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Date: Wed, 28 Nov 2007 12:38:37 -0500
From: Jeff Dike <jdike@...toit.com>
To: Miklos Szeredi <miklos@...redi.hu>
Cc: mingo@...e.hu, user-mode-linux-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: -rt doesn't compile for UML
On Wed, Nov 28, 2007 at 04:38:39PM +0100, Miklos Szeredi wrote:
> It doesn't help in this case. I've gotten as far as realizing that
> the latency tracer needs the irqflags tracing
> (Documentation/irqflags-tracing.tx) and that UML doesn't yet support
> that.
Try the patch below - no guarantees, however, it boots here and
printks stuff.
--
Work email - jdike at linux dot intel dot com
Index: linux-2.6.22/arch/um/Kconfig
===================================================================
--- linux-2.6.22.orig/arch/um/Kconfig 2007-11-28 10:57:24.000000000 -0500
+++ linux-2.6.22/arch/um/Kconfig 2007-11-28 12:36:39.000000000 -0500
@@ -33,18 +33,13 @@ config PCI
config PCMCIA
bool
-# Yet to do!
-config TRACE_IRQFLAGS_SUPPORT
- bool
- default n
-
config LOCKDEP_SUPPORT
bool
default y
config STACKTRACE_SUPPORT
bool
- default n
+ default y
config GENERIC_CALIBRATE_DELAY
bool
Index: linux-2.6.22/arch/um/Kconfig.debug
===================================================================
--- linux-2.6.22.orig/arch/um/Kconfig.debug 2007-11-28 10:57:22.000000000 -0500
+++ linux-2.6.22/arch/um/Kconfig.debug 2007-11-28 11:34:19.000000000 -0500
@@ -2,6 +2,10 @@ menu "Kernel hacking"
source "lib/Kconfig.debug"
+config TRACE_IRQFLAGS_SUPPORT
+ bool
+ default y
+
config GPROF
bool "Enable gprof support"
depends on DEBUG_INFO && FRAME_POINTER
Index: linux-2.6.22/arch/um/include/sysdep-i386/tls.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/sysdep-i386/tls.h 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/include/sysdep-i386/tls.h 2007-11-28 12:36:39.000000000 -0500
@@ -1,8 +1,6 @@
#ifndef _SYSDEP_TLS_H
#define _SYSDEP_TLS_H
-# ifndef __KERNEL__
-
/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which
* may be named user_desc (but in 2.4 and in header matching its API was named
* modify_ldt_ldt_s). */
@@ -19,13 +17,6 @@ typedef struct um_dup_user_desc {
unsigned int useable:1;
} user_desc_t;
-# else /* __KERNEL__ */
-
-# include <asm/ldt.h>
-typedef struct user_desc user_desc_t;
-
-# endif /* __KERNEL__ */
-
#define GDT_ENTRY_TLS_MIN_I386 6
#define GDT_ENTRY_TLS_MIN_X86_64 12
Index: linux-2.6.22/arch/um/include/sysdep-x86_64/tls.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/sysdep-x86_64/tls.h 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/include/sysdep-x86_64/tls.h 2007-11-28 12:36:39.000000000 -0500
@@ -1,8 +1,6 @@
#ifndef _SYSDEP_TLS_H
#define _SYSDEP_TLS_H
-# ifndef __KERNEL__
-
/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which
* may be named user_desc (but in 2.4 and in header matching its API was named
* modify_ldt_ldt_s). */
@@ -20,10 +18,4 @@ typedef struct um_dup_user_desc {
unsigned int lm:1;
} user_desc_t;
-# else /* __KERNEL__ */
-
-# include <asm/ldt.h>
-typedef struct user_desc user_desc_t;
-
-# endif /* __KERNEL__ */
#endif /* _SYSDEP_TLS_H */
Index: linux-2.6.22/arch/um/kernel/sysrq.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/sysrq.c 2007-11-28 10:57:22.000000000 -0500
+++ linux-2.6.22/arch/um/kernel/sysrq.c 2007-11-28 12:36:39.000000000 -0500
@@ -7,6 +7,7 @@
#include "linux/kernel.h"
#include "linux/module.h"
#include "linux/kallsyms.h"
+#include "linux/stacktrace.h"
#include "asm/page.h"
#include "asm/processor.h"
#include "sysrq.h"
@@ -78,3 +79,4 @@ void show_stack(struct task_struct *task
printk("Call Trace: \n");
show_trace(task, esp);
}
+
Index: linux-2.6.22/arch/um/sys-i386/tls.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/tls.c 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/sys-i386/tls.c 2007-11-28 12:36:39.000000000 -0500
@@ -24,7 +24,8 @@ int do_set_thread_area(struct user_desc
u32 cpu;
cpu = get_cpu();
- ret = os_set_thread_area(info, userspace_pid[cpu]);
+ ret = os_set_thread_area((struct um_dup_user_desc *) info,
+ userspace_pid[cpu]);
put_cpu();
if (ret)
@@ -40,7 +41,8 @@ int do_get_thread_area(struct user_desc
u32 cpu;
cpu = get_cpu();
- ret = os_get_thread_area(info, userspace_pid[cpu]);
+ ret = os_get_thread_area((struct um_dup_user_desc *) info,
+ userspace_pid[cpu]);
put_cpu();
if (ret)
Index: linux-2.6.22/include/asm-um/irqflags.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/irqflags.h 2007-11-28 10:57:22.000000000 -0500
+++ linux-2.6.22/include/asm-um/irqflags.h 2007-11-28 11:34:19.000000000 -0500
@@ -1,6 +1,31 @@
#ifndef __UM_IRQFLAGS_H
#define __UM_IRQFLAGS_H
-/* Empty for now */
+#include "os.h"
+
+static inline int raw_irqs_disabled_flags(unsigned long flags)
+{
+ return flags == 0;
+}
+
+static inline void raw_local_irq_disable(void)
+{
+ block_signals();
+}
+
+static inline void raw_local_irq_enable(void)
+{
+ unblock_signals();
+}
+
+static inline void raw_local_irq_restore(unsigned long flags)
+{
+ set_signals(flags);
+}
+
+#define raw_local_irq_save(flags) do { typecheck(unsigned long, flags); \
+ (flags) = get_signals(); \
+ block_signals(); } while(0)
+
#endif
Index: linux-2.6.22/arch/um/include/os.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/os.h 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/include/os.h 2007-11-28 12:36:39.000000000 -0500
@@ -213,8 +213,8 @@ extern int helper_wait(int pid);
/* tls.c */
-extern int os_set_thread_area(user_desc_t *info, int pid);
-extern int os_get_thread_area(user_desc_t *info, int pid);
+extern int os_set_thread_area(struct um_dup_user_desc *info, int pid);
+extern int os_get_thread_area(struct um_dup_user_desc *info, int pid);
/* umid.c */
extern int umid_file_name(char *name, char *buf, int len);
Index: linux-2.6.22/arch/um/kernel/Makefile
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/Makefile 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/kernel/Makefile 2007-11-28 12:36:39.000000000 -0500
@@ -15,6 +15,8 @@ obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o
obj-$(CONFIG_GCOV) += gmon_syms.o
+subarch-obj-$(CONFIG_STACKTRACE) += kernel/stacktrace.o
+
USER_OBJS := config.o
include arch/um/scripts/Makefile.rules
Index: linux-2.6.22/arch/um/sys-i386/sysrq.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/sysrq.c 2007-11-28 12:36:28.000000000 -0500
+++ linux-2.6.22/arch/um/sys-i386/sysrq.c 2007-11-28 12:36:39.000000000 -0500
@@ -7,6 +7,7 @@
#include "linux/smp.h"
#include "linux/sched.h"
#include "linux/kallsyms.h"
+#include <asm/stacktrace.h>
#include "asm/ptrace.h"
#include "sysrq.h"
@@ -44,33 +45,97 @@ static inline int valid_stack_ptr(struct
}
/* Adapted from i386 (we also print the address we read from). */
-static inline unsigned long print_context_stack(struct thread_info *tinfo,
- unsigned long *stack, unsigned long ebp)
+static unsigned long print_context_stack(struct thread_info *tinfo,
+ unsigned long *stack, unsigned long ebp,
+ const struct stacktrace_ops *ops,
+ void *data)
{
unsigned long addr;
#ifdef CONFIG_FRAME_POINTER
while (valid_stack_ptr(tinfo, (void *)ebp)) {
addr = *(unsigned long *)(ebp + 4);
- printk("%08lx: [<%08lx>]", ebp + 4, addr);
- print_symbol(" %s", addr);
- printk("\n");
+ ops->address(data, addr);
ebp = *(unsigned long *)ebp;
}
#else
while (valid_stack_ptr(tinfo, stack)) {
addr = *stack;
- if (__kernel_text_address(addr)) {
- printk("%08lx: [<%08lx>]", (unsigned long) stack, addr);
- print_symbol(" %s", addr);
- printk("\n");
- }
+ if (__kernel_text_address(addr))
+ ops->address(data, addr);
stack++;
}
#endif
return ebp;
}
+void dump_trace(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, const struct stacktrace_ops *ops,
+ void *data)
+{
+ struct thread_info *context;
+ unsigned long ebp = 0;
+
+ if (!task)
+ task = current;
+
+ if (!stack) {
+ unsigned long dummy;
+ stack = &dummy;
+ if (task != current)
+ stack = (unsigned long *) KSTK_ESP(task);
+ }
+
+#ifdef CONFIG_FRAME_POINTER
+ if (!ebp) {
+ if (task == current) {
+ /* Grab ebp right from our regs */
+ asm ("movl %%ebp, %0" : "=r" (ebp) : );
+ } else {
+ ebp = KSTK_EBP(task);
+ }
+ }
+#endif
+
+ context = (struct thread_info *)
+ ((unsigned long)stack & (~(THREAD_SIZE - 1)));
+ ebp = print_context_stack(context, stack, ebp, ops, data);
+}
+
+static void show_trace_warning_symbol(void *data, char *msg,
+ unsigned long symbol)
+{
+ printk(data);
+ print_symbol(msg, symbol);
+ printk("\n");
+}
+
+static void show_trace_warning(void *data, char *msg)
+{
+ printk("%s%s\n", (char *) data, msg);
+}
+
+static int show_trace_stack(void *data, char *name)
+{
+ return 0;
+}
+
+/*
+ * Print one address/symbol entries per line.
+ */
+static void show_trace_address(void *data, unsigned long addr)
+{
+ printk("%s [<%08lx>] ", (char *) data, addr);
+ print_symbol("%s\n", addr);
+}
+
+static const struct stacktrace_ops show_trace_ops = {
+ .warning = show_trace_warning,
+ .warning_symbol = show_trace_warning_symbol,
+ .stack = show_trace_stack,
+ .address = show_trace_address,
+};
+
void show_trace(struct task_struct* task, unsigned long * stack)
{
unsigned long ebp;
@@ -79,7 +144,8 @@ void show_trace(struct task_struct* task
/* Turn this into BUG_ON if possible. */
if (!stack) {
stack = (unsigned long*) &stack;
- printk("show_trace: got NULL stack, implicit assumption task == current");
+ printk("show_trace: got NULL stack, implicit assumption "
+ "task == current");
WARN_ON(1);
}
@@ -94,7 +160,7 @@ void show_trace(struct task_struct* task
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
- print_context_stack(context, stack, ebp);
+ print_context_stack(context, stack, ebp, &show_trace_ops, "");
printk("\n");
}
Index: linux-2.6.22/include/asm-um/stacktrace.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.22/include/asm-um/stacktrace.h 2007-11-28 12:36:39.000000000 -0500
@@ -0,0 +1,6 @@
+#ifndef __UM_STACKTRACE_H
+#define __UM_STACKTRACE_H
+
+#include "asm/arch/stacktrace.h"
+
+#endif
-
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