You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "frame.h"
/*#include <sys/user.h> After a.out.h */
#include <sys/file.h>
-#include <sys/stat.h>
+#include "gdb_stat.h"
#include "wait.h"
#include "gdbcore.h"
#include "symfile.h"
#include "objfiles.h"
-#define SWAP_TARGET_AND_HOST(buffer,len) \
- do \
- { \
- if (TARGET_BYTE_ORDER != HOST_BYTE_ORDER) \
- { \
- char tmp; \
- char *p = (char *)(buffer); \
- char *q = ((char *)(buffer)) + len - 1; \
- for (; p < q; p++, q--) \
- { \
- tmp = *q; \
- *q = *p; \
- *p = tmp; \
- } \
- } \
- } \
- while (0)
-
static int restore_pc_queue PARAMS ((struct frame_saved_regs *));
static int hppa_alignof PARAMS ((struct type *));
(word & 0x1) << 11, 12) << 2;
}
+/* Deposit a 17 bit constant in an instruction (like bl). */
+
+unsigned int
+deposit_17 (opnd, word)
+ unsigned opnd, word;
+{
+ word |= GET_FIELD (opnd, 15 + 0, 15 + 0); /* w */
+ word |= GET_FIELD (opnd, 15 + 1, 15 + 5) << 16; /* w1 */
+ word |= GET_FIELD (opnd, 15 + 6, 15 + 6) << 2; /* w2[10] */
+ word |= GET_FIELD (opnd, 15 + 7, 15 + 16) << 3; /* w2[0..9] */
+
+ return word;
+}
+
/* extract a 17 bit constant from branch instructions, returning the
19 bit signed value. */
struct obj_unwind_info *ui;
text_offset = ANOFFSET (objfile->section_offsets, 0);
- ui = obstack_alloc (&objfile->psymbol_obstack,
- sizeof (struct obj_unwind_info));
+ ui = (struct obj_unwind_info *)obstack_alloc (&objfile->psymbol_obstack,
+ sizeof (struct obj_unwind_info));
ui->table = NULL;
ui->cache = NULL;
if (pc_in_interrupt_handler (pc))
return read_memory_integer (frame->frame + PC_REGNUM * 4, 4) & ~0x3;
+#ifdef FRAME_SAVED_PC_IN_SIGTRAMP
/* Deal with signal handler caller frames too. */
if (frame->signal_handler_caller)
{
FRAME_SAVED_PC_IN_SIGTRAMP (frame, &rp);
return rp & ~0x3;
}
+#endif
if (frameless_function_invocation (frame))
{
}
/* If PC is inside a linker stub, then dig out the address the stub
- will return to. */
+ will return to.
+
+ Don't do this for long branch stubs. Why? For some unknown reason
+ _start is marked as a long branch stub in hpux10. */
u = find_unwind_entry (pc);
- if (u && u->stub_type != 0)
- goto restart;
+ if (u && u->stub_type != 0
+ && u->stub_type != LONG_BRANCH)
+ {
+ unsigned int insn;
+
+ /* If this is a dynamic executable, and we're in a signal handler,
+ then the call chain will eventually point us into the stub for
+ _sigreturn. Unlike most cases, we'll be pointed to the branch
+ to the real sigreturn rather than the code after the real branch!.
+
+ Else, try to dig the address the stub will return to in the normal
+ fashion. */
+ insn = read_memory_integer (pc, 4);
+ if ((insn & 0xfc00e000) == 0xe8000000)
+ return (pc + extract_17 (insn) + 8) & ~0x3;
+ else
+ goto restart;
+ }
return pc;
}
int my_framesize, caller_framesize;
struct unwind_table_entry *u;
CORE_ADDR frame_base;
+ struct frame_info *tmp_frame;
/* Handle HPUX, BSD, and OSF1 style interrupt frames first. These
are easy; at *sp we have a full save state strucutre which we can
code to dig a saved PC out of the save state structure. */
if (pc_in_interrupt_handler (frame->pc))
frame_base = read_memory_integer (frame->frame + SP_REGNUM * 4, 4);
+#ifdef FRAME_BASE_BEFORE_SIGTRAMP
else if (frame->signal_handler_caller)
{
FRAME_BASE_BEFORE_SIGTRAMP (frame, &frame_base);
}
+#endif
else
frame_base = frame->frame;
We use information from unwind descriptors to determine if %r3
is saved into the stack (Entry_GR field has this information). */
- while (frame)
+ tmp_frame = frame;
+ while (tmp_frame)
{
- u = find_unwind_entry (frame->pc);
+ u = find_unwind_entry (tmp_frame->pc);
if (!u)
{
think anyone has actually written any tools (not even "strip")
which leave them out of an executable, so maybe this is a moot
point. */
- warning ("Unable to find unwind for PC 0x%x -- Help!", frame->pc);
+ warning ("Unable to find unwind for PC 0x%x -- Help!", tmp_frame->pc);
return 0;
}
/* Entry_GR specifies the number of callee-saved general registers
saved in the stack. It starts at %r3, so %r3 would be 1. */
if (u->Entry_GR >= 1 || u->Save_SP
- || frame->signal_handler_caller
- || pc_in_interrupt_handler (frame->pc))
+ || tmp_frame->signal_handler_caller
+ || pc_in_interrupt_handler (tmp_frame->pc))
break;
else
- frame = frame->next;
+ tmp_frame = tmp_frame->next;
}
- if (frame)
+ if (tmp_frame)
{
/* We may have walked down the chain into a function with a frame
pointer. */
if (u->Save_SP
- && !frame->signal_handler_caller
- && !pc_in_interrupt_handler (frame->pc))
- return read_memory_integer (frame->frame, 4);
+ && !tmp_frame->signal_handler_caller
+ && !pc_in_interrupt_handler (tmp_frame->pc))
+ return read_memory_integer (tmp_frame->frame, 4);
/* %r3 was saved somewhere in the stack. Dig it out. */
else
{
struct frame_saved_regs saved_regs;
- get_frame_saved_regs (frame, &saved_regs);
+ /* Sick.
+
+ For optimization purposes many kernels don't have the
+ callee saved registers into the save_state structure upon
+ entry into the kernel for a syscall; the optimization
+ is usually turned off if the process is being traced so
+ that the debugger can get full register state for the
+ process.
+
+ This scheme works well except for two cases:
+
+ * Attaching to a process when the process is in the
+ kernel performing a system call (debugger can't get
+ full register state for the inferior process since
+ the process wasn't being traced when it entered the
+ system call).
+
+ * Register state is not complete if the system call
+ causes the process to core dump.
+
+
+ The following heinous code is an attempt to deal with
+ the lack of register state in a core dump. It will
+ fail miserably if the function which performs the
+ system call has a variable sized stack frame. */
+
+ get_frame_saved_regs (tmp_frame, &saved_regs);
+
+ /* Abominable hack. */
+ if (current_target.to_has_execution == 0
+ && ((saved_regs.regs[FLAGS_REGNUM]
+ && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4)
+ & 0x2))
+ || (saved_regs.regs[FLAGS_REGNUM] == 0
+ && read_register (FLAGS_REGNUM) & 0x2)))
+ {
+ u = find_unwind_entry (FRAME_SAVED_PC (frame));
+ if (!u)
+ return read_memory_integer (saved_regs.regs[FP_REGNUM], 4);
+ else
+ return frame_base - (u->Total_frame_size << 3);
+ }
+
return read_memory_integer (saved_regs.regs[FP_REGNUM], 4);
}
}
else
{
+ struct frame_saved_regs saved_regs;
+
+ /* Get the innermost frame. */
+ tmp_frame = frame;
+ while (tmp_frame->next != NULL)
+ tmp_frame = tmp_frame->next;
+
+ get_frame_saved_regs (tmp_frame, &saved_regs);
+ /* Abominable hack. See above. */
+ if (current_target.to_has_execution == 0
+ && ((saved_regs.regs[FLAGS_REGNUM]
+ && (read_memory_integer (saved_regs.regs[FLAGS_REGNUM], 4)
+ & 0x2))
+ || (saved_regs.regs[FLAGS_REGNUM] == 0
+ && read_register (FLAGS_REGNUM) & 0x2)))
+ {
+ u = find_unwind_entry (FRAME_SAVED_PC (frame));
+ if (!u)
+ return read_memory_integer (saved_regs.regs[FP_REGNUM], 4);
+ else
+ return frame_base - (u->Total_frame_size << 3);
+ }
+
/* The value in %r3 was never saved into the stack (thus %r3 still
holds the value of the previous frame pointer). */
return read_register (FP_REGNUM);
&& SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
return 0;
+ /* Grrrr. Some new idiot decided that they don't want _start for the
+ PRO configurations; $START$ calls main directly.... Deal with it. */
+ msym_start = lookup_minimal_symbol ("$START$", NULL, NULL);
+ if (msym_us
+ && msym_start
+ && SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
+ return 0;
+
next = get_next_frame (thisframe);
if (next)
next_u = find_unwind_entry (next->pc);
struct type *type;
int gcc_p;
{
- CORE_ADDR dyncall_addr, sr4export_addr;
+ CORE_ADDR dyncall_addr;
struct minimal_symbol *msymbol;
+ struct minimal_symbol *trampoline;
int flags = read_register (FLAGS_REGNUM);
struct unwind_table_entry *u;
+ trampoline = NULL;
msymbol = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
if (msymbol == NULL)
error ("Can't find an address for $$dyncall trampoline");
if (u && u->stub_type == IMPORT)
{
CORE_ADDR new_fun;
- msymbol = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
- if (msymbol == NULL)
- msymbol = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
- if (msymbol == NULL)
+ /* Prefer __gcc_plt_call over the HP supplied routine because
+ __gcc_plt_call works for any number of arguments. */
+ trampoline = lookup_minimal_symbol ("__gcc_plt_call", NULL, NULL);
+ if (trampoline == NULL)
+ trampoline = lookup_minimal_symbol ("__d_plt_call", NULL, NULL);
+
+ if (trampoline == NULL)
error ("Can't find an address for __d_plt_call or __gcc_plt_call trampoline");
/* This is where sr4export will jump to. */
- new_fun = SYMBOL_VALUE_ADDRESS (msymbol);
+ new_fun = SYMBOL_VALUE_ADDRESS (trampoline);
- if (strcmp (SYMBOL_NAME (msymbol), "__d_plt_call"))
- write_register (22, fun);
- else
+ if (strcmp (SYMBOL_NAME (trampoline), "__d_plt_call") == 0)
{
/* We have to store the address of the stub in __shlib_funcptr. */
msymbol = lookup_minimal_symbol ("__shlib_funcptr", NULL,
error ("Can't find an address for __shlib_funcptr");
target_write_memory (SYMBOL_VALUE_ADDRESS (msymbol), (char *)&fun, 4);
+
+ /* We want sr4export to call __d_plt_call, so we claim it is
+ the final target. Clear trampoline. */
+ fun = new_fun;
+ trampoline = NULL;
}
- fun = new_fun;
}
- /* We still need sr4export's address too. */
- msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL);
- if (msymbol == NULL)
- error ("Can't find an address for _sr4export trampoline");
-
- sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol);
-
+ /* Store upper 21 bits of function address into ldil. fun will either be
+ the final target (most cases) or __d_plt_call when calling into a shared
+ library and __gcc_plt_call is not available. */
store_unsigned_integer
- (&dummy[9*REGISTER_SIZE],
- REGISTER_SIZE,
+ (&dummy[FUNC_LDIL_OFFSET],
+ INSTRUCTION_SIZE,
deposit_21 (fun >> 11,
- extract_unsigned_integer (&dummy[9*REGISTER_SIZE],
- REGISTER_SIZE)));
+ extract_unsigned_integer (&dummy[FUNC_LDIL_OFFSET],
+ INSTRUCTION_SIZE)));
+
+ /* Store lower 11 bits of function address into ldo */
store_unsigned_integer
- (&dummy[10*REGISTER_SIZE],
- REGISTER_SIZE,
+ (&dummy[FUNC_LDO_OFFSET],
+ INSTRUCTION_SIZE,
deposit_14 (fun & MASK_11,
- extract_unsigned_integer (&dummy[10*REGISTER_SIZE],
- REGISTER_SIZE)));
- store_unsigned_integer
- (&dummy[12*REGISTER_SIZE],
- REGISTER_SIZE,
- deposit_21 (sr4export_addr >> 11,
- extract_unsigned_integer (&dummy[12*REGISTER_SIZE],
- REGISTER_SIZE)));
- store_unsigned_integer
- (&dummy[13*REGISTER_SIZE],
- REGISTER_SIZE,
- deposit_14 (sr4export_addr & MASK_11,
- extract_unsigned_integer (&dummy[13*REGISTER_SIZE],
- REGISTER_SIZE)));
+ extract_unsigned_integer (&dummy[FUNC_LDO_OFFSET],
+ INSTRUCTION_SIZE)));
+#ifdef SR4EXPORT_LDIL_OFFSET
+
+ {
+ CORE_ADDR trampoline_addr;
+
+ /* We may still need sr4export's address too. */
+
+ if (trampoline == NULL)
+ {
+ msymbol = lookup_minimal_symbol ("_sr4export", NULL, NULL);
+ if (msymbol == NULL)
+ error ("Can't find an address for _sr4export trampoline");
+
+ trampoline_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+ }
+ else
+ trampoline_addr = SYMBOL_VALUE_ADDRESS (trampoline);
+
+
+ /* Store upper 21 bits of trampoline's address into ldil */
+ store_unsigned_integer
+ (&dummy[SR4EXPORT_LDIL_OFFSET],
+ INSTRUCTION_SIZE,
+ deposit_21 (trampoline_addr >> 11,
+ extract_unsigned_integer (&dummy[SR4EXPORT_LDIL_OFFSET],
+ INSTRUCTION_SIZE)));
+
+ /* Store lower 11 bits of trampoline's address into ldo */
+ store_unsigned_integer
+ (&dummy[SR4EXPORT_LDO_OFFSET],
+ INSTRUCTION_SIZE,
+ deposit_14 (trampoline_addr & MASK_11,
+ extract_unsigned_integer (&dummy[SR4EXPORT_LDO_OFFSET],
+ INSTRUCTION_SIZE)));
+ }
+#endif
write_register (22, pc);
alignment required by their fields. */
static int
-hppa_alignof (arg)
- struct type *arg;
+hppa_alignof (type)
+ struct type *type;
{
int max_align, align, i;
- switch (TYPE_CODE (arg))
+ CHECK_TYPEDEF (type);
+ switch (TYPE_CODE (type))
{
case TYPE_CODE_PTR:
case TYPE_CODE_INT:
case TYPE_CODE_FLT:
- return TYPE_LENGTH (arg);
+ return TYPE_LENGTH (type);
case TYPE_CODE_ARRAY:
- return hppa_alignof (TYPE_FIELD_TYPE (arg, 0));
+ return hppa_alignof (TYPE_FIELD_TYPE (type, 0));
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
max_align = 2;
- for (i = 0; i < TYPE_NFIELDS (arg); i++)
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
{
/* Bit fields have no real alignment. */
- if (!TYPE_FIELD_BITPOS (arg, i))
+ if (!TYPE_FIELD_BITPOS (type, i))
{
- align = hppa_alignof (TYPE_FIELD_TYPE (arg, i));
+ align = hppa_alignof (TYPE_FIELD_TYPE (type, i));
max_align = max (max_align, align);
}
}
{
for (j = 0; j < 4; j++)
{
- val = *(int *)(raw_regs + REGISTER_BYTE (i+(j*18)));
- SWAP_TARGET_AND_HOST (&val, 4);
+ val =
+ extract_signed_integer (raw_regs + REGISTER_BYTE (i+(j*18)), 4);
printf_unfiltered ("%8.8s: %8x ", reg_names[i+(j*18)], val);
}
printf_unfiltered ("\n");
CORE_ADDR pc;
{
char buf[4];
+ CORE_ADDR orig_pc = pc;
unsigned long inst, stack_remaining, save_gr, save_fr, save_rp, save_sp;
- unsigned long args_stored, status, i;
+ unsigned long args_stored, status, i, restart_gr, restart_fr;
struct unwind_table_entry *u;
+ restart_gr = 0;
+ restart_fr = 0;
+
+restart:
u = find_unwind_entry (pc);
if (!u)
return pc;
/* An indication that args may be stored into the stack. Unfortunately
the HPUX compilers tend to set this in cases where no args were
stored too!. */
- args_stored = u->Args_stored;
+ args_stored = 1;
/* Turn the Entry_GR field into a bitmask. */
save_gr = 0;
save_gr |= (1 << i);
}
+ save_gr &= ~restart_gr;
/* Turn the Entry_FR field into a bitmask too. */
save_fr = 0;
for (i = 12; i < u->Entry_FR + 12; i++)
save_fr |= (1 << i);
+ save_fr &= ~restart_fr;
/* Loop until we find everything of interest or hit a branch.
pc += 4;
}
+ /* We've got a tenative location for the end of the prologue. However
+ because of limitations in the unwind descriptor mechanism we may
+ have went too far into user code looking for the save of a register
+ that does not exist. So, if there registers we expected to be saved
+ but never were, mask them out and restart.
+
+ This should only happen in optimized code, and should be very rare. */
+ if (save_gr || save_fr
+ && ! (restart_fr || restart_gr))
+ {
+ pc = orig_pc;
+ restart_gr = save_gr;
+ restart_fr = save_fr;
+ goto restart;
+ }
+
return pc;
}
return;
}
+#ifdef FRAME_FIND_SAVED_REGS_IN_SIGTRAMP
/* Handle signal handler callers. */
if (frame_info->signal_handler_caller)
{
FRAME_FIND_SAVED_REGS_IN_SIGTRAMP (frame_info, frame_saved_regs);
return;
}
+#endif
/* Get the starting address of the function referred to by the PC
saved in frame. */
int from_tty;
{
CORE_ADDR address;
- union
- {
- int *foo;
- struct unwind_table_entry *u;
- } xxx;
+ struct unwind_table_entry *u;
/* If we have an expression, evaluate it and use it as the address. */
else
return;
- xxx.u = find_unwind_entry (address);
+ u = find_unwind_entry (address);
- if (!xxx.u)
+ if (!u)
{
- printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address);
+ printf_unfiltered ("Can't find unwind table entry for %s\n", exp);
return;
}
- printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2],
- xxx.foo[3]);
+ printf_unfiltered ("unwind_table_entry (0x%x):\n", u);
+
+ printf_unfiltered ("\tregion_start = ");
+ print_address (u->region_start, gdb_stdout);
+
+ printf_unfiltered ("\n\tregion_end = ");
+ print_address (u->region_end, gdb_stdout);
+
+#ifdef __STDC__
+#define pif(FLD) if (u->FLD) printf_unfiltered (" "#FLD);
+#else
+#define pif(FLD) if (u->FLD) printf_unfiltered (" FLD");
+#endif
+
+ printf_unfiltered ("\n\tflags =");
+ pif (Cannot_unwind);
+ pif (Millicode);
+ pif (Millicode_save_sr0);
+ pif (Entry_SR);
+ pif (Args_stored);
+ pif (Variable_Frame);
+ pif (Separate_Package_Body);
+ pif (Frame_Extension_Millicode);
+ pif (Stack_Overflow_Check);
+ pif (Two_Instruction_SP_Increment);
+ pif (Ada_Region);
+ pif (Save_SP);
+ pif (Save_RP);
+ pif (Save_MRP_in_frame);
+ pif (extn_ptr_defined);
+ pif (Cleanup_defined);
+ pif (MPE_XL_interrupt_marker);
+ pif (HP_UX_interrupt_marker);
+ pif (Large_frame);
+
+ putchar_unfiltered ('\n');
+
+#ifdef __STDC__
+#define pin(FLD) printf_unfiltered ("\t"#FLD" = 0x%x\n", u->FLD);
+#else
+#define pin(FLD) printf_unfiltered ("\tFLD = 0x%x\n", u->FLD);
+#endif
+
+ pin (Region_description);
+ pin (Entry_FR);
+ pin (Entry_GR);
+ pin (Total_frame_size);
}
#endif /* MAINTENANCE_CMDS */
projects / deliverable / binutils-gdb.git / blobdiff