mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
8f522cb702
This change progresses our AARCH64 support:
- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64
This change makes general improvements to Cosmo and Redbean:
- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_RDTSC_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_RDTSC_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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/**
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* Reads CPU timestamp counter.
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*
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* This macro inhibits compiler magic.
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* This macro does not inhibit CPU magic.
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*
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* @see X86_HAVE(INVTSC)
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*/
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#define rdtsc() __RDTSC("rdtsc")
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/**
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* Reads CPU timestamp counter w/ full serialization.
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*
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* This macro inhibits CPU magic.
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* This macro inhibits compiler magic.
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*
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* The clock isn't read until:
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*
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* 1. previous instructions finish executing; and
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* 2. previous loads are globally visible; and
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* 3. previous stores are globally visible.
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*
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* Later instructions won't dispatch until RDTSC completes.
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*
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* @see X86_HAVE(INVTSC)
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*/
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#define mfence_lfence_rdtsc_lfence() \
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__RDTSC("mfence\n\tlfence\n\trdtsc\n\tlfence")
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#ifdef __x86__
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#define __RDTSC(ASM) \
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({ \
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uint64_t Rax, Rdx; \
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asm volatile(ASM : "=a"(Rax), "=d"(Rdx) : /* no inputs */ : "memory"); \
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Rdx << 32 | Rax; \
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})
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#elif defined(__aarch64__)
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#define __RDTSC(ASM) \
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({ \
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uint64_t _Ts; \
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asm volatile("mrs\t%0,cntvct_el0" : "=r"(_Ts)); \
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_Ts * 48; /* the fudge factor */ \
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})
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#elif defined(__powerpc64__)
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#define __RDTSC(ASM) \
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({ \
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uint64_t _Ts; \
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asm volatile("mfspr\t%0,268" : "=r"(_Ts)); \
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_Ts; \
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})
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#elif defined(__riscv)
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#define __RDTSC(ASM) \
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({ \
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uint64_t _Ts; \
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asm volatile("rdcycle\t%0" : "=r"(_Ts)); \
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_Ts; \
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})
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#endif
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_RDTSC_H_ */
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