$NetBSD$

--- src/x86/Gos-netbsd.c.orig	2018-09-05 10:31:53.492275380 +0000
+++ src/x86/Gos-netbsd.c
@@ -0,0 +1,374 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2018 Januk Rytarowski <n54@gmx.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <signal.h>
+#include <stddef.h>
+#include <ucontext.h>
+#include <machine/sigframe.h>
+
+#include "unwind_i.h"
+#include "offsets.h"
+
+int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  unw_word_t w0, w1, w2, w3, w4, w5, ip;
+  unw_addr_space_t as;
+  unw_accessors_t *a;
+  void *arg;
+  int ret;
+
+  as = c->dwarf.as;
+  a = unw_get_accessors_int (as);
+  arg = c->dwarf.as_arg;
+
+  /* Check if EIP points at sigreturn() sequence.  It can be:
+sigcode+4: from amd64 freebsd32 environment
+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
+
+sigcode+4: from real i386
+8d 44 24 20             lea    0x20(%esp),%eax
+50                      push   %eax
+f7 40 54 00 02 00       testl  $0x20000,0x54(%eax)
+75 03                   jne    sigcode+21
+8e 68 14                mov    0x14(%eax),%gs
+b8 a1 01 00 00          mov    $0x1a1,%eax
+50                      push   %eax
+cd 80                   int    $0x80
+
+freebsd4_sigcode+4:
+XXX
+osigcode:
+XXX
+  */
+  ip = c->dwarf.ip;
+  ret = X86_SCF_NONE;
+  c->sigcontext_format = ret;
+  if ((*a->access_mem) (as, ip, &w0, 0, arg) < 0 ||
+      (*a->access_mem) (as, ip + 4, &w1, 0, arg) < 0 ||
+      (*a->access_mem) (as, ip + 8, &w2, 0, arg) < 0 ||
+      (*a->access_mem) (as, ip + 12, &w3, 0, arg) < 0)
+    return ret;
+  if (w0 == 0x2024448d && w1 == 0x01a1b850 && w2 == 0xcd500000 &&
+      (w3 & 0xff) == 0x80)
+    ret = X86_SCF_FREEBSD_SIGFRAME;
+  else {
+    if ((*a->access_mem) (as, ip + 16, &w4, 0, arg) < 0 ||
+        (*a->access_mem) (as, ip + 20, &w5, 0, arg) < 0)
+      return ret;
+    if (w0 == 0x2024448d && w1 == 0x5440f750 && w2 == 0x75000200 &&
+        w3 == 0x14688e03 && w4 == 0x0001a1b8 && w5 == 0x80cd5000)
+      ret = X86_SCF_FREEBSD_SIGFRAME;
+  }
+
+  /* Check for syscall */
+  if (ret == X86_SCF_NONE && (*a->access_mem) (as, ip - 2, &w0, 0, arg) >= 0 &&
+      (w0 & 0xffff) == 0x80cd)
+    ret = X86_SCF_FREEBSD_SYSCALL;
+  Debug (16, "returning %d\n", ret);
+  c->sigcontext_format = ret;
+  return (ret);
+}
+
+HIDDEN int
+x86_handle_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  int ret;
+
+  if (c->sigcontext_format == X86_SCF_FREEBSD_SIGFRAME) {
+    struct sigframe *sf;
+    uintptr_t uc_addr;
+    struct dwarf_loc esp_loc;
+
+    sf = (struct sigframe *)c->dwarf.cfa;
+    uc_addr = (uintptr_t)&(sf->sf_uc);
+    c->sigcontext_addr = c->dwarf.cfa;
+
+    esp_loc = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESP_OFF, 0);
+    ret = dwarf_get (&c->dwarf, esp_loc, &c->dwarf.cfa);
+    if (ret < 0)
+    {
+            Debug (2, "returning 0\n");
+            return 0;
+    }
+
+    c->dwarf.loc[EIP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EIP_OFF, 0);
+    c->dwarf.loc[ESP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESP_OFF, 0);
+    c->dwarf.loc[EAX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EAX_OFF, 0);
+    c->dwarf.loc[ECX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ECX_OFF, 0);
+    c->dwarf.loc[EDX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EDX_OFF, 0);
+    c->dwarf.loc[EBX] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EBX_OFF, 0);
+    c->dwarf.loc[EBP] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EBP_OFF, 0);
+    c->dwarf.loc[ESI] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_ESI_OFF, 0);
+    c->dwarf.loc[EDI] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EDI_OFF, 0);
+    c->dwarf.loc[EFLAGS] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_EFLAGS_OFF, 0);
+    c->dwarf.loc[TRAPNO] = DWARF_LOC (uc_addr + FREEBSD_UC_MCONTEXT_TRAPNO_OFF, 0);
+    c->dwarf.loc[ST0] = DWARF_NULL_LOC;
+  } else if (c->sigcontext_format == X86_SCF_FREEBSD_SYSCALL) {
+    c->dwarf.loc[EIP] = DWARF_LOC (c->dwarf.cfa, 0);
+    c->dwarf.loc[EAX] = DWARF_NULL_LOC;
+    c->dwarf.cfa += 4;
+    c->dwarf.use_prev_instr = 1;
+  } else {
+    Debug (8, "Gstep: not handling frame format %d\n", c->sigcontext_format);
+    abort();
+  }
+  return 0;
+}
+
+HIDDEN dwarf_loc_t
+x86_get_scratch_loc (struct cursor *c, unw_regnum_t reg)
+{
+  unw_word_t addr = c->sigcontext_addr, off, xmm_off;
+  unw_word_t fpstate, fpformat;
+  int ret, is_fpstate = 0, is_xmmstate = 0;
+
+  switch (c->sigcontext_format)
+    {
+    case X86_SCF_NONE:
+      return DWARF_REG_LOC (&c->dwarf, reg);
+
+    case X86_SCF_FREEBSD_SIGFRAME:
+      addr += offsetof(struct sigframe, sf_uc) + FREEBSD_UC_MCONTEXT_OFF;
+      break;
+
+    case X86_SCF_FREEBSD_SIGFRAME4:
+      abort();
+      break;
+
+    case X86_SCF_FREEBSD_OSIGFRAME:
+      /* XXXKIB */
+      abort();
+      break;
+
+    case X86_SCF_FREEBSD_SYSCALL:
+      /* XXXKIB */
+      abort();
+      break;
+
+    default:
+      /* XXXKIB */
+      abort();
+      break;
+    }
+
+  off = 0; /* shut gcc warning */
+  switch (reg)
+    {
+    case UNW_X86_GS: off = FREEBSD_UC_MCONTEXT_GS_OFF; break;
+    case UNW_X86_FS: off = FREEBSD_UC_MCONTEXT_FS_OFF; break;
+    case UNW_X86_ES: off = FREEBSD_UC_MCONTEXT_ES_OFF; break;
+    case UNW_X86_DS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
+    case UNW_X86_EDI: off = FREEBSD_UC_MCONTEXT_EDI_OFF; break;
+    case UNW_X86_ESI: off = FREEBSD_UC_MCONTEXT_ESI_OFF; break;
+    case UNW_X86_EBP: off = FREEBSD_UC_MCONTEXT_EBP_OFF; break;
+    case UNW_X86_ESP: off = FREEBSD_UC_MCONTEXT_ESP_OFF; break;
+    case UNW_X86_EBX: off = FREEBSD_UC_MCONTEXT_EBX_OFF; break;
+    case UNW_X86_EDX: off = FREEBSD_UC_MCONTEXT_EDX_OFF; break;
+    case UNW_X86_ECX: off = FREEBSD_UC_MCONTEXT_ECX_OFF; break;
+    case UNW_X86_EAX: off = FREEBSD_UC_MCONTEXT_EAX_OFF; break;
+    case UNW_X86_TRAPNO: off = FREEBSD_UC_MCONTEXT_TRAPNO_OFF; break;
+    case UNW_X86_EIP: off = FREEBSD_UC_MCONTEXT_EIP_OFF; break;
+    case UNW_X86_CS: off = FREEBSD_UC_MCONTEXT_CS_OFF; break;
+    case UNW_X86_EFLAGS: off = FREEBSD_UC_MCONTEXT_EFLAGS_OFF; break;
+    case UNW_X86_SS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
+
+    case UNW_X86_FCW:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_CW_OFF;
+      xmm_off = FREEBSD_UC_MCONTEXT_CW_XMM_OFF;
+      break;
+    case UNW_X86_FSW:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_SW_OFF;
+      xmm_off = FREEBSD_UC_MCONTEXT_SW_XMM_OFF;
+      break;
+    case UNW_X86_FTW:
+      is_fpstate = 1;
+      xmm_off = FREEBSD_UC_MCONTEXT_TAG_XMM_OFF;
+      off = FREEBSD_UC_MCONTEXT_TAG_OFF;
+      break;
+    case UNW_X86_FCS:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_CSSEL_OFF;
+      xmm_off = FREEBSD_UC_MCONTEXT_CSSEL_XMM_OFF;
+      break;
+    case UNW_X86_FIP:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_IPOFF_OFF;
+      xmm_off = FREEBSD_UC_MCONTEXT_IPOFF_XMM_OFF;
+      break;
+    case UNW_X86_FEA:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_DATAOFF_OFF;
+      xmm_off = FREEBSD_UC_MCONTEXT_DATAOFF_XMM_OFF;
+      break;
+    case UNW_X86_FDS:
+      is_fpstate = 1;
+      off = FREEBSD_US_MCONTEXT_DATASEL_OFF;
+      xmm_off = FREEBSD_US_MCONTEXT_DATASEL_XMM_OFF;
+      break;
+    case UNW_X86_MXCSR:
+      is_fpstate = 1;
+      is_xmmstate = 1;
+      xmm_off = FREEBSD_UC_MCONTEXT_MXCSR_XMM_OFF;
+      break;
+
+      /* stacked fp registers */
+    case UNW_X86_ST0: case UNW_X86_ST1: case UNW_X86_ST2: case UNW_X86_ST3:
+    case UNW_X86_ST4: case UNW_X86_ST5: case UNW_X86_ST6: case UNW_X86_ST7:
+      is_fpstate = 1;
+      off = FREEBSD_UC_MCONTEXT_ST0_OFF + 10*(reg - UNW_X86_ST0);
+      xmm_off = FREEBSD_UC_MCONTEXT_ST0_XMM_OFF + 10*(reg - UNW_X86_ST0);
+      break;
+
+     /* SSE fp registers */
+    case UNW_X86_XMM0_lo: case UNW_X86_XMM0_hi:
+    case UNW_X86_XMM1_lo: case UNW_X86_XMM1_hi:
+    case UNW_X86_XMM2_lo: case UNW_X86_XMM2_hi:
+    case UNW_X86_XMM3_lo: case UNW_X86_XMM3_hi:
+    case UNW_X86_XMM4_lo: case UNW_X86_XMM4_hi:
+    case UNW_X86_XMM5_lo: case UNW_X86_XMM5_hi:
+    case UNW_X86_XMM6_lo: case UNW_X86_XMM6_hi:
+    case UNW_X86_XMM7_lo: case UNW_X86_XMM7_hi:
+      is_fpstate = 1;
+      is_xmmstate = 1;
+      xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 8*(reg - UNW_X86_XMM0_lo);
+      break;
+    case UNW_X86_XMM0:
+    case UNW_X86_XMM1:
+    case UNW_X86_XMM2:
+    case UNW_X86_XMM3:
+    case UNW_X86_XMM4:
+    case UNW_X86_XMM5:
+    case UNW_X86_XMM6:
+    case UNW_X86_XMM7:
+      is_fpstate = 1;
+      is_xmmstate = 1;
+      xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 16*(reg - UNW_X86_XMM0);
+      break;
+
+    case UNW_X86_FOP:
+    case UNW_X86_TSS:
+    case UNW_X86_LDT:
+    default:
+      return DWARF_REG_LOC (&c->dwarf, reg);
+    }
+
+  if (is_fpstate)
+    {
+      if ((ret = dwarf_get (&c->dwarf,
+           DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPSTATE_OFF),
+           &fpstate)) < 0)
+        return DWARF_NULL_LOC;
+      if (fpstate == FREEBSD_UC_MCONTEXT_FPOWNED_NONE)
+        return DWARF_NULL_LOC;
+      if ((ret = dwarf_get (&c->dwarf,
+           DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPFORMAT_OFF),
+           &fpformat)) < 0)
+        return DWARF_NULL_LOC;
+      if (fpformat == FREEBSD_UC_MCONTEXT_FPFMT_NODEV ||
+          (is_xmmstate && fpformat != FREEBSD_UC_MCONTEXT_FPFMT_XMM))
+        return DWARF_NULL_LOC;
+      if (is_xmmstate)
+        off = xmm_off;
+    }
+
+    return DWARF_MEM_LOC (c, addr + off);
+}
+
+#ifndef UNW_REMOTE_ONLY
+HIDDEN void *
+x86_r_uc_addr (ucontext_t *uc, int reg)
+{
+  void *addr;
+
+  switch (reg)
+    {
+    case UNW_X86_GS:  addr = &uc->uc_mcontext.mc_gs; break;
+    case UNW_X86_FS:  addr = &uc->uc_mcontext.mc_fs; break;
+    case UNW_X86_ES:  addr = &uc->uc_mcontext.mc_es; break;
+    case UNW_X86_DS:  addr = &uc->uc_mcontext.mc_ds; break;
+    case UNW_X86_EAX: addr = &uc->uc_mcontext.mc_eax; break;
+    case UNW_X86_EBX: addr = &uc->uc_mcontext.mc_ebx; break;
+    case UNW_X86_ECX: addr = &uc->uc_mcontext.mc_ecx; break;
+    case UNW_X86_EDX: addr = &uc->uc_mcontext.mc_edx; break;
+    case UNW_X86_ESI: addr = &uc->uc_mcontext.mc_esi; break;
+    case UNW_X86_EDI: addr = &uc->uc_mcontext.mc_edi; break;
+    case UNW_X86_EBP: addr = &uc->uc_mcontext.mc_ebp; break;
+    case UNW_X86_EIP: addr = &uc->uc_mcontext.mc_eip; break;
+    case UNW_X86_ESP: addr = &uc->uc_mcontext.mc_esp; break;
+    case UNW_X86_TRAPNO:  addr = &uc->uc_mcontext.mc_trapno; break;
+    case UNW_X86_CS:  addr = &uc->uc_mcontext.mc_cs; break;
+    case UNW_X86_EFLAGS:  addr = &uc->uc_mcontext.mc_eflags; break;
+    case UNW_X86_SS:  addr = &uc->uc_mcontext.mc_ss; break;
+
+    default:
+      addr = NULL;
+    }
+  return addr;
+}
+
+HIDDEN int
+x86_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  ucontext_t *uc = c->uc;
+
+  /* Ensure c->pi is up-to-date.  On x86, it's relatively common to be
+     missing DWARF unwind info.  We don't want to fail in that case,
+     because the frame-chain still would let us do a backtrace at
+     least.  */
+  dwarf_make_proc_info (&c->dwarf);
+
+  if (c->sigcontext_format == X86_SCF_NONE) {
+      Debug (8, "resuming at ip=%x via setcontext()\n", c->dwarf.ip);
+      setcontext (uc);
+      abort();
+  } else if (c->sigcontext_format == X86_SCF_FREEBSD_SIGFRAME) {
+      struct sigcontext *sc = (struct sigcontext *) c->sigcontext_addr;
+
+      Debug (8, "resuming at ip=%x via sigreturn(%p)\n", c->dwarf.ip, sc);
+      sigreturn((ucontext_t *)((const char *)sc + FREEBSD_SC_UCONTEXT_OFF));
+      abort();
+  } else {
+      Debug (8, "resuming at ip=%x for sigcontext format %d not implemented\n",
+      c->dwarf.ip, c->sigcontext_format);
+      abort();
+  }
+  return -UNW_EINVAL;
+}
+
+#endif
