/* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger.
- Copyright 1996, 1997 Free Software Foundation, Inc.
+ Copyright 1996, 1997, 1998 Free Software Foundation, Inc.
This file is part of GDB.
#include "gdbcore.h"
#include "symfile.h"
-/* Info gleaned from scanning a function's prologue. */
+static char *mn10300_generic_register_names[] =
+{ "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3",
+ "sp", "pc", "mdr", "psw", "lir", "lar", "", "",
+ "", "", "", "", "", "", "", "",
+ "", "", "", "", "", "", "", "fp" };
-struct pifsr /* Info about one saved reg */
+char **mn10300_register_names = mn10300_generic_register_names;
+
+static CORE_ADDR mn10300_analyze_prologue PARAMS ((struct frame_info *fi,
+ CORE_ADDR pc));
+
+/* Additional info used by the frame */
+
+struct frame_extra_info
{
- int framereg; /* Frame reg (SP or FP) */
- int offset; /* Offset from framereg */
- int reg; /* Saved register number */
+ int status;
+ int stack_size;
};
-struct prologue_info
+static struct frame_info *analyze_dummy_frame PARAMS ((CORE_ADDR, CORE_ADDR));
+static struct frame_info *
+analyze_dummy_frame (pc, frame)
+ CORE_ADDR pc;
+ CORE_ADDR frame;
{
- int framereg;
- int frameoffset;
- int start_function;
- struct pifsr *pifsrs;
-};
+ static struct frame_info *dummy = NULL;
+ if (dummy == NULL)
+ {
+ dummy = xmalloc (sizeof (struct frame_info));
+ dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS);
+ dummy->extra_info = xmalloc (sizeof (struct frame_extra_info));
+ }
+ dummy->next = NULL;
+ dummy->prev = NULL;
+ dummy->pc = pc;
+ dummy->frame = frame;
+ dummy->extra_info->status = 0;
+ dummy->extra_info->stack_size = 0;
+ memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS);
+ mn10300_analyze_prologue (dummy, 0);
+ return dummy;
+}
-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. */
+/* Values for frame_info.status */
-static CORE_ADDR
-mn10300_scan_prologue (pc, pi)
- CORE_ADDR pc;
- struct prologue_info *pi;
+#define MY_FRAME_IN_SP 0x1
+#define MY_FRAME_IN_FP 0x2
+#define NO_MORE_FRAMES 0x4
+
+
+/* Should call_function allocate stack space for a struct return? */
+int
+mn10300_use_struct_convention (gcc_p, type)
+ int gcc_p;
+ struct type *type;
+{
+ return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+}
+
+/* The breakpoint instruction must be the same size as the smallest
+ instruction in the instruction set.
+
+ The Matsushita mn10x00 processors have single byte instructions
+ so we need a single byte breakpoint. Matsushita hasn't defined
+ one, so we defined it ourselves. */
+
+unsigned char *
+mn10300_breakpoint_from_pc (bp_addr, bp_size)
+ CORE_ADDR *bp_addr;
+ int *bp_size;
{
- CORE_ADDR func_addr, prologue_end, current_pc;
- struct pifsr *pifsr;
- int fp_used;
+ static char breakpoint[] = {0xff};
+ *bp_size = 1;
+ return breakpoint;
+}
- printf("mn10300_scan_prologue start\n");
- /* First, figure out the bounds of the prologue so that we can limit the
- search to something reasonable. */
+/* Fix fi->frame if it's bogus at this point. This is a helper
+ function for mn10300_analyze_prologue. */
- if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
+static void
+fix_frame_pointer (fi, stack_size)
+ struct frame_info *fi;
+ int stack_size;
+{
+ if (fi && fi->next == NULL)
{
- struct symtab_and_line sal;
+ if (fi->extra_info->status & MY_FRAME_IN_SP)
+ fi->frame = read_sp () - stack_size;
+ else if (fi->extra_info->status & MY_FRAME_IN_FP)
+ fi->frame = read_register (A3_REGNUM);
+ }
+}
- sal = find_pc_line (func_addr, 0);
- if (func_addr == entry_point_address ())
- pi->start_function = 1;
- else
- pi->start_function = 0;
+/* Set offsets of registers saved by movm instruction.
+ This is a helper function for mn10300_analyze_prologue. */
-#if 0
- if (sal.line == 0)
- prologue_end = pc;
- else
- prologue_end = sal.end;
-#else
- prologue_end = pc;
-#endif
+static void
+set_movm_offsets (fi, movm_args)
+ struct frame_info *fi;
+ int movm_args;
+{
+ int offset = 0;
+
+ if (fi == NULL || movm_args == 0)
+ return;
+
+ if (movm_args & 0x10)
+ {
+ fi->saved_regs[A3_REGNUM] = fi->frame + offset;
+ offset += 4;
}
- else
- { /* We're in the boondocks */
- func_addr = pc - 100;
- prologue_end = pc;
+ if (movm_args & 0x20)
+ {
+ fi->saved_regs[A2_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (movm_args & 0x40)
+ {
+ fi->saved_regs[D3_REGNUM] = fi->frame + offset;
+ offset += 4;
+ }
+ if (movm_args & 0x80)
+ {
+ fi->saved_regs[D2_REGNUM] = fi->frame + offset;
+ offset += 4;
}
+}
- 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. */
+/* The main purpose of this file is dealing with prologues to extract
+ information about stack frames and saved registers.
- pi->frameoffset = 0;
- pi->framereg = SP_REGNUM;
- fp_used = 0;
- pifsr = pi->pifsrs;
+ For reference here's how prologues look on the mn10300:
- 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> */
+ With frame pointer:
+ movm [d2,d3,a2,a3],sp
+ mov sp,a3
+ add <size>,sp
- pifsr->offset = read_memory_integer (current_pc + 2, 2) & ~1;
+ Without frame pointer:
+ movm [d2,d3,a2,a3],sp (if needed)
+ add <size>,sp
- pifsr++;
- }
+ One day we might keep the stack pointer constant, that won't
+ change the code for prologues, but it will make the frame
+ pointerless case much more common. */
+
+/* Analyze the prologue to determine where registers are saved,
+ the end of the prologue, etc etc. Return the end of the prologue
+ scanned.
- if ((insn & 0x0780) >= 0x0600) /* Four byte instruction? */
- current_pc += 2;
- }
+ We store into FI (if non-null) several tidbits of information:
- if (pifsr)
- pifsr->framereg = 0; /* Tie off last entry */
+ * stack_size -- size of this stack frame. Note that if we stop in
+ certain parts of the prologue/epilogue we may claim the size of the
+ current frame is zero. This happens when the current frame has
+ not been allocated yet or has already been deallocated.
- printf("mn10300_scan_prologue end \n");
+ * fsr -- Addresses of registers saved in the stack by this frame.
- return current_pc;
-}
+ * status -- A (relatively) generic status indicator. It's a bitmask
+ with the following bits:
-/* 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().
+ MY_FRAME_IN_SP: The base of the current frame is actually in
+ the stack pointer. This can happen for frame pointerless
+ functions, or cases where we're stopped in the prologue/epilogue
+ itself. For these cases mn10300_analyze_prologue will need up
+ update fi->frame before returning or analyzing the register
+ save instructions.
- 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 ()).
+ MY_FRAME_IN_FP: The base of the current frame is in the
+ frame pointer register ($a2).
- 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). */
+ NO_MORE_FRAMES: Set this if the current frame is "start" or
+ if the first instruction looks like mov <imm>,sp. This tells
+ frame chain to not bother trying to unwind past this frame. */
-void
-mn10300_init_extra_frame_info (fi)
- struct frame_info *fi;
+static CORE_ADDR
+mn10300_analyze_prologue (fi, pc)
+ struct frame_info *fi;
+ CORE_ADDR pc;
{
- struct prologue_info pi;
- struct pifsr pifsrs[NUM_REGS + 1], *pifsr;
- int reg;
+ CORE_ADDR func_addr, func_end, addr, stop;
+ CORE_ADDR stack_size;
+ int imm_size;
+ unsigned char buf[4];
+ int status, movm_args = 0;
+ char *name;
+
+ /* Use the PC in the frame if it's provided to look up the
+ start of this function. */
+ pc = (fi ? fi->pc : pc);
+
+ /* Find the start of this function. */
+ status = find_pc_partial_function (pc, &name, &func_addr, &func_end);
+
+ /* Do nothing if we couldn't find the start of this function or if we're
+ stopped at the first instruction in the prologue. */
+ if (status == 0)
+ return pc;
+
+ /* If we're in start, then give up. */
+ if (strcmp (name, "start") == 0)
+ {
+ if (fi != NULL)
+ fi->extra_info->status = NO_MORE_FRAMES;
+ return pc;
+ }
- printf("mn10300_init_extra_frame_info start\n");
+ /* At the start of a function our frame is in the stack pointer. */
+ if (fi)
+ fi->extra_info->status = MY_FRAME_IN_SP;
- if (fi->next)
- fi->pc = FRAME_SAVED_PC (fi->next);
+ /* Get the next two bytes into buf, we need two because rets is a two
+ byte insn and the first isn't enough to uniquely identify it. */
+ status = read_memory_nobpt (pc, buf, 2);
+ if (status != 0)
+ return pc;
+
+ /* If we're physically on an "rets" instruction, then our frame has
+ already been deallocated. Note this can also be true for retf
+ and ret if they specify a size of zero.
- memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
+ In this case fi->frame is bogus, we need to fix it. */
+ if (fi && buf[0] == 0xf0 && buf[1] == 0xfc)
+ {
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
- /* 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;
+ /* Similarly if we're stopped on the first insn of a prologue as our
+ frame hasn't been allocated yet. */
+ if (fi && fi->pc == func_addr)
+ {
+ if (fi->next == NULL)
+ fi->frame = read_sp ();
+ return fi->pc;
+ }
- pi.pifsrs = pifsrs;
+ /* Figure out where to stop scanning. */
+ stop = fi ? fi->pc : func_end;
- mn10300_scan_prologue (fi->pc, &pi);
+ /* Don't walk off the end of the function. */
+ stop = stop > func_end ? func_end : stop;
- if (!fi->next && pi.framereg == SP_REGNUM)
- fi->frame = read_register (pi.framereg) - pi.frameoffset;
+ /* Start scanning on the first instruction of this function. */
+ addr = func_addr;
- for (pifsr = pifsrs; pifsr->framereg; pifsr++)
+ /* Suck in two bytes. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
{
- fi->fsr.regs[pifsr->reg] = pifsr->offset + fi->frame;
+ fix_frame_pointer (fi, 0);
+ return addr;
+ }
- if (pifsr->framereg == SP_REGNUM)
- fi->fsr.regs[pifsr->reg] += pi.frameoffset;
+ /* First see if this insn sets the stack pointer; if so, it's something
+ we won't understand, so quit now. */
+ if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0)
+ {
+ if (fi)
+ fi->extra_info->status = NO_MORE_FRAMES;
+ return addr;
}
- printf("mn10300_init_extra_frame_info end\n");
-}
+ /* Now look for movm [regs],sp, which saves the callee saved registers.
-/* 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. */
+ At this time we don't know if fi->frame is valid, so we only note
+ that we encountered a movm instruction. Later, we'll set the entries
+ in fsr.regs as needed. */
+ if (buf[0] == 0xcf)
+ {
+ /* Extract the register list for the movm instruction. */
+ status = read_memory_nobpt (addr + 1, buf, 1);
+ movm_args = *buf;
-CORE_ADDR
-mn10300_frame_chain (fi)
- struct frame_info *fi;
-{
- struct prologue_info pi;
- CORE_ADDR callers_pc, fp;
+ addr += 2;
+
+ /* Quit now if we're beyond the stop point. */
+ if (addr >= stop)
+ {
+ /* Fix fi->frame since it's bogus at this point. */
+ if (fi && fi->next == NULL)
+ fi->frame = read_sp ();
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* Get the next two bytes so the prologue scan can continue. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame since it's bogus at this point. */
+ if (fi && fi->next == NULL)
+ fi->frame = read_sp ();
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+ }
+
+ /* Now see if we set up a frame pointer via "mov sp,a3" */
+ if (buf[0] == 0x3f)
+ {
+ addr += 1;
+
+ /* The frame pointer is now valid. */
+ if (fi)
+ {
+ fi->extra_info->status |= MY_FRAME_IN_FP;
+ fi->extra_info->status &= ~MY_FRAME_IN_SP;
+ }
+
+ /* Quit now if we're beyond the stop point. */
+ if (addr >= stop)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+
+ /* Get two more bytes so scanning can continue. */
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
+ }
+
+ /* Next we should allocate the local frame. No more prologue insns
+ are found after allocating the local frame.
+
+ Search for add imm8,sp (0xf8feXX)
+ or add imm16,sp (0xfafeXXXX)
+ or add imm32,sp (0xfcfeXXXXXXXX).
+
+ If none of the above was found, then this prologue has no
+ additional stack. */
+
+ status = read_memory_nobpt (addr, buf, 2);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
+
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
- printf("mn10300_frame_chain start\n");
+ imm_size = 0;
+ if (buf[0] == 0xf8 && buf[1] == 0xfe)
+ imm_size = 1;
+ else if (buf[0] == 0xfa && buf[1] == 0xfe)
+ imm_size = 2;
+ else if (buf[0] == 0xfc && buf[1] == 0xfe)
+ imm_size = 4;
+
+ if (imm_size != 0)
+ {
+ /* Suck in imm_size more bytes, they'll hold the size of the
+ current frame. */
+ status = read_memory_nobpt (addr + 2, buf, imm_size);
+ if (status != 0)
+ {
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
- /* 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 */
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
- /* Caller is NOT a call-dummy, so everything else should just work.
- Even if THIS frame is a call-dummy! */
- pi.pifsrs = NULL;
+ /* Note the size of the stack in the frame info structure. */
+ stack_size = extract_signed_integer (buf, imm_size);
+ if (fi)
+ fi->extra_info->stack_size = stack_size;
- mn10300_scan_prologue (callers_pc, &pi);
+ /* We just consumed 2 + imm_size bytes. */
+ addr += 2 + imm_size;
- printf("mn10300_frame_chain end\n");
+ /* No more prologue insns follow, so begin preparation to return. */
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, stack_size);
- if (pi.start_function)
- return 0; /* Don't chain beyond the start function */
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
+ }
- if (pi.framereg == FP_REGNUM)
- return mn10300_find_callers_reg (fi, pi.framereg);
+ /* We never found an insn which allocates local stack space, regardless
+ this is the end of the prologue. */
+ /* Fix fi->frame if it's bogus at this point. */
+ fix_frame_pointer (fi, 0);
- return fi->frame - pi.frameoffset;
+ /* Note if/where callee saved registers were saved. */
+ set_movm_offsets (fi, movm_args);
+ return addr;
}
+
+/* Function: frame_chain
+ Figure out and return the caller's frame pointer given current
+ frame_info struct.
-/* 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. */
+ 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? */
CORE_ADDR
-mn10300_find_callers_reg (fi, regnum)
+mn10300_frame_chain (fi)
struct frame_info *fi;
- int regnum;
{
- printf("mn10300_find_callers_reg\n");
+ struct frame_info *dummy;
+ /* Walk through the prologue to determine the stack size,
+ location of saved registers, end of the prologue, etc. */
+ if (fi->extra_info->status == 0)
+ mn10300_analyze_prologue (fi, (CORE_ADDR)0);
- 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));
+ /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */
+ if (fi->extra_info->status & NO_MORE_FRAMES)
+ return 0;
- return read_register (regnum);
-}
+ /* Now that we've analyzed our prologue, determine the frame
+ pointer for our caller.
-/* Function: skip_prologue
- Return the address of the first code past the prologue of the function. */
+ If our caller has a frame pointer, then we need to
+ find the entry value of $a3 to our function.
-CORE_ADDR
-mn10300_skip_prologue (pc)
- CORE_ADDR pc;
-{
- CORE_ADDR func_addr, func_end;
+ If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory
+ location pointed to by fsr.regs[A3_REGNUM].
- printf("mn10300_skip_prologue\n");
+ Else it's still in $a3.
- /* See what the symbol table says */
+ If our caller does not have a frame pointer, then his
+ frame base is fi->frame + -caller's stack size. */
+
+ /* The easiest way to get that info is to analyze our caller's frame.
+ So we set up a dummy frame and call mn10300_analyze_prologue to
+ find stuff for us. */
+ dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame);
- if (find_pc_partial_function (pc, NULL, &func_addr, &func_end))
+ if (dummy->extra_info->status & MY_FRAME_IN_FP)
+ {
+ /* Our caller has a frame pointer. So find the frame in $a3 or
+ in the stack. */
+ if (fi->saved_regs[A3_REGNUM])
+ return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE));
+ else
+ return read_register (A3_REGNUM);
+ }
+ else
{
- struct symtab_and_line sal;
+ int adjust = 0;
- sal = find_pc_line (func_addr, 0);
+ adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 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;
+ /* Our caller does not have a frame pointer. So his frame starts
+ at the base of our frame (fi->frame) + register save space
+ + <his size>. */
+ return fi->frame + adjust + -dummy->extra_info->stack_size;
}
+}
+
+/* Function: skip_prologue
+ Return the address of the first inst past the prologue of the function. */
-/* We can't find the start of this function, so there's nothing we can do. */
- return pc;
+CORE_ADDR
+mn10300_skip_prologue (pc)
+ CORE_ADDR pc;
+{
+ /* We used to check the debug symbols, but that can lose if
+ we have a null prologue. */
+ return mn10300_analyze_prologue (NULL, pc);
}
+
/* Function: pop_frame
This routine gets called when either the user uses the `return'
command, or the call dummy breakpoint gets hit. */
{
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));
+ /* Restore any saved registers. */
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)));
+ if (frame->saved_regs[regnum] != 0)
+ {
+ ULONGEST value;
+
+ value = read_memory_unsigned_integer (frame->saved_regs[regnum],
+ REGISTER_RAW_SIZE (regnum));
+ write_register (regnum, value);
+ }
+ /* Actually cut back the stack. */
write_register (SP_REGNUM, FRAME_FP (frame));
+
+ /* Don't we need to set the PC?!? XXX FIXME. */
}
+ /* Throw away any cached frame information. */
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.
-*/
+ order on the stack. */
CORE_ADDR
mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr)
{
int argnum = 0;
int len = 0;
- int stack_offset = 0; /* copy args to this offset onto stack */
+ int stack_offset = 0;
+ int regsused = struct_return ? 1 : 0;
- printf("mn10300_push_arguments start\n");
-
- /* First, just for safety, make sure stack is aligned */
+ /* This should be a nop, but align the stack just in case something
+ went wrong. Stacks are four byte aligned on the mn10300. */
sp &= ~3;
- /* Now make space on the stack for the args. */
+ /* Now make space on the stack for the args.
+
+ XXX This doesn't appear to handle pass-by-invisible reference
+ arguments. */
for (argnum = 0; argnum < nargs; argnum++)
- len += ((TYPE_LENGTH(VALUE_TYPE(args[argnum])) + 3) & ~3);
+ {
+ int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3;
+
+ while (regsused < 2 && arg_length > 0)
+ {
+ regsused++;
+ arg_length -= 4;
+ }
+ len += arg_length;
+ }
+ /* Allocate stack space. */
sp -= len;
+ regsused = struct_return ? 1 : 0;
/* Push all arguments onto the stack. */
for (argnum = 0; argnum < nargs; argnum++)
{
int len;
char *val;
+ /* XXX Check this. What about UNIONS? */
if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT
&& TYPE_LENGTH (VALUE_TYPE (*args)) > 8)
{
- /* for now, pretend structs aren't special */
+ /* XXX Wrong, we want a pointer to this argument. */
len = TYPE_LENGTH (VALUE_TYPE (*args));
val = (char *)VALUE_CONTENTS (*args);
}
val = (char *)VALUE_CONTENTS (*args);
}
+ while (regsused < 2 && len > 0)
+ {
+ write_register (regsused, extract_unsigned_integer (val, 4));
+ val += 4;
+ len -= 4;
+ regsused++;
+ }
+
while (len > 0)
{
write_memory (sp + stack_offset, val, 4);
-
len -= 4;
val += 4;
stack_offset += 4;
}
+
args++;
}
- printf("mn10300_push_arguments end\n");
-
+ /* Make space for the flushback area. */
+ sp -= 8;
return sp;
}
CORE_ADDR pc;
CORE_ADDR sp;
{
- printf("mn10300_push_return_address\n");
+ unsigned char buf[4];
- /* write_register (RP_REGNUM, CALL_DUMMY_ADDRESS ()); */
+ store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ());
+ write_memory (sp - 4, buf, 4);
+ return sp - 4;
+}
+
+/* Function: store_struct_return (addr,sp)
+ Store the structure value return address for an inferior function
+ call. */
+
+CORE_ADDR
+mn10300_store_struct_return (addr, sp)
+ CORE_ADDR addr;
+ CORE_ADDR sp;
+{
+ /* The structure return address is passed as the first argument. */
+ write_register (0, addr);
return sp;
}
mn10300_frame_saved_pc (fi)
struct frame_info *fi;
{
- printf("mn10300_frame_saved_pc\n");
+ int adjust = 0;
-/* 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);
-*/
+ adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0);
+ adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0);
+
+ return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE));
}
void
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
- */
+/* Function: mn10300_init_extra_frame_info
+ Setup the frame's frame pointer, pc, and frame addresses for saved
+ registers. Most of the work is done in mn10300_analyze_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. mn10300_analyze_prologue will fix fi->frame if
+ it's not valid.
-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;
+ 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;
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
+
+ frame_saved_regs_zalloc (fi);
+ fi->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+
+ fi->extra_info->status = 0;
+ fi->extra_info->stack_size = 0;
- printf("mn10300_fix_call_dummy start\n");
+ mn10300_analyze_prologue (fi, 0);
+}
- offset24 = (long) fun - (long) entry_point_address ();
- offset24 &= 0x3fffff;
- offset24 |= 0xff800000; /* jarl <offset24>, r31 */
+/* Function: mn10300_virtual_frame_pointer
+ Return the register that the function uses for a frame pointer,
+ plus any necessary offset to be applied to the register before
+ any frame pointer offsets. */
- store_unsigned_integer ((unsigned int *)&dummy[2], 2, offset24 & 0xffff);
- store_unsigned_integer ((unsigned int *)&dummy[0], 2, offset24 >> 16);
+void
+mn10300_virtual_frame_pointer (pc, reg, offset)
+ CORE_ADDR pc;
+ long *reg;
+ long *offset;
+{
+ struct frame_info *dummy = analyze_dummy_frame (pc, 0);
+ /* Set up a dummy frame_info, Analyze the prolog and fill in the
+ extra info. */
+ /* Results will tell us which type of frame it uses. */
+ if (dummy->extra_info->status & MY_FRAME_IN_SP)
+ {
+ *reg = SP_REGNUM;
+ *offset = -(dummy->extra_info->stack_size);
+ }
+ else
+ {
+ *reg = A3_REGNUM;
+ *offset = 0;
+ }
+}
+
+/* This can be made more generic later. */
+static void
+set_machine_hook (filename)
+ char *filename;
+{
+ int i;
- printf("mn10300_fix_call_dummy end\n");
+ if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300
+ || bfd_get_mach (exec_bfd) == 0)
+ {
+ mn10300_register_names = mn10300_generic_register_names;
+ }
- return 0;
}
void
_initialize_mn10300_tdep ()
{
- printf("_initialize_mn10300_tdep\n");
+/* printf("_initialize_mn10300_tdep\n"); */
tm_print_insn = print_insn_mn10300;
+
+ specify_exec_file_hook (set_machine_hook);
}
+
projects / thirdparty / binutils-gdb.git / blobdiff