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| 1 // Copyright 2014 The Go Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style | |
| 3 // license that can be found in the LICENSE file. | |
| 4 | |
| 5 // +build !android | |
| 6 | |
| 7 #include "zasm_GOOS_GOARCH.h" | |
| 8 #include "funcdata.h" | |
| 9 #include "../../cmd/ld/textflag.h" | |
| 10 | |
| 11 // We have to resort to TLS variable to save g(R10) and | |
| 12 // m(R9). One reason is that external code might trigger | |
|
minux
2014/07/02 04:21:15
there is no m(R9) anymore. sync your client with t
crawshaw
2014/07/02 14:57:22
Done.
| |
| 13 // SIGSEGV, and our runtime.sigtramp don't even know we | |
| 14 // are in external code, and will continue to use R10/R9, | |
| 15 // this might as well result in another SIGSEGV. | |
| 16 // Note: all three functions will clobber R0, and the last | |
| 17 // two can be called from 5c ABI code. | |
| 18 | |
| 19 // save_g saves the g register into pthread-provided | |
| 20 // thread-local memory, so that we can call externally compiled | |
| 21 // ARM code that will overwrite those registers. | |
| 22 // NOTE: runtime.gogo assumes that R1 is preserved by this function. | |
| 23 // runtime.mcall assumes this function only clobbers R0 and R11. | |
|
minux
2014/07/02 04:21:14
this comment is fairly important, so I strongly su
crawshaw
2014/07/02 14:57:22
Done.
| |
| 24 TEXT runtime·save_g(SB),NOSPLIT,$0 | |
| 25 MRC 15, 0, R0, C13, C0, 3 // fetch TLS base pointer | |
| 26 // $runtime.tlsg(SB) is a special linker symbol. | |
| 27 // It is the offset from the TLS base pointer to our | |
| 28 // thread-local storage for g. | |
| 29 MOVW $runtime·tlsg(SB), R11 | |
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minux
2014/07/02 04:21:15
the difference between this file and the other is
dave_cheney.net
2014/07/02 04:33:05
seconded, let's use an ifdef until that proves too
crawshaw
2014/07/02 14:57:22
Done.
| |
| 30 ADD R11, R0 | |
| 31 MOVW g, 0(R0) | |
| 32 RET | |
| 33 | |
| 34 // load_g loads the g register from pthread-provided | |
| 35 // thread-local memory, for use after calling externally compiled | |
| 36 // ARM code that overwrote those registers. | |
| 37 TEXT runtime·load_g(SB),NOSPLIT,$0 | |
| 38 MRC 15, 0, R0, C13, C0, 3 // fetch TLS base pointer | |
| 39 // $runtime.tlsg(SB) is a special linker symbol. | |
| 40 // It is the offset from the TLS base pointer to our | |
| 41 // thread-local storage for g. | |
| 42 MOVW $runtime·tlsg(SB), R11 | |
| 43 ADD R11, R0 | |
| 44 MOVW 0(R0), g | |
| 45 RET | |
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