wireguard-android/tunnel/tools/libwg-go/goruntime-boottime-over-monotonic.diff

From b19623e7673a4d6743745382d5d38751b64e011d Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Wed, 27 Feb 2019 05:05:44 +0100
Subject: [PATCH] runtime: use CLOCK_BOOTTIME in nanotime on Linux

This makes timers account for having expired while a computer was
asleep, which is quite common on mobile devices. Note that BOOTTIME is
identical to MONOTONIC, except that it takes into account time spent
in suspend. In Linux 4.17, the kernel will actually make MONOTONIC act
like BOOTTIME anyway, so this switch will additionally unify the
timer behavior across kernels.

BOOTTIME was introduced into Linux 2.6.39-rc1 with 70a08cca1227d in
2011.

Fixes #24595

Change-Id: I7b2a6ca0c5bc5fce57ec0eeafe7b68270b429321
---
 src/runtime/sys_linux_386.s     | 4 ++--
 src/runtime/sys_linux_amd64.s   | 2 +-
 src/runtime/sys_linux_arm.s     | 4 ++--
 src/runtime/sys_linux_arm64.s   | 4 ++--
 src/runtime/sys_linux_mips64x.s | 2 +-
 src/runtime/sys_linux_mipsx.s   | 2 +-
 src/runtime/sys_linux_ppc64x.s  | 2 +-
 src/runtime/sys_linux_s390x.s   | 2 +-
 8 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/src/runtime/sys_linux_386.s b/src/runtime/sys_linux_386.s
index 72c43bd9da..daadfe32a9 100644
--- a/src/runtime/sys_linux_386.s
+++ b/src/runtime/sys_linux_386.s
@@ -288,13 +288,13 @@ noswitch:
 
 	LEAL	8(SP), BX	// &ts (struct timespec)
 	MOVL	BX, 4(SP)
-	MOVL	$1, 0(SP)	// CLOCK_MONOTONIC
+	MOVL	$7, 0(SP)	// CLOCK_BOOTTIME
 	CALL	AX
 	JMP finish
 
 fallback:
 	MOVL	$SYS_clock_gettime, AX
-	MOVL	$1, BX		// CLOCK_MONOTONIC
+	MOVL	$7, BX		// CLOCK_BOOTTIME
 	LEAL	8(SP), CX
 	INVOKE_SYSCALL
 
diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
index 5c300f553d..e4a6f12ec6 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -261,7 +261,7 @@ noswitch:
 	MOVQ	runtime·vdsoClockgettimeSym(SB), AX
 	CMPQ	AX, $0
 	JEQ	fallback
-	MOVL	$1, DI // CLOCK_MONOTONIC
+	MOVL	$7, DI // CLOCK_BOOTTIME
 	LEAQ	0(SP), SI
 	CALL	AX
 	MOVQ	0(SP), AX	// sec
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s
index 9c7398451c..61b6cd91f6 100644
--- a/src/runtime/sys_linux_arm.s
+++ b/src/runtime/sys_linux_arm.s
@@ -11,7 +11,7 @@
 #include "textflag.h"
 
 #define CLOCK_REALTIME	0
-#define CLOCK_MONOTONIC	1
+#define CLOCK_BOOTTIME	7
 
 // for EABI, as we don't support OABI
 #define SYS_BASE 0x0
@@ -291,7 +291,7 @@ noswitch:
 	SUB	$24, R13	// Space for results
 	BIC	$0x7, R13	// Align for C code
 
-	MOVW	$CLOCK_MONOTONIC, R0
+	MOVW	$CLOCK_BOOTTIME, R0
 	MOVW	$8(R13), R1	// timespec
 	MOVW	runtime·vdsoClockgettimeSym(SB), R11
 	CMP	$0, R11
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index 2835b6ca1c..346ca9cfce 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -13,7 +13,7 @@
 #define AT_FDCWD -100
 
 #define CLOCK_REALTIME 0
-#define CLOCK_MONOTONIC 1
+#define CLOCK_BOOTTIME 7
 
 #define SYS_exit		93
 #define SYS_read		63
@@ -247,7 +247,7 @@ noswitch:
 	BIC	$15, R1
 	MOVD	R1, RSP
 
-	MOVW	$CLOCK_MONOTONIC, R0
+	MOVW	$CLOCK_BOOTTIME, R0
 	MOVD	runtime·vdsoClockgettimeSym(SB), R2
 	CBZ	R2, fallback
 	BL	(R2)
diff --git a/src/runtime/sys_linux_mips64x.s b/src/runtime/sys_linux_mips64x.s
index 33ed1050c2..59a5be179c 100644
--- a/src/runtime/sys_linux_mips64x.s
+++ b/src/runtime/sys_linux_mips64x.s
@@ -189,7 +189,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$16
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVW	$1, R4 // CLOCK_MONOTONIC
+	MOVW	$7, R4 // CLOCK_BOOTTIME
 	MOVV	$0(R29), R5
 	MOVV	$SYS_clock_gettime, R2
 	SYSCALL
diff --git a/src/runtime/sys_linux_mipsx.s b/src/runtime/sys_linux_mipsx.s
index 6e539fbc6f..55b2bf7156 100644
--- a/src/runtime/sys_linux_mipsx.s
+++ b/src/runtime/sys_linux_mipsx.s
@@ -194,7 +194,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$8-12
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$8-8
-	MOVW	$1, R4	// CLOCK_MONOTONIC
+	MOVW	$7, R4	// CLOCK_BOOTTIME
 	MOVW	$4(R29), R5
 	MOVW	$SYS_clock_gettime, R2
 	SYSCALL
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s
index 13d23156bd..f67e5062aa 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -204,7 +204,7 @@ fallback:
 	JMP	finish
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVD	$1, R3		// CLOCK_MONOTONIC
+	MOVD	$7, R3		// CLOCK_BOOTTIME
 
 	MOVD	R1, R15		// R15 is unchanged by C code
 	MOVD	g_m(g), R21	// R21 = m
diff --git a/src/runtime/sys_linux_s390x.s b/src/runtime/sys_linux_s390x.s
index 58b36dff0a..cb92e9a402 100644
--- a/src/runtime/sys_linux_s390x.s
+++ b/src/runtime/sys_linux_s390x.s
@@ -180,7 +180,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$16
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVW	$1, R2 // CLOCK_MONOTONIC
+	MOVW	$7, R2 // CLOCK_BOOTTIME
 	MOVD	$tp-16(SP), R3
 	MOVW	$SYS_clock_gettime, R1
 	SYSCALL
-- 
2.23.0