/usr/src/gcc-4.9/debian/patches/kfreebsd-unwind.diff is in gcc-4.9-source 4.9.3-13ubuntu2.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 | # DP: DWARF2 EH unwinding support for AMD x86-64 and x86 KFreeBSD.
Index: b/src/libgcc/config.host
===================================================================
--- a/src/libgcc/config.host
+++ b/src/libgcc/config.host
@@ -567,7 +567,12 @@ i[34567]86-*-linux*)
tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
md_unwind_header=i386/linux-unwind.h
;;
-i[34567]86-*-kfreebsd*-gnu | i[34567]86-*-knetbsd*-gnu | i[34567]86-*-gnu* | i[34567]86-*-kopensolaris*-gnu)
+i[34567]86-*-kfreebsd*-gnu)
+ extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
+ tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
+ md_unwind_header=i386/freebsd-unwind.h
+ ;;
+i[34567]86-*-knetbsd*-gnu | i[34567]86-*-gnu* | i[34567]86-*-kopensolaris*-gnu)
extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
;;
@@ -576,7 +581,12 @@ x86_64-*-linux*)
tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
md_unwind_header=i386/linux-unwind.h
;;
-x86_64-*-kfreebsd*-gnu | x86_64-*-knetbsd*-gnu)
+x86_64-*-kfreebsd*-gnu)
+ extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
+ tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
+ md_unwind_header=i386/freebsd-unwind.h
+ ;;
+x86_64-*-knetbsd*-gnu)
extra_parts="$extra_parts crtprec32.o crtprec64.o crtprec80.o crtfastmath.o"
tmake_file="${tmake_file} i386/t-crtpc i386/t-crtfm i386/t-crtstuff t-dfprules"
;;
Index: b/src/libgcc/config/i386/freebsd-unwind.h
===================================================================
--- /dev/null
+++ b/src/libgcc/config/i386/freebsd-unwind.h
@@ -0,0 +1,190 @@
+/* DWARF2 EH unwinding support for AMD x86-64 and x86.
+ Copyright (C) 2004-2013 Free Software Foundation, Inc.
+
+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/>. */
+
+/* Do code reading to identify a signal frame, and set the frame
+ state data appropriately. See unwind-dw2.c for the structs.
+ Don't use this at all if inhibit_libc is used. */
+
+#ifndef inhibit_libc
+
+#include <signal.h>
+#include <sys/ucontext.h>
+#include <machine/sigframe.h>
+
+#ifdef __x86_64__
+
+#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fb_fallback_frame_state
+
+static _Unwind_Reason_Code
+x86_64_fb_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ unsigned int *pc = context->ra;
+ struct sigframe *sf;
+ long new_cfa;
+
+/* sys/amd64/amd64/sigtramp.S:
+
+ 48 8d 7c 24 10 lea 0x10(%rsp),%rdi
+ 6a 00 pushq $0x0
+ 48 c7 c0 a1 01 00 00 mov $0x1a1,%rax
+ 0f 05 syscall
+*/
+
+ if ( (pc[0] == 0x247c8d48U)
+ && (pc[1] == 0x48006a10U)
+ && (pc[2] == 0x01a1c0c7U)
+ && (pc[3] == 0x050f0000U))
+ {
+ sf = (struct sigframe *) context->cfa;
+ }
+ else
+ return _URC_END_OF_STACK;
+
+ new_cfa = sf->sf_uc.uc_mcontext.mc_rsp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ /* Register 7 is rsp */
+ fs->regs.cfa_reg = 7;
+ fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+
+ /* The SVR4 register numbering macros aren't usable in libgcc. */
+ fs->regs.reg[0].how = REG_SAVED_OFFSET;
+ fs->regs.reg[0].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rax - new_cfa;
+ fs->regs.reg[1].how = REG_SAVED_OFFSET;
+ fs->regs.reg[1].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rdx - new_cfa;
+ fs->regs.reg[2].how = REG_SAVED_OFFSET;
+ fs->regs.reg[2].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rcx - new_cfa;
+ fs->regs.reg[3].how = REG_SAVED_OFFSET;
+ fs->regs.reg[3].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rbx - new_cfa;
+ fs->regs.reg[4].how = REG_SAVED_OFFSET;
+ fs->regs.reg[4].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rsi - new_cfa;
+ fs->regs.reg[5].how = REG_SAVED_OFFSET;
+ fs->regs.reg[5].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rdi - new_cfa;
+ fs->regs.reg[6].how = REG_SAVED_OFFSET;
+ fs->regs.reg[6].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rbp - new_cfa;
+ fs->regs.reg[8].how = REG_SAVED_OFFSET;
+ fs->regs.reg[8].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r8 - new_cfa;
+ fs->regs.reg[9].how = REG_SAVED_OFFSET;
+ fs->regs.reg[9].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r9 - new_cfa;
+ fs->regs.reg[10].how = REG_SAVED_OFFSET;
+ fs->regs.reg[10].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r10 - new_cfa;
+ fs->regs.reg[11].how = REG_SAVED_OFFSET;
+ fs->regs.reg[11].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r11 - new_cfa;
+ fs->regs.reg[12].how = REG_SAVED_OFFSET;
+ fs->regs.reg[12].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r12 - new_cfa;
+ fs->regs.reg[13].how = REG_SAVED_OFFSET;
+ fs->regs.reg[13].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r13 - new_cfa;
+ fs->regs.reg[14].how = REG_SAVED_OFFSET;
+ fs->regs.reg[14].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r14 - new_cfa;
+ fs->regs.reg[15].how = REG_SAVED_OFFSET;
+ fs->regs.reg[15].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_r15 - new_cfa;
+ fs->regs.reg[16].how = REG_SAVED_OFFSET;
+ fs->regs.reg[16].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_rip - new_cfa;
+ fs->retaddr_column = 16;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+
+#else /* ifdef __x86_64__ */
+
+#define MD_FALLBACK_FRAME_STATE_FOR x86_fb_fallback_frame_state
+
+static _Unwind_Reason_Code
+x86_fb_fallback_frame_state (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ unsigned int *pc = context->ra;
+ struct sigframe *sf;
+ long new_cfa;
+
+/* sys/amd64/ia32/ia32_sigtramp.S
+
+ 8d 44 24 20 lea 0x20(%esp),%eax
+ 50 push %eax
+ b8 a1 01 00 00 mov $0x1a1,%eax
+ 50 push %eax
+ cd 80 int $0x80
+ eb fe jmp -
+*/
+
+/* sys/i386/i386/locore.s: sigcode()
+
+ 8d 44 24 20 lea 0x20(%esp),%eax
+ 50 push %eax
+ f7 40 54 00 00 02 00 testl $0x20000,0x54(%eax)
+ 75 03 jne +
+ 8e 68 14 mov 0x14(%eax),%gs
+ b8 a1 01 00 00 mov $0x1a1,%eax
+ 50 push %eax
+ cd 80 int $0x80
+ eb fe jmp -
+*/
+
+ if ((pc[0] == 0x2024448dU)
+ && ((
+ (pc[1] == 0x01a1b850U)
+ && (pc[2] == 0xcd500000U)
+ && ((pc[3] & 0xFF) == 0x80)
+ )
+
+ || (
+ (pc[4] == 0x01a1b814U)
+ && (pc[5] == 0xcd500000U)
+ && ((pc[6] & 0xFF) == 0x80)
+ )))
+ {
+ sf = (struct sigframe *) context->cfa;
+ }
+ else
+ return _URC_END_OF_STACK;
+
+ new_cfa = sf->sf_uc.uc_mcontext.mc_esp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_reg = 4;
+ fs->regs.cfa_offset = new_cfa - (long) context->cfa;
+
+ /* The SVR4 register numbering macros aren't usable in libgcc. */
+ fs->regs.reg[0].how = REG_SAVED_OFFSET;
+ fs->regs.reg[0].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_eax - new_cfa;
+ fs->regs.reg[3].how = REG_SAVED_OFFSET;
+ fs->regs.reg[3].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_ebx - new_cfa;
+ fs->regs.reg[1].how = REG_SAVED_OFFSET;
+ fs->regs.reg[1].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_ecx - new_cfa;
+ fs->regs.reg[2].how = REG_SAVED_OFFSET;
+ fs->regs.reg[2].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_edx - new_cfa;
+ fs->regs.reg[6].how = REG_SAVED_OFFSET;
+ fs->regs.reg[6].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_esi - new_cfa;
+ fs->regs.reg[7].how = REG_SAVED_OFFSET;
+ fs->regs.reg[7].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_edi - new_cfa;
+ fs->regs.reg[5].how = REG_SAVED_OFFSET;
+ fs->regs.reg[5].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_ebp - new_cfa;
+ fs->regs.reg[8].how = REG_SAVED_OFFSET;
+ fs->regs.reg[8].loc.offset = (long)&sf->sf_uc.uc_mcontext.mc_eip - new_cfa;
+ fs->retaddr_column = 8;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+
+#endif /* ifdef __x86_64__ */
+#endif /* ifdef inhibit_libc */
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