struct pifsr *pifsrs;
};
-static CORE_ADDR mn10300_scan_prologue PARAMS ((CORE_ADDR pc,
- struct prologue_info *fs));
-\f
-/* 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().
+/* Function: frame_chain
+ Figure out and return the caller's frame pointer given current
+ frame_info struct.
- 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 start out knowing the current pc, current sp, current fp.
+ We want to determine the caller's fp and caller's pc. To do this
+ correctly, we have to be able to handle the case where we are in the
+ middle of the prologue which involves scanning the prologue.
- 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). */
+ We don't handle dummy frames yet but we would probably just return the
+ stack pointer that was in use at the time the function call was made?
+*/
-void
-mn10300_init_extra_frame_info (fi)
+CORE_ADDR
+mn10300_frame_chain (fi)
struct frame_info *fi;
{
struct prologue_info pi;
- struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
- int reg;
+ CORE_ADDR callers_pc, callers_fp, curr_sp;
+ CORE_ADDR past_prologue_addr;
+ int past_prologue = 1; /* default to being past prologue */
+ int n_movm_args = 4;
- printf("mn10300_init_extra_frame_info start\n");
+ struct pifsr *pifsr, *pifsr_tmp;
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
-
- memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+ /* current pc is fi->pc */
+ /* current fp is fi->frame */
- /* 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;
+ /* current sp is: */
+ curr_sp = read_register (SP_REGNUM);
- pi.pifsrs = pifsrs;
+/*
+ printf("curr pc = 0x%x ; curr fp = 0x%x ; curr sp = 0x%x\n",
+ fi->pc, fi->frame, curr_sp);
+*/
- mn10300_scan_prologue (fi->pc, &pi);
+ /* first inst after prologue is: */
+ past_prologue_addr = mn10300_skip_prologue (fi->pc);
- if (!fi->next && pi.framereg == SP_REGNUM)
- fi->frame = read_register (pi.framereg) - pi.frameoffset;
+ /* Are we in the prologue? */
+ /* Yes if mn10300_skip_prologue returns an address after the
+ current pc in which case we have to scan prologue */
+ if (fi->pc < mn10300_skip_prologue (fi->pc))
+ past_prologue = 0;
- for (pifsr = pifsrs; pifsr->framereg; pifsr++)
+ /* scan prologue if we're not past it */
+ if (!past_prologue)
{
- fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
-
- if (pifsr->framereg == SP_REGNUM)
- fi->fsr.regs[pifsr->reg] += pi.frameoffset;
+ /* printf("scanning prologue\n"); */
+ /* FIXME -- fill out this case later */
+ return 0x666; /* bogus value */
}
- 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);
+ if (past_prologue) /* if we don't need to scan the prologue */
+ {
+/* printf("we're past the prologue\n"); */
+ callers_pc = fi->frame - REGISTER_SIZE;
+ callers_fp = fi->frame - ((n_movm_args + 1) * REGISTER_SIZE);
+/*
+ printf("callers_pc = 0x%x ; callers_fp = 0x%x\n",
+ callers_pc, callers_fp);
+
+ printf("*callers_pc = 0x%x ; *callers_fp = 0x%x\n",
+ read_memory_integer(callers_pc, REGISTER_SIZE),
+ read_memory_integer(callers_fp, REGISTER_SIZE));
+*/
+ return read_memory_integer(callers_fp, REGISTER_SIZE);
+ }
- return fi->frame - pi.frameoffset;
+ /* we don't get here */
}
/* Function: find_callers_reg
struct frame_info *fi;
int regnum;
{
- printf("mn10300_find_callers_reg\n");
+/* printf("mn10300_find_callers_reg\n"); */
for (; fi; fi = fi->next)
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
}
/* Function: skip_prologue
- Return the address of the first code past the prologue of the function. */
+ Return the address of the first inst past the prologue of the function.
+*/
CORE_ADDR
mn10300_skip_prologue (pc)
{
CORE_ADDR func_addr, func_end;
- printf("mn10300_skip_prologue\n");
+/* printf("mn10300_skip_prologue\n"); */
/* See what the symbol table says */
{
int regnum;
- printf("mn10300_pop_frame start\n");
+/* printf("mn10300_pop_frame start\n"); */
if (PC_IN_CALL_DUMMY(frame->pc, frame->frame, frame->frame))
generic_pop_dummy_frame ();
flush_cached_frames ();
- printf("mn10300_pop_frame end\n");
+/* printf("mn10300_pop_frame end\n"); */
}
/* Function: push_arguments
int len = 0;
int stack_offset = 0; /* copy args to this offset onto stack */
- printf("mn10300_push_arguments start\n");
+/* printf("mn10300_push_arguments start\n"); */
/* First, just for safety, make sure stack is aligned */
sp &= ~3;
args++;
}
- printf("mn10300_push_arguments end\n");
+/* printf"mn10300_push_arguments end\n"); */
return sp;
}
CORE_ADDR pc;
CORE_ADDR sp;
{
- printf("mn10300_push_return_address\n");
+/* printf("mn10300_push_return_address\n"); */
/* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
return sp;
mn10300_frame_saved_pc (fi)
struct frame_info *fi;
{
- printf("mn10300_frame_saved_pc\n");
+/* 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);
-*/
+ return (read_memory_integer(fi->frame - REGISTER_SIZE, REGISTER_SIZE));
}
void
int regnum;
enum lval_type *lval;
{
- printf("get_saved_register\n");
+/* 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
- */
+/* 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 frame_chain().
-int
-mn10300_fix_call_dummy (dummy, sp, fun, nargs, args, type, gcc_p)
- char *dummy;
- CORE_ADDR sp;
- CORE_ADDR fun;
- int nargs;
- value_ptr *args;
- struct type *type;
- int gcc_p;
+ 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 v850_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;
{
- long offset24;
+ struct prologue_info pi;
+ struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
+ int reg;
- printf("mn10300_fix_call_dummy start\n");
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
- offset24 = (long) fun - (long) entry_point_address ();
- offset24 &= 0x3fffff;
- offset24 |= 0xff800000; /* jarl <offset24>, r31 */
+ memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
- store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
- store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
+ /* 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;
+*/
- printf("mn10300_fix_call_dummy end\n");
+ /* v850_scan_prologue (fi->pc, &pi); */
+/*
+ if (!fi->next && pi.framereg == SP_REGNUM)
+ fi->frame = read_register (pi.framereg) - pi.frameoffset;
- return 0;
+ 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("init_extra_frame_info\n"); */
}
void
_initialize_mn10300_tdep ()
{
- printf("_initialize_mn10300_tdep\n");
+/* printf("_initialize_mn10300_tdep\n"); */
tm_print_insn = print_insn_mn10300;
}
+
projects / binutils-gdb.git / commitdiff