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-rw-r--r--runtime/ChangeLog8
-rw-r--r--runtime/stack-i386.c63
-rw-r--r--runtime/stack-x86_64.c54
-rw-r--r--runtime/sym.c35
4 files changed, 45 insertions, 115 deletions
diff --git a/runtime/ChangeLog b/runtime/ChangeLog
index 2e9cf933..a9696791 100644
--- a/runtime/ChangeLog
+++ b/runtime/ChangeLog
@@ -1,3 +1,11 @@
+2007-07-02 Martin Hunt <hunt@redhat.com>
+
+ * sym.c (_stp_kallsyms_lookup): Improve heuristic
+ for determining when a pointer is in a function.
+ (_stp_func_print): New function.
+ * stack-i386.c, stack-x86_64.c: Remove obsolete
+ unwind code. Use _stp_func_print().
+
2007-06-22 Frank Ch. Eigler <fche@elastic.org>
* string.c (_stp_text_str): Fix handling of embedded
diff --git a/runtime/stack-i386.c b/runtime/stack-i386.c
index 161e22ee..a80de048 100644
--- a/runtime/stack-i386.c
+++ b/runtime/stack-i386.c
@@ -7,37 +7,6 @@
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
-#ifdef CONFIG_STACK_UNWIND
-#include <linux/unwind.h>
-
-static inline int _stp_valid_stack_ptr_info(struct unwind_frame_info *info)
-{
- unsigned long context = (unsigned long)UNW_SP(info) & ~(THREAD_SIZE - 1);
- unsigned long p = UNW_PC(info);
- return p > context && p < context + THREAD_SIZE - 3;
-}
-
-static int
-_stp_show_trace_unwind(struct unwind_frame_info *info, int verbose)
-{
- int n = 0;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- if (_stp_valid_stack_ptr_info(info))
- break;
- n++;
- if (verbose) {
- _stp_print_char (' ');
- _stp_symbol_print (UNW_PC(info));
- _stp_print_char ('\n');
- } else
- _stp_printf ("0x%08lx ", UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- }
- return n;
-}
-#endif /* CONFIG_STACK_UNWIND */
static inline int _stp_valid_stack_ptr(unsigned long context, unsigned long p)
{
@@ -49,31 +18,14 @@ static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels)
unsigned long *stack = (unsigned long *)&REG_SP(regs);
unsigned long context = (unsigned long)stack & ~(THREAD_SIZE - 1);
unsigned long addr;
- int uw_ret = 0;
-
-#ifdef CONFIG_STACK_UNWIND
- struct unwind_frame_info info;
- if (unwind_init_frame_info(&info, current, regs) == 0)
- uw_ret = _stp_show_trace_unwind(&info, verbose);
- stack = (void *)UNW_SP(&info);
-#endif
-
- if (uw_ret == 0)
- _stp_print("Inexact backtrace:\n");
#ifdef CONFIG_FRAME_POINTER
{
- unsigned long ebp;
- /* Grab ebp right from our regs.*/
- asm ("movl %%ebp, %0" : "=r" (ebp) : );
+ unsigned long ebp = regs->ebp;
while (_stp_valid_stack_ptr(context, (unsigned long)ebp)) {
addr = *(unsigned long *)(ebp + 4);
if (verbose) {
- if (uw_ret) {
- uw_ret = 0;
- _stp_print("Leftover inexact backtrace:\n");
- }
_stp_print_char(' ');
_stp_symbol_print (addr);
_stp_print_char('\n');
@@ -85,18 +37,7 @@ static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels)
#else
while (_stp_valid_stack_ptr(context, (unsigned long)stack)) {
addr = *stack++;
- if (_stp_kta(addr)) {
- if (verbose) {
- if (uw_ret) {
- uw_ret = 0;
- _stp_print("Leftover inexact backtrace:\n");
- }
- _stp_print_char(' ');
- _stp_symbol_print(addr);
- _stp_print_char('\n');
- } else
- _stp_printf ("0x%08lx ", addr);
- }
+ _stp_func_print(addr, verbose);
}
#endif
}
diff --git a/runtime/stack-x86_64.c b/runtime/stack-x86_64.c
index 15bac801..6f02e7ba 100644
--- a/runtime/stack-x86_64.c
+++ b/runtime/stack-x86_64.c
@@ -7,66 +7,14 @@
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
-#ifdef CONFIG_STACK_UNWIND
-#include <linux/unwind.h>
-
-static inline int _stp_valid_stack_ptr(struct unwind_frame_info *info)
-{
- unsigned long context = (unsigned long)UNW_SP(info) & ~(THREAD_SIZE - 1);
- unsigned long p = UNW_PC(info);
- return p > context && p < context + THREAD_SIZE - 3;
-}
-
-static int _stp_show_trace_unwind(struct unwind_frame_info *info, int verbose)
-{
- int n = 0;
-
- while (unwind(info) == 0 && UNW_PC(info)) {
- if (_stp_valid_stack_ptr(info))
- break;
- n++;
- if (verbose) {
- _stp_print_char(' ');
- _stp_symbol_print (UNW_PC(info));
- _stp_print_char('\n');
- } else
- _stp_printf ("0x%016lx ", UNW_PC(info));
- if (arch_unw_user_mode(info))
- break;
- }
- return n;
-}
-#endif /* CONFIG_STACK_UNWIND */
static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels)
{
unsigned long *stack = (unsigned long *)&REG_SP(regs);
unsigned long addr;
- int uw_ret = 0;
-
-#ifdef CONFIG_STACK_UNWIND
- struct unwind_frame_info info;
- if (unwind_init_frame_info(&info, current, regs) == 0)
- uw_ret = _stp_show_trace_unwind(&info, verbose);
- stack = (void *)UNW_SP(&info);
-#endif
-
- if (uw_ret == 0)
- _stp_print("Inexact backtrace:\n");
while ((long)stack & (THREAD_SIZE-1)) {
addr = *stack++;
- if (_stp_kta(addr)) {
- if (verbose) {
- if (uw_ret) {
- uw_ret = 0;
- _stp_print("Leftover inexact backtrace:\n");
- }
- _stp_print_char(' ');
- _stp_symbol_print(addr);
- _stp_print_char('\n');
- } else
- _stp_printf("0x%016lx ", addr);
- }
+ _stp_func_print(addr, verbose);
}
}
diff --git a/runtime/sym.c b/runtime/sym.c
index d8ad3f2c..c40f48db 100644
--- a/runtime/sym.c
+++ b/runtime/sym.c
@@ -32,7 +32,7 @@ unsigned long _stp_module_relocate (const char *module, const char *section, uns
return 0;
}
- dbug("_stp_relocate_module: %s, %s, %lx\n", module, section, offset);
+ dbug("%s, %s, %lx\n", module, section, offset);
STP_LOCK_MODULES;
if (! module
@@ -47,6 +47,7 @@ unsigned long _stp_module_relocate (const char *module, const char *section, uns
if (!strcmp (module, last->name) && !strcmp (section, last_sec->symbol)) {
offset += last_sec->addr;
STP_UNLOCK_MODULES;
+ dbug("offset = %lx\n", offset);
return offset;
}
}
@@ -71,6 +72,7 @@ unsigned long _stp_module_relocate (const char *module, const char *section, uns
if (!strcmp (section, last_sec->symbol)) {
offset += last_sec->addr;
STP_UNLOCK_MODULES;
+ dbug("offset = %lx\n", offset);
return offset;
}
}
@@ -127,6 +129,14 @@ static const char * _stp_kallsyms_lookup (
begin = 0;
end = m->num_symbols;
+ /* m->data is the lowest address of a data section. It should be */
+ /* after the text section. */
+ /* If our address is in the data section, then return now. */
+ if (m->data > m->text && addr >= m->data) {
+ STP_UNLOCK_MODULES;
+ return NULL;
+ }
+
/* binary search for symbols within the module */
do {
unsigned mid = (begin + end) / 2;
@@ -190,6 +200,29 @@ void _stp_symbol_print (unsigned long address)
}
}
+/* Like _stp_symbol_print, except only print if the address is a valid function address */
+
+void _stp_func_print (unsigned long address, int verbose)
+{
+ char *modname;
+ const char *name;
+ unsigned long offset, size;
+
+ name = _stp_kallsyms_lookup(address, &size, &offset, &modname, NULL);
+
+ if (name) {
+ if (verbose) {
+ if (modname)
+ _stp_printf (" %p : %s+%#lx/%#lx [%s]\n",
+ (int64_t)address, name, offset, size, modname);
+ else
+ _stp_printf (" %p : %s+%#lx/%#lx\n",
+ (int64_t)address, name, offset, size);
+ } else
+ _stp_printf ("%p ", (int64_t)address);
+ }
+}
+
void _stp_symbol_snprint (char *str, size_t len, unsigned long address)
{
char *modname;
generated by cgit (git 2.34.1) at 2025-08-02 23:54:50 +0000