#include "linux-tdep.h"
#include "linux-record.h"
#include "record-full.h"
+#include "infrun.h"
#include "stap-probe.h"
#include "ax.h"
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)
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR target = 0;
+ int scan_limit, i;
- if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
- {
- /* Insn pattern is
- lis r11, xxxx
- lwz r11, xxxx(r11)
- Branch target is in r11. */
-
- target = (ppc_insn_d_field (insnbuf[0]) << 16)
- | ppc_insn_d_field (insnbuf[1]);
- target = read_memory_unsigned_integer (target, 4, byte_order);
- }
+ scan_limit = 1;
+ /* When reverse-debugging, scan backward to check whether we are
+ in the middle of trampoline code. */
+ if (execution_direction == EXEC_REVERSE)
+ scan_limit = 4; /* At more 4 instructions. */
- if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf))
+ for (i = 0; i < scan_limit; i++)
{
- /* Insn pattern is
- lwz r11, xxxx(r30)
- Branch target is in r11. */
+ if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
+ {
+ /* Insn pattern is
+ lis r11, xxxx
+ lwz r11, xxxx(r11)
+ Branch target is in r11. */
+
+ target = (ppc_insn_d_field (insnbuf[0]) << 16)
+ | ppc_insn_d_field (insnbuf[1]);
+ target = read_memory_unsigned_integer (target, 4, byte_order);
+ }
+ else if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so,
+ insnbuf))
+ {
+ /* Insn pattern is
+ lwz r11, xxxx(r30)
+ Branch target is in r11. */
+
+ target = get_frame_register_unsigned (frame,
+ tdep->ppc_gp0_regnum + 30)
+ + ppc_insn_d_field (insnbuf[0]);
+ target = read_memory_unsigned_integer (target, 4, byte_order);
+ }
+ else
+ {
+ /* Scan backward one more instructions if doesn't match. */
+ pc -= 4;
+ continue;
+ }
- target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30)
- + ppc_insn_d_field (insnbuf[0]);
- target = read_memory_unsigned_integer (target, 4, byte_order);
+ return target;
}
- return target;
+ return 0;
}
/* Wrappers to handle Linux-only registers. */
ppc64_linux_sighandler_cache_init
};
-
-/* Address to use for displaced stepping. When debugging a stand-alone
- SPU executable, entry_point_address () will point to an SPU local-store
- address and is thus not usable as displaced stepping location. We use
- the auxiliary vector to determine the PowerPC-side entry point address
- instead. */
-
-static CORE_ADDR ppc_linux_entry_point_addr = 0;
-
-static void
-ppc_linux_inferior_created (struct target_ops *target, int from_tty)
-{
- ppc_linux_entry_point_addr = 0;
-}
-
-static CORE_ADDR
-ppc_linux_displaced_step_location (struct gdbarch *gdbarch)
-{
- if (ppc_linux_entry_point_addr == 0)
- {
- CORE_ADDR addr;
-
- /* Determine entry point from target auxiliary vector. */
- if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0)
- error (_("Cannot find AT_ENTRY auxiliary vector entry."));
-
- /* Make certain that the address points at real code, and not a
- function descriptor. */
- addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr,
- ¤t_target);
-
- /* Inferior calls also use the entry point as a breakpoint location.
- We don't want displaced stepping to interfere with those
- breakpoints, so leave space. */
- ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE;
- }
-
- return ppc_linux_entry_point_addr;
-}
-
-
/* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */
int
ppc_linux_trap_reg_p (struct gdbarch *gdbarch)
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)
static int
ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data)
{
- return strncmp (bfd_section_name (abfd, asect), "SPU/", 4) == 0;
+ return startswith (bfd_section_name (abfd, asect), "SPU/");
}
static const struct target_desc *
if (!ptid_equal (spe_context_cache_ptid, inferior_ptid))
{
struct target_ops *target = ¤t_target;
- volatile struct gdb_exception ex;
- TRY_CATCH (ex, RETURN_MASK_ERROR)
+ TRY
{
/* We do not call target_translate_tls_address here, because
svr4_fetch_objfile_link_map may invalidate the frame chain,
spe_context_cache_ptid = inferior_ptid;
}
- if (ex.reason < 0)
- return 0;
+ CATCH (ex, RETURN_MASK_ERROR)
+ {
+ return 0;
+ }
+ END_CATCH
}
/* Read variable value. */
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,
/* Cell/B.E. cross-architecture unwinder support. */
frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind);
-
- /* The default displaced_step_at_entry_point doesn't work for
- SPU stand-alone executables. */
- set_gdbarch_displaced_step_location (gdbarch,
- ppc_linux_displaced_step_location);
}
- set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
+ set_gdbarch_displaced_step_location (gdbarch,
+ linux_displaced_step_location);
/* Support reverse debugging. */
set_gdbarch_process_record (gdbarch, ppc_process_record);
gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX,
ppc_linux_init_abi);
- /* Attach to inferior_created observer. */
- observer_attach_inferior_created (ppc_linux_inferior_created);
-
/* Attach to observers to track __spe_current_active_context. */
observer_attach_inferior_created (ppc_linux_spe_context_inferior_created);
observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded);
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