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* Unconditionally print a stack trace when we entered KDL via panic().

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* Print the initial stack trace safely, i.e. in a setjmp() + fault handler
  environment.
* Disable pagination while executing the executing the panic() commands. This
  way even when it is not possible to use the keyboard we get the full output.
* Added "panic_commands" kernel debugger command, to execute the panic()
  commands again (with pagination enabled).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35902 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2010-03-18 16:17:15 +00:00
parent 976e52595e
commit 2d2b6b1f1a
1 changed files with 72 additions and 29 deletions
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101
src/system/kernel/debug/debug.cpp
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@ -747,6 +747,48 @@ print_kernel_debugger_message()
}
static void
execute_panic_commands()
{
if (sCurrentKernelDebuggerMessage == NULL
|| strstr(sCurrentKernelDebuggerMessage,
kKDLMessageCommandSeparator) == NULL) {
return;
}
// Indeed there are commands to execute.
const size_t kCommandBufferSize = 512;
char* commandBuffer = (char*)debug_malloc(kCommandBufferSize);
if (commandBuffer != NULL) {
va_list tempArgs;
va_copy(tempArgs, sCurrentKernelDebuggerMessageArgs);
if (vsnprintf(commandBuffer, kCommandBufferSize,
sCurrentKernelDebuggerMessage, tempArgs)
< (int)kCommandBufferSize) {
const char* commands = strstr(commandBuffer,
kKDLMessageCommandSeparator);
if (commands != NULL) {
commands += strlen(kKDLMessageCommandSeparator);
kprintf("initial commands: %s\n", commands);
evaluate_debug_command(commands);
}
}
va_end(tempArgs);
debug_free(commandBuffer);
}
}
static void
stack_trace_trampoline(void*)
{
arch_debug_stack_trace();
}
static void
kernel_debugger_loop(const char* messagePrefix, const char* message,
va_list args, int32 cpu)
@ -802,36 +844,23 @@ kernel_debugger_loop(const char* messagePrefix, const char* message,
}
}
if (has_debugger_command("help")) {
// commands are registered already
if (sCurrentKernelDebuggerMessage != NULL
&& strstr(sCurrentKernelDebuggerMessage,
kKDLMessageCommandSeparator) != NULL) {
// The panic() message specifies commands to execute.
const size_t kCommandBufferSize = 512;
char* commandBuffer = (char*)debug_malloc(kCommandBufferSize);
if (commandBuffer != NULL) {
va_list tempArgs;
va_copy(tempArgs, sCurrentKernelDebuggerMessageArgs);
if (vsnprintf(commandBuffer, kCommandBufferSize,
sCurrentKernelDebuggerMessage, tempArgs)
< (int)kCommandBufferSize) {
const char* commands = strstr(commandBuffer,
kKDLMessageCommandSeparator);
if (commands != NULL) {
commands += strlen(kKDLMessageCommandSeparator);
kprintf("initial commands: %s\n", commands);
evaluate_debug_command(commands);
}
}
va_end(tempArgs);
if (!has_debugger_command("help") || message != NULL) {
// No commands yet or we came here via a panic(). Always print a stack
// trace in these cases.
debug_call_with_fault_handler(gCPU[sDebuggerOnCPU].fault_jump_buffer,
&stack_trace_trampoline, NULL);
}
debug_free(commandBuffer);
}
}
} else {
// no commands yet -- always print a stack trace at least
arch_debug_stack_trace();
if (has_debugger_command("help")) {
// Commands are registered already -- execute panic() commands. Do that
// with paging disabled, so everything is printed, even if the user
// can't use the keyboard.
bool pagingEnabled = blue_screen_paging_enabled();
blue_screen_set_paging(false);
execute_panic_commands();
blue_screen_set_paging(pagingEnabled);
}
int32 continuableLine = -1;
@ -1003,6 +1032,14 @@ cmd_dump_kdl_message(int argc, char** argv)
}
static int
cmd_execute_panic_commands(int argc, char** argv)
{
execute_panic_commands();
return 0;
}
static int
cmd_dump_syslog(int argc, char** argv)
{
@ -1548,6 +1585,12 @@ debug_init_post_vm(kernel_args* args)
"Reprint the message printed when entering KDL",
"\n"
"Reprints the message printed when entering KDL.\n", 0);
add_debugger_command_etc("panic_commands", &cmd_execute_panic_commands,
"Execute commands associated with the panic() that caused "
"entering KDL",
"\n"
"Executes the commands associated with the panic() that caused "
"entering KDL.\n", 0);
debug_builtin_commands_init();