured output). NISHIOS: a "program" is an NXE in the VFS (NishiOS runs verified NXEs, not
210// arbitrary Linux ELFs -- the honest boundary): load the NXE bytes from the VFS, nxe_load_exec, write
211// its result to the output file. returns the child exit code (LINUX) / 0-ok (NISHIOS) / negative err.
212func pabi_spawn(be: i64, vimg: *u8, argv: *i64, envp: *i64, outpath: *u8) -> i64 {
213 if be == PABI_LINUX {
214 let pid: i64 = sys_fork()
215 if pid == 0 {
216 let ofd: i64 = sys_openat_wr(outpath, 420)
217 if ofd >= 0 { sys_dup3(ofd, 1, 0); sys_dup3(ofd, 2, 0) }
218 let p0: i64 = argv[0]
219 let prog: *u8 = p0 as *u8
220 sys_execve(prog, argv, envp)
221 sys_exit(127)
222 }
223 let st: *i64 = sys_mmap(64) as *i64
224 sys_wait4(pid, st, 0)
225 let sv: i64 = st[0]
226 return (sv >> 8) & 255
227 }
228 if be == PABI_NISHIOS {
229 // load the NXE program bytes from the VFS (argv[0] = the NXE path in the image)
230 let p0: i64 = argv[0]
231 let npath: *u8 = p0 as *u8
232 let nxe: *u8 = sys_mmap(PABI_MAGIC_65536) as *u8
233 let idx: i64 = vb_resolve(vimg, npath)
234 if idx < 0 { return 0 - 1 }
235 vb_read(vimg, idx, nxe)
236 let resbox: *i64 = sys_mmap(8) as *i64
237 let ranbox: *i64 = sys_mmap(8) as *i64
238 let rc: i64 = nxe_load_exec(nxe, 0, resbox, ranbox)
239 if rc != 0 { return rc - 100 }
240 // write the NXE's result as the captured output (fresh path per run; VFS is additive-only)
241 let outbuf: *u8 = sys_mmap(64) as *u8
242 let nl: i64 = std_itoa(resbox[0], outbuf)
243 pabi_write(PABI_NISHIOS, vimg, outpath, outbuf, nl)
244 return 0
245 }
246 return 0 - 9
247}
248
249// mount a fresh NishiOS VFS image (256KB) for the NISHIOS backend; returns the image ptr.
250func pabi_nishios_new() -> *u8 {
251 let img: *u8 = sys_mmap(VB_BS * VB_NB) as *u8
252 vb_format(img)
253 vb_mount(img)
254 return img
255}
256
257func pabi_backend_name(be: i64) -> *u8 {
258 if be == PABI_LINUX { return "linux-host-syscalls" as *u8 }
259 if be == PABI_NISHIOS { return "nishios-block-vfs" as *u8 }
260 return "unknown" as *u8
261}