| // debug-vector.S -- Debug Exception Vector |
| // $Id: //depot/rel/Foxhill/dot.8/Xtensa/OS/xtos/debug-vector.S#1 $ |
| |
| // Copyright (c) 2003-2013 Tensilica Inc. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining |
| // a copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to |
| // permit persons to whom the Software is furnished to do so, subject to |
| // the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| #include <xtensa/xtensa-versions.h> |
| #include <xtensa/coreasm.h> |
| #include <xtensa/simcall.h> |
| |
| #if XCHAL_HAVE_DEBUG && XCHAL_HAVE_EXCEPTIONS |
| |
| // This code goes at the debug exception vector |
| |
| .begin literal_prefix .DebugExceptionVector |
| .section .DebugExceptionVector.text, "ax" |
| .align 4 |
| .global _DebugExceptionVector |
| _DebugExceptionVector: |
| |
| # if defined(SIMULATOR) || XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RE_2013_2 /* SIMCALL is NOP in hw? */ |
| // In the simulator (ISS), let the debugger (if any is attached) |
| // handle the debug exception, else simply stop the simulation: |
| // |
| writesr excsave XCHAL_DEBUGLEVEL a2 // save a2 where simulator expects it |
| movi a2, SYS_gdb_enter_sktloop |
| simcall // have ISS handle the debug exception |
| # endif |
| # ifndef SIMULATOR |
| // For hardware, this code does not handle debug exceptions. |
| // To implement a target-side debug monitor, replace this |
| // vector with a real one that uses target-specific facilities |
| // to communicate with the debugger. |
| // |
| 1: |
| # if XCHAL_HAVE_INTERRUPTS |
| //waiti XCHAL_DEBUGLEVEL // unexpected debug exception, loop in low-power mode |
| # endif |
| j 1b // infinite loop - unexpected debug exception |
| # endif /*!SIMULATOR*/ |
| |
| .end literal_prefix |
| .size _DebugExceptionVector, . - _DebugExceptionVector |
| |
| #endif /* XCHAL_HAVE_DEBUG && XCHAL_HAVE_EXCEPTIONS */ |
| |
