diff options
Diffstat (limited to 'ports/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S')
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S b/ports/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S new file mode 100644 index 0000000000..c5fe5c19fb --- /dev/null +++ b/ports/sysdeps/unix/sysv/linux/alpha/____longjmp_chk.S @@ -0,0 +1,145 @@ +/* Copyright (C) 1992, 1994, 1997, 2006, 2010, 2011 + 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> + + + .section .rodata.str1.1,"aMS",@progbits,1 + .type longjmp_msg,@object +longjmp_msg: + .string "longjmp causes uninitialized stack frame" + .size longjmp_msg, .-longjmp_msg + + +/* Jump to the position specified by ENV, causing the + setjmp call there to return VAL, or 1 if VAL is 0. + void __longjmp (__jmp_buf env, int val). */ + .text + .align 4 + .globl ____longjmp_chk + .type ____longjmp_chk, @function + .usepv ____longjmp_chk, std + + cfi_startproc +____longjmp_chk: + ldgp gp, 0(pv) +#ifdef PROF + .set noat + lda AT, _mcount + jsr AT, (AT), _mcount + .set at +#endif + + ldq s2, JB_PC*8(a0) + mov a0, s0 + ldq fp, JB_FP*8(a0) + mov a1, s1 + ldq s3, JB_SP*8(a0) + cmoveq s1, 1, s1 + +#ifdef PTR_DEMANGLE + PTR_DEMANGLE(s2, t1) + PTR_DEMANGLE2(s3, t1) + PTR_DEMANGLE2(fp, t1) +#endif + /* ??? While this is a proper test for detecting a longjmp to an + invalid frame within any given stack, the main thread stack is + located *below* almost everything in the address space. Which + means that the test at Lfail vs the signal stack will almost + certainly never pass. We ought bounds check top and bottom of + the current thread's stack. */ + cmpule s3, sp, t1 + bne t1, $Lfail + + .align 4 +$Lok: + mov s0, a0 + mov s1, v0 + mov s3, t0 + mov s2, ra + cfi_remember_state + cfi_def_cfa(a0, 0) + cfi_register(sp, t0) + cfi_offset(s0, JB_S0*8) + cfi_offset(s1, JB_S1*8) + cfi_offset(s2, JB_S2*8) + cfi_offset(s3, JB_S3*8) + cfi_offset(s4, JB_S4*8) + cfi_offset(s5, JB_S5*8) + cfi_offset(s3, JB_S3*8) + cfi_offset($f2, JB_F2*8) + cfi_offset($f3, JB_F3*8) + cfi_offset($f4, JB_F4*8) + cfi_offset($f5, JB_F5*8) + cfi_offset($f6, JB_F6*8) + cfi_offset($f7, JB_F7*8) + cfi_offset($f8, JB_F8*8) + cfi_offset($f9, JB_F9*8) + ldq s0, JB_S0*8(a0) + ldq s1, JB_S1*8(a0) + ldq s2, JB_S2*8(a0) + ldq s3, JB_S3*8(a0) + ldq s4, JB_S4*8(a0) + ldq s5, JB_S5*8(a0) + ldt $f2, JB_F2*8(a0) + ldt $f3, JB_F3*8(a0) + ldt $f4, JB_F4*8(a0) + ldt $f5, JB_F5*8(a0) + ldt $f6, JB_F6*8(a0) + ldt $f7, JB_F7*8(a0) + ldt $f8, JB_F8*8(a0) + ldt $f9, JB_F9*8(a0) + mov t0, sp + ret + + .align 4 +$Lfail: + cfi_restore_state + lda v0, __NR_sigaltstack + lda a0, 0 + lda a1, -32(sp) + lda sp, -32(sp) + cfi_adjust_cfa_offset(32) + callsys + ldq t0, 0(sp) /* ss_sp */ + ldl t1, 8(sp) /* ss_flags */ + ldq t2, 16(sp) /* ss_size */ + lda sp, 32(sp) + cfi_adjust_cfa_offset(-32) + + /* Without working sigaltstack we cannot perform the test. */ + bne a3, $Lok + + addq t0, t2, t0 /* t0 = ss_sp + ss_size */ + subq t0, s3, t0 /* t0 = (ss_sp + ss_size) - new_sp */ + cmpule t2, t0, t0 /* t0 = (t0 >= ss_size) */ + and t0, t1, t0 /* t0 = (t0 >= ss_size) & (ss_flags & SS_ONSTACK) */ + bne t0, $Lok + + ldah a0, longjmp_msg(gp) !gprelhigh + lda a0, longjmp_msg(a0) !gprellow +#ifdef PIC + jsr ra, HIDDEN_JUMPTARGET(__fortify_fail) +#else + bsr ra, HIDDEN_JUMPTARGET(__fortify_fail) !samegp +#endif + bugchk + + cfi_endproc + .size ____longjmp_chk, .-____longjmp_chk |