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Date: Tue, 5 Aug 2008 00:26:35 -0600
From: jmerkey@...fmountaingroup.com
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.27-rc1-git5 2/26] mdb: correct kprobes int3 trap
Centralized external definitions into include files and corrected
the file to conform to Linux coding practices. fixed word wrap
problems with patches.
Corrected kprobes section for int3 trap where CONFIG_MDB is always
true.
Signed-off-by: Jeffrey Vernon Merkey (jmerkey@...fmountaingroup.com)
--- a/arch/x86/kernel/traps_32.c 2008-08-04 15:53:24.000000000 -0600
+++ b/arch/x86/kernel/traps_32.c 2008-08-04 16:00:25.000000000 -0600
@@ -46,6 +46,10 @@
#include <linux/edac.h>
#endif
+#ifdef CONFIG_MDB
+#include <linux/mdb.h>
+#endif // CONFIG_MDB
+
#include <asm/arch_hooks.h>
#include <asm/stacktrace.h>
#include <asm/processor.h>
@@ -452,8 +456,15 @@
*/
void die(const char *str, struct pt_regs *regs, long err)
{
- unsigned long flags = oops_begin();
+#ifdef CONFIG_MDB
+ unsigned long flags;
+ mdb_oops = (unsigned char *)str;
+ mdb(SOFTWARE_EXCEPTION, err, regs);
+ flags = oops_begin();
+#else
+ unsigned long flags = oops_begin();
+#endif // CONFIG_MDB
if (die_nest_count < 3) {
report_bug(regs->ip, regs);
@@ -573,9 +584,9 @@
}
DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
-#ifndef CONFIG_KPROBES
+#if !defined(CONFIG_KPROBES) && !defined(CONFIG_MDB)
DO_VM86_ERROR(3, SIGTRAP, "int3", int3)
-#endif
+#endif // CONFIG_MDB
DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow)
DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds)
DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
@@ -718,6 +729,9 @@
{
if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
+#ifdef CONFIG_MDB
+ mdb(NMI_EXCEPTION, reason, regs); // nmi is code 2
+#endif // CONFIG_MDB
#ifdef CONFIG_MCA
/*
* Might actually be able to figure out what the guilty party
@@ -756,6 +770,9 @@
printk(" on CPU%d, ip %08lx, registers:\n",
smp_processor_id(), regs->ip);
show_registers(regs);
+#ifdef CONFIG_MDB
+ mdb(NMI_EXCEPTION, 0, regs); // nmi is code 2
+#endif // CONFIG_MDB
if (do_panic)
panic("Non maskable interrupt");
console_silent();
@@ -785,6 +802,10 @@
if (!cpu)
reason = get_nmi_reason();
+#if defined(CONFIG_SMP) && defined(CONFIG_MDB)
+ if (mdb(NMI_EXCEPTION, 0, regs))
+ return;
+#endif // CONFIG_MDB
if (!(reason & 0xc0)) {
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
== NOTIFY_STOP)
@@ -850,6 +871,10 @@
#ifdef CONFIG_KPROBES
void __kprobes do_int3(struct pt_regs *regs, long error_code)
{
+#ifdef CONFIG_MDB
+ if (mdb(BREAKPOINT_EXCEPTION, error_code, regs))
+ return;
+#endif // CONFIG_MDB
trace_hardirqs_fixup();
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
@@ -865,6 +890,16 @@
}
#endif
+#if !defined(CONFIG_KPROBES)
+fastcall void do_int3(struct pt_regs * regs, long error_code)
+{
+#if defined(CONFIG_MDB)
+ if (mdb(BREAKPOINT_EXCEPTION, error_code, regs))
+ return;
+#endif // CONFIG_MDB
+ do_trap(3, SIGTRAP, "int3", 1, regs, error_code, NULL);
+}
+#endif
/*
* Our handling of the processor debug registers is non-trivial.
* We do not clear them on entry and exit from the kernel. Therefore
@@ -895,6 +930,10 @@
trace_hardirqs_fixup();
get_debugreg(condition, 6);
+#ifdef CONFIG_MDB
+ if (mdb(DEBUGGER_EXCEPTION, error_code, regs))
+ return;
+#endif // CONFIG_MDB
/*
* The processor cleared BTF, so don't mark that we need it set.
--
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