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Date: Sat, 18 Dec 2004 21:11:00 -0800
From: John Reiser <jreiser@BitWagon.com>
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Subject: [Qemu-devel] qemu on Fedora Core 3 (Linux 2.6.9+), glibc-2.3.3
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To: qemu-devel@nongnu.org

In order to run qemu-snapshot-2004-12-17_23.tar.bz2 on:
    Fedora Core 3  kernel-2.6.8-1.681_FC3  i686
    gcc (GCC) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)
    glibc-2.3.3
    binutils-2.15.92.0.2-5
I had to use the extra file and patch below.
Otherwise I got very early SIGSEGVs.

-----__restore.S  [append __restore.o to VL_OBJS in i386/Makefile]
#include <asm/unistd.h>

__restore: .globl __restore
	pop %eax
	movl $ __NR_sigreturn,%eax
	int $0x80

__restore_rt: .globl __restore_rt
	movl $ __NR_rt_sigreturn,%eax
	int $0x80
-----


--- vl.c.orig	2004-12-12 14:20:04.000000000 -0800
+++ vl.c	2004-12-18 20:53:09.496799856 -0800
@@ -882,6 +882,9 @@

#endif /* !defined(_WIN32) */

+extern void __restore(void);
+extern void __restore_rt(void);
+
static void init_timers(void)
{
     rt_clock = qemu_new_clock(QEMU_TIMER_REALTIME);
@@ -913,7 +916,9 @@
         sigfillset(&act.sa_mask);
         act.sa_flags = 0;
#if defined (TARGET_I386) && defined(USE_CODE_COPY)
-        act.sa_flags |= SA_ONSTACK;
+#define SA_RESTORER   0x04000000
+        act.sa_flags |= SA_ONSTACK | SA_RESTORER;
+	act.sa_restorer = __restore;
#endif
         act.sa_handler = host_alarm_handler;
         sigaction(SIGALRM, &act, NULL);
@@ -3402,7 +3407,8 @@
         sigfillset(&act.sa_mask);
         act.sa_flags = SA_SIGINFO;
#if defined (TARGET_I386) && defined(USE_CODE_COPY)
-        act.sa_flags |= SA_ONSTACK;
+        act.sa_flags |= SA_ONSTACK | SA_RESTORER;
+	act.sa_restorer = __restore_rt;
#endif
         act.sa_sigaction = host_segv_handler;
         sigaction(SIGSEGV, &act, NULL);

--