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uclibc-ng static libm.a support
by servo gmrt 09 Oct '18

09 Oct '18

Hi, I am using buildroot for my development work. I build a minimal linux for ICOP VDX6354 board. I am using rtai-4.1 for hard realtime task for my application. I need to link the static libm to rtai_math.ko module to use math function support in rtai. When I use buildroot with uclibc I am able to generate libm.a. But when I try to disassabmle the libm.a it lists lot of unknown symbols. Also when I try to insert the rtai_math.ko it also reports the unknown symbols. Is there any way to build the uclibc static libm.a with all symbols included in it. Buildroot Version : 2018.02.5 with rtai-4.1 Pl. comment. *Kernel Error MessagesOct 9 07:50:59 buildroot kern.info <http://kern.info> kernel: [ 150.912353] I-pipe: head domain RTAI registered.Oct 9 07:50:59 buildroot kern.info <http://kern.info> kernel: [ 150.912644] RTAI[hal]: mounted. ISOL_CPUS_MASK: 0.Oct 9 07:50:59 buildroot kern.warn kernel: [ 150.912988] SYSINFO - # CPUs: 1, TIMER NAME: 'lapic', TIMER IRQ: 2306, TIMER FREQ: 62425609, CLOCK NAME: 'tsc', CLOCK FREQ: 2992451000, CPU FREQ: 2992451000, LINUX TIMER IRQ: 2306.Oct 9 07:50:59 buildroot kern.warn kernel: [ 150.913750] Oct 9 07:50:59 buildroot kern.warn kernel: [ 150.913750] REMARK: RTAI WILL NOT ACCESS USER SPACE ON STACKS ARGS ITS WAY.Oct 9 07:50:59 buildroot kern.warn kernel: [ 150.913750] Oct 9 07:51:03 buildroot kern.info <http://kern.info> kernel: [ 154.037668] RTAI[malloc]: global heap size = 2097152 bytes, <BSD>.Oct 9 07:51:03 buildroot kern.warn kernel: [ 154.043926] , kstacks pool size = 524288 bytesOct 9 07:51:03 buildroot kern.warn kernel: [ 154.044298] .Oct 9 07:51:03 buildroot kern.info <http://kern.info> kernel: [ 154.044673] RTAI[sched]: hard timer type/freq = lapic/62425609(Hz); timing: ONESHOT; Oct 9 07:51:03 buildroot kern.warn kernel: [ 154.045091] linear timed lists.Oct 9 07:51:03 buildroot kern.info <http://kern.info> kernel: [ 154.045471] RTAI[sched]: Linux timer freq = 1000 (Hz), TimeBase freq = 2992451000 hz.Oct 9 07:51:03 buildroot kern.info <http://kern.info> kernel: [ 154.045846] RTAI[sched]: timer setup = 2569 ns, resched latency = 0 ns.Oct 9 07:51:03 buildroot kern.info <http://kern.info> kernel: [ 154.047169] RTAI[usi]: enabled.Oct 9 07:51:03 buildroot kern.warn kernel: [ 154.067972] USERMODE CHECK: OK.Oct 9 07:51:03 buildroot kern.warn kernel: [ 154.068754] USERMODE CHECK PROVIDED (ns): KernelLatency -1, UserLatency -1.Oct 9 07:51:04 buildroot kern.warn kernel: [ 155.044665] KERNEL SPACE LATENCY ENDED AT CYCLE: 9706, LATENCY = 499704, VARIANCE = 2743/10004569, GAIN = 68563/1000000000, LEAST = 9828.Oct 9 07:51:04 buildroot kern.warn kernel: [ 155.144175] AFTER KERNEL CALIBRATION (WITH RTAI TASK, ns): KernelLatency 166989, UserLatency -1 (CALIBRATION: PERIOD 10000 (ns), TIME 1074635480 (ns)).Oct 9 07:51:05 buildroot kern.warn kernel: [ 156.153787] USER SPACE LATENCY ENDED AT CYCLE: 10000, LATENCY = 208549, VARIANCE = 0.000632709, GAIN = 0.000158177, LEAST = 28692.Oct 9 07:51:05 buildroot kern.warn kernel: [ 156.156272] USERMODE USER SPACE CALIBRATION: OK.Oct 9 07:51:05 buildroot kern.warn kernel: [ 156.156942] AFTER USER CALIBRATION (ns): KernelLatency 166989, UserLatency 69691 (CALIBRATION: PERIOD 10000 (ns), TIME 1011276710 (ns)).Oct 9 07:51:05 buildroot kern.warn kernel: [ 156.158248] FINAL CALIBRATION SUMMARY (ns): KernelLatency 166989, UserLatency 69691.Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.457001] rtai_math: Unknown symbol expm1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.457699] rtai_math: Unknown symbol fmodf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.458650] rtai_math: Unknown symbol fabs (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.461533] rtai_math: Unknown symbol log (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.461533] rtai_math: Unknown symbol sqrt (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.461787] rtai_math: Unknown symbol cosh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.462702] rtai_math: Unknown symbol asinh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.463434] rtai_math: Unknown symbol lroundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.464418] rtai_math: Unknown symbol exp2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.465166] rtai_math: Unknown symbol ldexpf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.465803] rtai_math: Unknown symbol tgammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.466709] rtai_math: Unknown symbol logb (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.467461] rtai_math: Unknown symbol round (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.468338] rtai_math: Unknown symbol atanhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.468979] rtai_math: Unknown symbol remquof (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.470590] rtai_math: Unknown symbol nextafterf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.471333] rtai_math: Unknown symbol powf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.472320] rtai_math: Unknown symbol lround (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.472948] rtai_math: Unknown symbol modff (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.473841] rtai_math: Unknown symbol tanhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.474584] rtai_math: Unknown symbol ceil (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.475467] rtai_math: Unknown symbol logf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.476193] rtai_math: Unknown symbol floor (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.476843] rtai_math: Unknown symbol j1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.477733] rtai_math: Unknown symbol sqrtf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.478471] rtai_math: Unknown symbol y0 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.479455] rtai_math: Unknown symbol fdimf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.480185] rtai_math: Unknown symbol lgamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.480830] rtai_math: Unknown symbol roundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.481824] rtai_math: Unknown symbol truncf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.482571] rtai_math: Unknown symbol ldexp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.483448] rtai_math: Unknown symbol yn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.484224] rtai_math: Unknown symbol __fpclassifyf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.484867] rtai_math: Unknown symbol erf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.485781] rtai_math: Unknown symbol scalbln (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.486522] rtai_math: Unknown symbol fabsf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.487402] rtai_math: Unknown symbol gamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.488203] rtai_math: Unknown symbol acoshf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.488831] rtai_math: Unknown symbol llrint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.489733] rtai_math: Unknown symbol nearbyint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.491002] rtai_math: Unknown symbol remainderf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.491998] rtai_math: Unknown symbol cosf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.492795] rtai_math: Unknown symbol __signbit (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.493713] rtai_math: Unknown symbol rint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.494432] rtai_math: Unknown symbol lgammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.495317] rtai_math: Unknown symbol lrintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.495943] rtai_math: Unknown symbol lrint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.496833] rtai_math: Unknown symbol hypotf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.497586] rtai_math: Unknown symbol __fpclassify (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.498528] rtai_math: Unknown symbol j1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.499267] rtai_math: Unknown symbol asinhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.499887] rtai_math: Unknown symbol log10f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.500794] rtai_math: Unknown symbol modf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.501613] rtai_math: Unknown symbol y1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.502522] rtai_math: Unknown symbol fmod (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.503340] rtai_math: Unknown symbol cos (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.503949] rtai_math: Unknown symbol tanh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.504837] rtai_math: Unknown symbol exp2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.505562] rtai_math: Unknown symbol tgamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.506460] rtai_math: Unknown symbol coshf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.507244] rtai_math: Unknown symbol sin (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.507845] rtai_math: Unknown symbol fma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.508794] rtai_math: Unknown symbol atan2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.509538] rtai_math: Unknown symbol gammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.511287] rtai_math: Unknown symbol pow (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.511904] rtai_math: Unknown symbol sinh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.512786] rtai_math: Unknown symbol cbrtf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.513597] rtai_math: Unknown symbol atanh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.514476] rtai_math: Unknown symbol log10 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.515214] rtai_math: Unknown symbol fdim (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.515826] rtai_math: Unknown symbol cbrt (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.516719] rtai_math: Unknown symbol log2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.517470] rtai_math: Unknown symbol lgamma_r (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.518477] rtai_math: Unknown symbol erff (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.519235] rtai_math: Unknown symbol scalbnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.519868] rtai_math: Unknown symbol llroundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.529870] rtai_math: Unknown symbol fmaxf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.531363] rtai_math: Unknown symbol ilogbf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.532282] rtai_math: Unknown symbol jnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.532915] rtai_math: Unknown symbol matherr (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.533966] rtai_math: Unknown symbol jn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.534734] rtai_math: Unknown symbol nextafter (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.535689] rtai_math: Unknown symbol exp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.536430] rtai_math: Unknown symbol lgammaf_r (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.537349] rtai_math: Unknown symbol tan (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.538178] rtai_math: Unknown symbol copysign (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.538814] rtai_math: Unknown symbol acosf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.539733] rtai_math: Unknown symbol copysignf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.540501] rtai_math: Unknown symbol atan (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.541495] rtai_math: Unknown symbol remainder (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.542282] rtai_math: Unknown symbol asin (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.542919] rtai_math: Unknown symbol scalbn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.543844] rtai_math: Unknown symbol atan2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.544598] rtai_math: Unknown symbol log1pf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.545509] rtai_math: Unknown symbol y0f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.546300] rtai_math: Unknown symbol j0 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.546940] rtai_math: Unknown symbol acosh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.547881] rtai_math: Unknown symbol sinf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.548598] rtai_math: Unknown symbol scalblnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.549558] rtai_math: Unknown symbol ceilf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.551154] rtai_math: Unknown symbol tanf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.551812] rtai_math: Unknown symbol fmaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.552720] rtai_math: Unknown symbol fmax (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.553485] rtai_math: Unknown symbol ilogb (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.554401] rtai_math: Unknown symbol llround (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.555218] rtai_math: Unknown symbol log2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.555879] rtai_math: Unknown symbol frexpf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.557555] rtai_math: Unknown symbol atanf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.558279] rtai_math: Unknown symbol log1p (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.558933] rtai_math: Unknown symbol __signbitf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.559885] rtai_math: Unknown symbol expf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.560715] rtai_math: Unknown symbol rintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.561724] rtai_math: Unknown symbol llrintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.562482] rtai_math: Unknown symbol j0f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.563377] rtai_math: Unknown symbol sinhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.564159] rtai_math: Unknown symbol floorf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.564830] rtai_math: Unknown symbol nearbyintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.565751] rtai_math: Unknown symbol asinf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.566533] rtai_math: Unknown symbol acos (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.567518] rtai_math: Unknown symbol hypot (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.568258] rtai_math: Unknown symbol trunc (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.568908] rtai_math: Unknown symbol expm1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.569833] rtai_math: Unknown symbol y1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.571212] rtai_math: Unknown symbol logbf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.571951] rtai_math: Unknown symbol frexp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.572892] rtai_math: Unknown symbol erfc (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.573705] rtai_math: Unknown symbol ynf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.574637] rtai_math: Unknown symbol erfcf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.575411] rtai_math: Unknown symbol remquo (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.580006] rtai_math: Unknown symbol expm1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.580803] rtai_math: Unknown symbol fmodf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.581829] rtai_math: Unknown symbol fabs (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.582602] rtai_math: Unknown symbol log (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.583539] rtai_math: Unknown symbol sqrt (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.584288] rtai_math: Unknown symbol cosh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.584962] rtai_math: Unknown symbol asinh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.585908] rtai_math: Unknown symbol lroundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.586671] rtai_math: Unknown symbol exp2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.587667] rtai_math: Unknown symbol ldexpf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.588432] rtai_math: Unknown symbol tgammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.589367] rtai_math: Unknown symbol logb (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.590125] rtai_math: Unknown symbol round (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.590795] rtai_math: Unknown symbol atanhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.592397] rtai_math: Unknown symbol remquof (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.593182] rtai_math: Unknown symbol nextafterf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.593848] rtai_math: Unknown symbol powf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.594855] rtai_math: Unknown symbol lround (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.595657] rtai_math: Unknown symbol modff (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.596586] rtai_math: Unknown symbol tanhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.597342] rtai_math: Unknown symbol ceil (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.597992] rtai_math: Unknown symbol logf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.598942] rtai_math: Unknown symbol floor (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.599727] rtai_math: Unknown symbol j1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.600707] rtai_math: Unknown symbol sqrtf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.601543] rtai_math: Unknown symbol y0 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.602440] rtai_math: Unknown symbol fdimf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.603201] rtai_math: Unknown symbol lgamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.603848] rtai_math: Unknown symbol roundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.604775] rtai_math: Unknown symbol truncf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.605582] rtai_math: Unknown symbol ldexp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.606566] rtai_math: Unknown symbol yn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.607331] rtai_math: Unknown symbol __fpclassifyf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.607998] rtai_math: Unknown symbol erf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.608918] rtai_math: Unknown symbol scalbln (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.609677] rtai_math: Unknown symbol fabsf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.611331] rtai_math: Unknown symbol gamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.611980] rtai_math: Unknown symbol acoshf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.612995] rtai_math: Unknown symbol llrint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.613773] rtai_math: Unknown symbol nearbyint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.614716] rtai_math: Unknown symbol remainderf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.615477] rtai_math: Unknown symbol cosf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.616380] rtai_math: Unknown symbol __signbit (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.617180] rtai_math: Unknown symbol rint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.617812] rtai_math: Unknown symbol lgammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.618750] rtai_math: Unknown symbol lrintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.619525] rtai_math: Unknown symbol lrint (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.620515] rtai_math: Unknown symbol hypotf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.621361] rtai_math: Unknown symbol __fpclassify (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.622299] rtai_math: Unknown symbol j1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.622948] rtai_math: Unknown symbol asinhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.623907] rtai_math: Unknown symbol log10f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.624699] rtai_math: Unknown symbol modf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.625607] rtai_math: Unknown symbol y1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.626364] rtai_math: Unknown symbol fmod (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.627280] rtai_math: Unknown symbol cos (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.627942] rtai_math: Unknown symbol tanh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.628880] rtai_math: Unknown symbol exp2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.629661] rtai_math: Unknown symbol tgamma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.631333] rtai_math: Unknown symbol coshf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.632001] rtai_math: Unknown symbol sin (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.632947] rtai_math: Unknown symbol fma (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.633710] rtai_math: Unknown symbol atan2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.634674] rtai_math: Unknown symbol gammaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.636002] rtai_math: Unknown symbol pow (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.638171] rtai_math: Unknown symbol sinh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.638836] rtai_math: Unknown symbol cbrtf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.639765] rtai_math: Unknown symbol atanh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.640527] rtai_math: Unknown symbol log10 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.641527] rtai_math: Unknown symbol fdim (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.642257] rtai_math: Unknown symbol cbrt (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.642908] rtai_math: Unknown symbol log2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.643841] rtai_math: Unknown symbol lgamma_r (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.644588] rtai_math: Unknown symbol erff (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.645533] rtai_math: Unknown symbol scalbnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.646329] rtai_math: Unknown symbol llroundf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.646985] rtai_math: Unknown symbol fmaxf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.647933] rtai_math: Unknown symbol ilogbf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.648690] rtai_math: Unknown symbol jnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.649577] rtai_math: Unknown symbol matherr (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.650391] rtai_math: Unknown symbol jn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.652002] rtai_math: Unknown symbol nextafter (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.652769] rtai_math: Unknown symbol exp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.653699] rtai_math: Unknown symbol lgammaf_r (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.654457] rtai_math: Unknown symbol tan (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.655374] rtai_math: Unknown symbol copysign (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.656131] rtai_math: Unknown symbol acosf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.656793] rtai_math: Unknown symbol copysignf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.657729] rtai_math: Unknown symbol atan (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.658483] rtai_math: Unknown symbol remainder (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.659449] rtai_math: Unknown symbol asin (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.660214] rtai_math: Unknown symbol scalbn (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.660861] rtai_math: Unknown symbol atan2f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.661852] rtai_math: Unknown symbol log1pf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.662614] rtai_math: Unknown symbol y0f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.663514] rtai_math: Unknown symbol j0 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.664320] rtai_math: Unknown symbol acosh (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.664954] rtai_math: Unknown symbol sinf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.665884] rtai_math: Unknown symbol scalblnf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.666639] rtai_math: Unknown symbol ceilf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.667554] rtai_math: Unknown symbol tanf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.668348] rtai_math: Unknown symbol fmaf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.669001] rtai_math: Unknown symbol fmax (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.669941] rtai_math: Unknown symbol ilogb (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.670714] rtai_math: Unknown symbol llround (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.672314] rtai_math: Unknown symbol log2 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.672955] rtai_math: Unknown symbol frexpf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.673940] rtai_math: Unknown symbol atanf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.674717] rtai_math: Unknown symbol log1p (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.675632] rtai_math: Unknown symbol __signbitf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.676397] rtai_math: Unknown symbol expf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.677328] rtai_math: Unknown symbol rintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.677979] rtai_math: Unknown symbol llrintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.678896] rtai_math: Unknown symbol j0f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.679665] rtai_math: Unknown symbol sinhf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.680614] rtai_math: Unknown symbol floorf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.681462] rtai_math: Unknown symbol nearbyintf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.682388] rtai_math: Unknown symbol asinf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.683173] rtai_math: Unknown symbol acos (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.683806] rtai_math: Unknown symbol hypot (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.684704] rtai_math: Unknown symbol trunc (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.685471] rtai_math: Unknown symbol expm1f (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.686434] rtai_math: Unknown symbol y1 (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.687959] rtai_math: Unknown symbol logbf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.688874] rtai_math: Unknown symbol frexp (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.689633] rtai_math: Unknown symbol erfc (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.690551] rtai_math: Unknown symbol ynf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.701296] rtai_math: Unknown symbol erfcf (err 0)Oct 9 07:51:11 buildroot kern.warn kernel: [ 162.702155] rtai_math: Unknown symbol remquo (err 0)* Regards B.Thiyagarajan

1 0

recvmmsg/sendmmsg not in kernel < Linux 2.6.33
by Lance Fredrickson 09 Oct '18

09 Oct '18

Hi, I'm having an issue where it seems recvmmsg/sendmmsg is being included into the c library regardless of kernel version. I work with kernel versions < 2.6.33 before this feature was included. When compiling applications, autoconf is then mistakenly told from the c-library that recvmmsg/sendmmsg is supported by the kernel, resulting in runtime errors. I use buildroot to compile my toolchains. Looking through uclibc-ng git, it looks like this feature was added with this commit. https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=6e15fafa200666… thanks, Lance Fredrickson

2 3

Re: [uclibc-ng-devel] devel Digest, Vol 52, Issue 2
by Guo Ren 08 Oct '18

08 Oct '18

Hello, On Sat, Oct 06, 2018 at 12:00:02PM +0200, devel-request(a)uclibc-ng.org wrote: > Message: 1 > Date: Fri, 5 Oct 2018 07:48:40 -0600 > From: Lance Fredrickson <lancethepants(a)gmail.com> > To: devel(a)uclibc-ng.org > Subject: [uclibc-ng-devel] Fwd: recvmmsg/sendmmsg not in kernel < > Linux 2.6.33 > Message-ID: <fc65bbd1-8cfa-f4cb-9a5b-25e21a273494(a)gmail.com> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > Hi, > > I'm having an issue where it seems recvmmsg/sendmmsg is being included > into the c library regardless of kernel version. I work with kernel > versions < 2.6.33 before this feature was included. When compiling > applications, autoconf is then mistakenly told from the c-library that > recvmmsg/sendmmsg is supported by the kernel, resulting in runtime > errors. I use buildroot to compile my toolchains. > > Looking through uclibc-ng git, it looks like this feature was added with > this commit. > https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=6e15fafa200666… +# ifdef __NR_recvmmsg ^^^^^^^^^^^^^ + return (ssize_t)INLINE_SYSCALL(recvmmsg, 5, sockfd, msg, vlen, flags, tmo); +# else ...... + return (ssize_t)__socketcall(SYS_RECVMMSG, args); +# endif +} You kernel define __NR_recvmmsg in unistd.h ? Best Regards Guo Ren

2 1

recvmmsg/sendmmsg not in kernel < Linux 2.6.33
by Lance Fredrickson 27 Sep '18

27 Sep '18

1 0

recvmmsg/sendmmsg not in kernel < Linux 2.6.33
by Lance Fredrickson 24 Sep '18

24 Sep '18

1 0

[PATCH] bugfix renameat2 wrong implement.
by Guo Ren 13 Sep '18

13 Sep '18

Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/rename.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libc/sysdeps/linux/common/rename.c b/libc/sysdeps/linux/common/rename.c index 30a4ed7..613ae4e 100644 --- a/libc/sysdeps/linux/common/rename.c +++ b/libc/sysdeps/linux/common/rename.c @@ -20,7 +20,9 @@ int rename(const char *oldpath, const char *newpath) # include <fcntl.h> int rename(const char *oldpath, const char *newpath) { - _syscall2(int, renameat2, const char *, oldpath, const char *, newpath) + _syscall5(int, renameat2, int, olddfd, const char *, oldpath, + int, newdfd, const char *, newpath, int, flags) + return renameat2(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0); } #else _syscall2(int, rename, const char *, oldpath, const char *, newpath) -- 2.7.4

1 0

[PATCH] wordexp: Fix the usage of the internal _itoa function
by Segev Finer 08 Sep '18

08 Sep '18

The original from glibc received the end of the buffer and worked backwards. Ours needs the beginning of the buffer. Signed-off-by: Segev Finer <segev208(a)gmail.com> --- libc/misc/wordexp/wordexp.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/libc/misc/wordexp/wordexp.c b/libc/misc/wordexp/wordexp.c index fb635fe91..285e81e87 100644 --- a/libc/misc/wordexp/wordexp.c +++ b/libc/misc/wordexp/wordexp.c @@ -491,10 +491,10 @@ parse_squote(char **word, size_t * word_length, size_t * max_length, #ifdef __WORDEXP_FULL static int eval_expr(char *expr, long int *result); -static char *_itoa(unsigned long long int value, char *buflim) +static char *_itoa(unsigned long long int value, char *buf) { - sprintf(buflim, "%llu", value); - return buflim; + sprintf(buf, "%llu", value); + return buf; } /* Functions to evaluate an arithmetic expression */ @@ -692,7 +692,7 @@ parse_arith(char **word, size_t * word_length, size_t * max_length, result[20] = '\0'; *word = w_addstr(*word, word_length, max_length, - _itoa(convertme, &result[20])); + _itoa(convertme, result)); free(expr); return *word ? 0 : WRDE_NOSPACE; } @@ -717,7 +717,7 @@ parse_arith(char **word, size_t * word_length, size_t * max_length, result[20] = '\0'; *word = w_addstr(*word, word_length, max_length, - _itoa(numresult, &result[20])); + _itoa(numresult, result)); free(expr); return *word ? 0 : WRDE_NOSPACE; } @@ -1313,7 +1313,7 @@ parse_param(char **word, size_t * word_length, size_t * max_length, if (seen_hash) { /* $# expands to the number of positional parameters */ buffer[20] = '\0'; - value = _itoa(__libc_argc - 1, &buffer[20]); + value = _itoa(__libc_argc - 1, buffer); seen_hash = 0; } else { /* Just $ on its own */ @@ -1338,13 +1338,13 @@ parse_param(char **word, size_t * word_length, size_t * max_length, /* Is it `$$'? */ if (*env == '$') { buffer[20] = '\0'; - value = _itoa(getpid(), &buffer[20]); + value = _itoa(getpid(), buffer); } /* Is it `${#*}' or `${#@}'? */ else if ((*env == '*' || *env == '@') && seen_hash) { buffer[20] = '\0'; value = _itoa(__libc_argc > 0 ? __libc_argc - 1 : 0, - &buffer[20]); + buffer); *word = w_addstr(*word, word_length, max_length, value); free(env); free(pattern); @@ -1770,7 +1770,7 @@ parse_param(char **word, size_t * word_length, size_t * max_length, param_length[20] = '\0'; *word = w_addstr(*word, word_length, max_length, _itoa(value ? strlen(value) : 0, - &param_length[20])); + param_length)); if (free_value) { assert(value != NULL); free(value); -- 2.18.0

2 1

[PATCH] Fix path to file libtest31.so
by Nikita Sobolev 16 Aug '18

16 Aug '18

From: Nikita Sobolev <sobolev(a)synopsys.com> Test failed with error 'Could not open libtest31.so: File not found'. dlopen function is trying to find libtest31.so in the same directory where the test is run. But libtest31.so is lockated in testlib directory. So fix changes the path to library. Signed-off-by: Nikita Sobolev <Nikita.Sobolev(a)synopsys.com> --- test/dlopen/tst-origin.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/test/dlopen/tst-origin.c b/test/dlopen/tst-origin.c index 60fcd3f..e456f1e 100644 --- a/test/dlopen/tst-origin.c +++ b/test/dlopen/tst-origin.c @@ -12,13 +12,13 @@ int main(int argc, char **argv) { int __attribute__((unused))(*mydltest)(const char *s); char *error; - h1 = dlopen ("libtest31.so", RTLD_LAZY); + h1 = dlopen ("testlib/libtest31.so", RTLD_LAZY); if (!h1) { fprintf(stderr, "Could not open libtest31.so: %s\n", dlerror()); exit(1); } - h2 = dlopen ("libtest31.so", RTLD_NOLOAD); + h2 = dlopen ("testlib/libtest31.so", RTLD_NOLOAD); if (!h2) { fprintf(stderr, "Could not open libtest31.so(RTLD_NOLOAD): %s\n", dlerror()); exit(1); -- 2.16.2

2 1

[PATCH] sched_setaffinity: use the same style with glibc's
by Guo Ren 16 Aug '18

16 Aug '18

Call getpid() in INTERNAL_SYSCALL will break the argument regs, because gcc couldn't save destoryed regs for system call asm. Ref to glibc, we could just remove all the check code. Signed-off-by: Guo Ren <ren_guo(a)c-sky.com> --- libc/sysdeps/linux/common/sched_setaffinity.c | 34 --------------------------- 1 file changed, 34 deletions(-) diff --git a/libc/sysdeps/linux/common/sched_setaffinity.c b/libc/sysdeps/linux/common/sched_setaffinity.c index 3d513ef..39f6ec8 100644 --- a/libc/sysdeps/linux/common/sched_setaffinity.c +++ b/libc/sysdeps/linux/common/sched_setaffinity.c @@ -27,42 +27,8 @@ static __always_inline _syscall3(int, __syscall_sched_setaffinity, __kernel_pid_t, pid, size_t, cpusetsize, const cpu_set_t *, cpuset) -static size_t __kernel_cpumask_size; - int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset) { - size_t cnt; - int res; - size_t psize = 128; - void *p = alloca (psize); - - if (unlikely (__kernel_cpumask_size == 0)) { - - INTERNAL_SYSCALL_DECL (err); - while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (), - psize, p), - INTERNAL_SYSCALL_ERROR_P (res, err) - && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) - p = extend_alloca (p, psize, 2 * psize); - - if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) { - __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); - return -1; - } - - __kernel_cpumask_size = res; - } - - /* We now know the size of the kernel cpumask_t. Make sure the user - does not request to set a bit beyond that. */ - for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt) - if (((char *) cpuset)[cnt] != '\0') { - /* Found a nonzero byte. This means the user request cannot be - fulfilled. */ - __set_errno (EINVAL); - return -1; - } - return __syscall_sched_setaffinity(pid, cpusetsize, cpuset); } #endif -- 2.7.4

2 1

[PATCH 00/32] FDPIC ABI for ARM
by Christophe Lyon 10 Aug '18

10 Aug '18

Hello, This patch series implements the uClibc-ng contribution of the FDPIC ABI for ARM targets. This ABI enables to run Linux on ARM MMU-less cores and supports shared libraries to reduce the memory footprint. Without MMU, text and data segments relative distances are different from one process to another, hence the need for a dedicated FDPIC register holding the start address of the data segment. One of the side effects is that function pointers require two words to be represented: the address of the code, and the data segment start address. These two words are designated as "Function Descriptor", hence the "FD PIC" name. On ARM, the FDPIC register is r9 [1], and the target name is arm-uclinuxfdpiceabi. Note that arm-uclinux exists, but uses another ABI and the BFLAT file format; it does not support code sharing. This work was developed some time ago by STMicroelectronics, and was presented during Linaro Connect SFO15 (September 2015). You can watch the discussion and read the slides [2]. This presentation was related to the toolchain published on github [3], which is based on binutils-2.22, gcc-4.7, uclibc-0.9.33.2, gdb-7.5.1 and qemu-2.3.0, and for which pre-built binaries are available [3]. The ABI itself is described in details in [1]. Our Linux kernel patches have been updated and committed by Nicolas Pitre (Linaro) in July 2017. They are required so that the loader is able to handle this new file type. Indeed, the ELF files are tagged with ELFOSABI_ARM_FDPIC. This new tag has been allocated by ARM, as well as the new relocations involved. The binutils and QEMU patch series have been merged recently. [4][5] The GCC patch series has been submitted and is under discussion. [6] This patch series consists in the original uClibc-based patches, which I have rebased and updated for uClibc-ng. Most of them are strictly related to FDPIC on ARM, while a few others address generic issues. Are the uClibc-ng patches OK for inclusion in master? Thanks, Christophe. [1] https://github.com/mickael-guene/fdpic_doc/blob/master/abi.txt [2] http://connect.linaro.org/resource/sfo15/sfo15-406-arm-fdpic-toolset-kernel… [3] https://github.com/mickael-guene/fdpic_manifest [4] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=f1ac0af… [5] https://git.qemu.org/?p=qemu.git;a=commit;h=e8fa72957419c11984608062c7dcb20… [6] https://gcc.gnu.org/ml/gcc-patches/2018-05/msg01439.html Christophe Lyon (32): [ARM][FDPIC] Allow to select FDPIC ELF for arm architecture [FDPIC] rtld: Do not protect RELRO segments when we don't use an MMU. [ARM][FDPIC] rtld: Add #if defined (__FDPIC__) [ARM][FDPIC] rtld: Add FDPIC code for arm [ARM][FDPIC] rtld: Avoid FUNCDESC relocation on _start [ARM][FDPIC] rtld: Add startup code [ARM] Fix bug in _dl_pread when using pread64 syscall [ARM][FDPIC] Add application startup code for FDPIC [ARM][FDPIC] Add runtime support needed for C++ exceptions [ARM][FDPIC] Allow to generate PIE 'static' binary [ARM][FDPIC] rtld: Add lazy binding support [ARM][FDPIC] TLS: fix relocation computation [ARM][FDPIC] rtld: Compile with -fno-unwind-tables -fno-asynchronous-unwind-tables [ARM][FDPIC] arm/clone.S: Fix threading support [ARM][FDPIC] enable NPTL on TARGET_arm [ARM][FDPIC] rtld: Use ELF_RTYPE_CLASS_DLSYM [FDPIC] rtld: Initialize _dl_error_catch_tsd without FUNCDESC relocation [FDPIC] nptl: disable mprotect usage in stack protection [FDPIC] nptl: Disable fork and atfork on MMU-less systems. [FDPIC] nptl: Do not use madvise [ARM][FDPIC] nptl: Use linker-defined symbol to find start of .tdata section. [FDPIC] nptl: Allow sem_open to work on MMU-less systems [FDPIC] nptl: Add pthread_mutex_getprioceiling and pthread_mutex_setprioceiling support [FDPIC] nptl: Use vfork on MMU-less for system() nptl: Clear TLS area for static binaries. [FDPIC] nptl: Replace sbrk with mmap nptl threads: Fix bug in using a weak variable. Fix htab_delete loop counter isnan: Add isnan weak alias to __isnan mbtowc: Fix non compliant behavior for end of string Fix shm_open posix compliance error code [ARM] rtld: Avoid crash on R_ARM_NONE relocation extra/Configs/Config.in | 2 +- extra/Configs/Config.in.arch | 2 +- include/elf.h | 2 + include/link.h | 6 +- ldso/include/dl-elf.h | 2 +- ldso/include/dl-hash.h | 2 +- ldso/include/dl-string.h | 3 +- ldso/include/dl-syscall.h | 13 +- ldso/include/inline-hashtab.h | 2 +- ldso/ldso/Makefile.in | 2 - ldso/ldso/arm/dl-inlines.h | 1 + ldso/ldso/arm/dl-startup.h | 112 +++++++++++++- ldso/ldso/arm/dl-sysdep.h | 63 ++++++-- ldso/ldso/arm/elfinterp.c | 166 +++++++++++++++++---- ldso/ldso/arm/resolve.S | 23 +++ ldso/ldso/dl-elf.c | 6 +- ldso/ldso/dl-hash.c | 4 +- ldso/ldso/dl-tls.c | 1 + ldso/ldso/fdpic/dl-inlines.h | 2 + ldso/ldso/fdpic/dl-sysdep.h | 2 +- ldso/ldso/ldso.c | 23 ++- libc/misc/elf/dl-iterate-phdr.c | 2 +- libc/misc/internals/__uClibc_main.c | 47 +++++- libc/stdlib/stdlib.c | 6 +- libc/stdlib/system.c | 5 + libc/sysdeps/linux/arm/Makefile.arch | 2 +- libc/sysdeps/linux/arm/bits/elf-fdpic.h | 114 ++++++++++++++ libc/sysdeps/linux/arm/clone.S | 12 ++ libc/sysdeps/linux/arm/crt1.S | 66 ++++++++ libc/sysdeps/linux/arm/crtreloc.c | 144 ++++++++++++++++++ libc/sysdeps/linux/arm/find_exidx.c | 38 +++++ libc/sysdeps/linux/arm/find_got.c | 72 +++++++++ libm/s_isnan.c | 1 + libpthread/nptl/Makefile.in | 1 - libpthread/nptl/allocatestack.c | 6 + libpthread/nptl/linux_fsinfo.h | 5 +- libpthread/nptl/pthread_create.c | 4 + libpthread/nptl/sem_open.c | 8 +- libpthread/nptl/sysdeps/generic/libc-tls.c | 27 +++- libpthread/nptl/sysdeps/unix/sysv/linux/fork.c | 3 + .../sysdeps/unix/sysv/linux/libc_pthread_init.c | 4 + .../nptl/sysdeps/unix/sysv/linux/register-atfork.c | 14 +- .../sysdeps/unix/sysv/linux/unregister-atfork.c | 10 +- librt/shm.c | 3 + 44 files changed, 958 insertions(+), 75 deletions(-) create mode 100644 ldso/ldso/arm/dl-inlines.h create mode 100644 libc/sysdeps/linux/arm/bits/elf-fdpic.h create mode 100644 libc/sysdeps/linux/arm/crtreloc.c create mode 100644 libc/sysdeps/linux/arm/find_got.c -- 2.6.3

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