| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <jmpbuf-offsets.h> |
| #include <asm-syntax.h> |
| #include <arch/spr_def.h> |
| |
| /* PL to return to via iret in longjmp */ |
| #define RETURN_PL 0 |
| |
| .text |
| ENTRY (__longjmp) |
| FEEDBACK_ENTER(__longjmp) |
| |
| #define RESTORE(r) { LD r, r0 ; ADDI_PTR r0, r0, REGSIZE } |
| FOR_EACH_CALLEE_SAVED_REG(RESTORE) |
| |
| /* Make longjmp(buf, 0) return "1" instead. |
| At the same time, construct our iret context; we set ICS so |
| we can validly load EX_CONTEXT for iret without being |
| interrupted halfway through. */ |
| { |
| LD r2, r0 /* retrieve ICS bit from jmp_buf */ |
| movei r3, 1 |
| CMPEQI r0, r1, 0 |
| } |
| { |
| mtspr INTERRUPT_CRITICAL_SECTION, r3 |
| shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT |
| } |
| { |
| mtspr EX_CONTEXT_0_0, lr |
| ori r2, r2, RETURN_PL |
| } |
| { |
| or r0, r1, r0 |
| mtspr EX_CONTEXT_0_1, r2 |
| } |
| iret |
| jrp lr /* Keep the backtracer happy. */ |
| END (__longjmp) |
