+2015-01-21 Wei-cheng Wang <cole945@gmail.com>
+
+ * ppc-linux-tdep.c (ppc_skip_trampoline_code,
+ ppc_canonicalize_syscall, ppc_linux_syscall_record,
+ ppc_linux_record_signal, ppc_init_linux_record_tdep): Add comments.
+ * ppc64-tdep.c (ppc64_skip_trampoline_code): Likewise.
+ * rs6000-tdep.c (rs6000_epilogue_frame_cache,
+ rs6000_epilogue_frame_this_id, rs6000_epilogue_frame_prev_register,
+ rs6000_epilogue_frame_sniffer, ppc_record_vsr, ppc_process_record_op4,
+ ppc_process_record_op19, ppc_process_record_op31,
+ ppc_process_record_op59, ppc_process_record_op60,
+ ppc_process_record_op63): Likewise.
+
2015-01-20 Joel Brobecker <brobecker@adacore.com>
* nat/linux-ptrace.c (linux_ptrace_attach_fail_reason_string)
return 0;
}
-/* Follow PLT stub to actual routine. */
+/* Follow PLT stub to actual routine.
+
+ When the execution direction is EXEC_REVERSE, scan backward to
+ check whether we are in the middle of a PLT stub. Currently,
+ we only look-behind at most 4 instructions (the max length of PLT
+ stub sequence. */
static CORE_ADDR
ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
static struct linux_record_tdep ppc_linux_record_tdep;
static struct linux_record_tdep ppc64_linux_record_tdep;
+/* ppc_canonicalize_syscall maps from the native PowerPC Linux set of
+ syscall ids into a canonical set of syscall ids used by process
+ record. (See arch/powerpc/include/uapi/asm/unistd.h in kernel tree.)
+ Return -1 if this system call is not supported by process record.
+ Otherwise, return the syscall number for preocess reocrd of given
+ SYSCALL. */
+
static enum gdb_syscall
ppc_canonicalize_syscall (int syscall)
{
- /* See arch/powerpc/include/uapi/asm/unistd.h */
-
if (syscall <= 165)
return syscall;
else if (syscall >= 167 && syscall <= 190) /* Skip query_module 166 */
return -1;
}
+/* Record registers which might be clobbered during system call.
+ Return 0 if successful. */
+
static int
ppc_linux_syscall_record (struct regcache *regcache)
{
return 0;
}
+/* Record registers which might be clobbered during signal handling.
+ Return 0 if successful. */
+
static int
ppc_linux_record_signal (struct gdbarch *gdbarch, struct regcache *regcache,
enum gdb_signal signal)
ppu2spu_prev_arch,
};
-/* Initialize linux_record_tdep if not initialized yet. */
+/* Initialize linux_record_tdep if not initialized yet.
+ WORDSIZE is 4 or 8 for 32- or 64-bit PowerPC Linux respectively.
+ Sizes of data structures are initialized accordingly. */
static void
ppc_init_linux_record_tdep (struct linux_record_tdep *record_tdep,
default_frame_sniffer
};
+/* Allocate and initialize a frame cache for an epilogue frame.
+ SP is restored and prev-PC is stored in LR. */
+
static struct rs6000_frame_cache *
rs6000_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache)
{
return cache;
}
+/* Implementation of frame_unwind.this_id, as defined in frame_unwind.h.
+ Return the frame ID of an epilogue frame. */
+
static void
rs6000_epilogue_frame_this_id (struct frame_info *this_frame,
void **this_cache, struct frame_id *this_id)
(*this_id) = frame_id_build (info->base, pc);
}
+/* Implementation of frame_unwind.prev_register, as defined in frame_unwind.h.
+ Return the register value of REGNUM in previous frame. */
+
static struct value *
rs6000_epilogue_frame_prev_register (struct frame_info *this_frame,
void **this_cache, int regnum)
return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
}
+/* Implementation of frame_unwind.sniffer, as defined in frame_unwind.h.
+ Check whether this an epilogue frame. */
+
static int
rs6000_epilogue_frame_sniffer (const struct frame_unwind *self,
struct frame_info *this_frame,
return 0;
}
+/* Frame unwinder for epilogue frame. This is required for reverse step-over
+ a function without debug information. */
+
static const struct frame_unwind rs6000_epilogue_frame_unwind =
{
NORMAL_FRAME,
#define PPC_XT(insn) ((PPC_TX (insn) << 5) | PPC_T (insn))
#define PPC_XER_NB(xer) (xer & 0x7f)
-/* Record Vector-Scalar Registers. */
+/* Record Vector-Scalar Registers.
+ For VSR less than 32, it's represented by an FPR and an VSR-upper register.
+ Otherwise, it's just a VR register. Record them accordingly. */
static int
ppc_record_vsr (struct regcache *regcache, struct gdbarch_tdep *tdep, int vsr)
return 0;
}
-/* Parse instructions of primary opcode-4. */
+/* Parse and record instructions primary opcode-4 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op4 (struct gdbarch *gdbarch, struct regcache *regcache,
- CORE_ADDR addr, uint32_t insn)
+ CORE_ADDR addr, uint32_t insn)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
int ext = PPC_FIELD (insn, 21, 11);
return -1;
}
-/* Parse instructions of primary opcode-19. */
+/* Parse and record instructions of primary opcode-19 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op19 (struct gdbarch *gdbarch, struct regcache *regcache,
return -1;
}
-/* Parse instructions of primary opcode-31. */
+/* Parse and record instructions of primary opcode-31 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op31 (struct gdbarch *gdbarch, struct regcache *regcache,
return -1;
}
-/* Parse instructions of primary opcode-59. */
+/* Parse and record instructions of primary opcode-59 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op59 (struct gdbarch *gdbarch, struct regcache *regcache,
return -1;
}
-/* Parse instructions of primary opcode-60. */
+/* Parse and record instructions of primary opcode-60 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op60 (struct gdbarch *gdbarch, struct regcache *regcache,
return -1;
}
-/* Parse instructions of primary opcode-63. */
+/* Parse and record instructions of primary opcode-63 at ADDR.
+ Return 0 if successful. */
static int
ppc_process_record_op63 (struct gdbarch *gdbarch, struct regcache *regcache,
projects / binutils-gdb.git / commitdiff