#include "unwind_i.h"
#include "ucontext_i.h"
+#include "remote.h"
#include <signal.h>
/* This definition originates in /usr/include/asm-ppc64/ptrace.h, but is
stack_frame_t dummy;
unw_word_t back_chain_offset, lr_save_offset, v_regs_ptr;
struct dwarf_loc back_chain_loc, lr_save_loc, sp_loc, ip_loc, v_regs_loc;
- int ret;
+ int ret, i;
Debug (1, "(cursor=%p, ip=0x%016lx)\n", c, (unsigned long) c->dwarf.ip);
- if (c->dwarf.ip == 0)
- {
- /* Unless the cursor or stack is corrupt or uninitialized,
- we've most likely hit the top of the stack */
- return 0;
- }
-
/* Try DWARF-based unwinding... */
ret = dwarf_step (&c->dwarf);
if (unlikely (ret < 0))
{
if (likely (!unw_is_signal_frame (cursor)))
- {
- /* DWARF unwinding failed. As of 09/26/2006, gcc in 64-bit mode
- produces the mandatory level of traceback record in the code, but
- I get the impression that this is transitory, that eventually gcc
- will not produce any traceback records at all. So, for now, we
- won't bother to try to find and use these records.
-
- We can, however, attempt to unwind the frame by using the callback
- chain. This is very crude, however, and won't be able to unwind
- any registers besides the IP, SP, and LR . */
-
- back_chain_offset = ((void *) &dummy.back_chain - (void *) &dummy);
- lr_save_offset = ((void *) &dummy.lr_save - (void *) &dummy);
-
- back_chain_loc = DWARF_LOC (c->dwarf.cfa + back_chain_offset, 0);
-
- if ((ret =
- dwarf_get (&c->dwarf, back_chain_loc, &c->dwarf.cfa)) < 0)
- {
- Debug (2,
- "Unable to retrieve CFA from back chain in stack frame - %d\n",
- ret);
- return ret;
- }
- if (c->dwarf.cfa == 0)
- /* Unless the cursor or stack is corrupt or uninitialized we've most
- likely hit the top of the stack */
- return 0;
-
- lr_save_loc = DWARF_LOC (c->dwarf.cfa + lr_save_offset, 0);
-
- if ((ret = dwarf_get (&c->dwarf, lr_save_loc, &c->dwarf.ip)) < 0)
- {
- Debug (2,
- "Unable to retrieve IP from lr save in stack frame - %d\n",
- ret);
- return ret;
- }
- ret = 1;
- }
+ {
+ /* DWARF unwinding failed. As of 09/26/2006, gcc in 64-bit mode
+ produces the mandatory level of traceback record in the code, but
+ I get the impression that this is transitory, that eventually gcc
+ will not produce any traceback records at all. So, for now, we
+ won't bother to try to find and use these records.
+
+ We can, however, attempt to unwind the frame by using the callback
+ chain. This is very crude, however, and won't be able to unwind
+ any registers besides the IP, SP, and LR . */
+
+ back_chain_offset = ((void *) &dummy.back_chain - (void *) &dummy);
+ lr_save_offset = ((void *) &dummy.lr_save - (void *) &dummy);
+
+ back_chain_loc = DWARF_LOC (c->dwarf.cfa + back_chain_offset, 0);
+
+ if ((ret =
+ dwarf_get (&c->dwarf, back_chain_loc, &c->dwarf.cfa)) < 0)
+ {
+ Debug (2,
+ "Unable to retrieve CFA from back chain in stack frame - %d\n",
+ ret);
+ return ret;
+ }
+ if (c->dwarf.cfa == 0)
+ /* Unless the cursor or stack is corrupt or uninitialized we've most
+ likely hit the top of the stack */
+ return 0;
+
+ lr_save_loc = DWARF_LOC (c->dwarf.cfa + lr_save_offset, 0);
+
+ if ((ret = dwarf_get (&c->dwarf, lr_save_loc, &c->dwarf.ip)) < 0)
+ {
+ Debug (2,
+ "Unable to retrieve IP from lr save in stack frame - %d\n",
+ ret);
+ return ret;
+ }
+
+ /* Mark all registers unsaved */
+ for (i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
+ c->dwarf.loc[i] = DWARF_NULL_LOC;
+
+ ret = 1;
+ }
else
- {
+ {
/* Find the sigcontext record by taking the CFA and adjusting by
the dummy signal frame size.
following code will likely cause a seg fault or other crash
condition. */
- unw_word_t ucontext = c->dwarf.cfa + __SIGNAL_FRAMESIZE;
-
- Debug (1, "signal frame, skip over trampoline\n");
-
- c->sigcontext_format = PPC_SCF_LINUX_RT_SIGFRAME;
- c->sigcontext_addr = ucontext;
-
- sp_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R1, 0);
- ip_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
-
- ret = dwarf_get (&c->dwarf, sp_loc, &c->dwarf.cfa);
- if (ret < 0)
- {
- Debug (2, "returning %d\n", ret);
- return ret;
- }
- ret = dwarf_get (&c->dwarf, ip_loc, &c->dwarf.ip);
- if (ret < 0)
- {
- Debug (2, "returning %d\n", ret);
- return ret;
- }
-
- /* Instead of just restoring the non-volatile registers, do all
- of the registers for now. This will incur a performance hit,
- but it's rare enough not to cause too much of a problem, and
- might be useful in some cases. */
- c->dwarf.loc[UNW_PPC64_R0] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R0, 0);
- c->dwarf.loc[UNW_PPC64_R1] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R1, 0);
- c->dwarf.loc[UNW_PPC64_R2] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R2, 0);
- c->dwarf.loc[UNW_PPC64_R3] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R3, 0);
- c->dwarf.loc[UNW_PPC64_R4] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R4, 0);
- c->dwarf.loc[UNW_PPC64_R5] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R5, 0);
- c->dwarf.loc[UNW_PPC64_R6] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R6, 0);
- c->dwarf.loc[UNW_PPC64_R7] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R7, 0);
- c->dwarf.loc[UNW_PPC64_R8] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R8, 0);
- c->dwarf.loc[UNW_PPC64_R9] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R9, 0);
- c->dwarf.loc[UNW_PPC64_R10] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R10, 0);
- c->dwarf.loc[UNW_PPC64_R11] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R11, 0);
- c->dwarf.loc[UNW_PPC64_R12] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R12, 0);
- c->dwarf.loc[UNW_PPC64_R13] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R13, 0);
- c->dwarf.loc[UNW_PPC64_R14] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R14, 0);
- c->dwarf.loc[UNW_PPC64_R15] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R15, 0);
- c->dwarf.loc[UNW_PPC64_R16] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R16, 0);
- c->dwarf.loc[UNW_PPC64_R17] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R17, 0);
- c->dwarf.loc[UNW_PPC64_R18] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R18, 0);
- c->dwarf.loc[UNW_PPC64_R19] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R19, 0);
- c->dwarf.loc[UNW_PPC64_R20] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R20, 0);
- c->dwarf.loc[UNW_PPC64_R21] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R21, 0);
- c->dwarf.loc[UNW_PPC64_R22] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R22, 0);
- c->dwarf.loc[UNW_PPC64_R23] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R23, 0);
- c->dwarf.loc[UNW_PPC64_R24] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R24, 0);
- c->dwarf.loc[UNW_PPC64_R25] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R25, 0);
- c->dwarf.loc[UNW_PPC64_R26] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R26, 0);
- c->dwarf.loc[UNW_PPC64_R27] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R27, 0);
- c->dwarf.loc[UNW_PPC64_R28] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R28, 0);
- c->dwarf.loc[UNW_PPC64_R29] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R29, 0);
- c->dwarf.loc[UNW_PPC64_R30] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R30, 0);
- c->dwarf.loc[UNW_PPC64_R31] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R31, 0);
-
- c->dwarf.loc[UNW_PPC64_LR] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_LINK, 0);
- c->dwarf.loc[UNW_PPC64_CTR] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CTR, 0);
- /* This CR0 assignment is probably wrong. There are 8 dwarf columns
- assigned to the CR registers, but only one CR register in the
- mcontext structure */
- c->dwarf.loc[UNW_PPC64_CR0] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CCR, 0);
- c->dwarf.loc[UNW_PPC64_XER] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_XER, 0);
- c->dwarf.loc[UNW_PPC64_NIP] =
- DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
-
- /* TODO: Is there a way of obtaining the value of the
- pseudo frame pointer (which is sp + some fixed offset, I
- assume), based on the contents of the ucontext record
- structure? For now, set this loc to null. */
- c->dwarf.loc[UNW_PPC64_FRAME_POINTER] = DWARF_NULL_LOC;
-
- c->dwarf.loc[UNW_PPC64_F0] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R0, 0);
- c->dwarf.loc[UNW_PPC64_F1] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R1, 0);
- c->dwarf.loc[UNW_PPC64_F2] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R2, 0);
- c->dwarf.loc[UNW_PPC64_F3] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R3, 0);
- c->dwarf.loc[UNW_PPC64_F4] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R4, 0);
- c->dwarf.loc[UNW_PPC64_F5] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R5, 0);
- c->dwarf.loc[UNW_PPC64_F6] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R6, 0);
- c->dwarf.loc[UNW_PPC64_F7] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R7, 0);
- c->dwarf.loc[UNW_PPC64_F8] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R8, 0);
- c->dwarf.loc[UNW_PPC64_F9] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R9, 0);
- c->dwarf.loc[UNW_PPC64_F10] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R10, 0);
- c->dwarf.loc[UNW_PPC64_F11] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R11, 0);
- c->dwarf.loc[UNW_PPC64_F12] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R12, 0);
- c->dwarf.loc[UNW_PPC64_F13] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R13, 0);
- c->dwarf.loc[UNW_PPC64_F14] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R14, 0);
- c->dwarf.loc[UNW_PPC64_F15] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R15, 0);
- c->dwarf.loc[UNW_PPC64_F16] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R16, 0);
- c->dwarf.loc[UNW_PPC64_F17] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R17, 0);
- c->dwarf.loc[UNW_PPC64_F18] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R18, 0);
- c->dwarf.loc[UNW_PPC64_F19] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R19, 0);
- c->dwarf.loc[UNW_PPC64_F20] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R20, 0);
- c->dwarf.loc[UNW_PPC64_F21] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R21, 0);
- c->dwarf.loc[UNW_PPC64_F22] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R22, 0);
- c->dwarf.loc[UNW_PPC64_F23] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R23, 0);
- c->dwarf.loc[UNW_PPC64_F24] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R24, 0);
- c->dwarf.loc[UNW_PPC64_F25] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R25, 0);
- c->dwarf.loc[UNW_PPC64_F26] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R26, 0);
- c->dwarf.loc[UNW_PPC64_F27] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R27, 0);
- c->dwarf.loc[UNW_PPC64_F28] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R28, 0);
- c->dwarf.loc[UNW_PPC64_F29] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R29, 0);
- c->dwarf.loc[UNW_PPC64_F30] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R30, 0);
- c->dwarf.loc[UNW_PPC64_F31] =
- DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R31, 0);
- /* Note that there is no .eh_section register column for the
- FPSCR register. I don't know why this is. */
-
- v_regs_loc = DWARF_LOC (ucontext + UC_MCONTEXT_V_REGS, 0);
- ret = dwarf_get (&c->dwarf, v_regs_loc, &v_regs_ptr);
- if (ret < 0)
- {
- Debug (2, "returning %d\n", ret);
- return ret;
- }
- if (v_regs_ptr != 0)
- {
- /* The v_regs_ptr is not null. Set all of the AltiVec locs */
-
- c->dwarf.loc[UNW_PPC64_V0] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R0, 0);
- c->dwarf.loc[UNW_PPC64_V1] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R1, 0);
- c->dwarf.loc[UNW_PPC64_V2] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R2, 0);
- c->dwarf.loc[UNW_PPC64_V3] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R3, 0);
- c->dwarf.loc[UNW_PPC64_V4] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R4, 0);
- c->dwarf.loc[UNW_PPC64_V5] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R5, 0);
- c->dwarf.loc[UNW_PPC64_V6] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R6, 0);
- c->dwarf.loc[UNW_PPC64_V7] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R7, 0);
- c->dwarf.loc[UNW_PPC64_V8] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R8, 0);
- c->dwarf.loc[UNW_PPC64_V9] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R9, 0);
- c->dwarf.loc[UNW_PPC64_V10] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R10, 0);
- c->dwarf.loc[UNW_PPC64_V11] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R11, 0);
- c->dwarf.loc[UNW_PPC64_V12] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R12, 0);
- c->dwarf.loc[UNW_PPC64_V13] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R13, 0);
- c->dwarf.loc[UNW_PPC64_V14] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R14, 0);
- c->dwarf.loc[UNW_PPC64_V15] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R15, 0);
- c->dwarf.loc[UNW_PPC64_V16] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R16, 0);
- c->dwarf.loc[UNW_PPC64_V17] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R17, 0);
- c->dwarf.loc[UNW_PPC64_V18] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R18, 0);
- c->dwarf.loc[UNW_PPC64_V19] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R19, 0);
- c->dwarf.loc[UNW_PPC64_V20] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R20, 0);
- c->dwarf.loc[UNW_PPC64_V21] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R21, 0);
- c->dwarf.loc[UNW_PPC64_V22] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R22, 0);
- c->dwarf.loc[UNW_PPC64_V23] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R23, 0);
- c->dwarf.loc[UNW_PPC64_V24] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R24, 0);
- c->dwarf.loc[UNW_PPC64_V25] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R25, 0);
- c->dwarf.loc[UNW_PPC64_V26] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R26, 0);
- c->dwarf.loc[UNW_PPC64_V27] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R27, 0);
- c->dwarf.loc[UNW_PPC64_V28] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R28, 0);
- c->dwarf.loc[UNW_PPC64_V29] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R29, 0);
- c->dwarf.loc[UNW_PPC64_V30] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R30, 0);
- c->dwarf.loc[UNW_PPC64_V31] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R31, 0);
- c->dwarf.loc[UNW_PPC64_VRSAVE] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_VRSAVE, 0);
- c->dwarf.loc[UNW_PPC64_VSCR] =
- DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_VSCR, 0);
- }
- else
- {
- c->dwarf.loc[UNW_PPC64_V0] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V1] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V2] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V3] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V4] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V5] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V6] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V7] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V8] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V9] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V10] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V11] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V12] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V13] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V14] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V15] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V16] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V17] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V18] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V19] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V20] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V21] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V22] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V23] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V24] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V25] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V26] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V27] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V28] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V29] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V30] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_V31] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_VRSAVE] = DWARF_NULL_LOC;
- c->dwarf.loc[UNW_PPC64_VSCR] = DWARF_NULL_LOC;
- }
- ret = 1;
- }
+ unw_word_t ucontext = c->dwarf.cfa + __SIGNAL_FRAMESIZE;
+
+ Debug (1, "signal frame, skip over trampoline\n");
+
+ c->sigcontext_format = PPC_SCF_LINUX_RT_SIGFRAME;
+ c->sigcontext_addr = ucontext;
+
+ sp_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R1, 0);
+ ip_loc = DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
+
+ ret = dwarf_get (&c->dwarf, sp_loc, &c->dwarf.cfa);
+ if (ret < 0)
+ {
+ Debug (2, "returning %d\n", ret);
+ return ret;
+ }
+ ret = dwarf_get (&c->dwarf, ip_loc, &c->dwarf.ip);
+ if (ret < 0)
+ {
+ Debug (2, "returning %d\n", ret);
+ return ret;
+ }
+
+ /* Instead of just restoring the non-volatile registers, do all
+ of the registers for now. This will incur a performance hit,
+ but it's rare enough not to cause too much of a problem, and
+ might be useful in some cases. */
+ c->dwarf.loc[UNW_PPC64_R0] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R0, 0);
+ c->dwarf.loc[UNW_PPC64_R1] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R1, 0);
+ c->dwarf.loc[UNW_PPC64_R2] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R2, 0);
+ c->dwarf.loc[UNW_PPC64_R3] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R3, 0);
+ c->dwarf.loc[UNW_PPC64_R4] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R4, 0);
+ c->dwarf.loc[UNW_PPC64_R5] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R5, 0);
+ c->dwarf.loc[UNW_PPC64_R6] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R6, 0);
+ c->dwarf.loc[UNW_PPC64_R7] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R7, 0);
+ c->dwarf.loc[UNW_PPC64_R8] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R8, 0);
+ c->dwarf.loc[UNW_PPC64_R9] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R9, 0);
+ c->dwarf.loc[UNW_PPC64_R10] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R10, 0);
+ c->dwarf.loc[UNW_PPC64_R11] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R11, 0);
+ c->dwarf.loc[UNW_PPC64_R12] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R12, 0);
+ c->dwarf.loc[UNW_PPC64_R13] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R13, 0);
+ c->dwarf.loc[UNW_PPC64_R14] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R14, 0);
+ c->dwarf.loc[UNW_PPC64_R15] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R15, 0);
+ c->dwarf.loc[UNW_PPC64_R16] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R16, 0);
+ c->dwarf.loc[UNW_PPC64_R17] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R17, 0);
+ c->dwarf.loc[UNW_PPC64_R18] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R18, 0);
+ c->dwarf.loc[UNW_PPC64_R19] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R19, 0);
+ c->dwarf.loc[UNW_PPC64_R20] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R20, 0);
+ c->dwarf.loc[UNW_PPC64_R21] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R21, 0);
+ c->dwarf.loc[UNW_PPC64_R22] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R22, 0);
+ c->dwarf.loc[UNW_PPC64_R23] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R23, 0);
+ c->dwarf.loc[UNW_PPC64_R24] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R24, 0);
+ c->dwarf.loc[UNW_PPC64_R25] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R25, 0);
+ c->dwarf.loc[UNW_PPC64_R26] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R26, 0);
+ c->dwarf.loc[UNW_PPC64_R27] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R27, 0);
+ c->dwarf.loc[UNW_PPC64_R28] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R28, 0);
+ c->dwarf.loc[UNW_PPC64_R29] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R29, 0);
+ c->dwarf.loc[UNW_PPC64_R30] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R30, 0);
+ c->dwarf.loc[UNW_PPC64_R31] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_R31, 0);
+
+ c->dwarf.loc[UNW_PPC64_LR] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_LINK, 0);
+ c->dwarf.loc[UNW_PPC64_CTR] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CTR, 0);
+ /* This CR0 assignment is probably wrong. There are 8 dwarf columns
+ assigned to the CR registers, but only one CR register in the
+ mcontext structure */
+ c->dwarf.loc[UNW_PPC64_CR0] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_CCR, 0);
+ c->dwarf.loc[UNW_PPC64_XER] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_XER, 0);
+ c->dwarf.loc[UNW_PPC64_NIP] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_GREGS_NIP, 0);
+
+ /* TODO: Is there a way of obtaining the value of the
+ pseudo frame pointer (which is sp + some fixed offset, I
+ assume), based on the contents of the ucontext record
+ structure? For now, set this loc to null. */
+ c->dwarf.loc[UNW_PPC64_FRAME_POINTER] = DWARF_NULL_LOC;
+
+ c->dwarf.loc[UNW_PPC64_F0] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R0, 0);
+ c->dwarf.loc[UNW_PPC64_F1] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R1, 0);
+ c->dwarf.loc[UNW_PPC64_F2] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R2, 0);
+ c->dwarf.loc[UNW_PPC64_F3] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R3, 0);
+ c->dwarf.loc[UNW_PPC64_F4] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R4, 0);
+ c->dwarf.loc[UNW_PPC64_F5] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R5, 0);
+ c->dwarf.loc[UNW_PPC64_F6] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R6, 0);
+ c->dwarf.loc[UNW_PPC64_F7] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R7, 0);
+ c->dwarf.loc[UNW_PPC64_F8] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R8, 0);
+ c->dwarf.loc[UNW_PPC64_F9] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R9, 0);
+ c->dwarf.loc[UNW_PPC64_F10] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R10, 0);
+ c->dwarf.loc[UNW_PPC64_F11] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R11, 0);
+ c->dwarf.loc[UNW_PPC64_F12] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R12, 0);
+ c->dwarf.loc[UNW_PPC64_F13] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R13, 0);
+ c->dwarf.loc[UNW_PPC64_F14] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R14, 0);
+ c->dwarf.loc[UNW_PPC64_F15] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R15, 0);
+ c->dwarf.loc[UNW_PPC64_F16] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R16, 0);
+ c->dwarf.loc[UNW_PPC64_F17] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R17, 0);
+ c->dwarf.loc[UNW_PPC64_F18] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R18, 0);
+ c->dwarf.loc[UNW_PPC64_F19] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R19, 0);
+ c->dwarf.loc[UNW_PPC64_F20] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R20, 0);
+ c->dwarf.loc[UNW_PPC64_F21] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R21, 0);
+ c->dwarf.loc[UNW_PPC64_F22] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R22, 0);
+ c->dwarf.loc[UNW_PPC64_F23] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R23, 0);
+ c->dwarf.loc[UNW_PPC64_F24] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R24, 0);
+ c->dwarf.loc[UNW_PPC64_F25] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R25, 0);
+ c->dwarf.loc[UNW_PPC64_F26] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R26, 0);
+ c->dwarf.loc[UNW_PPC64_F27] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R27, 0);
+ c->dwarf.loc[UNW_PPC64_F28] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R28, 0);
+ c->dwarf.loc[UNW_PPC64_F29] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R29, 0);
+ c->dwarf.loc[UNW_PPC64_F30] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R30, 0);
+ c->dwarf.loc[UNW_PPC64_F31] =
+ DWARF_LOC (ucontext + UC_MCONTEXT_FREGS_R31, 0);
+ /* Note that there is no .eh_section register column for the
+ FPSCR register. I don't know why this is. */
+
+ v_regs_loc = DWARF_LOC (ucontext + UC_MCONTEXT_V_REGS, 0);
+ ret = dwarf_get (&c->dwarf, v_regs_loc, &v_regs_ptr);
+ if (ret < 0)
+ {
+ Debug (2, "returning %d\n", ret);
+ return ret;
+ }
+ if (v_regs_ptr != 0)
+ {
+ /* The v_regs_ptr is not null. Set all of the AltiVec locs */
+
+ c->dwarf.loc[UNW_PPC64_V0] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R0, 0);
+ c->dwarf.loc[UNW_PPC64_V1] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R1, 0);
+ c->dwarf.loc[UNW_PPC64_V2] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R2, 0);
+ c->dwarf.loc[UNW_PPC64_V3] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R3, 0);
+ c->dwarf.loc[UNW_PPC64_V4] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R4, 0);
+ c->dwarf.loc[UNW_PPC64_V5] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R5, 0);
+ c->dwarf.loc[UNW_PPC64_V6] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R6, 0);
+ c->dwarf.loc[UNW_PPC64_V7] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R7, 0);
+ c->dwarf.loc[UNW_PPC64_V8] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R8, 0);
+ c->dwarf.loc[UNW_PPC64_V9] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R9, 0);
+ c->dwarf.loc[UNW_PPC64_V10] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R10, 0);
+ c->dwarf.loc[UNW_PPC64_V11] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R11, 0);
+ c->dwarf.loc[UNW_PPC64_V12] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R12, 0);
+ c->dwarf.loc[UNW_PPC64_V13] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R13, 0);
+ c->dwarf.loc[UNW_PPC64_V14] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R14, 0);
+ c->dwarf.loc[UNW_PPC64_V15] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R15, 0);
+ c->dwarf.loc[UNW_PPC64_V16] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R16, 0);
+ c->dwarf.loc[UNW_PPC64_V17] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R17, 0);
+ c->dwarf.loc[UNW_PPC64_V18] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R18, 0);
+ c->dwarf.loc[UNW_PPC64_V19] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R19, 0);
+ c->dwarf.loc[UNW_PPC64_V20] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R20, 0);
+ c->dwarf.loc[UNW_PPC64_V21] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R21, 0);
+ c->dwarf.loc[UNW_PPC64_V22] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R22, 0);
+ c->dwarf.loc[UNW_PPC64_V23] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R23, 0);
+ c->dwarf.loc[UNW_PPC64_V24] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R24, 0);
+ c->dwarf.loc[UNW_PPC64_V25] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R25, 0);
+ c->dwarf.loc[UNW_PPC64_V26] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R26, 0);
+ c->dwarf.loc[UNW_PPC64_V27] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R27, 0);
+ c->dwarf.loc[UNW_PPC64_V28] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R28, 0);
+ c->dwarf.loc[UNW_PPC64_V29] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R29, 0);
+ c->dwarf.loc[UNW_PPC64_V30] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R30, 0);
+ c->dwarf.loc[UNW_PPC64_V31] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_R31, 0);
+ c->dwarf.loc[UNW_PPC64_VRSAVE] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_VRSAVE, 0);
+ c->dwarf.loc[UNW_PPC64_VSCR] =
+ DWARF_LOC (v_regs_ptr + UC_MCONTEXT_VREGS_VSCR, 0);
+ }
+ else
+ {
+ c->dwarf.loc[UNW_PPC64_V0] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V1] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V2] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V3] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V4] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V5] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V6] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V7] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V8] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V9] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V10] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V11] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V12] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V13] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V14] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V15] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V16] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V17] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V18] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V19] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V20] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V21] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V22] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V23] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V24] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V25] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V26] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V27] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V28] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V29] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V30] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_V31] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_VRSAVE] = DWARF_NULL_LOC;
+ c->dwarf.loc[UNW_PPC64_VSCR] = DWARF_NULL_LOC;
+ }
+ ret = 1;
+ }
}
+
+ if (c->dwarf.ip == 0)
+ {
+ /* Unless the cursor or stack is corrupt or uninitialized,
+ we've most likely hit the top of the stack */
+ Debug (2, "returning 0\n");
+ return 0;
+ }
+
+ // on ppc64, R2 register is used as pointer to TOC
+ // section which is used for symbol lookup in PIC code
+ // ppc64 linker generates "ld r2, 40(r1)" (ELFv1) or
+ // "ld r2, 24(r1)" (ELFv2) instruction after each
+ // @plt call. We need restore R2, but only for @plt calls
+ {
+ unw_word_t ip = c->dwarf.ip;
+ unw_addr_space_t as = c->dwarf.as;
+ unw_accessors_t *a = unw_get_accessors (as);
+ void *arg = c->dwarf.as_arg;
+ uint32_t toc_save = (as->abi == UNW_PPC64_ABI_ELFv2)? 24 : 40;
+ int32_t inst;
+
+ if (fetch32 (as, a, &ip, &inst, arg) >= 0
+ && (uint32_t)inst == (0xE8410000U + toc_save))
+ {
+ // @plt call, restoring R2 from CFA+toc_save
+ c->dwarf.loc[UNW_PPC64_R2] = DWARF_LOC(c->dwarf.cfa + toc_save, 0);
+ }
+ }
+
+ Debug (2, "returning %d with last return statement\n", ret);
return ret;
}
projects / platform / upstream / libunwind.git / blobdiff