+2004-09-01 David Mosberger <davidm@hpl.hp.com>
+
+ * sysdeps/unix/sysv/linux/ia64/jmpbuf-unwind.h
+ (__libc_unwind_longjmp): Delete macro and declare as function.
+ * sysdeps/unix/sysv/linux/ia64/Makefile (sysdep_routines): Mention
+ __ia64_longjmp, sigstack_longjmp, and __sigstack_longjmp for
+ nptl directory.
+ * sysdeps/unix/sysv/linux/ia64/__ia64_longjmp.S: New file.
+ * sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c: New file.
+ * sysdeps/unix/sysv/linux/ia64/unwind_longjmp.c: New file.
+
2004-09-12 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/pthread.h: Make rwlock prototypes available also
--- /dev/null
+ifeq ($(subdir),nptl)
+libpthread-sysdep_routines += __ia64_longjmp unwind_longjmp __sigstack_longjmp
+endif
--- /dev/null
+/* Copyright (C) 1999, 2000, 2001, 2004 Free Software Foundation, Inc.
+ Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sysdep.h>
+#include <features.h>
+
+LEAF(__ia64_flush_rbs)
+ flushrs
+ mov r9 = ar.rsc // 12 cyc latency
+ ;;
+ mov r8 = ar.bsp // 12 cyc latency
+ ;;
+ and r16 = ~0x3, r9 // clear ar.rsc.mode
+ ;;
+ mov ar.rsc = r16 // put RSE into enforced-lazy mode
+ ;;
+ mov r10 = ar.rnat // 5 cyc latency
+ ret
+END(__ia64_flush_rbs)
+
+
+# define pPos p6 /* is rotate count positive? */
+# define pNeg p7 /* is rotate count negative? */
+
+/* __ia64_longjmp(__jmp_buf buf, int val, long rnat, long rsc) */
+
+
+LEAF(__ia64_longjmp)
+ alloc r8=ar.pfs,4,0,0,0
+ add r2=0x98,in0 // r2 <- &jmpbuf.orig_jmp_buf_addr
+ add r3=0x88,in0 // r3 <- &jmpbuf.ar_bsp
+ ;;
+ ld8 r8=[r2] // r8 <- orig_jmp_buf_addr
+ ld8 r23=[r3],8 // r23 <- jmpbuf.ar_bsp
+ mov r2=in0
+ ;;
+ //
+ // Note: we need to redo the "flushrs" here even though it's
+ // already been done by __ia64_flush_rbs. It is needed to
+ // ensure that ar.bspstore == ar.bsp.
+ //
+ flushrs // flush dirty regs to backing store
+ ld8 r25=[r3] // r25 <- jmpbuf.ar_unat
+ sub r8=r8,in0 // r8 <- &orig_jmpbuf - &jmpbuf
+ ;;
+ add r3=8,in0 // r3 <- &jmpbuf.r1
+ extr.u r8=r8,3,6 // r8 <- (&orig_jmpbuf - &jmpbuf)/8 & 0x3f
+ ;;
+ cmp.lt pNeg,pPos=r8,r0
+ ;;
+(pPos) mov r16=r8
+(pNeg) add r16=64,r8
+(pPos) sub r17=64,r8
+(pNeg) sub r17=r0,r8
+ ;;
+ shr.u r8=r25,r16
+ shl r9=r25,r17
+ ;;
+ or r25=r8,r9
+ ;;
+ mov ar.unat=r25 // setup ar.unat (NaT bits for r1, r4-r7, and r12)
+ ;;
+ ld8.fill.nta sp=[r2],16 // r12 (sp)
+ ld8.fill.nta gp=[r3],16 // r1 (gp)
+ dep r11=-1,r23,3,6 // r11 <- ia64_rse_rnat_addr(jmpbuf.ar_bsp)
+ ;;
+ ld8.nta r16=[r2],16 // caller's unat
+ ld8.nta r17=[r3],16 // fpsr
+ ;;
+ ld8.fill.nta r4=[r2],16 // r4
+ ld8.fill.nta r5=[r3],16 // r5 (gp)
+ ;;
+ ld8.fill.nta r6=[r2],16 // r6
+ ld8.fill.nta r7=[r3],16 // r7
+ ;;
+ mov ar.unat=r16 // restore caller's unat
+ mov ar.fpsr=r17 // restore fpsr
+ ;;
+ ld8.nta r16=[r2],16 // b0
+ ld8.nta r17=[r3],16 // b1
+ ;;
+ mov ar.bspstore=r23 // restore ar.bspstore
+ ld8.nta r18=[r2],16 // b2
+ ;;
+ mov ar.rnat=in2 // restore ar.rnat
+ ld8.nta r19=[r3],16 // b3
+ ;;
+ ld8.nta r20=[r2],16 // b4
+ ld8.nta r21=[r3],16 // b5
+ ;;
+ ld8.nta r11=[r2],16 // ar.pfs
+ ld8.nta r22=[r3],56 // ar.lc
+ ;;
+ ld8.nta r24=[r2],32 // pr
+ mov ar.rsc=in3 // restore ar.rsc
+ mov b0=r16
+ ;;
+ ldf.fill.nta f2=[r2],32
+ ldf.fill.nta f3=[r3],32
+ mov b1=r17
+ ;;
+ ldf.fill.nta f4=[r2],32
+ ldf.fill.nta f5=[r3],32
+ mov b2=r18
+ ;;
+ ldf.fill.nta f16=[r2],32
+ ldf.fill.nta f17=[r3],32
+ mov b3=r19
+ ;;
+ ldf.fill.nta f18=[r2],32
+ ldf.fill.nta f19=[r3],32
+ mov b4=r20
+ ;;
+ ldf.fill.nta f20=[r2],32
+ ldf.fill.nta f21=[r3],32
+ mov b5=r21
+ ;;
+ ldf.fill.nta f22=[r2],32
+ ldf.fill.nta f23=[r3],32
+ mov ar.lc=r22
+ ;;
+ ldf.fill.nta f24=[r2],32
+ ldf.fill.nta f25=[r3],32
+ cmp.eq p8,p9=0,in1
+ ;;
+ ldf.fill.nta f26=[r2],32
+ ldf.fill.nta f27=[r3],32
+ mov ar.pfs=r11
+ ;;
+ ldf.fill.nta f28=[r2],32
+ ldf.fill.nta f29=[r3],32
+(p8) mov r8=1
+ ;;
+ ldf.fill.nta f30=[r2]
+ ldf.fill.nta f31=[r3]
+(p9) mov r8=in1
+
+ invala // virt. -> phys. regnum mapping may change
+ mov pr=r24,-1
+ ret
+END(__ia64_longjmp)
--- /dev/null
+/* Copyright (C) 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+/* 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 constrast, 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_DECL (err);
+ (void) INTERNAL_SYSCALL (sigaltstack, err, 2, 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);
+}
#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
((uintptr_t)(_address) - (_adj) < (uintptr_t)(((long *)_jmpbuf)[0]) - (_adj))
-/* We use the normal lobngjmp for unwinding. */
-#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
+/* We use a longjmp() which can cross from the alternate signal-stack
+ to the normal stack. */
+extern void __libc_unwind_longjmp (sigjmp_buf env, int val)
+ __attribute__ ((noreturn));
+hidden_proto (__libc_unwind_longjmp)
--- /dev/null
+/* Copyright (C) 1991,92,94,95,97,98,2000,02,04 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <stddef.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <pthreadP.h>
+#include <jmpbuf-unwind.h>
+
+extern void __sigstack_longjmp (__jmp_buf, int)
+ __attribute__ ((noreturn));
+
+/* Like __libc_siglongjmp(), but safe for crossing from alternate
+ signal stack to normal stack. Needed by NPTL. */
+void
+__libc_unwind_longjmp (sigjmp_buf env, int val)
+{
+ /* Perform any cleanups needed by the frames being unwound. */
+ __pthread_cleanup_upto (env->__jmpbuf, CURRENT_STACK_FRAME);
+
+ if (env[0].__mask_was_saved)
+ /* Restore the saved signal mask. */
+ (void) __sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
+ (sigset_t *) NULL);
+
+ /* Call the machine-dependent function to restore machine state. */
+ __sigstack_longjmp (env[0].__jmpbuf, val ?: 1);
+}
+hidden_def (__libc_unwind_longjmp)
projects / external / glibc.git / commitdiff