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$NetBSD: patch-libgcc_config_i386_dragonfly-unwind.h,v 1.1 2014/09/04 18:43:11 jperkin Exp $
Support DragonFly.
--- libgcc/config/i386/dragonfly-unwind.h.orig 2014-09-04 10:04:27.455838710 +0000
+++ libgcc/config/i386/dragonfly-unwind.h
@@ -0,0 +1,158 @@
+/* DWARF2 EH unwinding support for DragonFly BSD: AMD x86-64 and x86.
+ Copyright (C) 2010 John Marino <draco@marino.st> */
+
+/* Do code reading to identify a signal frame, and set the frame
+ state data appropriately. See unwind-dw2.c for the structs. */
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <signal.h>
+#include <sys/ucontext.h>
+#include <machine/sigframe.h>
+
+
+#define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg
+
+#ifdef __x86_64__
+#define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state
+
+
+static void
+x86_64_sigtramp_range (unsigned char **start, unsigned char **end)
+{
+ unsigned long ps_strings;
+ int mib[2];
+ size_t len;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PS_STRINGS;
+ len = sizeof (ps_strings);
+ sysctl (mib, 2, &ps_strings, &len, NULL, 0);
+
+ *start = (unsigned char *)ps_strings - 32;
+ *end = (unsigned char *)ps_strings;
+}
+
+
+static _Unwind_Reason_Code
+x86_64_dragonfly_fallback_frame_state
+(struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ unsigned char *pc = context->ra;
+ unsigned char *sigtramp_start, *sigtramp_end;
+ struct sigframe *sf;
+ long new_cfa;
+
+ x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end);
+ if (pc >= sigtramp_end || pc < sigtramp_start)
+ return _URC_END_OF_STACK;
+
+ sf = (struct sigframe *) context->cfa;
+ new_cfa = sf->REG_NAME(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->REG_NAME(rax) - new_cfa;
+ fs->regs.reg[1].how = REG_SAVED_OFFSET;
+ fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(rdx) - new_cfa;
+ fs->regs.reg[2].how = REG_SAVED_OFFSET;
+ fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(rcx) - new_cfa;
+ fs->regs.reg[3].how = REG_SAVED_OFFSET;
+ fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(rbx) - new_cfa;
+ fs->regs.reg[4].how = REG_SAVED_OFFSET;
+ fs->regs.reg[4].loc.offset = (long)&sf->REG_NAME(rsi) - new_cfa;
+ fs->regs.reg[5].how = REG_SAVED_OFFSET;
+ fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(rdi) - new_cfa;
+ fs->regs.reg[6].how = REG_SAVED_OFFSET;
+ fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(rbp) - new_cfa;
+ fs->regs.reg[8].how = REG_SAVED_OFFSET;
+ fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(r8) - new_cfa;
+ fs->regs.reg[9].how = REG_SAVED_OFFSET;
+ fs->regs.reg[9].loc.offset = (long)&sf->REG_NAME(r9) - new_cfa;
+ fs->regs.reg[10].how = REG_SAVED_OFFSET;
+ fs->regs.reg[10].loc.offset = (long)&sf->REG_NAME(r10) - new_cfa;
+ fs->regs.reg[11].how = REG_SAVED_OFFSET;
+ fs->regs.reg[11].loc.offset = (long)&sf->REG_NAME(r11) - new_cfa;
+ fs->regs.reg[12].how = REG_SAVED_OFFSET;
+ fs->regs.reg[12].loc.offset = (long)&sf->REG_NAME(r12) - new_cfa;
+ fs->regs.reg[13].how = REG_SAVED_OFFSET;
+ fs->regs.reg[13].loc.offset = (long)&sf->REG_NAME(r13) - new_cfa;
+ fs->regs.reg[14].how = REG_SAVED_OFFSET;
+ fs->regs.reg[14].loc.offset = (long)&sf->REG_NAME(r14) - new_cfa;
+ fs->regs.reg[15].how = REG_SAVED_OFFSET;
+ fs->regs.reg[15].loc.offset = (long)&sf->REG_NAME(r15) - new_cfa;
+ fs->regs.reg[16].how = REG_SAVED_OFFSET;
+ fs->regs.reg[16].loc.offset = (long)&sf->REG_NAME(rip) - new_cfa;
+ fs->retaddr_column = 16;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+
+#else /* Next section is for i386 */
+
+#define MD_FALLBACK_FRAME_STATE_FOR x86_dragonfly_fallback_frame_state
+
+
+static void
+x86_sigtramp_range (unsigned char **start, unsigned char **end)
+{
+ unsigned long ps_strings;
+ int mib[2];
+ size_t len;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PS_STRINGS;
+ len = sizeof (ps_strings);
+ sysctl (mib, 2, &ps_strings, &len, NULL, 0);
+
+ *start = (unsigned char *)ps_strings - 128;
+ *end = (unsigned char *)ps_strings;
+}
+
+
+static _Unwind_Reason_Code
+x86_dragonfly_fallback_frame_state
+(struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ unsigned char *pc = context->ra;
+ unsigned char *sigtramp_start, *sigtramp_end;
+ struct sigframe *sf;
+ long new_cfa;
+
+ x86_sigtramp_range(&sigtramp_start, &sigtramp_end);
+
+ if (pc >= sigtramp_end || pc < sigtramp_start)
+ return _URC_END_OF_STACK;
+
+ sf = (struct sigframe *) context->cfa;
+ new_cfa = sf->REG_NAME(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->REG_NAME(eax) - new_cfa;
+ fs->regs.reg[3].how = REG_SAVED_OFFSET;
+ fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(ebx) - new_cfa;
+ fs->regs.reg[1].how = REG_SAVED_OFFSET;
+ fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(ecx) - new_cfa;
+ fs->regs.reg[2].how = REG_SAVED_OFFSET;
+ fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(edx) - new_cfa;
+ fs->regs.reg[6].how = REG_SAVED_OFFSET;
+ fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(esi) - new_cfa;
+ fs->regs.reg[7].how = REG_SAVED_OFFSET;
+ fs->regs.reg[7].loc.offset = (long)&sf->REG_NAME(edi) - new_cfa;
+ fs->regs.reg[5].how = REG_SAVED_OFFSET;
+ fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(ebp) - new_cfa;
+ fs->regs.reg[8].how = REG_SAVED_OFFSET;
+ fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(eip) - new_cfa;
+ fs->retaddr_column = 8;
+ fs->signal_frame = 1;
+ return _URC_NO_REASON;
+}
+#endif /* ifdef __x86_64__ */
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