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| author | Jordan Rhee <jordanrh@microsoft.com> | 2018-08-08 14:44:42 -0700 |
|---|---|---|
| committer | Ian Lance Taylor <iant@golang.org> | 2018-09-18 22:18:23 +0000 |
| commit | d24ec86e4f64302e91d8062eabfcd21296bb9b04 (patch) | |
| tree | 93618b9bd00376df7529db6c4fd8785a91dcc41f /src/runtime/tls_arm.s | |
| parent | 37db664c6cd480b578d6114854bc20c2bc3cddcd (diff) | |
| download | go-d24ec86e4f64302e91d8062eabfcd21296bb9b04.tar.gz go-d24ec86e4f64302e91d8062eabfcd21296bb9b04.zip | |
runtime: support windows/arm
Updates #26148
Change-Id: I8f68b2c926c7b11dc86c9664ed7ff2d2f78b64b4
Reviewed-on: https://go-review.googlesource.com/128715
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Diffstat (limited to 'src/runtime/tls_arm.s')
| -rw-r--r-- | src/runtime/tls_arm.s | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/src/runtime/tls_arm.s b/src/runtime/tls_arm.s index cc547a5db1..e2c945d183 100644 --- a/src/runtime/tls_arm.s +++ b/src/runtime/tls_arm.s @@ -23,6 +23,9 @@ #ifdef GOOS_darwin #define TLSG_IS_VARIABLE #endif +#ifdef GOOS_windows +#define TLSG_IS_VARIABLE +#endif // save_g saves the g register into pthread-provided // thread-local memory, so that we can call externally compiled @@ -36,6 +39,17 @@ TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0 MOVW g, R0 // preserve R0 across call to setg<> RET #else +#ifdef GOOS_windows + // Save the value in the _TEB->TlsSlots array. + // Effectively implements TlsSetValue(). + MRC 15, 0, R0, C13, C0, 2 + ADD $0xe10, R0 + MOVW $runtime·tls_g(SB), R11 + MOVW (R11), R11 + MOVW g, R11<<2(R0) + MOVW g, R0 // preserve R0 accross call to setg<> + RET +#else // If the host does not support MRC the linker will replace it with // a call to runtime.read_tls_fallback which jumps to __kuser_get_tls. // The replacement function saves LR in R11 over the call to read_tls_fallback. @@ -47,6 +61,7 @@ TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0 MOVW g, R0 // preserve R0 across call to setg<> RET #endif +#endif // load_g loads the g register from pthread-provided // thread-local memory, for use after calling externally compiled @@ -56,6 +71,16 @@ TEXT runtime·load_g(SB),NOSPLIT,$0 // nothing to do as nacl/arm does not use TLS at all. RET #else +#ifdef GOOS_windows + // Get the value from the _TEB->TlsSlots array. + // Effectively implements TlsGetValue(). + MRC 15, 0, R0, C13, C0, 2 + ADD $0xe10, R0 + MOVW $runtime·tls_g(SB), g + MOVW (g), g + MOVW g<<2(R0), g + RET +#else // See save_g MRC 15, 0, R0, C13, C0, 3 // fetch TLS base pointer BIC $3, R0 // Darwin/ARM might return unaligned pointer @@ -64,6 +89,7 @@ TEXT runtime·load_g(SB),NOSPLIT,$0 MOVW 0(R0), g RET #endif +#endif // This is called from rt0_go, which runs on the system stack // using the initial stack allocated by the OS. @@ -76,6 +102,20 @@ TEXT runtime·load_g(SB),NOSPLIT,$0 // Declare a dummy word ($4, not $0) to make sure the // frame is 8 bytes and stays 8-byte-aligned. TEXT runtime·_initcgo(SB),NOSPLIT,$4 +#ifdef GOOS_windows + MOVW R13, R4 + BIC $0x7, R13 + MOVW $runtime·_TlsAlloc(SB), R0 + MOVW (R0), R0 + BL (R0) + // Assert that slot is less than 64 so we can use _TEB->TlsSlots + CMP $64, R0 + MOVW $runtime·abort(SB), R1 + BL.GE (R1) + MOVW $runtime·tls_g(SB), R1 + MOVW R0, (R1) + MOVW R4, R13 +#else #ifndef GOOS_nacl // if there is an _cgo_init, call it. MOVW _cgo_init(SB), R4 @@ -91,7 +131,8 @@ TEXT runtime·_initcgo(SB),NOSPLIT,$4 MOVW $setg_gcc<>(SB), R1 // arg 1: setg MOVW g, R0 // arg 0: G BL (R4) // will clobber R0-R3 -#endif +#endif // GOOS_nacl +#endif // GOOS_windows nocgo: RET |