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Subject[patch] 2.4.21-pre5 kksymoops for i386/ia64
Date
Automatic decoding of oops on 2.5 has been very useful, so this patch
adds kksymoops support to 2.4.21-pre5. Currently only for i386 and
ia64, other architectures are easy to add.

Index: 21-pre5.1/kernel/module.c
--- 21-pre5.1/kernel/module.c Wed, 11 Dec 2002 11:38:55 +1100 kaos (linux-2.4/j/45_module.c 1.1.2.1.3.1.3.1.1.1.2.2 644)
+++ 21-pre5.1(w)/kernel/module.c Mon, 17 Mar 2003 17:22:39 +1100 kaos (linux-2.4/j/45_module.c 1.1.2.1.3.1.3.1.1.1.2.2 644)
@@ -3,6 +3,7 @@
#include <linux/module.h>
#include <asm/module.h>
#include <asm/uaccess.h>
+#include <linux/kallsyms.h>
#include <linux/vmalloc.h>
#include <linux/smp_lock.h>
#include <asm/pgalloc.h>
@@ -1235,6 +1236,30 @@ struct seq_operations ksyms_op = {
show: s_show
};

+#define MODLIST_SIZE 4096
+
+/*
+ * this function isn't smp safe but that's not really a problem; it's
+ * called from oops context only and any locking could actually prevent
+ * the oops from going out; the line that is generated is informational
+ * only and should NEVER prevent the real oops from going out.
+ */
+void print_modules(void)
+{
+ static char modlist[MODLIST_SIZE];
+ struct module *this_mod;
+ int pos = 0;
+
+ this_mod = module_list;
+ while (this_mod) {
+ if (this_mod->name)
+ pos += snprintf(modlist+pos, MODLIST_SIZE-pos-1,
+ "%s ", this_mod->name);
+ this_mod = this_mod->next;
+ }
+ printk("%s\n",modlist);
+}
+
#else /* CONFIG_MODULES */

/* Dummy syscalls for people who don't want modules */
@@ -1280,4 +1305,81 @@ int try_inc_mod_count(struct module *mod
return 1;
}

+void print_modules(void)
+{
+}
+
#endif /* CONFIG_MODULES */
+
+
+#if defined(CONFIG_MODULES) || defined(CONFIG_KALLSYMS)
+
+#define MAX_SYMBOL_SIZE 512
+
+static void
+address_to_exported_symbol(unsigned long address, const char **mod_name,
+ const char **sym_name, unsigned long *sym_start,
+ unsigned long *sym_end)
+{
+ struct module *this_mod;
+ int i;
+
+ for (this_mod = module_list; this_mod; this_mod = this_mod->next) {
+ /* walk the symbol list of this module. Only symbols
+ who's address is smaller than the searched for address
+ are relevant; and only if it's better than the best so far */
+ for (i = 0; i < this_mod->nsyms; i++)
+ if ((this_mod->syms[i].value <= address) &&
+ (*sym_start < this_mod->syms[i].value)) {
+ *sym_start = this_mod->syms[i].value;
+ *sym_name = this_mod->syms[i].name;
+ *mod_name = this_mod->name;
+ if (i + 1 < this_mod->nsyms)
+ *sym_end = this_mod->syms[i+1].value;
+ else
+ *sym_end = (unsigned long) this_mod + this_mod->size;
+ }
+ }
+}
+
+void
+print_symbol(const char *fmt, unsigned long address)
+{
+ /* static to not take up stackspace; if we race here too bad */
+ static char buffer[MAX_SYMBOL_SIZE];
+
+ const char *mod_name = NULL, *sec_name = NULL, *sym_name = NULL;
+ unsigned long mod_start, mod_end, sec_start, sec_end,
+ sym_start, sym_end;
+ char *tag = "";
+
+ memset(buffer, 0, MAX_SYMBOL_SIZE);
+
+ sym_start = 0;
+ if (!kallsyms_address_to_symbol(address, &mod_name, &mod_start, &mod_end, &sec_name, &sec_start, &sec_end, &sym_name, &sym_start, &sym_end)) {
+ tag = "E ";
+ address_to_exported_symbol(address, &mod_name, &sym_name, &sym_start, &sym_end);
+ }
+
+ if (sym_start) {
+ if (*mod_name)
+ snprintf(buffer, MAX_SYMBOL_SIZE - 1, "%s%s+%#x/%#x [%s]",
+ tag, sym_name,
+ (unsigned int)(address - sym_start),
+ (unsigned int)(sym_end - sym_start),
+ mod_name);
+ else
+ snprintf(buffer, MAX_SYMBOL_SIZE - 1, "%s%s+%#x/%#x",
+ tag, sym_name,
+ (unsigned int)(address - sym_start),
+ (unsigned int)(sym_end - sym_start));
+ printk(fmt, buffer);
+ }
+#if 0
+ else {
+ printk(fmt, "[unresolved]");
+ }
+#endif
+}
+
+#endif
Index: 21-pre5.1/kernel/ksyms.c
--- 21-pre5.1/kernel/ksyms.c Thu, 27 Feb 2003 19:36:53 +1100 kaos (linux-2.4/j/46_ksyms.c 1.1.2.2.1.1.2.1.1.8.2.1.2.1.1.4.1.39 644)
+++ 21-pre5.1(w)/kernel/ksyms.c Mon, 17 Mar 2003 17:42:52 +1100 kaos (linux-2.4/j/46_ksyms.c 1.1.2.2.1.1.2.1.1.8.2.1.2.1.1.4.1.39 644)
@@ -56,6 +56,9 @@
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
+#ifdef CONFIG_KALLSYMS
+#include <linux/kallsyms.h>
+#endif

extern void set_device_ro(kdev_t dev,int flag);

@@ -81,6 +84,15 @@ EXPORT_SYMBOL(inter_module_get_request);
EXPORT_SYMBOL(inter_module_put);
EXPORT_SYMBOL(try_inc_mod_count);

+#ifdef CONFIG_KALLSYMS
+extern const char __start___kallsyms[];
+extern const char __stop___kallsyms[];
+EXPORT_SYMBOL(__start___kallsyms);
+EXPORT_SYMBOL(__stop___kallsyms);
+EXPORT_SYMBOL(kallsyms_symbol_to_address);
+EXPORT_SYMBOL(kallsyms_address_to_symbol);
+#endif
+
/* process memory management */
EXPORT_SYMBOL(do_mmap_pgoff);
EXPORT_SYMBOL(do_munmap);
Index: 21-pre5.1/kernel/Makefile
--- 21-pre5.1/kernel/Makefile Tue, 18 Sep 2001 13:43:44 +1000 kaos (linux-2.4/k/3_Makefile 1.1.10.2 644)
+++ 21-pre5.1(w)/kernel/Makefile Mon, 17 Mar 2003 18:11:54 +1100 kaos (linux-2.4/k/3_Makefile 1.1.10.2 644)
@@ -19,6 +19,7 @@ obj-y = sched.o dma.o fork.o exec_do
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += ksyms.o
obj-$(CONFIG_PM) += pm.o
+obj-$(CONFIG_KALLSYMS) += kallsyms.o

ifneq ($(CONFIG_IA64),y)
# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
Index: 21-pre5.1/include/linux/module.h
--- 21-pre5.1/include/linux/module.h Thu, 01 Aug 2002 11:23:16 +1000 kaos (linux-2.4/c/b/46_module.h 1.1.1.1.2.6.1.1.1.2.1.1 644)
+++ 21-pre5.1(w)/include/linux/module.h Mon, 17 Mar 2003 17:55:02 +1100 kaos (linux-2.4/c/b/46_module.h 1.1.1.1.2.6.1.1.1.2.1.1 644)
@@ -412,4 +412,29 @@ __attribute__((section("__ksymtab"))) =
#define SET_MODULE_OWNER(some_struct) do { } while (0)
#endif

+extern void print_modules(void);
+
+#if defined(CONFIG_MODULES) || defined(CONFIG_KALLSYMS)
+
+extern struct module *module_list;
+
+/*
+ * print_symbols takes a format string containing one %s.
+ * If support for resolving symbols is compiled in, the %s will
+ * be replaced by the closest symbol to the address and the entire
+ * string is printk()ed. Otherwise, nothing is printed.
+ */
+extern void print_symbol(const char *fmt, unsigned long address);
+
+#else
+
+#include <linux/errno.h>
+static inline int
+print_symbol(const char *fmt, unsigned long address)
+{
+ return -ESRCH;
+}
+
+#endif
+
#endif /* _LINUX_MODULE_H */
Index: 21-pre5.1/arch/ia64/kernel/process.c
--- 21-pre5.1/arch/ia64/kernel/process.c Thu, 27 Feb 2003 19:36:53 +1100 kaos (linux-2.4/r/c/50_process.c 1.1.3.1.3.1.2.2.1.2.1.2 644)
+++ 21-pre5.1(w)/arch/ia64/kernel/process.c Mon, 17 Mar 2003 17:19:58 +1100 kaos (linux-2.4/r/c/50_process.c 1.1.3.1.3.1.2.2.1.2.1.2 644)
@@ -12,6 +12,7 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
+#include <linux/module.h>
#include <linux/personality.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -37,8 +38,9 @@ static void
do_show_stack (struct unw_frame_info *info, void *arg)
{
unsigned long ip, sp, bsp;
+ char buf[80]; /* don't make it so big that it overflows the stack! */

- printk("\nCall Trace: ");
+ printk("\nCall Trace:\n");
do {
unw_get_ip(info, &ip);
if (ip == 0)
@@ -46,7 +48,9 @@ do_show_stack (struct unw_frame_info *in

unw_get_sp(info, &sp);
unw_get_bsp(info, &bsp);
- printk("[<%016lx>] sp=0x%016lx bsp=0x%016lx\n", ip, sp, bsp);
+ snprintf(buf, sizeof(buf), " [<%016lx>] %%s sp=0x%016lx bsp=0x%016lx\n",
+ ip, sp, bsp);
+ print_symbol(buf, ip);
} while (unw_unwind(info) >= 0);
}

@@ -73,13 +77,22 @@ show_stack (struct task_struct *task)
}

void
+dump_stack (void)
+{
+ show_stack(NULL);
+}
+
+void
show_regs (struct pt_regs *regs)
{
unsigned long ip = regs->cr_iip + ia64_psr(regs)->ri;

printk("\nPid: %d, comm: %20s\n", current->pid, current->comm);
+ printk("Registers: cpu %d, sapicid 0x%04x, time %ld\n",
+ smp_processor_id(), hard_smp_processor_id(), jiffies);
printk("psr : %016lx ifs : %016lx ip : [<%016lx>] %s\n",
regs->cr_ipsr, regs->cr_ifs, ip, print_tainted());
+ print_symbol("ip is at %s\n", ip);
printk("unat: %016lx pfs : %016lx rsc : %016lx\n",
regs->ar_unat, regs->ar_pfs, regs->ar_rsc);
printk("rnat: %016lx bsps: %016lx pr : %016lx\n",
Index: 21-pre5.1/arch/ia64/config.in
--- 21-pre5.1/arch/ia64/config.in Sun, 12 Jan 2003 11:14:47 +1100 kaos (linux-2.4/s/c/38_config.in 1.1.2.1.2.2.3.1.1.2.1.5 644)
+++ 21-pre5.1(w)/arch/ia64/config.in Mon, 17 Mar 2003 17:32:06 +1100 kaos (linux-2.4/s/c/38_config.in 1.1.2.1.2.2.3.1.1.2.1.5 644)
@@ -284,6 +284,7 @@ if [ "$CONFIG_DEBUG_KERNEL" != "n" ]; th
bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK
bool ' Turn on compare-and-exchange bug checking (slow!)' CONFIG_IA64_DEBUG_CMPXCHG
bool ' Turn on irq debug checks (slow!)' CONFIG_IA64_DEBUG_IRQ
+ bool ' Load all symbols for debugging/kksymoops' CONFIG_KALLSYMS
fi

endmenu
Index: 21-pre5.1/arch/i386/vmlinux.lds
--- 21-pre5.1/arch/i386/vmlinux.lds Fri, 11 Jan 2002 15:36:30 +1100 kaos (linux-2.4/R/c/35_vmlinux.ld 1.1.4.1.2.1 644)
+++ 21-pre5.1(w)/arch/i386/vmlinux.lds Mon, 17 Mar 2003 17:31:24 +1100 kaos (linux-2.4/R/c/35_vmlinux.ld 1.1.4.1.2.1 644)
@@ -28,6 +28,10 @@ SECTIONS
__ksymtab : { *(__ksymtab) }
__stop___ksymtab = .;

+ __start___kallsyms = .; /* All kernel symbols */
+ __kallsyms : { *(__kallsyms) }
+ __stop___kallsyms = .;
+
.data : { /* Data */
*(.data)
CONSTRUCTORS
Index: 21-pre5.1/arch/i386/kernel/traps.c
--- 21-pre5.1/arch/i386/kernel/traps.c Sun, 18 Aug 2002 23:16:19 +1000 kaos (linux-2.4/S/c/22_traps.c 1.1.2.1.1.2.1.1.1.12 644)
+++ 21-pre5.1(w)/arch/i386/kernel/traps.c Mon, 17 Mar 2003 17:19:00 +1100 kaos (linux-2.4/S/c/22_traps.c 1.1.2.1.1.2.1.1.1.12 644)
@@ -139,15 +139,16 @@ void show_trace(unsigned long * stack)
if (!stack)
stack = (unsigned long*)&stack;

- printk("Call Trace: ");
+ printk("Call Trace:");
+#if CONFIG_KALLSYMS
+ printk("\n");
+#endif
i = 1;
while (((long) stack & (THREAD_SIZE-1)) != 0) {
addr = *stack++;
if (kernel_text_address(addr)) {
- if (i && ((i % 6) == 0))
- printk("\n ");
- printk(" [<%08lx>]", addr);
- i++;
+ printk(" [<%08lx>] ", addr);
+ print_symbol("%s\n", addr);
}
}
printk("\n");
@@ -208,8 +209,11 @@ void show_registers(struct pt_regs *regs
esp = regs->esp;
ss = regs->xss & 0xffff;
}
+ print_modules();
printk("CPU: %d\nEIP: %04x:[<%08lx>] %s\nEFLAGS: %08lx\n",
smp_processor_id(), 0xffff & regs->xcs, regs->eip, print_tainted(), regs->eflags);
+
+ print_symbol("EIP is at %s\n", regs->eip);
printk("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
regs->eax, regs->ebx, regs->ecx, regs->edx);
printk("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
@@ -227,7 +231,7 @@ void show_registers(struct pt_regs *regs
printk("\nStack: ");
show_stack((unsigned long*)esp);

- printk("\nCode: ");
+ printk("Code: ");
if(regs->eip < PAGE_OFFSET)
goto bad;

Index: 21-pre5.1/arch/i386/config.in
--- 21-pre5.1/arch/i386/config.in Wed, 29 Jan 2003 16:24:17 +1100 kaos (linux-2.4/T/c/36_config.in 1.1.2.1.2.32 644)
+++ 21-pre5.1(w)/arch/i386/config.in Mon, 17 Mar 2003 17:30:24 +1100 kaos (linux-2.4/T/c/36_config.in 1.1.2.1.2.32 644)
@@ -471,6 +471,7 @@ if [ "$CONFIG_DEBUG_KERNEL" != "n" ]; th
bool ' Magic SysRq key' CONFIG_MAGIC_SYSRQ
bool ' Spinlock debugging' CONFIG_DEBUG_SPINLOCK
bool ' Compile the kernel with frame pointers' CONFIG_FRAME_POINTER
+ bool ' Load all symbols for debugging/kksymoops' CONFIG_KALLSYMS
fi

endmenu
Index: 21-pre5.1/Makefile
--- 21-pre5.1/Makefile Thu, 27 Feb 2003 19:36:53 +1100 kaos (linux-2.4/T/c/50_Makefile 1.1.2.15.1.2.2.25.2.2.1.17.1.4.1.29.1.40.1.51 644)
+++ 21-pre5.1(w)/Makefile Mon, 17 Mar 2003 17:37:53 +1100 kaos (linux-2.4/T/c/50_Makefile 1.1.2.15.1.2.2.25.2.2.1.17.1.4.1.29.1.40.1.51 644)
@@ -37,6 +37,7 @@ OBJDUMP = $(CROSS_COMPILE)objdump
MAKEFILES = $(TOPDIR)/.config
GENKSYMS = /sbin/genksyms
DEPMOD = /sbin/depmod
+KALLSYMS = /sbin/kallsyms
MODFLAGS = -DMODULE
CFLAGS_KERNEL =
PERL = perl
@@ -198,7 +199,7 @@ DRIVERS := $(DRIVERS-y)
CLEAN_FILES = \
kernel/ksyms.lst include/linux/compile.h \
vmlinux System.map \
- .tmp* \
+ $(TMPPREFIX).tmp* \
drivers/char/consolemap_deftbl.c drivers/video/promcon_tbl.c \
drivers/char/conmakehash \
drivers/char/drm/*-mod.c \
@@ -278,16 +279,42 @@ Version: dummy
boot: vmlinux
@$(MAKE) CFLAGS="$(CFLAGS) $(CFLAGS_KERNEL)" -C arch/$(ARCH)/boot

+LD_VMLINUX := $(LD) $(LINKFLAGS) $(HEAD) init/main.o init/version.o init/do_mounts.o \
+ --start-group \
+ $(CORE_FILES) \
+ $(DRIVERS) \
+ $(NETWORKS) \
+ $(LIBS) \
+ --end-group
+ifeq ($(CONFIG_KALLSYMS),y)
+LD_VMLINUX_KALLSYMS := $(TMPPREFIX).tmp_kallsyms3.o
+else
+LD_VMLINUX_KALLSYMS :=
+endif
+
vmlinux: include/linux/version.h $(CONFIGURATION) init/main.o init/version.o init/do_mounts.o linuxsubdirs
- $(LD) $(LINKFLAGS) $(HEAD) init/main.o init/version.o init/do_mounts.o \
- --start-group \
- $(CORE_FILES) \
- $(DRIVERS) \
- $(NETWORKS) \
- $(LIBS) \
- --end-group \
- -o vmlinux
+ @$(MAKE) CFLAGS="$(CFLAGS) $(CFLAGS_KERNEL)" kallsyms
+
+.PHONY: kallsyms
+
+kallsyms:
+ifeq ($(CONFIG_KALLSYMS),y)
+ @echo kallsyms pass 1
+ $(LD_VMLINUX) -o $(TMPPREFIX).tmp_vmlinux1
+ @$(KALLSYMS) $(TMPPREFIX).tmp_vmlinux1 > $(TMPPREFIX).tmp_kallsyms1.o
+ @echo kallsyms pass 2
+ @$(LD_VMLINUX) $(TMPPREFIX).tmp_kallsyms1.o -o $(TMPPREFIX).tmp_vmlinux2
+ @$(KALLSYMS) $(TMPPREFIX).tmp_vmlinux2 > $(TMPPREFIX).tmp_kallsyms2.o
+ @echo kallsyms pass 3
+ @$(LD_VMLINUX) $(TMPPREFIX).tmp_kallsyms2.o -o $(TMPPREFIX).tmp_vmlinux3
+ @$(KALLSYMS) $(TMPPREFIX).tmp_vmlinux3 > $(TMPPREFIX).tmp_kallsyms3.o
+endif
+ $(LD_VMLINUX) $(LD_VMLINUX_KALLSYMS) -o $(TMPPREFIX)vmlinux
+ifneq ($(TMPPREFIX),)
+ mv $(TMPPREFIX)vmlinux vmlinux
+endif
$(NM) vmlinux | grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | sort > System.map
+ @rm -f $(TMPPREFIX).tmp_vmlinux* $(TMPPREFIX).tmp_kallsyms*

symlinks:
rm -f include/asm
Index: 21-pre5.1/Documentation/Configure.help
--- 21-pre5.1/Documentation/Configure.help Thu, 27 Feb 2003 19:36:53 +1100 kaos (linux-2.4/Z/c/10_Configure. 1.1.2.8.2.10.1.4.2.10.2.71 644)
+++ 21-pre5.1(w)/Documentation/Configure.help Mon, 17 Mar 2003 17:34:52 +1100 kaos (linux-2.4/Z/c/10_Configure. 1.1.2.8.2.10.1.4.2.10.2.71 644)
@@ -20554,6 +20554,16 @@ CONFIG_MAGIC_SYSRQ
keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
unless you really know what this hack does.

+Load all symbols for debugging/kksymoops
+CONFIG_KALLSYMS
+ Normally only exported symbols are available to modules. For
+ debugging you may want all symbols, not just the exported ones. If
+ you say Y here then extra data is added to the kernel and modules,
+ this data lists all the non-stack symbols in the kernel or module
+ and can be used by any debugger. You need modutils >= 2.3.11 to use
+ this option. See "man kallsyms" for the data format, it adds 10-20%
+ to the size of the kernel and the loaded modules. If unsure, say N.
+
ISDN support
CONFIG_ISDN
ISDN ("Integrated Services Digital Networks", called RNIS in France)
Index: 21-pre5.1/include/linux/kallsyms.h
--- 21-pre5.1/include/linux/kallsyms.h Mon, 17 Mar 2003 18:15:52 +1100 kaos ()
+++ 21-pre5.1(w)/include/linux/kallsyms.h Mon, 17 Mar 2003 17:55:02 +1100 kaos (linux-2.4/R/g/44_kallsyms.h 644)
@@ -0,0 +1,169 @@
+/* kallsyms headers
+ Copyright 2000 Keith Owens <kaos@ocs.com.au>
+
+ This file is part of the Linux modutils. It is exported to kernel
+ space so debuggers can access the kallsyms data.
+
+ The kallsyms data contains all the non-stack symbols from a kernel
+ or a module. The kernel symbols are held between __start___kallsyms
+ and __stop___kallsyms. The symbols for a module are accessed via
+ the struct module chain which is based at module_list.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef MODUTILS_KALLSYMS_H
+#define MODUTILS_KALLSYMS_H 1
+
+/* Have to (re)define these ElfW entries here because external kallsyms
+ * code does not have access to modutils/include/obj.h. This code is
+ * included from user spaces tools (modutils) and kernel, they need
+ * different includes.
+ */
+
+#ifndef ELFCLASS32
+#ifdef __KERNEL__
+#include <linux/elf.h>
+#else /* __KERNEL__ */
+#include <elf.h>
+#endif /* __KERNEL__ */
+#endif /* ELFCLASS32 */
+
+#ifndef ELFCLASSM
+#define ELFCLASSM ELF_CLASS
+#endif
+
+#ifndef ElfW
+# if ELFCLASSM == ELFCLASS32
+# define ElfW(x) Elf32_ ## x
+# define ELFW(x) ELF32_ ## x
+# else
+# define ElfW(x) Elf64_ ## x
+# define ELFW(x) ELF64_ ## x
+# endif
+#endif
+
+/* Format of data in the kallsyms section.
+ * Most of the fields are small numbers but the total size and all
+ * offsets can be large so use the 32/64 bit types for these fields.
+ *
+ * Do not use sizeof() on these structures, modutils may be using extra
+ * fields. Instead use the size fields in the header to access the
+ * other bits of data.
+ */
+
+struct kallsyms_header {
+ int size; /* Size of this header */
+ ElfW(Word) total_size; /* Total size of kallsyms data */
+ int sections; /* Number of section entries */
+ ElfW(Off) section_off; /* Offset to first section entry */
+ int section_size; /* Size of one section entry */
+ int symbols; /* Number of symbol entries */
+ ElfW(Off) symbol_off; /* Offset to first symbol entry */
+ int symbol_size; /* Size of one symbol entry */
+ ElfW(Off) string_off; /* Offset to first string */
+ ElfW(Addr) start; /* Start address of first section */
+ ElfW(Addr) end; /* End address of last section */
+};
+
+struct kallsyms_section {
+ ElfW(Addr) start; /* Start address of section */
+ ElfW(Word) size; /* Size of this section */
+ ElfW(Off) name_off; /* Offset to section name */
+ ElfW(Word) flags; /* Flags from section */
+};
+
+struct kallsyms_symbol {
+ ElfW(Off) section_off; /* Offset to section that owns this symbol */
+ ElfW(Addr) symbol_addr; /* Address of symbol */
+ ElfW(Off) name_off; /* Offset to symbol name */
+};
+
+#define KALLSYMS_SEC_NAME "__kallsyms"
+#define KALLSYMS_IDX 2 /* obj_kallsyms creates kallsyms as section 2 */
+
+#define kallsyms_next_sec(h,s) \
+ ((s) = (struct kallsyms_section *)((char *)(s) + (h)->section_size))
+#define kallsyms_next_sym(h,s) \
+ ((s) = (struct kallsyms_symbol *)((char *)(s) + (h)->symbol_size))
+
+#ifdef CONFIG_KALLSYMS
+
+int kallsyms_symbol_to_address(
+ const char *name, /* Name to lookup */
+ unsigned long *token, /* Which module to start with */
+ const char **mod_name, /* Set to module name or "kernel" */
+ unsigned long *mod_start, /* Set to start address of module */
+ unsigned long *mod_end, /* Set to end address of module */
+ const char **sec_name, /* Set to section name */
+ unsigned long *sec_start, /* Set to start address of section */
+ unsigned long *sec_end, /* Set to end address of section */
+ const char **sym_name, /* Set to full symbol name */
+ unsigned long *sym_start, /* Set to start address of symbol */
+ unsigned long *sym_end /* Set to end address of symbol */
+ );
+
+int kallsyms_address_to_symbol(
+ unsigned long address, /* Address to lookup */
+ const char **mod_name, /* Set to module name */
+ unsigned long *mod_start, /* Set to start address of module */
+ unsigned long *mod_end, /* Set to end address of module */
+ const char **sec_name, /* Set to section name */
+ unsigned long *sec_start, /* Set to start address of section */
+ unsigned long *sec_end, /* Set to end address of section */
+ const char **sym_name, /* Set to full symbol name */
+ unsigned long *sym_start, /* Set to start address of symbol */
+ unsigned long *sym_end /* Set to end address of symbol */
+ );
+
+int kallsyms_sections(void *token,
+ int (*callback)(void *, /* token */
+ const char *, /* module name */
+ const char *, /* section name */
+ ElfW(Addr), /* Section start */
+ ElfW(Addr), /* Section end */
+ ElfW(Word) /* Section flags */
+ )
+ );
+
+#else
+
+static inline int kallsyms_address_to_symbol(
+ unsigned long address, /* Address to lookup */
+ const char **mod_name, /* Set to module name */
+ unsigned long *mod_start, /* Set to start address of module */
+ unsigned long *mod_end, /* Set to end address of module */
+ const char **sec_name, /* Set to section name */
+ unsigned long *sec_start, /* Set to start address of section */
+ unsigned long *sec_end, /* Set to end address of section */
+ const char **sym_name, /* Set to full symbol name */
+ unsigned long *sym_start, /* Set to start address of symbol */
+ unsigned long *sym_end /* Set to end address of symbol */
+ )
+{
+ return -ESRCH;
+}
+
+#endif
+
+int kallsyms_symbol_complete(
+ char *prefix_name /* Prefix of a symbol name to lookup */
+ );
+int kallsyms_symbol_next(
+ char *prefix_name, /* Prefix of a symbol name to lookup */
+ int flag /* Indicate if search from the head */
+ );
+
+#endif /* kallsyms.h */
Index: 21-pre5.1/kernel/kallsyms.c
--- 21-pre5.1/kernel/kallsyms.c Mon, 17 Mar 2003 18:15:52 +1100 kaos ()
+++ 21-pre5.1(w)/kernel/kallsyms.c Mon, 17 Mar 2003 17:48:59 +1100 kaos (linux-2.4/R/g/45_kallsyms.c 644)
@@ -0,0 +1,419 @@
+/* An example of using kallsyms data in a kernel debugger.
+
+ Copyright 2000 Keith Owens <kaos@ocs.com.au> April 2000
+
+ This file is part of the Linux modutils.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+ This code uses the list of all kernel and module symbols to :-
+
+ * Find any non-stack symbol in a kernel or module. Symbols do
+ not have to be exported for debugging.
+
+ * Convert an address to the module (or kernel) that owns it, the
+ section it is in and the nearest symbol. This finds all non-stack
+ symbols, not just exported ones.
+
+ You need modutils >= 2.3.11 and a kernel with the kallsyms patch
+ which was compiled with CONFIG_KALLSYMS.
+ */
+
+#include <linux/elf.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/kallsyms.h>
+
+/* These external symbols are only set on kernels compiled with
+ * CONFIG_KALLSYMS.
+ */
+
+extern const char __start___kallsyms[];
+extern const char __stop___kallsyms[];
+
+static struct module **kallsyms_module_list;
+
+static void kallsyms_get_module_list(void)
+{
+ const struct kallsyms_header *ka_hdr;
+ const struct kallsyms_section *ka_sec;
+ const struct kallsyms_symbol *ka_sym;
+ const char *ka_str;
+ int i;
+ const char *p;
+
+ if (__start___kallsyms >= __stop___kallsyms)
+ return;
+ ka_hdr = (struct kallsyms_header *)__start___kallsyms;
+ ka_sec = (struct kallsyms_section *)
+ ((char *)(ka_hdr) + ka_hdr->section_off);
+ ka_sym = (struct kallsyms_symbol *)
+ ((char *)(ka_hdr) + ka_hdr->symbol_off);
+ ka_str =
+ ((char *)(ka_hdr) + ka_hdr->string_off);
+
+ for (i = 0; i < ka_hdr->symbols; kallsyms_next_sym(ka_hdr, ka_sym), ++i) {
+ p = ka_str + ka_sym->name_off;
+ if (strcmp(p, "module_list") == 0) {
+ if (ka_sym->symbol_addr)
+ kallsyms_module_list = (struct module **)(ka_sym->symbol_addr);
+ break;
+ }
+ }
+}
+
+static inline void kallsyms_do_first_time(void)
+{
+ static int first_time = 1;
+ if (first_time)
+ kallsyms_get_module_list();
+ first_time = 0;
+}
+
+/* A symbol can appear in more than one module. A token is used to
+ * restart the scan at the next module, set the token to 0 for the
+ * first scan of each symbol.
+ */
+
+int kallsyms_symbol_to_address(
+ const char *name, /* Name to lookup */
+ unsigned long *token, /* Which module to start at */
+ const char **mod_name, /* Set to module name */
+ unsigned long *mod_start, /* Set to start address of module */
+ unsigned long *mod_end, /* Set to end address of module */
+ const char **sec_name, /* Set to section name */
+ unsigned long *sec_start, /* Set to start address of section */
+ unsigned long *sec_end, /* Set to end address of section */
+ const char **sym_name, /* Set to full symbol name */
+ unsigned long *sym_start, /* Set to start address of symbol */
+ unsigned long *sym_end /* Set to end address of symbol */
+ )
+{
+ const struct kallsyms_header *ka_hdr = NULL; /* stupid gcc */
+ const struct kallsyms_section *ka_sec;
+ const struct kallsyms_symbol *ka_sym = NULL;
+ const char *ka_str = NULL;
+ const struct module *m;
+ int i = 0, l;
+ const char *p, *pt_R;
+ char *p2;
+
+ kallsyms_do_first_time();
+ if (!kallsyms_module_list)
+ return(0);
+
+ /* Restart? */
+ m = *kallsyms_module_list;
+ if (token && *token) {
+ for (; m; m = m->next)
+ if ((unsigned long)m == *token)
+ break;
+ if (m)
+ m = m->next;
+ }
+
+ for (; m; m = m->next) {
+ if (!mod_member_present(m, kallsyms_start) ||
+ !mod_member_present(m, kallsyms_end) ||
+ m->kallsyms_start >= m->kallsyms_end)
+ continue;
+ ka_hdr = (struct kallsyms_header *)m->kallsyms_start;
+ ka_sym = (struct kallsyms_symbol *)
+ ((char *)(ka_hdr) + ka_hdr->symbol_off);
+ ka_str =
+ ((char *)(ka_hdr) + ka_hdr->string_off);
+ for (i = 0; i < ka_hdr->symbols; ++i, kallsyms_next_sym(ka_hdr, ka_sym)) {
+ p = ka_str + ka_sym->name_off;
+ if (strcmp(p, name) == 0)
+ break;
+ /* Unversioned requests match versioned names */
+ if (!(pt_R = strstr(p, "_R")))
+ continue;
+ l = strlen(pt_R);
+ if (l < 10)
+ continue; /* Not _R.*xxxxxxxx */
+ (void)simple_strtoul(pt_R+l-8, &p2, 16);
+ if (*p2)
+ continue; /* Not _R.*xxxxxxxx */
+ if (strncmp(p, name, pt_R-p) == 0)
+ break; /* Match with version */
+ }
+ if (i < ka_hdr->symbols)
+ break;
+ }
+
+ if (token)
+ *token = (unsigned long)m;
+ if (!m)
+ return(0); /* not found */
+
+ ka_sec = (const struct kallsyms_section *)
+ ((char *)ka_hdr + ka_hdr->section_off + ka_sym->section_off);
+ *mod_name = *(m->name) ? m->name : "kernel";
+ *mod_start = ka_hdr->start;
+ *mod_end = ka_hdr->end;
+ *sec_name = ka_sec->name_off + ka_str;
+ *sec_start = ka_sec->start;
+ *sec_end = ka_sec->start + ka_sec->size;
+ *sym_name = ka_sym->name_off + ka_str;
+ *sym_start = ka_sym->symbol_addr;
+ if (i < ka_hdr->symbols-1) {
+ const struct kallsyms_symbol *ka_symn = ka_sym;
+ kallsyms_next_sym(ka_hdr, ka_symn);
+ *sym_end = ka_symn->symbol_addr;
+ }
+ else
+ *sym_end = *sec_end;
+ return(1);
+}
+
+int kallsyms_address_to_symbol(
+ unsigned long address, /* Address to lookup */
+ const char **mod_name, /* Set to module name */
+ unsigned long *mod_start, /* Set to start address of module */
+ unsigned long *mod_end, /* Set to end address of module */
+ const char **sec_name, /* Set to section name */
+ unsigned long *sec_start, /* Set to start address of section */
+ unsigned long *sec_end, /* Set to end address of section */
+ const char **sym_name, /* Set to full symbol name */
+ unsigned long *sym_start, /* Set to start address of symbol */
+ unsigned long *sym_end /* Set to end address of symbol */
+ )
+{
+ const struct kallsyms_header *ka_hdr = NULL; /* stupid gcc */
+ const struct kallsyms_section *ka_sec = NULL;
+ const struct kallsyms_symbol *ka_sym;
+ const char *ka_str;
+ const struct module *m;
+ int i;
+ unsigned long end;
+
+ kallsyms_do_first_time();
+ if (!kallsyms_module_list)
+ return(0);
+
+ for (m = *kallsyms_module_list; m; m = m->next) {
+ if (!mod_member_present(m, kallsyms_start) ||
+ !mod_member_present(m, kallsyms_end) ||
+ m->kallsyms_start >= m->kallsyms_end)
+ continue;
+ ka_hdr = (struct kallsyms_header *)m->kallsyms_start;
+ ka_sec = (const struct kallsyms_section *)
+ ((char *)ka_hdr + ka_hdr->section_off);
+ /* Is the address in any section in this module? */
+ for (i = 0; i < ka_hdr->sections; ++i, kallsyms_next_sec(ka_hdr, ka_sec)) {
+ if (ka_sec->start <= address &&
+ (ka_sec->start + ka_sec->size) > address)
+ break;
+ }
+ if (i < ka_hdr->sections)
+ break; /* Found a matching section */
+ }
+
+ if (!m)
+ return(0); /* not found */
+
+ ka_sym = (struct kallsyms_symbol *)
+ ((char *)(ka_hdr) + ka_hdr->symbol_off);
+ ka_str =
+ ((char *)(ka_hdr) + ka_hdr->string_off);
+ *mod_name = *(m->name) ? m->name : "kernel";
+ *mod_start = ka_hdr->start;
+ *mod_end = ka_hdr->end;
+ *sec_name = ka_sec->name_off + ka_str;
+ *sec_start = ka_sec->start;
+ *sec_end = ka_sec->start + ka_sec->size;
+ *sym_name = *sec_name; /* In case we find no matching symbol */
+ *sym_start = *sec_start;
+ *sym_end = *sec_end;
+
+ for (i = 0; i < ka_hdr->symbols; ++i, kallsyms_next_sym(ka_hdr, ka_sym)) {
+ if (ka_sym->symbol_addr > address)
+ continue;
+ if (i < ka_hdr->symbols-1) {
+ const struct kallsyms_symbol *ka_symn = ka_sym;
+ kallsyms_next_sym(ka_hdr, ka_symn);
+ end = ka_symn->symbol_addr;
+ }
+ else
+ end = *sec_end;
+ if (end <= address)
+ continue;
+ if ((char *)ka_hdr + ka_hdr->section_off + ka_sym->section_off
+ != (char *)ka_sec)
+ continue; /* wrong section */
+ *sym_name = ka_str + ka_sym->name_off;
+ *sym_start = ka_sym->symbol_addr;
+ *sym_end = end;
+ break;
+ }
+ return(1);
+}
+
+/* List all sections in all modules. The callback routine is invoked with
+ * token, module name, section name, section start, section end, section flags.
+ */
+int kallsyms_sections(void *token,
+ int (*callback)(void *, const char *, const char *, ElfW(Addr), ElfW(Addr), ElfW(Word)))
+{
+ const struct kallsyms_header *ka_hdr = NULL; /* stupid gcc */
+ const struct kallsyms_section *ka_sec = NULL;
+ const char *ka_str;
+ const struct module *m;
+ int i;
+
+ kallsyms_do_first_time();
+ if (!kallsyms_module_list)
+ return(0);
+
+ for (m = *kallsyms_module_list; m; m = m->next) {
+ if (!mod_member_present(m, kallsyms_start) ||
+ !mod_member_present(m, kallsyms_end) ||
+ m->kallsyms_start >= m->kallsyms_end)
+ continue;
+ ka_hdr = (struct kallsyms_header *)m->kallsyms_start;
+ ka_sec = (const struct kallsyms_section *) ((char *)ka_hdr + ka_hdr->section_off);
+ ka_str = ((char *)(ka_hdr) + ka_hdr->string_off);
+ for (i = 0; i < ka_hdr->sections; ++i, kallsyms_next_sec(ka_hdr, ka_sec)) {
+ if (callback(
+ token,
+ *(m->name) ? m->name : "kernel",
+ ka_sec->name_off + ka_str,
+ ka_sec->start,
+ ka_sec->start + ka_sec->size,
+ ka_sec->flags))
+ return(0);
+ }
+ }
+ return(1);
+}
+
+
+/* paramter prefix_name is a buffer provided by the caller, it must ends with '\0'. */
+/* return the extra string together with the given prefix of a symbol name. */
+/* return 0 means no prefix string is found. */
+/* return >0 means prefix string is found. */
+int kallsyms_symbol_complete(
+ char *prefix_name /* Prefix of a symbol name to lookup */
+ )
+{
+ const struct kallsyms_header *ka_hdr = NULL; /* stupid gcc */
+ const struct kallsyms_symbol *ka_sym = NULL;
+ const char *ka_str = NULL;
+ const struct module *m;
+ int i = 0;
+ int prefix_len=strlen(prefix_name);
+ int cur_pos=0, last_pos=0;
+ int find=0;
+ int number=0;
+ const char *p;
+
+ kallsyms_do_first_time();
+ if (!kallsyms_module_list)
+ return(0);
+
+ for (m = *kallsyms_module_list; m; m = m->next) {
+ if (!mod_member_present(m, kallsyms_start) ||
+ !mod_member_present(m, kallsyms_end) ||
+ m->kallsyms_start >= m->kallsyms_end)
+ continue;
+ ka_hdr = (struct kallsyms_header *)m->kallsyms_start;
+ ka_sym = (struct kallsyms_symbol *)
+ ((char *)(ka_hdr) + ka_hdr->symbol_off);
+ ka_str =
+ ((char *)(ka_hdr) + ka_hdr->string_off);
+ for (i = 0; i < ka_hdr->symbols; ++i, kallsyms_next_sym(ka_hdr, ka_sym)) {
+ p = ka_str + ka_sym->name_off;
+ if (strncmp(p, prefix_name,prefix_len) == 0) {
+ ++number;
+ if (find == 0) {
+ last_pos = strlen(p);
+ strncpy(prefix_name, p, last_pos+1);
+ find = 1;
+ }
+ else {
+ for (cur_pos = prefix_len ; cur_pos < last_pos; cur_pos++) {
+ if (*(p + cur_pos) == '\0'
+ || *(p + cur_pos) != prefix_name[cur_pos]) {
+ last_pos = cur_pos;
+ prefix_name[cur_pos] = '\0';
+ break;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return number;
+}
+
+/* paramter prefix_name is a buffer provided by the caller, it must ends with '\0'. */
+/* parameter flag = 0 means search from the head, flag = 1 means continue search. */
+/* return a symbol string which matches the given prefix. */
+/* return 0 means no prefix string is found. */
+/* return >0 means prefix string is found. */
+int kallsyms_symbol_next(
+ char *prefix_name, /* Prefix of a symbol name to lookup */
+ int flag /* Indicate if search from the head */
+ )
+{
+ const struct kallsyms_header *ka_hdr = NULL; /* stupid gcc */
+ const char *ka_str = NULL;
+ static const struct kallsyms_symbol *ka_sym;
+ static const struct module *m;
+ static int i;
+ int prefix_len=strlen(prefix_name);
+ const char *p;
+
+ kallsyms_do_first_time();
+ if (!kallsyms_module_list)
+ return(0);
+
+ if(!flag) {
+ m = *kallsyms_module_list;
+ }
+
+ for (; m; m = m->next) {
+ if (!mod_member_present(m, kallsyms_start) ||
+ !mod_member_present(m, kallsyms_end) ||
+ m->kallsyms_start >= m->kallsyms_end)
+ continue;
+ ka_hdr = (struct kallsyms_header *)m->kallsyms_start;
+ if(!flag) {
+ ka_sym = (struct kallsyms_symbol *)
+ ((char *)(ka_hdr) + ka_hdr->symbol_off);
+ i = 0;
+ }
+ ka_str = ((char *)(ka_hdr) + ka_hdr->string_off);
+
+ for (; i < ka_hdr->symbols; ++i, kallsyms_next_sym(ka_hdr, ka_sym)) {
+ p = ka_str + ka_sym->name_off;
+ if (strncmp(p, prefix_name,prefix_len) == 0) {
+ strncpy(prefix_name, p, strlen(p)+1);
+ ++i;
+ kallsyms_next_sym(ka_hdr, ka_sym);
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+
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