Hi all,
the attached patch adds unwind support for aarch64-*-freebsd*.
John used to catch unwind tests in ada.
So far it bootstraps and I see no regressions.
is this ok for trunk?
TIA,
Andreas
2017-02-16 John Marino <gnu...@marino.st>
* config/aarch64/freebsd-unwind.h: New file.
* config.host: Add aarch64-*-freebsd unwinder.
Index: config.host
===================================================================
--- config.host (revision 245512)
+++ config.host (working copy)
@@ -340,7 +340,7 @@
extra_parts="$extra_parts crtfastmath.o"
tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
- md_unwind_header=aarch64/aarch64-unwind.h
+ md_unwind_header=aarch64/freebsd-unwind.h
;;
aarch64*-*-linux*)
extra_parts="$extra_parts crtfastmath.o"
Index: config/aarch64/freebsd-unwind.h
===================================================================
--- config/aarch64/freebsd-unwind.h (nonexistent)
+++ config/aarch64/freebsd-unwind.h (working copy)
@@ -0,0 +1,108 @@
+/* DWARF2 EH unwinding support for FreeBSD/ARM64 (aarch64).
+ Copyright (C) 2017 Free Software Foundation, Inc.
+ Contributed by John Marino <gnu...@marino.st>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC 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 General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
+
+/* Identify a signal frame, and set the frame state data appropriately.
+ See unwind-dw2.c for the structs. */
+
+/* Always include AArch64 unwinder header file. */
+#include "config/aarch64/aarch64-unwind.h"
+
+#include <sys/types.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/ucontext.h>
+#include <machine/frame.h>
+#include <sys/user.h>
+#include <sys/sysctl.h>
+
+#define REG_NAME(reg) mc_gpregs.gp_## reg
+#define XREG(num) mc_gpregs.gp_x[num]
+#define DARC __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
+
+#define MD_FALLBACK_FRAME_STATE_FOR aarch64_freebsd_fallback_frame_state
+
+static int
+aarch64_outside_sigtramp_range (unsigned char *pc)
+{
+ static int sigtramp_range_determined = 0;
+ static unsigned char *sigtramp_start, *sigtramp_end;
+
+ if (sigtramp_range_determined == 0)
+ {
+ struct kinfo_sigtramp kst = {0};
+ size_t len = sizeof (kst);
+ int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_SIGTRAMP, getpid() };
+
+ sigtramp_range_determined = 1;
+ if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
+ {
+ sigtramp_range_determined = 2;
+ sigtramp_start = kst.ksigtramp_start;
+ sigtramp_end = kst.ksigtramp_end;
+ }
+ }
+ if (sigtramp_range_determined < 2) /* sysctl failed if < 2 */
+ return 1;
+
+ return (pc < sigtramp_start || pc >= sigtramp_end);
+}
+
+static _Unwind_Reason_Code
+aarch64_freebsd_fallback_frame_state
+(struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ int n;
+ struct sigframe *sf;
+ mcontext_t *sc;
+ _Unwind_Ptr new_cfa;
+
+ if (aarch64_outside_sigtramp_range(context->ra))
+ return _URC_END_OF_STACK;
+
+ sf = (struct sigframe *) context->cfa;
+ sc = &sf->sf_uc.uc_mcontext;
+
+ new_cfa = (_Unwind_Ptr) sc;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__;
+ fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
+
+ for (n = 0; n < 32; n++)
+ fs->regs.reg[n].how = REG_SAVED_OFFSET;
+
+ for (n = 0; n < 30; n++)
+ fs->regs.reg[n].loc.offset = (_Unwind_Ptr) &(sc->XREG(n)) - new_cfa;
+
+ fs->regs.reg[30].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(lr)) - new_cfa;
+ fs->regs.reg[31].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(sp)) - new_cfa;
+
+ fs->regs.reg[DARC].how = REG_SAVED_OFFSET;
+ fs->regs.reg[DARC].loc.offset = (_Unwind_Ptr) &(sc->REG_NAME(elr)) - new_cfa;
+
+ fs->retaddr_column = DARC;
+ fs->signal_frame = 1;
+
+ return _URC_NO_REASON;
+}
