[PATCH] fix i386 regparm=3 RT signal handlers on x86_64
The recent change to make x86_64 support i386 binaries compiled with -mregparm=3 only covered signal handlers without SA_SIGINFO. (the 3-arg "real-time" ones) This is useful for klibc at least. Signed-off-by: Albert Cahalan <acahalan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -579,6 +579,11 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
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regs->rsp = (unsigned long) frame;
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regs->rsp = (unsigned long) frame;
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regs->rip = (unsigned long) ka->sa.sa_handler;
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regs->rip = (unsigned long) ka->sa.sa_handler;
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/* Make -mregparm=3 work */
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regs->rax = sig;
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regs->rdx = (unsigned long) &frame->info;
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regs->rcx = (unsigned long) &frame->uc;
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asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
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asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
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asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
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asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
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