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Add workaround for segfaults in __longjmp when compiled with ppc clang

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Stan Shebs 2018-09-25 07:20:18 -07:00 committed by Fangrui Song
parent f9bd60b7c0
commit 9b6c937b00
1 changed files with 23 additions and 0 deletions
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23
elf/dl-error-skeleton.c
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@ -85,6 +85,21 @@ fatal_error (int errcode, const char *objname, const char *occasion,
: ""));
}
/* Due to a complicated set of interactions with different symbol
versions, presumably including a VMX-specific __vmx__longjmp, PPC
clang ends calling __longjump with ld.so through the global entry
point (+0x0) instead of via the local entry point (+0x8) which
results in ld.so exceptions crashing because the TOC is not set up.
The hack here simply calls the function through a pointer, which
guarantees that the global entry point has the TOC set up. (This
may or may not be a clang bug, the symbol aliasing is tricky and
literally affects only __longjmp out of all the symbols in
libc.) */
#if defined __clang__ && defined __powerpc64__
volatile void (*longjmpptr) (struct __jmp_buf_tag __env[1], int __val)
__attribute__ ((__nothrow__)) __attribute__ ((__noreturn__)) = __longjmp;
#endif
void
_dl_signal_exception (int errcode, struct dl_exception *exception,
const char *occasion)
@ -96,7 +111,11 @@ _dl_signal_exception (int errcode, struct dl_exception *exception,
*lcatch->errcode = errcode;
/* We do not restore the signal mask because none was saved. */
#if defined __clang__ && defined __powerpc64__
(*longjmpptr) (lcatch->env[0].__jmpbuf, 1);
#else
__longjmp (lcatch->env[0].__jmpbuf, 1);
#endif
}
else
fatal_error (errcode, exception->objname, occasion, exception->errstring);
@ -118,7 +137,11 @@ _dl_signal_error (int errcode, const char *objname, const char *occation,
*lcatch->errcode = errcode;
/* We do not restore the signal mask because none was saved. */
#if defined __clang__ && defined __powerpc64__
(*longjmpptr) (lcatch->env[0].__jmpbuf, 1);
#else
__longjmp (lcatch->env[0].__jmpbuf, 1);
#endif
}
else
fatal_error (errcode, objname, occation, errstring);