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Time Loop Mac Os Catalina
mach_absolute_time.s
| // Source from the xnu kernel used in macOS |
| // source https://opensource.apple.com/source/xnu/xnu-3248.60.10/libsyscall/wrappers/mach_absolute_time.s |
| .globl _mach_absolute_time |
| _mach_absolute_time: |
| pushq%rbp// set up a frame for backtraces |
| movq%rsp,%rbp |
| movq $(_COMM_PAGE_TIME_DATA_START),%rsi |
| 1: |
| movl _NT_GENERATION(%rsi),%r8d// get generation |
| testl%r8d,%r8d// if 0, data is being changed. |
| jz 1b // .so loop until stable |
| lfence |
| rdtsc// edx:eax := tsc |
| lfence |
| shlq$32,%rdx// rax := ((edx << 32) | eax), ie 64-bit tsc |
| orq%rdx,%rax |
| /* |
| * Prior to supporting 'slow' processors, xnu always set _NT_SHIFT to 32. |
| * Now it defaults to 0, unless the processor is slow. In order to maintain |
| * compatibility with both old and new versions of xnu, we mask the shift |
| * down to 0x1F, which maps the old default (32) into the new default (0). |
| */ |
| movl _NT_SHIFT(%rsi),%ecx |
| andl$0x1F,%ecx// *** remove this line once 10.9 is GM *** |
| subq _NT_TSC_BASE(%rsi), %rax// rax := (tsc - base_tsc) |
| shlq%cl,%rax// rax := (tsc - base_tsc) << NT_SHIFT |
| movl _NT_SCALE(%rsi),%ecx |
| mulq%rcx// rdx:rax := ((tsc - base_tsc)< |
| shrdq$32,%rdx,%rax// divide by 2**32 |
| addq _NT_NS_BASE(%rsi),%rax// (((tsc - base_tsc) * scale) >> 32) + ns_base |
| cmpl _NT_GENERATION(%rsi),%r8d// did the data change during computation? |
| jne 1b |
| popq%rbp |
| ret |
time.c
| #include<stdio.h> |
| #include<mach/mach_time.h> |
| intmain() |
| { |
| uint64_t t = mach_absolute_time(); |
| printf('%lldn', (longlong) t); |
| return (0); |
| } |
time_amd64-v2.s
| TEXT ·mach_absolute_tim(SB), NOSPLIT, $32 |
| MOVQ $0x7fffffe00000, SI // comm page base |
| timeloop: |
| MOVL nt_generation(SI), R8 |
| TESTL R8, R8 |
| JZ timeloop |
| RDTSC |
| SHLQ $32, DX |
| ORQ DX, AX |
| MOVL nt_shift(SI), CX |
| SUBQ nt_tsc_base(SI), AX |
| SHLQ CX, AX |
| MOVL nt_scale(SI), CX |
| MULQ CX |
| SHRQ $32, AX:DX |
| ADDQ nt_ns_base(SI), AX |
| CMPL nt_generation(SI), R8 |
| JNE timeloop |
| MOVQ AX, ret+0(FP) |
| RET |
time_amd64.s
Time Loop Mac Os 11
| // Implementation of mach_absolute_time in Go AST |
| // based on https://golang.org/src/runtime/sys_darwin_amd64.s |
| #include'textflag.h' |
| // OS X comm page time offsets |
| // http://www.opensource.apple.com/source/xnu/xnu-1699.26.8/osfmk/i386/cpu_capabilities.h |
| #define nt_tsc_base 0x50 |
| #define nt_scale 0x58 |
| #define nt_shift 0x5c |
| #define nt_ns_base 0x60 |
| #define nt_generation 0x68 |
| TEXT ·mach_absolute_time(SB),NOSPLIT,$0-8 |
| MOVQ$0x7fffffe00000, BP /* comm page base */ |
| timeloop: |
| MOVQ nt_generation(BP), R8 |
| TESTL R8, R8 |
| JZ timeloop |
| RDTSC |
| SHLQ$32, DX |
| ORQ DX, AX |
| MOVL nt_shift(BP), R9 |
| ANDL$0x1F, R9 |
| SUBQ nt_tsc_base(BP), AX |
| SHLQ CX, AX |
| MOVL nt_scale(BP), R9 |
| MULQ R10 |
| SHRQ$32, AX:DX |
| ADDQ nt_ns_base(BP), AX |
| CMPL nt_generation(BP), R8 |
| JNE timeloop |
| RET |
Time Loop Mac Os Download
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