Florian Delizy wrote:
Hi,
I am trying to make kgdb work on x86_64 with the 2.6.17 kernel version.
I took the last cvs version as it seemed in the cvs tree comments that
patches had been moved to 2.6.17, but when I try to start a kernel with
kgdbwait I get the following message :
Kernel command line: root=/dev/sda1 ro mouse=imps2 vga=791 console=tty0
gdbttys=0 console=ttyS1 kgdbwait
KGDB cannot initialize I/O yet.
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 32768 bytes)
time.c: Using 3.579545 MHz WALL PM GTOD PIT/TSC timer.
time.c: Detected 1995.046 MHz processor.
Console: colour dummy device 80x25
Waiting for connection from remote gdb...
int3: 0000 [1]
CPU 0
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.17 #4
RIP: 0010:[<ffffffff80248d38>] <ffffffff80248d38>{breakpoint+167}
RSP: 0018:ffffffff8063eee8 EFLAGS: 00000292
RAX: 000000000000002d RBX: 0000000000000000 RCX: 0000000000000d35
RDX: 0000000000000d35 RSI: 0000000000000d35 RDI: ffffffff8058b3d0
RBP: ffffffff8063eee8 R08: 0000000000000002 R09: ffff81000c008000
R10: ffffffff8063eca8 R11: 00000000000000a8 R12: ffffffff806630f0
R13: 000000000000000a R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffffffff806b8000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006a0
Process swapper (pid: 0, threadinfo ffffffff806be000, task
ffffffff80583360)
Stack: ffffffff8063eef8 ffffffff80248d70 ffffffff8063ef18
ffffffff8022ce7d
(complete output is attached -- eikichi.log --, as well as .config)
At this point I did not even try to connect with kgdb, I just had a
console listening on ttyS1 (from where I get this listing). It's already
been some time I try to make it work ...
Can anyone point at me what I did wrong or give me a start point ?
OK, after spending a whole nite on the problem I finally found the bug.
It is a gcc 4.1 bug !! (problem with weak symbols) and it was already
reported on the list, but I only understood after tracking it down....
Anyway, here is a workaround patch, but only use it with gcc < 4.1.2
(September 01 pre release). I just upgraded my gcc from the debian
testing distribution, and it works fine for me now :)
Happy hacking !
Florian
Index: linux/kernel/kgdb.c
===================================================================
--- linux.orig/kernel/kgdb.c 2006-09-08 02:51:43.000000000 +0200
+++ linux/kernel/kgdb.c 2006-09-08 02:55:21.000000000 +0200
@@ -142,7 +142,9 @@
*/
int __attribute__ ((weak))
kgdb_arch_init(void)
-{
+{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return 0;
}
@@ -157,6 +159,8 @@
void __attribute__ ((weak))
kgdb_disable_hw_debug(struct pt_regs *regs)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/*
@@ -167,6 +171,8 @@
int __attribute__ ((weak))
kgdb_skipexception(int exception, struct pt_regs *regs)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return 0;
}
@@ -177,6 +183,8 @@
int __attribute__ ((weak))
kgdb_set_hw_break(unsigned long addr)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return 0;
}
@@ -187,6 +195,8 @@
int __attribute__ ((weak))
kgdb_remove_hw_break(unsigned long addr)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return 0;
}
@@ -196,6 +206,8 @@
void __attribute__ ((weak))
kgdb_remove_all_hw_break(void)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/**
@@ -215,6 +227,8 @@
void __attribute__ ((weak))
kgdb_correct_hw_break(void)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/**
@@ -231,6 +245,8 @@
void __attribute__ ((weak))
kgdb_post_master_code(struct pt_regs *regs, int e_vector, int err_code)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/**
@@ -250,6 +266,8 @@
void __attribute__ ((weak))
kgdb_roundup_cpus(unsigned long flags)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/**
@@ -261,6 +279,8 @@
void __attribute__ ((weak))
kgdb_shadowinfo(struct pt_regs *regs, char *buffer, unsigned threadid)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
}
/**
@@ -275,6 +295,8 @@
struct task_struct __attribute__ ((weak))
* kgdb_get_shadow_thread(struct pt_regs *regs, int threadid)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return NULL;
}
@@ -289,6 +311,8 @@
struct pt_regs __attribute__ ((weak))
* kgdb_shadow_regs(struct pt_regs *regs, int threadid)
{
+ printk( KERN_INFO "KGDB %s:%d default %s called ... doing nothing\n"
+ , __FILE__, __LINE__, __FUNCTION__);
return NULL;
}
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