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cgo
[ DIR ]
drwxr-xr-x
debug
[ DIR ]
drwxr-xr-x
internal
[ DIR ]
drwxr-xr-x
msan
[ DIR ]
drwxr-xr-x
pprof
[ DIR ]
drwxr-xr-x
race
[ DIR ]
drwxr-xr-x
testdata
[ DIR ]
drwxr-xr-x
trace
[ DIR ]
drwxr-xr-x
HACKING.md
13.07
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Makefile
178
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alg.go
10.18
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asm.s
1.16
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asm_386.s
40.2
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asm_amd64.s
45.78
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asm_arm.s
30.89
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asm_arm64.s
33.12
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asm_mips64x.s
22.45
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asm_mipsx.s
24.72
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asm_ppc64x.h
1023
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asm_ppc64x.s
29.39
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asm_riscv64.s
17.38
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asm_s390x.s
26.35
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asm_wasm.s
9.65
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atomic_arm64.s
259
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atomic_mips64x.s
296
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atomic_mipsx.s
258
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atomic_pointer.go
2.62
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atomic_ppc64x.s
433
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atomic_riscv64.s
307
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auxv_none.go
358
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callers_test.go
7.7
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cgo.go
2.01
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cgo_mmap.go
2.38
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cgo_ppc64x.go
411
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cgo_sigaction.go
3.09
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cgocall.go
21.38
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cgocallback.go
317
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cgocheck.go
6.8
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chan.go
19.71
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chan_test.go
21.27
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chanbarrier_test.go
1.4
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checkptr.go
2.5
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checkptr_test.go
1.27
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closure_test.go
936
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compiler.go
413
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complex.go
1.59
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complex_test.go
1.05
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cpuflags.go
740
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cpuflags_amd64.go
533
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cpuprof.go
6.65
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cputicks.go
478
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crash_cgo_test.go
13.71
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crash_nonunix_test.go
385
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crash_test.go
20.24
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crash_unix_test.go
8.89
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debug.go
1.63
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debug_test.go
6.16
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debugcall.go
2.83
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debuglog.go
17.08
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debuglog_off.go
356
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debuglog_on.go
1.09
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debuglog_test.go
4.56
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defer_test.go
9.98
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defs1_linux.go
844
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defs1_netbsd_386.go
2.84
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defs1_netbsd_amd64.go
3.07
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defs1_netbsd_arm.go
2.96
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defs1_netbsd_arm64.go
3.18
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defs1_solaris_amd64.go
4.02
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defs2_linux.go
3.51
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defs3_linux.go
1.09
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defs_aix.go
4.16
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defs_aix_ppc64.go
3.61
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defs_arm_linux.go
2.67
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defs_darwin.go
3.84
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defs_darwin_386.go
5.98
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defs_darwin_amd64.go
6.07
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defs_darwin_arm.go
3.78
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defs_darwin_arm64.go
3.84
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defs_dragonfly.go
2.54
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defs_dragonfly_amd64.go
3.25
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defs_freebsd.go
3.84
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defs_freebsd_386.go
4.35
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defs_freebsd_amd64.go
4.62
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defs_freebsd_arm.go
3.68
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defs_freebsd_arm64.go
4
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defs_illumos_amd64.go
285
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defs_linux.go
3.04
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defs_linux_386.go
4.05
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defs_linux_amd64.go
4.56
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defs_linux_arm.go
3.31
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defs_linux_arm64.go
3.23
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defs_linux_mips64x.go
3.04
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defs_linux_mipsx.go
3.18
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defs_linux_ppc64.go
3.28
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defs_linux_ppc64le.go
3.28
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defs_linux_riscv64.go
3.27
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defs_linux_s390x.go
2.76
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defs_netbsd.go
2.74
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defs_netbsd_386.go
854
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defs_netbsd_amd64.go
1.01
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defs_netbsd_arm.go
763
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defs_openbsd.go
2.6
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defs_openbsd_386.go
2.63
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defs_openbsd_amd64.go
2.83
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defs_openbsd_arm.go
2.74
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defs_openbsd_arm64.go
2.34
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defs_plan9_386.go
1.47
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defs_plan9_amd64.go
1.66
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defs_plan9_arm.go
1.73
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defs_solaris.go
3.33
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defs_solaris_amd64.go
1003
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defs_windows.go
2.07
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defs_windows_386.go
3.75
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defs_windows_amd64.go
4.51
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defs_windows_arm.go
3.59
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duff_386.s
8.24
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duff_amd64.s
5.53
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duff_arm.s
7.11
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duff_arm64.s
5.25
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duff_mips64x.s
11.28
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duff_ppc64x.s
2.45
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duff_s390x.s
507
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env_plan9.go
855
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env_posix.go
1.82
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env_test.go
1.28
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error.go
7.26
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example_test.go
1.34
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export_aix_test.go
204
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export_arm_test.go
226
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export_darwin_test.go
351
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export_debug_test.go
5.28
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export_debuglog_test.go
1.27
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export_futex_test.go
529
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export_linux_test.go
429
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export_mmap_test.go
481
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export_solaris_test.go
282
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export_test.go
23.58
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export_unix_test.go
2.28
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export_windows_test.go
652
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extern.go
11.6
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fastlog2.go
1.22
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fastlog2_test.go
784
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fastlog2table.go
904
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float.go
1.35
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funcdata.h
2.44
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futex_test.go
2.1
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gc_test.go
13.22
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gcinfo_test.go
6.18
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go_tls.h
366
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hash32.go
2.51
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hash64.go
2.6
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hash_test.go
17.54
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heapdump.go
17.1
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iface.go
15.78
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iface_test.go
6.81
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lfstack.go
1.77
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lfstack_32bit.go
522
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lfstack_64bit.go
2.15
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lfstack_test.go
2.78
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libfuzzer.go
2.58
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libfuzzer_amd64.s
940
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libfuzzer_arm64.s
751
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lock_futex.go
5.06
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lock_js.go
5.45
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lock_sema.go
6.6
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malloc.go
48.32
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malloc_test.go
9.37
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map.go
42.13
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map_benchmark_test.go
10.16
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map_fast32.go
12.18
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map_fast64.go
12.37
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map_faststr.go
13.82
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map_test.go
27.11
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mbarrier.go
12.14
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mbitmap.go
67.53
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mcache.go
5.61
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mcentral.go
7.14
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mem_aix.go
1.93
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mem_bsd.go
2.05
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mem_darwin.go
1.88
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mem_js.go
2.32
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mem_linux.go
5.58
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mem_plan9.go
4.53
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mem_windows.go
3.86
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memclr_386.s
2.4
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memclr_amd64.s
3.65
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memclr_arm.s
2.44
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memclr_arm64.s
3.48
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memclr_mips64x.s
785
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memclr_mipsx.s
1.24
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memclr_plan9_386.s
905
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memclr_plan9_amd64.s
433
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memclr_ppc64x.s
4.2
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memclr_riscv64.s
848
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memclr_s390x.s
1.89
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memclr_wasm.s
544
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memmove_386.s
4.45
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memmove_amd64.s
12.33
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memmove_arm.s
5.9
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memmove_arm64.s
3.56
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memmove_linux_amd64_test.go
1.61
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memmove_mips64x.s
1.82
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memmove_mipsx.s
4.39
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memmove_plan9_386.s
3.06
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memmove_plan9_amd64.s
3.04
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memmove_ppc64x.s
3.33
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memmove_riscv64.s
1.81
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memmove_s390x.s
2.92
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memmove_test.go
10.97
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memmove_wasm.s
1.74
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mfinal.go
14.8
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mfinal_test.go
5.85
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mfixalloc.go
2.72
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mgc.go
74.87
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mgcmark.go
46.5
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mgcscavenge.go
30.95
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mgcscavenge_test.go
12.34
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mgcstack.go
10.55
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mgcsweep.go
14.79
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mgcsweepbuf.go
5.98
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mgcwork.go
14.24
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mheap.go
61.5
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mkduff.go
6.23
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mkfastlog2table.go
1.32
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mkpreempt.go
13.33
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mksizeclasses.go
8.62
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mmap.go
847
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mpagealloc.go
35.25
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mpagealloc_32bit.go
3.75
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mpagealloc_64bit.go
6.51
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mpagealloc_test.go
28.88
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mpagecache.go
5.03
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mpagecache_test.go
9.93
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mpallocbits.go
10.69
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mpallocbits_test.go
12.93
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mprof.go
24.06
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mranges.go
5.41
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msan.go
1.39
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msan0.go
647
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msan_amd64.s
2.03
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msan_arm64.s
1.69
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msize.go
785
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mstats.go
22.62
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mwbbuf.go
10.07
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nbpipe_fcntl_libc_test.go
463
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nbpipe_fcntl_unix_test.go
445
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nbpipe_pipe.go
411
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nbpipe_pipe2.go
509
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nbpipe_test.go
2.17
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net_plan9.go
645
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netpoll.go
14.46
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netpoll_aix.go
4.64
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netpoll_epoll.go
4
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netpoll_fake.go
648
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netpoll_kqueue.go
4.39
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netpoll_solaris.go
10.56
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netpoll_stub.go
1.3
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netpoll_windows.go
4.51
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norace_linux_test.go
888
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norace_test.go
979
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numcpu_freebsd_test.go
381
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os2_aix.go
20.67
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os2_freebsd.go
302
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os2_openbsd.go
296
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os2_plan9.go
1.48
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os2_solaris.go
320
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os3_plan9.go
3.99
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os3_solaris.go
16.92
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os_aix.go
8.29
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os_android.go
463
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os_darwin.go
10.59
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os_darwin_arm.go
749
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os_darwin_arm64.go
416
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os_dragonfly.go
6.2
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os_freebsd.go
10.97
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os_freebsd2.go
478
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os_freebsd_amd64.go
529
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os_freebsd_arm.go
1.32
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os_freebsd_arm64.go
2.97
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os_freebsd_noauxv.go
254
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os_illumos.go
3.93
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os_js.go
2.93
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os_linux.go
13.16
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os_linux_arm.go
1.35
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os_linux_arm64.go
1.02
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os_linux_be64.go
816
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os_linux_generic.go
916
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os_linux_mips64x.go
999
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os_linux_mipsx.go
1.05
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os_linux_noauxv.go
307
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os_linux_novdso.go
298
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os_linux_ppc64x.go
527
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os_linux_riscv64.go
198
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os_linux_s390x.go
455
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os_linux_x86.go
2.69
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os_netbsd.go
8.49
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os_netbsd_386.go
588
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os_netbsd_amd64.go
585
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os_netbsd_arm.go
1.13
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os_netbsd_arm64.go
827
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os_nonopenbsd.go
436
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os_only_solaris.go
356
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os_openbsd.go
7.81
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os_openbsd_arm.go
749
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os_openbsd_arm64.go
714
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os_plan9.go
9.3
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os_plan9_arm.go
462
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os_solaris.go
6.49
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os_windows.go
37.01
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os_windows_arm.go
511
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panic.go
42.23
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panic32.go
4.79
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plugin.go
4.16
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Code Editor : sys_linux_386.s
// Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // // System calls and other sys.stuff for 386, Linux // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" // Most linux systems use glibc's dynamic linker, which puts the // __kernel_vsyscall vdso helper at 0x10(GS) for easy access from position // independent code and setldt in runtime does the same in the statically // linked case. However, systems that use alternative libc such as Android's // bionic and musl, do not save the helper anywhere, and so the only way to // invoke a syscall from position independent code is boring old int $0x80 // (which is also what syscall wrappers in bionic/musl use). // // The benchmarks also showed that using int $0x80 is as fast as calling // *%gs:0x10 except on AMD Opteron. See https://golang.org/cl/19833 // for the benchmark program and raw data. //#define INVOKE_SYSCALL CALL 0x10(GS) // non-portable #define INVOKE_SYSCALL INT $0x80 #define SYS_exit 1 #define SYS_read 3 #define SYS_write 4 #define SYS_open 5 #define SYS_close 6 #define SYS_getpid 20 #define SYS_access 33 #define SYS_kill 37 #define SYS_pipe 42 #define SYS_brk 45 #define SYS_fcntl 55 #define SYS_munmap 91 #define SYS_socketcall 102 #define SYS_setittimer 104 #define SYS_clone 120 #define SYS_uname 122 #define SYS_mlock 150 #define SYS_sched_yield 158 #define SYS_nanosleep 162 #define SYS_rt_sigreturn 173 #define SYS_rt_sigaction 174 #define SYS_rt_sigprocmask 175 #define SYS_sigaltstack 186 #define SYS_mmap2 192 #define SYS_mincore 218 #define SYS_madvise 219 #define SYS_gettid 224 #define SYS_futex 240 #define SYS_sched_getaffinity 242 #define SYS_set_thread_area 243 #define SYS_exit_group 252 #define SYS_epoll_create 254 #define SYS_epoll_ctl 255 #define SYS_epoll_wait 256 #define SYS_clock_gettime 265 #define SYS_tgkill 270 #define SYS_epoll_create1 329 #define SYS_pipe2 331 TEXT runtime·exit(SB),NOSPLIT,$0 MOVL $SYS_exit_group, AX MOVL code+0(FP), BX INVOKE_SYSCALL INT $3 // not reached RET TEXT exit1<>(SB),NOSPLIT,$0 MOVL $SYS_exit, AX MOVL code+0(FP), BX INVOKE_SYSCALL INT $3 // not reached RET // func exitThread(wait *uint32) TEXT runtime·exitThread(SB),NOSPLIT,$0-4 MOVL wait+0(FP), AX // We're done using the stack. MOVL $0, (AX) MOVL $1, AX // exit (just this thread) MOVL $0, BX // exit code INT $0x80 // no stack; must not use CALL // We may not even have a stack any more. INT $3 JMP 0(PC) TEXT runtime·open(SB),NOSPLIT,$0 MOVL $SYS_open, AX MOVL name+0(FP), BX MOVL mode+4(FP), CX MOVL perm+8(FP), DX INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS 2(PC) MOVL $-1, AX MOVL AX, ret+12(FP) RET TEXT runtime·closefd(SB),NOSPLIT,$0 MOVL $SYS_close, AX MOVL fd+0(FP), BX INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS 2(PC) MOVL $-1, AX MOVL AX, ret+4(FP) RET TEXT runtime·write1(SB),NOSPLIT,$0 MOVL $SYS_write, AX MOVL fd+0(FP), BX MOVL p+4(FP), CX MOVL n+8(FP), DX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET TEXT runtime·read(SB),NOSPLIT,$0 MOVL $SYS_read, AX MOVL fd+0(FP), BX MOVL p+4(FP), CX MOVL n+8(FP), DX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // func pipe() (r, w int32, errno int32) TEXT runtime·pipe(SB),NOSPLIT,$0-12 MOVL $SYS_pipe, AX LEAL r+0(FP), BX INVOKE_SYSCALL MOVL AX, errno+8(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT,$0-16 MOVL $SYS_pipe2, AX LEAL r+4(FP), BX MOVL flags+0(FP), CX INVOKE_SYSCALL MOVL AX, errno+12(FP) RET TEXT runtime·usleep(SB),NOSPLIT,$8 MOVL $0, DX MOVL usec+0(FP), AX MOVL $1000000, CX DIVL CX MOVL AX, 0(SP) MOVL $1000, AX // usec to nsec MULL DX MOVL AX, 4(SP) // nanosleep(&ts, 0) MOVL $SYS_nanosleep, AX LEAL 0(SP), BX MOVL $0, CX INVOKE_SYSCALL RET TEXT runtime·gettid(SB),NOSPLIT,$0-4 MOVL $SYS_gettid, AX INVOKE_SYSCALL MOVL AX, ret+0(FP) RET TEXT runtime·raise(SB),NOSPLIT,$12 MOVL $SYS_getpid, AX INVOKE_SYSCALL MOVL AX, BX // arg 1 pid MOVL $SYS_gettid, AX INVOKE_SYSCALL MOVL AX, CX // arg 2 tid MOVL sig+0(FP), DX // arg 3 signal MOVL $SYS_tgkill, AX INVOKE_SYSCALL RET TEXT runtime·raiseproc(SB),NOSPLIT,$12 MOVL $SYS_getpid, AX INVOKE_SYSCALL MOVL AX, BX // arg 1 pid MOVL sig+0(FP), CX // arg 2 signal MOVL $SYS_kill, AX INVOKE_SYSCALL RET TEXT ·getpid(SB),NOSPLIT,$0-4 MOVL $SYS_getpid, AX INVOKE_SYSCALL MOVL AX, ret+0(FP) RET TEXT ·tgkill(SB),NOSPLIT,$0 MOVL $SYS_tgkill, AX MOVL tgid+0(FP), BX MOVL tid+4(FP), CX MOVL sig+8(FP), DX INVOKE_SYSCALL RET TEXT runtime·setitimer(SB),NOSPLIT,$0-12 MOVL $SYS_setittimer, AX MOVL mode+0(FP), BX MOVL new+4(FP), CX MOVL old+8(FP), DX INVOKE_SYSCALL RET TEXT runtime·mincore(SB),NOSPLIT,$0-16 MOVL $SYS_mincore, AX MOVL addr+0(FP), BX MOVL n+4(FP), CX MOVL dst+8(FP), DX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // func walltime1() (sec int64, nsec int32) TEXT runtime·walltime1(SB), NOSPLIT, $0-12 // We don't know how much stack space the VDSO code will need, // so switch to g0. MOVL SP, BP // Save old SP; BP unchanged by C code. get_tls(CX) MOVL g(CX), AX MOVL g_m(AX), SI // SI unchanged by C code. // Set vdsoPC and vdsoSP for SIGPROF traceback. LEAL sec+0(FP), DX MOVL -4(DX), CX MOVL CX, m_vdsoPC(SI) MOVL DX, m_vdsoSP(SI) CMPL AX, m_curg(SI) // Only switch if on curg. JNE noswitch MOVL m_g0(SI), DX MOVL (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack noswitch: SUBL $16, SP // Space for results ANDL $~15, SP // Align for C code // Stack layout, depending on call path: // x(SP) vDSO INVOKE_SYSCALL // 12 ts.tv_nsec ts.tv_nsec // 8 ts.tv_sec ts.tv_sec // 4 &ts - // 0 CLOCK_<id> - MOVL runtime·vdsoClockgettimeSym(SB), AX CMPL AX, $0 JEQ fallback LEAL 8(SP), BX // &ts (struct timespec) MOVL BX, 4(SP) MOVL $0, 0(SP) // CLOCK_REALTIME CALL AX JMP finish fallback: MOVL $SYS_clock_gettime, AX MOVL $0, BX // CLOCK_REALTIME LEAL 8(SP), CX INVOKE_SYSCALL finish: MOVL 8(SP), AX // sec MOVL 12(SP), BX // nsec MOVL BP, SP // Restore real SP MOVL $0, m_vdsoSP(SI) // sec is in AX, nsec in BX MOVL AX, sec_lo+0(FP) MOVL $0, sec_hi+4(FP) MOVL BX, nsec+8(FP) RET // int64 nanotime(void) so really // void nanotime(int64 *nsec) TEXT runtime·nanotime1(SB), NOSPLIT, $0-8 // Switch to g0 stack. See comment above in runtime·walltime. MOVL SP, BP // Save old SP; BP unchanged by C code. get_tls(CX) MOVL g(CX), AX MOVL g_m(AX), SI // SI unchanged by C code. // Set vdsoPC and vdsoSP for SIGPROF traceback. LEAL ret+0(FP), DX MOVL -4(DX), CX MOVL CX, m_vdsoPC(SI) MOVL DX, m_vdsoSP(SI) CMPL AX, m_curg(SI) // Only switch if on curg. JNE noswitch MOVL m_g0(SI), DX MOVL (g_sched+gobuf_sp)(DX), SP // Set SP to g0 stack noswitch: SUBL $16, SP // Space for results ANDL $~15, SP // Align for C code MOVL runtime·vdsoClockgettimeSym(SB), AX CMPL AX, $0 JEQ fallback LEAL 8(SP), BX // &ts (struct timespec) MOVL BX, 4(SP) MOVL $1, 0(SP) // CLOCK_MONOTONIC CALL AX JMP finish fallback: MOVL $SYS_clock_gettime, AX MOVL $1, BX // CLOCK_MONOTONIC LEAL 8(SP), CX INVOKE_SYSCALL finish: MOVL 8(SP), AX // sec MOVL 12(SP), BX // nsec MOVL BP, SP // Restore real SP MOVL $0, m_vdsoSP(SI) // sec is in AX, nsec in BX // convert to DX:AX nsec MOVL $1000000000, CX MULL CX ADDL BX, AX ADCL $0, DX MOVL AX, ret_lo+0(FP) MOVL DX, ret_hi+4(FP) RET TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0 MOVL $SYS_rt_sigprocmask, AX MOVL how+0(FP), BX MOVL new+4(FP), CX MOVL old+8(FP), DX MOVL size+12(FP), SI INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS 2(PC) INT $3 RET TEXT runtime·rt_sigaction(SB),NOSPLIT,$0 MOVL $SYS_rt_sigaction, AX MOVL sig+0(FP), BX MOVL new+4(FP), CX MOVL old+8(FP), DX MOVL size+12(FP), SI INVOKE_SYSCALL MOVL AX, ret+16(FP) RET TEXT runtime·sigfwd(SB),NOSPLIT,$12-16 MOVL fn+0(FP), AX MOVL sig+4(FP), BX MOVL info+8(FP), CX MOVL ctx+12(FP), DX MOVL SP, SI SUBL $32, SP ANDL $-15, SP // align stack: handler might be a C function MOVL BX, 0(SP) MOVL CX, 4(SP) MOVL DX, 8(SP) MOVL SI, 12(SP) // save SI: handler might be a Go function CALL AX MOVL 12(SP), AX MOVL AX, SP RET TEXT runtime·sigtramp(SB),NOSPLIT,$28 // Save callee-saved C registers, since the caller may be a C signal handler. MOVL BX, bx-4(SP) MOVL BP, bp-8(SP) MOVL SI, si-12(SP) MOVL DI, di-16(SP) // We don't save mxcsr or the x87 control word because sigtrampgo doesn't // modify them. MOVL sig+0(FP), BX MOVL BX, 0(SP) MOVL info+4(FP), BX MOVL BX, 4(SP) MOVL ctx+8(FP), BX MOVL BX, 8(SP) CALL runtime·sigtrampgo(SB) MOVL di-16(SP), DI MOVL si-12(SP), SI MOVL bp-8(SP), BP MOVL bx-4(SP), BX RET TEXT runtime·cgoSigtramp(SB),NOSPLIT,$0 JMP runtime·sigtramp(SB) TEXT runtime·sigreturn(SB),NOSPLIT,$0 MOVL $SYS_rt_sigreturn, AX // Sigreturn expects same SP as signal handler, // so cannot CALL 0x10(GS) here. INT $0x80 INT $3 // not reached RET TEXT runtime·mmap(SB),NOSPLIT,$0 MOVL $SYS_mmap2, AX MOVL addr+0(FP), BX MOVL n+4(FP), CX MOVL prot+8(FP), DX MOVL flags+12(FP), SI MOVL fd+16(FP), DI MOVL off+20(FP), BP SHRL $12, BP INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS ok NOTL AX INCL AX MOVL $0, p+24(FP) MOVL AX, err+28(FP) RET ok: MOVL AX, p+24(FP) MOVL $0, err+28(FP) RET TEXT runtime·munmap(SB),NOSPLIT,$0 MOVL $SYS_munmap, AX MOVL addr+0(FP), BX MOVL n+4(FP), CX INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS 2(PC) INT $3 RET TEXT runtime·madvise(SB),NOSPLIT,$0 MOVL $SYS_madvise, AX MOVL addr+0(FP), BX MOVL n+4(FP), CX MOVL flags+8(FP), DX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // int32 futex(int32 *uaddr, int32 op, int32 val, // struct timespec *timeout, int32 *uaddr2, int32 val2); TEXT runtime·futex(SB),NOSPLIT,$0 MOVL $SYS_futex, AX MOVL addr+0(FP), BX MOVL op+4(FP), CX MOVL val+8(FP), DX MOVL ts+12(FP), SI MOVL addr2+16(FP), DI MOVL val3+20(FP), BP INVOKE_SYSCALL MOVL AX, ret+24(FP) RET // int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void)); TEXT runtime·clone(SB),NOSPLIT,$0 MOVL $SYS_clone, AX MOVL flags+0(FP), BX MOVL stk+4(FP), CX MOVL $0, DX // parent tid ptr MOVL $0, DI // child tid ptr // Copy mp, gp, fn off parent stack for use by child. SUBL $16, CX MOVL mp+8(FP), SI MOVL SI, 0(CX) MOVL gp+12(FP), SI MOVL SI, 4(CX) MOVL fn+16(FP), SI MOVL SI, 8(CX) MOVL $1234, 12(CX) // cannot use CALL 0x10(GS) here, because the stack changes during the // system call (after CALL 0x10(GS), the child is still using the // parent's stack when executing its RET instruction). INT $0x80 // In parent, return. CMPL AX, $0 JEQ 3(PC) MOVL AX, ret+20(FP) RET // Paranoia: check that SP is as we expect. NOP SP // tell vet SP changed - stop checking offsets MOVL 12(SP), BP CMPL BP, $1234 JEQ 2(PC) INT $3 // Initialize AX to Linux tid MOVL $SYS_gettid, AX INVOKE_SYSCALL MOVL 0(SP), BX // m MOVL 4(SP), DX // g MOVL 8(SP), SI // fn CMPL BX, $0 JEQ nog CMPL DX, $0 JEQ nog MOVL AX, m_procid(BX) // save tid as m->procid // set up ldt 7+id to point at m->tls. LEAL m_tls(BX), BP MOVL m_id(BX), DI ADDL $7, DI // m0 is LDT#7. count up. // setldt(tls#, &tls, sizeof tls) PUSHAL // save registers PUSHL $32 // sizeof tls PUSHL BP // &tls PUSHL DI // tls # CALL runtime·setldt(SB) POPL AX POPL AX POPL AX POPAL // Now segment is established. Initialize m, g. get_tls(AX) MOVL DX, g(AX) MOVL BX, g_m(DX) CALL runtime·stackcheck(SB) // smashes AX, CX MOVL 0(DX), DX // paranoia; check they are not nil MOVL 0(BX), BX // more paranoia; check that stack splitting code works PUSHAL CALL runtime·emptyfunc(SB) POPAL nog: CALL SI // fn() CALL exit1<>(SB) MOVL $0x1234, 0x1005 TEXT runtime·sigaltstack(SB),NOSPLIT,$-8 MOVL $SYS_sigaltstack, AX MOVL new+0(FP), BX MOVL old+4(FP), CX INVOKE_SYSCALL CMPL AX, $0xfffff001 JLS 2(PC) INT $3 RET // <asm-i386/ldt.h> // struct user_desc { // unsigned int entry_number; // unsigned long base_addr; // unsigned int limit; // unsigned int seg_32bit:1; // unsigned int contents:2; // unsigned int read_exec_only:1; // unsigned int limit_in_pages:1; // unsigned int seg_not_present:1; // unsigned int useable:1; // }; #define SEG_32BIT 0x01 // contents are the 2 bits 0x02 and 0x04. #define CONTENTS_DATA 0x00 #define CONTENTS_STACK 0x02 #define CONTENTS_CODE 0x04 #define READ_EXEC_ONLY 0x08 #define LIMIT_IN_PAGES 0x10 #define SEG_NOT_PRESENT 0x20 #define USEABLE 0x40 // `-1` means the kernel will pick a TLS entry on the first setldt call, // which happens during runtime init, and that we'll store back the saved // entry and reuse that on subsequent calls when creating new threads. DATA runtime·tls_entry_number+0(SB)/4, $-1 GLOBL runtime·tls_entry_number(SB), NOPTR, $4 // setldt(int entry, int address, int limit) // We use set_thread_area, which mucks with the GDT, instead of modify_ldt, // which would modify the LDT, but is disabled on some kernels. // The name, setldt, is a misnomer, although we leave this name as it is for // the compatibility with other platforms. TEXT runtime·setldt(SB),NOSPLIT,$32 MOVL base+4(FP), DX #ifdef GOOS_android // Android stores the TLS offset in runtime·tls_g. SUBL runtime·tls_g(SB), DX MOVL DX, 0(DX) #else /* * When linking against the system libraries, * we use its pthread_create and let it set up %gs * for us. When we do that, the private storage * we get is not at 0(GS), but -4(GS). * To insulate the rest of the tool chain from this * ugliness, 8l rewrites 0(TLS) into -4(GS) for us. * To accommodate that rewrite, we translate * the address here and bump the limit to 0xffffffff (no limit) * so that -4(GS) maps to 0(address). * Also, the final 0(GS) (current 4(DX)) has to point * to itself, to mimic ELF. */ ADDL $0x4, DX // address MOVL DX, 0(DX) #endif // get entry number MOVL runtime·tls_entry_number(SB), CX // set up user_desc LEAL 16(SP), AX // struct user_desc MOVL CX, 0(AX) // unsigned int entry_number MOVL DX, 4(AX) // unsigned long base_addr MOVL $0xfffff, 8(AX) // unsigned int limit MOVL $(SEG_32BIT|LIMIT_IN_PAGES|USEABLE|CONTENTS_DATA), 12(AX) // flag bits // call set_thread_area MOVL AX, BX // user_desc MOVL $SYS_set_thread_area, AX // We can't call this via 0x10(GS) because this is called from setldt0 to set that up. INT $0x80 // breakpoint on error CMPL AX, $0xfffff001 JLS 2(PC) INT $3 // read allocated entry number back out of user_desc LEAL 16(SP), AX // get our user_desc back MOVL 0(AX), AX // store entry number if the kernel allocated it CMPL CX, $-1 JNE 2(PC) MOVL AX, runtime·tls_entry_number(SB) // compute segment selector - (entry*8+3) SHLL $3, AX ADDL $3, AX MOVW AX, GS RET TEXT runtime·osyield(SB),NOSPLIT,$0 MOVL $SYS_sched_yield, AX INVOKE_SYSCALL RET TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0 MOVL $SYS_sched_getaffinity, AX MOVL pid+0(FP), BX MOVL len+4(FP), CX MOVL buf+8(FP), DX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // int32 runtime·epollcreate(int32 size); TEXT runtime·epollcreate(SB),NOSPLIT,$0 MOVL $SYS_epoll_create, AX MOVL size+0(FP), BX INVOKE_SYSCALL MOVL AX, ret+4(FP) RET // int32 runtime·epollcreate1(int32 flags); TEXT runtime·epollcreate1(SB),NOSPLIT,$0 MOVL $SYS_epoll_create1, AX MOVL flags+0(FP), BX INVOKE_SYSCALL MOVL AX, ret+4(FP) RET // func epollctl(epfd, op, fd int32, ev *epollEvent) int TEXT runtime·epollctl(SB),NOSPLIT,$0 MOVL $SYS_epoll_ctl, AX MOVL epfd+0(FP), BX MOVL op+4(FP), CX MOVL fd+8(FP), DX MOVL ev+12(FP), SI INVOKE_SYSCALL MOVL AX, ret+16(FP) RET // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout); TEXT runtime·epollwait(SB),NOSPLIT,$0 MOVL $SYS_epoll_wait, AX MOVL epfd+0(FP), BX MOVL ev+4(FP), CX MOVL nev+8(FP), DX MOVL timeout+12(FP), SI INVOKE_SYSCALL MOVL AX, ret+16(FP) RET // void runtime·closeonexec(int32 fd); TEXT runtime·closeonexec(SB),NOSPLIT,$0 MOVL $SYS_fcntl, AX MOVL fd+0(FP), BX // fd MOVL $2, CX // F_SETFD MOVL $1, DX // FD_CLOEXEC INVOKE_SYSCALL RET // func runtime·setNonblock(fd int32) TEXT runtime·setNonblock(SB),NOSPLIT,$0-4 MOVL $SYS_fcntl, AX MOVL fd+0(FP), BX // fd MOVL $3, CX // F_GETFL MOVL $0, DX INVOKE_SYSCALL MOVL fd+0(FP), BX // fd MOVL $4, CX // F_SETFL MOVL $0x800, DX // O_NONBLOCK ORL AX, DX MOVL $SYS_fcntl, AX INVOKE_SYSCALL RET // int access(const char *name, int mode) TEXT runtime·access(SB),NOSPLIT,$0 MOVL $SYS_access, AX MOVL name+0(FP), BX MOVL mode+4(FP), CX INVOKE_SYSCALL MOVL AX, ret+8(FP) RET // int connect(int fd, const struct sockaddr *addr, socklen_t addrlen) TEXT runtime·connect(SB),NOSPLIT,$0-16 // connect is implemented as socketcall(NR_socket, 3, *(rest of args)) // stack already should have fd, addr, addrlen. MOVL $SYS_socketcall, AX MOVL $3, BX // connect LEAL fd+0(FP), CX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // int socket(int domain, int type, int protocol) TEXT runtime·socket(SB),NOSPLIT,$0-16 // socket is implemented as socketcall(NR_socket, 1, *(rest of args)) // stack already should have domain, type, protocol. MOVL $SYS_socketcall, AX MOVL $1, BX // socket LEAL domain+0(FP), CX INVOKE_SYSCALL MOVL AX, ret+12(FP) RET // func sbrk0() uintptr TEXT runtime·sbrk0(SB),NOSPLIT,$0-4 // Implemented as brk(NULL). MOVL $SYS_brk, AX MOVL $0, BX // NULL INVOKE_SYSCALL MOVL AX, ret+0(FP) RET // func uname(utsname *new_utsname) int TEXT ·uname(SB),NOSPLIT,$0-8 MOVL $SYS_uname, AX MOVL utsname+0(FP), BX INVOKE_SYSCALL MOVL AX, ret+4(FP) RET // func mlock(addr, len uintptr) int TEXT ·mlock(SB),NOSPLIT,$0-12 MOVL $SYS_mlock, AX MOVL addr+0(FP), BX MOVL len+4(FP), CX INVOKE_SYSCALL MOVL AX, ret+8(FP) RET
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