| /* Copyright (C) 2009-2014 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 <sigaltstack-offsets.h> |
| |
| .section .rodata.str1.8,"aMS",@progbits,1 |
| .align 8 |
| .LC0: |
| .string "longjmp causes uninitialized stack frame" |
| |
| .section .sdata,"aws",@progbits |
| .align 8 |
| .type longjmp_msg,@object |
| longjmp_msg: |
| data8 .LC0 |
| .size longjmp_msg, .-longjmp_msg |
| |
| #define __longjmp ____longjmp_chk |
| |
| /* We use 32 bytes (rather than sizeof(stack_t)) so that we keep the stack |
| properly aligned. But we still want a sanity check to make sure 32 is |
| actually enough. */ |
| #define STACK_SPACE ((sizeSS + 31) & -32) |
| |
| /* Check the stack pointer held in the jumpbuf. Make sure it's in either the |
| current stack (r12) or in the signal stack. */ |
| #define CHECK_RSP \ |
| ld8 loc0 = [in0]; \ |
| ;; \ |
| /* First see if target stack is within current one. */ \ |
| cmp.ltu p0, p8 = loc0, r12; \ |
| (p8) br.cond.dptk.many .Lok; \ |
| \ |
| /* Check if it's an alternative signal stack. */ \ |
| mov out0 = r0; \ |
| add out1 = -STACK_SPACE, r12; \ |
| ;; \ |
| mov r12 = out1; \ |
| DO_CALL_VIA_BREAK (SYS_ify (sigaltstack)); \ |
| ;; \ |
| /* If the syscall failed, then assume it's OK. */ \ |
| cmp.eq p8, p0 = -1, r10; \ |
| (p8) br.cond.spnt .Lok; \ |
| /* Move stack_t into regs. */ \ |
| add r14 = oSS_FLAGS, r12; /* ss_flags */ \ |
| add r15 = oSS_SIZE, r12; /* ss_size */ \ |
| ld8 r16 = [r12]; /* ss_sp */ \ |
| ;; \ |
| ld4 r17 = [r14]; /* ss_flags */ \ |
| ld8 r18 = [r15]; /* ss_size */ \ |
| ;; \ |
| sub r19 = r16, r18; /* sp - size */ \ |
| /* See if we're currently on the altstack. */ \ |
| tbit.nz p0, p8 = r17, 0; /* SS_ONSTACK */ \ |
| (p8) br.cond.spnt .Lfail; \ |
| /* Verify target is within alternative stack. */ \ |
| cmp.gtu p7, p0 = loc0, r16; \ |
| (p7) br.cond.spnt .Lfail; \ |
| ;; \ |
| cmp.ltu p0, p8 = loc0, r19; \ |
| (p8) br.cond.sptk.many .Lok; \ |
| ;; \ |
| \ |
| /* Still here? Abort! */ \ |
| .Lfail: \ |
| add r12 = STACK_SPACE, r12; \ |
| addl loc0 = @ltoffx(longjmp_msg#), r1;; \ |
| ld8.mov loc0 = [loc0], longjmp_msg#;; \ |
| ld8 out0 = [loc0]; \ |
| br.call.sptk.many b0 = HIDDEN_JUMPTARGET(__fortify_fail)#;; \ |
| .Lok: \ |
| add r12 = STACK_SPACE, r12; |
| |
| #include "__longjmp.S" |
