| // user-vector-min.S - Minimal User Vector for General Exceptions |
| // Takes less table space, but does not allow registering new handlers. |
| // $Id: //depot/rel/Foxhill/dot.8/Xtensa/OS/xtos/user-vector-min.S#1 $ |
| |
| // Copyright (c) 2003-2015 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/coreasm.h> |
| #include <xtensa/config/system.h> |
| #include "xtos-internal.h" |
| |
| #if XCHAL_HAVE_EXCEPTIONS && (XCHAL_HAVE_XEA1 || XCHAL_HAVE_XEA2) |
| |
| // Vector code |
| .begin literal_prefix .UserExceptionVector |
| .section .UserExceptionVector.text, "ax" |
| .align 4 |
| .global _UserExceptionVector |
| _UserExceptionVector: |
| # if (((XSHAL_USER_VECTOR_SIZE >= 28) && XCHAL_HAVE_ADDX && XCHAL_HAVE_DENSITY && XCHAL_HAVE_L32R) || (XSHAL_USER_VECTOR_SIZE >= 36) || XSHAL_VECTORS_PACKED) && !defined(XSHAL_ERRATUM_487_FIX) |
| |
| addi a1, a1, -ESF_TOTALSIZE // allocate exception stack frame, etc. |
| s32i a2, a1, UEXC_a2 |
| s32i a3, a1, UEXC_a3 |
| rsr.exccause a2 // get exception cause |
| movi a3, _xtos_min_handler_table |
| bgeui a2, 6, 1f // causes 6 and above map to zero |
| addx4 a3, a2, a3 // index by cause if 1 .. 5 |
| 1: l32i a3, a3, 0 |
| s32i a4, a1, UEXC_a4 |
| jx a3 // jump to cause-specific handler |
| |
| .size _UserExceptionVector, . - _UserExceptionVector |
| .end literal_prefix |
| |
| # else /*vector as small as 12 bytes:*/ |
| |
| addi a1, a1, -ESF_TOTALSIZE // allocate exception stack frame, etc. |
| s32i a2, a1, UEXC_a2 |
| movi a2, _UserExceptionFromVector // load user exception handler address |
| //interlock |
| jx a2 // jump to handler |
| |
| .size _UserExceptionVector, . - _UserExceptionVector |
| .end literal_prefix |
| |
| // Dispatch outside vector: |
| .text |
| .align 4 |
| .global _UserExceptionFromVector |
| _UserExceptionFromVector: |
| hw_erratum_487_fix |
| rsr.exccause a2 // get exception cause |
| s32i a3, a1, UEXC_a3 |
| movi a3, _xtos_min_handler_table |
| bgeui a2, 6, 1f // causes 6 and above map to zero |
| addx4 a3, a2, a3 // index by cause if 1 .. 5 |
| 1: l32i a3, a3, 0 |
| s32i a4, a1, UEXC_a4 |
| jx a3 // jump to cause-specific handler |
| .size _UserExceptionFromVector, . - _UserExceptionFromVector |
| |
| # endif |
| |
| |
| /* |
| * Read-only minimal table of assembly-level exception handlers |
| * for user vectored exceptions. |
| * Only provides entries for SYSCALL, MOVSP, and level-1 interrupt causes. |
| */ |
| .section .rodata, "a" |
| .global _xtos_min_handler_table |
| .align 4 |
| _xtos_min_handler_table: |
| .word xtos_unhandled_exception // 0 Illegal Instruction, and causes > 5 |
| .word _xtos_syscall_handler // 1 SYSCALL Instruction |
| .word xtos_unhandled_exception // 2 Instruction Fetch Error |
| .word xtos_unhandled_exception // 3 Load/Store Error |
| # if XCHAL_HAVE_INTERRUPTS |
| .word _xtos_l1int_handler // 4 Level-1 Interrupt |
| # else |
| .word xtos_unhandled_exception // 4 Level-1 Interrupt (not configured) |
| # endif |
| # if XCHAL_HAVE_WINDOWED && !defined(__XTENSA_CALL0_ABI__) |
| .word _xtos_alloca_handler // 5 Alloca (MOVSP Instruction) |
| # else |
| .word xtos_unhandled_exception // 5 Alloca (MOVSP Instruction) (not configured) |
| # endif |
| .text |
| |
| #endif /* XCHAL_HAVE_EXCEPTIONS */ |
| |