Greetings,
I have been sucessfully able to take Amit S. Kale ([email protected])
kgdb patch for 2.4.0-test9, and create a patch for 2.4.0-test12.
I am trying to create a patch for 2.4.1.. but gcc barfs with the
following:
---------------------------------------------------------------------
make[3]: Entering directory `/usr/src/linux-2.4.1-kgdb/kernel'
gcc -D__KERNEL__ -I/usr/src/linux-2.4.1-kgdb/include -Wall -Wstrict-prototypes -g -pipe -mpreferred-stack-boundary=2 -march=i686 -fno-omit-frame-pointer -c -o sched.o sched.c
sched.c: In function `schedule':
sched.c:648: Invalid `asm' statement:
sched.c:648: fixed or forbidden register 6 (bp) was spilled for class GENERAL_REGS.
make[3]: *** [sched.o] Error 1
make[3]: Leaving directory `/usr/src/linux-2.4.1-kgdb/kernel'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/usr/src/linux-2.4.1-kgdb/kernel'
make[1]: *** [_dir_kernel] Error 2
make[1]: Leaving directory `/usr/src/linux-2.4.1-kgdb'
make: *** [stamp-build] Error 2
---------------------------------------------------------------------
This can be traced to include/asm_i386/system.h.. (switch_to)
---------------------------------------------------------------------
#define prepare_to_switch() do { } while(0)
#Define switch_to(prev,next,last) do { \
asm volatile("pushl %%esi\n\t" \
"pushl %%edi\n\t" \
"pushl %%ebp\n\t" \
"movl %%esp,%0\n\t" /* save ESP */ \
"movl %3,%%esp\n\t" /* restore ESP */ \
"movl $1f,%1\n\t" /* save EIP */ \
"pushl %4\n\t" /* restore EIP */ \
"jmp __switch_to\n" \
"1:\t" \
"popl %%ebp\n\t" \
"popl %%edi\n\t" \
"popl %%esi\n\t" \
:"=m" (prev->thread.esp),"=m" (prev->thread.eip), \
"=b" (last) \
:"m" (next->thread.esp),"m" (next->thread.eip), \
"a" (prev), "d" (next), \
"b" (prev)); \
} while (0)
---------------------------------------------------------------------
Can someone explain what is the problem here? I'm assuming that it's
one of the compile options.
The kgdb patch puts the following in the top level makefile...
and put a switch for $(CONFIG_X86_REMOTE_DEBUG) in the config tool.
The kernel compiles fine without the patch, and with the patch,
with the option turned off.
---------------------------------------------------------------------
CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
ifeq ($(CONFIG_X86_REMOTE_DEBUG),y)
CFLAGS += -g
else
CFLAGS += -fomit-frame-pointer -O2 -fno-strict-aliasing
endif
--------------------------------------------------------------------
Thanks,
Paul Schulz
I think your problem is removing all optimization
(removing '-O2' when kgdb option is enabled).
I realize that debugging is easier with no optimization
but the kernel compile always spilled registers for me
when using -O0. I can do -O1 or -O2 with no problem.
Paul Fulghum [email protected]
Microgate Corporation http://www.microgate.com
----- Original Message -----
From: "Paul Schulz" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Thursday, February 22, 2001 3:18 PM
Subject: (my) kgdb patch brakes compile.
> Greetings,
>
> I have been sucessfully able to take Amit S. Kale ([email protected])
> kgdb patch for 2.4.0-test9, and create a patch for 2.4.0-test12.
>
> I am trying to create a patch for 2.4.1.. but gcc barfs with the
> following:
>
> ---------------------------------------------------------------------
> make[3]: Entering directory `/usr/src/linux-2.4.1-kgdb/kernel'
>
gcc -D__KERNEL__ -I/usr/src/linux-2.4.1-kgdb/include -Wall -Wstrict-prototyp
es -g -pipe -mpreferred-stack-boundary=2 -march=i686 -fno-omit-frame-poin
ter -c -o sched.o sched.c
> sched.c: In function `schedule':
> sched.c:648: Invalid `asm' statement:
> sched.c:648: fixed or forbidden register 6 (bp) was spilled for class
GENERAL_REGS.
> make[3]: *** [sched.o] Error 1
> make[3]: Leaving directory `/usr/src/linux-2.4.1-kgdb/kernel'
> make[2]: *** [first_rule] Error 2
> make[2]: Leaving directory `/usr/src/linux-2.4.1-kgdb/kernel'
> make[1]: *** [_dir_kernel] Error 2
> make[1]: Leaving directory `/usr/src/linux-2.4.1-kgdb'
> make: *** [stamp-build] Error 2
> ---------------------------------------------------------------------
> This can be traced to include/asm_i386/system.h.. (switch_to)
> ---------------------------------------------------------------------
> #define prepare_to_switch() do { } while(0)
> #Define switch_to(prev,next,last) do { \
> asm volatile("pushl %%esi\n\t" \
> "pushl %%edi\n\t" \
> "pushl %%ebp\n\t" \
> "movl %%esp,%0\n\t" /* save ESP */ \
> "movl %3,%%esp\n\t" /* restore ESP */ \
> "movl $1f,%1\n\t" /* save EIP */ \
> "pushl %4\n\t" /* restore EIP */ \
> "jmp __switch_to\n" \
> "1:\t" \
> "popl %%ebp\n\t" \
> "popl %%edi\n\t" \
> "popl %%esi\n\t" \
> :"=m" (prev->thread.esp),"=m" (prev->thread.eip), \
> "=b" (last) \
> :"m" (next->thread.esp),"m" (next->thread.eip), \
> "a" (prev), "d" (next), \
> "b" (prev)); \
> } while (0)
> ---------------------------------------------------------------------
> Can someone explain what is the problem here? I'm assuming that it's
> one of the compile options.
>
> The kgdb patch puts the following in the top level makefile...
> and put a switch for $(CONFIG_X86_REMOTE_DEBUG) in the config tool.
>
> The kernel compiles fine without the patch, and with the patch,
> with the option turned off.
> ---------------------------------------------------------------------
> CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes
> ifeq ($(CONFIG_X86_REMOTE_DEBUG),y)
> CFLAGS += -g
> else
> CFLAGS += -fomit-frame-pointer -O2 -fno-strict-aliasing
> endif
> --------------------------------------------------------------------
>
> Thanks,
> Paul Schulz
>
>
>
>
> -
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