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The Go programming language
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CL 3075041 says ARM is not little-endian, but my test suggests otherwise. My test program is: package main import ("fmt"; "syscall"; "os") func main() { err := syscall.Fallocate(1, 1/*FALLOC_FL_KEEP_SIZE*/, 0, int64(40960)); fmt.Fprintln(os.Stderr, err) } Without this CL, ./test > testfile will show: file too large; and strace shows: fallocate(1, 01, 0, 175921860444160) = -1 EFBIG (File too large) With this CL, ./test > testfile will show: <nil>; and strace shows: fallocate(1, 01, 0, 40960) = 0 Quoting rsc: "[It turns out that] ARM syscall ABI requires 64-bit arguments to use an (even, odd) register pair, not an (odd, even) pair. Switching to "big-endian" worked because it ended up using the high 32-bits (always zero in the tests we had) as the padding word, because the 64-bit argument was the last one, and because we fill in zeros for the rest of the system call arguments, up to six. So it happened to work." I updated mksyscall_linux.pl to accommodate the register pair ABI requirement, and removed all hand-tweaked syscall routines in favor of the auto-generated ones. These including: Ftruncate, Truncate, Pread and Pwrite. Some recent Linux/ARM distributions do not bundle kernel asm headers, so instead we always get latest asm/unistd.h from git.kernel.org (just like what we do for FreeBSD). R=ken, r, rsc, r, dave, iant CC=golang-dev https://golang.org/cl/5726051 |
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