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authorFlorian Fainelli <f.fainelli@gmail.com>2017-07-18 14:52:51 -0700
committerFlorian Fainelli <f.fainelli@gmail.com>2017-07-18 14:52:51 -0700
commit6bdb662debf804d1c5049b7cdddc30591e42a1e1 (patch)
tree8e4d10fdc3d250cd714aa8aeb7d918707f613d6b /target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch
parent8647f4f018e4dee663b65948d75105fae7bb3cdc (diff)
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uml: Backport upstream fix to build against static libpthread
Backport upstream commit f44f1e7da7c8e3f4575d5d61c4df978496903fcc ("um: Avoid longjmp/setjmp symbol clashes with libpthread.a") to fix build issues on hosts that only have a static libpthread. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch')
-rw-r--r--target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch139
1 files changed, 139 insertions, 0 deletions
diff --git a/target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch b/target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch
new file mode 100644
index 0000000000..45b14df411
--- /dev/null
+++ b/target/linux/uml/patches-4.4/000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch
@@ -0,0 +1,139 @@
+From f44f1e7da7c8e3f4575d5d61c4df978496903fcc Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <f.fainelli@gmail.com>
+Date: Tue, 23 May 2017 17:32:31 -0700
+Subject: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a
+
+[ Upstream commit f44f1e7da7c8e3f4575d5d61c4df978496903fcc ]
+
+Building a statically linked UML kernel on a Centos 6.9 host resulted in
+the following linking failure (GCC 4.4, glibc-2.12):
+
+/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
+In function `siglongjmp':
+(.text+0x8490): multiple definition of `longjmp'
+arch/x86/um/built-in.o:/local/users/fainelli/openwrt/trunk/build_dir/target-x86_64_musl/linux-uml/linux-4.4.69/arch/x86/um/setjmp_64.S:44:
+first defined here
+/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
+In function `sem_open':
+(.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
+`mkstemp'
+collect2: ld returned 1 exit status
+make[4]: *** [vmlinux] Error 1
+
+Adopt a solution similar to the one done for vmap where we define
+longjmp/setjmp to be kernel_longjmp/setjmp. In the process, make sure we
+do rename the functions in arch/x86/um/setjmp_*.S accordingly.
+
+Fixes: a7df4716d195 ("um: link with -lpthread")
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+Signed-off-by: Richard Weinberger <richard@nod.at>
+---
+ arch/um/Makefile | 4 ++++
+ arch/x86/um/setjmp_32.S | 16 ++++++++--------
+ arch/x86/um/setjmp_64.S | 16 ++++++++--------
+ 3 files changed, 20 insertions(+), 16 deletions(-)
+
+diff --git a/arch/um/Makefile b/arch/um/Makefile
+index 0ca46ededfc7..6ca4f66085c1 100644
+--- a/arch/um/Makefile
++++ b/arch/um/Makefile
+@@ -59,10 +59,14 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
+ # Same things for in6addr_loopback and mktime - found in libc. For these two we
+ # only get link-time error, luckily.
+ #
++# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
++# embedded copy of longjmp, same thing for setjmp.
++#
+ # These apply to USER_CFLAGS to.
+
+ KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
++ -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
+ -Din6addr_loopback=kernel_in6addr_loopback \
+ -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
+
+diff --git a/arch/x86/um/setjmp_32.S b/arch/x86/um/setjmp_32.S
+index b766792c9933..39053192918d 100644
+--- a/arch/x86/um/setjmp_32.S
++++ b/arch/x86/um/setjmp_32.S
+@@ -16,9 +16,9 @@
+
+ .text
+ .align 4
+- .globl setjmp
+- .type setjmp, @function
+-setjmp:
++ .globl kernel_setjmp
++ .type kernel_setjmp, @function
++kernel_setjmp:
+ #ifdef _REGPARM
+ movl %eax,%edx
+ #else
+@@ -35,13 +35,13 @@ setjmp:
+ movl %ecx,20(%edx) # Return address
+ ret
+
+- .size setjmp,.-setjmp
++ .size kernel_setjmp,.-kernel_setjmp
+
+ .text
+ .align 4
+- .globl longjmp
+- .type longjmp, @function
+-longjmp:
++ .globl kernel_longjmp
++ .type kernel_longjmp, @function
++kernel_longjmp:
+ #ifdef _REGPARM
+ xchgl %eax,%edx
+ #else
+@@ -55,4 +55,4 @@ longjmp:
+ movl 16(%edx),%edi
+ jmp *20(%edx)
+
+- .size longjmp,.-longjmp
++ .size kernel_longjmp,.-kernel_longjmp
+diff --git a/arch/x86/um/setjmp_64.S b/arch/x86/um/setjmp_64.S
+index 45f547b4043e..c56942e1a38c 100644
+--- a/arch/x86/um/setjmp_64.S
++++ b/arch/x86/um/setjmp_64.S
+@@ -18,9 +18,9 @@
+
+ .text
+ .align 4
+- .globl setjmp
+- .type setjmp, @function
+-setjmp:
++ .globl kernel_setjmp
++ .type kernel_setjmp, @function
++kernel_setjmp:
+ pop %rsi # Return address, and adjust the stack
+ xorl %eax,%eax # Return value
+ movq %rbx,(%rdi)
+@@ -34,13 +34,13 @@ setjmp:
+ movq %rsi,56(%rdi) # Return address
+ ret
+
+- .size setjmp,.-setjmp
++ .size kernel_setjmp,.-kernel_setjmp
+
+ .text
+ .align 4
+- .globl longjmp
+- .type longjmp, @function
+-longjmp:
++ .globl kernel_longjmp
++ .type kernel_longjmp, @function
++kernel_longjmp:
+ movl %esi,%eax # Return value (int)
+ movq (%rdi),%rbx
+ movq 8(%rdi),%rsp
+@@ -51,4 +51,4 @@ longjmp:
+ movq 48(%rdi),%r15
+ jmp *56(%rdi)
+
+- .size longjmp,.-longjmp
++ .size kernel_longjmp,.-kernel_longjmp
+--
+2.13.0
+