mirror of
https://github.com/syncthing/syncthing-android.git
synced 2024-12-28 22:01:31 +00:00
267 lines
7.5 KiB
Diff
267 lines
7.5 KiB
Diff
From df553e646c597ab7fb26e3ffa2b730c04ab069f8 Mon Sep 17 00:00:00 2001
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From: Hyang-Ah Hana Kim <hyangah@gmail.com>
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Date: Thu, 5 Nov 2015 16:32:27 -0500
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Subject: [PATCH 1/4] cmd,runtime: TLS setup for android/386
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Same ugly hack as https://go-review.googlesource.com/15991.
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Update golang/go#9327.
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Change-Id: I58284e83268a15de95eabc833c3e01bf1e3faa2e
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---
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src/cmd/internal/obj/x86/asm6.go | 3 ++
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src/cmd/link/internal/ld/sym.go | 15 +++++--
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src/runtime/cgo/gcc_android_386.c | 87 +++++++++++++++++++++++++++++++++++++++
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src/runtime/cgo/gcc_linux_386.c | 12 ++++++
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src/runtime/rt0_android_386.s | 39 ++++++++++++++++++
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src/runtime/sys_linux_386.s | 10 +++++
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6 files changed, 162 insertions(+), 4 deletions(-)
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create mode 100644 src/runtime/cgo/gcc_android_386.c
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create mode 100644 src/runtime/rt0_android_386.s
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diff --git a/src/cmd/internal/obj/x86/asm6.go b/src/cmd/internal/obj/x86/asm6.go
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index 919e00b..13ab240 100644
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--- a/src/cmd/internal/obj/x86/asm6.go
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+++ b/src/cmd/internal/obj/x86/asm6.go
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@@ -1975,6 +1975,9 @@ func prefixof(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) int {
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if p.Mode == 32 {
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switch ctxt.Headtype {
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default:
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+ if isAndroid {
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+ return 0x65 // GS
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+ }
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log.Fatalf("unknown TLS base register for %s", obj.Headstr(ctxt.Headtype))
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case obj.Hdarwin,
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diff --git a/src/cmd/link/internal/ld/sym.go b/src/cmd/link/internal/ld/sym.go
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index da5776d..d91f138 100644
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--- a/src/cmd/link/internal/ld/sym.go
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+++ b/src/cmd/link/internal/ld/sym.go
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@@ -102,10 +102,17 @@ func linknew(arch *LinkArch) *Link {
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obj.Hopenbsd,
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obj.Hdragonfly,
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obj.Hsolaris:
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- if obj.Getgoos() == "android" && ctxt.Arch.Thechar == '6' {
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- // Android/x86 constant - offset from 0(FS) to our
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- // TLS slot. Explained in src/runtime/cgo/gcc_android_*.c
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- ctxt.Tlsoffset = 0x1d0
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+ if obj.Getgoos() == "android" {
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+ switch ctxt.Arch.Thechar {
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+ case '6':
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+ // Android/x86 constant - offset from 0(FS) to our
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+ // TLS slot. Explained in src/runtime/cgo/gcc_android_*.c
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+ ctxt.Tlsoffset = 0x1d0
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+ case '8':
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+ ctxt.Tlsoffset = 0xf8
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+ default:
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+ ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize
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+ }
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} else {
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ctxt.Tlsoffset = -1 * ctxt.Arch.Ptrsize
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}
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diff --git a/src/runtime/cgo/gcc_android_386.c b/src/runtime/cgo/gcc_android_386.c
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new file mode 100644
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index 0000000..a82d7d0
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--- /dev/null
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+++ b/src/runtime/cgo/gcc_android_386.c
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@@ -0,0 +1,87 @@
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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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+#include <string.h> /* for strerror */
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+#include <pthread.h>
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+#include <signal.h>
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+#include "libcgo.h"
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+
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+static void* threadentry(void*);
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+static pthread_key_t k1;
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+
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+#define magic1 (0x23581321U)
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+
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+static void
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+inittls(void)
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+{
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+ uint32 x;
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+ pthread_key_t tofree[128], k;
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+ int i, ntofree;
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+
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+ /*
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+ * Same logic, code as gcc_android_amd64.c:/inittls.
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+ * Note that this is a temporary hack that should be fixed soon.
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+ *
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+ * TODO: fix this.
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+ *
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+ * The linker and runtime hard-code this constant offset
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+ * from %gs where we expect to find g. Disgusting.
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+ *
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+ * Known to src/cmd/link/internal/ld/sym.go:/0xf8
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+ * and to src/runtime/sys_linux_386.s:/0xf8 or /GOOS_android.
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+ * TODO(hyangah): check 0xb0 works with API23+
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+ *
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+ * As disgusting as on the darwin/386, darwin/amd64.
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+ */
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+ ntofree = 0;
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+ for(;;) {
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+ if(pthread_key_create(&k, nil) < 0) {
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+ fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
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+ abort();
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+ }
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+ pthread_setspecific(k, (void*)magic1);
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+ asm volatile("movl %%gs:0xf8, %0" : "=r"(x));
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+ pthread_setspecific(k, 0);
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+ if (x == magic1) {
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+ k1 = k;
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+ break;
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+ }
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+ if(ntofree >= nelem(tofree)) {
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+ fprintf(stderr, "runtime/cgo: could not obtain pthread_keys\n");
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+ fprintf(stderr, "\ttried");
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+ for(i=0; i<ntofree; i++)
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+ fprintf(stderr, " %#x", (unsigned)tofree[i]);
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+ fprintf(stderr, "\n");
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+ abort();
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+ }
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+ tofree[ntofree++] = k;
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+ }
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+ // TODO: output to stderr is not useful for apps.
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+ // Can we fall back to Android's log library?
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+
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+ /*
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+ * We got the key we wanted. Free the others.
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+ */
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+ for(i=0; i<ntofree; i++) {
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+ pthread_key_delete(tofree[i]);
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+ }
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+}
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+
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+
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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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+
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+ ts = *(ThreadStart*)v;
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+ free(v);
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+
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+ pthread_setspecific(k1, (void*)ts.g);
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+
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+ crosscall_386(ts.fn);
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+ return nil;
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+}
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+
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+void (*x_cgo_inittls)(void) = inittls;
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+void* (*x_cgo_threadentry)(void*) = threadentry;
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diff --git a/src/runtime/cgo/gcc_linux_386.c b/src/runtime/cgo/gcc_linux_386.c
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index 9801c87..8fb7130 100644
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--- a/src/runtime/cgo/gcc_linux_386.c
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+++ b/src/runtime/cgo/gcc_linux_386.c
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@@ -10,6 +10,10 @@
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static void *threadentry(void*);
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static void (*setg_gcc)(void*);
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+// These will be set in gcc_android_386.c for android-specific customization.
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+void (*x_cgo_inittls)(void);
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+void* (*x_cgo_threadentry)(void*);
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+
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void
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x_cgo_init(G *g, void (*setg)(void*))
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{
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@@ -21,6 +25,10 @@ x_cgo_init(G *g, void (*setg)(void*))
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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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+
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+ if (x_cgo_inittls) {
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+ x_cgo_inittls();
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+ }
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}
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@@ -57,6 +65,10 @@ _cgo_sys_thread_start(ThreadStart *ts)
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static void*
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threadentry(void *v)
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{
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+ if (x_cgo_threadentry) {
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+ return x_cgo_threadentry(v);
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+ }
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+
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ThreadStart ts;
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ts = *(ThreadStart*)v;
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diff --git a/src/runtime/rt0_android_386.s b/src/runtime/rt0_android_386.s
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new file mode 100644
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index 0000000..bf44af3
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--- /dev/null
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+++ b/src/runtime/rt0_android_386.s
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@@ -0,0 +1,39 @@
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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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+#include "textflag.h"
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+
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+TEXT _rt0_386_android(SB),NOSPLIT,$8
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+ MOVL 8(SP), AX // argc
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+ LEAL 12(SP), BX // argv
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+ MOVL AX, 0(SP)
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+ MOVL BX, 4(SP)
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+ CALL main(SB)
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+ INT $3
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+
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+TEXT _rt0_386_android_lib(SB),NOSPLIT,$0
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+ PUSHL $_rt0_386_android_argv(SB) // argv
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+ PUSHL $1 // argc
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+ CALL _rt0_386_linux_lib(SB)
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+ POPL AX
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+ POPL AX
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+ RET
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+
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+DATA _rt0_386_android_argv+0x00(SB)/4,$_rt0_386_android_argv0(SB)
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+DATA _rt0_386_android_argv+0x04(SB)/4,$0
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+DATA _rt0_386_android_argv+0x08(SB)/4,$0
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+DATA _rt0_386_android_argv+0x0c(SB)/4,$15 // AT_PLATFORM (auxvec.h)
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+DATA _rt0_386_android_argv+0x10(SB)/4,$_rt0_386_android_auxv0(SB)
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+DATA _rt0_386_android_argv+0x14(SB)/4,$0
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+DATA _rt0_386_android_argv+0x18(SB)/4,$0
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+DATA _rt0_386_android_argv+0x1c(SB)/4,$0
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+GLOBL _rt0_386_android_argv(SB),NOPTR,$0x20
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+
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+// TODO: AT_HWCAP necessary? If so, what value?
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+
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+DATA _rt0_386_android_argv0(SB)/8, $"gojni"
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+GLOBL _rt0_386_android_argv0(SB),RODATA,$8
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+
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+DATA _rt0_386_android_auxv0(SB)/8, $"i386"
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+GLOBL _rt0_386_android_auxv0(SB),RODATA,$8
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diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
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index 9e0e87c..a52c4b2 100644
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--- a/src/runtime/sys_linux_386.s
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+++ b/src/runtime/sys_linux_386.s
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@@ -405,6 +405,15 @@ TEXT runtime·setldt(SB),NOSPLIT,$32
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MOVL entry+0(FP), BX // entry
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MOVL address+4(FP), CX // base address
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+#ifdef GOOS_android
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+ /*
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+ * Same as in sys_darwin_386.s:/ugliness, different constant.
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+ * address currently holds m->tls, which must be %gs:0xf8.
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+ * See cgo/gcc_android_386.c for the derivation of the constant.
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+ */
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+ SUBL $0xf8, CX
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+ MOVL CX, 0(CX)
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+#else
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/*
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* When linking against the system libraries,
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* we use its pthread_create and let it set up %gs
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@@ -420,6 +429,7 @@ TEXT runtime·setldt(SB),NOSPLIT,$32
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*/
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ADDL $0x4, CX // address
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MOVL CX, 0(CX)
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+#endif
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// set up user_desc
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LEAL 16(SP), AX // struct user_desc
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--
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2.5.2
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