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runtime/cgo: linux/arm64 cgo support
Change-Id: I309e3df7608b9eef9339196fdc50dedf5f9439f2 Reviewed-on: https://go-review.googlesource.com/8439 Reviewed-by: David Crawshaw <crawshaw@golang.org> Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
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Shenghou Ma
Minux Ma
parent
6e3a2a3f9f
commit
0accc80fbb
57
src/runtime/cgo/asm_arm64.s
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57
src/runtime/cgo/asm_arm64.s
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@ -0,0 +1,57 @@
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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/*
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* void crosscall2(void (*fn)(void*, int32), void*, int32)
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* Save registers and call fn with two arguments.
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*/
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TEXT crosscall2(SB),NOSPLIT,$-8
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/*
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* We still need to save all callee save register as before, and then
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* push 2 args for fn (R1 and R2).
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* Also note that at procedure entry in 7g world, 8(RSP) will be the
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* first arg.
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* TODO(minux): use LDP/STP here if it matters.
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*/
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SUB $128, RSP
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MOVD R1, (8*1)(RSP)
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MOVD R2, (8*2)(RSP)
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MOVD R19, (8*3)(RSP)
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MOVD R20, (8*4)(RSP)
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MOVD R21, (8*5)(RSP)
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MOVD R22, (8*6)(RSP)
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MOVD R23, (8*7)(RSP)
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MOVD R24, (8*8)(RSP)
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MOVD R25, (8*9)(RSP)
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MOVD R26, (8*10)(RSP)
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MOVD R27, (8*11)(RSP)
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MOVD g, (8*12)(RSP)
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MOVD R29, (8*13)(RSP)
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MOVD R30, (8*14)(RSP)
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MOVD R0, R19
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// Initialize Go ABI environment
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BL runtime·reginit(SB)
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BL runtime·load_g(SB)
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BL (R19)
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MOVD (8*1)(RSP), R1
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MOVD (8*2)(RSP), R2
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MOVD (8*3)(RSP), R19
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MOVD (8*4)(RSP), R20
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MOVD (8*5)(RSP), R21
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MOVD (8*6)(RSP), R22
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MOVD (8*7)(RSP), R23
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MOVD (8*8)(RSP), R24
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MOVD (8*9)(RSP), R25
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MOVD (8*10)(RSP), R26
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MOVD (8*11)(RSP), R27
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MOVD (8*12)(RSP), g
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MOVD (8*13)(RSP), R29
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MOVD (8*14)(RSP), R30
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ADD $128, RSP
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RET
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53
src/runtime/cgo/gcc_arm64.S
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53
src/runtime/cgo/gcc_arm64.S
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@ -0,0 +1,53 @@
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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* Apple still insists on underscore prefixes for C function names.
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*/
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#if defined(__APPLE__)
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#define EXT(s) _##s
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#else
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#define EXT(s) s
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#endif
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/*
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* void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
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*
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* Calling into the 7g tool chain, where all registers are caller save.
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* Called from standard ARM EABI, where x19-x29 are callee-save, so they
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* must be saved explicitly, along with x30 (LR).
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*/
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.globl EXT(crosscall1)
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EXT(crosscall1):
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stp x19, x20, [sp, #-16]!
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stp x21, x22, [sp, #-16]!
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stp x23, x24, [sp, #-16]!
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stp x25, x26, [sp, #-16]!
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stp x27, x28, [sp, #-16]!
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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mov x19, x0
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mov x20, x1
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mov x0, x2
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blr x20
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blr x19
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ldp x29, x30, [sp], #16
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ldp x27, x28, [sp], #16
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ldp x25, x26, [sp], #16
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ldp x23, x24, [sp], #16
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ldp x21, x22, [sp], #16
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ldp x19, x20, [sp], #16
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ret
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.globl EXT(__stack_chk_fail_local)
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EXT(__stack_chk_fail_local):
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1:
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b 1b
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#ifdef __ELF__
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.section .note.GNU-stack,"",%progbits
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#endif
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73
src/runtime/cgo/gcc_linux_arm64.c
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73
src/runtime/cgo/gcc_linux_arm64.c
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@ -0,0 +1,73 @@
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include <pthread.h>
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#include <string.h>
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#include <signal.h>
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#include "libcgo.h"
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static void *threadentry(void*);
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void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
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void (*setg_gcc)(void*);
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void
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_cgo_sys_thread_start(ThreadStart *ts)
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{
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pthread_attr_t attr;
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sigset_t ign, oset;
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pthread_t p;
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size_t size;
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int err;
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sigfillset(&ign);
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pthread_sigmask(SIG_SETMASK, &ign, &oset);
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// Not sure why the memset is necessary here,
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// but without it, we get a bogus stack size
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// out of pthread_attr_getstacksize. C'est la Linux.
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memset(&attr, 0, sizeof attr);
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pthread_attr_init(&attr);
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size = 0;
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pthread_attr_getstacksize(&attr, &size);
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// Leave stacklo=0 and set stackhi=size; mstack will do the rest.
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ts->g->stackhi = size;
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err = pthread_create(&p, &attr, threadentry, ts);
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pthread_sigmask(SIG_SETMASK, &oset, nil);
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if (err != 0) {
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fatalf("pthread_create failed: %s", strerror(err));
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}
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}
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extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
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static void*
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threadentry(void *v)
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{
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ThreadStart ts;
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ts = *(ThreadStart*)v;
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free(v);
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crosscall1(ts.fn, setg_gcc, (void*)ts.g);
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return nil;
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}
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void
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x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
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{
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pthread_attr_t attr;
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size_t size;
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setg_gcc = setg;
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pthread_attr_init(&attr);
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pthread_attr_getstacksize(&attr, &size);
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g->stacklo = (uintptr)&attr - size + 4096;
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pthread_attr_destroy(&attr);
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if (x_cgo_inittls) {
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x_cgo_inittls(tlsg, tlsbase);
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}
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}
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