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Dave Cheney d1b2913710 runtime/cgo: encode BLX directly, fixes one clang build error on arm
Fixes #8348.

Trying to work around clang's dodgy support for .arch by reverting to the external assembler didn't work out so well. Minux had a much better solution to encode the instructions we need as .word directives which avoids .arch altogether.

I've confirmed with gdb that this form produces the expected machine code

Dump of assembler code for function crosscall_arm1:
   0x00000000 <+0>:	push	{r4, r5, r6, r7, r8, r9, r10, r11, r12, lr}
   0x00000004 <+4>:	mov	r4, r0
   0x00000008 <+8>:	mov	r5, r1
   0x0000000c <+12>:	mov	r0, r2
   0x00000010 <+16>:	blx	r5
   0x00000014 <+20>:	blx	r4
   0x00000018 <+24>:	pop	{r4, r5, r6, r7, r8, r9, r10, r11, r12, pc}

There is another compilation failure that blocks building Go with clang on arm

# ../misc/cgo/test
# _/home/dfc/go/misc/cgo/test
/tmp/--407b12.s: Assembler messages:
/tmp/--407b12.s:59: Error: selected processor does not support ARM mode `blx r0'
clang: error: assembler command failed with exit code 1 (use -v to see invocation)
FAIL	_/home/dfc/go/misc/cgo/test [build failed]

I'll open a new issue for that

LGTM=iant
R=iant, minux
CC=golang-codereviews
https://golang.org/cl/158180047
2014-10-22 12:30:15 +11:00
api unicode: strconv: regexp: Upgrade to Unicode 7.0.0. 2014-08-18 20:26:10 +02:00
doc doc/go1.4.txt: add compress/* Reset note 2014-10-20 10:02:25 +02:00
include liblink: require DATA lines to be ordered by offset, with no overlap 2014-10-14 23:25:12 -04:00
lib codereview: do not hit upload_complete on first patch 2014-08-06 16:12:24 -04:00
misc misc/makerelease: set version number in Windows installer 2014-10-22 10:56:26 +11:00
src runtime/cgo: encode BLX directly, fixes one clang build error on arm 2014-10-22 12:30:15 +11:00
test cmd/gc: disallow call of *T method using **T variable 2014-10-20 22:04:12 -04:00
.hgignore .hgignore: delete some dregs 2014-09-25 17:30:12 -07:00
.hgtags tag go1.3.3 2014-10-01 13:38:00 +10:00
AUTHORS A+C: Ron Hashimoto (individual CLA) 2014-10-08 07:10:04 -07:00
CONTRIBUTORS CONTRIBUTORS: add James Robinson (Google CLA) 2014-10-17 16:39:42 +02:00
favicon.ico godoc: update favicon 2012-10-11 17:02:36 +11:00
LICENSE doc: update licensing text one more time 2012-03-27 15:09:13 +11:00
PATENTS LICENSE: separate, change PATENTS text 2010-12-06 16:31:59 -05:00
README README: Fix installation instructions 2013-11-20 13:47:37 -08:00
robots.txt godoc: serve robots.txt raw 2011-02-19 05:46:20 +11:00

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