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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.gz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.tar.xz glibc-5046dbb4a7eba5eccfd258f92f4735c9ffc8d069.zip |
Prepare for radical source tree reorganization. zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S b/REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S new file mode 100644 index 0000000000..ff65bbd487 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/sparc/sparc32/____longjmp_chk.S @@ -0,0 +1,113 @@ +/* Copyright (C) 2009-2017 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 + +.section .rodata.str1.1,"aMS",@progbits,1 + .type longjmp_msg,@object +longjmp_msg: + .string "longjmp causes uninitialized stack frame" + .size longjmp_msg, .-longjmp_msg + + .text +ENTRY (____longjmp_chk) + ld ENV(o0,JB_SP), %g5 +#ifdef PTR_DEMANGLE + PTR_DEMANGLE (%g5, %g5, %g4) +#endif + + cmp %sp, %g5 + bleu .Lok_norestore + nop + + save %sp, -80, %sp + cfi_remember_state + cfi_def_cfa_register(%fp) + cfi_window_save + cfi_register(%o7, %i7) + + clr %o0 + add %sp, 64, %o1 + LOADSYSCALL(sigaltstack) + ta 0x10 + bcs .Lok + ld [%sp + 64 + 4], %o2 + andcc %o2, 0x1, %g0 + be .Lfail + ld [%sp + 64 + 0], %o0 + + ld [%sp + 64 + 8], %o1 + add %o0, %o1, %o0 + sub %o0, %g5, %o0 + cmp %o0, %o1 + bgeu .Lok + nop + +.Lfail: +#ifndef PIC + sethi %hi(longjmp_msg), %o0 + or %o0, %lo(longjmp_msg), %o0 +#else + SETUP_PIC_REG(l7) + sethi %gdop_hix22(longjmp_msg), %o0 + xor %o0, %gdop_lox10(longjmp_msg), %o0 + ld [%l7 + %o0], %o0, %gdop(longjmp_msg) +#endif + call HIDDEN_JUMPTARGET(__fortify_fail) + nop + +.Lok: + restore + cfi_restore_state + +.Lok_norestore: + ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ +#ifdef PTR_DEMANGLE + PTR_DEMANGLE2 (%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: + + 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), %g1 /* Set return PC. */ + PTR_DEMANGLE2 (%i7, %g1, %g4) +#else + ld ENV(g1,JB_PC), %i7 /* Set return PC. */ +#endif + mov %g5, %fp + jmp %i7 + 8 + restore %g2, 0, %o0 /* Restore values from above register frame. */ + +END(____longjmp_chk) |