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fix: real argv[0] via SYS_GETEXECPATH - GCC driver finds its backends

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The GCC driver relocates its install prefix from argv[0]. crt1
hardcoded argv[0] as "prog", so make_relative_prefix cwd-joined it
and computed exec prefixes relative to the current directory
(0:/users/admin/../libexec/gcc/...), and because the computed
gcc_exec_prefix is non-NULL the standard /sdk prefixes were never
searched. cc1plus was unreachable from anywhere except (by accident
of the path arithmetic) 0:/sdk/bin. sdk-diag proved the kernel and
libc layers all worked; only the driver's self-relocation was lost.

New SYS_GETEXECPATH (151) returns the absolute path the process was
spawned from (Process::name); crt1 uses it for argv[0] with a "prog"
fallback. With a real argv[0], make_relative_prefix computes
0:/sdk/bin/../libexec/gcc/ from any cwd. Native GCC relinked against
the new crt1; sdk-diag ships in the SDK as a permanent probe; the
montauk.h TCC mirror gains the wrapper (checker enforced it).

Co-Authored-By: Claude Fable 5 <[email protected]>
This commit is contained in:
daniel
2026-07-17 10:43:59 +02:00
co-authored by Claude Fable 5
parent 2f1010b02e
commit 1c851a3627
12 changed files with 83 additions and 6 deletions
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programs/include/Api/Syscall.hpp
+4 -1
View File
@@ -204,7 +204,10 @@ namespace montauk::abi {
static constexpr uint64_t SYS_POWERINFO = 149; // (PowerInfo*) -> 0, -1 unsupported
// Framebuffer page flip (double-buffered scanout)
static constexpr uint64_t SYS_FBFLIP = 150; // (index, flags) -> new front index; index=-1 queries support (1/0); flags bit0 = wait vsync
static constexpr uint64_t SYS_FBFLIP = 150;
// Absolute path of the running executable (for argv[0]).
static constexpr uint64_t SYS_GETEXECPATH = 151; // (index, flags) -> new front index; index=-1 queries support (1/0); flags bit0 = wait vsync
// Tunable parameters (for SYS_SDR_SETPARAM / SYS_SDR_GETPARAM).
static constexpr int SDR_PARAM_FREQ = 0; // center frequency, Hz
programs/include/libc/montauk.h
+5
View File
@@ -174,6 +174,7 @@ extern "C" {
#define MTK_SYS_SDR_GETPARAM 148
#define MTK_SYS_POWERINFO 149
#define MTK_SYS_FBFLIP 150
#define MTK_SYS_GETEXECPATH 151
/* @SYSCALLS-END */
#define MTK_SOCK_TCP 1
@@ -410,6 +411,10 @@ static inline int mtk_getargs(char *buf, unsigned long max_len) {
return (int)_mtk_syscall2(MTK_SYS_GETARGS, (long)buf, (long)max_len);
}
static inline int mtk_getexecpath(char *buf, unsigned long maxLen) {
return (int)mtk_syscall2(MTK_SYS_GETEXECPATH, (long)buf, (long)maxLen);
}
static inline int mtk_chdir(const char *path) {
return (int)_mtk_syscall1(MTK_SYS_CHDIR, (long)path);
}