Add missing libc.prx symbols required by Unity IL2CPP runtime:
- Implement _Dtest double classification in Math.cpp
- Implement _Inf double constant in Math.cpp
- Implement sceLibcBacktraceGetBufferSize and sceLibcBacktraceSelf in Backtrace.cpp
- Implement _Cnd_signal in Threads.cpp
- Implement _ZNSt8ios_base7_AddstdEPS_ in RuntimeSupport.cpp
- Implement __pointer_type_info and __function_type_info vtables in TypeInfo.cpp
- Remove duplicate stubs from libSceAmpr/Export.cpp
- Add unit tests in GuestMath.cpp and GuestLibcThreads.cpp
- Document unverified behaviors in docs/dev/debt/libc.md
FreeBSD msun e_acosf.c returns (x-x)/(x-x) for |x| > 1 and NaN inputs: the
x86 default NaN 0xffc00000, or the quieted input NaN. std::acos left it to the
host libm, and guest_math failed on the runner's glibc 2.39.
Co-Authored-By: Claude <noreply@anthropic.com>
PPSA99611 imports ceilf, floorf, truncf, isnan and isinf from libc.prx and stops at start-up on main. Implement them next to the existing double forms: the rounding results delegate to the standard library like the other float exports, and isnan/isinf reuse the __isnan/__isinf helpers isnanf already uses.
The H+8UBOwfScI import was a throwing stub (libcCyberUnknown08). It is
the NID of "__powidf2", the double-precision integer-power helper that
complements __powisf2.
The previous commit replaced the out-of-range result with the default
quiet NaN 0x7fc00000, but main and FreeBSD e_acosf.c return 0xffc00000.
acosf now calls the host and restores errno, so only errno differs from
main. The guest test pins the result bits for 2.0f and -2.0f and keeps
the in-range case acosf(0.5f).
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
acosf returned 0xffc00000 (errno 33) for 2.0 (0x40000000), where FreeBSD
lib/msun/src/math.h returns 0xffc00000 (errno 0).
It now returns the FreeBSD result for that case. A guest test covers it
and fails on main.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Dusklight (PPSA99305) imports atanhf (cPGyc5FGjy0) from
libSceLibcInternal.prx; the libc.prx it bundles only has a zero-return
stub for it.
The implementation follows the atanhf of the libc.prx bundled with
PPSA28319 (0x438a0), read from its disassembly: FreeBSD msun's
e_atanhf.c calling msun's s_log1pf.c, both as of 59bc2f09 (stable/9,
the revision the sinhf port took expm1f and expf from). The log1pf
paths for the positive arguments atanhf passes are inlined, as the
exported log1pf is still the host's. For |x| > 1, the infinities and
NaN, Sony's error helper raises FE_INVALID and sets errno to EDOM
before returning (x - x) / (x - x); for |x| = 1 it sets errno to
ERANGE before returning x / 0. Other arguments leave errno alone.
Running that code from the title's libc.prx on a Windows host gives
the same bits, errno and floating-point exceptions as the built
libc.prx for all 2^32 arguments, and msun's own e_atanhf.c and
s_log1pf.c built with the host compiler give the same bits. With the
host log1pf instead of the msun one, 4.7% of the arguments in [0, 1)
differ. guest_math pins bits for every branch reachable from atanhf,
both signs, and the errno and exception behaviour.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
powf(1.0, nan) returned 0x7fc00001; FreeBSD msun (lib/msun/src/e_powf.c)
returns 0x3f800000. That case now follows FreeBSD; other inputs are
unchanged.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Kart PS5 (PPSA99611) stops on gacfOmO8hNs (ceil, per tools/nid_names.py)
from libc.prx once __umodti3 resolves (title run on #4519). ceil rounds
toward positive infinity whatever the rounding mode, keeps the sign of
zero and of results that round to zero, and returns infinities and NaNs
unchanged, as std::ceil does.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
OutRun2006 (PPSA99106) imports nearbyintl and stops at start-up on main. Add the long double round-to-nearest-integer export next to nearbyintf; std::nearbyint rounds under the current direction and raises no inexact exception.
RetroArch 1.0.0-beta.1 (PPSA99169) stops on main 0f863c10 at
FAIL: unresolved ELF import Nx-F5v0-qU8 from libSceLibcInternal.prx
Nx-F5v0-qU8 is asinl (tools/nid_names.py, aerolib).
The implementation follows the asinl of the libc.prx bundled with
PPSA28319, read from its disassembly: FreeBSD msun's e_asinl.c with
the ld80 invtrig.c coefficients (9f043204), which the binary holds as
the same 80-bit constants, computed in the x87 long double the guest
uses. +-1 returns +-pi/2 rounded to 64 bits and +-0 keeps its sign.
For |x| > 1, the infinities and NaN, Sony's error helper raises
FE_INVALID and sets errno to EDOM before returning (x - x) / (x - x),
so a NaN argument sets EDOM too.
20 million random arguments in (-1, 1) plus the branch edges give the
same bits as that code from the title's libc.prx run on a Windows
host. guest_math pins a set of those bits and checks the domain
errors' errno and FE_INVALID, and that errno is untouched otherwise.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Ruffle Flash 1.2.0 (PPSA68091) stops on main 0f863c10 at
FAIL: unresolved ELF import 1t1-JoZ0sZQ from libSceLibcInternal.prx
1t1-JoZ0sZQ is sinhf (tools/nid_names.py, aerolib). RetroArch
1.0.0-beta.1 (PPSA99169) imports it as well.
The implementation follows the sinhf of the libc.prx bundled with
PPSA28319, read from its disassembly: FreeBSD msun's e_sinhf.c as of
5aa554c7 (before __ldexp_expf, so expf(|x| / 2) is squared between
logf(FLT_MAX) and the overflow threshold), calling msun stable/9
expm1f and expf (59bc2f09), whose paths for the arguments sinhf passes
are inlined. Past the threshold Sony's error helper sets errno to
ERANGE before returning x * 1e37; NaN and the infinities return x + x
and leave errno alone.
Running that code from the title's libc.prx on a Windows host gives
the same bits as this implementation for every finite argument up to
the threshold, both signs (2,238,032,378 inputs). guest_math pins a
set of those bits, the overflow errno and FE_OVERFLOW, and checks that
errno is untouched otherwise.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
exp2 set errno (34) for 1024.0. FreeBSD msun never sets errno and
reports errors through floating-point exceptions only, so errno is now
saved and restored around the host call.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
On main asin(2.0) returns 0x7ff8000000000000 and sets errno to 33;
FreeBSD msun (lib/msun/src/e_asin.c) returns 0xfff8000000000000 and
never sets errno. asin now handles |x| > 1 itself with quiet
comparisons, so a NaN input still raises no exception. For |x| <= 1
and for NaN the host function is still called.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
asinf returned 0xffc00000 (errno 33) for 2.0 (0x40000000), where FreeBSD
lib/msun/src/math.h returns 0xffc00000 (errno 0).
It now returns the FreeBSD result for that case. A guest test covers it
and fails on main.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
fmod set errno (33) for 1.0, 0.0. FreeBSD msun never sets errno and
reports errors through floating-point exceptions only, so errno is now
saved and restored around the host call.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
hypot(inf, NaN) returned a NaN on main. C Annex F returns +inf when
either operand is infinite, even if the other is a NaN, and FreeBSD
msun (lib/msun/src/e_hypot.c) does so for a signalling NaN too. The
infinite case is now checked before std::hypot; other inputs do not
change.
Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Add standard quiet NaN generators nanf (DZU+K1wozGI) and nan (zck+6bVj5pA) to libc.
Resolves startup failure in VLC for PS5 (PPSA85300) where execution halts at nanf on Linux once strsep is available.
The original fix predates llroundf, which was added in #2933. Use the same guest range and exception behavior for the fourth wrapper and include it in the edge-case checks.
FreeBSD amd64 converts the rounded value with a plain cast, so NaN, infinities and values outside the 64-bit range give 0x8000000000000000 with FE_INVALID raised. The Windows host llround returns 0 for them.
(cherry picked from commit 0ee2741534bdfcc9d818b1d93f2eb793a68f111e)
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