Initial Contribution
diff --git a/debuggerd/pr-support.c b/debuggerd/pr-support.c
new file mode 100644
index 0000000..358d9b7
--- /dev/null
+++ b/debuggerd/pr-support.c
@@ -0,0 +1,345 @@
+/* ARM EABI compliant unwinding routines
+ Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+ Contributed by Paul Brook
+
+ This file 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 2, or (at your option) any
+ later version.
+
+ In addition to the permissions in the GNU General Public License, the
+ Free Software Foundation gives you unlimited permission to link the
+ compiled version of this file into combinations with other programs,
+ and to distribute those combinations without any restriction coming
+ from the use of this file. (The General Public License restrictions
+ do apply in other respects; for example, they cover modification of
+ the file, and distribution when not linked into a combine
+ executable.)
+
+ This file 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+/****************************************************************************
+ * The functions here are derived from gcc/config/arm/pr-support.c from the
+ * 4.3.x release. The main changes here involve the use of ptrace to retrieve
+ * memory/processor states from a remote process.
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <unwind.h>
+
+#include "utility.h"
+
+/* We add a prototype for abort here to avoid creating a dependency on
+ target headers. */
+extern void abort (void);
+
+/* Derived from _Unwind_VRS_Pop to use ptrace */
+extern _Unwind_VRS_Result
+unwind_VRS_Pop_with_ptrace (_Unwind_Context *context,
+ _Unwind_VRS_RegClass regclass,
+ _uw discriminator,
+ _Unwind_VRS_DataRepresentation representation,
+ pid_t pid);
+
+typedef struct _ZSt9type_info type_info; /* This names C++ type_info type */
+
+/* Misc constants. */
+#define R_IP 12
+#define R_SP 13
+#define R_LR 14
+#define R_PC 15
+
+#define uint32_highbit (((_uw) 1) << 31)
+
+void __attribute__((weak)) __cxa_call_unexpected(_Unwind_Control_Block *ucbp);
+
+/* Unwind descriptors. */
+
+typedef struct
+{
+ _uw16 length;
+ _uw16 offset;
+} EHT16;
+
+typedef struct
+{
+ _uw length;
+ _uw offset;
+} EHT32;
+
+/* Personality routine helper functions. */
+
+#define CODE_FINISH (0xb0)
+
+/* Derived from next_unwind_byte to use ptrace */
+/* Return the next byte of unwinding information, or CODE_FINISH if there is
+ no data remaining. */
+static inline _uw8
+next_unwind_byte_with_ptrace (__gnu_unwind_state * uws, pid_t pid)
+{
+ _uw8 b;
+
+ if (uws->bytes_left == 0)
+ {
+ /* Load another word */
+ if (uws->words_left == 0)
+ return CODE_FINISH; /* Nothing left. */
+ uws->words_left--;
+ uws->data = get_remote_word(pid, uws->next);
+ uws->next++;
+ uws->bytes_left = 3;
+ }
+ else
+ uws->bytes_left--;
+
+ /* Extract the most significant byte. */
+ b = (uws->data >> 24) & 0xff;
+ uws->data <<= 8;
+ return b;
+}
+
+/* Execute the unwinding instructions described by UWS. */
+_Unwind_Reason_Code
+unwind_execute_with_ptrace(_Unwind_Context * context, __gnu_unwind_state * uws,
+ pid_t pid)
+{
+ _uw op;
+ int set_pc;
+ _uw reg;
+
+ set_pc = 0;
+ for (;;)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == CODE_FINISH)
+ {
+ /* If we haven't already set pc then copy it from lr. */
+ if (!set_pc)
+ {
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_LR, _UVRSD_UINT32,
+ ®);
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_PC, _UVRSD_UINT32,
+ ®);
+ set_pc = 1;
+ }
+ /* Drop out of the loop. */
+ break;
+ }
+ if ((op & 0x80) == 0)
+ {
+ /* vsp = vsp +- (imm6 << 2 + 4). */
+ _uw offset;
+
+ offset = ((op & 0x3f) << 2) + 4;
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ if (op & 0x40)
+ reg -= offset;
+ else
+ reg += offset;
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ continue;
+ }
+
+ if ((op & 0xf0) == 0x80)
+ {
+ op = (op << 8) | next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0x8000)
+ {
+ /* Refuse to unwind. */
+ return _URC_FAILURE;
+ }
+ /* Pop r4-r15 under mask. */
+ op = (op << 4) & 0xfff0;
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op, _UVRSD_UINT32,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ if (op & (1 << R_PC))
+ set_pc = 1;
+ continue;
+ }
+ if ((op & 0xf0) == 0x90)
+ {
+ op &= 0xf;
+ if (op == 13 || op == 15)
+ /* Reserved. */
+ return _URC_FAILURE;
+ /* vsp = r[nnnn]. */
+ _Unwind_VRS_Get (context, _UVRSC_CORE, op, _UVRSD_UINT32, ®);
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, ®);
+ continue;
+ }
+ if ((op & 0xf0) == 0xa0)
+ {
+ /* Pop r4-r[4+nnn], [lr]. */
+ _uw mask;
+
+ mask = (0xff0 >> (7 - (op & 7))) & 0xff0;
+ if (op & 8)
+ mask |= (1 << R_LR);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, mask, _UVRSD_UINT32,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf0) == 0xb0)
+ {
+ /* op == 0xb0 already handled. */
+ if (op == 0xb1)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0 || ((op & 0xf0) != 0))
+ /* Spare. */
+ return _URC_FAILURE;
+ /* Pop r0-r4 under mask. */
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_CORE, op,
+ _UVRSD_UINT32, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xb2)
+ {
+ /* vsp = vsp + 0x204 + (uleb128 << 2). */
+ int shift;
+
+ _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
+ ®);
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ shift = 2;
+ while (op & 0x80)
+ {
+ reg += ((op & 0x7f) << shift);
+ shift += 7;
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ }
+ reg += ((op & 0x7f) << shift) + 0x204;
+ _Unwind_VRS_Set (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32,
+ ®);
+ continue;
+ }
+ if (op == 0xb3)
+ {
+ /* Pop VFP registers with fldmx. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xfc) == 0xb4)
+ {
+ /* Pop FPA E[4]-E[4+nn]. */
+ op = 0x40000 | ((op & 3) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* op & 0xf8 == 0xb8. */
+ /* Pop VFP D[8]-D[8+nnn] with fldmx. */
+ op = 0x80000 | ((op & 7) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_VFPX, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf0) == 0xc0)
+ {
+ if (op == 0xc6)
+ {
+ /* Pop iWMMXt D registers. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op,
+ _UVRSD_UINT64, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xc7)
+ {
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ if (op == 0 || (op & 0xf0) != 0)
+ /* Spare. */
+ return _URC_FAILURE;
+ /* Pop iWMMXt wCGR{3,2,1,0} under mask. */
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXC, op,
+ _UVRSD_UINT32, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if ((op & 0xf8) == 0xc0)
+ {
+ /* Pop iWMMXt wR[10]-wR[10+nnn]. */
+ op = 0xa0000 | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_WMMXD, op,
+ _UVRSD_UINT64, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ if (op == 0xc8)
+ {
+#ifndef __VFP_FP__
+ /* Pop FPA registers. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_FPA, op, _UVRSD_FPAX,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+#else
+ /* Pop VFPv3 registers D[16+ssss]-D[16+ssss+cccc] with vldm. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = (((op & 0xf0) + 16) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op,
+ _UVRSD_DOUBLE, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+#endif
+ }
+ if (op == 0xc9)
+ {
+ /* Pop VFP registers with fldmd. */
+ op = next_unwind_byte_with_ptrace (uws, pid);
+ op = ((op & 0xf0) << 12) | ((op & 0xf) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op,
+ _UVRSD_DOUBLE, pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* Spare. */
+ return _URC_FAILURE;
+ }
+ if ((op & 0xf8) == 0xd0)
+ {
+ /* Pop VFP D[8]-D[8+nnn] with fldmd. */
+ op = 0x80000 | ((op & 7) + 1);
+ if (unwind_VRS_Pop_with_ptrace (context, _UVRSC_VFP, op, _UVRSD_DOUBLE,
+ pid)
+ != _UVRSR_OK)
+ return _URC_FAILURE;
+ continue;
+ }
+ /* Spare. */
+ return _URC_FAILURE;
+ }
+ return _URC_OK;
+}