diff options
Diffstat (limited to 'REORG.TODO/sysdeps/tile/__longjmp.S')
| -rw-r--r-- | REORG.TODO/sysdeps/tile/__longjmp.S | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/tile/__longjmp.S b/REORG.TODO/sysdeps/tile/__longjmp.S new file mode 100644 index 0000000000..c9902b1b31 --- /dev/null +++ b/REORG.TODO/sysdeps/tile/__longjmp.S @@ -0,0 +1,57 @@ +/* Copyright (C) 2011-2017 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) |