Reimplemented the gdb stub support for the 'g' command (read registers):

* Added an arch_debug_gdb_get_registers() interface that is supposed to provide
  the register values in the format expected by gdb and implemented it for x86.
* Reimplemented gdb_regreply() to use that. Also made it buffer overflow safe.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41880 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/debug.h

@@ -50,6 +50,8 @@ bool arch_is_debug_variable_defined(const char* variableName);
 status_t arch_set_debug_variable(const char* variableName, uint64 value);
 status_t arch_get_debug_variable(const char* variableName, uint64* value);
 
+ssize_t arch_debug_gdb_get_registers(char* buffer, size_t bufferSize);
+
 #ifdef __cplusplus
 }
 #endif