Imported Upstream version 1.2

[platform/upstream/libunwind.git] / src / mips / Gstep.c

diff --git a/src/mips/Gstep.c b/src/mips/Gstep.c
index bafeef1..0a0b9c2 100644 (file)
--- a/src/mips/Gstep.c
+++ b/src/mips/Gstep.c
@@ -1,4 +1,5 @@
 /* libunwind - a platform-independent unwind library
+   Copyright (C) 2015 Imagination Technologies Limited
    Copyright (C) 2008 CodeSourcery
 
 This file is part of libunwind.
@@ -26,16 +27,99 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
 #include "offsets.h"
 
 PROTECTED int
-unw_step (unw_cursor_t *cursor)
+unw_handle_signal_frame (unw_cursor_t *cursor)
 {
   struct cursor *c = (struct cursor *) cursor;
+  unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
+  unw_word_t ra, fp;
   int ret;
 
-  Debug (1, "(cursor=%p)\n", c);
+  switch (unw_is_signal_frame (cursor)) {
+  case 1:
+    sc_addr = sp_addr + LINUX_SF_TRAMP_SIZE + sizeof (siginfo_t) +
+              LINUX_UC_MCONTEXT_OFF;
+    break;
+  case 2:
+    sc_addr = sp_addr + LINUX_UC_MCONTEXT_OFF;
+    break;
+  default:
+    return -UNW_EUNSPEC;
+  }
+
+  if (tdep_big_endian(c->dwarf.as))
+    sc_addr += 4;
+
+  c->sigcontext_addr = sc_addr;
+
+  /* Update the dwarf cursor. */
+  c->dwarf.loc[UNW_MIPS_R0]  = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R1]  = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R2]  = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R3]  = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R4]  = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R5]  = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R6]  = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R7]  = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R8]  = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R9]  = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R11] = DWARF_LOC (sc_addr + LINUX_SC_R11_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R12] = DWARF_LOC (sc_addr + LINUX_SC_R12_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R13] = DWARF_LOC (sc_addr + LINUX_SC_R13_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R14] = DWARF_LOC (sc_addr + LINUX_SC_R14_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R15] = DWARF_LOC (sc_addr + LINUX_SC_R15_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R16] = DWARF_LOC (sc_addr + LINUX_SC_R16_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R17] = DWARF_LOC (sc_addr + LINUX_SC_R17_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R18] = DWARF_LOC (sc_addr + LINUX_SC_R18_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R19] = DWARF_LOC (sc_addr + LINUX_SC_R19_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R20] = DWARF_LOC (sc_addr + LINUX_SC_R20_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R21] = DWARF_LOC (sc_addr + LINUX_SC_R21_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R22] = DWARF_LOC (sc_addr + LINUX_SC_R22_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R23] = DWARF_LOC (sc_addr + LINUX_SC_R23_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R24] = DWARF_LOC (sc_addr + LINUX_SC_R24_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R25] = DWARF_LOC (sc_addr + LINUX_SC_R25_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R26] = DWARF_LOC (sc_addr + LINUX_SC_R26_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R27] = DWARF_LOC (sc_addr + LINUX_SC_R27_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R28] = DWARF_LOC (sc_addr + LINUX_SC_R28_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R29] = DWARF_LOC (sc_addr + LINUX_SC_R29_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R30] = DWARF_LOC (sc_addr + LINUX_SC_R30_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_R31] = DWARF_LOC (sc_addr + LINUX_SC_R31_OFF, 0);
+  c->dwarf.loc[UNW_MIPS_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
+
+  /* Set SP/CFA and PC/IP. */
+  dwarf_get (&c->dwarf, c->dwarf.loc[UNW_MIPS_R29], &c->dwarf.cfa);
+
+  if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_PC_OFF, 0),
+                       &c->dwarf.ip)) < 0)
+    return ret;
+
+  if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_R31_OFF, 0),
+                       &ra)) < 0)
+    return ret;
+  if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_R30_OFF, 0),
+                       &fp)) < 0)
+    return ret;
+
+  Debug (2, "SH (ip=0x%016llx, ra=0x%016llx, sp=0x%016llx, fp=0x%016llx)\n",
+         (unsigned long long)c->dwarf.ip, (unsigned long long)ra,
+         (unsigned long long)c->dwarf.cfa, (unsigned long long)fp);
+
+  c->dwarf.pi_valid = 0;
+  c->dwarf.use_prev_instr = 0;
+
+  return 1;
+}
+
+PROTECTED int
+unw_step (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  int ret;
 
-  /* Try DWARF-based unwinding...  this is the only method likely to work for
-     MIPS.  */
-  ret = dwarf_step (&c->dwarf);
+  ret = unw_handle_signal_frame (cursor);
+  if (ret < 0)
+    /* Not a signal frame, try DWARF-based unwinding. */
+    ret = dwarf_step (&c->dwarf);
 
   if (unlikely (ret == -UNW_ESTOPUNWIND))
     return ret;