diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c b/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c deleted file mode 100644 index c9539befe7..0000000000 --- a/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c +++ /dev/null @@ -1,165 +0,0 @@ -/* Copyright (C) 2004-2024 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 - <https://www.gnu.org/licenses/>. */ - -/* The public __longjmp() implementation is limited to jumping within - the same stack. That is, in general it is not possible to use this - __longjmp() implementation to cross from one stack to another. - In contrast, the __sigstack_longjmp() implemented here allows - crossing from the alternate signal stack to the normal stack - as a special case. */ - -#include <assert.h> -#include <setjmp.h> -#include <signal.h> -#include <stdint.h> -#include <stdlib.h> - -#include <sysdep.h> -#include <sys/rse.h> - -#define JB_SP 0 -#define JB_BSP 17 - -struct rbs_flush_values - { - unsigned long bsp; - unsigned long rsc; - unsigned long rnat; - }; - -extern struct rbs_flush_values __ia64_flush_rbs (void); -extern void __ia64_longjmp (__jmp_buf buf, int val, long rnat, long rsc) - __attribute__ ((__noreturn__)); - -static void -copy_rbs (unsigned long *dst, unsigned long *dst_end, unsigned long dst_rnat, - unsigned long *src, unsigned long *src_end, - unsigned long current_rnat) -{ - unsigned long dst_slot, src_rnat = 0, src_slot, *src_rnat_addr, nat_bit; - int first_time = 1; - - while (dst < dst_end) - { - dst_slot = ia64_rse_slot_num (dst); - if (dst_slot == 63) - { - *dst++ = dst_rnat; - dst_rnat = 0; - } - else - { - /* read source value, including NaT bit: */ - src_slot = ia64_rse_slot_num (src); - if (src_slot == 63) - { - /* skip src RNaT slot */ - ++src; - src_slot = 0; - } - if (first_time || src_slot == 0) - { - first_time = 0; - src_rnat_addr = ia64_rse_rnat_addr (src); - if (src_rnat_addr < src_end) - src_rnat = *src_rnat_addr; - else - src_rnat = current_rnat; - } - nat_bit = (src_rnat >> src_slot) & 1; - - assert (src < src_end); - - *dst++ = *src++; - if (nat_bit) - dst_rnat |= (1UL << dst_slot); - else - dst_rnat &= ~(1UL << dst_slot); - } - } - dst_slot = ia64_rse_slot_num (dst); - if (dst_slot > 0) - *ia64_rse_rnat_addr (dst) = dst_rnat; -} - -void -__sigstack_longjmp (__jmp_buf buf, int val) -{ - unsigned long *rbs_base, *bsp, *bspstore, *jb_bsp, jb_sp, ss_sp; - unsigned long ndirty, rnat, load_rnat, *jb_rnat_addr; - struct sigcontext *sc; - stack_t stk; - struct rbs_flush_values c; - - /* put RSE into enforced-lazy mode and return current bsp/rsc/rnat: */ - c = __ia64_flush_rbs (); - - jb_sp = ((unsigned long *) buf)[JB_SP]; - jb_bsp = ((unsigned long **) buf)[JB_BSP]; - - INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &stk); - - ss_sp = (unsigned long) stk.ss_sp; - jb_rnat_addr = ia64_rse_rnat_addr (jb_bsp); - - if ((stk.ss_flags & SS_ONSTACK) == 0 || jb_sp - ss_sp < stk.ss_size) - /* Normal non-stack-crossing longjmp; if the RNaT slot for the bsp - saved in the jump-buffer is the same as the one for the current - BSP, use the current AR.RNAT value, otherwise, load it from the - jump-buffer's RNaT-slot. */ - load_rnat = (ia64_rse_rnat_addr ((unsigned long *) c.bsp) != jb_rnat_addr); - else - { - /* If we are on the alternate signal-stack and the jump-buffer - lies outside the signal-stack, we may need to copy back the - dirty partition which was torn off and saved on the - signal-stack when the signal was delivered. - - Caveat: we assume that the top of the alternate signal-stack - stores the sigcontext structure of the signal that - caused the switch to the signal-stack. This should - be a fairly safe assumption but the kernel _could_ - do things differently.. */ - sc = ((struct sigcontext *) ((ss_sp + stk.ss_size) & -16) - 1); - - /* As a sanity-check, verify that the register-backing-store base - of the alternate signal-stack is where we expect it. */ - rbs_base = (unsigned long *) - ((ss_sp + sizeof (long) - 1) & -sizeof (long)); - - assert ((unsigned long) rbs_base == sc->sc_rbs_base); - - ndirty = ia64_rse_num_regs (rbs_base, rbs_base + (sc->sc_loadrs >> 19)); - bsp = (unsigned long *) sc->sc_ar_bsp; - bspstore = ia64_rse_skip_regs (bsp, -ndirty); - - if (bspstore < jb_bsp) - /* AR.BSPSTORE at the time of the signal was below the value - of AR.BSP saved in the jump-buffer => copy the missing - portion from the torn off dirty partition which got saved - on the alternate signal-stack. */ - copy_rbs (bspstore, jb_bsp, sc->sc_ar_rnat, - rbs_base, (unsigned long *) c.bsp, c.rnat); - - load_rnat = 1; - } - if (load_rnat) - rnat = *jb_rnat_addr; - else - rnat = c.rnat; - __ia64_longjmp (buf, val, rnat, c.rsc); -} |