Fix the golang demo's failure to run

tools/toolchains/golang/adapt-golang-to-occlum.patch

@@ -1,7 +1,7 @@
 From 4c7e5586d109eba46c4f067699ae652d722270a0 Mon Sep 17 00:00:00 2001
 From: "jeffery.wsj" <jeffery.wsj@alibaba-inc.com>
 Date: Fri, 8 May 2020 18:06:37 +0800
-Subject: [PATCH] adapt golang to occlum libos:
+Subject: [PATCH 1/2] adapt golang to occlum libos:
 
 1. hook heap malloc
 2. hook all syscall based on amd64 linux platform
@@ -633,5 +633,88 @@ index 364815df18..4417768e8a 100644
  	JLS	ok7
  	NEGQ	AX
 -- 
-2.19.1.3.ge56e4f7
+2.17.1
+
+
+From 4e78cdfbfbe4382a4dc9f2d4d7048f3c20bb1d74 Mon Sep 17 00:00:00 2001
+From: "jeffery.wsj" <jeffery.wsj@alibaba-inc.com>
+Date: Fri, 8 May 2020 18:06:37 +0800
+Subject: [PATCH 2/2] refactor syscall ABI for occlum 0.15.0
+
+---
+ src/runtime/sys_linux_amd64.s |  4 ++--
+ src/runtime/textflag.h        | 23 +++++++++++++++--------
+ src/syscall/asm_linux_amd64.s |  2 +-
+ 3 files changed, 18 insertions(+), 11 deletions(-)
+
+diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
+index db9c9ab55b..6416170c41 100644
+--- a/src/runtime/sys_linux_amd64.s
++++ b/src/runtime/sys_linux_amd64.s
+@@ -187,7 +187,7 @@ TEXT runtime·walltime(SB),NOSPLIT,$0-12
+ 	MOVQ    $SYS_clock_gettime, AX
+ 	MOVQ    $0, DI
+ 	LEAQ    ret+0(SP), SI
+-	CALL    *runtime·occlumentry(SB)
++	OCCLUM_SYSCALL
+ 	MOVQ    0(SP), AX
+ 	MOVQ    8(SP), DX
+ 	MOVQ    BP, SP
+@@ -261,7 +261,7 @@ TEXT runtime·nanotime(SB),NOSPLIT,$0-8
+ 	MOVQ    $SYS_clock_gettime, AX
+ 	MOVQ    $1, DI
+ 	LEAQ    ret+0(SP), SI
+-	CALL    *runtime·occlumentry(SB)
++	OCCLUM_SYSCALL
+ 	MOVQ    0(SP), AX       // sec
+ 	MOVQ    8(SP), DX       // nsec
+ 	IMULQ   $1000000000, AX
+diff --git a/src/runtime/textflag.h b/src/runtime/textflag.h
+index 824f069076..e51f98849a 100644
+--- a/src/runtime/textflag.h
++++ b/src/runtime/textflag.h
+@@ -36,13 +36,20 @@
+ // at this function.
+ #define TOPFRAME 2048
+ 
+-#define SYSCALL_ENHANCE  \
+-    CMPQ runtime·occlumentry(SB), $0x0    \
+-    JBE  4(PC)                            \
+-    CALL *runtime·occlumentry(SB)         \
+-    CMPQ runtime·occlumentry(SB), $0x0    \
+-    JNE  2(PC)                            \
++// refactor syscall ABI according to occlum v0.15.0.
++// step one: assign syscall return address to register rcx, occlum know where
++//           should return according to rcx.
++// step two: jump to syscall interface address provided by occlum when go
++//           .bin file loaded.
++// <BYTE $0x48; BYTE $0x8d; BYTE $0x0d; BYTE $0x0c; BYTE $0x00; BYTE $0x00; BYTE $0x00>
++// actually is the assembler instruction: lea 0xc(%rip),%rcx
++#define OCCLUM_SYSCALL                \
++    BYTE $0x48; BYTE $0x8d; BYTE $0x0d; BYTE $0x0c; BYTE $0x00; BYTE $0x00; BYTE $0x00    \
++    MOVQ runtime·occlumentry(SB), R11          \
++    JMP  R11                                   \
+     SYSCALL
+ 
+-#define OCCLUM_GET_TIME_OF_DAY   \
+-    CALL *runtime·occlumentry(SB)
++#define SYSCALL_ENHANCE  \
++    CMPQ runtime·occlumentry(SB), $0x0          \
++    JBE  10(PC)                                 \
++    OCCLUM_SYSCALL
+diff --git a/src/syscall/asm_linux_amd64.s b/src/syscall/asm_linux_amd64.s
+index 4417768e8a..06f2eb09c0 100644
+--- a/src/syscall/asm_linux_amd64.s
++++ b/src/syscall/asm_linux_amd64.s
+@@ -157,7 +157,7 @@ TEXT ·gettimeofday(SB),NOSPLIT,$0-16
+ 	MOVQ    tv+0(FP), DI
+ 	MOVQ    $0, SI
+ 	MOVQ    $SYS_gettimeofday, AX
+-	OCCLUM_GET_TIME_OF_DAY
++	OCCLUM_SYSCALL
+ 	JMP     result
+ 
+ start:
+-- 
+2.17.1
 

tools/toolchains/golang/build.sh

@@ -19,7 +19,7 @@ git clone https://github.com/golang/go .
 # Swtich to Golang 1.13.7
 git checkout -b go1.13.7 tags/go1.13.7
 # Apply the patch to adapt Golang to Occlum
-git apply ${THIS_DIR}/0001-adapt-golang-to-occlum-libos.patch
+git apply ${THIS_DIR}/adapt-golang-to-occlum.patch
 
 # Build Golang
 cd src