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>
This commit is contained in:
Florian Fainelli
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6bdb662deb
1 changed files with 139 additions and 0 deletions
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From f44f1e7da7c8e3f4575d5d61c4df978496903fcc Mon Sep 17 00:00:00 2001
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From: Florian Fainelli <f.fainelli@gmail.com>
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Date: Tue, 23 May 2017 17:32:31 -0700
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Subject: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a
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[ Upstream commit f44f1e7da7c8e3f4575d5d61c4df978496903fcc ]
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Building a statically linked UML kernel on a Centos 6.9 host resulted in
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the following linking failure (GCC 4.4, glibc-2.12):
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/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
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In function `siglongjmp':
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(.text+0x8490): multiple definition of `longjmp'
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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:
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first defined here
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/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
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In function `sem_open':
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(.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
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`mkstemp'
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collect2: ld returned 1 exit status
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make[4]: *** [vmlinux] Error 1
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Adopt a solution similar to the one done for vmap where we define
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longjmp/setjmp to be kernel_longjmp/setjmp. In the process, make sure we
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do rename the functions in arch/x86/um/setjmp_*.S accordingly.
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Fixes: a7df4716d195 ("um: link with -lpthread")
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Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Richard Weinberger <richard@nod.at>
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---
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arch/um/Makefile | 4 ++++
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arch/x86/um/setjmp_32.S | 16 ++++++++--------
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arch/x86/um/setjmp_64.S | 16 ++++++++--------
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3 files changed, 20 insertions(+), 16 deletions(-)
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diff --git a/arch/um/Makefile b/arch/um/Makefile
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index 0ca46ededfc7..6ca4f66085c1 100644
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--- a/arch/um/Makefile
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+++ b/arch/um/Makefile
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@@ -59,10 +59,14 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
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# Same things for in6addr_loopback and mktime - found in libc. For these two we
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# only get link-time error, luckily.
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#
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+# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
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+# embedded copy of longjmp, same thing for setjmp.
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+#
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# These apply to USER_CFLAGS to.
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KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
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+ -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
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-Din6addr_loopback=kernel_in6addr_loopback \
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-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
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diff --git a/arch/x86/um/setjmp_32.S b/arch/x86/um/setjmp_32.S
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index b766792c9933..39053192918d 100644
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--- a/arch/x86/um/setjmp_32.S
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+++ b/arch/x86/um/setjmp_32.S
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@@ -16,9 +16,9 @@
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.text
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.align 4
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- .globl setjmp
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- .type setjmp, @function
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-setjmp:
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+ .globl kernel_setjmp
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+ .type kernel_setjmp, @function
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+kernel_setjmp:
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#ifdef _REGPARM
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movl %eax,%edx
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#else
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@@ -35,13 +35,13 @@ setjmp:
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movl %ecx,20(%edx) # Return address
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ret
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- .size setjmp,.-setjmp
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+ .size kernel_setjmp,.-kernel_setjmp
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.text
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.align 4
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- .globl longjmp
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- .type longjmp, @function
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-longjmp:
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+ .globl kernel_longjmp
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+ .type kernel_longjmp, @function
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+kernel_longjmp:
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#ifdef _REGPARM
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xchgl %eax,%edx
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#else
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@@ -55,4 +55,4 @@ longjmp:
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movl 16(%edx),%edi
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jmp *20(%edx)
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- .size longjmp,.-longjmp
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+ .size kernel_longjmp,.-kernel_longjmp
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diff --git a/arch/x86/um/setjmp_64.S b/arch/x86/um/setjmp_64.S
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index 45f547b4043e..c56942e1a38c 100644
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--- a/arch/x86/um/setjmp_64.S
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+++ b/arch/x86/um/setjmp_64.S
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@@ -18,9 +18,9 @@
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.text
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.align 4
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- .globl setjmp
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- .type setjmp, @function
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-setjmp:
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+ .globl kernel_setjmp
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+ .type kernel_setjmp, @function
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+kernel_setjmp:
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pop %rsi # Return address, and adjust the stack
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xorl %eax,%eax # Return value
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movq %rbx,(%rdi)
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@@ -34,13 +34,13 @@ setjmp:
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movq %rsi,56(%rdi) # Return address
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ret
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- .size setjmp,.-setjmp
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+ .size kernel_setjmp,.-kernel_setjmp
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.text
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.align 4
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- .globl longjmp
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- .type longjmp, @function
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-longjmp:
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+ .globl kernel_longjmp
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+ .type kernel_longjmp, @function
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+kernel_longjmp:
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movl %esi,%eax # Return value (int)
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movq (%rdi),%rbx
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movq 8(%rdi),%rsp
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@@ -51,4 +51,4 @@ longjmp:
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movq 48(%rdi),%r15
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jmp *56(%rdi)
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- .size longjmp,.-longjmp
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+ .size kernel_longjmp,.-kernel_longjmp
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--
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2.13.0
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