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runtime: Add __sparc__ case for SETCONTEXT_CLOBBERS_TLS.

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The glibc setcontext incorrectly modifies %g7 on SPARC.

From Richard Henderson.

From-SVN: r219778
This commit is contained in:
Ian Lance Taylor 2015-01-16 23:23:31 +00:00
parent 20780a006f
commit 0f59f5c120
1 changed files with 24 additions and 0 deletions
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24
libgo/runtime/proc.c
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@ -126,6 +126,30 @@ fixcontext(ucontext_t* c)
c->uc_mcontext._mc_tlsbase = tlsbase;
}
# elif defined(__sparc__)
static inline void
initcontext(void)
{
}
static inline void
fixcontext(ucontext_t *c)
{
/* ??? Using
register unsigned long thread __asm__("%g7");
c->uc_mcontext.gregs[REG_G7] = thread;
results in
error: variable ‘thread’ might be clobbered by \
‘longjmp’ or ‘vfork’ [-Werror=clobbered]
which ought to be false, as %g7 is a fixed register. */
if (sizeof (c->uc_mcontext.gregs[REG_G7]) == 8)
asm ("stx %%g7, %0" : "=m"(c->uc_mcontext.gregs[REG_G7]));
else
asm ("st %%g7, %0" : "=m"(c->uc_mcontext.gregs[REG_G7]));
}
# else
# error unknown case for SETCONTEXT_CLOBBERS_TLS