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* runtime: inform arena placement using sbrk(0)Austin Clements2017-04-211-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 32-bit architectures (or if we fail to map a 64-bit-style arena), we try to map the heap arena just above the end of the process image. While we can accept any address, using lower addresses is preferable because lower addresses cause us to map less of the heap bitmap. However, if a program is linked against C code that has global constructors, those constructors may call brk/sbrk to allocate memory (e.g., many C malloc implementations do this for small allocations). The brk also starts just above the process image, so this may adjust the brk past the beginning of where we want to put the heap arena. In this case, the kernel will pick a different address for the arena and it will usually be very high (at least, as these things go in a 32-bit address space). Fix this by consulting the current value of the brk and using this in addition to the end of the process image to compute the initial arena placement. This is implemented only on Linux currently, since we have no evidence that it's an issue on any other OSes. Fixes #19831. Change-Id: Id64b45d08d8c91e4f50d92d0339146250b04f2f8 Reviewed-on: https://go-review.googlesource.com/39810 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
* time: record monotonic clock reading in time.Now, for more accurate comparisonsRuss Cox2017-02-031-2/+2
| | | | | | | | | | | | | See https://golang.org/design/12914-monotonic for details. Fixes #12914. Change-Id: I80edc2e6c012b4ace7161c84cf067d444381a009 Reviewed-on: https://go-review.googlesource.com/36255 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Caleb Spare <cespare@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
* runtime: use clock_gettime(CLOCK_REALTIME) for nanosecond-precision time.now ↵Russ Cox2016-10-271-7/+4
| | | | | | | | | | | | | | | | on arm64, mips64x Assembly copied from the clock_gettime(CLOCK_MONOTONIC) call in runtime.nanotime in these files and then modified to use CLOCK_REALTIME. Also comment system call numbers in a few other files. Fixes #11222. Change-Id: Ie132086de7386f865908183aac2713f90fc73e0d Reviewed-on: https://go-review.googlesource.com/32177 Reviewed-by: Cherry Zhang <cherryyz@google.com>
* runtime: unify some signal handling functionsIan Lance Taylor2016-09-241-1/+1
| | | | | | | | | | | | | | Unify the OS-specific versions of msigsave, msigrestore, sigblock, updatesigmask, and unblocksig into single versions in signal_unix.go. To do this, make sigprocmask work the same way on all systems, which required adding a definition of sigprocmask for linux and openbsd. Also add a single OS-specific function sigmaskToSigset. Change-Id: I7cbf75131dddb57eeefe648ef845b0791404f785 Reviewed-on: https://go-review.googlesource.com/29689 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: David Crawshaw <crawshaw@golang.org>
* cmd/compile, runtime, etc: get rid of constant FP registersCherry Zhang2016-08-301-5/+0
| | | | | | | | | | | | | | | On ARM64, MIPS64, and PPC64, some floating point registers were reserved for constants 0, 1, 2, 0.5, etc. This CL removes them. On ARM64, they are never used. On MIPS64 and PPC64, the only use case is a multiplication-by-2 in the old backend of the compiler, which is replaced with an addition. Change-Id: I737cbf43283756e3408964fc88c567a938c57036 Reviewed-on: https://go-review.googlesource.com/28095 Run-TryBot: Cherry Zhang <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
* all: fix assembly vet issuesJosh Bleecher Snyder2016-08-251-2/+2
| | | | | | | | | | | | | | | | | | | Add missing function prototypes. Fix function prototypes. Use FP references instead of SP references. Fix variable names. Update comments. Clean up whitespace. (Not for vet.) All fairly minor fixes to make vet happy. Updates #11041 Change-Id: Ifab2cdf235ff61cdc226ab1d84b8467b5ac9446c Reviewed-on: https://go-review.googlesource.com/27713 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
* runtime: add linux/mips64x cgo supportCherry Zhang2016-05-041-2/+2
| | | | | | Change-Id: Id40dd05b7b264f3b779fdf9ccc2421ba4bc70589 Reviewed-on: https://go-review.googlesource.com/19806 Reviewed-by: Minux Ma <minux@golang.org>
* cmd/internal/obj/mips et al.: introduce SB register on mips64xCherry Zhang2016-05-011-2/+6
| | | | | | | | | | | | | | | | | | | | | SB register (R28) is introduced for access external addresses with shorter instruction sequences. It is loaded at entry points. External data within 2G of SB can be accessed this way. cmd/internal/obj: relocaltion R_ADDRMIPS is split into two relocations R_ADDRMIPS and R_ADDRMIPSU, handling the low 16 bits and the "upper" 16 bits of external addresses, respectively, since the instructios may not be adjacent. It might be better if relocation Variant could be used. cmd/link/internal/mips64: support new relocations. cmd/compile/internal/mips64: reserve SB register. runtime: initialize SB register at entry points. Change-Id: I5f34868f88c5a9698c042a8a1f12f76806c187b9 Reviewed-on: https://go-review.googlesource.com/19802 Reviewed-by: Minux Ma <minux@golang.org>
* runtime: support symbolic backtrace of C code in a cgo crashIan Lance Taylor2016-04-011-0/+4
| | | | | | | | | | | | | | | | The new function runtime.SetCgoTraceback may be used to register stack traceback and symbolizer functions, written in C, to do a stack traceback from cgo code. There is a sample implementation of runtime.SetCgoSymbolizer at github.com/ianlancetaylor/cgosymbolizer. Just importing that package is sufficient to get symbolic C backtraces. Currently only supported on linux/amd64. Change-Id: If96ee2eb41c6c7379d407b9561b87557bfe47341 Reviewed-on: https://go-review.googlesource.com/17761 Reviewed-by: Austin Clements <austin@google.com>
* runtime: fix errno sign for some mmap and mincore casesIan Lance Taylor2016-02-121-0/+1
| | | | | | | | | | | | | | | | | | | | | | | The caller of mmap expects it to return a positive errno value, but the linux-arm64 and nacl-386 system calls returned a negative errno value. Correct them to negate the errno value. The caller of mincore expects it to return a negative errno value (yes, this is inconsistent), but the linux-mips64x and linux-ppc64x system call returned a positive errno value. Correct them to negate the errno value. Add a test that mmap returns errno with the correct sign. Brad added a test for mincore's errno value in https://golang.org/cl/19457. Fixes #14297. Change-Id: I2b93f32e679bd1eae1c9aef9ae7bcf0ba39521b5 Reviewed-on: https://go-review.googlesource.com/19455 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Minux Ma <minux@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
* runtime: added assembly part of linux/mips64{,le} supportYao Zhang2015-11-121-0/+427
Change-Id: I9e94027ef66c88007107de2b2b75c3d7cf1352af Reviewed-on: https://go-review.googlesource.com/14467 Reviewed-by: Minux Ma <minux@golang.org>
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