static int restore_pc_queue PARAMS ((struct frame_saved_regs *fsr));
static int hppa_alignof PARAMS ((struct type *arg));
+CORE_ADDR frame_saved_pc PARAMS ((FRAME frame));
\f
/* Routines to extract various sized constants out of hppa
return NULL;
}
+/* Called when no unwind descriptor was found for PC. Returns 1 if it
+ appears that PC is in a linker stub. */
+static int pc_in_linker_stub PARAMS ((CORE_ADDR));
+
+static int
+pc_in_linker_stub (pc)
+ CORE_ADDR pc;
+{
+ int found_magic_instruction = 0;
+ int i;
+
+ /* We are looking for something like
+
+ ; $$dyncall jams RP into this special spot in the frame (RP')
+ ; before calling the "call stub"
+ ldw -18(sp),rp
+
+ ldsid (rp),r1 ; Get space associated with RP into r1
+ mtsp r1,sp ; Move it into space register 0
+ be,n 0(sr0),rp) ; back to your regularly scheduled program
+ */
+
+ /* Maximum known linker stub size is 4 instructions. Search forward
+ from the given PC, then backward. */
+ for (i = 0; i < 4; i++)
+ {
+ /* If we hit something with an unwind, stop searching this direction.
+
+ if (find_unwind_entry (pc + i * 4) != 0)
+ break;
+
+ /* Check for ldsid (rp),r1 which is the magic instruction for a
+ return from a cross-space function call. */
+ if (read_memory_integer (pc + i * 4, 4) == 0x004010a1)
+ {
+ found_magic_instruction = 1;
+ break;
+ }
+ /* Add code to handle long call/branch and argument relocation stubs
+ here. */
+ }
+
+ if (found_magic_instruction != 0)
+ return 1;
+
+ /* Now look backward. */
+ for (i = 0; i < 4; i++)
+ {
+ /* If we hit something with an unwind, stop searching this direction.
+
+ if (find_unwind_entry (pc - i * 4) != 0)
+ break;
+
+ /* Check for ldsid (rp),r1 which is the magic instruction for a
+ return from a cross-space function call. */
+ if (read_memory_integer (pc - i * 4, 4) == 0x004010a1)
+ {
+ found_magic_instruction = 1;
+ break;
+ }
+ /* Add code to handle long call/branch and argument relocation stubs
+ here. */
+ }
+ return found_magic_instruction;
+}
+
static int
find_return_regnum(pc)
CORE_ADDR pc;
return RP_REGNUM;
}
+/* Return size of frame, or -1 if we should use a frame pointer. */
int
find_proc_framesize(pc)
CORE_ADDR pc;
u = find_unwind_entry (pc);
if (!u)
+ {
+ if (pc_in_linker_stub (pc))
+ /* Linker stubs have a zero size frame. */
+ return 0;
+ else
+ return -1;
+ }
+
+ if (u->Save_SP)
+ /* If this bit is set, it means there is a frame pointer and we should
+ use it. */
return -1;
return u->Total_frame_size << 3;
}
-int
-rp_saved(pc)
+/* Return offset from sp at which rp is saved, or 0 if not saved. */
+static int rp_saved PARAMS ((CORE_ADDR));
+
+static int
+rp_saved (pc)
+ CORE_ADDR pc;
{
struct unwind_table_entry *u;
u = find_unwind_entry (pc);
if (!u)
- return 0;
+ {
+ if (pc_in_linker_stub (pc))
+ /* This is the so-called RP'. */
+ return -24;
+ else
+ return 0;
+ }
if (u->Save_RP)
- return 1;
+ return -20;
else
return 0;
}
\f
+int
+frameless_function_invocation (frame)
+ FRAME frame;
+{
+
+ if (use_unwind)
+ {
+ struct unwind_table_entry *u;
+
+ u = find_unwind_entry (frame->pc);
+
+ if (u == 0)
+ return 0;
+
+ return (u->Total_frame_size == 0);
+ }
+ else
+ return frameless_look_for_prologue (frame);
+}
+
CORE_ADDR
saved_pc_after_call (frame)
FRAME frame;
{
CORE_ADDR pc = get_frame_pc (frame);
- if (frameless_look_for_prologue (frame))
+ if (frameless_function_invocation (frame))
{
int ret_regnum;
return read_register (ret_regnum) & ~0x3;
}
- else if (rp_saved (pc))
- return read_memory_integer (frame->frame - 20, 4) & ~0x3;
else
- return read_register (RP_REGNUM) & ~0x3;
+ {
+ int rp_offset = rp_saved (pc);
+
+ if (rp_offset == 0)
+ return read_register (RP_REGNUM) & ~0x3;
+ else
+ return read_memory_integer (frame->frame - rp_offset, 4) & ~0x3;
+ }
}
\f
/* We need to correct the PC and the FP for the outermost frame when we are
else
frame->frame = read_register (SP_REGNUM) - framesize;
- if (!frameless_look_for_prologue (frame)) /* Frameless? */
+ if (!frameless_function_invocation (frame)) /* Frameless? */
return; /* No, quit now */
/* For frameless functions, we need to look at the caller's frame */
u = find_unwind_entry (thisframe->pc);
- if (u && (u->Save_SP || u->Total_frame_size))
- return 1;
- else
+ if (u == NULL)
+ /* FIXME, we should probably fall back to some other technique,
+ if we want to deal gracefully with stripped executables or others
+ without unwind info. */
return 0;
+
+ if (u->Save_SP || u->Total_frame_size)
+ return 1;
+
+ if (pc_in_linker_stub (thisframe->pc))
+ return 1;
+
+ return 0;
}
else
{
CORE_ADDR struct_addr;
{
/* array of arguments' offsets */
- int *offset = (int *)alloca(nargs);
+ int *offset = (int *)alloca(nargs * sizeof (int));
int cum = 0;
int i, alignment;
cum = (cum + alignment) & -alignment;
offset[i] = -cum;
}
- sp += min ((cum + 7) & -8, 16);
+ sp += max ((cum + 7) & -8, 16);
for (i = 0; i < nargs; i++)
write_memory (sp + offset[i], VALUE_CONTENTS (args[i]),
skip_prologue(pc)
CORE_ADDR pc;
{
- int inst;
+ char buf[4];
+ unsigned long inst;
int status;
- status = target_read_memory (pc, (char *)&inst, 4);
- SWAP_TARGET_AND_HOST (&inst, sizeof (inst));
+ status = target_read_memory (pc, buf, 4);
+ inst = extract_unsigned_integer (buf, 4);
if (status != 0)
return pc;
}
void
-_initialize_hppah_tdep ()
+_initialize_hppa_tdep ()
{
add_com ("unwind", class_obscure, unwind_command, "Print unwind info\n");
add_show_from_set
projects / deliverable / binutils-gdb.git / blobdiff