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Diffstat (limited to 'REORG.TODO/sysdeps/sparc/sparc32/__longjmp.S')
| -rw-r--r-- | REORG.TODO/sysdeps/sparc/sparc32/__longjmp.S | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/sparc/sparc32/__longjmp.S b/REORG.TODO/sysdeps/sparc/sparc32/__longjmp.S new file mode 100644 index 0000000000..2cfb6c23e7 --- /dev/null +++ b/REORG.TODO/sysdeps/sparc/sparc32/__longjmp.S @@ -0,0 +1,93 @@ +/* Copyright (C) 1991-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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> +#define ENV(base,reg) [%base + (reg * 4)] +#define ST_FLUSH_WINDOWS 3 + +ENTRY(__longjmp) + /* Store our arguments in global registers so we can still + use them while unwinding frames and their register windows. */ + + ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ +#ifdef PTR_DEMANGLE + PTR_DEMANGLE (%g3, %g3, %g4) +#endif + mov %o0, %g1 /* ENV in %g1 */ + orcc %o1, %g0, %g2 /* VAL in %g2 */ + be,a 0f /* Branch if zero; else skip delay slot. */ + mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ +0: + xor %fp, %g3, %o0 + add %fp, 512, %o1 + andncc %o0, 4095, %o0 + bne LOC(thread) + cmp %o1, %g3 + bl LOC(thread) + + /* Now we will loop, unwinding the register windows up the stack + until the restored %fp value matches the target value in %g3. */ + +LOC(loop): + cmp %fp, %g3 /* Have we reached the target frame? */ + bl,a LOC(loop) /* Loop while current fp is below target. */ + restore /* Unwind register window in delay slot. */ + be,a LOC(found) /* Better have hit it exactly. */ + ld ENV(g1,JB_SP), %o0 /* Delay slot: extract target SP. */ + +LOC(thread): + save %sp, -96, %sp + /* + * Do a "flush register windows trap". The trap handler in the + * kernel writes all the register windows to their stack slots, and + * marks them all as invalid (needing to be sucked up from the + * stack when used). This ensures that all information needed to + * unwind to these callers is in memory, not in the register + * windows. + */ + ta ST_FLUSH_WINDOWS +#ifdef PTR_DEMANGLE + ld ENV(g1,JB_PC), %g5 /* Set return PC. */ + ld ENV(g1,JB_SP), %g1 /* Set saved SP on restore below. */ + PTR_DEMANGLE2 (%i7, %g5, %g4) + PTR_DEMANGLE2 (%fp, %g1, %g4) +#else + ld ENV(g1,JB_PC), %i7 /* Set return PC. */ + ld ENV(g1,JB_SP), %fp /* Set saved SP on restore below. */ +#endif + jmp %i7 + 8 + restore %g2, 0, %o0 /* Restore values from above register frame. */ + +LOC(found): + /* We have unwound register windows so %fp matches the target. */ +#ifdef PTR_DEMANGLE + PTR_DEMANGLE2 (%sp, %o0, %g4) +#else + mov %o0, %sp /* OK, install new SP. */ +#endif + +LOC(sp_ok): + ld ENV(g1,JB_PC), %o0 /* Extract target return PC. */ +#ifdef PTR_DEMANGLE + PTR_DEMANGLE2 (%o0, %o0, %g4) +#endif + jmp %o0 + 8 /* Return there. */ + mov %g2, %o0 /* Delay slot: set return value. */ + +END(__longjmp) |