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David
1d67426ede
Export getopt (VUtibKJCt1o) and getopt_long (8VVXJxB5nlk) from libSceLibcInternal together with the guest variables optind (zCnSJWp-Qj8), optarg (zG0BNJOZdm4), opterr (yaFXXViLWPw), optopt (FwzVaZ8Vnus) and optreset (CZNm+oNmB-I). The NIDs were computed with tools/nid_names.py and all seven are in aerolib; the PS5 payload SDK f5d40f02 lists the functions and the five objects in sce_stubs/libSceLibcInternal.c. Titles (predicted stops from registry order, not observed runs): - XPSemu PPSA97358, after execv/execve, the signal waits, the credential setters, mlockall and tcsendbreak: "FAIL: unresolved ELF import VUtibKJCt1o from libSceLibcInternal.prx" (getopt idx 204, 10 call sites from 0xF6C23D), then optind (207), optreset (208), optarg (209). - RetroArch PPSA99169: getopt_long (idx 554, call sites 0xD2FC0C, 0xD3002A), optind (553), optarg (555). Behaviour follows FreeBSD release/11.4.0 8c639945: getopt is lib/libc/stdlib/getopt.c (no permutation, GNU "::" optional argument, lone "-" as an option when listed), getopt_long is getopt_internal from lib/libc/stdlib/getopt_long.c with GNU_COMPATIBLE (permutation, POSIXLY_CORRECT read through the guest getenv on the first call and on optreset, "+" and "-" prefixes, "W;", optind 0 as a reset, abbreviation and ambiguity rules and the GNU warning texts). Warnings are written to the guest stderr stream as "<__progname>: <message>", as warnx does. The struct option layout and argument kinds are include/getopt.h. The code lives in libSceLibcInternal because __progname is a libkernel export that libc cannot link. A null getopt option string, a null argument vector or argument, a negative optind and an optind moved inside a pending permutation throw where FreeBSD faults. getopt_long_only is not exported. guest_getopt runs the FreeBSD getopt_test cases (contrib/netbsd-tests t_getopt.sh with the h_getopt and h_getopt_long result format) plus grouped and optional arguments, "--", permutation order, "+" and "-" prefixes, optreset and optind 0 restarts, POSIXLY_CORRECT, all three long argument kinds, abbreviations, ambiguity, flag pointers, "W;", optopt with opterr 0 and the exact stderr text. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> (cherry picked from commit a2740166d93920c301e1add23ceea762b4acad27)
15 lines
3.5 KiB
Markdown
15 lines
3.5 KiB
Markdown
# libSceLibcInternal technical debt
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### Unknown function info
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- [_sceLibcInternalThreadAtexit, _sceLibcInternalThreadDtors](../../../core/libs/prx/libSceLibcInternal/Export.cpp) (libSceLibcInternal) - FreeBSD `__cxa_thread_atexit` semantics assumed; a null or non-image destructor and an allocation failure throw
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- [_sceLibcInternalForceTlsDestructor](../../../core/libs/prx/libSceLibcInternal/Export.cpp) (libSceLibcInternal) - behaviour follows `sceLibcForceTlsDestructor(int)` in a title's `libc.prx` (disassembly): the calling thread's destructors whose dso belongs to the module run newest first, only if the dso's module is loaded and the dso points to itself, in up to 4 passes. The return type is unknown (that function returns nothing), 0 is returned. The module of each dso is looked up when the destructors are forced, not when they are registered as `libc.prx` does
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### Functional
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- [makecontext](../../../core/libs/prx/libSceLibcInternal/UserContext.cpp) (libSceLibcInternal) follows FreeBSD 11's `lib/libc/amd64/gen/makecontext.c`: at most six arguments, a stack of at least `MINSIGSTKSZ` (2048) bytes, and `exit(0)` when the function returns with no `uc_link`. The console's version is not verified
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- [makecontext](../../../core/libs/prx/libSceLibcInternal/UserContext.cpp) (libSceLibcInternal) on Windows pins its stack writable until a later `makecontext` stack overlaps it, since nothing tells the library when the guest frees the stack
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- [Thread exit destructors](../../../core/libs/prx/libSceLibcInternal/Export.cpp) (libSceLibcInternal) run when a libkernel thread finishes; on the main or a host thread only `_sceLibcInternalThreadDtors` runs them, as `exit` does, else they are dropped
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- [fstatvfs](../../../core/libs/prx/libSceLibcInternal/FilesystemStatistics.cpp) (libSceLibcInternal) converts `_fstatfs` to the 88-byte `struct statvfs` as FreeBSD 9.2's `sfs2svfs` does (`f_bsize` from the transfer size, `f_frsize` from the block size, `f_favail` equal to `f_ffree`, `f_fsid` 0, `ST_RDONLY` and `ST_NOSUID` only). Differences: `f_namemax` is the `statfs` value, not `fpathconf(_PC_NAME_MAX)`; negative `f_bavail` and `f_ffree` wrap to unsigned without `EOVERFLOW`, as the same-width copy in FreeBSD does; inode counts are 0 on Windows, inherited from `_fstatfs`; a null output returns `EFAULT` after the descriptor is validated, where FreeBSD would fault. Layout and conversion are unverified against the PS5 library (PS5MC imports `fstatvfs` but was not run)
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- [getopt, getopt_long](../../../core/libs/prx/libSceLibcInternal/Getopt.cpp) (libSceLibcInternal) follow FreeBSD 11 [getopt.c](https://github.com/freebsd/freebsd-src/blob/8c639945a44588f6cfdddfb057bb5aad88735da0/lib/libc/stdlib/getopt.c) and [getopt_long.c](https://github.com/freebsd/freebsd-src/blob/8c639945a44588f6cfdddfb057bb5aad88735da0/lib/libc/stdlib/getopt_long.c) with `GNU_COMPATIBLE`: `getopt` does not permute, `getopt_long` permutes unless `POSIXLY_CORRECT` is set in the guest environment or the option string starts with `+`, and the exported `opterr`, `optind`, `optopt`, `optreset` and `optarg` start at 1, 1, 0, 0 and null. Warnings go to the guest's current `stderr` prefixed with `__progname`, where FreeBSD's `warnx` keeps the `stderr` of its first call. A null `getopt` option string, a null argument vector or argument, a negative `optind` and an `optind` moved inside a pending permutation throw where FreeBSD faults. `getopt_long_only` is not exported. That the console's `libSceLibcInternal` uses this FreeBSD code is unverified
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