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Don't rely on undefined compiler behaviour.

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This commit is contained in:
Ulrich Drepper 1999-04-12 09:02:56 +00:00
parent 65e8edc76b
commit 2761e5acd7
1 changed files with 5 additions and 16 deletions
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21
sysdeps/unix/sysv/linux/arm/sigaction.c
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@ -39,11 +39,14 @@ int __libc_missing_rt_sigs;
#define SA_RESTORER 0x04000000
extern void __default_sa_restorer(void);
extern void __default_rt_sa_restorer(void);
/* When RT signals are in use we need to use a different return stub. */
#ifdef __NR_rt_sigreturn
#define choose_restorer(flags) \
(flags & SA_SIGINFO) ? &&__default_rt_sa_restorer \
: &&__default_sa_restorer
(flags & SA_SIGINFO) ? __default_rt_sa_restorer \
: __default_sa_restorer
#else
#define choose_restorer(flags) \
&&__default_sa_restorer
@ -142,20 +145,6 @@ __sigaction (sig, act, oact)
#endif
}
return result;
/* If no SA_RESTORER function was specified by the application we use
this one. This avoids the need for the kernel to synthesise a return
instruction on the stack, which would involve expensive cache flushes. */
__default_sa_restorer:
asm volatile ("swi %0" : : "i" (__NR_sigreturn));
#ifdef __NR_rt_sigreturn
__default_rt_sa_restorer:
asm volatile ("swi %0" : : "i" (__NR_rt_sigreturn));
#endif
/* NOTREACHED */
return -1;
}
weak_alias (__sigaction, sigaction)