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[Qemu-devel] Syscall 269

From: James Pellow
Subject: [Qemu-devel] Syscall 269
Date: Thu, 18 Nov 2004 01:38:46 -0800
User-agent: KMail/1.7.1

Hi All,

I am trying to chroot to a gentoo flavor of arm linux on my AMD tbird-1.4GHz.  
I have set up binfmt_misc and qemu to allow me to do the chroot, and all 
seems to be working well.  Now I wanted to emerge some stuff, and I get the 
following message:

qemu: Unsupported syscall: 269.

Looking at the arm linux kernel source, I see that 269 is utimes.  Looking at 
the source code for qemu it seems that all I have to do is to add a define 
for TARGET_NR_utimes in all linux-user/*/syscall_nr.h and then add a new case 
in linux-user/syscall.c.  

So, I gave it a shot.  The patch is at the bottom of this message.  This is 
the first time I have looked at the qemu sources, so I am likely missing 
something, but the patch does seem to allow emerge to work properly under 
gentoo.  If a correct implementation requires more work, I am happy to do 
that too, just let me know.  BTW, I am not subscribed to this list to please 
CC me.

Many thanks for a wonderful app.  


James A. Pellow, President
Alent Design Solutions
(509) 526-0682

diff -ruN qemu-0.6.1/linux-user/arm/syscall_nr.h 
--- qemu-0.6.1/linux-user/arm/syscall_nr.h      2004-11-14 12:51:33.000000000 
+++ qemu-0.6.1_new/linux-user/arm/syscall_nr.h  2004-11-18 00:58:44.973757936 
@@ -259,3 +259,5 @@
                                        /* 254 for set_thread_area */
                                        /* 255 for get_thread_area */
                                        /* 256 for set_tid_address */
+#define TARGET_NR_utimes                       (269)
diff -ruN qemu-0.6.1/linux-user/i386/syscall_nr.h 
--- qemu-0.6.1/linux-user/i386/syscall_nr.h     2004-11-14 12:51:33.000000000 
+++ qemu-0.6.1_new/linux-user/i386/syscall_nr.h 2004-11-18 01:28:59.324934632 
@@ -271,3 +271,5 @@
 #define TARGET_NR_clock_getres (TARGET_NR_timer_create+7)
 #define TARGET_NR_clock_nanosleep      (TARGET_NR_timer_create+8)

+#define TARGET_NR_utimes               271
diff -ruN qemu-0.6.1/linux-user/syscall.c qemu-0.6.1_new/linux-user/syscall.c
--- qemu-0.6.1/linux-user/syscall.c     2004-11-14 12:51:33.000000000 -0800
+++ qemu-0.6.1_new/linux-user/syscall.c 2004-11-18 01:15:54.561236848 -0800
@@ -3025,6 +3025,10 @@
     case TARGET_NR_get_thread_area:
         goto unimplemented_nowarn;
+    case TARGET_NR_utimes:
+       ret = get_errno(utimes((const char *)arg1,
+               (const struct timeval *)arg2));
+       break;
         gemu_log("qemu: Unsupported syscall: %d\n", num);

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