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[librecmc/librecmc.git] / target / linux / uml / patches-4.9 / 000-um-Avoid-longjmp-setjmp-symbol-clashes-with-libpthre.patch
1 From f44f1e7da7c8e3f4575d5d61c4df978496903fcc Mon Sep 17 00:00:00 2001
2 From: Florian Fainelli <f.fainelli@gmail.com>
3 Date: Tue, 23 May 2017 17:32:31 -0700
4 Subject: [PATCH] um: Avoid longjmp/setjmp symbol clashes with libpthread.a
5
6 [ Upstream commit f44f1e7da7c8e3f4575d5d61c4df978496903fcc ]
7
8 Building a statically linked UML kernel on a Centos 6.9 host resulted in
9 the following linking failure (GCC 4.4, glibc-2.12):
10
11 /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
12 In function `siglongjmp':
13 (.text+0x8490): multiple definition of `longjmp'
14 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:
15 first defined here
16 /usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o):
17 In function `sem_open':
18 (.text+0x77cd): warning: the use of `mktemp' is dangerous, better use
19 `mkstemp'
20 collect2: ld returned 1 exit status
21 make[4]: *** [vmlinux] Error 1
22
23 Adopt a solution similar to the one done for vmap where we define
24 longjmp/setjmp to be kernel_longjmp/setjmp. In the process, make sure we
25 do rename the functions in arch/x86/um/setjmp_*.S accordingly.
26
27 Fixes: a7df4716d195 ("um: link with -lpthread")
28 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
29 Signed-off-by: Richard Weinberger <richard@nod.at>
30 ---
31  arch/um/Makefile        |  4 ++++
32  arch/x86/um/setjmp_32.S | 16 ++++++++--------
33  arch/x86/um/setjmp_64.S | 16 ++++++++--------
34  3 files changed, 20 insertions(+), 16 deletions(-)
35
36 --- a/arch/um/Makefile
37 +++ b/arch/um/Makefile
38 @@ -59,10 +59,14 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_D
39  # Same things for in6addr_loopback and mktime - found in libc. For these two we
40  # only get link-time error, luckily.
41  #
42 +# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
43 +# embedded copy of longjmp, same thing for setjmp.
44 +#
45  # These apply to USER_CFLAGS to.
46  
47  KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
48         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
49 +       -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
50         -Din6addr_loopback=kernel_in6addr_loopback \
51         -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
52  
53 --- a/arch/x86/um/setjmp_32.S
54 +++ b/arch/x86/um/setjmp_32.S
55 @@ -16,9 +16,9 @@
56  
57         .text
58         .align 4
59 -       .globl setjmp
60 -       .type setjmp, @function
61 -setjmp:
62 +       .globl kernel_setjmp
63 +       .type kernel_setjmp, @function
64 +kernel_setjmp:
65  #ifdef _REGPARM
66         movl %eax,%edx
67  #else
68 @@ -35,13 +35,13 @@ setjmp:
69         movl %ecx,20(%edx)              # Return address
70         ret
71  
72 -       .size setjmp,.-setjmp
73 +       .size kernel_setjmp,.-kernel_setjmp
74  
75         .text
76         .align 4
77 -       .globl longjmp
78 -       .type longjmp, @function
79 -longjmp:
80 +       .globl kernel_longjmp
81 +       .type kernel_longjmp, @function
82 +kernel_longjmp:
83  #ifdef _REGPARM
84         xchgl %eax,%edx
85  #else
86 @@ -55,4 +55,4 @@ longjmp:
87         movl 16(%edx),%edi
88         jmp *20(%edx)
89  
90 -       .size longjmp,.-longjmp
91 +       .size kernel_longjmp,.-kernel_longjmp
92 --- a/arch/x86/um/setjmp_64.S
93 +++ b/arch/x86/um/setjmp_64.S
94 @@ -18,9 +18,9 @@
95  
96         .text
97         .align 4
98 -       .globl setjmp
99 -       .type setjmp, @function
100 -setjmp:
101 +       .globl kernel_setjmp
102 +       .type kernel_setjmp, @function
103 +kernel_setjmp:
104         pop  %rsi                       # Return address, and adjust the stack
105         xorl %eax,%eax                  # Return value
106         movq %rbx,(%rdi)
107 @@ -34,13 +34,13 @@ setjmp:
108         movq %rsi,56(%rdi)              # Return address
109         ret
110  
111 -       .size setjmp,.-setjmp
112 +       .size kernel_setjmp,.-kernel_setjmp
113  
114         .text
115         .align 4
116 -       .globl longjmp
117 -       .type longjmp, @function
118 -longjmp:
119 +       .globl kernel_longjmp
120 +       .type kernel_longjmp, @function
121 +kernel_longjmp:
122         movl %esi,%eax                  # Return value (int)
123         movq (%rdi),%rbx
124         movq 8(%rdi),%rsp
125 @@ -51,4 +51,4 @@ longjmp:
126         movq 48(%rdi),%r15
127         jmp *56(%rdi)
128  
129 -       .size longjmp,.-longjmp
130 +       .size kernel_longjmp,.-kernel_longjmp