Changes between Version 3 and Version 4 of Dev/KernelHack/COINS/worklog/201110

Timestamp:

Oct 26, 2011 12:47:26 PM (13 years ago)

Author:

mitty

Comment:

--

Dev/KernelHack/COINS/worklog/201110

@@ -880 +880 @@
 type = unsigned int
 }}}
+
+ = 10/19 =
+ == add new system call (i386) ==
+ * windell57:i386 s0711489$ vim arch/x86/include/asm/unistd_32.h
+ * windell57:i386 s0711489$ vim arch/x86/kernel/syscall_table_32.S
+ * windell57:i386 s0711489$ vim arch/x86/include/asm/new_hello.h
+ * windell57:i386 s0711489$ vim arch/x86/kernel/new_hello.c
+
+ = 10/21 =
+ == add new system call (i386) (cont) ==
+ * windell57:i386 s0711489$ vim arch/x86/kernel/new_hello.c
+ * windell57:i386 s0711489$ vim arch/x86/kernel/Makefile
+{{{#!diff
+Index: arch/x86/kernel/syscall_table_32.S
+===================================================================
+--- arch/x86/kernel/syscall_table_32.S  (revision 1352)
++++ arch/x86/kernel/syscall_table_32.S  (revision 1353)
+@@ -337,3 +337,4 @@
+        .long sys_rt_tgsigqueueinfo     /* 335 */
+        .long sys_perf_event_open
+        .long sys_recvmmsg
++       .long sys_new_hello
+Index: arch/x86/kernel/Makefile
+===================================================================
+--- arch/x86/kernel/Makefile    (revision 1352)
++++ arch/x86/kernel/Makefile    (revision 1353)
+@@ -131,3 +131,5 @@
+        obj-$(CONFIG_PCI_MMCONFIG)      += mmconf-fam10h_64.o
+        obj-y                           += vsmp_64.o
+ endif
++
++obj-y                          += new_hello.o
+Index: arch/x86/kernel/new_hello.c
+===================================================================
+--- arch/x86/kernel/new_hello.c (revision 0)
++++ arch/x86/kernel/new_hello.c (revision 1353)
+@@ -0,0 +1,7 @@
++#include <linux/kernel.h>
++#include <linux/syscalls.h>
++
++SYSCALL_DEFINE1(new_hello, int, i) {
++        printk(KERN_DEBUG "new_hello() syscall with %d", i);
++        return i;
++}
+Index: arch/x86/include/asm/unistd_32.h
+===================================================================
+--- arch/x86/include/asm/unistd_32.h    (revision 1352)
++++ arch/x86/include/asm/unistd_32.h    (revision 1353)
+@@ -343,10 +343,11 @@
+ #define __NR_rt_tgsigqueueinfo 335
+ #define __NR_perf_event_open   336
+ #define __NR_recvmmsg          337
++#define __NR_new_hello         338
+ 
+ #ifdef __KERNEL__
+ 
+-#define NR_syscalls 338
++#define NR_syscalls 339
+ 
+ #define __ARCH_WANT_IPC_PARSE_VERSION
+ #define __ARCH_WANT_OLD_READDIR
+Index: arch/x86/include/asm/new_hello.h
+===================================================================
+--- arch/x86/include/asm/new_hello.h    (revision 0)
++++ arch/x86/include/asm/new_hello.h    (revision 1353)
+@@ -0,0 +1,7 @@
++#ifndef _ASM_X86_NEW_HELLO_H
++#define _ASM_X86_NEW_HELLO_H
++
++#include <asm/unistd.h>
++#define new_hello(x) syscall(__NR_new_hello, x)
++
++#endif /* _ASM_X86_NEW_HELLO_H */
+}}}
+
+ * windell57:i386 s0711489$ make
+{{{
+Kernel: arch/x86/boot/bzImage is ready  (#2)
+}}}
+ * windell57:i386 s0711489$ make modules
+
+ * s0711489@ubuntu-lucid:~$ sudo /mnt/hgfs/tools/install.sh
+ * s0711489@ubuntu-lucid:~$ sudo reboot
+{{{
+Linux ubuntu-lucid 2.6.35.14 #2 SMP Fri Oct 21 14:25:51 JST 2011 i686 GNU/Linux
+Ubuntu 10.04.3 LTS
+}}}
+
+
+ * s0711489@ubuntu-lucid:~$ cat > new_hello.c
+{{{#!cc
+#include <unistd.h>
+#include <syscall.h>
+#include <stdio.h>
+
+int main (void) {
+        printf ("new_helloc(1) -> %d\n",
+                syscall(__NR_new_hello, 1)
+        );
+}
+}}}
+ * s0711489@ubuntu-lucid:~$ gcc -I /lib/modules/2.6.35.14/build/arch/x86/include/ new_hello.c
+{{{
+new_hello.c: In function ‘main’:
+new_hello.c:8: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long int’
+}}}
+
+ * dmesgにしか出なかったので、KERN_DEBUGを消す
+
+ * windell57:i386 s0711489$ make
+{{{
+Kernel: arch/x86/boot/bzImage is ready  (#3)
+}}}
+ * windell57:i386 s0711489$ make modules
+
+ * s0711489@ubuntu-lucid:~$ sudo /mnt/hgfs/tools/install.sh
+ * s0711489@ubuntu-lucid:~$ sudo reboot
+
+
+ * s0711489@ubuntu-lucid:~$ cat > new_hello.c
+ * s0711489@ubuntu-lucid:~$ gcc -I /lib/modules/2.6.35.14/build/arch/x86/include/ new_hello.c
+ * s0711489@ubuntu-lucid:~$ ./a.out
+{{{
+new_helloc(1) -> 1
+}}}
+
+ * s0711489@ubuntu-lucid:~$ dmesg | tail -n 1
+{{{
+[  116.986628] new_hello() syscall with 1
+}}}
+ * KERN_DEBUGを消したが、結局dmesgにしか出ない
+  * \nの追加
+{{{#!diff
+Index: arch/x86/kernel/new_hello.c
+===================================================================
+--- arch/x86/kernel/new_hello.c (revision 1354)
++++ arch/x86/kernel/new_hello.c (revision 1355)
+@@ -2,6 +2,6 @@
+ #include <linux/syscalls.h>
+ 
+ SYSCALL_DEFINE1(new_hello, int, i) {
+-        printk(KERN_DEBUG "new_hello() syscall with %d", i);
++        printk("new_hello() syscall with %d\n", i);
+         return i;
+ }
+}}}
+
+ * windell57:i386 s0711489$ make
+{{{
+Kernel: arch/x86/boot/bzImage is ready  (#4)
+}}}
+ * windell57:i386 s0711489$ make modules
+ * s0711489@ubuntu-lucid:~$ sudo /mnt/hgfs/tools/install.sh
+
+
+ * s0711489@ubuntu-lucid:~$ cat > new_hello.c
+ * s0711489@ubuntu-lucid:~$ gcc -I /lib/modules/2.6.35.14/build/arch/x86/include/ new_hello.c
+ * s0711489@ubuntu-lucid:~$ ./a.out
+{{{
+new_helloc(1) -> 1
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 1
+{{{
+new_helloc(2) -> 2
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2
+{{{
+new_helloc(2) -> 2
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 3
+{{{
+new_helloc(2) -> 2
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 1 2 3 4 5
+{{{
+new_helloc(6) -> 6
+}}}
+
+ * s0711489@ubuntu-lucid:~$ dmesg | tail
+{{{
+[   62.656820] new_hello() syscall with 1
+[   66.271703] new_hello() syscall with 2
+[   68.411791] new_hello() syscall with 2
+[   70.395934] new_hello() syscall with 2
+[   77.010426] new_hello() syscall with 6
+}}}
+
+ * /var/log/messages /var/log/kern.log /var/log/syslog にも出るようになった
+{{{
+Oct 21 15:29:00 ubuntu-lucid kernel: [   62.656820] new_hello() syscall with 1
+Oct 21 15:29:04 ubuntu-lucid kernel: [   66.271703] new_hello() syscall with 2
+Oct 21 15:29:06 ubuntu-lucid kernel: [   68.411791] new_hello() syscall with 2
+Oct 21 15:29:08 ubuntu-lucid kernel: [   70.395934] new_hello() syscall with 2
+Oct 21 15:29:14 ubuntu-lucid kernel: [   77.010426] new_hello() syscall with 6
+}}}
+
+ * KERN_DEBUGを戻す
+{{{#!diff
+Index: arch/x86/kernel/new_hello.c
+===================================================================
+--- arch/x86/kernel/new_hello.c (revision 1356)
++++ arch/x86/kernel/new_hello.c (revision 1357)
+@@ -2,6 +2,6 @@
+ #include <linux/syscalls.h>
+ 
+ SYSCALL_DEFINE1(new_hello, int, i) {
+-        printk("new_hello() syscall with %d\n", i);
++        printk(KERN_DEBUG "new_hello() syscall with %d\n", i);
+         return i;
+ }
+}}}
+
+ * windell57:i386 s0711489$ make
+{{{
+Kernel: arch/x86/boot/bzImage is ready  (#5)
+}}}
+ * windell57:i386 s0711489$ make modules
+
+ * s0711489@ubuntu-lucid:~$ sudo /mnt/hgfs/tools/install.sh
+
+
+ * s0711489@ubuntu-lucid:~$ ./a.out
+{{{
+new_helloc(1) -> 1
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2
+{{{
+new_helloc(2) -> 2
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2 4
+{{{
+new_helloc(3) -> 3
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2 3 4
+{{{
+new_helloc(4) -> 4
+}}}
+
+ * s0711489@ubuntu-lucid:~$ tailf /var/log/syslog
+{{{
+Oct 21 15:39:29 ubuntu-lucid kernel: [   55.626892] new_hello() syscall with 1
+Oct 21 15:40:18 ubuntu-lucid kernel: [  104.990720] new_hello() syscall with 2
+Oct 21 15:40:20 ubuntu-lucid kernel: [  106.772709] new_hello() syscall with 3
+Oct 21 15:40:23 ubuntu-lucid kernel: [  109.867051] new_hello() syscall with 4
+}}}
+
+ * /var/log/messages には出なくなる
+
+ === trace sys_new_hello with GDB ===
+ * windell57:i386 s0711489$ gdb
+{{{
+(gdb) file vmlinux
+Reading symbols from /home/ugrad/07/s0711489/coursework/KernelHack/linux-2.6.35.14/i386/vmlinux...(no debugging symbols found)...done.
+(gdb) b sys_new_hello
+Breakpoint 1 at 0xc101d87c: file arch/x86/kernel/new_hello.c, line 4.
+(gdb) target remote localhost:8832
+Remote debugging using localhost:8832
+0xc1007cdf in native_safe_halt ()
+    at /home/ugrad/07/s0711489/coursework/KernelHack/linux-2.6.35.14/i386/arch/x86/include/asm/irqflags.h:49
+49              asm volatile("sti; hlt": : :"memory");
+(gdb) c
+Continuing.
+
+Breakpoint 1, sys_new_hello (i=1) at arch/x86/kernel/new_hello.c:4
+4       SYSCALL_DEFINE1(new_hello, int, i) {
+(gdb) n
+5               printk(KERN_DEBUG "new_hello() syscall with %d\n", i);
+(gdb) l
+1       #include <linux/kernel.h>
+2       #include <linux/syscalls.h>
+3
+4       SYSCALL_DEFINE1(new_hello, int, i) {
+5               printk(KERN_DEBUG "new_hello() syscall with %d\n", i);
+6               return i;
+7       }
+(gdb) s
+printk (fmt=0xc1449502 "<7>new_hello() syscall with %d\n")
+    at kernel/printk.c:614
+614             va_start(args, fmt);
+(gdb) l
+609                     r = vkdb_printf(fmt, args);
+610                     va_end(args);
+611                     return r;
+612             }
+613     #endif
+614             va_start(args, fmt);
+615             r = vprintk(fmt, args);
+616             va_end(args);
+617
+618             return r;
+(gdb) n
+615             r = vprintk(fmt, args);
+(gdb)
+614             va_start(args, fmt);
+(gdb)
+615             r = vprintk(fmt, args);
+(gdb)
+619     }
+(gdb)
+sys_new_hello (i=1) at arch/x86/kernel/new_hello.c:7
+7       }
+(gdb) l
+2       #include <linux/syscalls.h>
+3
+4       SYSCALL_DEFINE1(new_hello, int, i) {
+5               printk(KERN_DEBUG "new_hello() syscall with %d\n", i);
+6               return i;
+7       }
+(gdb) s
+}}}
+
+ * s0711489@ubuntu-lucid:~$ ./a.out
+{{{
+new_helloc(1) -> 1
+}}}
+
+ === add sys_new_hello entry ===
+ * windell57:i386 s0711489$ vim include/linux/syscalls.h
+{{{#!diff
+Index: include/linux/syscalls.h
+===================================================================
+--- include/linux/syscalls.h    (revision 1358)
++++ include/linux/syscalls.h    (revision 1359)
+@@ -826,4 +826,6 @@
+                        unsigned long fd, unsigned long pgoff);
+ asmlinkage long sys_old_mmap(struct mmap_arg_struct __user *arg);
+ 
++asmlinkage long sys_new_hello(int i);
++
+ #endif
+}}}
+
+ * windell57:i386 s0711489$ make
+{{{
+Kernel: arch/x86/boot/bzImage is ready  (#6)
+}}}
+ * windell57:i386 s0711489$ make modules
+
+ * s0711489@ubuntu-lucid:~$ sudo /mnt/hgfs/tools/install.sh
+
+ * s0711489@ubuntu-lucid:~$ ./a.out
+{{{
+new_helloc(1) -> 1
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2
+{{{
+new_helloc(2) -> 2
+}}}
+ * s0711489@ubuntu-lucid:~$ ./a.out 2 3
+{{{
+new_helloc(3) -> 3
+}}}
+
+ * s0711489@ubuntu-lucid:~$ tailf /var/log/kern.log
+{{{
+Oct 21 16:16:20 ubuntu-lucid kernel: [   59.045533] new_hello() syscall with 1
+Oct 21 16:16:22 ubuntu-lucid kernel: [   61.043321] new_hello() syscall with 2
+Oct 21 16:16:24 ubuntu-lucid kernel: [   63.470397] new_hello() syscall with 3
+}}}
+
+
+ == add new system call (x86_64) ==
+ * viola04:linux-2.6.35.14 s0711489$ svn cp i386/arch/x86/include/asm/new_hello.h x86_64/arch/x86/include/asm/new_hello.h
+ * viola04:linux-2.6.35.14 s0711489$ svn cp i386/arch/x86/kernel/new_hello.c x86_64/arch/x86/kernel/
+ * viola04:linux-2.6.35.14 s0711489$ svn merge i386/include/linux/syscalls.h x86_64/include/linux/syscalls.h -r 1358:1359