 RealView Compiler User's Guide | |
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RealView Compiler User's Guide
Preface Introduction Getting started with the ARM Compiler Compiler Features Coding Practices Diagnostic Messages Using the Inline and Embedded Assemblers Semihosting About semihosting
What is semihosting? The semihosting interface Semihosting implementation RealView ARMulator ISS RealView ICE Instruction Set System Model RealMonitor Semihosting operations angel_SWIreason_EnterSVC (0x17) angel_SWIreason_ReportException (0x18) SYS_CLOSE (0x02) SYS_CLOCK (0x10) SYS_ELAPSED (0x30) SYS_ERRNO (0x13) SYS_FLEN (0x0C) SYS_GET_CMDLINE (0x15) SYS_HEAPINFO (0x16) SYS_ISERROR (0x08) SYS_ISTTY (0x09) SYS_OPEN (0x01) SYS_READ (0x06) SYS_READC (0x07) SYS_REMOVE (0x0E) SYS_RENAME (0x0F) SYS_SEEK (0x0A) SYS_SYSTEM (0x12) SYS_TICKFREQ (0x31) SYS_TIME (0x11) SYS_TMPNAM (0x0D) SYS_WRITE (0x05) SYS_WRITEC (0x03) SYS_WRITE0 (0x04) Debug agent interaction SVCsSYS_CLOCK (0x10)
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Home > Semihosting > Semihosting operations > SYS_CLOCK (0x10) | |||
Returns the number of centiseconds since the execution started.
Values returned by this SVC can be of limited use for some benchmarking purposes because of communication overhead or other agent‑specific factors. For example, with RealView ICE the request is passed back to the host for execution. This can lead to unpredictable delays in transmission and process scheduling.
Use this function to calculate time intervals, by calculating differences between intervals with and without the code sequence to be timed.
Some systems enable more accurate timing, see SYS_ELAPSED (0x30) and SYS_TICKFREQ (0x31).
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