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From: Dimitry Andric In-Reply-To: Date: Mon, 26 May 2025 15:15:27 +0200 Cc: "current@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <0r5n4p87-3pn0-3247-8n6q-n20qn0ro27r9@yvfgf.mnoonqbm.arg> <74650476-D42E-4074-A18F-D7F474EC271B@FreeBSD.org> To: "Bjoern A. Zeeb" X-Mailer: Apple Mail (2.3731.700.6.1.11) On 26 May 2025, at 15:05, Bjoern A. Zeeb = wrote: >=20 > On Mon, 26 May 2025, Dimitry Andric wrote: >=20 > Hi, >=20 > thanks for the quick answer. >=20 >> On 26 May 2025, at 14:25, Bjoern A. Zeeb = wrote: >>>=20 >>> I've just compiled and installed a new arm64/main with my own kernel >>> config to have wifi bits as modules. >>>=20 >>> I am a bit puzzed as to where this comes from in the kernel. >>>=20 >>> # kldload wlan >>> link_elf: symbol __floatundidf undefined: 0xffff000143ed1370 = 0xffff000143ecf9f0 11496 0xffff000143ed26d8 0x2 >>> kldload: can't load wlan: No such file or directory >>>=20 >>> % nm modules/usr/src/sys/modules/wlan/wlan.ko.full | grep float >>> U __floatundidf >>>=20 >>> Anyone any idea? >>=20 >> _Something_ is converting a unsigned long to a double, but what? Can = you figure out which object file it is? >=20 > % nm ieee80211_ioctl.o | grep __floatundidf > U __floatundidf >=20 > This may be a local change I have adding an extra 10% of space in the > ioctl code to accomodate for enlargement of a result set for testing. > size_t space; > ... > space *=3D 1.10; >=20 > Given it's likely that it's that I think the real question is, why is = this > not an issue on amd64 but on arm64 as I've been running that change = for > days on amd64? My guess is that it's inlined on amd64. For me simple cases also inline = on arm64, but maybe you are doing something more complicated: $ cat convert.c #include size_t f(size_t s) { return s * 1.10; } $ cc -target aarch64-freebsd -S convert.c -o - .text .file "convert.c" .section .rodata.cst8,"aM",@progbits,8 .p2align 3, 0x0 // -- Begin = function f .LCPI0_0: .xword 0x3ff199999999999a // double = 1.1000000000000001 .text .globl f .p2align 2 .type f,@function f: // @f .cfi_startproc // %bb.0: // %entry sub sp, sp, #16 .cfi_def_cfa_offset 16 str x0, [sp, #8] ldr d0, [sp, #8] ucvtf d0, d0 adrp x8, .LCPI0_0 ldr d1, [x8, :lo12:.LCPI0_0] fmul d0, d0, d1 fcvtzu x0, d0 add sp, sp, #16 .cfi_def_cfa_offset 0 ret .Lfunc_end0: .size f, .Lfunc_end0-f .cfi_endproc // -- End function .ident "FreeBSD clang version 19.1.7 = (https://github.com/llvm/llvm-project.git = llvmorg-19.1.7-0-gcd708029e0b2)" .section ".note.GNU-stack","",@progbits .addrsig -Dimitry