Fri Jan 3 14:20:05 1997 Geoffrey Noer <noer@cygnus.com>
* mn10300-tdep.c (mn10300_push_arguments): rewrote also removed code elsewhere that made use of RP_REGNUM
This commit is contained in:
parent
56f3b62cf5
commit
3de7693865
|
@ -1,3 +1,8 @@
|
|||
Fri Jan 3 14:20:05 1997 Geoffrey Noer <noer@cygnus.com>
|
||||
|
||||
* mn10300-tdep.c (mn10300_push_arguments): rewrote
|
||||
also removed code elsewhere that made use of RP_REGNUM
|
||||
|
||||
Tue Dec 31 15:19:32 1996 Geoffrey Noer <noer@cygnus.com>
|
||||
|
||||
* config/mn10300/tm-mn10300.h: more small register fixes
|
||||
|
|
|
@ -1,5 +1,5 @@
|
|||
/* Target-dependent code for the NEC MN10300 for GDB, the GNU debugger.
|
||||
Copyright 1996, Free Software Foundation, Inc.
|
||||
/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
|
||||
Copyright 1996, 1997 Free Software Foundation, Inc.
|
||||
|
||||
This file is part of GDB.
|
||||
|
||||
|
@ -15,9 +15,7 @@ GNU General Public License for more details.
|
|||
|
||||
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||||
|
||||
/* Contributed by Geoffrey Noer, noer@cygnus.com */
|
||||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||||
|
||||
#include "defs.h"
|
||||
#include "frame.h"
|
||||
|
@ -47,36 +45,259 @@ struct prologue_info
|
|||
struct pifsr *pifsrs;
|
||||
};
|
||||
|
||||
static CORE_ADDR mn10300_scan_prologue PARAMS ((CORE_ADDR pc,
|
||||
struct prologue_info *fs));
|
||||
|
||||
/* Function: scan_prologue
|
||||
Scan the prologue of the function that contains PC, and record what
|
||||
we find in PI. PI->fsr must be zeroed by the called. Returns the
|
||||
pc after the prologue. Note that the addresses saved in pi->fsr
|
||||
are actually just frame relative (negative offsets from the frame
|
||||
pointer). This is because we don't know the actual value of the
|
||||
frame pointer yet. In some circumstances, the frame pointer can't
|
||||
be determined till after we have scanned the prologue. */
|
||||
|
||||
static CORE_ADDR
|
||||
mn10300_scan_prologue (pc, pi)
|
||||
CORE_ADDR pc;
|
||||
struct prologue_info *pi;
|
||||
{
|
||||
CORE_ADDR func_addr, prologue_end, current_pc;
|
||||
struct pifsr *pifsr;
|
||||
int fp_used;
|
||||
|
||||
printf("mn10300_scan_prologue start\n");
|
||||
|
||||
/* First, figure out the bounds of the prologue so that we can limit the
|
||||
search to something reasonable. */
|
||||
|
||||
if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
|
||||
{
|
||||
struct symtab_and_line sal;
|
||||
|
||||
sal = find_pc_line (func_addr, 0);
|
||||
|
||||
if (func_addr == entry_point_address ())
|
||||
pi->start_function = 1;
|
||||
else
|
||||
pi->start_function = 0;
|
||||
|
||||
#if 0
|
||||
if (sal.line == 0)
|
||||
prologue_end = pc;
|
||||
else
|
||||
prologue_end = sal.end;
|
||||
#else
|
||||
prologue_end = pc;
|
||||
#endif
|
||||
}
|
||||
else
|
||||
{ /* We're in the boondocks */
|
||||
func_addr = pc - 100;
|
||||
prologue_end = pc;
|
||||
}
|
||||
|
||||
prologue_end = min (prologue_end, pc);
|
||||
|
||||
/* Now, search the prologue looking for instructions that setup fp, save
|
||||
rp, adjust sp and such. We also record the frame offset of any saved
|
||||
registers. */
|
||||
|
||||
pi->frameoffset = 0;
|
||||
pi->framereg = SP_REGNUM;
|
||||
fp_used = 0;
|
||||
pifsr = pi->pifsrs;
|
||||
|
||||
for (current_pc = func_addr; current_pc < prologue_end; current_pc += 2)
|
||||
{
|
||||
int insn;
|
||||
|
||||
insn = read_memory_unsigned_integer (current_pc, 2);
|
||||
|
||||
if ((insn & 0x07c0) == 0x0780 /* jarl or jr */
|
||||
|| (insn & 0xffe0) == 0x0060 /* jmp */
|
||||
|| (insn & 0x0780) == 0x0580) /* branch */
|
||||
break; /* Ran into end of prologue */
|
||||
if ((insn & 0xffe0) == ((SP_REGNUM << 11) | 0x0240)) /* add <imm>,sp */
|
||||
pi->frameoffset = ((insn & 0x1f) ^ 0x10) - 0x10;
|
||||
else if (insn == ((SP_REGNUM << 11) | 0x0600 | SP_REGNUM)) /* addi <imm>,sp,sp */
|
||||
pi->frameoffset = read_memory_integer (current_pc + 2, 2);
|
||||
else if (insn == ((FP_REGNUM << 11) | 0x0000 | 12)) /* mov r12,fp */
|
||||
{
|
||||
fp_used = 1;
|
||||
pi->framereg = FP_REGNUM;
|
||||
}
|
||||
else if ((insn & 0x07ff) == (0x0760 | SP_REGNUM) /* st.w <reg>,<offset>[sp] */
|
||||
|| (fp_used
|
||||
&& (insn & 0x07ff) == (0x0760 | FP_REGNUM))) /* st.w <reg>,<offset>[fp] */
|
||||
if (pifsr)
|
||||
{
|
||||
pifsr->framereg = insn & 0x1f;
|
||||
pifsr->reg = (insn >> 11) & 0x1f; /* Extract <reg> */
|
||||
|
||||
pifsr->offset = read_memory_integer (current_pc + 2, 2) & ~1;
|
||||
|
||||
pifsr++;
|
||||
}
|
||||
|
||||
if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */
|
||||
current_pc += 2;
|
||||
}
|
||||
|
||||
if (pifsr)
|
||||
pifsr->framereg = 0; /* Tie off last entry */
|
||||
|
||||
printf("mn10300_scan_prologue end \n");
|
||||
|
||||
return current_pc;
|
||||
}
|
||||
|
||||
/* Function: init_extra_frame_info
|
||||
Setup the frame's frame pointer, pc, and frame addresses for saved
|
||||
registers. Most of the work is done in scan_prologue().
|
||||
|
||||
Note that when we are called for the last frame (currently active frame),
|
||||
that fi->pc and fi->frame will already be setup. However, fi->frame will
|
||||
be valid only if this routine uses FP. For previous frames, fi-frame will
|
||||
always be correct (since that is derived from mn10300_frame_chain ()).
|
||||
|
||||
We can be called with the PC in the call dummy under two circumstances.
|
||||
First, during normal backtracing, second, while figuring out the frame
|
||||
pointer just prior to calling the target function (see run_stack_dummy). */
|
||||
|
||||
void
|
||||
mn10300_init_extra_frame_info (fi)
|
||||
struct frame_info *fi;
|
||||
{
|
||||
struct prologue_info pi;
|
||||
struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
|
||||
int reg;
|
||||
|
||||
printf("mn10300_init_extra_frame_info start\n");
|
||||
|
||||
if (fi->next)
|
||||
fi->pc = FRAME_SAVED_PC (fi->next);
|
||||
|
||||
memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
|
||||
|
||||
/* The call dummy doesn't save any registers on the stack, so we can return
|
||||
now. */
|
||||
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
|
||||
return;
|
||||
|
||||
pi.pifsrs = pifsrs;
|
||||
|
||||
mn10300_scan_prologue (fi->pc, &pi);
|
||||
|
||||
if (!fi->next && pi.framereg == SP_REGNUM)
|
||||
fi->frame = read_register (pi.framereg) - pi.frameoffset;
|
||||
|
||||
for (pifsr = pifsrs; pifsr->framereg; pifsr++)
|
||||
{
|
||||
fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
|
||||
|
||||
if (pifsr->framereg == SP_REGNUM)
|
||||
fi->fsr.regs[pifsr->reg] += pi.frameoffset;
|
||||
}
|
||||
|
||||
printf("mn10300_init_extra_frame_info end\n");
|
||||
}
|
||||
|
||||
/* Function: frame_chain
|
||||
Figure out the frame prior to FI. Unfortunately, this involves
|
||||
scanning the prologue of the caller, which will also be done
|
||||
shortly by mn10300_init_extra_frame_info. For the dummy frame, we
|
||||
just return the stack pointer that was in use at the time the
|
||||
function call was made. */
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_frame_chain (fi)
|
||||
struct frame_info *fi;
|
||||
{
|
||||
struct prologue_info pi;
|
||||
CORE_ADDR callers_pc, fp;
|
||||
|
||||
printf("mn10300_frame_chain start\n");
|
||||
|
||||
/* First, find out who called us */
|
||||
callers_pc = FRAME_SAVED_PC (fi);
|
||||
/* If caller is a call-dummy, then our FP bears no relation to his FP! */
|
||||
fp = mn10300_find_callers_reg (fi, FP_REGNUM);
|
||||
if (PC_IN_CALL_DUMMY(callers_pc, fp, fp))
|
||||
return fp; /* caller is call-dummy: return oldest value of FP */
|
||||
|
||||
/* Caller is NOT a call-dummy, so everything else should just work.
|
||||
Even if THIS frame is a call-dummy! */
|
||||
pi.pifsrs = NULL;
|
||||
|
||||
mn10300_scan_prologue (callers_pc, &pi);
|
||||
|
||||
printf("mn10300_frame_chain end\n");
|
||||
|
||||
if (pi.start_function)
|
||||
return 0; /* Don't chain beyond the start function */
|
||||
|
||||
if (pi.framereg == FP_REGNUM)
|
||||
return mn10300_find_callers_reg (fi, pi.framereg);
|
||||
|
||||
return fi->frame - pi.frameoffset;
|
||||
}
|
||||
|
||||
/* Function: find_callers_reg
|
||||
Find REGNUM on the stack. Otherwise, it's in an active register.
|
||||
One thing we might want to do here is to check REGNUM against the
|
||||
clobber mask, and somehow flag it as invalid if it isn't saved on
|
||||
the stack somewhere. This would provide a graceful failure mode
|
||||
when trying to get the value of caller-saves registers for an inner
|
||||
frame. */
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_find_callers_reg (fi, regnum)
|
||||
struct frame_info *fi;
|
||||
int regnum;
|
||||
{
|
||||
printf("mn10300_find_callers_reg\n");
|
||||
|
||||
for (; fi; fi = fi->next)
|
||||
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
|
||||
return generic_read_register_dummy (fi->pc, fi->frame, regnum);
|
||||
else if (fi->fsr.regs[regnum] != 0)
|
||||
return read_memory_unsigned_integer (fi->fsr.regs[regnum],
|
||||
REGISTER_RAW_SIZE(regnum));
|
||||
|
||||
return read_register (regnum);
|
||||
}
|
||||
|
||||
/* Function: skip_prologue
|
||||
Return the address of the first code past the prologue of the function. */
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_skip_prologue (pc)
|
||||
CORE_ADDR pc;
|
||||
{
|
||||
CORE_ADDR func_addr, func_end;
|
||||
|
||||
printf("mn10300_skip_prologue\n");
|
||||
|
||||
/* See what the symbol table says */
|
||||
|
||||
if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
|
||||
{
|
||||
struct symtab_and_line sal;
|
||||
|
||||
sal = find_pc_line (func_addr, 0);
|
||||
|
||||
if (sal.line != 0 && sal.end < func_end)
|
||||
return sal.end;
|
||||
else
|
||||
/* Either there's no line info, or the line after the prologue is after
|
||||
the end of the function. In this case, there probably isn't a
|
||||
prologue. */
|
||||
return pc;
|
||||
}
|
||||
|
||||
/* We can't find the start of this function, so there's nothing we can do. */
|
||||
return pc;
|
||||
}
|
||||
|
||||
/* Function: pop_frame
|
||||
|
@ -87,8 +308,35 @@ void
|
|||
mn10300_pop_frame (frame)
|
||||
struct frame_info *frame;
|
||||
{
|
||||
int regnum;
|
||||
|
||||
printf("mn10300_pop_frame start\n");
|
||||
|
||||
if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
|
||||
generic_pop_dummy_frame ();
|
||||
else
|
||||
{
|
||||
write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
|
||||
|
||||
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
||||
if (frame->fsr.regs[regnum] != 0)
|
||||
write_register (regnum,
|
||||
read_memory_unsigned_integer (frame->fsr.regs[regnum],
|
||||
REGISTER_RAW_SIZE(regnum)));
|
||||
|
||||
write_register (SP_REGNUM, FRAME_FP (frame));
|
||||
}
|
||||
|
||||
flush_cached_frames ();
|
||||
|
||||
printf("mn10300_pop_frame end\n");
|
||||
}
|
||||
|
||||
/* Function: push_arguments
|
||||
Setup arguments for a call to the target. Arguments go in
|
||||
order on the stack.
|
||||
*/
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
|
||||
int nargs;
|
||||
|
@ -97,19 +345,89 @@ mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
|
|||
unsigned char struct_return;
|
||||
CORE_ADDR struct_addr;
|
||||
{
|
||||
int argnum = 0;
|
||||
int len = 0;
|
||||
int stack_offset = 0; /* copy args to this offset onto stack */
|
||||
|
||||
printf("mn10300_push_arguments start\n");
|
||||
|
||||
/* First, just for safety, make sure stack is aligned */
|
||||
sp &= ~3;
|
||||
|
||||
/* Now make space on the stack for the args. */
|
||||
for (argnum = 0; argnum < nargs; argnum++)
|
||||
len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
|
||||
|
||||
sp -= len;
|
||||
|
||||
/* Push all arguments onto the stack. */
|
||||
for (argnum = 0; argnum < nargs; argnum++)
|
||||
{
|
||||
int len;
|
||||
char *val;
|
||||
|
||||
if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
|
||||
&& TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
|
||||
{
|
||||
/* for now, pretend structs aren't special */
|
||||
len = TYPE_LENGTH (VALUE_TYPE (*args));
|
||||
val = (char *)VALUE_CONTENTS (*args);
|
||||
}
|
||||
else
|
||||
{
|
||||
len = TYPE_LENGTH (VALUE_TYPE (*args));
|
||||
val = (char *)VALUE_CONTENTS (*args);
|
||||
}
|
||||
|
||||
while (len > 0)
|
||||
{
|
||||
write_memory (sp + stack_offset, val, 4);
|
||||
|
||||
len -= 4;
|
||||
val += 4;
|
||||
stack_offset += 4;
|
||||
}
|
||||
args++;
|
||||
}
|
||||
|
||||
printf("mn10300_push_arguments end\n");
|
||||
|
||||
return sp;
|
||||
}
|
||||
|
||||
/* Function: push_return_address (pc)
|
||||
Set up the return address for the inferior function call.
|
||||
Needed for targets where we don't actually execute a JSR/BSR instruction */
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_push_return_address (pc, sp)
|
||||
CORE_ADDR pc;
|
||||
CORE_ADDR sp;
|
||||
{
|
||||
printf("mn10300_push_return_address\n");
|
||||
|
||||
/* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
|
||||
return sp;
|
||||
}
|
||||
|
||||
/* Function: frame_saved_pc
|
||||
Find the caller of this frame. We do this by seeing if RP_REGNUM
|
||||
is saved in the stack anywhere, otherwise we get it from the
|
||||
registers. If the inner frame is a dummy frame, return its PC
|
||||
instead of RP, because that's where "caller" of the dummy-frame
|
||||
will be found. */
|
||||
|
||||
CORE_ADDR
|
||||
mn10300_frame_saved_pc (fi)
|
||||
struct frame_info *fi;
|
||||
{
|
||||
printf("mn10300_frame_saved_pc\n");
|
||||
|
||||
/* if (PC_IN_CALL_DUMMY(fi->pc, fi->frame, fi->frame)) */
|
||||
return generic_read_register_dummy(fi->pc, fi->frame, PC_REGNUM);
|
||||
/* else
|
||||
return mn10300_find_callers_reg (fi, RP_REGNUM);
|
||||
*/
|
||||
}
|
||||
|
||||
void
|
||||
|
@ -121,10 +439,19 @@ get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
|
|||
int regnum;
|
||||
enum lval_type *lval;
|
||||
{
|
||||
printf("get_saved_register\n");
|
||||
|
||||
generic_get_saved_register (raw_buffer, optimized, addrp,
|
||||
frame, regnum, lval);
|
||||
}
|
||||
|
||||
/* Function: fix_call_dummy
|
||||
Pokes the callee function's address into the CALL_DUMMY assembly stub.
|
||||
Assumes that the CALL_DUMMY looks like this:
|
||||
jarl <offset24>, r31
|
||||
trap
|
||||
*/
|
||||
|
||||
int
|
||||
mn10300_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
|
||||
char *dummy;
|
||||
|
@ -135,10 +462,26 @@ mn10300_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
|
|||
struct type *type;
|
||||
int gcc_p;
|
||||
{
|
||||
long offset24;
|
||||
|
||||
printf("mn10300_fix_call_dummy start\n");
|
||||
|
||||
offset24 = (long) fun - (long) entry_point_address ();
|
||||
offset24 &= 0x3fffff;
|
||||
offset24 |= 0xff800000; /* jarl <offset24>, r31 */
|
||||
|
||||
store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
|
||||
store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
|
||||
|
||||
printf("mn10300_fix_call_dummy end\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
_initialize_mn10300_tdep ()
|
||||
{
|
||||
printf("_initialize_mn10300_tdep\n");
|
||||
|
||||
tm_print_insn = print_insn_mn10300;
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue